Incremental Patents (Class 341/11)
  • Patent number: 9944099
    Abstract: An output value of the transport position output portion when a first mark which is provided in a recording medium is at a predetermined position with respect to a detection region is stored in a storage portion as a reference value, and a start timing of the printing of the image is controlled based on the timing at which the mark detection portion detects the mark after confirming that the first mark reaches a predetermined range from the detection region based on comparison of the output value of the transport position output portion and the reference value with each other, when the transport in the first direction of the recording medium is started.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: April 17, 2018
    Assignee: Seiko Epson Corporation
    Inventors: Naoki Hori, Masashi Oba, Kunihiro Kawada, Shinji Kawakami
  • Patent number: 9598066
    Abstract: A control apparatus for a vehicle motor is a control apparatus for a vehicle motor configured to control a motor that can realize a plurality of characteristics in which output upper limits of torque are different from each other. The control apparatus for the vehicle motor is provided with: a characteristic switching device configured to switch a characteristic of the motor between a first characteristic in which the output upper limit is first predetermined torque and a second characteristic in which the output upper limit is second predetermined torque, which is lower than the first predetermined torque; a characteristic switching abnormality determining device configured to determine whether or not there is an abnormality in switching of the characteristic of the motor; and a fail-safe performing device configured to perform a fail-safe process according to the characteristic of the motor if it is determined that there is the abnormality in the switching of the characteristic of the motor.
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: March 21, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takashi Kawai, Takuro Kumada
  • Patent number: 9441990
    Abstract: Some embodiments may include a capacitive rotary position encoder for the absolute determination of a rotary position about a rotary spindle. The rotary position encoder may include a transceiver unit, comprising a first arrangement of N electrically conductive, capacitive sensitivity areas which are embodied as angle segments over a defined angle range, which are distributed uniformly over the circumference, an electrically conductive reference area and an evaluation circuit, by means of which an electrical capacitance value between the reference area and one of the sensitivity areas is determinable. In some embodiments the sensitivity areas and the reference area are embodied as conductor track structures on a first electronics printed circuit board.
    Type: Grant
    Filed: July 8, 2014
    Date of Patent: September 13, 2016
    Assignee: LEICA GEOSYSTEMS AG
    Inventors: Peter Forrer, Siegfried Wiltsche
  • Patent number: 9429959
    Abstract: A control apparatus for a linear motion stage includes: a first filter for filtering the frequency of a signal received from a linear encoder of the linear motion stage; an adder for adding an input signal representing a command position and a negative of an output signal of the first filter; a control for generating a control signal for controlling the linear motion stage based on an output signal of the adder; and a second filter for filtering the frequency of the control signal. Each of the input terminals of the first and second filters has a correction table for storing cut-off frequencies and damping rates measured according to the driven positions of the linear motion stage, thereby applying the correction table so as to determine the cut-off frequencies of the first and second filters and the damping rates according to the driven positions of the linear motion stage.
    Type: Grant
    Filed: March 5, 2014
    Date of Patent: August 30, 2016
    Assignee: Soonhan Engineering Corp.
    Inventor: Byoung Gwan Ko
  • Patent number: 9263978
    Abstract: A drive unit, which can be included in an image forming apparatus with peripherals disposed thereto and use a control method therefore, includes an inner rotor brushless DC motor, a driver, a rotation detector, and a controller. The driver supplies power to drive the brushless DC motor. The rotation detector detects an amount and direction of rotations of an output shaft. The controller controls the rotations of the brushless DC motor and obtains a target drive signal of the brushless DC motor externally and a detection signal from the rotation detector and outputs a signal to the driver. The controller controls a speed of rotation of the brushless DC motor by varying the signal output to the driver based on the target drive signal and the detection signal.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: February 16, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Murata, Shogo Sakamoto, Kenji Tomita
  • 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: 8912929
    Abstract: Detection precision is improved by reducing a detection error of a change in position of a target. A correction value derivation apparatus is provided for deriving a correction value used in correction of a displacement amount derived based on an encoder signal indicating a change in position of a movable portion as a target. A displacement amount derivation unit is configured to derive a detected displacement amount of the movable portion based on the encoder signal. A displacement velocity derivation unit is configured to derive a detected displacement velocity based on the detected displacement amount derived by the displacement amount derivation unit. An average displacement velocity calculation unit is configured to calculate an average displacement velocity over a predetermined displacement range. A correction value derivation unit is configured to derive the correction value based on the detected displacement velocity and the average displacement velocity.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: December 16, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masahiko Mizoguchi
  • Patent number: 8788099
    Abstract: A motion control interface device includes an FPGA configured to implement a step generation algorithm that generates step control signals for a motion device. The signals are not determined based directly on time, but instead are determined from the position of the motion device. More particularly, the step generation algorithm operates to keep track of a position fraction based on the position. The position fraction is incremented (or decremented) at each clock tick of the FPGA. The algorithm generates rising edge signals when the position fraction crosses a particular threshold value, referred to as the rising edge threshold value. Similarly, the algorithm signals direction changes when the position fraction crosses a threshold referred to as the direction change threshold value.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: July 22, 2014
    Assignee: National Instruments Corporation
    Inventor: Kiran Sreekantham
  • 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: 8742321
    Abstract: An origin location detection circuit in an encoder. The encoder includes a scale on which an origin pattern indicating an origin is provided and a detection head relatively displaceable with respect to the scale. The origin location detection circuit includes a comparator for generating an origin signal indicating a location of the origin from an output voltage signal, which is output from a detector of the detection head and has been affected by involvement of the origin pattern; a DC voltage detection circuit smoothing the output voltage signal; and a differential amplifier circuit performing differential amplification of the output voltage signal and a DC voltage signal output from the DC voltage detection circuit. A differential amplifier signal of the differential amplifier circuit is input to the comparator.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: June 3, 2014
    Assignee: Mitutoyo Corporation
    Inventors: Ryuichi Koiso, Toru Yaku
  • Patent number: 8681024
    Abstract: An encoder without a stopping structure comprises a rotating shaft (1), an axis sleeve (2), a stopping base (4), a positioning elastic trip (5), a spacer (6), a partition plate (7), at least one movable arm (8), at least one electric brush (9) and at least one main body (11), and they are sequentially arranged from bottom to top. There is not any stopping structure on the rotating shaft (1) and the stopping base (4). The rotating shaft (1) can be rotated 360 degrees or more. The electric brush (9) has a plastic covered part (91), a bent part (92), an elastic arm (93) and a brush head (94) forming an integrated structure. The plastic covered part (91) is covered in a movable arm (8). The bent part (92) connects the plastic covered part (91) and the elastic arm (93) and bends the elastic arm (93) toward the plastic covered part (91). The elastic arm (93) comprises a main arm (931) with long strip ring body and a branch arm (932).
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: March 25, 2014
    Inventor: Zhiliang Jin
  • Patent number: 8674288
    Abstract: A motor may be configured to drive a drive shaft and an engagement member supported on the drive shaft. A detectable feature comprising a rotary member may be supported on the drive shaft such that movement of the drive shaft by the motor changes a state of the detectable feature. At least one sensor may be arranged to detect the state of the detectable feature. Circuitry may be configured to provide a signal in response to a change in the state of the detectable feature detected by the at least one sensor.
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: March 18, 2014
    Assignee: Medtronic MiniMed, Inc.
    Inventors: Ian B. Hanson, Paul F. Bente, IV, Jacques L. Favreau, Lothar Westerweck
  • Publication number: 20140028478
    Abstract: This invention improves detection precision by reducing a detection error of a change in position of a target. A correction value derivation apparatus for deriving a correction value used in correction of a displacement amount derived based on an encoder signal indicating a change in position of a movable portion as a target, comprises: a displacement amount derivation unit configured to derive a detected displacement amount of the movable portion based on the encoder signal; a displacement velocity derivation unit configured to derive a detected displacement velocity based on the detected displacement amount derived by the displacement amount derivation unit; an average displacement velocity calculation unit configured to calculate an average displacement velocity over a predetermined displacement range; and a correction value derivation unit configured to derive the correction value based on the detected displacement velocity and the average displacement velocity.
    Type: Application
    Filed: June 24, 2013
    Publication date: January 30, 2014
    Inventor: Masahiko Mizoguchi
  • 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: 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
  • 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
  • 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: 8288709
    Abstract: An optical encoder device is provided, in which first light transmissive slits are formed in a movable slit plate and second light transmissive slits are formed in a stationary slit plate. The number of the second light transmissive slits is defined as S. The second light transmissive slits are formed in the stationary slit plate such that when one of the second light transmissive slits is optically coincident with one of the first light transmissive slits, the remaining S-1 second light transmissive slits are shifted in position from other first light transmissive slits corresponding to the remaining second light transmissive slits by S-1 phase differences.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: October 16, 2012
    Assignee: Sanyo Denki Co., Ltd.
    Inventor: Yoshihiro Shoji
  • 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: 8207870
    Abstract: An apparatus and method for recognizing a rotor position, and an electric power steering system using the same wherein resolution in rotor position recognition can be improved by software by adding one or more increment values, which is proportional to the rotation speed of a rotor, in an interval where the counted number of increment pulses of a pulse generator is not changed in sampling the counted number of increment pulses of the pulse generator so as to recognize a rotor position of a motor.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: June 26, 2012
    Assignee: Mando Corporation
    Inventor: Hyeok Kim
  • Publication number: 20120148324
    Abstract: In a method or device to sample a web movement, an incremental encoder translates the web movement into two phase-offset output signals. A quadrature decoder generates first and second digital output signals with two respective signal levels. The first output signal is designated as a forward signal and the second output signal is designated as a backward signal. An evaluation circuit outputs a control signal and has a first counter that counts a signal change of the forward signal and subtracts from the count a signal change of the backward signal. A second counter counts a signal change of the control signal. A comparator compares values of the first and the second counters. A disabling device enables the forward signal if values of both the first and second counters are the same so that the forward signal is output, and disables the forward signal if values of the two counters are different.
    Type: Application
    Filed: August 20, 2010
    Publication date: June 14, 2012
    Inventors: Peter Thiemann, Stephan Pilsl
  • Publication number: 20110316722
    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: Application
    Filed: December 20, 2010
    Publication date: December 29, 2011
    Applicant: THALES
    Inventors: GREGORY FAZILLEAU, DIDIER GUINIER
  • 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: 7994470
    Abstract: The present invention relates to a photoelectric encoder including a scale having a grating (incremental pattern) of a predetermined pitch formed thereon and a light source (light-emitting element) and a light-receiving unit, which are relatively displaceable with respect to the scale, wherein light-receiving elements of the light-receiving unit output bright and dark signals of “N” phases, and the phases are detected by fitting a sinusoidal wave function having a fixed period to the bright and dark signals of “N” phases, thereby reducing a position detection error resulting from stains on the scale and/or defects of the grating.
    Type: Grant
    Filed: August 10, 2009
    Date of Patent: August 9, 2011
    Assignee: Mitutoyo Corporation
    Inventor: Kouhei Kusano
  • Patent number: 7864075
    Abstract: A rotary electrostatic encoder comprising a disk-shaped fixed plate having a first transmission electrode, a second transmission electrode, and four reception electrodes; a disk-shaped rotating plate having a first induction electrode superposed on and facing the first transmission electrode, and a second induction electrode positioned on the inside of the first induction electrode and superposed on and facing the second transmission electrode, a portion of the second induction electrode being a protruding eccentric circular part; transmission means for applying a transmission signal between the first transmission electrode and the second transmission electrode; and signal processing means for generating an output signal relating to the absolute rotational displacement of the rotating plate on the basis of two signal components generated from the four reception electrodes.
    Type: Grant
    Filed: April 6, 2009
    Date of Patent: January 4, 2011
    Assignee: Seidensha Corporation
    Inventor: Masahiko Gondo
  • Patent number: 7830278
    Abstract: A sensor arrangement and a method for the precise detection of relative movements between an encoder and a sensor, including an encoder, which has an incremental scale having a plurality of scale subdivisions (?), and a sensor which is magnetically coupled to the encoder via an air gap and includes at least two magnetic field sensor elements (SE1, SE2) which are arranged offset with respect to one another by a defined distance (?x) in the direction of the relative movement, the magnetic field sensor element output signals (V1, V2) having been shifted relative to one another by a relative-speed-dependent time difference with regard to the detection of a scale subdivision (?) or a defined part of a scale subdivision (N,S), the sensor having a signal processing circuit which comprises an interface module which generates a sensor output signal (IS3,IS4) including at least one speed signal based upon the time difference.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: November 9, 2010
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Peter Lohberg, Klaus Rink
  • Patent number: 7804427
    Abstract: An encoder reset device and method that allows for an encoder to be automatically reset without operator intervention. A reset device of the present invention includes a microprocessor-based controller and associated programming for operating the reset device. As part of the automatic reset process, a reset device of the present invention is able to perform the connector pin jumpering necessary to resetting many encoders.
    Type: Grant
    Filed: March 20, 2009
    Date of Patent: September 28, 2010
    Assignee: Honda Motor Co., Ltd.
    Inventors: Eric Diamond, Jeff Davis, Hugo Beltran
  • Patent number: 7797127
    Abstract: A method for determining two pseudo-sinusoidal signals in quadrature from a pseudo-sinusoidal signal transmitted by an encoder is provided. The method using a sensor arranged within reading distance of the encoder, which sensor includes at least four sensing elements which are linearly equally distributed. The sensing elements are each capable of delivering a signal Si representative of the signal transmitted by the encoder. The method measuring the signals Si and combining the signals Si in order to form the signals U=(S1?S2)?(S3?S4) and V=(S2?S3), which signals U and V are in quadrature. A system for determining by implementing such a method, as well as a bearing including such a determination system, are provided.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: September 14, 2010
    Assignee: SNR Roulements
    Inventors: Pascal Desbiolles, Christophe Duret
  • Patent number: 7786631
    Abstract: A position-data converter and a motor-drive control device are connected. The position-data converter receives two-phase, sine-wave analog signals da and db from two first magnetic detectors, respectively, and converts these signals da and db to position data. On receiving a positioning instruction, the motor-drive control device calculates the value of current, from the current position signal generated by the position-data converter. The permanent magnets incorporated in a linear motor are used as components of a linear scale, as well.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: August 31, 2010
    Assignee: Wako Giken Co., Ltd
    Inventors: Toshihiko Sasaki, Kazuo Watanabe, Katsumi Ishikawa
  • Patent number: 7663093
    Abstract: A scale has a first incremental track with first incremental patterns including first light and dark patterns formed at equal intervals in first periods, an absolute track with absolute patterns representing absolute positions, and a second incremental track with second incremental patterns including second light and dark patterns formed at equal intervals in second periods longer than the first periods. A light source emits a measurement light to the scale. A photodetector receives the measurement light reflected at or transmitted through the scale. A signal processing circuit processes the received light signal of the photodetector to detect an absolute position of the scale.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: February 16, 2010
    Assignee: Mitutoyo Corporation
    Inventor: Kouhei Kusano
  • Patent number: 7646314
    Abstract: The invention relates to displacement encoder for a movable shaft, comprising a sleeve (2) which is intended to be fixed in rotation to the shaft (3) and an encoding element (4) which is made from magnetizable polymer and which is solidly connected to the sleeve, said encoding element being equipped with an encoding zone (6) having at least one polarized mark. The aforementioned encoding zone of the encoding element is covered with a protective layer (10) which is made from a polymer having a surface abrasion resistance greater than that of the magnetizable polymer. The invention also relates to a device comprising one such encoder and to a production method thereof.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: January 12, 2010
    Assignee: Hutchinson Worldwide
    Inventors: Bernard Branchereau, Patrick Fayaud
  • Patent number: 7619537
    Abstract: In an encoder which is equipped with two detectors arranged on both sides of a rotating shaft in order to eliminate an eccentricity error, the mounting of the detectors is facilitated by making provisions so as to not cause a problem in the calculating of an average even if the detectors happen to be so mounted that the difference between the angular values calculated from the outputs of the respective detectors becomes equal to 180°. In an initialization process after power on, the difference ?? between the angular values ?1 and ?2 calculated from the signals output from the respective detectors is stored as an initial value. Position data ? is output by taking an average between ?3 and ?2, where ?3 is a value obtained by correcting ?1 by the initial difference ??.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: November 17, 2009
    Assignee: Fanuc Ltd
    Inventors: Mitsuyuki Taniguchi, Hirofumi Kikuchi, Tadayoshi Matsuo
  • Publication number: 20090278711
    Abstract: A sensor arrangement and a method for the precise detection of relative movements between an encoder and a sensor, including an encoder, which has an incremental scale having a plurality of scale subdivisions (?), and a sensor which is magnetically coupled to the encoder via an air gap and includes at least two magnetic field sensor elements (SE1, SE2) which are arranged offset with respect to one another by a defined distance (?x) in the direction of the relative movement, the magnetic field sensor element output signals (V1, V2) having been shifted relative to one another by a relative-speed-dependent time difference with regard to the detection of a scale subdivision (?) or a defined part of a scale subdivision (N,S), the sensor having a signal processing circuit which comprises an interface module which generates a sensor output signal (IS3,IS4) including at least one speed signal based upon the time difference.
    Type: Application
    Filed: August 1, 2007
    Publication date: November 12, 2009
    Applicant: Continental Teves AG & Co. oHG
    Inventors: Peter Lohberg, Klaus Rink
  • Patent number: 7612689
    Abstract: In one embodiment of the present invention, a rotary encoding switch is disclosed such as used in the function setting for relays or similar. In one embodiment, a particularly secure function setting for relays or similar may be achieved by means of a rotary encoding switch with a number of switch stages with separations between the switch stages which are not constant.
    Type: Grant
    Filed: June 20, 2005
    Date of Patent: November 3, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Siegfried Neumann, Uwe Weiss
  • Patent number: 7592584
    Abstract: An optical encoder (100) is provided with: a light-emitting element (30) including a main-signal light-emitting element (31) having a red LED (31A) that emits red light and an origin light-emitting element (32) having an infrared LED (32A) that emits infrared light; and a receiver unit (40) including a main-signal photo detector (41) that receives the red light to generate a predetermined signal and an origin photo detector (42) that receives the infrared light to generate a predetermined signal. Accordingly, even when the infrared light enters the main-signal photo detector (41) or the red light enters the origin photo detector (42), no signal is generated by the light, thereby effectively preventing crosstalk. Thus, the measurement accuracy of the optical encoder (100) can be improved.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: September 22, 2009
    Assignee: Mitutoyo Corporation
    Inventors: Takanori Otsuka, Kazuhiko Kodama, Toru Yaku
  • Publication number: 20090184848
    Abstract: A rotary encoder includes a case made of insulating resin, a rotatable operation shaft, a slidable brush fixed to the operation shaft, and a signal contact embedded in a surface of the case. The slidable brush has a contacting section sliding on a surface of the case on a predetermined circumference according to a rotation of the operation shaft. The signal contact has an upper surface flush with the surface of the case, a first side surface connected to the upper surface at a first corner having a right angle, a second side surface connected to the upper surface at a second corner having a right angle, and a lower surface opposite to the upper surface. The first and side surfaces are positioned on the predetermined circumference. The lower surface has a width smaller than a width of the upper surface. This rotary encoder has a small size and outputs a signal precisely.
    Type: Application
    Filed: January 13, 2009
    Publication date: July 23, 2009
    Inventors: Jun SUGAHARA, Jun SATO, Takumi NISHIMOTO, Kenji KATAOKA
  • Patent number: 7547875
    Abstract: A high-precision absolute type encoder apparatus includes a controller electrically connected to an incremental type encoder and generating a control signal to the incremental type encoder, a comparator electrically connected to outputs of the incremental type encoder and generating first pulse signals, a latch unit electrically connected to outputs of the comparator and generating second pulse signals by latching the generating first pulse signals. When power failure occurs, the controller generates the control signal as successive pulses with predetermined period to drive the latch unit and the incremental type encoder. Therefore, the controller knows angular information of the incremental type encoder by counting the second pulse signals. The absolute angular information can be obtained by combining the angular information and an initial position after power failure.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: June 16, 2009
    Assignee: Delta Electronics, Inc.
    Inventors: Chin-Shiong Tsai, Po-Ming Chen, Meng-Chang Lin, Cheng-Ping Lin
  • Patent number: 7508323
    Abstract: A rotation-angle detecting apparatus detects a rotation angle of a rotating disc having radial markings, includes a plurality of detectors arranged at opposite sides of the axis of rotation of the disc and facing the markings, each of the detectors operable to detect a light beam from the markings, and outputting a pair of periodic signals having a 90-degree phase difference between the members of the pair; an analog-to-digital converter arranged to convert pairs of periodic signals from the detectors into pairs of digital signals; a digital signal processor configured to process the pairs of digital signals from the analog-to-digital converter; a binarization unit arranged to binarize the pairs of periodic signals from the detectors; and a counter arranged to count the pairs of periodic signals binarized by the binarization unit. The digital signal processor determines the rotation angle of the disc based on the pairs of digital signals from the analog-to-digital converter and count results from the counter.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: March 24, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Naoki Kawamata
  • Patent number: 7495583
    Abstract: A reflection-based optical encoding apparatus for the detection of position and/or motion of a mechanical device includes an encoding medium having at least a first reflective portion, and an encoder housing having a light-emitting source and a light-detecting sensor embedded within, the encoder housing being placed in proximity to the encoding medium such that a functional light path can be established from the light-emitting source to the light-detecting sensor via the first reflective portion of the encoding medium. The encoder housing includes a first flat facet positioned between the light-emitting source and the encoding medium, the first flat facet having a first angle relative to a common geometric plane such that light passing from the light-emitting source to the encoding medium is refracted along a first angled path in a manner that the refracted light strikes a desired location of the encoding medium.
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: February 24, 2009
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Teong Swee Tan, Premkumar S. Ramachandr, Yee Loong Chin, Cheng Why Tan, Weng Fei Wong
  • Patent number: 7462815
    Abstract: An encoder having a code carrier, light source, and detector is disclosed. The code carrier includes a track that emits light at each of a plurality of track points on the track when that track point is illuminated with light having a predetermined spectrum. Each of the track points emits light having a spectrum that is different from the spectrum emitted by others of the track points. The light source illuminates a portion of the track with light of the predetermined illumination spectrum. The detector provides a plurality of signals indicative of the spectrum of light leaving the portion of the track when the portion includes one of the track points. The code carrier moves with respect to the detector, and the signals define the relative position of the code carrier with respect to the detector.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: December 9, 2008
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Janet Bee Yin Chua, Yee Loong Chin
  • Patent number: 7463168
    Abstract: Various methods and apparatus relating to an encoder are disclosed.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: December 9, 2008
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David A. Rehmann, David K. Klaffenbach
  • Patent number: 7460030
    Abstract: An encoder failure detector system and method for detecting failure of an encoder during time periods when a zero rotational speed is expected. For example, in one embodiment a test signal is applied during a period when a zero rotational speed is expected and a failure is indicated if no movement of a rotor is detected in response to the test signal.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: December 2, 2008
    Assignee: Continental Automotive Systems US, Inc.
    Inventors: Kenneth J. Farkas, Duo Deng
  • Patent number: 7435945
    Abstract: A displacement measuring device including a scale, and an optical readhead including an index pattern and a light receiving element is provided. A bright/dark pattern arising from a scale grating is detected by the readhead to measure displacement. In various embodiments, a magnification of the pattern is adjusted by the spacing between at least a lens element, aperture element, and detection plane of the readhead. An aperture can be designed to provide a diffraction-limited telecentric imaging configuration that filters an image of the scale grating to provide a sinusoidal intensity pattern that supports highly interpolated measurements. An aperture dimension, selected in relation to the grating pitch and other parameters, can provide a desirable combination of readhead operating characteristics including one or more of a desired depth of field; degree of spatial filtering; and optical signal power.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: October 14, 2008
    Assignee: Mitutoyo Corporation
    Inventors: Toshitaka Shimomura, Shingo Nihommori, Miyako Mizutani
  • Patent number: 7432497
    Abstract: An absolute linear encoder includes a plurality of absolute scales aligned in the detection direction with absolute calibrations, a plurality of detectors for detecting the calibrations on the absolute scales, absolute position data generating portions of each scale for generating absolute position data of each detector, and a calculator for outputting an absolute position over the whole length of connected whole absolute scales adding the absolute position data of each detector and the distance between the detectors. The detectors are fixed at such intervals as to simultaneously detect the calibrations of the two absolute scales adjoining in a scale connecting section. Thus, the long absolute linear encoder which is easy to use is realized at low costs.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: October 7, 2008
    Assignee: Mitutoyo Corporation
    Inventors: Seiji Sakagami, Mikiya Teraguchi
  • Patent number: 7400269
    Abstract: An optical encoder. The optical encoder includes a coding element, an emitter, and a detector. The coding element has a track with a track pattern. The track pattern includes a plurality of optically distinguishable sections. The plurality of optically distinguishable sections includes a limit switch section. The emitter generates a light signal incident on the track of the coding element. The detector includes a limit switch photodetector positioned to detect the light signal from the emitter. The detector generates a limit switch output signal in response to the detected light signal above a limit switch threshold at the limit switch photodetector. Embodiments of this type of optical encoder implement limit switches into a single track on the coding element.
    Type: Grant
    Filed: November 9, 2006
    Date of Patent: July 15, 2008
    Assignee: Avago Technologies ECBU IP Pte Ltd
    Inventors: Weng Fei Wong, Chee Foo Lum
  • Patent number: 7397393
    Abstract: To provide encoder count error detection circuitry and an encoder count error detection method capable of realizing a highly reliable encoder by providing detection of the count errors of count signals used to measure displacement, an encoder count error detection circuitry and detection method configured as count error detection circuitry for an encoder outputting pulse trains according to the displacement of a measured object, doubles, triples, or quadruples one or more fundamental signals used for measuring displacement to convert to count signals, and compares the output signals of the counter counting these count signals with the level of these fundamental signals to detect count errors in the count signals.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: July 8, 2008
    Assignee: Dr. Johannes Heidenhain GmbH
    Inventor: Takeshi Yamamoto
  • Patent number: 7397394
    Abstract: A method for determining the absolute value of a rotational angle includes imaging a continuous segment of a code track of a code carrier on a sensor array such that the sensor array generates a corresponding output signal. The code track has a light and dark transition pattern over an angular range of 360°. The sensor array output signal is subjected to a convolution operation with a reference signal in a first correlation filter to reconstruct the light and dark transition pattern of the imaged segment of the code track as a first correlation function signal. The first correlation function signal is processed to determine a code word and a predetermined angle corresponding to the code word.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: July 8, 2008
    Assignee: Leopold Kostal GmbH & Co. KG
    Inventor: Michael Köster
  • Publication number: 20080129549
    Abstract: An encoder failure detector system and method for detecting failure of an encoder during time periods when a zero rotational speed is expected. For example, in one embodiment a test signal is applied during a period when a zero rotational speed is expected and a failure is indicated if no movement of a rotor is detected in response to the test signal.
    Type: Application
    Filed: December 5, 2006
    Publication date: June 5, 2008
    Inventors: Kenneth J. Farkas, Duo Deng
  • Patent number: 7358865
    Abstract: An optical encoder includes a cylindrical reflective scale, a point light source for irradiating the reflective scale, and light-receiving elements for receiving the light beams reflected by the reflective scale. The pitch of the reflective scale is set to an appropriate value such that the pitch of interference fringes formed by light beams that are reflected by the reflective scale is matched to the pitch of the light-receiving elements at a position with a desired gap.
    Type: Grant
    Filed: August 28, 2006
    Date of Patent: April 15, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiko Igaki, Akio Atsuta