Outer Diameter 3.98mm Biconcave Lens
A biconcave lens has two concave spherical surfaces and negative focal length, with symmetric equal-radius or asymmetric unequal-radius forms. It diverges/expands beams or corrects spherical aberration, distortion and field curvature from plano-convex/biconvex lenses in ultraminiature optics. The source describes directionally optimized divergence: facing the concave spherical surface toward incident light minimizes aberrations and gives uniform divergence. It cannot form an imaging system alone and must combine with positive elements. A compact 3.98mm diameter offers stable optics. CA is generally ≥3.58mm, stated as over 90% of diameter. A standard ultrafine chamfer <0.1mm×45° prevents chipping/scratching during clamping, ultrasonic cleaning and chip bonding without consuming excess optical-path space. Uses include fiber attenuators, miniature ranging/expansion, minimally invasive medical optics, wearable IR sensing and miniature-spectrometer calibration requiring tight space and beam-control accuracy.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Lens Types | Biconcave Lens |
| Diameter Range | 1.2mm-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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