Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1982-09-29
1984-10-16
Hartary, Joseph W.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346160, 358285, 358300, G01D 1514, G11B 700
Patent
active
044778210
ABSTRACT:
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.
REFERENCES:
patent: 4144539 (1979-03-01), Davie et al.
patent: 4201994 (1980-05-01), Hoshito et al.
patent: 4213158 (1980-07-01), De Benedictis
patent: 4307408 (1981-12-01), Kiyohara et al.
Umezu Nobuhiko
Yamamoto Masanobu
Eslinger Lewis H.
Hartary Joseph W.
Preston Gerald E.
Sinderbrand Alvin
Sony Corporation
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