Signal sensing device of magneto-optic disk device for detecting

Details Signal sensing device of magneto-optic disk device for detecting Signal sensing device of magneto-optic disk device for detecting

1992-01-09

1994-08-09

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369110, 369112, G11B 700

Patent

active

053373006

ABSTRACT:
A signal sensing device is provided that includes an optical system having a first splitting function by which a beam reflected by a magneto-optic disk is split by a small amount, a second splitting function by which the beam is split into a P-polarized-component and an S-polarized-component, and a third splitting function by which the beam is split into a first optical path and a second optical path. The second splitting function is carried out by an optical element carrying out one of the first and third splitting functions. A first photo sensor is provided with a beam receiving area divided into four parts, and an undivided beam receiving area, and a second photo sensor is provided with a beam receiving area divided into two parts and an undivided beam receiving area. The beam receiving divided area of the first photo sensor receives the P-polarized-component and senses a focusing error signal, and the beam receiving divided area of the second photo sensor receives the S-polarized-component and senses a tracking error signal. The beam receiving undivided areas of the first and second photo sensors are provided for sensing an information record signal.

REFERENCES:
patent: 4773053 (1988-09-01), Gottfried
patent: 4926409 (1990-05-01), Tsuyuguchi et al.
patent: 5033828 (1991-07-01), Haruta
patent: 5070493 (1991-12-01), Marshall et al.
patent: 5150350 (1992-09-01), Aikoh et al.

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