Patents by Inventor Alan R. Henderson
Alan R. Henderson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5621551Abstract: An LCLV projection system (10) includes color separation dichroic mirrors (50, 52) positioned between a group of reflective liquid crystal light valves (38, 40, 42) and a polarizer analyzer (26) which enables a single projection lens (34) to project all colors via a light beam of single linear polarization with a high degree of contrast, efficiency and color separation. The polarizer analyzer (26) directs a light beam with a single polarization state to a pair of dichroic filters (50, 52) which separate the beam into three different colors that are sent to three different reflective liquid crystal light valves (38, 40, 42). The light valves reflect the respective colored light beams with change in polarization state back to the dichroic mirrors (50, 52) which combine the three colors into a single combined multi-color beam that is fed through the polarizer analyzer (26) to a single system projection lens (34).Type: GrantFiled: April 30, 1993Date of Patent: April 15, 1997Assignee: Hughes-JVC Technology CorporationInventors: Alan R. Henderson, Ralph Gagnon
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Patent number: 5530489Abstract: Color separation dichroic mirrors (40,42) positioned between a group of reflective liquid crystal light valves (26,28,30) and a polarization analyzer (14) enable a single projection lens (18) to project all colors via a light beam of single linear polarization with a high degree of contrast, efficiency and color separation. The polarization analyzer (14) directs a light beam with a single polarization state to a pair of dichroic color filters (40,42) which separate the beam into three different colors that are sent to three different reflective liquid crystal light valves (26,28,30). The light valves reflect the respective colored light beams with change of polarization state back to the dichroic mirrors (40,42) which combine the three colors into a single combined multi-color beam that is fed through the polarization analyzer (14) to a single system projection lens (18).Type: GrantFiled: October 5, 1994Date of Patent: June 25, 1996Inventors: Alan R. Henderson, Christopher S. Sexton
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Patent number: 5398082Abstract: A video projection system employs a reflective light valve (10) that is optically addressed by an image from a cathode ray tube (12) and provides an output image for projection by means of a high intensity reading light directed to the output face of the liquid crystal light valve. Improved reading illumination is provided by scanning the face of the liquid crystal light valve (10) with a narrow beam of light (80) that moves across the liquid crystal in synchronism with the scanning image from the writing CRT (12). The scanned narrow band (80) of illumination is provided by a circular sequence of three quasi cylindrical lens (56, 58, 60) or mirrors (56a, 58a, 60a) mounted on a rotating wheel (52) and which may be made of sequentially different colors to provide a color display. Rotation of the lens or mirror bearing wheel (52) is synchronized with the vertical sync of the CRT scan, as are the index positions of each of the three lens or mirror segments on the wheel.Type: GrantFiled: May 20, 1993Date of Patent: March 14, 1995Assignee: Hughes-JVC Technology CorporationInventors: Alan R. Henderson, Richard M. Filia
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Patent number: 5057747Abstract: Arc lamp output stability is improved by use of negative feedback which stabilizes arc position and intensity. Position and intensity of an image of the arc are sensed by optical sensors to control electromagnets which shift arc position so as to decrease wander and to control lamp current to decrease arc intensity variation.Type: GrantFiled: November 21, 1988Date of Patent: October 15, 1991Assignee: Hughes Aircraft CompanyInventor: Alan R. Henderson
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Patent number: 4999703Abstract: A system for automatically achieving convergence of the individual color images emitted by a color projector (11). The system employs a test pattern generator (71) which generates a number of test patterns which are identical for each CRT of the projector (11). The test patterns are scanned across a light sensor (83) which produces an output signal each time a portion of the test pattern crosses the sensor (83). The output signal causes a scanner processor (91) to latch the positions at which respective crossings are detected. The differences in position of the respective test patterns at each location examined by the sensor (83) represents misconvergence of the individual color images at the respective location. These differences are determined and interpolated by an image processor (61) and stored in a memory (63) to generate correction signals for correcting the misconvergence.Type: GrantFiled: December 23, 1988Date of Patent: March 12, 1991Assignee: Hughes Aircraft CompanyInventor: Alan R. Henderson
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Patent number: 4779285Abstract: A multiple cavity waveguide laser is formed of a pair of face to face contiguous dielectric blocks 70, 72, in the facing surfaces of which are formed pairs of mating waveguide grooves 78, 80, 82, 84, having an electrode partition 92 sealed to and between the adjacent mating blocks to separate one pair of waveguide cavities from another, thereby forming four closely spaced waveguide cavities. In another embodiment, the partition 26 between the two dielectric blocks 10, 12 is thin conductive material, and dielectric partitions 36, 38 are provided between cavities of each pair in a single dielectric block. The internal surfaces 40, 42, 44, 46 of each cavity opposite the common electrode 26 are plated with an electrically conductive material, and suitable electrical connections 56, 58, 18 are made from the internal electrodes to the exterior of the blocks.Type: GrantFiled: November 23, 1987Date of Patent: October 18, 1988Assignee: Hughes Aircraft CompanyInventor: Alan R. Henderson
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Patent number: 4751715Abstract: A multiple cavity waveguide laser is formed of a pair of face to face contiguous dielectric blocks 70, 72in the facing surfaces of which are formed pairs of mating waveguide grooves 78, 80, 82, 84having an electrode partition 92 sealed to and between the adjacent mating blocks to separate one pair of waveguide cavities from another, thereby forming four closely spaced waveguide cavities. In another embodiment, the partition 26 between the two dielectric blocks 10, 12 is thin conductive material, and dielectric partitions 36, 38 are provided between cavities of each pair in a single dielectric block. The internal surfaces 40, 42, 44, 47 of each cavity opposite the common electrode 26 are plated with an electrically conductive material, and suitable electrical connections 56, 58, 18 are made from the internal electrodes to the exterior of the blocks.Type: GrantFiled: September 30, 1986Date of Patent: June 14, 1988Assignee: Hughes Aircraft CompanyInventor: Alan R. Henderson
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Patent number: 4669042Abstract: An up-down counter is fed pulses generated manually and/or automatically from either or any of two or more command sources. Gating circuitry ahead of the up-down counter may be used to enable counts from only one source at a time. The output of the counter represents the magnitude of the parameter to be controlled. The purpose is to transfer control of a parameter to any of several command sources without changing the value of the parameter, thereby achieving "stepless" switching. Only one counter is needed regardless of the number of command sources, no synchronizing circuitry is required, and switching is provided with no steps or delays. Multiple command sources may be active simultaneously when command source input gating is not used ahead of the up-down parameter magnitude counter.Type: GrantFiled: July 10, 1985Date of Patent: May 26, 1987Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Alan R. Henderson, John P. Sheppard
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Patent number: 4127796Abstract: Damage to the phosphorescent screen of a cathode ray tube (CRT) by an electron beam is minimized by preventing the display of a stationary image on the screen. This is accomplished by superimposing or adding to each of the normal electron beam deflecting voltages an additional triangular offset waveform, with the combined effect of the offset waveforms being to constantly move the entire electron scan pattern over an infrequently recurring path at a slow enough rate to be imperceptible to the viewer.Type: GrantFiled: May 23, 1977Date of Patent: November 28, 1978Assignee: Hughes Aircraft CompanyInventor: Alan R. Henderson
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Patent number: 4068384Abstract: In accordance with one disclosed embodiment, a continuous steel belt passed around two pulleys which are disposed so that the belt is in contact with a magnetic strip bonded to the surface of a conveyor. A rotary measuring device, such as photoelectric encoder, is attached to the shaft of one of said pulleys and the output signals from the encoder provide an accurate measurement of the linear travel of the conveyor.Type: GrantFiled: November 12, 1976Date of Patent: January 17, 1978Assignee: Hughes Aircraft CompanyInventors: Josef K. Holy, Alan R. Henderson