Optical pickup apparatus and a hologram element used for same

Details Optical pickup apparatus and a hologram element used for same Optical pickup apparatus and a hologram element used for same

1992-12-02

1994-07-19

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369 4412, 359 15, G11B 713

Patent

active

053316215

ABSTRACT:
An optical pickup apparatus including a light emitting source, a hologram element for scanning a recording medium with light beams emitted from the light emitting source, a hologram lens for focusing the light beams introduced from the hologram element on the recording medium, an optical detector for detecting the light beams reflected from the recording medium, and a first optical system for directing the light beams reflected from the recording medium to the optical detector. The hologram element includes an optical diffraction grating for diffracting the light beams emitted from the light emitting source and a control means for controlling the rotation of the hologram element in a swinging manner. The hologram element can have hologram gratings on both surfaces thereof; one of them has a pattern of straight lines and the other has a pattern of concentric circles to obtain a widened deflection angle.

REFERENCES:
patent: 4420829 (1983-12-01), Carlson
patent: 4540247 (1985-09-01), Nishi et al.
patent: 5064258 (1991-11-01), Inokuchi et al.
Patent Abstracts of Japan, vol. 13, No. 135, Apr. 1989 & JP-A-63 303 317 (Sharp Corp.) Dec. 9, 1988 (Abstract).
Patent Abstracts of Japan, vol. 13, No. 472, Oct. 25, 1989 & JP-A-1184 729 (Mitsubishi Electric Corp.) Jul. 24, 1989 (Abstract).
Patent Abstracts of Japan, vol. 11, No. 313, Oct. 13, 1987 & JP-A-62 103 856 (Fujitsu Ltd.) May 14, 1987 (Abstract).
Patent Abstracts of Japan, vol. 14, No. 98, Feb. 22, 1990 & JP-A-13 03 638 (Matsushita Electric Ind Co. Ltd)., Dec. 7, 1989 (Abstract).
Imaging, Part 3, Funado: "A holographic lens system scanner," pp. 28-35 Dec. 20, 1988.

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