Protective apparatus for pick-up tube

Details Protective apparatus for pick-up tube Protective apparatus for pick-up tube

1984-01-20

1984-11-13

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354441, H04N 526, H04N 5197

Patent

active

044829205

ABSTRACT:
A protective apparatus for a pick-up tube of a television camera includes a photo-electric conversion element for detecting the intensity or amount of light incident on the pick-up tube. A shutter or reflector is disposed in the optical or light path from the outside of a housing for the pick-up tube to its target screen and is rotated by a drive device to be capable of preventing an external light from being incident on the target screen of the pick-up tube when the intensity of the external light detected by the photo-electric conversion element exceeds a predetermined value. A control circuit is provided which will operate the drive device to rotate the shutter or reflector to such a state where the external light is prevented from being incident on the target screen of the pick-up tube when the intensity of the external light detected by the photo-electric conversion element exceeds the predetermined value.

REFERENCES:
patent: 2901539 (1959-08-01), Morgan
patent: 3558819 (1971-01-01), Larue
patent: 3586773 (1971-06-01), Niemyer
patent: 3842201 (1974-10-01), Ghaem-Maghami
patent: 4040087 (1977-08-01), Hall
patent: 4202014 (1980-05-01), Gilligan
patent: 4300167 (1981-11-01), Miller

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