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7575330 |
Method and apparatus for increasing effective contrast radio and brightness yields for digital light valve image projectors
The present invention is a method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control...
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7516894 |
Laser display apparatus
Provided is a laser display apparatus for displaying an image by scanning laser light onto a screen. The laser display apparatus includes: a laser and an optical scanning unit scanning laser light...
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7413313 |
Optical shutter with rotational axis in light path of projection device
An apparatus, system, and method for an optical shutter with a rotational axis in the light path of a projection device are disclosed herein.
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7399088 |
Pupil mismatch in a collimated display system
An image projection system has a first lens with a defined entrance pupil. An image source has an image field and a defined exit pupil. The exit pupil of the image source is configured such that...
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7374289 |
Projection type video display
A shutter device can switch between a state where illuminating light from a lamp of an illuminating device is blocked (referred to as a closing state of the shutter device) and a state where...
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7344255 |
Light amount adjusting apparatus and projector using the same
At least a pair of light amount adjusting plates is allocated at peripheral side rim portions of a light path through which light from a light source is projected. These light amount adjusting...
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7338174 |
Shutter device and projection type video display
Each shading plate comprises a rotating shaft and a driving shaft arranged vertically. First divided shading plate is loosely fitted to and supported by (not adhere to) the rotating shaft and...
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7284868 |
Compact projection systems using multiple light sources
The invention relates to a projection system using multiple light sources ( 1 ) at the same time. The projection system ( 100 ) comprises multiple light sources ( 1 ), a lens array system for each...
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7220006 |
Method and apparatus for increasing effective contrast ratio and brightness yields for digital light valve image projectors
The present invention is a method and apparatus for increasing the effective contrast ratio and brightness yields for digital light valve image projectors using a variable luminance control...
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7210795 |
Light quantity adjusting device and projector apparatus using the same
A light quantity adjusting device for adjusting light quantity of a projector apparatus. The adjusting device includes a substrate having an optical path opening and a blade guide surface having...
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7207679 |
Projection type video display
A video signal processing circuit inputs a video signal to perform processing such as frequency conversion as well as processing for generating data representing the APL (Average Picture Level) of...
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7194169 |
Notched adjustable aperture
An adjustable aperture system includes a stationary aperture operable to remove a portion of a lower intensity light communicated through a light bundle. The system also includes an adjustable...
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7185986 |
Projection type video display apparatus, light deflection device in projection type video display apparatus, and direct-view type video display apparatus
In a projection type video display apparatus comprising means for circularly scrolling and irradiating irradiated light in a direction perpendicular to the line direction on a hold-type display...
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7165848 |
Projection type video display
A doughnut-shaped dust-proof plate is externally fitted in the body of the projection lens. The dust-proof plate comprises a first member which is flexible like rubber and a second member made of...
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7131734 |
Projection system using spatial filter
A projection system that can adjust color balance of incident light is provided. The projection system includes a light source, a spatial filter, an optical separator, a scrolling unit, a light...
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7070284 |
Projector apparatus
A projector apparatus includes digital micromirror device (DMD) Color temperature and adjustment of white balance with respect to projection light can be detected in a light condition in a...
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7055965 |
Projection type video display
A shutter device comprises a plurality of shutters. Each of the shutters is provided at a position in the vicinity of a fly's eye lens positioned on the side of a polarization conversion system...
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6827451 |
Multiple light valve lighting device or apparatus with wide color palette and improved contrast ratio
An apparatus is disclosed comprising a lamp which produces a first light which may be a white light; a first light valve, a second light valve, a first color separator, and a first aperture device....
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6726335 |
Shutter for image projection system
An image projection system comprises an image projector, such as a film or television projector and a projection screen. The projection screen is fabricated of a substantially transparent material,...
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6575577 |
Multiple light valve lighting device or apparatus with wide color palette and improved contrast ratio
An apparatus is disclosed comprising a lamp which produces a first light which may be a white light; a first light valve, a second light valve, a first color separator, and a first aperture device....
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6572232 |
Image projection system
An image projection system comprises an image projector, such as a film or television projector and a projection screen. The projection screen is fabricated of a substantially transparent material,...
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6505939 |
Projection system comprising at least two light sources having a unique optical arrangement with respect to at least one spatial light modulator
Projection system comprising at least two light sources, a projection lens and a spatial light modulator located between the light sources and the projection lens, which light modulator comprises a...
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6296359 |
Cinematic film projector
In a cinematic film projector a light source projects light through a single, non-centric light transparent transmission window formed in a rotary shutter, and through an image window and an image...
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5957560 |
Light shutter projector with a fluorescent screen
Disclosed is a ferroelectric liquid crystal display projector employing a fluorescent screen, including a light source emitting light of a predetermined wavelength; a first condensing lens for...
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5813742 |
Layered display system and method for volumetric presentation
A volumetric display system includes a display member which has a plurality of electrically-responsive optical shutters arranged in a layered relationship. The optical shutters include layers of a...
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5690407 |
Shutter for display device of projection type
A shutter has a cylindrical take-up member rotatable about the central shaft thereof, and a thin board having one end portion thereof fixed to the outer peripheral surface of the take-up member and...
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5534955 |
Reflection type projector
A reflection prevention film coats a backside of a stage glass by a vacuum evaporation and coating, etc. A light from a metal halide lamp is not reflected on the back of the stage glass by the...
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RE34634 |
Light illumination device
A device for providing an illumination of an object includes first and second optical integrators disposed on an optical axis in spaced-apart relationship. Light rays emitted from a point light...
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5287131 |
Color LCD system of projection type
A projection color liquid crystal display (LCD) system uses a large reflecting liquid crystal (LC) panel as a screen. The system includes three unicolor light sources for emitting lights of the...
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5214459 |
Overhead projectors
The objective of the invention is an overhead projector (1) supplied with acetate film rolls (4), to which projector belongs a body (2) onto which is fixed a projection arm (16) equipped with a...
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5121984 |
Masking device for use with image projectors
A masking device is provided for use with projectors, such as an overhead projector, to selectively block the projection beam that carries an image disposed on a substrate, such as a transparency,...
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5112123 |
Masking device for overhead projector
A device for selectively masking portions of transparent visual material to be projected by an overhead projector onto a screen including an opaque flexible sheet attached at one side to the...
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5053934 |
Optical arrangement for high-powered diaprojectors
An optical arrangement for high-powered projectors has a metal vapor lamp integrated into an ellipsoidal mirror, and an additional mechanical light valve for the continuous control of brightness of...
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5052798 |
Highlighted module for overhead view projector
A highlighter module, adaptable to an overhead viewer is disclosed. The highlighter, when placed on top of an overhead viewer, will highlight a segment of the displayed information by moving a...
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4859053 |
Projecting apparatus with spherical screen, more particularly for advertising purposes
A screen-forming sphere is made of a front translucent half-sphere and of a rear half-sphere which is opaque except in a central region. An image projector is situated behind the screen and has a...
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4830445 |
Holographic display apparatus
A holographic display apparatus, for displaying an image embodied in a hologram, has a hologram support for receiving and supporting a hologram in a viewing position, a reference light source...
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4813780 |
Image mask for microfilm roll handler
An image mask assembly for a microfilm roll handler includes an insert having an opaque area which can be slid relative to a frame of microfilm to block light through a portion of the film and...
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4688911 |
Image mask for microfiche
An image masking device for a microfilm reader and/or reader-printer is formed to slide longitudinally of a microfiche handler and comprises a thin opaque mask adapted to ride on the film handler...
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4688910 |
Transparency presentation device
The invention relates to a device for facilitating the handling of transparencies to be projected by an overhead projector. The device includes a support frame which can be secured by adhesive...
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4648695 |
Illumination apparatus for testing photoelectric transducer device
An illumination apparatus for testing photoelectric devices such as solid-state image sensors is capable of easily switching between sufficient uniform illumination and high-luminance spot...
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4606627 |
Light shutter mechanism for planetarium
There is disclosed a light shutter mechanism for lens projector used in a planetarium and being capable of any required rotation. The light shutter mechanism comprises a plurality of inwardly...
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4557554 |
Light projectors
This invention relates to a light projector comprising a shutter in front of a connector socket arranged to receive the plug of an optical fiber cable insertable thereinto, and the proximal end of...
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4486081 |
Optical image projector
An optical image projector suitable for projecting symbols in an artwork generator comprises a projector head beam relative to which a photographic film 16 can be positioned accurately. The head...
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4468720 |
Variable mask device for an illuminator
A variable mask device for use with an illuminator comprising a projection window, a plurality of variable mask plates for optionally varying the size and shape of the projection window and means...
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4429963 |
Slide transfer and shutter control arrangement for slide projector
A slide transfer and shutter control arrangement is provided for a slide projector including a simplified shutter control arrangement and a positive acting slide sensor arm that is slidably mounted...
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4350428 |
Shutter mechanism
A shutter is rotatably mounted within a housing for opening and closing a shutter aperture formed in the housing. The shutter is coupled to a drive unit for unidirectionally rotating the shutter...
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4200368 |
Slide presence shutter lock
A slide projector located within a rear-screen projector housing has a slide tray and slide positioning mechanism, which includes a shutter and slide clamp control portion, in cooperative relation...
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4078861 |
Aperture control mechanism, particularly for planetarium projectors
An aperture control mechanism particularly for use in planetarium projectors, including a weight lever for controlling the horizontal position of the edge of an aperture, said weight lever is...
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4060318 |
Projection apparatus
A projector for projecting a movable spot of light onto a screen includes a pair of plates mounted adjacent and parallel to each other, each plate being opaque, apart from a straight slot. The...
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3884569 |
Slide tray and slide positioning mechanism for a rear-screen projector
A slide projector located within a rear-screen projector housing includes a slide tray and slide positioning mechanism in cooperative relation with a gravity feed slide tray which is removably...
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