Automatic exposure device in camera for microfilm

Details Automatic exposure device in camera for microfilm Automatic exposure device in camera for microfilm

1985-12-19

1986-12-30

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2774, G03B 2780

Patent

active

046325409

ABSTRACT:
In recording original images such as manuscripts on microfilm, it is necessary to expose the images at an appropriate amount of light which well corresponds with the original density. According to the present invention, there is provided only one sensor for detecting the density of the original images, making it possible to quickly detect the overall density of the original image. The result of the above photometry permits exposure of a microfilm with an amount of light which makes the lightest portion of the microfilmed images constant in density, thereby to achieve high quality control of microfilming process.

REFERENCES:
patent: 3704947 (1972-12-01), Reimann
patent: 3817617 (1974-06-01), Weinert
patent: 4379632 (1983-04-01), Dedden et al.

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