Optical pickup device which generates a focusing correction sign

Details Optical pickup device which generates a focusing correction sign Optical pickup device which generates a focusing correction sign

1991-04-16

1993-03-30

Reinhart, Mark J.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

385 15, H04N 121

Patent

active

051988380

ABSTRACT:
A pickup device comprises a semiconductor substrate, a light source, a pair of grating elements each having a different coupling condition or having a coupling condition which varies over the length thereof so that an incident angle of a signal light varies. The grating elements are disposed on the semiconductor substrate and a pair of light receiving elements are respectively disposed opposite to the two grating elements for receiving two light beams divided by the grating elements. The grating elements, and thus the pickup device, can be simply and easily formed.

REFERENCES:
patent: 4672187 (1987-06-01), Fujita et al.
patent: 4885732 (1989-12-01), Sunagawa et al.
patent: 4937808 (1990-06-01), Shimade et al.
The Transactions of the IEICE, vol. E-73, No. 1, Jan. 1990, "Integration of Detection Optics for Magnetooptical Disk Pickup" Toshiaki Suhara, et al., pp. 110-115.

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