Optical head for use with high density optical disk having multi

Details Optical head for use with high density optical disk having multi Optical head for use with high density optical disk having multi

1996-10-09

1998-05-05

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, 369 4424, G11B 700

Patent

active

057486018

ABSTRACT:
An optical head is provided for use with a high density optical disk having multi-valued data recorded in the optical disk. The optical head includes a pinhole member having three pin-holes in a focal plane of an optical system for supplying a zero-order and a pair of first-order diffracted beams to a photodetector, thereby improving pit-depth detection resolution. The optical head improves resolution in the direction of depth of focus without reducing beam spot diameter.

REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.
"Pit Depth Encoded Memories" Marx et al; Department of Electrical Engineering California Institute of Technology; pp. 41-42; date unknown.

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