Using Phase Difference Of Output Signals From Plural Photodetectors Patents (Class 250/231.16)
  • Patent number: 10514296
    Abstract: A spectrometer includes a substrate; a slit which is provided on the substrate and through which light is incident onto the substrate; a metasurface including nanostructures that is configured to reflect and focus the light incident thereon through the slit, at different angles based on respective wavelengths; and a sensor which is provided on one side of the substrate that is opposite to another side of the substrate at which the metasurface is disposed, and configured to receive the light from the metasurface.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: December 24, 2019
    Assignees: SAMSUNG ELECTRONICS CO., LTD., CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Seunghoon Han, Amir Arbabi, Andrei Faraon, Ehsan Arbabi
  • Patent number: 10437141
    Abstract: A laser projection device has at least one laser light source and a plurality of gratings, each grating having a light receiving side and a light emitting side. The plurality of gratings are arranged in a ring-shape having at least one row with the light receiving side of each grating facing a center of the ring. The laser projection device also has a motor configured to rotate the plurality of gratings about a rotational axis passing through the center of the ring. The plurality of gratings each comprise a pattern for forming an image when light is passed through the pattern. The plurality of gratings are arranged around the ring such that the plurality of patterns are configured to project an animated image when the plurality of gratings sequentially receive light from the at least one laser light source upon rotation of the grating set.
    Type: Grant
    Filed: July 19, 2018
    Date of Patent: October 8, 2019
    Assignee: Everstar Merchandise Co Ltd
    Inventors: Chen Der Li, Chen Chih Lung, Chen Chih Ming
  • Patent number: 10401809
    Abstract: An apparatus and a method for controlling a rotating body in an electronic device are provided. The method includes emitting light to at least one indicator among a plurality of indicators having different reflectivities in a rotating body, receiving light reflected from the at least one indicator, detecting a rotation parameter of the rotating body based on an amount of the reflected light received from the at least one indicator, and controlling the rotating body based on the rotation parameter.
    Type: Grant
    Filed: February 3, 2016
    Date of Patent: September 3, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Younhyoung Kim, Junhui Lee
  • Patent number: 10386208
    Abstract: The instant disclosure provides an optical scanning light-guiding encoder including a light-guiding grating wheel, a light-emitting module and an optical sensing module. The optical sensing module includes a plurality of sensor elements adjacent to the light-guiding grating wheel, and a plurality of exposed sensor areas of the plurality of sensor elements are offset in the transverse direction and are arranged along a plurality of different horizontal lines parallel to each other. The optical scanning light-guiding encoder provided by the instant disclosure utilizes the coordination of the light projected on the optical sensing module and the plurality of exposed sensor areas to increase the resolution thereof without increasing the size of the encoder and the number of blades thereof.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: August 20, 2019
    Inventor: Hsin-Te Tseng
  • Patent number: 10378932
    Abstract: A sensor including a generating unit; a detecting unit; a substrate; a member that exerts influence on an object to be detected; and a housing that includes a first housing that operably supports the member and a second housing to which a part of the substrate is fixed. The substrate includes a first portion provided with the generating unit and a second portion provided with the detecting unit that are integrated, and has a curved shape or a bent shape in which a surface of the first portion at which the generating unit is provided and a surface of the second portion at which the detecting unit is provided face each other. One of the first portion and the second portion is fixed to the second housing. A surface of the other of the first portion and the second portion adheres to the first housing.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: August 13, 2019
    Assignee: NSK LTD.
    Inventors: Yasuhiro Kawai, Toshiaki Oguchi, Hideki Furukawa, Tomoyuki Yanagisawa, Minoru Kubokawa
  • Patent number: 10345120
    Abstract: The instant disclosure provides a scanning light-guiding encoder by forward focusing including a light-guiding grating wheel, a light-emitting module and an optical sensing module. The light-emitting module is surrounded by the light-guiding grating wheel. The optical sensing module includes a plurality of sensor elements adjacent to the light-guiding grating wheel, and a plurality of exposed sensor areas of the plurality of sensor elements are offset in the transverse direction and are arranged along a plurality of different horizontal lines parallel to each other.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: July 9, 2019
    Inventor: Hsin-Te Tseng
  • Patent number: 10337892
    Abstract: A sensor including: a generating unit; a detecting unit that detects the object to be detected generated by the generating unit; and a substrate at which the generating unit and the detecting unit are provided. The substrate is a flexible substrate that includes a first portion provided with the generating unit and a second portion provided with the detecting unit, the first portion and the second portion being integrated, and that takes a curved shape or a bent shape in which a surface of the first portion at which the generating unit is provided and a surface of the second portion at which the detecting unit is provided face each other. A plate support member is attached to a back-side surface of at least one of the surface of the first portion and the surface of the second portion.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: July 2, 2019
    Assignee: NSK LTD.
    Inventors: Yasuhiro Kawai, Toshiaki Oguchi, Hideki Furukawa, Tomoyuki Yanagisawa, Minoru Kubokawa
  • Patent number: 10302464
    Abstract: The optical encoder according to the present disclosure includes a light receiving part formed with a plurality of first patterns, and a scale formed with second patterns and moving relative to the light receiving part, where at least one of the first and second patterns is aligned at a same interval to remove harmonic waves.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: May 28, 2019
    Assignee: RS AUTOMATION CO., LTD.
    Inventor: Sang Hoon Lee
  • Patent number: 10254137
    Abstract: A photoelectric encoder includes light receiving units configured to output a plurality of photocurrent signals obtained by receiving light emitted from a light emission unit, via a scale, a signal conversion unit configured to output a conversion signal by converting the plurality of photocurrent signals, a position calculation unit configured to calculate an absolute position based on the conversion signal, and a microcomputer configured to perform drive control of the light emission unit, the signal conversion unit, and the position calculation unit. The microcomputer intermittently drives at least either one of the light emission unit and the signal conversion unit, and causes the position calculation unit to execute calculation according to a timing of intermit driving.
    Type: Grant
    Filed: December 8, 2016
    Date of Patent: April 9, 2019
    Assignee: MITUTOYO CORPORATION
    Inventor: Hirokazu Kobayashi
  • Patent number: 10190891
    Abstract: Embodiments of the present disclosure provide an optical encoder for an electronic device. The optical encoder comprises an elongated shaft having an encoding pattern made up of axial markings and radial markings. The encoding pattern may be disposed around a circumference of the elongated shaft. The optical encoder also includes an optical sensor. In embodiments, the optical sensor includes an emitter and a photodiode array. The emitter causes light to shine on the encoding pattern. The encoding pattern reflects the light back to the photodiode array and the photodiode array determines movement of the shaft based on the reflected light.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: January 29, 2019
    Assignee: Apple Inc.
    Inventors: Fletcher R. Rothkopf, Prashanth S. Holenarsipur, Colin M. Ely
  • Patent number: 10088777
    Abstract: A rotation detection device includes a light emitting portion, a light-passing control member, and a light receiving portion. The light-passing control member controls passing of the light from the light emitting portion. The light receiving portion outputs a light receiving signal based on the light received by the respective light receiving elements as detection signals representing detection results of the rotation by the rotator. A first virtual extended line that extends the first opening margin and a light-receiving-portion center line along the first direction passing through the respective light receiving elements at the light receiving portion pass through positions shifted from a rotational center of the light-passing control member. The light receiving portion is arranged such that the first virtual extended line corresponds to the light-receiving-portion center line, when the first opening margin passes through an optical path from the light emitting portion to the light receiving portion.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: October 2, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Yuta Nohara
  • Patent number: 10035535
    Abstract: There are provided a relative angle detection device suitable for expanding a torque detection range, and a torque sensor, an electric power steering device and a vehicle including the relative angle detection device. Based on a first sine signal representing sin(?os+??) and a first cosine signal representing cos(?os+??) in accordance with a rotation angle(?is) of a first multipolar ring magnet that synchronously rotates with an input shaft from between the coaxially arranged input shaft and an output shaft, and based on a second sine signal representing sin ?os and a second cosine signal representing cos ?os in accordance with a rotation angle(?os) of a second multipolar ring magnet that synchronously rotates with the output shaft, sin ?? and cos ?? are calculated in accordance with a relative angle(??) between the input shaft and the output shaft, and from ??=arctan(sin ??/cos ??), the relative angle(??) is calculated.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: July 31, 2018
    Assignee: NSK Ltd.
    Inventors: Kazuhiro Ohira, Masaki Kuwahara, Sumio Sugita, Shigeyuki Uematsu
  • Patent number: 9958988
    Abstract: In a method for optically capturing a fingerprint or an object on a surface (2) of a cover plate (1) of a screen with a plurality of photosensors (4) which are each assigned to a respective display pixel (6), the display pixels (6) emit light radiation and the photosensors (4) capture light radiation from the display pixels (6) reflected by the surface (2) within a scan angle (8). The scan angle (8) describes in a virtual mirror image plane (9) the size of the display pixel (6).
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: May 1, 2018
    Inventor: Dan Hossu
  • Patent number: 9927264
    Abstract: An encoder includes a disc having one or more slit arrays having multiple slits aligned in a circumferential direction of the disc, and an optical module positioned to face a portion of the slit array such that the slit array moves relative to the optical module in the circumferential direction of the disc. The optical module includes two or four light sources aligned along a direction corresponding to the circumferential direction and one or more light receiving arrays aligned along the direction corresponding to the circumferential direction, the light sources are positioned to irradiate light upon a portion of the slit array, and the light receiving array includes multiple light receiving elements positioned to receive the light irradiated by the light sources and light affected by actions of the slits.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: March 27, 2018
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventor: Takehiko Hamada
  • Patent number: 9903742
    Abstract: A displacement detecting device includes a main scale and a detecting head unit. The detecting head unit includes a light source, a light receiving unit, and an index scale group that is disposed in the middle of a light path from the main scale to the light receiving unit. The index scale group includes two or more index scales including diffraction gratings, respectively. A positive s-th order diffracted light and a negative s-th order diffracted light of diffracted lights from the main scale are used as the signal lights. The displacement detecting device satisfies a first condition and a second condition, the first condition being expressed as follows: ?×(u1?u2)×(mN÷g)=2×sin ?, the second condition being expressed as follows: ?×u1×(mN÷g)?sin ???÷g×?i=1N (ti×mi).
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: February 27, 2018
    Assignee: MITUTOYO CORPORATION
    Inventor: Akihide Kimura
  • Patent number: 9897463
    Abstract: The invention proposes a method for operating a sensor system comprising at least one sensor unit which provides signals, in which the signals comprise primary measurement value signals which are measurement values of the sensor unit or are generated from measurement values of the sensor unit and in which the signals comprise coefficient signals which characterize the measurement value capture.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: February 20, 2018
    Assignee: BALLUFF GmbH
    Inventors: Thomas Burkhardt, Ralph Bauer
  • Patent number: 9891079
    Abstract: A double-bearing position encoder has an axle stabilized within a housing via two bearings disposed on opposite walls of the housing. The axle is in communications with a rotating cam. The cam actuates a pulser so as to generate an active pulse at a tissue site for analysis by an optical sensor. The axle rotates a slotted encoder wheel or a reflective encoder cylinder disposed within the housing so as to accurately determine the axle position and, hence, the active pulse frequency and phase.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: February 13, 2018
    Assignee: Masimo Corporation
    Inventor: Cristiano Dalvi
  • Patent number: 9857205
    Abstract: An encoder system includes a disc coupled to a hub, the disc including a sensible member. The encoder system also includes a sensor operable to cooperate with the sensible member to sense an operating parameter of the disc, and a base assembly movable relative to the hub. A portion of the sensor is coupled for co-movement with the base assembly and movable between a first position in which the portion of the sensor is a first axial distance from the disc and a second position in which the portion of the sensor is a second axial distance from the disc, the second axial distance falling within a desired operating range.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: January 2, 2018
    Assignee: Quantum Devices, Inc.
    Inventor: Todd S. Martin
  • Patent number: 9797748
    Abstract: An inductive gear sensing system suitable for sensing gear (gear tooth) movement, such as some combination of speed, direction and position, based on differential sensor response waveforms. Example embodiments of inductive gear sensing with differential sensor response for different gear configurations include generating differential pulsed/phased sensor response signals from dual differential sensors based on axial (proximity-type) sensing for offset differential sensors (FIG. 1B, 102, 102; FIG. 2B, 201, 202), and generating asymmetrical response signals from a single sensor based on lateral and axial sensing with either asymmetrical gear teeth (FIG. 3A, 30A; FIG. 3B, 30B) or an asymmetrical sensor (FIG. 4B, 401) or a combination of both.
    Type: Grant
    Filed: December 19, 2014
    Date of Patent: October 24, 2017
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: George P. Reitsma
  • Patent number: 9758327
    Abstract: A rotation detecting unit includes a light emitting device, a light receiving device, an output device, a rotatable plate, and a discriminating device. The rotatable plate includes a first portion and a second portion which are alternately provided along a circumferential direction, a third portion provided between the first portion and the second portion, and a fourth portion provided between the second portion and the first portion. When a region of the first portion is irradiated with light emitted from the light emitting device and received by the light receiving device, received light quantity of the light receiving device is a maximum. When a region of the second portion is irradiated with the light, the received light quantity is a minimum. When the third or fourth portion is irradiated with the light, the received light quantity is larger than the minimum and is smaller than the maximum.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: September 12, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masato Suzuki
  • Patent number: 9758191
    Abstract: A zero point calibration apparatus for a steering angle sensor using a rotational displacement difference includes: a steering angle sensor configured to sense a steering angle of a column in a steering apparatus for a vehicle; a motor angle sensor configured to sense a rotation angle of a motor which supports steering by the column in the steering apparatus; and a control unit configured to calculate a current rotational displacement difference pattern between the steering angle and the motor angle, and derive the middle point of the current rotational displacement difference pattern. When the middle point does not coincide with a zero point set in the steering angle sensor, the control unit determines that the zero point set in the steering angle sensor is abnormal, and calibrate the zero point.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: September 12, 2017
    Assignee: HYUNDAI MOBIS CO., LTD.
    Inventor: Dong Hee Kim
  • Patent number: 9700159
    Abstract: A non-linear checkout stand which offers retailers additional options for configuring a store. An example checkout stand includes a housing including a first end and a second end, a conveyor for transporting items in a plurality of different directions along a non-linear path connecting the first end to the second end, and an item identifier within the housing on the non-linear path for automatically identifying the items.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: July 11, 2017
    Assignee: NCR CORPORATION
    Inventors: Ferdinand Calderon, Jason Delos Angeles
  • Patent number: 9683871
    Abstract: Provided is an optical encoder, including: a light receiving unit; and a scale moving relatively to the light receiving unit and including a first track and a second track each having patterns intended for projecting light onto the light receiving unit, wherein the number of patterns of the first track is Ns*Nd+i (where, Ns and i are an integer of 1 or greater, and Nd is an integer of 2 or greater), and the number of patterns of the second track is (Ns?1)*Nd+i, so an absolute angle of the scale can be calculated in real time and in high resolution.
    Type: Grant
    Filed: May 29, 2014
    Date of Patent: June 20, 2017
    Assignee: RS AUTOMATION CO., LTD.
    Inventor: Sang Hoon Lee
  • Patent number: 9677938
    Abstract: A spectral characteristic acquisition device includes a member configured to have a plurality of openings arrayed in a predetermined direction, each of the plurality of openings inclined with respect to the predetermined direction, the plurality of openings being configured to pass light beams from a plurality of positions on an object therethrough, a spectrally dispersing part configured to spectrally disperse the light beams having passed through the plurality of openings in a direction orthogonal to the predetermined direction, and a plurality of one-dimensional image capturing parts provided at a predetermined interval in a plurality of lines and configured to be irradiated with the light beams having been spectrally dispersed by the spectrally dispersing part, a plurality of pixels of the plurality of one-dimensional image capturing parts being arrayed in a direction parallel to the predetermined direction.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: June 13, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kohei Shimbo, Naohiro Kamijo, Yoichi Kubota
  • Patent number: 9625332
    Abstract: In order to implement a structure capable of improving the resolution of torque measurement while preventing the plastic deformation of a torsion bar (15), an input-side stopper (61) having an uneven shape (gear shape) in the circumferential direction is provided in a portion of an input-side rotating body (55) that includes an input shaft (13) and an input gear (7), and an output-side stopper (63) having an uneven shape (gear shape) in the circumferential direction is provided in a portion of an output-side rotating body (56) that includes an output shaft (14) and an output gear (8). The input-side stopper (61) and the output-side stopper (63) are combined so as to be engaged to be able to transmit torque only when the torsional angle within the elastic range of the torsion bar (15) reaches a predetermined amount.
    Type: Grant
    Filed: September 3, 2014
    Date of Patent: April 18, 2017
    Assignee: NSK Ltd.
    Inventors: Tomoharu Saito, Yasuyuki Matsuda, Daisuke Gunji, Masafumi Hikida, Kazutaka Tanaka, Tohru Ueda, Yuka Kaneko, Tetsu Takehara, Hiroyasu Yoshioka
  • Patent number: 9627573
    Abstract: An optical sensor is described that includes a light emitter and a photodetector assembly directly attached to a transparent substrate. In one or more implementations, the optical sensor comprises at least one light emitter and a photodetector assembly (e.g., photodiodes, phototransistors, etc.). The light emitter(s) and the photodetector assembly are directly mounted (e.g., attached) to a transparent substrate.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: April 18, 2017
    Assignee: Maxim Integreated Products, Inc.
    Inventors: Jerome C. Bhat, Dan G. Allen, Richard I. Olsen, Kumar Nagarajan
  • Patent number: 9621810
    Abstract: A method of operating an electronic device is provided. The method includes acquiring an image including one or more objects, detecting distances between the one or more objects and the electronic device, determining a display methods to display information related to the one or more objects based on the distances, and displaying the information related to the one or more objects based on the determined display method.
    Type: Grant
    Filed: February 25, 2015
    Date of Patent: April 11, 2017
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hong-Suk Choi, Moon-Soo Kim
  • Patent number: 9518846
    Abstract: A reflective optical encoder, which is inexpensive and is compact in the axial direction thereof. An encoder has a generally circular code plate fixed to a rotating body such as a rotation shaft of a motor; and a light emitting unit and a light receiving unit which are positioned near a first major surface of the code plate. The code plate is made from a light transmissive resin, and on the first major surface, an incidence portion with a concavo-convex shape and an emission portion with a concavo-convex shape are formed. On a second major surface opposed to the first major surface, a transmission portion formed from a concavo-convex shape and configured to transmit light, and a total reflection portion formed from a flat surface and configured to totally reflect light, are formed, wherein the transmission portion and the total reflection portion constitute a code pattern section.
    Type: Grant
    Filed: January 6, 2015
    Date of Patent: December 13, 2016
    Assignee: Fanuc Corporation
    Inventors: Akinobu Sakata, Nobuyuki Ootake
  • Patent number: 9462205
    Abstract: An image processing device includes a gain correction processing unit, an interpolation correction processing unit, an image processing unit. Within a range including a correction target phase difference detecting pixel and a plurality of capturing pixels adjacent to the correction target phase difference detecting pixel and detecting the same color as a color of the correction target phase difference detecting pixel, when a signal value obtained by correcting an output signal of the correction target phase difference detecting pixel using gain correction processing is Sc, in a case in which Sc<TH1 or Sc>TH2, the image processing unit records, in a recording medium, a signal obtained by correcting the output signal of the correction target phase difference detecting pixel by the interpolation correction processing unit.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: October 4, 2016
    Assignee: FUJIFILM Corporation
    Inventor: Kazufumi Sugawara
  • Patent number: 9417101
    Abstract: An optical encoder includes a light source, a scale which is irradiated by the light source and has a fine pitch pattern and a coarse pitch pattern in a measuring direction in one track, a high resolution detection sensor array which receives light from the scale and detects the fine pitch pattern, and a low resolution detection sensor array which receives light from the scale and detects the coarse pitch pattern. A transmittance distribution or a reflectivity distribution of the scale is a distribution obtained by summing up a modulation component which corresponds to the fine pitch pattern and in which integrated values in a direction perpendicular to the measuring direction form modulation amplitude uniform in the measuring direction and a modulation component which corresponds to the coarse pitch pattern and in which modulation amplitude is uniform in the measuring direction.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: August 16, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventor: Chihiro Nagura
  • Patent number: 9304016
    Abstract: An encoder device for optical detection of movement or position includes a first terminal for delivery of an electric measurement code signal. The encoder device further includes a first printed circuit board, a detector mounted on the first printed circuit board, and a code device provided with a pattern. The detector and the code device are displaceable relative to each other, wherein the detector is adapted to generate the electric measurement code signal in dependence on the relative displacement. The detector includes at least one light-sensitive semiconductor chip having a first light-sensitive chip surface and a second chip surface on opposing sides. The first light-sensitive chip surface has a first chip contact area for an electrical connection.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: April 5, 2016
    Assignee: LEINE & LINDE AB
    Inventor: Per Andreason
  • Patent number: 9281978
    Abstract: A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: March 8, 2016
    Assignee: Smart Embedded Systems, Inc.
    Inventor: Pranatharthi Subbaratnam Haran
  • Patent number: 9234745
    Abstract: A method and system to measure misalignment error between two overlying or interlaced periodic structures are proposed. The overlying or interlaced periodic structures are illuminated by incident radiation, and the diffracted radiation of the incident radiation by the overlying or interlaced periodic structures are detected to provide an output signal. The misalignment between the overlying or interlaced periodic structures may then be determined from the output signal.
    Type: Grant
    Filed: July 1, 2015
    Date of Patent: January 12, 2016
    Assignee: KLA-Tencor Corporation
    Inventors: Ibrahim Abdulhalim, Mike Adel, Michael Friedmann, Michael Faeyrman
  • Patent number: 9184965
    Abstract: A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: November 10, 2015
    Assignee: Smart Embedded Systems, Inc.
    Inventor: Pranatharthi Subbaratnam Haran
  • Patent number: 9163959
    Abstract: A position detecting device using a reflection type photosensor, comprising a reflector fitted to a moving target and having reflecting portions and non-reflecting portions arranged alternately in a moving direction of the moving target, a reflection type photosensor having a light emitting element and a light receiving element with plural light receiving portions, and an operation unit for calculating a value indicating the position of the moving target. The light receiving element comprises the first and second light receiving portions outputting signals having different phases, the second light receiving portion is divided into two regions provided at far and near sides from the light emitting element about the first light receiving portion, and the operation unit calculates the value using the one signal calculated from the output signals from the two regions and the output signal from the first light receiving portion.
    Type: Grant
    Filed: February 6, 2014
    Date of Patent: October 20, 2015
    Assignee: NEW JAPAN RADIO CO., LTD.
    Inventor: Kazuhito Fukui
  • Patent number: 9157769
    Abstract: A reference point detection light-receiving unit receives light from a reference point detection pattern by first to fifth light-receiving elements. The first to fifth light-receiving elements are arranged in a first direction and outputs first to fifth signals, respectively. A reference signal generation circuit outputs a reference signal that starts at a period where a level of a signal, which is obtained by adding first and second signals, and a level of a signal, which is obtained by adding third and fourth signals, will become equal, and ends at a period where a level of a signal, which is obtained by adding the second and third signals, and a level of a signal, which is obtained by adding fourth and fifth signals, become equal.
    Type: Grant
    Filed: May 6, 2014
    Date of Patent: October 13, 2015
    Assignee: MITUTOYO CORPORATION
    Inventor: Akihide Kimura
  • Patent number: 9121733
    Abstract: A position detector, includes: a scale having first and second patterns having respective first and second period; a detector array including elements each detecting energy intensities based on the patterns; a generator configured to generate first and second signals having phases different from each other obtained based on the patterns respectively; and a deriver deriving a position of the array relative to the scale based on the signals, wherein the scale is movable relative to the array; the deriver derives a reference position as a detection element array position relative to the scale based on the signals, performs a first process to derive a array position relative to the scale by a array displacement relative to the reference position is derived based on the first signals, and performs a second process in which a relative array position is derived based on the position derived by the first process.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: September 1, 2015
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Takurou Asano
  • Patent number: 9106488
    Abstract: A method and a highway addressable remote transducer (HART) soft modem device for modulating and demodulating analog signals with HART messages are provided. A phase coherent frequency shift keying (FSK) modulator modulates and transmits analog signals with HART messages, and a phase coherent FSK demodulator receives and demodulates the analog signals with the HART messages. The FSK modulator is a digital modulator that outputs 1 or 0 for transmission. With oversampling and low pass filtering, the digital modulation results in low jitter and good signal to noise ratio. The FSK demodulator applies a fast energy detect algorithm and dynamically reduces or increases a clock speed of a central processing unit (CPU) of the HART soft modem device for reducing power consumption of the CPU. Furthermore, the HART soft modem device uses direct memory access (DMA) to further reduce the power consumption, thereby reducing the overall power consumption by around 50%.
    Type: Grant
    Filed: August 23, 2014
    Date of Patent: August 11, 2015
    Assignee: Smart Embedded Systems, Inc.
    Inventor: Pranatharthi Subbaratnam Haran
  • Patent number: 9024567
    Abstract: The driving apparatus includes: driving unit driving driven unit; controller controlling the driving unit; portion to be detected in which first areas and second areas are arranged alternately; and detector that detects the first and second areas. The portion includes, on one side of base position in a moving direction, first areas having small width and second areas having different widths larger than the first areas on the one side, and includes, on the other side, second areas having small width and first areas having different widths larger than the second areas on the other side. When moving the driven unit to specific position, the driven unit is driven in direction determined according to an area detected by the detector when starting the operation, and reverses the direction if the driven unit is moved by a predetermined amount or larger in the area after the detection area is changed.
    Type: Grant
    Filed: June 6, 2012
    Date of Patent: May 5, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kenji Kagei
  • Patent number: 9018578
    Abstract: A flexible optical displacement encoder configuration uses a source grating to illuminate a scale with structured light such that light from the scale is modulated with a beat frequency envelope which may have a relatively coarse pitch that matches a desired detector pitch. An imaging configuration provides spatial filtering to remove the high spatial frequencies from the modulation envelope to provide a clean signal in the detected fringe pattern. This combination of elements allows an incremental scale track pattern with a relatively finer pitch (e.g., 4, 5, 8 microns) to provide fringes with a coarser pitch (e.g., 20 microns) at a detector. Various scale resolutions can use a corresponding source grating such that all combinations can produce detector fringes that match the same economical detector component.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: April 28, 2015
    Assignee: Mitutoyo Corporation
    Inventors: Joseph Daniel Tobiason, Eric Herbert Altendorf
  • Patent number: 8970835
    Abstract: An optical characteristic measuring apparatus includes a hemispheric portion having a reflective surface on its inner wall, and a plane portion arranged to close an opening of the hemispheric portion and having a reflective surface on an inner-wall side of the hemispheric portion. The plane portion includes a first window occupying a range including a substantial center of curvature of the hemispheric portion for attaching a light source to the first window. At least one of the hemispheric portion and the plane portion includes a plurality of second windows arranged in accordance with a predetermined rule for extracting light from inside the hemispheric portion.
    Type: Grant
    Filed: November 6, 2012
    Date of Patent: March 3, 2015
    Assignee: Otsuka Electronics Co., Ltd.
    Inventors: Kazuaki Ohkubo, Hisashi Shiraiwa
  • 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: 8941051
    Abstract: An object of the present invention is to provide a position detecting device using a reflection type photosensor, which assures a small size and low cost and enables detection of a long distance of about 10 mm or more, and a position detecting method. The position of a moving body is detected by providing, on the moving body, a reflection plate (12) having reflecting surfaces (sa) and non-reflecting surfaces (sb) arranged alternately in a moving direction of the moving body, providing a light receiving element (8) of the reflection type photosensor (9) with, for example, two light receiving portions (8a and 8b) having different light receiving regions in the moving direction of the moving body, outputting output signals from these two light receiving portions (8a and 8b), and carrying out at least one calculation of adding, subtracting, dividing and function calculation of these two output signals.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: January 27, 2015
    Assignee: New Japan Radio Co., Ltd.
    Inventors: Fumiaki Ohno, Kazuhito Fukui
  • Patent number: 8895911
    Abstract: An optical encoder includes a scale having diffraction gratings formed at predetermined pitches in a measurement axis direction, a detection head relatively movable with respect to the scale, the detection head including a light source portion configured to irradiate the scale with light, and a plurality of receiver portions configured to receive light reflected by or transmitted through the diffraction gratings of the scale, at different phases, and a signal processing device configured to perform signal processing to light reception signals output from the receiver portions of the detection head, to produce quadrature differential signals. The signal processing device is configured to calculate alignment adjustment monitor signals corresponding to a Lissajous radius of the quadrature differential signals in order to detect misalignment of the detection head with respect to the scale.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: November 25, 2014
    Assignee: Mitutoyo Corporation
    Inventor: Tomotaka Takahashi
  • Patent number: 8890057
    Abstract: An optical position-measuring device includes a measuring standard and a scanning unit. The measuring standard includes an incremental graduation and at least one reference marking at a reference position. The reference marking has two reference-marking subfields disposed in mirror symmetry relative to a reference-marking axis of symmetry, each of the subfields including a grating structure having a locally changeable graduation period. The scanning unit includes a divergently emitting light source, one or more gratings, and a reference-signal detector system. The reference-signal detector system has at least four detector arrays formed and positioned such that, from the scanning of the reference marking via the reference-signal detector system, first and second pairs of partial reference signals result, in each case having a signal pattern in phase opposition. The first pair of partial reference signals is offset by an offset amount relative to the second pair of partial reference signals.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: November 18, 2014
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Michael Hermann
  • Patent number: 8841600
    Abstract: Disclosed are various embodiments of circuitry and methods to compensate for variations in hysteresis associated with the comparators of an interpolation circuit in a single track optical encoder. Such variations in hysteresis may be minimized or eliminated by providing appropriately configured resistor ladder circuits to condition the inputs to the comparators, or by programming or trimming resistors in positive feedback loops of the comparators. 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: October 31, 2010
    Date of Patent: September 23, 2014
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Chung Min Thor, Gim Eng Chew, Weng Chong Sam
  • Patent number: 8804131
    Abstract: In an optical angle-measuring device for ascertaining the relative movement between at least one scanning grating and a graduated disk having at least one measuring graduation, the scanning grating is in the form of a linear scanning grating, and the graduated disk includes a first and a second combined radial-circular grating as measuring graduation, and has a mirror. An incident beam of rays is initially split at the scanning grating into two partial beams of rays that then propagate in the direction of the first combined radial-circular grating and are diffracted there, then propagate in the direction of the mirror and are reflected there in the direction of the second combined radial-circular grating, subsequently propagate in the direction of the second combined radial-circular grating and are diffracted there, and then propagate in the direction of the scanning grating, where a superposition of the partial beams of rays results.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: August 12, 2014
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Wolfgang Holzapfel
  • 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: 8742322
    Abstract: The laminated diffractive optical element includes plural diffraction gratings (21, 22 and 23) laminated with each other, the respective diffraction gratings being formed of a same light-transmissive material. In the element, reflective films are formed on grating surfaces (11 and 12) of the respective diffraction gratings, each of the reflective films being disposed between the diffraction gratings. Each of the reflective films reflects light in a specific wavelength range and transmits light in a wavelength range different from the specific wavelength range, the specific wavelength ranges of the respective reflective films being different from each other. The grating surfaces of the respective diffraction gratings are formed in shapes different from each other according to the specific wavelength ranges corresponding to the respective reflective films.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: June 3, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Ko Ishizuka