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公开(公告)号：US3873895A
公开(公告)日：1975-03-25
申请号：US42205073
申请日：1973-12-05
Applicant: XEROX CORP
Inventor： GALLO JR CHARLES F , HAMMOND THOMAS J
CPC classification number: G03G13/02 , Y10S264/14
Abstract: A technique for charging a stationary dielectric surface by corona discharge is described in which the voltage applied to a stationary corona wire is steadily increased over a time period to cause the gradual increase in voltage level on the dielectric surface over the same time period. The dielectric surface voltage increases with the wire voltage. The potential difference between wire and plate is kept below the sparking or arcing voltage and above the threshold voltage. In an arrangement employing a moving dielectric surface, plural corona wires are maintained at successively higher voltages to increase the charge on the dielectric in steps, each step being such as to maintain the potential difference between wire and surface below the arcing voltage.
Abstract translation: 描述了通过电晕放电对固定电介质表面进行充电的技术，其中施加到静止电晕丝的电压在一段时间内稳定地增加，以使电介质表面上的电压电平在同一时间段内逐渐增加。 电介质表面电压随导线电压而增加。 线和电极之间的电位差保持低于火花或电弧电压并高于阈值电压。 在使用移动的电介质表面的布置中，多个电晕丝保持连续更高的电压以逐步增加电介质上的电荷，每个步骤都要保持导线和表面之间的电位差低于电弧电压。
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公开(公告)号：CA1108214A
公开(公告)日：1981-09-01
申请号：CA303069
申请日：1978-05-10
Applicant: XEROX CORP
Inventor： HAMMOND THOMAS J , NORTHRUP KARL A , GALLO CHARLES F
Abstract: LOW PRESSURE SODIUM VAPOR DISCHARGE LAMP A low pressure sodium vapor discharge lamp for generating directional light output, the lamp including a cylindrical discharge tube within a cylindrical outer envelope. The outer envelope is provided with a diffuse coating which is highly reflective of visible sodium light and which defines a clear aperture on the outer envelope for the directional escape of visible light. The space between the inner discharge tube and the outer envelope is air filled to provide conductive and convective heat dissipation from the discharge tube. Sodium condensation takes place in a plurality of spaced reservoirs located in the portion of the discharge tube away from the aperture to keep that portion of the discharge tube facing the aperture clear. A heater coil is wound around the inner discharge tube to keep it at a desired standby temperature for lamp use on demand. The lamp filament electrodes are also maintained at standby temperature to improve the illumination profile along the lamp.
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公开(公告)号：CA1091284A
公开(公告)日：1980-12-09
申请号：CA298850
申请日：1978-03-14
Applicant: XEROX CORP
Inventor： HAMMOND THOMAS J
Abstract: A low pressure sodium vapor lamp including a sodium vapor discharge tube within an outer envelope. The outer envelope is partially coated by a light reflector defining a light transmission aperture for desired directional light output. The outer envelope is additionally coated with an infrared reflective coating defining a heat transmission aperture at a location separate from the light transmission aperture. The heat transmission aperture acts as a heat sink. The area of the inner discharge tube corresponding to the heat transmission aperture thus becomes the coolest portion of the discharge tube, the "cold spot" of the lamp where excess sodium is condensed.
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公开(公告)号：DE69315784T2
公开(公告)日：1998-07-16
申请号：DE69315784
申请日：1993-09-20
Applicant: XEROX CORP
Inventor： REES JAMES D , HAMMOND THOMAS J , CASELLA JAMES M
Abstract: The present invention relates to a color printer which forms multiple latent images on the surface of a belt type photoreceptor in a single pass. The invention enables the placement of imaging stations (29,30,32,34) on both a tensioned and non-tensioned side of the belt (36) On the non-tensioned, an asynchronous line at a time printer such as an LED print bar (34A) is used to form the latent image in response to video data signals. On the tensioned side of the belt, either synchronous type imagers (29A,30A,32A), such as laser ROSs or asynchronous imagers such as LED print bars may be located to form the latent image. The leading edges of each image frame are registered according to known methods. Each scan line within an image frame is registered by comparing the belt speed beneath each of the imagers and generating a correction signal to the asynchronous print bar. Since the print bar operates asynchronously, it is possible to vary the pulsed line write time so as to register each of the scan lines formed by the print bar with the scan line being formed by the imagers at the tensioned side of the belt.
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Patent Agency Ranking
公开(公告)号：CA2089218A1
公开(公告)日：1994-02-18
申请号：CA2089218
申请日：1993-04-07
Applicant: XEROX CORP
Inventor： HART STEVEN C , HUBBLE FRED F III , HAMMOND THOMAS J , FOLKINS JEFFREY J , MARTIN JAMES P
IPC: B41J2/51 , B41J2/385 , B41J2/46 , G03G15/01 , G03G15/36 , G03G21/14 , G03G15/04 , G03G13/04 , G03G15/00
Abstract: An apparatus for positional tracking a moving photoconductive belt and adjusting an imager in an electrophotographic printing machine to correct for alignment errors when forming a composite image. Registration errors are sensed by developing an appropriate set of target marks, detecting the target marks, and controlling the position of the imager.
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公开(公告)号：CA1150759A
公开(公告)日：1983-07-26
申请号：CA369687
申请日：1981-01-29
Applicant: XEROX CORP
Inventor： HAMMOND THOMAS J , NORTHRUP KARL A
IPC: H01J61/36 , H01J61/04 , H01J61/067
Abstract: A tubular arc low pressure discharge lamp is disclosed which has its end electrodes connected through the lamp envelope then to the tube pins. This permits the electrodes to be physically located closer to the lamp ends and decrease end illumination falloff.
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公开(公告)号：DE69315784D1
公开(公告)日：1998-01-29
申请号：DE69315784
申请日：1993-09-20
Applicant: XEROX CORP
Inventor： REES JAMES D , HAMMOND THOMAS J , CASELLA JAMES M
Abstract: The present invention relates to a color printer which forms multiple latent images on the surface of a belt type photoreceptor in a single pass. The invention enables the placement of imaging stations (29,30,32,34) on both a tensioned and non-tensioned side of the belt (36) On the non-tensioned, an asynchronous line at a time printer such as an LED print bar (34A) is used to form the latent image in response to video data signals. On the tensioned side of the belt, either synchronous type imagers (29A,30A,32A), such as laser ROSs or asynchronous imagers such as LED print bars may be located to form the latent image. The leading edges of each image frame are registered according to known methods. Each scan line within an image frame is registered by comparing the belt speed beneath each of the imagers and generating a correction signal to the asynchronous print bar. Since the print bar operates asynchronously, it is possible to vary the pulsed line write time so as to register each of the scan lines formed by the print bar with the scan line being formed by the imagers at the tensioned side of the belt.
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公开(公告)号：DE3164487D1
公开(公告)日：1984-08-09
申请号：DE3164487
申请日：1981-02-02
Applicant: XEROX CORP
Inventor： HAMMOND THOMAS J , NORTHRUP KARL A
Abstract: A low pressure electric discharge lamp has its end electrodes (24) connected through the lamp envelope (2) then to pins (28) projecting from the curved sidewall of the envelope. This construction permits the electrodes to be physically located closer to the lamp ends, and decreases end-illumination falloff.
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公开(公告)号：JP2000158708A
公开(公告)日：2000-06-13
申请号：JP32749399
申请日：1999-11-17
Applicant: XEROX CORP
Inventor： HAMMOND THOMAS J , JAMES D REES
Abstract: PROBLEM TO BE SOLVED: To provide an electrophotographic printing press using an exposure station which uses a light-emitting diode of reduced water front requirements. SOLUTION: The printing press includes a photosensitive body 10, a charging device 302 arranged in the vicinity of the photosensitive body 10, an exposing device 300 placed in the vicinity of the photosensitive body and charging device and having a plurality of light-emitting diodes on one object face, a gradient index lens array 308 arranged between the plurality of light-emitting diodes and the photosensitive body and having a plurality of gradient index rods for condensing lights from the plurality of light-emitting diodes onto the photosensitive body, a cooling assembly 306 separately arranged from the photosensitive body with a larger breadth than the plurality of light-emitting diodes for cooling the light-emitting diodes, and a developing station 304 set in the vicinity of the photosensitive body and exposing device for adhering a toner onto electrostatic latent images. The charging device 302 is spaced to the developing station by a distance smaller than the breadth of the cooling assembly 306.
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