Light-modulating device

Details Light-modulating device Light-modulating device

1973-10-23

1976-09-21

Corbin, John K.

Telegraphy

Systems

Printing

178 792, 350314, G05D 2500

Patent

active

039815650

ABSTRACT:
A light-modulating device having an extended range of light modulation comprising a mechanical variable diaphragm means and a neutral density filter arranged to optically cover the aperture opening of said diaphragm means, said filter being characterized as including two regions, one of which is a central uniform density region which is centered at the optical axis, while in the other region contiguous to the central region, the density is decreased with radius. In this manner the amount of light is varied in passing through the light-modulating device as a function of the area of the aperture opening and the transmittance of effective area of the filter. A method of producing filters of such characteristics are also disclosed.

REFERENCES:
patent: 3669540 (1972-06-01), Rattman et al.
patent: 3700314 (1972-10-01), Busby

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