Shutter apparatus

Details Shutter apparatus Shutter apparatus

1991-03-04

1992-05-05

Fields, Carolyn E.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502011, 354456, H01J 3150

Patent

active

051110369

ABSTRACT:
An apparatus for protecting the image recording media in a tracking camera rom destructive illumination. The apparatus includes a shutter assembly mounted between the lens and the camera and a sensor assembly mounted in juxtaposition with the camera so that a sensor at one end of the tube in the sensor assembly detects destructive illumination before it impinges on the lens. The sensor causes a signal to be passed through circuitry connecting to the shutter assembly, activating a rotary solenoid which moves a blade to an interrupting position between the lens and the camera until no further destructive illumination impinges on the sensor. The shutter blade return to a non-interrupting position when the sensor no longer receives destructive illumination.

REFERENCES:
patent: 2976758 (1961-03-01), Parker
patent: 4960988 (1990-10-01), Simms

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