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7307384 |
Circuit having a second ac/dc converter
A circuit includes a converter for converting an a.c. voltage into a d.c. voltage. The converter has a diode half-bridge, a switch half-bridge, and two d.c. rails. Further, the converter has a...
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6893132 |
Camera-assisted presentation system
In a camera-assisted presentation system, a microcomputer activates a motion detecting module to detect a motion of an object, based on a variation in luminance of image data representing a...
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6623127 |
System and method for enlarging a liquid crystal display screen of a personal data assistant
The present invention is embodied in a system and method for projecting a liquid crystal display (LCD) of a personal data assistant or mobile telephone. In general, the present invention enables...
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5580143 |
Real image direct front projector
A real image direct front projector includes a housing with a plane transparent object support for placing objects thereunder and for permitting light emitted from at least one light source to pass...
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5214458 |
Display apparatus
In order to provide a display apparatus which can express projected images of small characters, illustrations or the like in not only the daytime or an illuminated bright place, but also the...
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5033842 |
Episcopic projector
An apparatus and method for projecting optical images from opaque or transparent objects onto a remote viewing screen includes a plane mirror combination and a reflective projection means. The...
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4988599 |
Electrophotographic color toner having selected index of refraction range
A color toner forming a developed image to be transferred to a transparent sheet by a known electrophotographic method, the refractive index of said color toner being smaller than that of said...
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4952053 |
Transparency overhead projector
The invention concerns a transparency overhead projector having an illumination unit of which the height has been extremely reduced. The main component of the illumination unit is a specular...
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4690527 |
Device for reproduction and tracing
The invention relates to a device for reproduction and tracing by forming an image of an original, at desired scale which is produced by at least one lens, on a screen on which a sheet of...
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4652101 |
Overhead projector
In an overhead projector comprising a writing plate, and under this arranged Fresnel lens, a light source and an objective carried by a carrying arm, the problem to be solved is to overcome the...
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4571041 |
Three dimensional projection arrangement
A projection arrangement for projecting three-dimensional images of objects into space. The object is illuminated by a source of light, and the light rays reflected from the object are directed so...
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4548485 |
Reading device for the visually handicapped
An optical viewing device enabling visually handicapped persons to read ordinary textual material in full color, the device comprising a stage for holding the material and an X-Y positioner used to...
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4279482 |
Illumination of replicas of biological surface tissue
A replica of biological surface tissue with negative topography lying on a platform is illuminated by means of light from a light source disposed inside a base on which the platform is mounted....
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4264168 |
Projection device, especially for photography, motion pictures and television
A housing which is adjustable for height and within which is placed an object to be projected onto a screen also contains a light source and a reflecting system, the light emitted by the source...
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4261657 |
Optical display device
An optical display device for creating the illusion of an object floating in space comprises a lens means having the optical properties of a convex lens, a housing for supporting the lens and an...
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4105313 |
Dual purpose photographic displays
A visual presentation sheet is provided with a photographic image stratum and a liquid crystal stratum. Under certain energy conditions, the liquid crystal stratum scatters incident light so that...
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3951535 |
Low profile episcopic projector
The design of a large copy projector is such that its projection path extends rearwardly and obliquely so that the projector and the viewing screen can be viewed side-by-side. This projector uses...
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3884577 |
Methods and apparatus for object reproduction
Methods and apparatus for photographically-assisted reproduction of continuous line boundaries of three-dimensional objects are disclosed wherein cooperative parts of continuous line boundaries are...
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3804528 |
PRINT PROJECTOR FOR FITTING CONTACT LENSES
Apparatus for use in the fitting of contact lenses. A positive print of a photograph of the eye of a patient is obtained having superimposed thereon a plurality of concentric circles with diameters...
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3535030 |
DISPLAY DEVICE
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3511566 |
PHOTOGRAPHIC EXPOSURE AND PROCESSING APPARATUS
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3408031 |
Vacuum holding device
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3225647 |
Apparatus for viewing gems and similar objects
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3207028 |
Display device for projecting images from superimposed framed silhouettes onto a screen
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3117488 |
Color pattern display system
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3055122 |
Training means for skimming
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2817268 |
Adjustable platform for opaque copy and picture projector
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0991575 |
Title is not available
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0935646 |
Title is not available
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3671117 |
Title is not available
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