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US 5,379,083 AGranted
Projector
AssigneeRaychem Corporation
InventorAkira Tomita
Life of this patent
Estimating the term…
Abstract
A projector having a light valve which operates by alternatively transmitting incident light or scattering such light has adjustable illumination and projection apertures to maximize contrast ratio and brightness according to ambient light conditions.
Claims20
A projector, comprising:
- (a) a source of light;
- (b) a light valve which comprises a plurality of elements, each of which can be independently switched between a state in which incident light incident from the source is substantially transmitted or reflected and a state in which incident light from the source is substantially scattered to impart an image to the incident light;
- (c) an illumination light controller which is disposed between the source and the light valve and is adjustable to provide a variable illumination aperture for controlling the degree of collimation of light reaching the light valve from the light source;
- (d) projection lens for projecting onto a screen imaged light received from the light valve;
- and
- (e) a projection aperture controller which is adjustable to provide a variable projection aperture for controlling the amount of imaged light transmitted by the light valve which is projected to the screen by the projection lens.
3 more elements
A projector, comprising:
- (a) a source of light having a characteristic image size;
- (b) a light valve which comprises a plurality of elements, each of which can be independently switched between a state in which incident light incident from the source is substantially transmitted or reflected and a state in which incident light from the source is substantially scattered to impart an image to the incident light;
- (c) projection lens for projecting onto a screen imaged light received from the light valve;
- and
- (d) a projection aperture controller which is adjustable to provide a variable projection aperture for controlling the amount of imaged light transmitted by the light valve which is projected to the screen by the projection lens;
- the image size of the source of light being smaller than the smallest aperture to which the projection aperture controller can be adjusted.
3 more elements
Dependencies are inferred from the claim text.