Optical head apparatus

Details Optical head apparatus Optical head apparatus

1989-04-12

1991-11-19

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4441, 369120, 369 4414, 369 4412, 359 15, G11B 700, G11B 1118

Patent

active

050661388

ABSTRACT:
An optical head apparatus is provided with a holographic element composed of the first grid region which splits the light beam emitted from the light source into a plurality of light beams and the second grid region which diffracts the light beams reflected from the data-recording medium on the same plane, and prevents unnecessary signals from mixing themselves into the reproduction signal by varying at least the diffraction direction or the diffraction angle of the light beams in these grid regions.
The first grid region has an elliptic aperture to make the .+-. primarily condensed spot beams onto the data-recording medium being extended elliptically to the data-recording direction.
The direction of the border of the four photosensitive elements of the photo detector which detects the light beams reflected from the data-recording medium coincides with the direction of the deviation of the condensed spot beams of the reflected light beam, the deviation being caused by the deviation of tracking, the variation of the wave length of the light source and the like.

REFERENCES:
patent: 4829506 (1989-05-01), Bressers et al.
patent: 4885734 (1989-12-01), Yuzo
patent: 4904856 (1990-02-01), Nagahama et al.
patent: 4945529 (1990-07-01), Ono et al.

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