G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/00 (2006.01) G11B 27/10 (2006.01)
Patent
CA 1057398
ABSTRACT OF THE DISCLOSURE The present invention relates to light modu- lator stabilization. The prior art has involved record- ing processes in open loop fashion, thereby being subject to random inaccuracies in the level of light intensity modulation. The present invention overcomes this problem by providing an apparatus and method for stabilizing a light modulator. In accordance with the invention, stabilization of the light modulator is effected by control of the average intensity of the modulated laser write beam impinging a metallized video- disc surface. Optical modulation is accomplished by an optical modulator positioned in the path of the laser write beam between a laser source and the metallized videodisc surface. A portion of the laser write beam, after optical modulation, is used to produce an elect- trical feedback signal. The feedback signal control affects stabilizations of the level of modulation of the laser write beam. The optical modulator varies the intensity of the laser write beam from above a pre- determined intensity at which an aperture is formed in the metallized videodisc surface to below the pre- determined intensity at which the beam forms no aperture in the metallized videodisc surface. The modulated laser beam is stabilized at a predetermined average intensity level between the levels above and below the predetermined intensity.
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