Optical pick-up device

Details Optical pick-up device Optical pick-up device

1988-05-19

1989-07-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

048474789

ABSTRACT:
An optical pick-up device includes a light source for irradiating a recording medium to record and/or reproduce information, an objective lens for condensing beams of the light which are reflected or transmitted by the recording medium, an optical member such as a parallel plane plate or a diffraction grating for imposing a diffraction pattern upon the condensed light, and a photo detector for detecting the presence and amount of the patterned light in each of a plurality of regions. The regions on the photo detector correspond to those created by lines curved in accordance with a comatic aberration of the optical member. In particular, the curved lines correspond to the projection of first and second rectilinear lines through the objective lens and the optical member onto the photo detector. The first rectilinear line is parallel to a track on the recording medium, and the second rectilinear is perpendicular to the track.

REFERENCES:
patent: 4625303 (1986-11-01), Shikama
patent: 4742218 (1988-05-01), Nakamura

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