INDUSTRY COMPONENT

Glass Substrate

High-precision glass substrate for optical encoder grating discs, providing dimensional stability and optical clarity for accurate position sensing.

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Component Specifications

Definition
A specialized glass substrate used as the foundational element in precision optical encoder grating discs. This ultra-flat, optically transparent component serves as the carrier for microscopic diffraction gratings that enable high-resolution position and motion detection in industrial automation, robotics, and precision measurement systems. The substrate's thermal stability, surface quality, and dimensional accuracy are critical for maintaining grating pattern integrity and measurement precision.
Working Principle
The glass substrate provides a stable, optically transparent platform for precision-etched diffraction gratings. When light passes through the grating pattern on the substrate, it creates interference patterns that are detected by photodiodes. The substrate's dimensional stability ensures consistent grating spacing, while its optical clarity minimizes light scattering and distortion, enabling accurate position calculation through phase comparison of the interference patterns.
Materials
Borosilicate glass (e.g., Corning 7740/Pyrex) or fused silica/quartz for high-temperature applications. Typical specifications: Coefficient of Thermal Expansion (CTE): 3.25×10⁻⁶/°C (borosilicate), <1×10⁻⁶/°C (fused silica); Surface roughness: Ra < 1 nm; Flatness: λ/10 to λ/20 (at 632.8 nm); Thickness tolerance: ±0.01 mm.
Technical Parameters
  • Diameter 25-300 mm
  • Thickness 0.5-3.0 mm
  • Parallelism < 5 arcseconds
  • Transmission > 92% (400-700 nm)
  • Surface Quality 60-40 scratch-dig
  • Thermal Stability Operating range: -40°C to +150°C
  • Wavefront Distortion < λ/4
Standards
ISO 10110, ISO 14997, DIN 3140, DIN 58750

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Glass Substrate.

optical encoder glass substrate grating disc substrate precision glass component borosilicate encoder substrate fused silica optical component position sensor substrate industrial automation glass Glass Substrate Glass Substrate 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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LCD/TFT Screen

A flat-panel display component that uses liquid crystal technology with thin-film transistor (TFT) active matrix addressing to present visual information.

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LCD Panel

The core display component that produces images in LCD screens

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Engineering Analysis

Risks & Mitigation
  • Surface contamination affecting optical transmission
  • Thermal expansion causing grating pattern distortion
  • Mechanical stress leading to substrate warpage
  • Chemical degradation from cleaning solvents
  • Adhesive failure in mounting applications
FMEA Triads
Trigger: Improper handling during installation
Failure: Surface scratches or micro-cracks
Mitigation: Implement cleanroom handling procedures, use vacuum pick-up tools, provide operator training on glass component handling
Trigger: Thermal cycling beyond design limits
Failure: Grating pattern distortion or delamination
Mitigation: Specify appropriate glass type for operating environment, implement thermal management in encoder design, add temperature sensors for monitoring
Trigger: Incompatible mounting adhesives
Failure: Stress-induced birefringence or substrate fracture
Mitigation: Validate adhesive compatibility through testing, use low-stress mounting techniques, specify adhesive application parameters

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter: ±0.02 mm, Thickness: ±0.01 mm, Flatness: λ/10 at 632.8 nm, Parallelism: < 5 arcseconds
Test Method
Interferometric flatness testing (Fizeau interferometer), surface profilometry (white light interferometer), spectrophotometric transmission measurement, thermal cycling testing per MIL-STD-883

Buyer Feedback

★★★★☆ 4.5 / 5.0 (20 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Glass Substrate meets all ISO standards."

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Glass Substrate arrived with full certification."

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Frequently Asked Questions

What is the difference between borosilicate and fused silica glass substrates for encoder applications?

Borosilicate glass offers excellent thermal stability (CTE ~3.25×10⁻⁶/°C) and cost-effectiveness for most industrial applications. Fused silica provides superior thermal stability (CTE <1×10⁻⁶/°C) and higher temperature resistance for extreme environments, but at higher cost. The choice depends on operating temperature range and precision requirements.

How does substrate flatness affect encoder accuracy?

Substrate flatness directly impacts grating pattern consistency and optical path length. Deviations from perfect flatness cause phase errors in the interference pattern, leading to position measurement inaccuracies. For high-resolution encoders (nanometer scale), λ/20 flatness or better is typically required to maintain sub-micron measurement precision.

What cleaning methods are recommended for glass encoder substrates?

Use particle-free wipes with high-purity isopropyl alcohol (IPA) in cleanroom conditions. Avoid abrasive materials and ultrasonic cleaning unless specifically validated, as they can damage delicate grating patterns. Nitrogen blow-off is recommended for removing loose particles before contact cleaning.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Front Bezel / Housing Granite Base Plate