Optical head for recording informations into a record medium and

Details Optical head for recording informations into a record medium and Optical head for recording informations into a record medium and

1987-07-02

1989-12-19

Gonzalez, Frank

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369112, G11B 7135

Patent

active

048887552

ABSTRACT:
An improved optical head comprises such a means as a prism for separating a plurality of light beams deflected from the light path between a plurality of light sources and record medium to pass at least one of the plurality of light beams through one of reflecting planes of the means and to reflect the remaining light beams of the plurality of light beams thereon for the reason why each light axis of the plurality of light beams has a slight slant to others, and the reflecting plane is shaped to have an angle such that the incidence angle of the at least oen of the plurality of light beams is smaller than the critical angle of the means, while the remaining light beams of the plurality of light beams are larger in the incidence angles than the critical angle of the means. The at least one of the plurality of light beams is detected to crrect focusing and tracking errors.

REFERENCES:
patent: 4309108 (1982-01-01), Siebert
patent: 4509830 (1985-04-01), Kato et al.
patent: 4545651 (1985-10-01), Kato et al.
patent: 4766582 (1988-08-01), Ando
Synthetic Collection of Technologies on an Optical Memory/Photomagnetic Memory, Published on Oct. 31, 1983, by Science Forum Co., Ltd.

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