Apparatus for protecting an image pickup tube in a television ca

Details Apparatus for protecting an image pickup tube in a television ca Apparatus for protecting an image pickup tube in a television ca

1982-03-23

1983-10-18

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

044109156

ABSTRACT:
In a television camera having an image pickup tube and an iris for controlling an amount of incident light upon the pickup tube both in an automatic control mode and in a manual control mode by selectively actualing a mode selection switch, an additional switch is connected in parallel with the mode selection switch and when a main power switch is made off, said additional switch is closed for a given time period during which the iris is driven into its minimum aperture state.

REFERENCES:
patent: 2417506 (1947-03-01), Lamb

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