Optical pick-up apparatus with holographic optical element to di

Details Optical pick-up apparatus with holographic optical element to di Optical pick-up apparatus with holographic optical element to di

1994-11-17

1997-07-15

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369112, 369103, G11B 709

Patent

active

056489463

ABSTRACT:
An optical pick-up apparatus for recording and/or reading information on and/or from an optical record medium including a semiconductor substrate, a semiconductor laser arranged on the semiconductor substrate, plurality of photodetectors formed in the surface of the semiconductor substrate, a diffraction gratings dividing a laser beam into main beam and two sub-beams, an objective lens projecting the main and sub-beams onto the record medium and directing these beams reflected by the record medium toward a hologram which diffracts each of the main and sub-beams into .+-.1-order beams which are received by the photodetectors. The apparatus is constructed to satisfy the following conditions:

REFERENCES:
patent: 5049732 (1991-09-01), Nagahama et al.
patent: 5315574 (1994-05-01), Saimi et al.
patent: 5391865 (1995-02-01), Kurata et al.
patent: 5406543 (1995-04-01), Kobayashi et al.
patent: 5446719 (1995-08-01), Yoshida et al.

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