Optical high density data reproducing apparatus using interferen

Details Optical high density data reproducing apparatus using interferen Optical high density data reproducing apparatus using interferen

1991-06-06

1993-05-18

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

052126749

ABSTRACT:
A laser beam emitted from a laser diode 12 is converted to parallel beams through a collimator lens 14. The beams pass through a stop 15, a polarizing beam splitter 16 and a .lambda./4 plate 18. The beams are then converged on an optical disc 22 through an objective lens 20 and diffracted by mark set provided on the disc 22. The diffracted beams reflected by the disc 22 enter the objective lens 20, pass through the .lambda./4 plate 18, are reflected by the polarizing beam splitter 16, and are divided into two parts by a half mirror 24. The reflected part of the beams enters a data reproducing detector 26, and the transmitted part of the beams enters a tracking servo detector 27.

REFERENCES:
patent: 5033040 (1991-07-01), Fujita
patent: 5056080 (1991-10-01), Russell
patent: 5099467 (1992-03-01), Sumihiro et al.
Jul. 1, 1978, vol. 17, No. 13, Applied Optics, pp. 2013-2021 "Position Sensing in Video Disk Readout"; J. J. M. Braat et al.

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