Objective lens system for optical recording type disks

Details Objective lens system for optical recording type disks Objective lens system for optical recording type disks

1985-01-18

1988-08-30

Corbin, John K.

350480, G02B 1318, G02B 906

Patent

active

047672021

ABSTRACT:
The present invention provides an objective lens system for optical recording type disks, comprising from a light source side to a disk side; a first lens element having a positive refractive power, said first lens element having at least an aspherical surface; a second lens element having a positive refractive power; and wherein the objective lens system fulfills the following condition:

REFERENCES:
patent: 4002406 (1977-01-01), Sussman
patent: 4525040 (1985-06-01), Nakamura
patent: 4595264 (1986-06-01), Nakamura
patent: 4645311 (1987-02-01), Rothe
Design and Testing of Lenses for Optical Disk Technology by P. Kuttner, Optical Engineering (1983).
Optical Systems for Optical Disk Technology by P. Kuttner, Optical Disk Technology (1982).

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