Objective lenses for cameras, projectors or photographic enlargers or reducers

1. Scope and Applicability

This PCR applies to factory-gate production of finished, mounted objective-lens assemblies whose intended application is a camera, projector, photographic enlarger, or photographic reducer. It covers fixed- and variable-focal-length products; glass, polymer, and mixed optical-element designs; optical coatings; barrels and optomechanical parts; assembly, alignment, testing, and sales packaging when those activities occur within the reporting organization.

It excludes complete cameras and projectors, image sensors, illumination systems, unmounted general-purpose optical elements, ophthalmic lenses, microscopes and telescope objectives, transport after the factory gate, use, maintenance, and end-of-life. A supplied part or process is represented by an upstream dataset and is not duplicated as foreground production. Product design, prototype development, capital equipment, and buildings are excluded unless the study goal explicitly brings them into scope.

The CPC leaf verifies the product identity but does not determine the manufacturing route. The foreground package shall declare the actual substrate materials, coating system, optomechanical configuration, focusing or aperture mechanisms, electronic content, production geography, technology, reporting period, and packaging state.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.metal-products-machinery-and-equipment.medical-appliances-precision-and-optical-instruments-watches-and-clocks.objective-lenses-for-cameras-projectors-or-photographic-enlargers-or-reducers
classification_refs	CPC 3.0: 48321, exact classification context
covered_products	Finished objective-lens assemblies for cameras, projectors, photographic enlargers, or photographic reducers, including glass, polymer, or mixed optical-element designs
excluded_products	Complete cameras or projectors; unmounted general-purpose optical elements; ophthalmic, microscope, telescope, or instrument objectives outside the stated applications; lens caps, filters, adapters, sensors, and other accessories sold separately
representative_product	A finished, mounted multi-element imaging objective lens, aligned, tested, cleaned, and packed at the factory gate
production_route	Site-declared combination of purchased or in-house glass-lens fabrication, polymer-lens molding, cleaning and coating, optomechanical fabrication, assembly, alignment, testing, and packaging
market_state	Finished objective-lens assembly at the manufacturer factory gate, in the declared sales-packaging state

3. Reference Flow

Field	Value
What	Provide a finished objective-lens assembly that forms or projects an image for the declared camera, projector, photographic enlarger, or photographic reducer application
How much	1 kg of accepted objective-lens assemblies at the manufacturer factory gate
How well	Meets the declared optical, mechanical, interface, cleanliness, and acceptance-test specifications for the represented product family
How long or cycle	One production reporting period; use-life performance is outside this factory-gate reference flow
reference_flow_link	Accepted output assembly_objective_lens from objective_lens_assembly_testing_packaging, normalized by measured net finished-product mass

Field	Value
Reference amount	1 kg
Reference product flow	Objective lenses for cameras, projectors or photographic enlargers or reducers cfef9f14-3271-428b-bebe-47ded2db11d4
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	intended application; product family or model; focal-length range; maximum aperture or f-number; image format or projection format; mount and interface; substrate materials; coating specification; focusing and aperture mechanisms; electronic content; factory-gate packaging state; production geography; technology; reporting period

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass	Reference product and all mass-normalized rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Normalize every foreground amount to 1 kg of accepted, finished objective-lens assemblies; exclude shipping pallets and tertiary transport packaging from the denominator.
electricity_energy	Purchased electricity rows	Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66	MJ	Preserve meter values and conversion records; convert kWh to MJ using 1 kWh = 3.6 MJ and report delivered electricity at the facility boundary.
water_mass	Process-water rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Prefer direct mass measurement; when volume is metered, retain volume, temperature, density source, and the conversion to kg.
batch_mass_balance	Material, intermediate, product, reject, and waste rows	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Use dry mass for solid materials unless the purchased or waste flow is explicitly a solution or slurry; record moisture or solids content for wet wastes.

5. System Boundary

The foreground boundary starts when purchased optical-glass pressing blanks, polymer granulates, coating chemicals, optomechanical stock or purchased components, assembly materials, and packaging components cross into the reporting facility. It ends with accepted, tested, cleaned, and packed objective-lens assemblies at the factory gate. Include all site operations causally required for the represented production route, including utilities, internally recycled loops and their losses, rejects, rework, waste handling to the first off-site treatment or recovery hand-off, and direct elementary emissions when measured or calculable.

Boundary Abstraction

Field	Value
declared_starting_condition	Purchased optical-glass pressing blanks, optical polymer granulates, coating materials, optomechanical stock or components, assembly materials, and packaging components at receipt into the reporting facility
starting_condition_role	Foreground entry condition; upstream production and inbound transport are represented by linked upstream datasets
product_classification_scope	Finished mounted objective-lens assemblies for the applications in CPC 3.0 code 48321; classification does not prescribe material or manufacturing route
recursive_input_rule	A purchased finished objective lens used as a subassembly is recorded once as an external same-category product input and linked to an upstream dataset; do not recursively reproduce its production inside this foreground package
upstream_dataset_requirement	Every purchased material, component, energy carrier, water supply, transport service, and waste-treatment hand-off requires a geographically and technologically representative upstream dataset or an explicit documented gap
disclosure	Declare which optical-element, coating, optomechanical, assembly, testing, and packaging steps are in-house or purchased; identify exclusions, cut-offs, shared utilities, rework loops, treatment routes, and data gaps

rule_id	Applies to	Rule	source_ids
boundary_product_identity	Product inclusion	Include only finished objective-lens assemblies for the stated photographic and projection applications; do not merge the category with complete equipment or general optical elements.	un-cpc-3-0-structure-2025
boundary_route_completeness	Foreground operations	Represent every in-house operation required by the declared route, including glass grinding and polishing, polymer molding, cleaning, coating, optomechanical fabrication, assembly, alignment, testing, and packaging when performed.	nikon-tochigi-lens-process; canon-production-technology
boundary_waste_separation	Waste records	Keep solid glass waste, wastewater, polymer lens rejects, aluminium scrap, and final assembly rejects as separate exchanges; do not combine them as residues.	nikon-lens-environment; epa-optical-fabrication-waste-1991
boundary_upstream_avoidance	Purchased inputs	Link purchased flows to upstream datasets and exclude their production from foreground equipment records to prevent double counting.

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
glass_lens_element_fabrication	Optical-glass lens-element fabrication	conditional	Include when optical-glass pressing blanks are ground, polished, centered, or otherwise finished inside the reporting boundary.	Foreground optical-element production	kg accepted polished optical-glass lens elements
polymer_lens_element_molding	Polymer optical-lens molding	conditional	Include when PMMA, polycarbonate, cyclic olefin copolymer, or another declared optical polymer is molded inside the reporting boundary.	Foreground optical-element production	kg accepted molded polymer lens elements
optical_coating	Optical cleaning and coating	conditional	Include when lens elements are cleaned or coated inside the reporting boundary.	Foreground surface finishing	kg accepted coated optical-lens elements
optomechanical_component_fabrication	Optomechanical component fabrication	conditional	Include when barrels, housings, spacers, focus parts, or aperture parts are machined or molded inside the reporting boundary.	Foreground component production	kg accepted optomechanical components
objective_lens_assembly_testing_packaging	Objective-lens assembly, alignment, testing, and packaging	required	Always include for finished mounted objective-lens production.	Foreground final production	1 kg accepted objective-lens assemblies at factory gate

Process: Optical-glass lens-element fabrication (glass_lens_element_fabrication)

This process converts optical-glass pressing blanks into polished and centered lens elements. Its documented sequence and the separate energy and glass-loss records are supported by nikon-tochigi-lens-process, nist-optical-surfaces-1997, and nikon-lens-environment.

Inputs

Product flows

Optical-glass pressing blanks (glass_optical_glass_blank)

Record purchased pressing blanks that enter in-house optical finishing.

• Selected flow: Optical Glass Pressing Blank a68c2948-174f-4e17-a3ee-f2b289d50d18
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured net mass issued to production, less documented unopened returns
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Cerium-oxide polishing compound (glass_cerium_oxide)

Record cerium oxide only when it is actually issued to the polishing route; other polishing compounds require their own atomic rows.

• Selected flow: Cerium oxide b23ee368-01e2-4fcd-8e8f-e8115ee04555
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured cerium-oxide mass consumed, corrected for returned or internally recovered compound
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Process water for grinding, polishing, and cleaning (glass_process_water)

Record supplied process water that crosses the process boundary; closed-loop recirculation is not counted again, but make-up and purge water are.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured make-up and once-through process-water mass
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Purchased electricity for glass-lens fabrication (glass_electricity)

Record metered delivered electricity for pressing, grinding, polishing, centering, cleaning, extraction, and process support allocated to this process.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200c9a66; Units of energy 93a60a57-a3c8-11da-a746-0800200c9a66; MJ
• Amount rule: measured delivered electricity converted from kWh to MJ
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Polished optical-glass lens elements (glass_polished_lens_element)

Record the accepted internal intermediate after grinding, polishing, centering, and in-process inspection.

• Selected flow: Polished optical-glass lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured accepted intermediate mass transferred to coating or assembly
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Waste flows

Optical-glass grinding fines (glass_waste)

Record captured optical-glass grinding fines leaving the process. Offcuts and rejected elements require their own atomic waste rows. Do not combine this row with wastewater.

• Selected flow: Glass Waste 018da71b-2e3f-41d6-a889-eee14fddf3a1
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured dry mass of captured optical-glass grinding fines leaving the process, net of documented internal reuse
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Optical-glass grinding and polishing wastewater (glass_grinding_polishing_wastewater)

Record the wet waste stream containing water, glass fines, and polishing residues at the first treatment or off-site hand-off; retain measured solids and water fractions.

• Selected flow: Optical-glass grinding and polishing wastewater
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured wet wastewater mass with solids-content record
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_glass_fabrication_records
• Sources:

Elementary flows

Process: Polymer optical-lens molding (polymer_lens_element_molding)

Include only the individual resin cards applicable to the represented product. Plastic optical-part molding is supported by canon-production-technology; unlisted polymers shall be added as their own site-specific atomic exchanges.

Inputs

Product flows

PMMA granulate (polymer_pmma_granulate)

Record PMMA molding granulate when PMMA optical elements are produced.

• Selected flow: Polymethyl methacrylate (PMMA) granulate 9e35bc6c-2239-4305-9c8a-5a2b3d27caf8
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured PMMA granulate issued, net of documented clean regrind returned to the same process
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polymer_molding_records
• Sources:

Polycarbonate granulate (polymer_polycarbonate_granulate)

Record polycarbonate molding granulate when polycarbonate optical elements are produced.

• Selected flow: Polycarbonate granulate f4ad7c9a-3141-4c38-b932-45b7e67e05c6
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured polycarbonate granulate issued, net of documented clean regrind returned to the same process
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polymer_molding_records
• Sources:

Cyclic olefin copolymer resin (polymer_coc_resin)

Record optical-grade cyclic olefin copolymer resin only when that polymer route is used.

• Selected flow: Cyclic olefin copolymer resin
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured cyclic olefin copolymer resin issued, net of documented clean regrind returned to the same process
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polymer_molding_records
• Sources:

Purchased electricity for polymer molding (polymer_electricity)

Record metered delivered electricity for drying, molding, mold-temperature control, inspection, and allocated process support.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66; Units of energy 93a60a57-a3c8-11da-a746-0800200c9a66; MJ
• Amount rule: measured delivered electricity converted from kWh to MJ
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_polymer_molding_records
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Molded polymer optical-lens elements (polymer_molded_lens_element)

Record accepted molded optical elements as an internal intermediate, preserving polymer grade and product specification.

• Selected flow: Molded polymer optical-lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured accepted intermediate mass transferred to coating or assembly
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polymer_molding_records
• Sources:

Waste flows

Rejected molded polymer optical-lens elements (polymer_rejected_lens_element)

Record off-spec molded optical elements leaving the process as waste, with polymer composition and treatment route declared.

• Selected flow: Rejected molded polymer optical-lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured reject mass not returned as clean regrind
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_polymer_molding_records
• Sources:

Elementary flows

Process: Optical cleaning and coating (optical_coating)

This process cleans lens elements, applies the declared coating in vacuum or another documented technology, and inspects coated elements. nikon-tochigi-lens-process and canon-fluorite-lens-process support the sequence; every actual coating substance not listed below requires its own atomic exchange.

Inputs

Product flows

Uncoated optical-glass lens elements (coating_uncoated_glass_lens_element)

Record the internal transfer of accepted uncoated glass elements when the glass route applies.

• Selected flow: Polished optical-glass lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured uncoated glass-element mass entering coating
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_records
• Sources:

Uncoated polymer optical-lens elements (coating_uncoated_polymer_lens_element)

Record the internal transfer of accepted uncoated polymer elements when the polymer route applies.

• Selected flow: Molded polymer optical-lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured uncoated polymer-element mass entering coating
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_records
• Sources:

Magnesium-fluoride coating material (coating_magnesium_fluoride)

Record magnesium fluoride only when the declared coating recipe uses it; other target or precursor chemicals require separate cards.

• Selected flow: Magnesium fluoride 93bc64cc-df82-4a13-aa0f-9f05cb4b40c9
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured virgin target or precursor mass consumed, corrected for recovered material
• Value mode: Foreground record (foreground_record)
• Specificity: Technology-specific (technology_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_records
• Sources:

Purchased electricity for cleaning and coating (coating_electricity)

Record metered delivered electricity for cleaning, drying, vacuum generation, deposition, environmental control, and inspection allocated to this process.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66; Units of energy 93a60a57-a3c8-11da-a746-0800200c9a66; MJ
• Amount rule: measured delivered electricity converted from kWh to MJ
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_coating_records
• Sources:

Process water for optical cleaning (coating_process_water)

Record supplied process water when wet or ultrasonic cleaning uses water before coating or assembly.

• Selected flow: Process Water 94a04f7e-2d5c-41f0-b182-d54a3b373a02
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured make-up and once-through cleaning-water mass
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_records
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Coated optical-lens elements (coating_coated_lens_element)

Record accepted coated elements as an internal intermediate, preserving substrate, layer stack, and inspection specification.

• Selected flow: Coated optical-lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured accepted coated-element mass transferred to assembly
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_coating_records
• Sources:

Waste flows

Elementary flows

Process: Optomechanical component fabrication (optomechanical_component_fabrication)

Include this process when barrels or other optomechanical components are fabricated in-house. The selected alloy row is conditional; add separate atomic rows for every other actual metal or polymer.

Inputs

Product flows

Aluminium-magnesium alloy for machined parts (machining_aluminium_magnesium_alloy)

Record aluminium-magnesium alloy only for product families whose in-house machined components use this alloy.

• Selected flow: Aluminium Magnesium Alloy ab57ae32-8ffe-47fe-9550-53381391a038
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured alloy stock issued to component fabrication, less unopened returns
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_optomechanical_fabrication_records
• Sources:

Purchased electricity for optomechanical fabrication (machining_electricity)

Record metered delivered electricity for machining, molding, cleaning, inspection, extraction, and allocated process support.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66; Units of energy 93a60a57-a3c8-11da-a746-0800200c9a66; MJ
• Amount rule: measured delivered electricity converted from kWh to MJ
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_optomechanical_fabrication_records
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Machined objective-lens barrel (machining_optomechanical_components)

Record the accepted machined objective-lens barrel transferred to assembly. Every other in-house or purchased optomechanical part requires its own atomic inventory row.

• Selected flow: Machined objective-lens barrel
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured accepted machined-barrel mass transferred to assembly
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_optomechanical_fabrication_records
• Sources:

Waste flows

Aluminium scrap from machining (machining_aluminium_scrap)

Record segregated aluminium scrap leaving in-house component fabrication; contaminated sludge requires a separate waste row.

• Selected flow: Aluminium Scrap 96c5f842-ea53-419b-b1cd-c02c479efb45
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured aluminium scrap mass handed to internal recovery or an external receiver
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_optomechanical_fabrication_records
• Sources:

Elementary flows

Process: Objective-lens assembly, alignment, testing, and packaging (objective_lens_assembly_testing_packaging)

This required process receives coated elements and optomechanical parts, performs cleaning, assembly, alignment and functional testing, and packs accepted objective lenses. nikon-tochigi-lens-process supports the manufacturing and inspection sequence.

Inputs

Product flows

Coated optical-lens elements for assembly (assembly_coated_lens_element)

Record coated optical elements entering final assembly, whether internally produced or purchased.

• Selected flow: Coated optical-lens element
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured coated-element mass issued to accepted and rejected assembly lots
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Machined objective-lens barrel for assembly (assembly_optomechanical_components)

Record the individual machined objective-lens barrel entering assembly. Spacers, retaining rings, focus parts, aperture parts, fasteners, and every other optomechanical item require separate atomic rows when present.

• Selected flow: Machined objective-lens barrel
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured or bill-of-materials barrel mass issued to accepted and rejected assembly lots, reconciled with returns
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Epoxy adhesive for optical assembly (assembly_epoxy_adhesive)

Record formulated epoxy adhesive only when used to secure optical or mechanical parts; other adhesive chemistries require separate atomic rows.

• Selected flow: Epoxy adhesive
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured mixed adhesive mass applied plus documented uncured loss
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Purchased electricity for assembly and testing (assembly_electricity)

Record metered delivered electricity for cleaning, assembly, alignment, focus or aperture checks, optical testing, environmental control, and packaging allocated to this process.

• Selected flow: Electricity 67b723a9-6f63-4802-adca-b52ce7967d47
• Flow property / unit: Net calorific value 93a60a56-a3c8-11da-a746-0800200b9a66; Units of energy 93a60a57-a3c8-11da-a746-0800200c9a66; MJ
• Amount rule: measured delivered electricity converted from kWh to MJ
• Value mode: Calculated value (calculated_value)
• Specificity: Site-specific (site_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Corrugated-board shipping boxes (assembly_corrugated_board_boxes)

Record the measured mass of corrugated boxes supplied with the finished product; inserts, bags, foams, manuals, and other packaging components require their own atomic rows.

• Selected flow: corrugated board boxes 4f197bec-7b3b-11dd-ad8b-0800200c9a66
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured corrugated-box mass packed with accepted product
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Waste flows

Elementary flows

Outputs

Product flows

Accepted finished objective-lens assemblies (assembly_objective_lens)

Record only assemblies that pass the declared optical, mechanical, cleanliness, and packaging acceptance criteria.

• Selected flow: Objective lenses for cameras, projectors or photographic enlargers or reducers cfef9f14-3271-428b-bebe-47ded2db11d4
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: accepted net finished-product mass normalized to exactly 1 kg
• Value mode: Calculated value (calculated_value)
• Specificity: Product-specific (product_specific)
• Normalization basis: 1 kg reference product at factory gate
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Calculated from collection (calculated_from_collection)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Waste flows

Rejected mounted objective-lens assemblies (assembly_rejected_objective_lens)

Record final assemblies rejected and leaving the process without complete disassembly; separately recovered glass, metals, or components are recorded as distinct recovery outputs and deducted from this composite waste mass.

• Selected flow: Rejected mounted objective-lens assembly
• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66; Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66; kg
• Amount rule: measured net rejected-assembly mass sent to the declared treatment route
• Value mode: Foreground record (foreground_record)
• Specificity: Product-specific (product_specific)
• Normalization basis: per 1 kg accepted objective-lens assemblies
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_assembly_testing_packaging_records
• Sources:

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_subdivision_first	Shared processes and utilities	Subdivide by product family, route, machine, production cell, or metered area before allocation whenever records permit.
allocation_physical_driver	Residual shared electricity, water, compressed services, and treatment	Allocate residual shared burdens using a documented causal physical driver such as machine time, metered consumption, processed mass, or treatment load; do not use revenue when a causal physical driver is available.
allocation_rework	Rework loops	Assign rework materials, energy, rejects, and losses to the product family that caused the rework; count internal transfers once and disclose repeated processing.
allocation_recovered_material	Glass, polymer, metal, and coating-material recovery	Keep collection, preparation, and transport burdens inside the foreground boundary until the declared recovery hand-off; report any substitution credit or avoided burden only in a separately disclosed scenario.

8. Foreground Data Collection, Calculation, and Quality Rules

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_glass_fabrication_records	glass_lens_element_fabrication	Optical-glass materials, water, electricity, accepted elements, glass waste, and wastewater	Batch issue, meter, production, and waste records	product model; glass grade; blank mass; cerium-oxide issue and return; water meter; electricity meter; accepted element mass; glass-waste mass; wastewater mass; solids content; treatment route	Reconcile material issues, calibrated meters, accepted-output records, and waste transfer tickets by production lot	kg; kWh; MJ	Per lot, with utility aggregation no coarser than monthly	Representative continuous 12-month period or documented campaign	Each reporting facility and applicable production cell	Sum by process and product family, subtract documented internal returns, convert units, then divide by accepted objective-lens mass	Purchase and issue records; meter calibration; lot travelers; inspection results; waste tickets; mass-balance reconciliation
cp_polymer_molding_records	polymer_lens_element_molding	Polymer granulates, electricity, accepted molded elements, and rejects	Batch issue, meter, molding, and reject records	model; polymer grade; virgin granulate mass; regrind return; electricity; accepted element mass; reject mass; treatment route	Reconcile dryer and molding-cell records with material issues and inspected lot output	kg; kWh; MJ	Per molding lot, with utility aggregation no coarser than monthly	Representative continuous 12-month period or documented campaign	Each reporting facility and molding cell	Sum virgin input and unrecovered rejects by polymer and product family, convert electricity, then normalize to accepted objective-lens mass	Resin certificates; issue records; machine logs; meter records; inspection and reject records
cp_coating_records	optical_coating	Lens elements, coating materials, cleaning water, electricity, and accepted coated elements	Coating batch, target issue, meter, cleaning, and inspection records	substrate identity; layer recipe; target or precursor issue and return; lens mass in and accepted out; water; electricity; rejected mass; chamber and batch id	Reconcile coating travelers, target mass change or issue records, meters, and acceptance inspection	kg; kWh; MJ	Per coating batch, with utility aggregation no coarser than monthly	Representative continuous 12-month period or documented campaign	Each reporting facility, cleaning line, and coating chamber	Aggregate only batches with the same declared technology and recipe, then normalize to accepted objective-lens mass	Recipe authorization; target issue or weighing record; calibrated meters; chamber logs; coating inspection
cp_optomechanical_fabrication_records	optomechanical_component_fabrication	Alloy input, electricity, accepted components, and aluminium scrap	Material issue, machine, meter, inspection, and scrap records	product model; alloy grade; stock mass; electricity; accepted component mass; aluminium scrap mass; coolant-contamination status; recovery route	Reconcile stock issues and returns with accepted component and segregated scrap weights	kg; kWh; MJ	Per lot, with utility aggregation no coarser than monthly	Representative continuous 12-month period or documented campaign	Each reporting facility and machining cell	Sum by alloy and component family, convert electricity, then normalize to accepted objective-lens mass	Material certificate; weigh tickets; machine and meter records; inspection results; recycler receipt
cp_assembly_testing_packaging_records	objective_lens_assembly_testing_packaging	Components, adhesive, electricity, packaging, accepted product, and final rejects	Bill of material, batch issue, meter, test, packing, and reject records	model; optical-element mass; component-set mass; adhesive mix and loss; electricity; each packaging-component mass; accepted net product mass; test result; reject mass and route	Reconcile BOM issues with serial or lot acceptance, packing records, and rejected-assembly disposition	kg; kWh; MJ	Per assembly lot, with utility aggregation no coarser than monthly	Representative continuous 12-month period or documented campaign	Each reporting facility and assembly or test line	Sum accepted and rejected lots by product family, convert electricity, and divide every exchange by accepted net finished-product mass	BOM revision; issue records; meter calibration; test reports; serial or lot acceptance; packing specification; waste ticket

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_reference_normalization	Every inventory row	Normalized amount = net exchange amount attributable to the represented product family / accepted net objective-lens mass.	Net row amount; accepted net objective-lens mass	Exchange amount per 1 kg reference product
calc_electricity_conversion	Electricity rows	Delivered electricity in MJ = metered electricity in kWh × 3.6; subtract separately metered export and exclude upstream generation emissions from foreground elementary flows.	Metered kWh; documented export	MJ delivered electricity
calc_water_conversion	Process-water rows	Water mass = metered volume × recorded or justified density at the measurement condition; retain original volume and density evidence.	Water volume; temperature; density	kg process water
calc_material_return	Material input rows	Net material input = issued virgin material + externally supplied recycled material - unopened return - documented same-process internal return already counted in the issue record.	Issue, return, and inventory records	kg net material input
calc_reject_yield	Product and reject rows	Accepted yield = accepted product mass / (accepted product mass + unrecovered reject mass); report separately by product family and route.	Accepted mass; reject mass	Accepted yield and normalized reject mass
calc_mass_balance	Each material-processing process	Reconcile measured material inputs with accepted output, transferred intermediates, wastes, emissions, inventory change, and documented internal return; investigate unexplained imbalance before publication.	Input, output, waste, return, and stock-change records	Process mass-balance residual

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	Reference product	Link records to model or product family and declare all required qualifiers, acceptance specifications, and factory-gate packaging state.	Product specification, BOM revision, routing, and acceptance-test record
dq_route_completeness	Process map	Identify every in-house and purchased step and explain every not-applicable conditional process; add atomic rows for actual materials, packaging components, wastes, and direct emissions not represented by the cards above.	Approved process flow, supplier list, utility map, waste register, and completeness review
dq_measurement	Metered and weighed exchanges	Use calibrated or verified instruments; retain unit conversions, allocation drivers, meter coverage, and estimates used to close data gaps.	Calibration certificates, meter map, weigh records, and calculation workbook
dq_temporal	Foreground data	Prefer a representative continuous 12-month period; for campaigns, document start and end dates, production volume, seasonality, maintenance, and why the campaign represents normal operation.	Reporting-period records and representativeness statement
dq_mass_balance	Material-processing processes	Resolve material-balance discrepancies and prevent double counting of internal intermediates, returned slurry, polymer regrind, rework, and recovered scrap.	Signed reconciliation by process and product family
dq_source_match	Upstream datasets	Match material grade, product state, electricity grid, water supply, geography, technology, and waste-treatment route; disclose proxy datasets.	Dataset-selection log and gap register

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validation_reference_output	Reference flow	assembly_objective_lens shall use UUID cfef9f14-3271-428b-bebe-47ded2db11d4, Mass, kg, and normalize to exactly 1 kg accepted finished product.	un-cpc-3-0-structure-2025
validation_required_process	Process map	objective_lens_assembly_testing_packaging shall be present; each conditional process shall be included or carry a product- and site-specific not-applicable explanation.	nikon-tochigi-lens-process
validation_atomic_inventory	Inventory	Every actual material, electricity supply, water supply, packaging component, waste stream, and direct elementary emission shall be represented by one atomic row with direction, flow type, amount rule, basis, evidence, and UUID or declared unresolved identity.
validation_internal_transfers	Intermediate flows	The mass and identity of each internal lens-element or component transfer shall agree between the supplying and receiving processes; do not count the transfer as a purchased input.
validation_route_materials	Glass, polymer, coating, and optomechanical routes	Include only applicable material cards and add separate rows for every actual unlisted glass, polymer, polishing compound, coating substance, metal, plastic, adhesive, or packaging component.	canon-production-technology; nikon-tochigi-lens-process
validation_waste_routes	Waste outputs	Solid glass waste, wastewater, polymer rejects, aluminium scrap, and composite assembly rejects shall not be merged; state moisture or solids content and the first treatment or recovery hand-off.	nikon-lens-environment; epa-optical-fabrication-waste-1991
validation_electricity_scope	Electricity	Electricity shall be process-attributed, converted consistently to MJ, and shall not cause upstream grid emissions to be repeated as foreground elementary flows.
validation_data_period	Foreground package	Data shall cover the declared period and facilities, identify estimation and allocation shares, and disclose any process whose records do not meet the collection protocol.

10. Published Dataset Profile

Field	Value
dataset_role	secondary_dataset; may serve as background_dataset only after independent methodology and data-quality review
downstream_use	Foreground process datasets and lifecycle-model projections for products using camera, projector, photographic enlarger, or photographic reducer objective lenses
allowed_use	Products matching the declared application, optical performance, material route, coating, optomechanical content, factory-gate state, geography, technology, and reporting period
excluded_use	Complete equipment; unmounted general optical elements; ophthalmic, microscope, telescope, or unrelated instrument objectives; materially different substrate, coating, electronics, or assembly routes without adjustment
required_metadata	PCR id and version; model or product family; required qualifiers; included and purchased processes; facility geography; technology; reporting period; allocation; cut-offs; upstream dataset references; UUID gaps; packaging state
required_quality_disclosure	Primary-data share; meter and mass coverage; allocation shares and drivers; accepted yield and reject treatment; material-balance residuals; data gaps; proxies; uncertainty; review status
update_trigger	Material change in product design, optical substrate, coating recipe, optomechanical or electronic content, supplier structure, process technology, facility, electricity mix, waste route, packaging, allocation, reference UUID, or evidence contract

11. Data Sources

Source id	Type	Reference	Used for
un-cpc-3-0-structure-2025	official_guidance	United Nations Statistics Division, CPC Version 3.0 Structure, 30 June 2025. https://unstats.un.org/unsd/classifications/Econ/Download/In%20Text/CPC_Ver_3.0_Structure_30Jun2025.csv	English classification identity and exact CPC 48321 boundary context
un-cpc-1-1-chinese-2004	official_guidance	United Nations Statistics Division, Central Product Classification Version 1.1, Chinese edition, Series M No. 77/Ver.1.1. https://unstats.un.org/unsd/publication/SeriesM/M_77ver1_1c.pdf	Verified professional Chinese rendering of the unchanged CPC 48321 title
nikon-tochigi-lens-process	handbook	Tochigi Nikon Corporation, NIKKOR lens work process. https://www.jp.nikon.com/company/corporate/group/ktn/businesses/imaging/process/	Independent manufacturer evidence for grinding, precision grinding, polishing, coating, component machining and molding, assembly, and performance checks
nikon-lens-environment	handbook	Nikon Corporation, Reducing CO2 emissions from lens manufacturing process through technology. https://www.nikon.com/company/sustainability/highlight/1803_co2/	Energy materiality, pressed-glass grinding and polishing, glass loss, and reject tracking; case values are not used as PCR ranges
canon-production-technology	handbook	Canon Inc., Production Technology. https://global.canon/en/technology/canon-tech/tech/production-tech/	Plastic molding as a camera-lens optical-part route and precision grinding and polishing of aspherical camera lenses
canon-fluorite-lens-process	handbook	Canon Camera Museum, Fluorite lenses: Corrective capabilities beyond the limits of ordinary optical glass. https://global.canon/en/c-museum/special/exhibition2.html	Trimming, grinding, polishing, high-vacuum coating, interferometric inspection, and assembly hand-off for camera-lens elements
nist-optical-surfaces-1997	official_guidance	T. V. Vorburger, C. J. Evans, and C. Asmail, Calibration and Fabrication Facilities for Optical Surfaces, NIST, 1997. https://www.nist.gov/publications/calibration-and-fabrication-facilities-optical-surfaces	Optical grinding, polishing, surface inspection, and metrology process evidence
epa-optical-fabrication-waste-1991	official_guidance	M. Drabkin and E. Rissmann, Waste Minimization Opportunity Assessment: Optical Fabrication Laboratory, EPA/600/S2-91/031, 1991. https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=30003U24.TXT	Separate glass-fines and washwater records in an older ophthalmic glass-lens facility; used only for waste-stream identification, not amounts or applicability of lead-bearing blocking technology