G - Physics – 11 – B
Patent
G - Physics
11
B
352/31.1
G11B 7/00 (2006.01) G02F 1/11 (2006.01) G06K 15/12 (2006.01) G11B 7/125 (2006.01) H04N 5/76 (2006.01)
Patent
CA 1183948
LIGHT MODULATING APPARATUS ABSTRACT OF THE DISCLOSURE A light modulating apparatus for use with a recording apparatus for recording an information signal on a recording medium includes a light source and an acousto-optic modulator for modulating light emitted from the light source in response to a first electrical signal and thereby producing a modulated light signal for acting on the recording medium. Additionally, the apparatus includes an information signal source for providing an information signal, a high frequency oscillator for producing a carrier signal, a signal modulator for modulating the carrier signal by the information signal and providing therefrom the first electrical signal, and a photo-detector for detecting the modulated light signal and producing in response thereto a second electrical signal. The apparatus further comprises a peak-holding circuit for holding substantially a peak value of the second electrical signal, a comparator for comparing the peak value of the second electrical system with a reference signal and providing a corresponding error signal, and an amplitude modulator for controlling the amplitude of the carrier signal in accordance with the error signal. . .
412435
Umezu Nobuhiko
Yamamoto Masanobu
Gowling Lafleur Henderson Llp
Sony Corporation
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