Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 6328449 | Brewster-angle dispersion filter (U) A particular wavelength may be eliminated from the spectrum of a randomly polarized thermally radiative scene by a quarter-wave polarizer and a dielectric dispersive mirror angularly positioned at the Brewster angle for the particular wavelength. The scen... | 12/11/2001 |
| 6243198 | High efficiency electromagnetic beam projector and systems and method for implementation thereof This invention relates to electromagnetic wave beam paths, formation of the beam, illumination of programmable electromagnetic wave field vector orientation rotating devices ("PEMFVORD") with an electromagnetic beam, and the technique of projection of the... | 06/05/2001 |
| 6141124 | Color filter and color picture display device using the same A color filter which, in a reflection type color picture projector using a polarized light component as a projection light, improve the utilization factor of light and a color picture display device using the same color filter are provided. The color filt... | 10/31/2000 |
| 6111700 | Optical display device having a reflection-type polarizer A polarization device includes a reflection-type polarization element disposed at a side to which an optical beam comes in and an absorption-type polarization element disposed behind the reflection-type polarization element, wherein the reflection-type po... | 08/29/2000 |
| 6088159 | Reflective polarizers having extended red band edge for controlled off axis color Reflective polarizers, which transmit one polarization and reflect the other polarization, have an extended red band edge in the off-axis transmission spectrum to control off axis color (OAC) hue. To control the OAC hue, the red band edge of the off-axis ... | 07/11/2000 |
| 6025890 | Beam splitter element including a beam splitting layer and a polarizing layer for use in a light polarization modulating display system A display system includes a reflective mode spatial light modulator for producing a pattern of polarized light, a light source for illuminating the spatial light modulator, and an optics arrangement. The optics arrangement includes a beam splitter element... | 02/15/2000 |
| 5936768 | Optical passive device for an optical fiber amplifier and the optical amplifier An optical device of the invention having a first doubly refracting crystal plate of parallel plate type whose crystal optical axis is inclined in relation to the optical axis of an incident light, a second doubly refracting crystal plate of parallel plat... | 08/10/1999 |
| 5808794 | Reflective polarizers having extended red band edge for controlled off axis color Reflective polarizers, which transmit one polarization and reflect the other polarization, have an extended red band edge in the off-axis transmission spectrum to control off axis color (OAC) hue. To control the OAC hue, the red band edge of the off-axis ... | 09/15/1998 |
| 5777789 | Efficient optical system for a high resolution projection display employing reflection light valves An optical system is described consisting of reflection birefringent light valves, polarizing beam splitter, color image combining prisms, illumination system, projection lens, filters for color and contrast control, and screen placed in a configuration o... | 07/07/1998 |
| 5751483 | Color filter having polarizability The present invention relates to a color filter having polarizability, which comprises a dye having a spectral transmissibility, a dichroic dye having a polarizability, corresponding to the former dye and a base resin. The filter can be produced by coatin... | 05/12/1998 |
| 5715085 | Optical filter An optical filter comprising a birefringent material which is interposed between a taking lens and an image pickup device for removing a component corresponding to a frequency multiplexing in a spacial frequency manner from a high frequency component cont... | 02/03/1998 |
| 5513892 | Sun glare shield An extendable automobile sun glare shield may be constructed with a body of opaque material with a shield of polaraized material having a film of black glass covering the upper section of the shield slidably disposed to extend and retract from a cavity di... | 05/07/1996 |
| 5202744 | Electro-optical measuring instruments The present invention relates to an optical routing module (2) suitable for use in a light microscope (1) for sample inspection simultaneously with a primary light source (10) and a secondary light source (7) of different wavelength. The module (2) compri... | 04/13/1993 |
| 5096520 | Method for producing high efficiency polarizing filters The manufacturing cost of color liquid crystal displays depends on improving the yield of making color filter arrays and the polarization efficiency of polarizers to increase the brightnesse, and to reduce the power of the back light. The invention descri... | 03/17/1992 |
| 5076669 | Method and apparatus for selectively blocking light beams of different wavelengths with single color-sensitive filter A method and apparatus for selectively blocking light beams of different wavelengths with the use of a single color-sensitive filter by passing the beams through a multiple layer system consisting of an input polarization plate (12), an output polarizatio... | 12/31/1991 |
| 5040880 | Quartz optical filter By forming corner parts of transparent quartz plates and the glass plate in rounded arc shape, in a mirror-surface finishing to accurate plane, polishing powder grain can flow out smoothly and evenly from all the periphery of the plates, and thus the surf... | 08/20/1991 |
| 4856879 | Aiming device An aiming device (diopter) has an easily removable eyepiece with adjustable diaphragm mounted on one end of a housing portion which housing portion has a cavity eccentrically formed therein. A color filter disc and two polarizing filter discs are rotatabl... | 08/15/1989 |
| 4747673 | High power optical attenuator An attenuator for high power laser beams, the attenuator has an annular b dump through which the beam passes diametrically and in which the beam passes successively through a pair of pivoting transmissive and reflective element. These elements are indivi... | 05/31/1988 |
| 4703229 | Optical display from XeF excimer fluorescence An excimer optical display includes a plasma panel device having therein a mixture of gas comprising xenon and molecular fluorine and a selected amount of other gases forming XeF excimer molecules such that the color of fluorescence is adjustable over a b... | 10/27/1987 |
| 4697890 | Light emitting device A device, such as a flashlight, spotlight, or reading light, for emitting an incident beam of light wherein the intensity and color of an incident beam of light emitted from the device can be manually modulated or adjusted. The device utilizes a variable ... | 10/06/1987 |
| 4650286 | Liquid crystal light value color projector A compact, full color, light projection system using a liquid crystal light valve (LCLV) and a unique combination of optical devices. The LCLV operates to modulate a light beam which has been polarized by one of the optical devices. The modulated light be... | 03/17/1987 |
| 4626897 | Optical filter for color imaging device A spatial frequency filter apparatus for suppressing spurious signals of the type generated in a color television camera incorporating a mosaic color encoding filter for multiplexing color signals includes two double refraction plates for filtering natura... | 12/02/1986 |
| 4544237 | High efficiency optical tank for two-color liquid crystal light valve image projection with color selective prepolarization The invention provides a two-channel liquid crystal light valve image projection system with prepolarization using an oil coupled optical arrangement. A prepolarizing beam splitter is mounted the container in optical alignment with a first surface for spl... | 10/01/1985 |
| 4500172 | Two color liquid crystal light valve image projection system with single prepolarizer An optical arrangement is disclosed which provides color selective prepolarization of the light incident upon two or more light valves. This is accomplished by the use of a prepolarizing prism which acts on light from a light source to direct light of a f... | 02/19/1985 |
| 4464018 | Liquid crystal light valve image projection system with color selective prepolarization and blue mirror An optical system is disclosed which incorporates a color selective prepolarizer to improve contrast and reduce stress induced birefringence while allowing a blue mirror to be used to enhance the projected image. The invention includes a source lamp for p... | 08/07/1984 |
| 4461542 | High efficiency optical tank for three color liquid crystal light valve image projection with color selective prepolarization A first color selective beam splitter is provided for splitting light from a source into first and second beams, the first beam being blue and the second beam having red and green color components. A second beam splitter is provided for directing light of the ... | 07/24/1984 |
| 4392723 | Aiming device An aiming device has arranged in a tubular housing an adjustable iris diaphragm, a polarizing filter and a number of color filters. The color filters are mounted on a filter disc which is rotatably supported in the housing and provided with circumferentia... | 07/12/1983 |
| 4346962 | Light analyzing lenticular screen for viewing stereo images A screen construction enables three dimensional perception of projected stereo images without necessarily requiring that the viewer wear analyzing eyeglasses. Three dimensional shadow image data is generated by projecting light towards the screen, through... | 08/31/1982 |
| 4286843 | Polariscope and filter therefor The filter comprises a multiplicity of light polarizing elements which polarize light in a plurality of planes, and a multiplicity of filtering means associated with the light polarizing elements. In a polariscope, light is directed from a source through ... | 09/01/1981 |
| 4278736 | Contrast enhancement filter and method Contrast enhancement filter having first and second transparent glass substrates with first and second surfaces with the first surface of each facing the medium in which the filter is disposed. A sheet-like circular polarizer is provided formed of stretch... | 07/14/1981 |
| 4256368 | Color contrast sensitivity measuring device An apparatus for generating patterned images which are variable in color contrast and spatial frequency while retaining a substantially constant, uniform level of photometric luminance. Two broad spectrum beams of luminous energy are individually projecte... | 03/17/1981 |
| 4063266 | Adjustable polarized filters for cameras Filter case rotatably carries two filter retainers each with a linearly polarized filter, each at the same angular position. A perforated belt engages around the sprocket teeth on the filter retainers so that the two filters are rotated together. Filter c... | 12/13/1977 |
| 3936147 | Variable characteristic light filter A variable color light filter system comprises a variable light filter including a pair of superimposed different color chromatic polarizing components with axes at a right angle to each other and an achromatic polarizing filter component which is rotatab... | 02/03/1976 |
