Optics: image projectors – Plural projection paths with single light source
Patent
1987-05-20
1988-10-25
LaRoche, Eugene R.
Optics: image projectors
Plural projection paths with single light source
350360, 353122, G02B 2600, G03B 2100
Patent
active
047799633
ABSTRACT:
Light emitted by a source arrives through a system of lenses and a first system of bars on the control layer of a control element. The light is reflected and refracted in keeping with local deformation of the control element nad then conducted through a concave mirror, a second bar system and a further system of lenses onto a projection surface. The image to be amplified is reproduced by means of a system of lenses on a photoelectric conducting layer in the control element. A control layer is a layer of gel and is located between two electrodes in an alternating electrical field, which may be affected by the photoelectric conducting layer. The electrode adjacent to the photoelectric conducting layer is electrically insulated relative to the photoelectric conducting layer and is in the form of a strip grid, the strips of which are connected alternatingly to one or the other pole of a source of alternating voltage. One of the poles is connected with the other electrode. An automatic switch periodically alters the polarity of the strips of the electrode grid. The alternating polarity of the strips, and the electrically insulating layout of the photoelectric conducting layer, effect an improved modulation and reduce undesirable space charge effects.
REFERENCES:
patent: 3465202 (1969-09-01), Kohashi
patent: 3638027 (1972-01-01), Koelmans
patent: 4023969 (1977-05-01), Sheridon
patent: 4279000 (1981-07-01), Fukuda et al.
patent: 4280756 (1981-07-01), Albertinetti
patent: 4519682 (1985-05-01), Mast et al.
Gretag Aktiengesellschaft
LaRoche Eugene R.
McCutcheon Nathan W.
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