Optical read-out head capable of improved read-out of media with

Details Optical read-out head capable of improved read-out of media with Optical read-out head capable of improved read-out of media with

1996-08-07

1998-11-17

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369103, G11B 712

Patent

active

058386513

ABSTRACT:
In an optical read-out head used for a multi-value information recording medium, fluctuations in a reproduction signal-to-noise ratio can be greatly reduced to reproduce reflected light with consistent performance. In an optical read-out head, after light emitted from a light source has been focussed by an objective lens, the focussed light is reflected by a multi-value information optical recording medium having a plurality of pit heights, and the reflected light passes through the objective lens, and thereafter, the reflection light is detected by a photodetector. An optical light separating element for separating the incident reflected light into diffracted sub-beams each conveying the information of a different pit height is provided in an optical path of the reflected light defined from the objective lens to the photodetector. A light receiving structure including the photodetector is provided which separately receives the diffracted beams separated by the optical light separating element.

REFERENCES:
patent: 4963464 (1990-10-01), Setani
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patent: 5410529 (1995-04-01), Kurata et al.
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patent: 5526336 (1996-06-01), Park et al.
patent: 5526338 (1996-06-01), Hasman et al.
Marx, David S. et al., "Pit Depth Encoded Memories", pp. 41 and 42.

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