Optical pickup apparatus

Details Optical pickup apparatus Optical pickup apparatus

1994-06-23

1995-06-27

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4423, G11B 7095

Patent

active

054285968

ABSTRACT:
An optical pickup apparatus for recording information signals on an optical recording medium. The apparatus includes a light source radiating a diverging light flux, an object lens on which a light flux radiated from said light source is incident, for converging the light flux on the optical recording medium, a light flux dividing device arranged at a position on a light path between the light source and the object lens at which the light flux remains a diverging light flux, which light flux dividing device divests reflected light flux from the optical recording medium out of the light path, a light detection unit for detecting the reflected light diverted from the light path by the light flux dividing device, and a polarized light dependent light flux separating device arranged at a position on a light path between the light flux dividing device and the light detection device at which the reflected light flux is a converging light flux. In this manner, recording characteristics of information signals may be improved and a simplified structure and a small size of the apparatus may be realized.

REFERENCES:
patent: 4682315 (1987-07-01), Uejima
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4873678 (1989-10-01), Nakamura et al.
patent: 5004900 (1991-04-01), Seya et al.
patent: 5189650 (1993-02-01), Watanabe et al.
patent: 5189651 (1993-02-01), Utsumi
patent: 5189655 (1993-02-01), Ogata et al.
patent: 5272685 (1993-12-01), Ando

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