Exposure control system for a fixed aperture camera

Details Exposure control system for a fixed aperture camera Exposure control system for a fixed aperture camera

1989-08-28

1990-11-20

Hix, L. T.

Photocopying

Including fiber optics

355 50, 355 71, G03B 2700, G03B 2772

Patent

active

049722247

ABSTRACT:
A fixed aperture, compact camera for photographically copying a selected portion of an illuminated image is provided with an exposure control system that includes a scanning, graded-index microlens array and a pair of superposed light polarizing elements interposed between the selected illuminated image portion and the microlens array with a light transmission axis of one light polarizing element being rotatable with respect to a light transmission axis of the other light polarizing element. In operation a camera operator manually sets the angle between these two transmission axes prior to exposure, in accordance with his subjective determination of image-illumination intensity and therefor the light intensity of the image portion available for transmission to a camera focal plane, during exposure. The operator then actuates the camera to thereby cause the microlens array to scan at a fixed rate, across a light path between the illuminated image and the camera's focal plane and thereby transfer the selected illuminated image portion, of the proper light intensity, to photosensitive material located at the camera's focal plane.

REFERENCES:
patent: 3415644 (1968-12-01), Land
patent: 3594164 (1971-07-01), Rogers
patent: 3753392 (1978-08-01), Land
patent: 4416530 (1983-11-01), Herbert et al.
patent: 4641944 (1987-02-01), Honda et al.

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