Optical head

Details Optical head Optical head

1990-09-25

1992-01-07

Ben, Loha

Optical: systems and elements

Lens

With support

369 4416, 359823, G02B 702

Patent

active

050784714

ABSTRACT:
A position detecting mechanism, adapted to be positioned in a device having an optical head arranged to be movable in tracking direction, for detecting the position of the optical head in the tracking direction. A pair of light transmitting members for transmitting light toward the optical head, reflecting plate, provided on the optical head extending along the tracking direction, for reflecting the light transmitted from the pair of light transmitting members at the edge portions thereof along the tacking direction, and a pair of light receiving members for receiving the light reflected by the reflecting plate and outputting signals corresponding to amounts of light received by the light receiving members are provided. The pair of light transmitting members and the pair of light receiving members are arranged in a row along a predetermined line in parallel to the tracking direction. Therefore, the position of the optical head along the tracking direction is not erroneously detected even when the reflecting plate is moved in the focusing direction.

REFERENCES:
patent: 4799766 (1989-01-01), Estes
patent: 4835646 (1989-05-01), Kurosawa et al.
patent: 4868377 (1989-09-01), Nishikawa
English abstract of Japanese Application No. 62-162,241.
English abstract of Japanese Application No. 63-214,925.

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