Deflection plate for optical pick-up device

Details Deflection plate for optical pick-up device Deflection plate for optical pick-up device

1993-09-29

1995-12-12

Gonzalez, Frank

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369103, 369 4412, 359573, 359575, G11B 700, G02B 518

Patent

active

054756707

ABSTRACT:
A deflection plate for deflecting laser beams includes a transparent plate on which two grating areas are formed on the same surface. The first grating area has a plurality of parallel grooves. The second grating area has a plurality of grooves in a predetermined pattern. The depth and/or the duty ratio of the grooves in the first grating area differs from that in the second grating area.

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