Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1977-10-28
1979-07-10
Martin, John C.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358108, 358217, H04N 530, H04N 718
Patent
active
041610008
ABSTRACT:
A conventional television camera is provided with a motor driven, rotating mechanical shutter assembly having a pair of adjustable, opposing shutter openings, and control circuitry for synchronizing the operation of the shutter assembly with the scanning of the camera's pickup tube to limit image movement on the pickup tube during a field scan in order to permit high clarity picture reproduction of scene objects moving rapidly across the camera's field of view. The control circuitry is adapted to receive any of several types of conventional picture synchronizing signals ordinarily employed in television cameras and conditions these synchronizing signals for use in controlling a pair of motor driving amplifiers whose outputs are coupled to the shutter driving motor for selectively energizing the latter. The speed of the motor is therefore synchronized with the picture synchronizing signals, consequently, the angular position of the shutter openings remains synchronized with the scanning of the camera's pickup tube in spite of variations in the source of synchronizing signals, power line frequency or wear characteristics of the motor. An optical sensing circuit coupled with the shutter assembly functions to produce a tachometer signal indicative of the speed and phase position of the shutter openings and is used as a feedback control signal to automatically provide an initial phase adjustment of the motor in order to bring the operation of the shutter assembly into synchronization with the scanning of the camera's pickup tube. Protective circuitry is also provided for switching commercial line power to the motor in the event that the motor driving amplifiers are rendered inoperative, and for removing all energizing power from the motor in the event that the tachometer signal is not produced within a prescribed time interval after start-up of the system.
REFERENCES:
patent: 2455323 (1948-11-01), Townsend
patent: 2774815 (1956-12-01), Gillette
patent: 2874213 (1959-02-01), Beers
patent: 2956117 (1960-10-01), Ernst et al.
patent: 3008001 (1961-11-01), Reith
patent: 3113180 (1963-12-01), Bingley et al.
patent: 3377426 (1968-04-01), Thomas
patent: 3499109 (1970-03-01), Kihara et al.
Martin John C.
Video Systems Research, Inc.
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