Optical head assembly and element holder with positional adjustm

Details Optical head assembly and element holder with positional adjustm Optical head assembly and element holder with positional adjustm

1987-07-31

1988-12-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 369112, G11B 700

Patent

active

047926740

ABSTRACT:
An optical read/write head assembly for a record disk includes a hollow body member 3, 6 mounting an objective lens 1, a prism 16 and a laser 10. An intermediate plate 20 is mounted to the body by a screw 21 extending through an enlarged bore 23 in the plate to enable its positional adjustment in an X-Y plane. A cylindrical holder 8 extends slidably through a further bore 29 in the plate and through an enlarged bore 36 in the body member, and mounts a quadranted photodiode on its inner end. The holder is axially adjustable in the Z axis direction, to thus enable the centering and focusing of a reflected beam on the face of the photodiode.

REFERENCES:
patent: 4498737 (1985-02-01), Doggett
patent: 4644516 (1987-02-01), Mush
patent: 4652095 (1987-03-01), Mauro
patent: 4709139 (1987-11-01), Nakamura et al.

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