Optical head with a translucent plate to split a light beam

Details Optical head with a translucent plate to split a light beam Optical head with a translucent plate to split a light beam

1995-08-02

1997-06-17

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369110, G11B 7125

Patent

active

056403801

ABSTRACT:
Optical-beam 2 emitted from semiconductor laser device 1 is transformed into parallel-light 4 by means of collimator lens 3, and a part of parallel-light 4 passed through parallel glass-plate 7 of which the front-surface is mirror finished and the rear-surface is frost finished is inputted into detector 5 monitoring the light-quantity. The optical-beam reflected from parallel glass-plate 7 is focused on information medium 9 after it passed through a collimator-lens 6. The optical-beam reflected from information medium 9 is then introduced on a detector disposed on the semiconductor laser device taking an reversed course. Since no interference of light transmitted through detector 5 is generated in this optical head, a higher linearity of the output of detector 5 can be obtained so that the better stabilized output control of semiconductor laser device 1 by means of laser control circuit 11 can be obtained.

REFERENCES:
patent: 5095476 (1992-03-01), Greve et al.
patent: 5111448 (1992-05-01), Komma et al.
patent: 5502707 (1996-03-01), Komma et al.
patent: 5515354 (1996-05-01), Miyake et al.
patent: 5519685 (1996-05-01), Kato et al.

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