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Bi-concave glass lenses are manufactured with both surfaces concave. These
lenses have negative focal lengths.
- These lenses diverge collimated incident light and form virtual images,
which are seen through the lens.
- They are often used to expand light or increase focal lengths in existing
systems.
- They are used in laser beam expanders, optical character readers, viewers,
and projection systems.
- Antireflection coatings can be ordered as an
option.
- Minimum Order Quantity (MOQ) ranging from 100 to 1,000 units.
General Specifications:
| Parameter |
Value |
| Default unit |
mm |
| Material |
BK7 |
| Diameter tolerance |
+0, -0.1mm |
| Focal length tolerance |
+/-1% |
| Center thickness tolerance |
+/-0.2mm |
| Centration |
3 arc min |
| Surface quality |
20-10 |
| Flange width |
0.2-0.4mm |
| PN: |
DVP007
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| Description: |
Bi-concave lens, precision grade, D=20, EFL=-20
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| Material: |
BK7
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| EFL: |
-20
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| Diameter: |
20
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| Index: |
1.51872
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| BFL: |
-20.65
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| Tc: |
2
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| Te: |
7.04
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| Radius1: |
-21.085
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| Radius2: |
21.08490625208
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| Volume Price: |
$22.20 (MOQ Range Applies) Request Volume Quote |
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