Patents Examined by Eric F. Chatmon
  • Patent number: 5008530
    Abstract: An autocollimation light curtain comprises a light source which directs a light beam onto a scanning device which scans the light beam so that it is continuously displaced parallel to itself, thus forming a light curtain which is directed through a monitoring region. A reflector is provided at the end of the monitoring region and is subdivided in the scanning direction into a plurality of fields of two types which alternate with each other. Light reflected at the reflector is directed back to a light receiving system comprising first and second photodetectors. The two types of fields of the reflector have characteristics which influence the spectral range and/or the state of polarization of the incident light. In the light receiving arrangement one photoreceiver is filtered so that it receives only light reflected from the one type of field, but not light from the other type of field, whereas the other photoreceiver responds to all the light reflected back from the reflector.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: April 16, 1991
    Assignee: Erwin Sick GmbH Optik-Elektronik
    Inventor: Hans-Klaus Ball
  • Patent number: 4891529
    Abstract: A can top measuring system is disclosed, including a rotatable turntable (40) containing can top receiving apertures (44). The turntable (40) may also be translated in either the X or Y direction. A differential height sensor (50) surrounds the can top (70) in order that two laser ranger finders (51,52) may emit beams toward opposite sides of the can top (70), the reflected beams being sensed by two dimensional detector arrays (58, 60). Height measurements can also be accomplished by an autofocusing optical system (28) movable along the Z axis. A score line (76) depth in the can top (70) may be measured by observing the characteristic sinusoidal variation (94) of a beam (93) scanned transversely across the score line (76). A node (96) resides on the score line (76) centerline (95), which can thus be scanned as reprsentative of the deepest portion (91) of the score line (76).
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: January 2, 1990
    Assignee: View Engineering, Inc.
    Inventors: Paul A. Braun, Michael W. Ormsby, Gary L. De Zotell
  • Patent number: 4886977
    Abstract: A photoelectric converter comprising a photoelectric conversion unit which includes a pair of main electrodes, spaced by a photoreception area over a semiconductor layer, and an auxiliary electrode. The semiconductor layer and the auxiliary electrode are laminated through the intermediary of an insulating layer in at least the photoreception area. It also includes a storage capacitor for storing electric charges flowing through the photoelectric conversion unit, a transfer transistor for transferring the charges stored in the capacitor, a discharge transistor for discharging the charges stored in the storage capacitor, and dividing device for dividing a switching voltage applied to the control electrode of the discharge transistor to apply a divided voltage to the auxiliary electrode.
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: December 12, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ihachiro Gofuku, Yoshiyuki Osada, Katsumi Nakagawa, Katsunori Hatanaka, Toshihiro Saika, Noriyuki Kaifu
  • Patent number: 4880992
    Abstract: A non-contacting measuring system, particularly for industrial robots, for acquiring the position of two coordinate systems, comprising sensors, in particular a stationary coordinate system lying in a measuring plane and of a moving coordinate system, particularly for the acquisition of absolute position and repetitive accuracy of industrial robots, comprises a bipartite measuring system including a precision turn table with a precision sensor comprising a distance sensor and an optical sensor and a planar measuring subject lying in the measuring plane. The distance from the measuring plane and the tilt about the x axis and the y axis are calculated from the distance sensor signals. The rotation about the z axis and the displacement in the x direction and the y direction are calculated by sensing a line pattern.
    Type: Grant
    Filed: June 6, 1988
    Date of Patent: November 14, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erich Niedermayr, Robert Griessbach
  • Patent number: 4877970
    Abstract: A process for measuring the contour configuration of an article defined by numerous cylindrical surface portions, is disclosed, which process comprises placing the article on a turntable, irradiating parallel light beams upon one side portion of the article while rotating the turntable, detecting changes, as a function L(.theta.) by means of a light-receiving member, in locations L at which the parallel light beams are interrupted by the article, said .theta. denoting a rotational angle of the turntable, inputting data of L(.theta.) thus detected into a memory of a computer, calculating a value of L(.theta.)+L(.theta.180.degree.), comparing the thus calculated value with that for an ideal contour configuration, and correcting deviations in a position and angle of the article. Thereby, a correct measured value is obtained.
    Type: Grant
    Filed: September 13, 1988
    Date of Patent: October 31, 1989
    Assignee: NGK Insulators, Ltd.
    Inventors: Masayasu Minamikawa, Yoshiaki Onabe, Masanao Ono
  • Patent number: 4877952
    Abstract: This invention is an optical memory device in which data is written, stored and read out in optical form without any conversion to electronics. The functions performed such as readout, reset and the like can be via electronic means, optical means, or a combination of both. The inherent bistability/hysteresis which is required for the memory function is obtained with a laser structure which includes a saturable absorber and, as a portion of the cavity, a waveguide.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: October 31, 1989
    Assignees: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Thirumala R. Halemane, Steven K. Korotky
  • Patent number: 4876445
    Abstract: An intrusion detection device which has an optically extended field of view substantially greater than 180 degrees is disclosed. The intrusion detection device includes a radiation sensor and an optical system for concentrating radiation onto the sensor from each of a plurality of discrete fields of view extending over a predetermined arc greater than 180 degrees. A lens system has a plurality of segments each with its own field of view. Reflectors within the field of view of each of a plurality of the lens segments are oriented to gather radiation from a predetermined field of view outside the field of view of the lens system and to reflect the gathered radiation onto the associated lens segment to be concentrated onto the sensor.
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: October 24, 1989
    Assignee: Nvtek Security Products, Inc.
    Inventor: Richard L. McMaster
  • Patent number: 4874940
    Abstract: A method and apparatus for inspecting the bottom of a transparent container for defective conditions, such as internal stuck glass, internal loose glass or foreign material. The container is provided in an inspection zone and a linearly extending line of light from a light source is focused to pass through the container bottom with the line of light extending the length of the inspection zone and hence the length of the container bottom. The linearly extending line of light enters the container through the exterior surface of the container bottom. The intensity of the light reflected from defects in or within the container and through the container side wall at a predetermined angle is detected. The detected intensity of the reflected light is compared with a predetermined threshold value that provides a measure of the acceptability of the container.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: October 17, 1989
    Assignee: Brockway, Inc. (N.Y.)
    Inventors: James H. McMeekin, Alan E. Lerch, Ronald S. Chollock, James F. Wesdock
  • Patent number: 4873449
    Abstract: The invention relates to process and apparatus for three-dimensional surveying by triangulation with a laser beam source. Pursuant to known practice, a laser beam scans a scene to be surveyed, by means of controlled rotary positioning of a mirror. The reflected beam is detected by a linear array of photosensitive receptors, enabling the location of the illuminated point to be determined by triangulation. Significant to the invention is the use of a secondary light source for precision measurement of the angular location of the scanning mirror, rather than relying upon controlled positioning of the mirror, which is much less accurate.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: October 10, 1989
    Inventors: Michel Paramythioti, Auguste d'Aligny
  • Patent number: 4873431
    Abstract: A control system for controlling a recording apparatus having a plurality of microcomputers, each microcomputer being formed in a single package. Each package includes an optical interface having a light-emitting device and a light-receiving device, an optical fiber cable connector attached to the package of the microcomputer, and an internal light transmission line for connecting the optical fiber cable connector to the optical interface inside the microcomputer package. Optical fiber cables for data communication are connected to the respective optical fiber cable connectors of the plurality of the microcomputers. In the control system, data vulnerable to electric noises are input through the optical interface.
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: October 10, 1989
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventor: Masazumi Ito
  • Patent number: 4871910
    Abstract: A method for measuring the size of a wire rod comprises the steps of turning a laser beam from a laser beam source into a parallel beam used for scanning, disposing a first wire rod having an unknown size and a second wire rod having an already known size larger than the diameter of the spot of the laser beam adjacent to each other in a direction of scanning with the laser beam, receiving the laser beam traversed the first and second wire rods thereby generating a corresponding electrical output signal, and calculating the size of the first wire rod on the basis of the electrical output signal.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: October 3, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Toru Ueno, Youichi Fukuoka, Seiichi Baba, Kaoru Miyoshi, Kazuto Kinoshita
  • Patent number: 4870263
    Abstract: A device for determining the contrast of a display screen as a function of the observation direction. This device comprises a first convergent objective (12) for forming the image (19) of the Fourier transform of an elementary surface (9) of a screen (6) in the image focal plane (Fi) of the first objective, a second convergent objective (14) for projecting the image of the transform on to an array (16) of detectors (18) arranged in matrix-like manner, each detector producing an electric signal proportional to the light intensity from the elementary surface in accordance with a given observation direction and a diaphragm (20) in the vicinity of the second objective and whose aperture defines a surface, which must be equal to that of the elementary surface, as well as a computer for processing the electric signal produced by each detector in order to determine said contrast.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: September 26, 1989
    Assignee: Commissariat a l'Energie Atomique
    Inventor: Jean-Claude Deutsch
  • Patent number: 4868405
    Abstract: A photoelectric converting apparatus having a plurality of photosensors and a plurality of transistors of the insulative gate type which select the signals from the photosensors and output to a signal line. Source or drain regions which are connected to the signal line are formed as a common region in a desired number of transistors, thereby reducing the wiring capacitance of the signal line.
    Type: Grant
    Filed: November 3, 1987
    Date of Patent: September 19, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenichi Nakamura
  • Patent number: 4866268
    Abstract: A fiber optic detector head senses a light reflective or transmissive pattern on an encoder disk rotated by an engine shaft. The pattern results in three different light levels which are translated by a detector into an electrical pulse train having three different voltages. Patterns encoded into the single pulse train are decoded by a microprocessor to provide specific engine cylinder or cylinder pair position information even within the first spark firing period as well as engine speed information.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: September 12, 1989
    Assignee: General Motors Corporation
    Inventors: Dah-Lain Tang, Marek T. Wlodarczyk
  • Patent number: 4866291
    Abstract: An image photosensor includes a photosensor unit a charge storage unit, and a switch unit, all of which are formed on a single-crystal semiconductor film grown from a single nucleus such that crystal formation is performed on a substrate having a free surface including a non-nucleus formation surface and a nucleus formation surface adjacent thereto. The non-nucleus formation surface has a low nucleation density. The nucleus formation surface has a sufficiently small area to allow growth of only the single nucleus and has a higher nucleation density than that of the non-nucleus formation surface.
    Type: Grant
    Filed: June 24, 1988
    Date of Patent: September 12, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Shimada, Satoshi Itabashi, Katsunori Hatanaka
  • Patent number: 4866229
    Abstract: Optical informations or data are transmitted by an essentially stationary transmitter and received by a mobile receiver attached to an operator's helmet or headset. A receiving lens and an optical wave guide lead to the operator's eye for the receiver. The optical transmitter is embodied as a projector arranged to be tiltable about its vertical axis and about a horizontal axis extending perpendicularly to the projected light beam direction. The projector further includes a tracking guide sensor and the receiver includes a reflector for establishing an optical guidance coupling between the projector and the receiver so that the projector may be appropriately pivoted to track the moving receiver.
    Type: Grant
    Filed: April 7, 1988
    Date of Patent: September 12, 1989
    Assignee: Messerschmitt-Boelkow-Blohm GmbH
    Inventor: Gottfried Scharfenberg
  • Patent number: 4864119
    Abstract: A switch using an improved method of optically-triggered avalanche breakdown which can produce pulses of 100 picoseconds or longer duration that can deliver five kilovolts into 50 ohms using a standard laser diode. A semiconductor block is provided with contacts on opposing sides across which a high-voltage less than the avalanche breakdown voltage is applied. One of the electrodes is on a mesa on one side of the block. The mesa is then irradiated with electromagnetic radiation. The wavelength of the radiation and the absorption coefficient of the semiconductor block are chosen so that the absorption depth of the majority of the radiation is less than the distance between the contacts. This results in a conduction area where absorption occurs, thus applying most of the high voltage across the distance beyond where the radiation is absorbed. This provides field compression and generates an avalanche breakdown field across the remaining distance of the semiconductor block.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: September 5, 1989
    Assignee: Power Spectra, Inc.
    Inventors: Larry O. Ragle, Stephen J. Davis, Richard A. Williams
  • Patent number: 4864150
    Abstract: A method for inspecting, detecting and distinguishing sides of fabrics by reflecting light off the fabric and measuring the intensities relatively or absolutely, of such reflected light and comparing such measurements with pre-determined calibrations or other appropriate standards of comparison, so that the fabric can be properly oriented for sewing like sides to like sides, relying on different light reflecting characteristics of the two sides of the fabric.
    Type: Grant
    Filed: February 9, 1988
    Date of Patent: September 5, 1989
    Assignee: Russell Corporation
    Inventors: Michael G. Mann, John P. Graves
  • Patent number: 4864147
    Abstract: An optically scanning displacement sensor is arranged to compute by means of a triangulation an inverse function from a first measured distance signal proportional to output position signals from a position detecting means which receiving reflected light from an object to be detected, and the first measured distance signal is multiplied at a linearity correcting means by a signal of a sum of the inverse function and a constant so as to compute a second measured distance signal, whereby a two-dimensional position detection can be realized with the least required memory capacity and the minimum adjusting process.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: September 5, 1989
    Assignees: Matsushita Electric Works, Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Motoo Ikari, Yuji Yakada, Shintaro Yamamoto, Toshimitsu Isoi, Kaoru Shirakura, Tadashi Satake, Yoshiaki Kanbe, Yasuo Ishiguro, Nobuyuki Suzuki, Yoshito Kato, Masao Kawase
  • 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