INDUSTRY COMPONENT

Chrome Grating Layer

Chrome grating layer is a precision optical component with micro-patterned chrome lines on a substrate, used for high-resolution position sensing in optical encoders.

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Component Specifications

Definition
The chrome grating layer is a critical component in precision optical encoder grating discs, consisting of a substrate (typically glass or quartz) coated with a thin, precisely patterned layer of chromium. This layer features alternating reflective (chrome) and transparent (substrate) lines at micron-scale pitches, creating a diffraction grating that modulates light for accurate angular or linear position measurement. The pattern is created through photolithography and etching processes to achieve sub-micron accuracy, enabling resolution down to nanometers in high-end encoders.
Working Principle
The chrome grating layer works by diffracting incident light from an LED or laser source. As the grating disc rotates or moves, the alternating chrome lines and transparent gaps create periodic variations in light intensity when detected by photodiodes. These variations are converted into electrical signals that determine position, speed, or direction through interpolation of the sinusoidal waveforms generated by the diffraction pattern.
Materials
Substrate: Borosilicate glass (e.g., Corning 7740) or fused quartz; Coating: Chromium (Cr) layer 80-120 nm thick, often with an adhesion layer of chromium oxide or titanium; Optional anti-reflective coating: Silicon dioxide (SiO2) or magnesium fluoride (MgF2).
Technical Parameters
  • Pitch 2-20 μm
  • Flatness < λ/4 @ 632.8 nm
  • Line Width 1-10 μm
  • Reflectivity > 60% @ 650 nm
  • Surface Quality 40-20 scratch-dig
  • Chrome Thickness 80-120 nm
  • Pattern Accuracy ±0.1 μm
  • Substrate Thickness 0.5-3 mm
Standards
ISO 10110, ISO 14997, DIN 3140, DIN 58196

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Chrome Grating Layer.

chrome grating optical encoder grating chromium pattern diffraction grating position sensor rotary encoder linear encoder photolithography precision measurement Chrome Grating Layer Chrome Grating Layer in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Precision Optical Encoder Grating Disc

High-resolution glass disc with etched radial patterns for angular position sensing

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Engineering Analysis

Risks & Mitigation
  • Pattern damage from abrasive cleaning
  • Delamination due to poor adhesion
  • Signal drift from thermal expansion mismatch
  • Contamination reducing light transmission
  • Electrostatic discharge damaging photodiodes
FMEA Triads
Trigger: Insufficient chrome-substrate adhesion
Failure: Pattern delamination during thermal cycling
Mitigation: Implement proper surface pretreatment (oxygen plasma cleaning) and adhesion layer (CrOx or Ti) before chrome deposition
Trigger: Photolithography mask alignment error
Failure: Pitch inaccuracy causing interpolation errors
Mitigation: Use laser interferometer-controlled mask aligners with < 0.05 μm alignment accuracy and implement statistical process control
Trigger: Substrate thermal expansion mismatch with mounting
Failure: Pattern distortion under temperature variation
Mitigation: Match substrate CTE to mounting materials and use compliant adhesives with controlled cure shrinkage

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Pattern pitch tolerance: ±0.1 μm; Line width uniformity: ±5%; Substrate parallelism: < 5 arcseconds
Test Method
Pattern verification via optical microscopy and laser diffraction; dimensional metrology using white-light interferometry; environmental testing per IEC 60068-2 series

Buyer Feedback

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"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Chrome Grating Layer so far."

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Frequently Asked Questions

What is the typical lifespan of a chrome grating layer in industrial applications?

Properly manufactured chrome grating layers typically last 10+ years in controlled environments, as chromium is highly resistant to oxidation and wear. Lifespan depends on environmental factors like humidity, contaminants, and mechanical stress.

Can chrome grating layers be cleaned if contaminated?

Yes, with extreme care. Use compressed dry air first, then optical-grade solvents like isopropyl alcohol with lint-free wipes. Avoid abrasive cleaners as they can damage the micron-scale patterns.

What causes signal degradation in chrome grating encoders?

Primary causes include contamination on the grating surface, mechanical misalignment, substrate deformation from temperature changes, and chrome layer degradation from aggressive chemicals or prolonged UV exposure.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Ceramic Substrate Clamping Mechanism