Integrated optical pick-up

Details Integrated optical pick-up Integrated optical pick-up

1996-05-24

1997-11-18

Le, Que

Radiant energy

Photocells; circuits and apparatus

Housings

H01J 502

Patent

active

056891083

ABSTRACT:
A light beam generated by a laser diode travels straight through a holographic beam splitter and other optical elements without undergoing any optical modifications up to an information storage disk (disc), and a return beam reflected on the disk (disc) surface is diffracted and divided into two beams by the holographic beam splitter. The divided two beams are reflected by mirrors respectively and irradiate photo-detectors respectively. A monitoring beam is generated at the back of the laser diode, and is reflected by an additional mirror and irradiates an additional photodetector.

REFERENCES:
patent: 5285062 (1994-02-01), Lee
patent: 5374819 (1994-12-01), Kim et al.

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