Automatic exposure system for pass through microfilm cameras

Details Automatic exposure system for pass through microfilm cameras Automatic exposure system for pass through microfilm cameras

G - Physics

03

B

95/44

G03B 27/74 (2006.01) G03B 27/72 (2006.01) G03B 27/80 (2006.01)

Patent

CA 1118623

ABSTRACT OF THE DISCLOSURE An automatic exposure system for pass through micro- film cameras is disclosed. The original copies are scanned photo- electrically for generating a reflectance reference signal. A rotary shutter is employed for attenuating the light beam illuminating the original copy to be filmed by tilting into the path of the beam. An angular detector is coupled with the rotary shutter for determining its momentary angular position and for generating a corresponding signal. A comparison means compares the signal from the shutter ? signal based on the reference signal for producing a correction signal to drive a motor connected to the axis of the rotary shutter.

313744

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