Meniscus Lens with Outer Diameter 4.99mm
A meniscus lens is an asymmetric element with two spherical surfaces curving in the same direction. Positive/negative versions correct aberrations and optimize compact optical paths; the source states they cannot act alone as imaging lenses. Positive types are thicker centrally, with weak positive power to correct spherical aberration/coma without markedly changing divergence, often combined with plano-convex/biconvex lenses in miniature imaging. Negative types are thicker at the edge, with weak negative power for beam expansion, longer effective paths and distortion suppression in miniature expanders/endoscope relays. A 4.99mm diameter is a miniature precision size with a stated approximately 10% improvement in clamping tolerance. CA is generally ≥4.49mm, stated as over 90% of diameter. A standard chamfer <0.1mm×45° prevents chipping/scratching during clamping, cleaning and assembly. Uses include fiber communications, miniature ranging, endoscopy and 3D-depth lenses requiring compactness and imaging accuracy.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Lens Types | Meniscus Lens |
| Diameter Range | 1.5mm-50mm |
| Outer Diameter Tolerance | +0/-0.01mm |
| Thickness Tolerance (Thickness Deviation) | ±0.01mm |
| Surface Finish | 10/5~80/50 |
| Eccentricity Error | 1'~5’ |
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