Objective lens for optical disks

Details Objective lens for optical disks Objective lens for optical disks

1989-05-08

1990-09-04

Arnold, Bruce Y.

G02B 1318

Patent

active

049539590

ABSTRACT:
An objective lens for optical disks comprises a first lens component and a second lens component and, when the distance on an optical axis from an entrance face of the first lens component disposed in a position farthest from an optical disk to the center of gravity of the objective lens is taken as gc, the overall length of the objective lens as .SIGMA. d, and the focal length as f, the following conditions are satisifed and any of surfaces of the lens components is configured as an aspherical surface:

REFERENCES:
patent: 4595264 (1986-06-01), Nakamura
patent: 4613212 (1986-09-01), Norikazu
patent: 4657352 (1987-04-01), Suda et al.
patent: 4767202 (1988-08-01), Hata et al.

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