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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 8180257 | Photoconductive image forming apparatus with retractable shutter unit An image forming apparatus includes a light irradiation unit configured to irradiate light on the surface of a photoconductive member and form an electrostatic latent image, a developing unit configured to form a developer image corresponding to the electrostatic la... | 05/15/2012 |
| 7372499 | Electronic flash, electronic camera and light emitting head The present invention is directed to a light emitting head for use with an electronic camera. The light emitting head is preferably formed as an array of red, green, and blue light emitting diodes (LEDs) provided on the sides of a light guide member, preferably a po... | 05/13/2008 |
| 7321446 | Color image processing device and color image processing method A color image processing device includes n line sensors which are arranged with a prescribed interval L between one another, an image signal output unit which outputs image signals under a prescribed cycle from the line sensors and a line memory which stores the ima... | 01/22/2008 |
| 7289249 | Image scanner for use in image forming apparatus In an image reading apparatus according to the present invention, a black reference plate used for shading correction includes a light shielding plate. When the light shielding plate shields an optical path leading to a CCD sensor, the light emitted from an illumina... | 10/30/2007 |
| 7236274 | Calibration mechanism for an optical module of a sheet-fed scanner A calibration mechanism for an optical module of a sheet-fed scanner is disclosed. The calibration mechanism includes a calibration strip and a driving unit. The calibration strip is moved by the driving unit, and the calibration strip may be moved relative to the o... | 06/26/2007 |
| 7213984 | Optical density-changing element, optical element and photographic unit To provide an optical density-changing element which has excellent properties that it can be brought into a colored state by applying only a low voltage, that it shows a rapid response speed and becomes completely colorless when restored to a bleached state from the... | 05/08/2007 |
| 7181134 | Optical element changing optical density in response to electromagnetic wave An optical element comprises: an electromotive force-generating element that generates an electromotive force in response to electromagnetic wave; and an optical density-changing element that changes its optical density according to the electromotive force, the opti... | 02/20/2007 |
| 7158145 | Method for applying colored information on an object A description is given of a method for applying colored information to an object (4), the object having at least two different chromophoric particles, at least in a layer (4A) close to the surface, which change the color of this layer (4A) under... | 01/02/2007 |
| 7149457 | Process cartridge and electrophotographic image forming apparatus A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the process cartridge includes an electrophotographic photosensitive drum; process means actable on the electrophotographic photosensitive drum; a cartridg... | 12/12/2006 |
| 6989915 | Image reading apparatus for optically reading image information recorded on sheetlike recording medium An image reading apparatus comprises a correcting mechanism for correcting an output signal from a reading unit in accordance with a reference level. The correcting mechanism includes a reference element for setting the reference level and a drive mechanism for rock... | 01/24/2006 |
| 6922263 | Image scanner for use in image forming apparatus In an image reading apparatus according to the present invention, a black reference plate used for shading correction includes a light shielding plate. When the light shielding plate shields an optical path leading to a CCD sensor, the light emitted from an illumina... | 07/26/2005 |
| 6804029 | Liquid crystal shutter Disclosed is a liquid crystal shutter that uses as a shutter a liquid crystal panel constructed by sandwiching DHF liquid crystal between a pair of substrates provided with one or more pixel electrodes and one or more counter electrodes, wherein a driving waveform f... | 10/12/2004 |
| 5983057 | Color imaging system with selectively openable optical shutter In the information recording an reproducing method and apparatus according to the present invention, a piece of picture image information is recorded as an analog quantity or a digital quantity an information carrying medium in a planar manner at a high d... | 11/09/1999 |
| 5946532 | Variable magnification optical system with light shielding mechanism A lens is moved by a lens moving member in the direction of its optical axis, and a mirror group is moved by a mirror moving member in the direction of the optical axis of the lens. The moving ranges of the lens moving member and the mirror moving member ... | 08/31/1999 |
| 5936652 | Apparatus for protecting a lens array of a printhead used for copy restrictive documents According to one aspect of the present invention, there is provided a printhead protective cover (50) which includes a shutter blade (60), an actuator (70) for moving the shutter blade (60), and a light trap (54) to prevent light from the printhead (12) f... | 08/10/1999 |
| 5655189 | Image device having thermally stable light emitting/receiving arrays and opposing lenses A lens plate is provided with many lenses, and a base plate is provided with many LED arrays and driving ICs arranged at respective opposite ends of the base plate. The lens plate and the base plate are positioned in place relative to each other by spacer... | 08/05/1997 |
| 5649269 | Image recording apparatus having a mask member moving together with an exposure unit An image recording apparatus is designed to decrease the size of an exposure unit, thereby allowing the exposure unit to move within a narrow space between an original document and a photosensitive material, to facilitate color adjustment and density adju... | 07/15/1997 |
| 5634180 | Method for blocking unwanted light from a photoreceptor drum A device and method for blocking light from a laser light beam assembly in a printer, copier, or facsimile machine. Light is blocked from contact with the nonprint region of the photoreceptor drum in a toner cartridge to prevent toner spotting on the outp... | 05/27/1997 |
| 5392101 | Shading compensation device for an image forming apparatus An image forming apparatus has auxiliary reflecting mirrors placed around the lateral peripheries of a fixed reflecting mirror and a controller for moving the auxiliary reflecting mirrors so as to control the distance therebetween according to the size of... | 02/21/1995 |
| 5355198 | Exposure device having light shading members for correcting light distribution of a projection mechanism in a copier An exposure device for use in a copier having a magnification mode, includes a light source having a uniform non-shaded light distribution characteristic when a predetermined magnification ratio is selected; a lens moving mechanism for focusing an image o... | 10/11/1994 |
| 5119134 | Photosensitive member protection shutter for use in a color image forming apparatus A color image forming apparatus wherein a belt-shaped image retainer faces an image forming device. The image forming device includes a charging device, exposure device and a plurality of developing devices which are juxtaposed with each other. The belt-s... | 06/02/1992 |
| 5066987 | Shading board for copying apparatus In an electrophotographic copying apparatus, reflected light from an original subject is directed to a light receiving means, such as a photoconductive drum, through a slit. The apparatus includes an optical device, for example a zoom lens, positioned bet... | 11/19/1991 |
| 5066974 | Auxiliary exposure device for image recording apparatus An auxiliary exposure device for an image forming apparatus which forms an image on a recording medium using slit-scanning exposure. The auxiliary exposure device comprises a reflection member which is insertable into and removable from a light path exten... | 11/19/1991 |
| 4992822 | Optical printing system In an optical printing system for printing an image on a recording sheet, adopted as the recording sheet is a sheet coated with microcapsules on one surface thereon. Each microcapsule envelopes a first component which changes color when reacts with a seco... | 02/12/1991 |
| 4860060 | Microfiche printing system and method A microfiche printing system and method includes an optical system operative to scan and temporarily record microfiche image edge data on a high speed row scanning stroke of a microfiche sheet and to print the row of microfiche images onto plain paper on ... | 08/22/1989 |
| 4833505 | Latent image color developing system A latent color image developing system for copying a document having a first color images and second color images develops the first color images with a first color developer and the second color images with a second color developer. The second color deve... | 05/23/1989 |
| 4801969 | Self-coiling exposure shade An improved electrophotographic reproduction apparatus having a photoconductive member mounted for movement about a closed loop path in operative relation to electrophotographic process stations and a movable scanning mechanism for optically exposing the ... | 01/31/1989 |
| 4794425 | Overhead projector with a copying device An overhead projector in which a light from a light source is transmitted through an original, and a resulting original image is projected on a screen by means of a projection optical system including a projection lens and a half-mirror. At the same time,... | 12/27/1988 |
| 4771316 | Copying device utilizing a parallel lens array An electrophotographic copying machine device provided with a pair of lens arrays installed in parallel to enable variable- or actual-size copying and a means for selectively directing the light-path, allowing each lens array to select its light-path befo... | 09/13/1988 |
| 4755846 | Light transmitting plate holding construction of image forming device A light transmitting plate holding construction of an image forming device comprises an elongated optical filter plate, a holder for holding the optical filter plate and a holder mounting means for mounting the holder on a body of an image forming device,... | 07/05/1988 |
| 4754301 | Multicolor image forming apparatus with a shutter to prevent mixture of developers in plural developing devices An image forming apparatus includes a plurality of the developing devices for developing the latent image formed on an image bearing member. The plural developing devices are each movable between its developing position for developing the latent image on ... | 06/28/1988 |
| 4740815 | Apparatus for compensating for irregularities of illumination for a copier An apparatus for automatically compensating for irregularities of illumination on a photoconductive element of a slit exposure type copier in which a lens is selectively movable along its optical axis and perpendicularly thereto. The apparatus has a simpl... | 04/26/1988 |
| 4540272 | Multicolor printing device A multicolor printing device comprising a latent image formation device, which forms an electrostatic latent image selectively corresponding to a plurality of colors on a latent image formation medium, and a plurality of developing devices which develop r... | 09/10/1985 |
| 4426153 | Apparatus for the reduction of image intensity variations in a continuously variable reducing copier Image transferring apparatus for a continuously variable reduction electrostatic copier. A single fixed aperture is employed, adjacent the object plane, to: (1) reduce image intensity variations caused by non-uniform illumination across the object plane; ... | 01/17/1984 |
| 4416530 | Polarizing filters for enhancing contrast in xerographic copying machines A method for minimizing specular light reflection on copies produced in photocopying machines is provided wherein one or two polarizing filters are located within the photocopying machine.... | 11/22/1983 |
| 4415259 | Variable magnification and reciprocal exposure copying method A variable magnification and reciprocal exposure copying method in which the image of an original is introduced onto a photoconductor which is moved in a predetermined direction by reciprocating mirrors relative to the original, so that the photoconductor... | 11/15/1983 |
| 4403853 | Slit exposure device A slit exposure device movable back and forth in a path parallel to a stationary original for projecting an image of the original in linear portions onto a moving photosensitive element in belt form has a lamp for illuminating the original, an optical sys... | 09/13/1983 |
| 4364656 | Electrophotographic copying machine An electrophotographic copying machine includes a photosensitive member in the form of an endless belt which repeats a stop and an angular motion. A carriage reciprocates above a flat run of the photosensitive member in parallel relationship therewith whe... | 12/21/1982 |
| 4305650 | Illumination system The elimination of strobing in an electrophotographic machine by altering the illumination profile of a projected image at the edges of an exposure aperture located near the photoreceptor surface. The illumination profile is altered by use of a transmissi... | 12/15/1981 |
| 4295714 | Electrostatic cameras A portable camera is described by which electrostatic photocopies can be obtained instead of conventional photographs. The camera includes conventional aperture and optical focusing means for producing an image, a surface on which the image is formed, ele... | 10/20/1981 |
