Focusing Lens Design
A collimating lens converts light from each point in the source-described aperture bar into a parallel beam. Lens choice depends on aberration requirements. Modest requirements permit plano-convex or biconvex singlets and larger relative apertures; stricter requirements use cemented doublets with smaller apertures. In grating systems with coarse gratings and small gaps, aberration has little effect on moiré fringes, so a plano-convex singlet with its flat face toward the filament reduces spherical aberration. At larger gaps, reducing aberration, particularly chromatic aberration, improves fringe contrast. Two plano-convex elements with the first flat faces toward the filament, or aberration-corrected cemented doublets, are preferred. Lens aberration is secondary to filament divergence. Maximum relative apertures are 0.8 for plano-convex singlets, 0.5 for biconvex singlets, and 1 for paired plano-convex lenses, reduced further at large gaps. Shorter focal lengths generally make readheads compact and increase silicon photocell illumination, reducing lamp power and heat for stability. However, they increase aberration, filament divergence, and illumination nonuniformity within the aperture. Figure: 1, spherical collimating lens; 2, aspheric collimating lens.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Housing Material | Copper, Aluminum (Blackened) |
| Optic Material | D-LAK6、L-BAL35、H-K9L、D-ZK3、LBAL42 |
| Dimensions | M6, M7, M8, M9, M10 (Customizable as Required) |
| Type | Single-Element, Two-Element, Three-Element, Single Rubber Ring, Double Rubber Ring |
| Wavelength | 450nm、520nm、530nm、633nm、635nm、650nm、655nm、780nm、850nm、400-700nm |
| Coating | 400-700nm、630-680nm、400-700nm、700-1100nm、420-680nm、786nm、510nm-550nm、420-660nm、405-450nm |
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