Patents by Inventor Yoshi Ishizuka
Yoshi Ishizuka 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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Patent number: 8896821Abstract: To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.Type: GrantFiled: March 18, 2013Date of Patent: November 25, 2014Assignee: Sanyo Denki Co., Ltd.Inventors: Tooru Miyajima, Yoshi Ishizuka, Shoji Ito
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Publication number: 20130242289Abstract: To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.Type: ApplicationFiled: March 18, 2013Publication date: September 19, 2013Applicant: Sanyo Denki Co., Ltd.Inventors: Tooru Miyajima, Yoshi Ishizuka, Shoji Ito
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Patent number: 8389925Abstract: An optical encoder device is provided, in which the number of light transmissive slits of a stationary slit plate can be increased as much as possible according to the length of a light receiving surface of a light receiving element to produce an output signal with little distortion. A movable slit plate 3 includes a slit row R1 in which a plurality of light transmissive slits (light transmissive portions) S1 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits (light non-transmissive portions) S2 each having a slit width of 180° in terms of electrical angle are alternately formed. A stationary slit plate 4 includes a slit row R2 in which a plurality of light transmissive slits S3 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits S4 each having a slit width of (360Xk-180)° in terms of electrical angle are alternately formed.Type: GrantFiled: March 6, 2009Date of Patent: March 5, 2013Assignee: Sanyo Denki Co., Ltd.Inventors: Yoshihiro Shoji, Yoshi Ishizuka, Shoji Ito
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Publication number: 20110036970Abstract: An optical encoder device is provided, in which the number of light transmissive slits of a stationary slit plate can be increased as much as possible according to the length of a light receiving surface of a light receiving element to produce an output signal with little distortion. A movable slit plate 3 includes a slit row R1 in which a plurality of light transmissive slits (light transmissive portions) S1 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits (light non-transmissive portions) S2 each having a slit width of 180° in terms of electrical angle are alternately formed. A stationary slit plate 4 includes a slit row R2 in which a plurality of light transmissive slits S3 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits S4 each having a slit width of (360Xk-180)° in terms of electrical angle are alternately formed.Type: ApplicationFiled: March 6, 2009Publication date: February 17, 2011Applicant: SANYO DENKI CO., LTD.Inventors: Yoshihiro Shoji, Yoshi Ishizuka, Shoji Ito
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Patent number: 7047145Abstract: A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was obtained from a static error compensation. The position detection circuit outputs a compensated detected position signal in which a static error has been compensated. The differential circuit differentiates the compensated detected position signal to obtain a rotational speed of the resolver. Based on a signal representing the rotational speed output from the differential circuit, the phase data memory device and the peak value memory device send the variation in phase and the amplitude peak value, respectively, of the dynamic error signal to the multiplication device. The multiplication device calculates an estimated dynamic error and the subtraction circuit removes the estimated dynamic error from the compensated detected position signal.Type: GrantFiled: July 16, 2004Date of Patent: May 16, 2006Assignee: Sanyo Denki Co., Ltd.Inventors: Yoshi Ishizuka, Kazuhiro Makiuchi, Toru Miyajima
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Publication number: 20050033539Abstract: A resolver detected position compensation system for a resolver is provided that can enhance a position detection precision by performing a further compensation on a compensated position that was obtained from a static error compensation. The position detection circuit 5 outputs a compensated detected position signal in which a static error has been compensated. The differential circuit 11 differentiates the compensated detected position signal to obtain a rotational speed of the resolver. Based on a signal representing the rotational speed output from the differential circuit 11, the phase data memory means 15 and the peak value memory means 17 send the variation in phase and the amplitude peak value, respectively, of the dynamic error signal to the multiplication means 19. The multiplication means 19 calculates an estimated dynamic error and the subtraction circuit 21 removes the estimated dynamic error from the compensated detected position signal.Type: ApplicationFiled: July 16, 2004Publication date: February 10, 2005Applicant: Sanyo Denki Co., LtdInventors: Yoshi Ishizuka, Kazuhiro Makiuchi, Toru Miyajima
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Patent number: D627721Type: GrantFiled: December 4, 2009Date of Patent: November 23, 2010Assignee: Sanyo Denki Co., Ltd.Inventors: Daigo Kuraishi, Yoshi Ishizuka, Akira Shimizu, Tomoharu Sekine, Yutaka Nishimiya
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Patent number: D627722Type: GrantFiled: December 4, 2009Date of Patent: November 23, 2010Assignee: Sanyo Denki Co., Ltd.Inventors: Daigo Kuraishi, Yoshi Ishizuka, Akira Shimizu, Tomoharu Sekine, Yutaka Nishimiya
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Patent number: D627723Type: GrantFiled: December 4, 2009Date of Patent: November 23, 2010Assignee: Sanyo Denki Co., Ltd.Inventors: Daigo Kuraishi, Yoshi Ishizuka, Akira Shimizu, Tomoharu Sekine, Yutaka Nishimiya