Structured Manufacturing Data (2026)

Optical Filter

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Optical Filter used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Optical Filter is characterized by the integration of Filter Substrate and Dielectric Coating Layers. In industrial production environments, manufacturers listed on CNFX commonly emphasize Optical Glass (e.g., BK7, Fused Silica) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A component that selectively transmits or blocks specific wavelengths of light within an optical sensor system.

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Product Specifications

Technical details and manufacturing context for Optical Filter

Definition
An optical filter is a critical component within an Optical Sensor Module that modifies the spectral characteristics of incoming light. It functions by selectively transmitting, reflecting, or absorbing specific wavelengths (e.g., infrared, ultraviolet, or a narrow band of visible light) to ensure only the desired light reaches the sensor's photodetector. This enhances signal-to-noise ratio, improves measurement accuracy, and protects sensitive sensor elements from harmful or irrelevant radiation.
Working Principle
Optical filters operate based on principles of interference, absorption, or dichroism. Interference filters use thin-film coatings to reflect unwanted wavelengths while transmitting the target band. Absorption filters contain dyes or materials that absorb specific wavelengths. The filter is precisely positioned in the optical path of the sensor module to condition the light before it strikes the sensing element.
Common Materials
Optical Glass (e.g., BK7, Fused Silica), Thin-Film Dielectric Coatings, Optical Adhesives
Technical Parameters
  • Center Wavelength (CWL) and Bandwidth (FWHM) defining the transmitted spectral range. (nm) Per Request
Components / BOM
  • Filter Substrate Part
    Provides the base optical material (e.g., glass) that supports the filtering coatings and maintains mechanical integrity.
    Material: Optical Glass (BK7, Fused Silica) or Optical Plastic
  • Dielectric Coating Layers Part
    Multiple thin-film layers deposited on the substrate that create the interference effects for precise wavelength selection and blocking.
    Material: Dielectric Oxides (e.g., SiO2, TiO2, Ta2O5)
  • Protective Coating Part
    An outer layer (often hard coating) applied to shield the delicate dielectric layers from environmental damage, scratches, and moisture.
    Material: SiO2 or other durable dielectric material
  • Mounting Ring/Frame Part
    A mechanical housing (if present) that secures the filter in the correct position and orientation within the sensor module assembly.
    Material: Aluminum, Stainless Steel, or Plastic

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Optical Filter.

Spectral Filter Light Filter optical filter for sensor systems dielectric coating optical filter BK7 glass optical filter wavelength selective optical component thin-film optical filter manufacturing

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Optical Sensor Module
View system integration details
Infrared Sensor
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 2 bar absolute
temperature: -40°C to +85°C
wavelength range: 200 nm to 2000 nm
Media Compatibility
✓ Clean dry air ✓ Non-corrosive gases ✓ Optical-grade liquids (e.g., deionized water)
Unsuitable: Abrasive slurry or particulate-laden environments
Sizing Data Required
  • Target wavelength(s) and bandwidth
  • Required optical density (OD) or transmission percentage
  • Beam diameter and incident angle

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Optical coating degradation
Cause: Environmental exposure to UV radiation, moisture, or chemical contaminants leading to delamination, discoloration, or reduced transmission efficiency
Substrate microfracture
Cause: Thermal cycling stress or mechanical shock during handling/installation causing stress concentration and crack propagation in glass or crystalline materials
Maintenance Indicators
  • Visible discoloration, haze, or cloudiness in previously clear optical surfaces
  • Abnormal spectral output or transmission measurements deviating from baseline specifications by >5%
Engineering Tips
  • Implement controlled environment storage with stable temperature/humidity and UV protection when not in active use
  • Establish regular optical performance monitoring using calibrated spectrophotometers to detect early degradation trends

Compliance & Manufacturing Standards

Reference Standards
ISO 10110-5:2015 (Optics and photonics - Preparation of drawings for optical elements and systems - Part 5: Surface form tolerances) ANSI Z80.3-2018 (Nonprescription Sunglass and Fashion Eyewear Requirements) DIN 58196-2:2019-08 (Optical filters - Part 2: Test methods for spectral characteristics)
Manufacturing Precision
  • Center thickness: +/-0.05 mm
  • Surface flatness: λ/4 at 632.8 nm (He-Ne laser wavelength)
Quality Inspection
  • Spectral transmittance/reflectance measurement (using spectrophotometer)
  • Surface quality inspection per ISO 10110-7 (scratch-dig standards)

Factories Producing Optical Filter

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the main applications of optical filters in electronic manufacturing?

Optical filters are critical in sensor systems for cameras, medical devices, and industrial automation, where they isolate specific wavelengths to enhance signal accuracy and reduce noise.

How do dielectric coatings improve optical filter performance?

Dielectric coatings are applied in precise layers to create interference effects that selectively transmit or block target wavelengths while maintaining durability and thermal stability.

What factors determine the choice between BK7 and fused silica substrates?

BK7 offers excellent optical clarity and cost-effectiveness for visible light applications, while fused silica provides superior UV transmission and thermal resistance for demanding environments.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Computer, Electronic and Optical Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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