Description
Chrome Coated Precision Slit Plate
The chrome coated precision slit plate is a high-accuracy optical component designed for applications that require precisely defined apertures, stable geometric patterns, and controlled light transmission. Manufactured from B270i optical glass, this slit plate combines precision photolithographic patterning with a chrome-coated surface and double-sided anti-reflection coating.
With pattern accuracy down to 2 µm, the component is suitable for LED pattern projectors, optical imaging systems, scientific instruments, and other applications where accurate light shaping and repeatable optical performance are important.
Key Features
The chrome coated precision slit plate is manufactured using precision photolithographic processing to create fine and repeatable slit geometries. The chrome layer provides controlled light blocking in the patterned area, while the transparent glass substrate allows light to pass through the designed apertures.
Key features include:
- Photolithographically engraved patterns with precision down to 2 µm
- B270i optical glass substrate
- Chrome coating for controlled light blocking
- No pinholes specified in the chrome coating
- Surface quality of 20-10 in the pattern area
- Surface quality of 40-20 in the outer area
- Parallelism below 30 arc seconds
- Custom slit geometries available according to application requirements
- Double-sided AR coating for improved optical transmission
- Suitable for standard and customized optical assemblies
The combination of precise pattern geometry and controlled optical transmission makes this optical slit plate suitable for systems where even small dimensional deviations can affect the projected image or light distribution.
Optical Glass and Coating
The substrate material for this product is B270i optical glass, selected for its optical performance, surface quality, and suitability for precision optical processing. B270 glass is known for its good visible-light transmission and stable optical properties. SCHOTT’s published technical data provides detailed information on the optical, mechanical, and thermal characteristics of B270 glass.
For this application, one surface is chrome coated while both surfaces receive AR coating. The chrome coating provides a controlled opaque region for forming the required slit or geometric pattern. The specified chrome coating transmission is below 0.5% from 420–680 nm, while the double-sided AR coating provides transmission above 99% from 600–650 nm according to the product specification.
This coating configuration can help reduce unwanted reflections from the transparent areas while maintaining high transmission in the operating wavelength range.
Precision Manufacturing
Manufacturing a precision slit plate requires accurate control of the glass substrate, surface condition, pattern geometry, coating process, and final inspection.
Jiujon Optics uses precision optical processing and photolithographic patterning to produce customized slit geometries. Depending on the application, the slit dimensions, pattern arrangement, substrate thickness, coating area, and optical performance can be specified according to the customer’s optical design.
The pattern area is specified with a surface quality of 20-10, while the outer area is specified at 40-20. Parallelism is controlled to below 30″, helping maintain the required geometric relationship between the optical surfaces.
The chrome coating is also inspected for coating defects, with no pinholes in the chrome coating specified for this product. These manufacturing controls are important for projection and imaging systems where coating defects or geometric deviations may become visible in the final projected pattern.
Applications
Typical applications include:
- LED pattern projectors
- Optical imaging systems
- Light-shaping systems
- Precision beam-patterning equipment
- Scientific and analytical instruments
- Optical calibration systems
- Industrial optical instruments
- Customized projection modules
For LED pattern projectors, the slit plate can be used as a patterned optical element to control the shape and distribution of transmitted light. The accuracy of the photolithographic pattern helps maintain consistent optical output between components.
For scientific and industrial instruments, customized slit geometries can be developed to match the optical path and mechanical interface of the customer’s system.
Custom Precision Slit Plate Manufacturing
Optical systems often require slit plates with dimensions and patterns that are not available as standard components. Jiujon Optics supports customized designs based on customer drawings, optical specifications, and application requirements.
Customization can include:
- Slit width and length
- Pattern geometry
- Pattern arrangement
- Glass substrate material
- Substrate thickness
- Chrome coating area
- AR coating wavelength range
- Surface quality
- Parallelism
- Overall dimensions and tolerances
Before production, the optical pattern and technical requirements can be reviewed to determine the appropriate manufacturing process and inspection method.
This approach allows the precision slit plate to be integrated directly into an existing optical assembly rather than requiring the customer to modify the original system.
Specifications
| Parameter | Specification |
|---|---|
| Product Type | Chrome Coated Precision Slit Plate |
| Substrate | B270i |
| Pattern Precision | 2 µm |
| Surface Quality – Pattern Area | 20-10 |
| Surface Quality – Outer Area | 40-20 |
| Chrome Coating | One surface |
| Chrome Coating Transmission | T < 0.5% @ 420–680 nm |
| AR Coating | Double-sided |
| AR Transmission | T > 99% @ 600–650 nm |
| Parallelism | < 30″ |
| Chamfer | < 0.3 × 45° |
| Chrome Coating Pinholes | None specified |
| Typical Application | LED Pattern Projectors |
Why Choose Jiujon Optics?
Jiujon Optics manufactures customized optical components including precision reticles, optical slits, filters, windows, lenses, mirrors, and prisms. Our optical manufacturing capabilities cover precision surface processing, coating, photolithographic patterning, inspection, and customized production.
For projects requiring a chrome coated precision slit plate, customers can provide drawings, optical specifications, sample parts, or application requirements for technical evaluation.
Our production and inspection equipment includes spectrophotometers, interferometers, surface processing equipment, coating equipment, and other optical inspection systems. These capabilities support dimensional, surface, coating, and optical performance requirements during production.
If you are developing an LED pattern projector, imaging module, scientific instrument, or other optical system requiring a customized slit plate, contact Jiujon Optics with your drawing or specifications for a technical review and quotation.
