Claims
- 1. A plate microlens comprising gradient index lenses formed integrally in a transparent base, each of said gradient index lenses having an optical axis along a normal to a surface of said transparent base and each having a refractive index profile gradually changing along a direction of the optical axis and along a direction perpendicular thereto, each of said gradient index lenses having a ratio d/a of 0.5 to 0.69, where d is the thickness of the gradient index lens along the optical axis and 2a is the diameter of the gradient index lens along said surface of said transparent base, and each gradient index lens having an effective numerical aperture of at least 0.1, said base consisting essentially of a glass having the following composition: SiO.sub.2 of 45 to 80 mol %, an oxide of an alkali metal of 8 to 35 mol %, ZnO of 2 to 20mol %, B.sub.2 O.sub.3 of 0 to 8 mol %, Al.sub.2 O.sub.3 of 0 to 7 mol %, ZrO.sub.2 of 0 to 2 mol %, and CaO =BaO=MgO of 0 to 10 mol %.
Priority Claims (2)
Number |
Date |
Country |
Kind |
60-43530 |
Mar 1985 |
JPX |
|
60-125896 |
Jun 1985 |
JPX |
|
Parent Case Info
This is a continuation of co-pending application Ser. No. 119,249 filed on Nov. 2, 1987, which is a continuation of Ser. No. 836,339 filed Mar. 5, 1986, both of which are now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (5)
Number |
Date |
Country |
214838 |
Oct 1984 |
DEX |
3329571 |
Feb 1985 |
DEX |
58-167438 |
Oct 1983 |
JPX |
59-140401 |
Aug 1984 |
JPX |
1417806 |
Dec 1975 |
GBX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
119249 |
Nov 1987 |
|
Parent |
836339 |
Mar 1986 |
|