Outer Diameter 6.47mm 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 parallel beams, expands beams or compensates spherical aberration/coma from convex lenses. Isotropic divergence produces a divergent virtual image from parallel input. It cannot be used alone for imaging and must combine with positive elements such as convex or meniscus lenses. A 6.47mm diameter is a small-to-medium precision size with better clamping stability than miniature sizes below 6mm. CA is generally ≥5.82mm, stated as over 90% of diameter. A standard chamfer <0.15mm×45° prevents chipping/scratching during clamping, cleaning and assembly. Uses include industrial machine-vision lenses, miniature beam expanders, medical endoscope paths and 3D scanning requiring compactness and precise beam control.
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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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