Dual mode all - light level television camera

Details Dual mode all - light level television camera Dual mode all - light level television camera

1988-12-22

1990-06-19

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

250213VT, 358228, H01J 3150

Patent

active

049358170

ABSTRACT:
An apparatus for automatically controlling the photocathode of an image intensifier employed as a high speed shutter in a television camera utilizes the video signals established by the camera to provide first and second pulses representative of the light level at the camera. The lengths of these pulses are compared to time intervals representative of light levels whereat switching is provided that selects between the first pulse control of the photocathode and control of the photocathode by a train of pulses gated within the time interval of the second pulse.

REFERENCES:
patent: 3691302 (1972-09-01), Gaebele et al.
patent: 3947119 (1976-03-01), Bamberg et al.
patent: 3974331 (1976-08-01), Pepin
patent: 4025955 (1977-05-01), Grallien et al.
patent: 4071752 (1978-01-01), Manning
patent: 4141043 (1979-02-01), Liu
patent: 4796090 (1989-01-01), Fraier

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