Frustrated total internal reflection camera shutter

Details Frustrated total internal reflection camera shutter Frustrated total internal reflection camera shutter

1979-10-01

1981-02-10

Gonzales, John

354155, 354227, G03B 908, G03B 1912

Patent

active

042498147

ABSTRACT:
An improved camera shutter system which employs the principles of frustrated total internal reflection as a means for controlling transmission of light to a camera film. The shutter is comprised of at least two prism elements, one facing the other and one movable with respect to the other, to allow a common adjoining surface to move from a closed position to an open position wherein the surfaces have a space or gap therebetween. When the surfaces are open having a space or gap in between, the gap is at least just slightly larger than a wave length of light, with the result being that light is reflected rather than transmitted from one prism to the other. When the gap is closed, light is transmitted directly through one prism into the other and from there to a film positioned behind the second prism.

REFERENCES:
patent: 2455763 (1948-12-01), Harrison
patent: 3230851 (1966-01-01), Reymond
"Optical Modulation Developed For High-Power IR Laser", In Electronic Design, vol. 24, No. 25, pp. 36, 38, 12-1976.

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