Optical Patents (Class 341/13)
  • Patent number: 10263664
    Abstract: Embodiments of the present invention provide a signal transmission method. The method includes: sequentially rotating phases of to-be-sent signals on a line set 1 by different angles and in relative to phases of to-be-sent signals on a line set 2, and sequentially sending, to a user side, the to-be-sent signals whose phases are rotated. The method also includes receiving a rotation factor that is of a high-quality received signal on the line set 1 and that is fed back by the user side, where the high-quality received signal includes a received signal with a high signal-to-noise ratio or high power. The method also includes using the rotation factor fed back by the user side as a fixed rotation factor, and rotating, according to the fixed rotation factor, a phase of a signal to be subsequently sent on the line set 1.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: April 16, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Fanglin Sun, Bin Zhou, Shicai Chen
  • Patent number: 9939496
    Abstract: A sensor system is disclosed. The sensor system includes a first sensor path comprising a first sensing element and a second sensing element being connected in series between a first supply terminal and a second supply terminal and an intermediate node connected in between the first supply terminal and the second supply terminal, a second sensor path comprising a third sensing element and a fourth sensing element connected in series between the first supply terminal and the second supply terminal, a first reference node connected in between the first supply terminal and the second supply terminal, and a second reference node connected in between the first supply terminal and the second supply terminal, and a processing unit to receive an input signal from the intermediate node, a first reference signal from the first reference node, and a second reference signal from the second reference node.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: April 10, 2018
    Assignee: NXP B.V.
    Inventors: Edwin Schapendonk, Pieter Van Der Zee, Fabio Sebastiano, Robert Van Veldhoven
  • Patent number: 9914239
    Abstract: A user interface device for a saw is mounted to an exterior of a housing in the saw. The user interface device includes a light emitting diode (LED) mounted on a printed circuit board (PCB), an antenna formed on the PCB, an optically opaque member with a first opening and a second opening, the first opening aligned with the LED, an optically translucent member engaging the second opening of the optically opaque member, and a base member connected to the PCB, optically opaque member, and optically translucent member, the base member being configured to be mounted to an exterior of a housing of the saw.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: March 13, 2018
    Assignees: Robert Bosch Tool Corporation, Robert Bosch GmbH
    Inventors: Eric Laliberte, Timothy Szweda, Dieter Volpert
  • Patent number: 9894292
    Abstract: Apparatus for increasing resolution of cryogenically cooled vacuum-sealed infrared imaging detector. A two-dimensional detector array of photosensitive pixels is successively exposed to an image scene, acquiring multiple imaging samples. A masking filter, disposed between the detector array and image scene focal plane, is maintained at a fixed position with respect to the detector array, and reduces the region of pixels collecting incident radiation for each imaging sample such that only a portion of each pixel area of the image scene is imaged onto the corresponding detector array pixel. Shifting means successively shifts the optical path of the image scene relative to the masking filter, by a shifting increment or fill-factor reduction amount equal to a fraction of the array pixel width, to image different sub-pixel regions in each imaging sample. A processor reconstructs an image frame having a resolution greater than the intrinsic detector resolution by the fill-factor reduction amount.
    Type: Grant
    Filed: May 5, 2013
    Date of Patent: February 13, 2018
    Assignee: ELBIT SYSTEMS ELECTRO-OPTICS ELOP LTD.
    Inventors: Shalom Binder, Dov Frieman, Avishay Nachum
  • Patent number: 9654752
    Abstract: A new framework for video compressed sensing models the evolution of the image frames of a video sequence as a linear dynamical system (LDS). This reduces the video recovery problem to first estimating the model parameters of the LDS from compressive measurements, from which the image frames are then reconstructed. We exploit the low-dimensional dynamic parameters (state sequence) and high-dimensional static parameters (observation matrix) of the LDS to devise a novel compressive measurement strategy that measures only the dynamic part of the scene at each instant and accumulates measurements over time to estimate the static parameters. This enables us to lower the compressive measurement rate considerably yet obtain video recovery at a high frame rate that is in fact inversely proportional to the length of the video sequence. This property makes our framework well-suited for high-speed video capture and other applications.
    Type: Grant
    Filed: June 18, 2011
    Date of Patent: May 16, 2017
    Assignee: William Marsh Rice University
    Inventors: Richard G. Baraniuk, Aswin C. Sankaranarayanan
  • Patent number: 9651403
    Abstract: Provided are an absolute position measurement method, an absolute position measurement apparatus, and a scale. The scale includes a scale pattern formed by replacing repeatedly arranged pseudo-random-codes with a sequence of a linear feedback shift register of N stages using a first symbol with first width representing a first state and a second symbol with second width representing a second state. The first is divided into two or more first symbol areas of different structures, and the second symbol is divided into two or more second symbol areas of different structures. There is at least one overlap area in which the first symbol and the second symbol overlap each other to have the same structure.
    Type: Grant
    Filed: November 13, 2014
    Date of Patent: May 16, 2017
    Assignee: Korea Research Institute of Standards and Science
    Inventors: Jong-Ahn Kim, Jae-Wan Kim, Tae-Bong Eom, Chu-Shik Kang, Jong-Han Jin
  • Patent number: 9307125
    Abstract: Provided is a position detection device including a detection unit configured to have a photo-reflector including a light emitter and a light receiver, the light receiver receiving light emitted from the light emitter and reflected by a reflective surface moved in a predetermined direction, the detection unit detecting a movement amount of the reflective surface based on a change in intensity of the received light, and a transparent member configured to be disposed between the reflective surface and the detection unit and to move together with the reflective surface, the transparent member being provided with a light blocking surface configured to block light and a light transmitting surface configured to transmit light, the light blocking surface and the light transmitting surface being arranged in a moving direction of the reflective surface.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: April 5, 2016
    Assignee: Sony Corporation
    Inventors: Soichiro Katsumata, Takashi Koyama, Shuhei Kaneko
  • Patent number: 9164638
    Abstract: The disclosure discloses an information processing method for an electronic device with a touch screen. The method includes: touch with a touch screen is detected; an information pickup area is set on the touch screen according to the touch; and information in the information pickup area is picked up according to an information pickup command and the picked-up information is stored. In the disclosure, existing information, such as an image or a signature, is picked up via an information processing device, such as a stylus, on a touch screen of an electronic device; and a user can autonomously control its image, signature and other information to display on the touch screen of the electronic device when needed. Therefore, great convenience is brought to users using a portable electronic device such as a tablet PC and a smart phone, and their personalized application can also be met to a great extent.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: October 20, 2015
    Assignee: ZTE Corporation
    Inventors: Wen Fang, Feng Guo
  • Patent number: 9121731
    Abstract: An encoder includes a scale that includes a pattern row, a detector array, and a signal processor. The pattern row has a plurality of different modulation periods in the moving direction, an amplitude of the energy distribution in the pattern having at least one modulation period being configured to change with a position of the scale in the moving direction. The signal processor acquirers an amplitude of an energy distribution of a corresponding modulation period based on an output signal from the detector array, and an amplitude signal obtained by normalizing a plurality of amplitudes obtained by the plurality of amplitude acquirers, the amplitude signal serving as a position signal representative of the position of the scale.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: September 1, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Haruhiko Horiguchi, Chihiro Nagura
  • Patent number: 9041386
    Abstract: A linear position measuring system (10) and a method for determining a position of a carriage in relation to a slide rail (12), with an incremental scale (14) placed along the slide rail (12) and a scanner secured to the slide scale. The scanner is designed to scan a plurality of incremental markings along the incremental scale (14), wherein the incremental markings can be scanned as an essentially analog signal progression. The scanner is designed to scan the incremental markings with a variable scanning frequency. The scanning frequency can be adaptively varied in relation to a currently acquired frequency of the analog signal progression, wherein the variable scanning frequency measures at least twice the currently acquired frequency of the analog signal progression.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: May 26, 2015
    Assignee: SCHNEEBERGER HOLDING AG
    Inventor: Klaus-Dieter Goetz
  • Patent number: 9036285
    Abstract: A position detection encoder includes a scale and a detection head and has position detection circuits which are capable of outputting respective pieces of position information on Xf, Xs two tracks. The displacement detection encoder includes: a speed detection circuit which is provided in the detection head and detects a relative speed Xf, Xs relative to the scale; and a delay generation circuit which provides a time difference between two output request signals, the time difference being provided on the basis of a fine adjustment time tadj based on the relative speed Xf, Xs and the respective pieces of position information Xf, Xs on the two tracks, the output request signals St1, St2 urging the first and second position detection circuits to output the pieces of position information on Xf, Xs the two tracks.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: May 19, 2015
    Assignee: MITUTOYO CORPORATION
    Inventor: Yoshiaki Kato
  • Patent number: 9030194
    Abstract: A scanning device for a position encoder is provided that comprises a plurality of sensor elements for generating a plurality of sensor signals. A summation unit is also provided for generating at least a first summation signal and a second summation signal that provide information on the relative alignment of the scanning device and an associated scale. The first summation signal is generated from a first subset of the plurality of sensor signals and the second summation signal is generated from a second subset of the plurality of sensor signals. The plurality of sensor elements are substantially evenly spaced apart from one another N and sensor elements are provided per period of an associated scale, wherein N is an integer value and a multiple of three and four. In this manner, the third harmonic contribution to the summation signals is suppressed.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: May 12, 2015
    Assignees: RLS Merilna Tehnika D.O.O., Renishaw PLC
    Inventor: Gregor Dolsak
  • Patent number: 8993955
    Abstract: The encoder includes a scale including first and second periodic patterns, and a detector relatively movable with respect to the scale and whose detection state is switchable between a first detection state to read the first periodic pattern and output a first signal and a second detection state to read the second periodic pattern and output a second signal. A processor performs a first process to detect a first absolute position by using the first and second signals and then performs a second process to calculate a relative movement amount by using a specific signal that is one of the first and second signals and detect a second absolute position by using the relative movement amount and the first absolute position. The specific signal is obtained from the detector set in a same detection state as that set last in the first process.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: March 31, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hitoshi Nakamura, Chihiro Nagura
  • Patent number: 8969789
    Abstract: A signal output unit generates an A phase output signal of a rectangular wave and a B phase output signal of a rectangular wave from the A phase sinusoidal wave signal and the B phase sinusoidal wave signal, respectively and outputs the generated signals. An internal signal generating unit (comparator) generates an A phase internal signal of a rectangular wave and a B phase internal signal of a rectangular wave from the A phase sinusoidal wave signal and the B phase sinusoidal wave signal, respectively, which are further processed by counters, and an abnormality detector. Each counter resets in response to a pulse edge of a signal for detection. The abnormality detector detects an abnormality when the count value of at least one of counters reaches a prescribed value.
    Type: Grant
    Filed: February 26, 2013
    Date of Patent: March 3, 2015
    Assignee: OMRON Corporation
    Inventors: Toshinori Sato, Akihiko Morikawa, Takao Ushiyama, Junichi Ueno
  • Patent number: 8922404
    Abstract: An aspect of one embodiment, there is provided a signal processor includes an AD-convertor outputting a conversion result and a conversion end flag, a second comparator configured to compare signal levels, a channel selection signal generation unit to select an input channel to input the AD-convertor, an direction identification flag generation unit to generate an direction identification flag, an edge signal generation unit to generate rising edges and lowering edges, an up-down counter to subject to be up or down on a count value in an output of each of edge signals, and an arithmetic processing unit to interlink the count value of the up-down counter and the conversion result of the AD-convertor to generate output data, wherein the arithmetic processing unit interpolates the count value of the up-down counter in the interlinking by using a correction value corresponding to a value of the direction identification flag in a period between an output of the edge signal and an output of the conversion end flag.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: December 30, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroshi Ariga
  • Patent number: 8878125
    Abstract: Provided herein is an encoder including a position detecting device provided with a gear mechanism and an optical encoder device. A housing includes a bearing holder provided between a first housing portion and a second housing portion of the housing. The bearing holder serves as a partition wall portion configured to separate the gear mechanism from the optical encoder device. If the gear mechanism is separated from the optical encoder device, abrasion powder or grease can be reliably prevented from scattering from the gear mechanism to adhere to constituent parts of the optical encoder device.
    Type: Grant
    Filed: July 13, 2012
    Date of Patent: November 4, 2014
    Assignee: Sanyo Denki Co., Ltd.
    Inventors: Tooru Miyajima, Toshiaki Ayuzawa, Yoshihiro Shoji
  • Patent number: 8847144
    Abstract: An optical encoder and optical encoding system are disclosed. Specifically, an encoder having a light detector elevated relative to a light source is described. The relative height difference between the light source and the light detector enables the optical encoder to minimize noise at the light detector without requiring a separate light baffle between the light source and light detector. Methods of manufacturing and operating such an encoder are also described.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: September 30, 2014
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Yik-Foong Soo, Weng Fei Wong, Wee Jin Yeap
  • Patent number: 8847145
    Abstract: Method for working out the angular position of a rotating element, using at least one light source emitting a light beam in the direction of a fixed sensor and computing elements for processing an output signal of the sensor, includes: arranging the light source with respect to the rotating element and the sensor so as to induce an interaction between the light beam and the sensor which depends on the angular position of the rotating shaft, arranging on the path of the light beam, in a fixed position with respect to the sensor, a perforated mask which presents a repetitive pattern of perforations, detecting shadows generated by the mask on the sensor, processing the output signal of the sensor for determining the position of the shadows on the sensor, and computing the angular position of the rotating element using the position of the shadows.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: September 30, 2014
    Assignee: CSEM Centre Suisse d'Electronique et de Microtechnique SA—Recherche et Developpement
    Inventor: Peter Masa
  • Patent number: 8829421
    Abstract: An optical encoder includes: an optical scale having periodical optical patterns and can be relatively and angularly displaced; a projector for irradiating the optical scale with light; a light receiver for receiving light from the optical scale; and a calculator for calculating an absolute rotation angle ? of the optical scale in accordance with a signal from the light receiver. The optical patterns include a plurality of light shielding portions and a plurality of light transmitting portions, each of the portions being located alternately.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: September 9, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Noguchi, Hajime Nakajima, Takeshi Musha, Yoshinao Tatei, Takashi Hirai
  • Patent number: 8785838
    Abstract: An absolute rotary encoder comprises a scale having marks arranged at a first pitch; a first detector and a second detector including plural photoelectric conversion elements arranged at a second pitch smaller than the first pitch, and configured to detect a predetermined number of marks, the second detector disposed opposite to the first detector; and a computing device. The computing device is configured to generate a data string by quantizing a periodic signal output from the first detector, and obtains first angle data from the data string, to normalize amplitudes of the periodic signals output from the first and second detectors, to average the normalized periodic signal to obtain second angle data from a phase of the averaged periodic signal, and to combine the first and second angle data to generate data representing an absolute rotation angle.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: July 22, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ko Ishizuka
  • Patent number: 8772705
    Abstract: Disclosed are various embodiments of circuitry and methods for generating interpolated signals in an optical encoder. The optical encoder configurations and circuitry disclosed herein permit very high resolution reflective optical encoders in small packages to be provided. Methods of making and using such optical encoders are also disclosed. According to one embodiment, the interpolated signals are generated through the use of signal generation circuitry, peak voltage generation circuitry, reference voltage generation circuitry, slope detection circuitry, and a clocked comparator that is configured to output interpolated output pulses.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: July 8, 2014
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventor: Abhay Kumar Rai
  • Patent number: 8742956
    Abstract: A position encoder kit, including: a scale comprising a series of position features; and a readhead. The readhead includes a detector for receiving configuration information from a configuration item. The readhead is configured to operate in accordance with the configuration information. The readhead also includes a receiver interface via which the readhead can supply position information to a receiver.
    Type: Grant
    Filed: April 8, 2010
    Date of Patent: June 3, 2014
    Assignee: Renishaw PLC
    Inventors: Iain R. Gordon-Ingram, Andrew P. Gribble, Simon E. McAdam
  • Patent number: 8710425
    Abstract: An encoder emits modulated light from a light source section and lets a first light and a second light separated from the modulated light interfere with each other in a moving grating. In the encoder, the light emitted from the light source section is electrically modulated, and the first light and the second light have different light path lengths.
    Type: Grant
    Filed: April 20, 2011
    Date of Patent: April 29, 2014
    Assignee: Nikon Corporation
    Inventors: Susumu Makinouchi, Akihiro Watanabe
  • Patent number: 8698070
    Abstract: This invention provides a phase detector with more than two detector units on a printed circuit layer. A detector set includes a pair of detector units or one detector unit, and a detector row includes a plurality of detector sets in one line. The phase detector includes a plurality of detector rows and each row has a detector set in one period, wherein all detector units are interleaved to have the same interval between any two adjacent detector units, which is defined as a pitch and the pitch is equal to one period dividing the detector pair number, which is the half sum of the number of one detector set for all rows.
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: April 15, 2014
    Assignee: Hermes Microvision, Inc.
    Inventors: Yi-Xiang Wang, Jian Zhang
  • Patent number: 8680452
    Abstract: Methods and apparatus are provided for a control device and control device operation. In one embodiment a control device includes a slider configured to support a control knob, a rack coupled to the slider and configured to linearly displace the slider. The rack including slots. The control device may further include a drive element configured to displace the rack and position the control knob, and an optical detection module configured to detect position of the control knob based on one or more optical signals detected relative to slots of the rack. According to another embodiment, a control console is provided including control devices.
    Type: Grant
    Filed: January 7, 2011
    Date of Patent: March 25, 2014
    Assignee: QSC Audio Products, LLC
    Inventors: Greg C. Mackie, Chuck T. Jensen, Peter F. Watts
  • Patent number: 8659448
    Abstract: Provided is a rotation detection device that detects a rotational direction and amount of a rotatable operation member. The detection device manages to reduce the rotation detection pitch while maintaining sufficient clearance for a rotation detection switch to operate. In other words, sufficient distance is given between rotation detection members such that the switch can accurately detect the movement from one member to the next. The rotatable operation member generally includes a plurality of switch driving sections that rotate in unison. A rotation detection switch generally includes a portion that moves in a first and second direction opposite to each other when coming into contact with the rotatable operation members, and is configured to output a detection signal at each movement. The switch and rotatable operation members are configured so that the movement direction of the detector is in a direction orthogonal to the circumferential direction of rotation.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: February 25, 2014
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventor: Hirokatsu Nakajima
  • Patent number: 8598509
    Abstract: An optical encoder comprising a set of light sources configured to emit light rays in a serial manner, an encoded scale configured to reflect at least a portion of the emitted light rays, and a photodetector, where the photodetector is configured to detect at least a portion of the reflected light rays and to generate signals based on the detected light rays for each of the light sources.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: December 3, 2013
    Assignee: Stratasys, Inc.
    Inventor: J. Samuel Batchelder
  • Patent number: 8558721
    Abstract: Disclosed herein is a position detection apparatus including: a signal line along which a bit array including a plurality of bits used for expressing information on one of absolute positions in a direction determined in advance is created repeatedly in the direction determined in advance; and an information reading-out section which is capable of making a movement relative to the signal line in the direction determined in advance in accordance with a driving operation carried out by driving means determined in advance and is used for reading out the information expressed by the bits from the signal line.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: October 15, 2013
    Assignee: Sony Corporation
    Inventors: Hitoshi Yano, Katsuhiro Onishi
  • Patent number: 8546743
    Abstract: An encoder detects a relative displacement between an encoder scale and an encoder head. The encoder head incorporates a light source, a light-receiving element to receive light from the light source via the encoder scale, and a signal-processing circuit to process an electrical signal from the light-receiving element. The encoder has a signal detection unit, a signal discrimination unit, and a switching unit. The signal detection unit is activated selectively in accordance with setting. When activated, the signal detection unit detects one or more signals having an almost sinusoidal waveform from the encoder head. The signal discrimination unit is activated selectively in accordance with setting. When activated, the signal discrimination unit determines the waveform of one or more signals having an almost sinusoidal waveform from the signal detection unit. The switching unit switches the current to be supplied to the light source to one of various magnitudes.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: October 1, 2013
    Assignee: Olympus Corporation
    Inventor: Hiromasa Fujita
  • Patent number: 8492703
    Abstract: A method and apparatus for suppressing loss of scale image contrast due to interference effects from optical path length differences, including lens profile aberrations, are provided in a displacement sensing optical encoder that uses a telecentric imaging configuration. According to the invention, the encoder is configured such that the image light that reaches the detector comprises symmetric ray bundles concentrated symmetrically on opposite sides of the optical axis center at the limiting aperture of the telecentric imaging configuration. Central ray bundles, and/or other ray bundles that have an optical path lengths significantly different than the operational symmetric ray bundles are prevented or blocked. As a result destructive interference is prevented and image contrast is improved.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: July 23, 2013
    Assignee: Mitutoyo Corporation
    Inventors: Joseph D. Tobiason, Toru Yaku, Emi Kaneko, Eric H. Altendorf
  • Publication number: 20130176149
    Abstract: An encoder signal processing circuit is connected to encoder heads outputting an encoder signal in accordance with a relative displacement with respect to a corresponding scale in such a way that signals can be transmitted to and received from the encoder heads, and processes encoder signals from the encoder heads. The circuit includes a processing unit and a processing decision unit. The processing unit generates displacement information from the encoder signal. The processing decision unit decides at least one of content of processing for the encoder heads and content of processing on encoder signals read from the encoder heads after starting to read an encoder signal from one of the encoder heads.
    Type: Application
    Filed: March 1, 2013
    Publication date: July 11, 2013
    Applicant: OLYMPUS CORPORATION
    Inventor: OLYMPUS CORPORATION
  • Patent number: 8481915
    Abstract: An linear encoder includes: a scale; a light-emitting element that emits light onto the scale; a detecting head that has a light-receiving element that receives the light emitted by the light-emitting element to be reflected or transmitted by the scale; and a connector connected to the detecting head via a cable. The connector comprises a display that displays a status of the light received by the light-receiving element and a connector controller that controls the display. The connector controller includes a display controller that controls the display in accordance with the intensity of the light received by the light-receiving element.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: July 9, 2013
    Assignee: Mitutoyo Corporation
    Inventors: Takanori Otsuka, Michio Nakamura, Mikiya Teraguchi
  • Patent number: 8476578
    Abstract: A rotary encoder includes two first detection units disposed at positions that are symmetrical about a rotation axis, each of the first detection units outputting an incremental signal, and second detection unit that outputs an absolute signal ?A. The rotary encoder includes a storage unit that stores a plurality of formulas for correcting errors of the incremental signals, the formulas being different from each other in accordance with the signal ?A, and the errors being generated due to eccentricity; a calculation unit that calculates a corrected phase ?I by performing operation on the incremental signals by using one of the formulas corresponding to the signal ?A; and a generation unit that generates a rotation angle of the scale on the basis of the phase ?I and the signal ?A.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: July 2, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hitoshi Nakamura
  • Publication number: 20130127644
    Abstract: A scale of a photoelectric encoder includes a base member which is conductive and has a light reflection surface, and light absorptive black gratings which are arranged at a prescribed pitch on the base member.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 23, 2013
    Applicant: MITUTOYO CORPORATION
    Inventor: Mitutoyo Corporation
  • Patent number: 8426801
    Abstract: An optical sensing device includes a shell, at least one light emitting member, a rotator type shading member and at least one optical sensing member. The shell is formed with a black-body condition space having a light emitting chamber, a shading chamber and at least one optical sensing chamber. The light emitting member projects a light beam. The rotator type shading member is rotatably restrained within the shading chamber, and has a geometric center and a weight center offset from the geometric center. When the optical sensing device is lifted in a lifting azimuth or lowered in a lowering azimuth, the rotator type shading member is rotated by the geometric center to make the weight center located in the lowering azimuth with respect to the geometric center. The optical sensing member is arranged in the optical sensing chamber, and senses the light beam to accordingly send out a sensing signal.
    Type: Grant
    Filed: April 9, 2010
    Date of Patent: April 23, 2013
    Assignee: Edison Opto Corporation
    Inventors: Tsung-Ting Sun, Chung-Ping Feng, Peng-Yu Chen
  • Patent number: 8395535
    Abstract: A photoelectric encoder has a scale in which a main track for detecting an amount of movement is formed in a measuring direction. The photoelectric encoder includes an origin signal generating portion provided at a part of the main track in a direction orthogonal to the measuring direction. Thereby, change in a light receiving signal due to passage of the origin signal generating portion is detected to generate an origin signal. Thus, the origin signal which is in agreement with a main signal in phase is obtained and improve the reproducibility of an origin position.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: March 12, 2013
    Assignee: Mitutoyo Corporation
    Inventor: Hiroaki Kawada
  • Patent number: 8330098
    Abstract: Disclosed are various embodiments of a single track reflective optical encoder featuring current amplifiers disposed in the signal generating circuit thereof. Voltage amplifiers and their associated feedback resistors are eliminated in the various embodiments disclosed herein, resulting in decreased die size and improved encoder signal accuracy and performance, especially at high speeds The single track optical encoder configurations disclosed herein permit very high resolution reflective optical encoders in small packages to be provided. Methods of making and using such optical encoders are also disclosed.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: December 11, 2012
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventors: Chung Min Thor, Gim Eng Chew
  • Patent number: 8325066
    Abstract: A photoelectric encoder includes: a scale having a grating formed with a predetermined period Ps; and a detector head being movable relative to the scale and including a light source and a light receiving unit. In a configuration where light receiving elements in the light receiving unit output N-points light and dark signals (N is an integer of 3 or more), and where phases of the N-points light and dark signals are detected by a least-squares method to fit a sinusoidal function with fixed period to N-points digital signals digitized from the N-points light and dark signals, an N-points light and dark signal period P is set at an integral multiple of a data-point interval w of the N-points digital signals, and an overall length M of the light receiving elements is set at an integral multiple of the N-points light and dark signal period P. Thereby, position detecting errors occurring due to a stain of the scale and/or a defect in the grating can be reduced by simple computing.
    Type: Grant
    Filed: February 11, 2011
    Date of Patent: December 4, 2012
    Assignee: Mitutoyo Corporation
    Inventor: Yoshiaki Kato
  • Patent number: 8303199
    Abstract: A mobile device having an internal printer is disclosed. A media path is provided for receiving a print medium and a media drive mechanism transport the print medium along the media path past a printhead of the printer. An optical sensor and two separate optical pathways are also provided. The first optical pathway allows the optical sensor to image a surface of the print medium in the media path. The second optical pathway allows the optical sensor to image an area external to the mobile device.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: November 6, 2012
    Assignee: Silverbrook Research Pty Ltd
    Inventors: Paul Lapstun, Kia Silverbrook
  • Patent number: 8264380
    Abstract: A manufacturing method for a code wheel for a rotary encoder is provided. The code wheel includes, in a central portion, a hole into which a rotary shaft of a rotary member is fitted and a code portion including a radial code pattern in a circumferential edge portion. The manufacturing method is configured to include the steps of forming the code portion and a reference circle in a plate so that the reference circle has a radius larger than a radius of the hole by a tolerance of deviation between a center position of the code portion and a center position of the hole and has a same center as that of the code portion; and forming the hole in the plate in which the code portion and the reference circle are formed, so as to be contained in the reference circle.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: September 11, 2012
    Assignee: Ricoh Company, Ltd.
    Inventor: Koichi Hasegawa
  • Patent number: 8217808
    Abstract: An incremental coder in which stable positions of the coder are defined by multiples of an increment of the coder. The coder computes a difference between a binary word obtained for a current stable position and a binary word obtained for a previous stable position, and computes the value of variation of stable positions by determining the integer part of the division of the difference by the number of increments between two stable positions.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: July 10, 2012
    Assignee: Thales
    Inventors: Gregory Fazilleau, Didier Guinier
  • Patent number: 8193483
    Abstract: Disclosed are various embodiments of high-speed, high-performance, low-noise optical encoders having various means for preventing undesired stray light from reaching light detectors incorporated therein. Structures employed to block stray light in the optical encoders include light barriers, air gap trenches, and coatings disposed between first and second sides of a substrate of the encoder. Also disclosed are compact single track optical encoders having a single dome lens disposed thereover, and dual track triple dome lens optical encoders. Methods of making such optical encoders are also disclosed.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: June 5, 2012
    Inventors: Yee Loong Chin, Weng Fei Wong, Wee Jin Yeap, Cheng Kwong Cheang
  • Publication number: 20120013486
    Abstract: The present invention relates an optical three-dimensional coordinate sensor system and method thereof. A plurality of light-emitting modules produce a plurality of light signals, and then a plurality of reflected light signals reflected by an object are received by a plurality of photodetectors. After receiving the reflected light signals, the photodetectors generate a plurality of photocurrents. A plurality of active pixel circuits receive the photocurrents and transform the photocurrents to a plurality of reflective optical voltages. A plurality of differential amplifier circuits (DAC) compare the reflective optical voltages and the background voltages, and then output a plurality of DAC output voltages of the reflected light signals. Afterward, a processing module detects the DAC output voltages and uses an algorithm to calculate the top three of the DAC output voltages to determine the three-dimensional coordinate of the object.
    Type: Application
    Filed: July 19, 2010
    Publication date: January 19, 2012
    Applicant: NATIONAL CHIAO TUNG UNIVERSITY
    Inventors: Paul C.P. Chao, Tzu-Yang Lin, Wei-Dar Chen
  • Patent number: 8093546
    Abstract: An angle sensor for detecting an out-of-round condition includes a disc supporting angle coder rigidly attached to a rotating shaft and at least one fixed optical system including a coherent light source emitting a beam interfering with the angle coder of the support disc in order to code its angular position, a collimator of the said beam before interference and a photo detector of the modulated beam after interference. In one embodiment, two optical systems arranged 90° from each other are employed. An alternative embodiment includes one optical system and the disc includes a circular track radially centred in at least one of its angular positions relative to the incident collimated light beam, and a radially orientated photo detector.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: January 10, 2012
    Assignees: Delphi Technologies, Inc.
    Inventors: Laurent Tupinier, Olivier R. Marroux, Johann Michel, Paul-Antoine Tritschler, Nandiaye Ndao, Bernard Kress
  • Publication number: 20110304482
    Abstract: An encoder configuration comprises a dual-modulation scale track pattern that provides a first intensity modulation component for producing periodic signals, and a second intensity modulation component for producing a long-range absolute signal. The dual-modulation scale track pattern increases the range-to-resolution ratio of the encoder without the use of additional scale tracks that would increase the width of the encoder components. The long-range signal may be encoded in the dual-modulation scale track pattern either by varying certain dimensions of pattern elements included in the scale track or by superimposing a layer including an optical density variation along on the track on pattern elements of similar areas. In either case, the net offset and/or amplitude levels of the associated signals are modified along the scale track. These modified offset and/or amplitude levels provide the basis for the long-range absolute signal.
    Type: Application
    Filed: June 10, 2010
    Publication date: December 15, 2011
    Applicant: MITUTOYO CORPORATION
    Inventors: Daniel John Kapner, Michelle Mary Milvich
  • Patent number: 8068040
    Abstract: A sensor head for sensing light modulated by a moveable member, such as a code wheel or code strip, in an optical encoder. The sensor head has at least one monitor optical sensor and a primary optical sensor positioned to receive light modulated by a modulation track on the moveable member. The monitor optical sensor provides a monitor signal that is compared in a signal comparator to the output from the primary optical sensor to detect light at the primary sensor.
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: November 29, 2011
    Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.
    Inventors: Weng Fei Wong, Chee Foo Lum, Siow Ming Tan
  • Patent number: 8044340
    Abstract: An encoder is provided in which the absolute angle can be detected with high accuracy even when the irradiated position of light to be detected with respect to a scale is displaced from a reference, and a photodetecting device for an encoder used for such an encoder. In the encoder 1, by passing light to be detected through a straight-line light transmitting portion 17, a bright portion 19 to which the light to be detected is irradiated is formed in an area of a scale plate 11 containing mutually separate parts of arranged lines L1 and L2 and also a dark portion 20 to which no light to be detected is irradiated is formed in the other area.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: October 25, 2011
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Seiichiro Mizuno, Yoshitaka Terada, Hitoshi Inoue, Takayuki Suzuki
  • Patent number: 8044339
    Abstract: An optical encoder and method for measuring displacement information using an optical encoder uses an encoder member with multiple digital diffractive optic regions to optically diffract an incident beam of light to produce output beams of light having intensity distribution patterns, which are used to generate electrical signals that provide relative displacement information of the encoder member.
    Type: Grant
    Filed: January 2, 2009
    Date of Patent: October 25, 2011
    Assignee: Arcus Technology, Inc.
    Inventors: Christopher C. Chang, Bernard C. Kress
  • Patent number: 8039786
    Abstract: In an absolute position detection type photoelectric encoder devised so as to detect a pseudorandom pattern disposed on a main scale by means of a plurality of imaging optical systems, assembling of the absolute position detection type photoelectric encoder is facilitated and production cost thereof is reduced by providing: a single light-receiving array element disposed on the imaging surfaces of the imaging optical systems, which incorporates a greater light-receiving array portion in the length measurement direction than the light-receiving range of the respective imaging optical systems; a window signal storing portion for storing a window signal showing a light-receiving range of the respective imaging optical systems; and a window signal comparison portion for obtaining signals corresponding to individual imaging ranges by comparing scanning signals of the light-receiving array element with window signals.
    Type: Grant
    Filed: April 27, 2009
    Date of Patent: October 18, 2011
    Assignee: Mitutoyo Corporation
    Inventors: Kouhei Kusano, Kouji Morimoto
  • Patent number: 8020310
    Abstract: A measuring element with a circular or linear track that encompasses a material measure and a number of sensors for scanning the track is disclosed. At least two scanning heads having the sensors are provided for scanning the track. The track of the measuring element has at least one first and a second partial track which are each provided with a first and a second grating period. For each grating period, one of the scanning heads is equipped with a sensor array that is adjusted to the grating period.
    Type: Grant
    Filed: September 6, 2007
    Date of Patent: September 20, 2011
    Assignee: Siemens Aktiengesellshaft
    Inventor: Roland Finkler