Optically recorded data reading apparatus with inclination contr

Details Optically recorded data reading apparatus with inclination contr Optically recorded data reading apparatus with inclination contr

1985-01-23

1987-01-13

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 46, G01J 120, G11B 509

Patent

active

046366288

ABSTRACT:
An apparatus for reading optically recorded data from a disk in which diffracted light beams, which otherwise would be applied to light-detecting elements and which are of higher order than the positive and negative first-order diffracted light beams, are eliminated and only a zeroth-order diffracted light beam is applied to the light-detecting elements. Thereby, a tilt control signal is produced whereby a tilt servo operation can be carried out with a high accuracy. Several different structural arrangements are disclosed for achieving the desired blocking of the higher-than-zeroth-order diffracted light beams.

REFERENCES:
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4547663 (1985-10-01), Kitagishi et al.
patent: 4589103 (1986-05-01), Tajima
IBM Technical Disclosure Bulletin "Field Disturbance Sensing Unit"; vol. 18, No. 7, Dec. 1975, pp. 2275-2276.

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