Patents by Inventor Naoki Kawamata
Naoki Kawamata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240149503Abstract: A molding device includes: a lower mold that supports a workpiece containing a thermoplastic resin and that is heated to a first predetermined temperature; an upper mold that is opposed to the lower mold, that presses the workpiece, and that is heated to a second predetermined temperature; a transferer that moves the lower mold and the upper mold relative to each other in a transfer direction of the workpiece; and control circuitry. The lower mold includes temperature-controlled regions adjacent to one another in the transfer direction, the temperature-controlled regions including a first lower mold temperature-controlled region and a second lower mold temperature-controlled region having a temperature lower than a temperature of the first lower mold temperature-controlled region. The control circuitry changes proportions of the first and second lower mold temperature-controlled regions in the lower mold as a function of a relative position between the upper and lower molds.Type: ApplicationFiled: January 10, 2024Publication date: May 9, 2024Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Kenshiro OKUMURA, Takaya HAMAMOTO, Sayaka OCHI, Naoki SHIMADA, Akio KAWAMATA, Yuya OUCHI
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Patent number: 8706269Abstract: A controller which generates a driving instruction to control driving of an object while detecting a position of the object based on two periodic signals that are provided by an encoder and have different phases, comprises a counter configured to count periods of one of the two periodic signals, and a processor configured to detect the position of the object based on an arctangent value of a ratio of values of the two periodic signals and a count value provided by the counter, and to generate the driving instruction based on the position, wherein the processor is configured to compensates an error in the count value based on the driving instruction generated in the past and an acceleration of the object computed based on the arctangent value and the count value, and to compute the position of the object based on the compensated count value.Type: GrantFiled: January 19, 2010Date of Patent: April 22, 2014Assignee: Canon Kabushiki KaishaInventor: Naoki Kawamata
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Publication number: 20100185340Abstract: A controller which generates a driving instruction to control driving of an object while detecting a position of the object based on two periodic signals that are provided by an encoder and have different phases, comprises a counter configured to count periods of one of the two periodic signals, and a processor configured to detect the position of the object based on an arctangent value of a ratio of values of the two periodic signals and a count value provided by the counter, and to generate the driving instruction based on the position, wherein the processor is configured to compensates an error in the count value based on the driving instruction generated in the past and an acceleration of the object computed based on the arctangent value and the count value, and to compute the position of the object based on the compensated count value.Type: ApplicationFiled: January 19, 2010Publication date: July 22, 2010Applicant: CANON KABUSHIKI KAISHAInventor: Naoki Kawamata
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Patent number: 7508323Abstract: 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: GrantFiled: February 13, 2008Date of Patent: March 24, 2009Assignee: Canon Kabushiki KaishaInventor: Naoki Kawamata
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Publication number: 20080211694Abstract: 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: ApplicationFiled: February 13, 2008Publication date: September 4, 2008Applicant: CANON KABUSHIKI KAISHAInventor: Naoki Kawamata
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Patent number: 7202979Abstract: An apparatus for optically detecting rotational position information of a rotating object, includes a light source, a detector which is located at a position to receive scattered light from the rotating object when the rotating object is irradiated with a light beam from the light source, and outputs a frequency signal based on the scattered light, a signal processing system for detecting rotational position information by performing signal processing for the frequency signal from the detector, and a rotation control system for controlling rotation of the rotating object. The rotation control system preliminarily rotates the rotating object in detecting the rotational position information.Type: GrantFiled: August 11, 2004Date of Patent: April 10, 2007Assignee: Canon Kabushiki KaishaInventors: Makoto Takamiya, Naoki Kawamata
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Patent number: 7154947Abstract: This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector which outputs at least two periodical signals in accordance with the displacement of an object, a digital interpolator which processes the periodical signal output from the detector at a predetermined time interval to generate a displacement or angle at a period shorter than the period of the periodical signal, a pulse generation unit which generates a constant frequency pulse signal, a counter which counts the pulse signal output from the pulse generation unit, and a pulse conversion unit which calculates a value to be set in the counter from the difference between displacement information corresponding to the target position of the object and the output from the digital interpolator.Type: GrantFiled: April 15, 2003Date of Patent: December 26, 2006Assignee: Canon Kabushiki KaishaInventor: Naoki Kawamata
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Publication number: 20050007919Abstract: An apparatus for optically detecting rotational position information of a rotating object, includes a light source, a detector which is located at a position to receive scattered light from the rotating object when the rotating object is irradiated with a light beam from the light source, and outputs a frequency signal based on the scattered light, a signal processing system for detecting rotational position information by performing signal processing for the frequency signal from the detector, and a rotation control system for controlling rotation of the rotating object. The rotation control system preliminarily rotates the rotating object in detecting the rotational position information.Type: ApplicationFiled: August 11, 2004Publication date: January 13, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Makoto Takamiya, Naoki Kawamata
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Patent number: 6829118Abstract: An apparatus for optically detecting rotational position information of a rotating object, includes a light source, a detector which is located at a position to receive scattered light from the rotating object when the rotating object is irradiated with a light beam from the light source, and outputs a frequency signal based on the scattered light, a signal processing system for detecting rotational position information by performing signal processing for the frequency signal from the detector, and a rotation control system for controlling rotation of the rotating object. The rotation control system preliminarily rotates the rotating object in detecting the rotational position information.Type: GrantFiled: November 3, 2000Date of Patent: December 7, 2004Assignee: Canon Kabushiki KaishaInventors: Makoto Takamiya, Naoki Kawamata
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Publication number: 20030194034Abstract: This invention is to allow accurate high-speed coincidence detection while preventing any increase in circuit scale. To achieve this object, a coincidence detection apparatus includes a detector which outputs at least two periodical signals in accordance with the displacement of an object, a digital interpolator which processes the periodical signal output from the detector at a predetermined time interval to generate a displacement or angle at a period shorter than the period of the periodical signal, a pulse generation unit which generates a constant frequency pulse signal, a counter which counts the pulse signal output from the pulse generation unit, and a pulse conversion unit which calculates a value to be set in the counter from the difference between displacement information corresponding to the target position of the object and the output from the digital interpolator.Type: ApplicationFiled: April 15, 2003Publication date: October 16, 2003Inventor: Naoki Kawamata
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Patent number: 6631047Abstract: An apparatus having a first system for forming a composite light beam of two light beams to be made to interfere with each other, a splitting member for amplitude-splitting the composite light beam into three or more split light beams in the same area, and a second system for obtaining interference light beams of different phases from the plurality of split light beams.Type: GrantFiled: September 18, 1998Date of Patent: October 7, 2003Assignee: Canon Kabushiki KaishaInventors: Kou Ishizuka, Hidejiro Kadowaki, Naoki Kawamata, Hiroyuki Hagiwara, Makoto Takamiya, Shigeki Kato, Hiroyuki Shiomi
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Publication number: 20030133219Abstract: This specification discloses an apparatus comprising a first system for forming a composite light beam of two light beams to be made to interfere with each other, a splitting member for amplitude-splitting the composite light beam into three or more splitted light beams in the same area, and a second system for obtaining interference light beams of different phases from the plurality of splitted light beams.Type: ApplicationFiled: September 18, 1998Publication date: July 17, 2003Inventors: KOU ISHIZUKA, HIDEJIRO KADOWAKI, NAOKI KAWAMATA, HIROYUKI HAGIWARA, MAKOTO TAKAMIYA, SHIGEKI KATO, HIROYUKI SHIOMI
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Patent number: 6057976Abstract: An angular division apparatus for circumferentially dividing a rotating object into a plurality of areas by using Doppler pulses includes an optical head for applying a beam emitted from a light source unit to a rotating object and detecting Doppler pulses based on a shift of the frequency of the light scattered from the rotating object, and a counting unit for counting the Doppler pulses output from the optical head to determine the number of pulses for one revolution of the rotating object. The number of Doppler pulses for one revolution is divided by a division number for dividing the rotating object into a plurality of areas in the angular direction. The rotating object is divided into a plurality of areas in the angular direction thereof by using the number of Doppler pulses per divided area.Type: GrantFiled: September 9, 1997Date of Patent: May 2, 2000Assignee: Canon Kabushiki KaishaInventors: Yasuhiko Ishida, Naoki Kawamata
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Patent number: 6043622Abstract: A one-phase electromagnetic motor drive controller includes a one-phase electromagnetic motor, a position detection mechanism for detecting a rotational position of the motor and a control mechanism for controlling the drive of the one-phase electromagnetic motor from the detected rotational position. When the torque constant of the motor is used as a parameter of a control calculation, the torque constant parameter is corrected by the relationship between it and the rotational position of the electromagnetic motor.Type: GrantFiled: April 23, 1998Date of Patent: March 28, 2000Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Shiomi, Naoki Kawamata, Jun Ashiwa
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Patent number: 5930066Abstract: An apparatus records information on a hard disk with a magnetic head arm provided in a hard disk drive. The apparatus comprises an interference measuring system, containing an outgoing portion for a measuring light beam to the arm and a reference light forming portion, for obtaining relative displacement information with respect to the arm by interfering the reference light with reflected light of the measuring light from the arm or a slider belonging to the arm, the interference measuring system having a light beam deflecting member for deflecting the measuring light and thus guiding the measuring light to a lateral surface of the arm or of the slider, a control system for generating a signal for positioning the arm with respect to the hard disk on the basis of the relative displacement information obtained by the interference measuring system, and a signal system for transmitting a signal for recording information on the hard disk to the magnetic head.Type: GrantFiled: August 26, 1997Date of Patent: July 27, 1999Assignee: Canon Kabushiki KaishaInventors: Kou Ishizuka, Hidejiro Kadowaki, Naoki Kawamata, Hiroyuki Hagiwara, Jun Ashiwa
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Patent number: 5719789Abstract: This invention relates to a method of and an apparatus for detecting the amount of displacement of an object by the use of two periodic signals having a predetermined phase difference therebetween which are outputted in conformity with the displacement of the object. The apparatus has means for detecting the two periodic signals, means for calculating the ratio between the two periodic signals, and means for obtaining the amount of displacement of the object from the value of the ratio by reference to prestored data.Type: GrantFiled: September 20, 1995Date of Patent: February 17, 1998Assignee: Canon Kabushiki KaishaInventor: Naoki Kawamata
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Patent number: 5666158Abstract: An image pick-up apparatus includes a detection circuit for detecting vibration of the apparatus body, a correction system for correcting the vibration by shifting an image, and a control circuit for controlling driving of the correction system in accordance with an output of the detection circuit. A closed loop frequency characteristic is constituted as a notch filter, and a blocking frequency of the notch filter is made variable on the basis of changes in the detected vibration frequency.Type: GrantFiled: June 5, 1995Date of Patent: September 9, 1997Assignee: Canon Kabushiki KaishaInventors: Masayoshi Sekine, Jun Tokumitsu, Toshiaki Kondo, Koji Takahashi, Isao Harigaya, Naoki Kawamata
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Patent number: 5612602Abstract: A positioning device and method includes a motor having a rotation axis, a driver for driving the motor on the basis of control information, a detector for detecting position information of the rotation axis of the motor, and a digital signal processor for performing an operation on the control information in accordance with the position information detected by the detector.Type: GrantFiled: January 3, 1994Date of Patent: March 18, 1997Assignee: Canon Kabushiki KaishaInventors: Yoichi Kubota, Naoki Kawamata, Masahiro Morisada, Katsuhiro Fujii, Hiroshi Itoh, Hiroaki Takeishi
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Patent number: 5477400Abstract: A tape transport system control device for controlling a tape transport system in which a tape payed out from a supply-side reel driven by a supply-side reel motor travels through a predetermined path to be taken up on a takeup-side reel driven by a takeup-side reel motor, includes a tape speed control servoloop for the takeup-side reel motor, a tape tension control servoloop for the supply-side reel motor, a detecting part arranged to detect a difference between a tape tension obtained on the side of the supply-side reel and a tape tension obtained on the side of the takeup-side reel, and a loop arranged to feed the detected difference of tension forward to the supply-side reel motor.Type: GrantFiled: July 30, 1993Date of Patent: December 19, 1995Assignee: Canon Kabushiki KaishaInventor: Naoki Kawamata