Optical information reading and writing device with diffraction

Details Optical information reading and writing device with diffraction Optical information reading and writing device with diffraction

1989-12-21

1991-05-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250237R, 369 4423, G01J 120

Patent

active

050158350

ABSTRACT:
An optical information reading and writing device comprising a laser source which emits a laser beam for irradiating an optical recording disk to record an information therein and an optical signal detection system which receives a reflection beam reflected from the disk surface and controls position of the disk. The optical signal detection system comprises a condenser lens for converging the reflection beam and a dual grating element which has linear diffraction gratings formed on its both side surfaces. The incident side grating divides the reflection beam to two beams, one being a beam which is diffracted by the grating and the other being a beam which passes substantially straight through the grating without being diffracted thereby. The optical signal detection system further comprises a pair of three-segment light receiving detector elements for detecting the divided two beams. The two detector elements are disposed on a same plane.

REFERENCES:
patent: 4425636 (1984-01-01), Musha et al.
patent: 4525625 (1985-06-01), Abe
patent: 4672187 (1987-06-01), Fujita et al.
patent: 4689481 (1987-08-01), Ono
patent: 4742218 (1988-05-01), Nakamura et al.
patent: 4850673 (1989-07-01), Velzel et al.
patent: 4858215 (1989-08-01), Yano et al.
patent: 4935911 (1990-06-01), Ohuchida et al.
patent: 4945527 (1990-07-01), Sunagawa

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