Optical: systems and elements – Light control by opaque element or medium movable in or...
Patent
1993-04-28
1995-02-28
Ben, Loha
Optical: systems and elements
Light control by opaque element or medium movable in or...
359234, 359236, 348362, 250229, G02B 2602
Patent
active
053942639
ABSTRACT:
A light valve for attenuating a collimated light beam contains a focusing lens, a light vane and motor control. The focusing lens contains a focal length and lens diameter. The focusing lens focuses a collimated light beam to generate a light cone such that the dimensions of the light cone are based on the diameter and focal length of the focusing lens. The light vane deflects light within the light cone. The motor is controlled to position the light vane to attenuate the light within the light cone by placing the light vane in at least one position ranging from a zero stop attenuation position to a full stop attenuation position. For a single degree of light vane rotation into the light cone, the light beams is attenuated by three percent. In the zero stop position, the light vane is parallel to an edge of the light cone so that no light is attenuation. In the full stop position, the light vane is located thirty degrees, relative to the zero stop position, into the light cone.
REFERENCES:
patent: 4193676 (1980-03-01), Ueda et al.
patent: 4943815 (1990-07-01), Aldrich et al.
patent: 5087122 (1992-02-01), Ostrander et al.
Galt John
Pearman James
Ben Loha
Phan James
Sony Electronics Inc.
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