Patents Represented by Attorney Douglas A. Kundrat
  • Patent number: 4942405
    Abstract: This technique for assembling a print head for an LED printer has LED dice first assembled into precisely known locations on mounting tiles. A portion of the front face of each tile is left exposed beyond anything mounted on the tile. The tiles are then assembled with these exposed areas on a planar reference on an assembly fixture. Reference surfaces built into the fixture align the edges of the tiles, and hence the LED dice. Finally a mother plate is adhesively bonded onto the backs of the tiles. The adhesive accommodates thickness variations in the mounting tiles, and lack of flatness in the back surfaces of the tiles and the front face of the mother plate. Reference tiles copolanar with the reference plane formed by the front faces of the mounting tiles provide a z axis reference.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: July 17, 1990
    Assignee: Hewlett-Packard Company
    Inventors: Jospeh W. Dody, Richard J. Klinke, Christopher A. Lowery, Vera D. Vallentin-Price, Gary D. Sasser, William P. Sullivan
  • Patent number: 4939673
    Abstract: A method and apparatus for enhanced line endpoint positioning in an analog vector display, for use in high resolution color film recording and other high resolution imaging processes associated with computer generated graphics.
    Type: Grant
    Filed: June 7, 1989
    Date of Patent: July 3, 1990
    Assignee: Hewlett-Packard Company
    Inventors: Paul R. Hanau, M. David Blythe
  • Patent number: 4939375
    Abstract: A solid state relay uses an optically controlled shunt and series enhancement circuit between a photodiode array and an output device to provide enhanced turn-off and transient immunity characteristics. A Faraday shield may be used to cover optically active components and to provide protection against false turn-on and turn-off caused by the transients.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: July 3, 1990
    Assignee: Hewlett-Packard Company
    Inventors: Michael D. Walters, Joseph Pernyeszi, John F. Petrilla
  • Patent number: 4925273
    Abstract: A variable optical attenuator includes incoming and outgoing surfaces which are inclined relative to each other so that light reflected at an attenuating coating on one or both surfaces is reflected away from the optical path to avoid interference effects. The attenuating coating varies in density depending upon the angle of rotation of the attenuator. Variable attenuation may be achieved by rotating the attenuator a predetermined amount under microprocessor control.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: May 15, 1990
    Assignee: Hewlett-Packard Company
    Inventors: Bernd Maisenbacher, Siegmar Schmidt
  • Patent number: 4904862
    Abstract: A print head for a light emitting diode printer has a row of LEDs on a mother plate and an end mounting plate secured at each end of the mother plate. A linear lens array is positioned over the LEDs. The optical elements of the print head are adjusted by mounting these components in a fixture having an optical image analyzer for analyzing the quality of image from an individual LED projected onto the face of the analyzer. The total conjugate or spacing between the row of LEDs and the image analyzer is adjusted for maximizing image quality. One end of the lens array between the LEDs and analyzer is adjusted for maximizing the quality of an image of an LED on the optical analyzer. The spacing of the second end of the lens array is then adjusted for maximizing the quality of an image of an LED near the other end of the row. The adjustment steps may be repeated for optimizing the LED images. After adjustment, the position of the lens array is locked in the end mounting plates.
    Type: Grant
    Filed: January 19, 1989
    Date of Patent: February 27, 1990
    Assignee: Hewlett-Packard Company
    Inventor: Michael G. Bertagne
  • Patent number: 4902883
    Abstract: A bar code reader comprises a smart scanner with a processor that can be configured to send to the host either (a) the digitized video signal from the scanner's optical section, (b) the unprocessed time interval data measured from the transitions of the video signal, (c) the decoded data message, or (d) the combination of (b) and (c).
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: February 20, 1990
    Assignee: Hewlett-Packard Company
    Inventor: Mckee D. Poland
  • Patent number: 4902901
    Abstract: A high-power solid state relay uses optically-controlled shunt and series solid state switches between a photodiode array and an output device to provide enhanced turn-off and transient immunity characteristics and an optically-controlled charging network connected to the switched load to enhance the turn-on characteristics of the relay.
    Type: Grant
    Filed: April 14, 1989
    Date of Patent: February 20, 1990
    Assignee: Hewlett-Packard Company
    Inventor: Joseph Pernyeszi
  • Patent number: 4863806
    Abstract: An optical isolator is fabricated upon a lead frame having an LED section which is rotated 180.degree. to position the LED over the photodiode. Prior to rotation both the LED and the photodiode attachment portions of the leads are down set a predetermined amount to fix the size of the isolation gap between the LED and the photodiode. Dielectric sheets are attached to the outer surfaces of the LED and photodiode leads and an optically transmissive resin is injected therebetween to form a light guide and to encapsulate the LED and photodiode dice and their associated bond wires. In an alternate embodiment a sheet is attached to the outer surface of one lead and a dielectric sheet thereagainst is positioned at a tilted angle between the LED and the photodiode.
    Type: Grant
    Filed: July 21, 1987
    Date of Patent: September 5, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Stephen P. Merrick, Robert W. Teichner
  • Patent number: 4864126
    Abstract: A solid state relay uses an optically controlled shunt and series enhancement circuit between a photodiode array and an output device to provide enhanced turn-off and transient immunity characteristics. A Faraday shield may be used to cover optically active components and to provide protection against false turn-on and turn-off caused by the transients.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: September 5, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Michael D. Walters, Joseph Pernyeszi, John F. Petrilla
  • Patent number: 4853877
    Abstract: A plotter continuously performs a dynamic sort on incoming vectors to be plotted and stores the sorted vectors by color in bins within a memory. At the same time that the sort is being performed, the plotter selects the bin containing the most vectors and plots all of the vectors from that bin before selecting another bin.
    Type: Grant
    Filed: November 1, 1988
    Date of Patent: August 1, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Anthony D. Parkhurst, Thomas J. Halpenny
  • Patent number: 4818067
    Abstract: A fiber optic focusing device allows fine adjustment of the focal point along the optical axis without causing tilting of the focusing lens system. Roughly perpendicular setscrews engaging opposing inclined surface urge the lens system along the optical axis.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: April 4, 1989
    Assignee: Hewlett-Packard Company
    Inventors: Bernd Maisenbacher, Rudolf Vozdecky
  • Patent number: 4794250
    Abstract: A modular optical encoder includes a housing, a rotatable cam-loaded cover, an emitter/detector module and a code wheel which is positionable upon the shaft of a motor. The code wheel is positioned automatically against the cover during attachment of the encoder to the motor to set the desired emitter and detector gaps. Once the code wheel is locked to the shaft, the cover may be rotated to disengage the cams and followers so that the code wheel is free to turn with the motor shaft.
    Type: Grant
    Filed: February 27, 1987
    Date of Patent: December 27, 1988
    Assignee: Hewlett-Packard Company
    Inventor: Chris K. Togami
  • Patent number: 4759603
    Abstract: An array of light guides having limited internally reflective wall surfaces allows projection of an array of tightly defined light spots with minimal cross talk between spots. The walls are fabricated from an optically absorptive material and the wall surfaces have an index of refraction which is greater than the index of refraction of the guide channel medium. The dimensions of the array are such that light from an emitter propagates through the channel associated with that emitter while light entering that channel from another emitter is absorbed within the channel walls.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: July 26, 1988
    Assignee: Hewlett-Packard Company
    Inventor: Carolyn F. Jones
  • Patent number: 4713782
    Abstract: A transfer function analyzer measures the real and imaginary parts of the Fourier transform of a stimulus signal applied to a device and of a resulting response signal. The integration which is performed as part of the Fourier transformation is performed as a summation of a central sector of discrete data points within the period of integration plus the products of the coefficients of weighting polynomials multiplied by preceding and succeeding sectors of data points beyond the central sector. An accurate integration is obtained whether or not the period of integration begins or ends upon discrete data points.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: December 15, 1987
    Assignee: Hewlett-Packard Company
    Inventor: Ray Blackham
  • Patent number: 4694244
    Abstract: Methods and apparatus for random repetitive sampling in digital oscilloscopes is disclosed using a psuedo-random noise generator to vary randomly the beginning of a search for a trigger event to enable the acquiring of data which has no gaps.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: September 15, 1987
    Assignee: Hewlett Packard Company
    Inventors: Laura Whiteside, Thomas K. Bohley
  • Patent number: 4694477
    Abstract: An apparatus for micropositioning an X-ray lithography mask has but a single stage plate for supporting the mask, three piezoelectric transducers for moving the stage plate in the X-Y plane, and three flexure assemblies located equiangularly around the stage plate for supporting the stage plate and for moving the stage plate in the Z-axis. The flexure assemblies each include a single piezoelectric transducer and various flex strips to allow relative motion of the stage plate to occur smoothly in all six of the possible degrees of freedom.
    Type: Grant
    Filed: December 21, 1983
    Date of Patent: September 15, 1987
    Assignee: Hewlett-Packard Company
    Inventor: Graham J. Siddall
  • Patent number: 4694183
    Abstract: An optical isolator is fabricated upon a lead frame having an LED section which is rotated 180.degree. to position the LED over the photodiode. Prior to rotation both the LED and the photodiode attachment portions of the leads are down set a predetermined amount to fix the size of the isolation gap between the LED and the photodiode. Dielectric sheets are attached to the outer surfaces of the LED and photodiode leads and an optically transmissive resin is injected therebetween a form a light guide and to encapsulate the LED and photodiode dice and their associated bond wires. In an alternate embodiment a sheet is attached to the outer surface of one lead and a dielectric sheet thereagainst is positioned at a tilted angle between the LED and the photodiode.
    Type: Grant
    Filed: June 25, 1985
    Date of Patent: September 15, 1987
    Assignee: Hewlett-Packard Company
    Inventors: Stephen P. Merrick, Robert W. Teichner
  • Patent number: 4691101
    Abstract: An optical shaft encoder has a light detector configuration that includes the function of a phase plate. The light detectors are one-half the width of a code wheel transmissive section and are arranged in groups of four so that each group corresponds to one pitch of the code wheel. The light detectors are interdigitated such that they are adjacent to one another and receive information from two channels. One light beam illuminates the four light detectors producing four electrical signals. The physical layout of the light detectors causes the output signals to be phase shifted 90.degree. from each other. These signals are combined electronically in pairs forming quadrature push pull signals.
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: September 1, 1987
    Assignee: Hewlett-Packard Company
    Inventor: Mark G. Leonard
  • Patent number: 4679167
    Abstract: The individual RAMs comprising the memory space of a computer are automatically located within a memory space during initialization and address enable information is stored in ID-RAMs on each RAM card. Shift registers on the RAM cards are connected in series and during initialization an ID bit is serially clocked through the shift registers. At each clock pulse the contents of the shift registers are written to the ID-RAMs of each RAM card. The presence of an ID bit at a specific memory location in an ID-RAM on a RAM card indicates that that card is to be enabled when the memory location address is accessed; the location of the ID bit within the memory location indicates the particular RAM on the RAM card to be accessed.
    Type: Grant
    Filed: July 29, 1983
    Date of Patent: July 7, 1987
    Assignee: Hewlett-Packard Company
    Inventor: James S. Finnell
  • Patent number: 4658367
    Abstract: A pole and zero analyzer determines the poles and zeroes of a device for applying a stimulus signal to the device, detecting the stimulus and response signals and computing the auto- and cross spectra. An estimated transfer function is least squares fit to a measured transfer function obtained from the auto- and cross-spectra and the poles and zeroes are obtained as the roots of the estimated transfer function. Inaccuracies due to noise are minimized by subtracting out a noise bias from the squared cross-spectrum obtained during the least squares fit and by orthogonalizing a data matrix used in the determination of the coefficients of the estimated transfer function.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: April 14, 1987
    Assignee: Hewlett-Packard Company
    Inventor: Ronald W. Potter