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Class 353/76 - Focus or variable magnification


Subclass of Class 353 - Optics: image projectors
Definition: Subject matter including adjustable structure to focus the
No. of patents: 43
Last issue date: 02/28/2012


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NumberTitleIssue Date
8123364Rear-projection type display comprising a light measurement unit to measure reflected light from a fresnel screen
In order to provide a display apparatus with high image quality which can detect a change in light on an entire display frame without any influence on user's appreciation, a rear-projection type display apparatus which projects irradiating light from a light source ...
02/28/2012
7365907Rear projection image display apparatus
A compact rear projection image display apparatus in which the projection distance in a projection optical system is substantially reduced and no reflection mirror is used, thereby eliminating a major cause of image trapezoidal distortion. The rear projection image ...
04/29/2008
7347566Projection lens unit and rear projection type image display system
An inexpensive projection lens unit in a rear projection type image display system, having a short focal distance (wide angle of viewing field), high focus and high contrast, and as well, including a power lens made of a glass material having a high refractive index...
03/25/2008
7261420Projection optical unit and projection image display apparatus
A projection optical unit for enlarged projection of an image displayed by an image display element includes a first projection optical unit having positive refractive power, and a second projection optical unit having positive refractive power for further enlarging...
08/28/2007
7256951Light guide display with protective layer
Provided is a light guide display with a protective layer. The light guide display includes a plurality of aligned magnifying layers providing a viewing surface. Each magnifying layer includes a plurality of light guides, each light guide having an input end, a mids...
08/14/2007
7244030Rear projection type image display device
The present invention relates to a rear projection type image display device comprising projection lenses (2, 3) for projecting an image displayed on an image display element onto a transmission type screen (6) on a larger scale, an optical path turn-b...
07/17/2007
7239806Sliding cover
A sliding cover for protecting camera lens and switching the power of the camera, comprising a cover plate and a permanent magnet. The cover plate is slideably connected with the front shell of the camera, a magnetic induction switch is installed at the inner side o...
07/03/2007
7222969Split image optical display
A video image is displayed from an optical panel by splitting the image into a plurality of image components, and then projecting the image components through corresponding portions of the panel to collectively form the image. Depth of the display is correspondingly...
05/29/2007
7195358Rear projection type image display device
The present invention relates to a rear projection type image display device comprising projection lenses (2, 3) for projecting an image displayed on an image display element onto a transmission type screen (6) on a larger scale, an optical path turn-b...
03/27/2007
7172292Projection lens unit and rear projection type image display system
An inexpensive projection lens unit in a rear projection type image display system, having a short focal distance (wide angle of viewing field), high focus and high contrast, and as well, including a power lens made of a glass material having a high refractive index...
02/06/2007
7159988Projection optical unit and projection image display apparatus
A projection optical unit has two lens groups. A first projection optical unit disposed closest to an image display element, temporarily forms a first enlarged image (magnification: M1) at the image display element side, rather than at a second projection opt...
01/09/2007
7104652Image display device and projector
To provide an image display device and a projector having a brightness or an excellent utilization efficiency of the light by improving the display performance of a moving picture. A projector includes a light source for emitting illumination light, a liquid crystal...
09/12/2006
7048381Cylindrical lens array for scrolling colors, projection system using same, and scrolling method
A cylindrical lens array for achieving color scrolling, a projection system using the cylindrical lens array, and a scrolling method. The cylindrical lens array is formed by arranging lens cells in an endless track. When the cylindrical lens array rotates, light ray...
05/23/2006
6912329Fiber color detector method and apparatus
A fiber color detector is presented. A magnifying glass and a receptacle are formed in a housing. In addition, a platform including a first side facing the magnifying glass and a second oppositely disposed side is located within the housing. A light source located w...
06/28/2005
6869187Projection type display apparatus
Light radiated from a light source passes through a liquid crystal display device and a projection lens and is reflected by a mirror, thus reaching a screen. The projection lens has a zoom function to scale up an image displayed on the display device by an arbitrary...
03/22/2005
6837584Peak brightness improvement for LC/DLP based RPTV
A method and apparatus for producing an apparent increase in display brightness in an RPTV engine without an actual increase in total light output. Light is generated with an illumination source and optically processed to produce a light beam of rectangular format. ...
01/04/2005
6808271Projection type display apparatus
In order to achieve a great improvement in light utilizing efficiency, a projection type display apparatus for obliquely projecting an original image onto a screen includes a first projection optical system for projecting light from an original picture and forming a...
10/26/2004
6702445Image projector forming scrolling image
An image projector includes a film assembly, motor, light source and lens. The film assembly includes a periscope having a first aperture, the film assembly being configured so as to mount a film to scroll in front of the first aperture of the periscope. ...
03/09/2004
6616283Projector
In a rear projector for projecting an image from behind a screen, its screen size is variable. In order to permit flexible adaptation to the variation in the screen size, the projector is constructed to permit easy adjustment of a detection device for det...
09/09/2003
6530666Focusing projection displays
A system detects reflected light from a projection screen associated with a projection display. Reflected light may be analyzed to determine whether the projector is in focus. This information may be used to create input signals that automatically focus t...
03/11/2003
6511186Focus and aim device and method for image projection
An image projection system includes an image generator, a screen and a focus and aim component. The focus and aim component receives modulated light from the image generator and focuses and deflects the light as a function of a position on the screen. The...
01/28/2003
5690772Method for mass-producing eccentric Fresnel lens sheets
A method for mass-producing eccentric Fresnel lens sheets comprising the steps of: preparing a number of concentric Fresnel lens sheets; dividing the concentric Fresnel lens sheets into a first set and a second set each including a plurality of Fresnel le...
11/25/1997
5637359Plastic substrate liquid crystal display device, method of making, and product produced by the method
There is provided a plastic liquid crystal display device in which an aligning film processing can be carried out at 150 to 180° C. and which can have optical characteristics comparable to those of the conventional glass substrate liquid crystal display ...
06/10/1997
5307098Projection inspecting machine
A projection inspector which projects the image of an object being measured onto a screen for a visual inspection. It may be used with a microscope for observation in detail. Unlike the conventional projection inspector, the inspector fully exhibits high ...
04/26/1994
5119239Magnifier apparatus and method for hand held video display
A magnifier apparatus for use with a hand-held video display apparatus which magnifier apparatus has a frame with a magnifier lens, the frame secured to a support, the support releasably adapted to be secured in a snap-in relationship to the sides of the ...
06/02/1992
5078487Projecting apparatus
A projecting apparatus comprises support device for supporting an original, a projection optical system for forming the image of the original, an optical element disposed on the image side of the projection optical system to cause a principal light ray ha...
01/07/1992
5005967Microfilm image processing apparatus having automatic focus control capabilities
A microfilm image reader apparatus for detecting an image on a microfilm strip and projecting the detected image onto a target plane, wherein a beam of light bearing an image detected from the microfilm strip is produced by illuminating the microfilm stri...
04/09/1991
4909623"Microfilm image processing apparatus"
A microfilm image processing apparatus in which a plurality of zoom lenses having different ranges of magnification are provided for selective use and in which each of the zoom lenses has an associated zoom control gear coaxially disposed aroung the lens ...
03/20/1990
4902117Clothing image mirror projection system
A clothing image mirror projection system for producing a composite image of an article of clothing superimposed upon the reflected image of a viewer's face includes a two-way mirror, a rear projection screen, and apparatus for projecting an image of an a...
02/20/1990
4746208Method and an apparatus for expanding magnification range of a photographic projector
The photographic projector is adapted that a lens seating plate to which a projecting lens is fixed is provided so that it maybe moved in the optical direction with respect to the lens holder. When the base of the lens holder reaches even to the end of it...
05/24/1988
4730919Slide viewer
A folding slide viewer has a rear projection screen which swings into a ft position for storage. In a second, operating position, the projection screen it is provided with a lightproof bellows. The optical axis of the lens system is inclined at an angle ...
03/15/1988
4605294Composite optical display method and related apparatus
The installation permits the adjustment in succession on a screen E of the size of a series of typical images which are to be made to merge with the image of a person P so as to enable this person to view through a mirror M composite images thus obtained....
08/12/1986
4410248Optical and focusing arrangement for microfiche reader
The microfiche reader has two lenses carried by a segment mounted on an eccentric pivot which can be adjusted to move the pivot and, therefore, the lenses are in an eliptical orbit which permits the lens in the operative position to be centered on the opt...
10/18/1983
4240721Cooking with recipes through improved viewing machine or wall screen projection
A projector into which are placed slides having various cooking recipes imprinted thereupon, and the invention including a screen, upon which the recipe is projected greatly enlarged, so that a homemaker can more easily see the enlarged text, while making...
12/23/1980
4221473Image expander for rear-screen projectors
A slide projector located within a rear-screen projector has means therein for projecting images, contained on slides, onto a self-contained projection screen. Two lenses having different focal lengths are mounted within the projector housing and may alte...
09/09/1980
4146315Lens moving device for opaque reader
A magnification of the displayed image of an opaque reader can be changed between first and second values by a single manual movement. A diopter lens disposed in front of the projection lens provides a first magnification. The single movement functions to...
03/27/1979
4139283Rear projection viewer having automatically erecting auxiliary screen
A rear projection viewer apparatus of the type wherein a projected image is projected towards a primary viewing screen which when in its operative viewing position forms the front of the viewer, the front viewing screen being attached to other portions of...
02/13/1979
4136935Rear projection viewer having auxiliary viewing screen
A rear projection viewer apparatus of the type wherein a projected image is projected towards a primary viewing screen forming the front of the viewer, the front viewing screen being removably located with respect to other portions of the viewer housing s...
01/30/1979
4119372Microfiche inspection apparatus
A microfiche viewer structured for examining new microfiche film. The film is typically still in roll form as it comes from the microfiche camera. Plural magnifications of the microfiche image are selectively available; one, to reproduce a whole fiche upo...
10/10/1978
4094598Micro display with magnifier
An apparatus for displaying a magnified image having a console with a rear lighted projection screen, the console including a light source, a specimen holder, and a lens system for displaying a magnified image of the specimen on the rear surface of the sc...
06/13/1978
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