Patents by Inventor Hiroaki Kawada
Hiroaki Kawada 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: 20230047411Abstract: A black matrix substrate assembly including a transparent substrate, a black matrix pattern, a transparent resin layer, a resin wall pattern, a light reflective layer, and a transparent protective layer. The black matrix pattern includes first and second black linear segments with a width Ax of each first segment in a first direction. The resin wall pattern includes first and second wall linear segments with a width Dx of each first segment smaller than the width Ax in the first direction and the center line of each first segment aligned with that of the corresponding first black linear segment. The light reflective layer includes first and second reflective linear segments with a width Cx of each first segment larger than the width Dx in the first direction and the center line of each first segment aligned with that of the corresponding first black linear segment.Type: ApplicationFiled: October 28, 2022Publication date: February 16, 2023Applicant: TOPPAN Inc.Inventors: Hiroaki KAWADA, Kenzo FUKUYOSHI
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Patent number: 9329059Abstract: A photoelectric encoder includes an irradiation unit configured to apply first and second irradiation light beams having a first linear polarization direction, a scale configured to produce first and second diffraction light beams having the first linear polarization direction by diffracting the first and second irradiation light beams, respectively, the scale having a glass plate whose front surface has a grating shape, a polarizing unit configured to convert the first diffraction light beam into a third diffraction light beam having a second linear polarization direction which is perpendicular to the first linear polarization direction, to produce first and second composite light beams by combining the second diffraction light beam and the third diffraction light beam, and to convert the first composite light beam into a circularly polarized third composite light beam, and a light receiver configured to receive the second composite light beam and the third composite light beam.Type: GrantFiled: February 14, 2013Date of Patent: May 3, 2016Assignee: MITUTOYO CORPORATIONInventors: Kenichi Hayashi, Hiroaki Kawada
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Patent number: 9097560Abstract: An optical encoder includes a detection head. The detection head includes an optical system including a lens including a pair of bosses integrally formed with the lens and disposed with an optical axis of the lens therebetween, and an aperture plate having a pair of reference-pin-insertion holes disposed with an aperture therebetween; a housing including a pair of attachment portions and having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on a central symmetry plane; a lens holder having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on the central symmetry plane; and a pair of reference pins for positioning the lens holder and the aperture plate relative to the housing. An optical axis of the optical system is adjusted with respect to the bosses and the reference pins.Type: GrantFiled: June 7, 2013Date of Patent: August 4, 2015Assignee: MITUTOYO CORPORATIONInventors: Kimitoshi Ono, Hiroaki Kawada
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Patent number: 8739424Abstract: In a structure for protecting scale graduations, in which a graduation unit formed on a scale base is protected by a scale cover arranged on the top surface side of the graduation unit, a space between the scale base and the scale cover along the entire lateral periphery of the graduation unit is sealed using an adhesive agent mixed with a powder material such as a glass powder for blocking penetration of graduations-deteriorating components, to form a periphery adhesive layer. The scale cover may be supported on the scale base by a height regulating unit provided along the periphery of the graduation unit, so that variations in encoder output due to unevenness in thickness of the adhesive agent for joining the scale cover with the graduation unit can be prevented.Type: GrantFiled: June 15, 2012Date of Patent: June 3, 2014Assignee: Mitutoyo CorporationInventor: Hiroaki Kawada
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Publication number: 20130327930Abstract: An optical encoder includes a detection head. The detection head includes an optical system including a lens including a pair of bosses integrally formed with the lens and disposed with an optical axis of the lens therebetween, and an aperture plate having a pair of reference-pin-insertion holes disposed with an aperture therebetween; a housing including a pair of attachment portions and having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on a central symmetry plane; a lens holder having a pair of lens-boss-insertion holes and a pair of reference-pin-insertion holes disposed on the central symmetry plane; and a pair of reference pins for positioning the lens holder and the aperture plate relative to the housing. An optical axis of the optical system is adjusted with respect to the bosses and the reference pins.Type: ApplicationFiled: June 7, 2013Publication date: December 12, 2013Inventors: Kimitoshi Ono, Hiroaki Kawada
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Patent number: 8546746Abstract: A photoelectric encoder includes a scale in which diffraction gratings are formed at predetermined pitches in a measurement axis direction, a detection head which is relatively movable with respect to the scale, and which includes an illuminating portion configured to illuminate the scale, and a light receiving portion configured to receive light reflected by or transmitted through the diffraction gratings of the scale, a signal processing device configured to process a light reception signal output from the light receiving portion of the detection head, and a signal transmitting unit configured to transmit a signal between the detection head and the signal processing device. The signal processing device includes a display unit configured to display information indicating an attachment posture of the detection head with respect to the scale.Type: GrantFiled: October 10, 2011Date of Patent: October 1, 2013Assignee: Mitutoyo CorporationInventors: Hiroatsu Mori, Tsuyoshi Kuroiwa, Yuichi Ichikawa, Hiroaki Kawada
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Patent number: 8395535Abstract: A photoelectric encoder has a scale in which a main track for detecting an amount of movement is formed in a measuring direction. The photoelectric encoder includes an origin signal generating portion provided at a part of the main track in a direction orthogonal to the measuring direction. Thereby, change in a light receiving signal due to passage of the origin signal generating portion is detected to generate an origin signal. Thus, the origin signal which is in agreement with a main signal in phase is obtained and improve the reproducibility of an origin position.Type: GrantFiled: May 9, 2011Date of Patent: March 12, 2013Assignee: Mitutoyo CorporationInventor: Hiroaki Kawada
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Patent number: 8395108Abstract: A photoelectric encoder includes: a scale; a detection head; fibers through which light that is to be irradiated on the scale and light reflected by the scale propagates; first and second cables each having a space in which the fibers are partially disposed; and a case that encloses a light source that supplies light to one of the fibers and a light-sensitive element that receives the reflected light propagating through the others of the fibers and converts the received light into an electric signal. The first cable, the second cable, and the case are disposed in this order in the direction of propagation of the reflected light. The positions of the fibers are fixed relative to one another inside the first cable in the direction orthogonal to the direction of length of the fibers and variable relative to one another inside the second cable in the orthogonal direction.Type: GrantFiled: August 4, 2010Date of Patent: March 12, 2013Assignee: Mitutoyo CorporationInventors: Hiroatsu Mori, Hiroaki Kawada
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Publication number: 20120324750Abstract: In a structure for protecting scale graduations, in which a graduation unit formed on a scale base is protected by a scale cover arranged on the top surface side of the graduation unit, a space between the scale base and the scale cover along the entire lateral periphery of the graduation unit is sealed using an adhesive agent mixed with a powder material such as a glass powder for blocking penetration of graduations-deteriorating components, to form a periphery adhesive layer. The scale cover may be supported on the scale base by a height regulating unit provided along the periphery of the graduation unit, so that variations in encoder output due to unevenness in thickness of the adhesive agent for joining the scale cover with the graduation unit can be prevented.Type: ApplicationFiled: June 15, 2012Publication date: December 27, 2012Applicant: MITUTOYO CORPORATIONInventor: Hiroaki Kawada
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Publication number: 20120097843Abstract: A photoelectric encoder includes a scale in which diffraction gratings are formed at predetermined pitches in a measurement axis direction, a detection head which is relatively movable with respect to the scale, and which includes an illuminating portion configured to illuminate the scale, and a light receiving portion configured to receive light reflected by or transmitted through the diffraction gratings of the scale, a signal processing device configured to process a light reception signal output from the light receiving portion of the detection head, and a signal transmitting unit configured to transmit a signal between the detection head and the signal processing device. The signal processing device includes a display unit configured to display information indicating an attachment posture of the detection head with respect to the scale.Type: ApplicationFiled: October 10, 2011Publication date: April 26, 2012Applicant: MITUTOYO CORPORATIONInventors: Hiroatsu Mori, Tsuyoshi Kuroiwa, Yuichi Ichikawa, Hiroaki Kawada
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Publication number: 20110272564Abstract: A photoelectric encoder has a scale in which a main track for detecting an amount of movement is formed in a measuring direction. The photoelectric encoder includes an origin signal generating portion provided at a part of the main track in a direction orthogonal to the measuring direction. Thereby, change in a light receiving signal due to passage of the origin signal generating portion is detected to generate an origin signal. Thus, the origin signal which is in agreement with a main signal in phase is obtained and improve the reproducibility of an origin position.Type: ApplicationFiled: May 9, 2011Publication date: November 10, 2011Applicant: MITUTOYO CORPORATIONInventor: Hiroaki KAWADA
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Patent number: 8054565Abstract: The present invention provides: a lens optical system having: a plastic lens; and a lens restraining member for mechanically restraining a thermal expansion of the plastic lens to control a variation of a curvature of lens due to a temperature change so as to suppress a variation of a focal position due to a temperature change; and a photoelectric encoder including the lens optical system.Type: GrantFiled: June 26, 2007Date of Patent: November 8, 2011Assignee: Mitutoyo CorporationInventor: Hiroaki Kawada
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Patent number: 7934324Abstract: A linear scale that is used for displacement measurement is provided. The linear scale includes a scale board, a graduation unit, and an attachment unit. The scale board is made of low expansion ceramics. The graduation unit is fixed to an upper surface of the scale board. The graduation unit is read at the time of measurement. The attachment unit is a unit for attaching the scale board to a base member.Type: GrantFiled: March 23, 2010Date of Patent: May 3, 2011Assignee: Mitutoyo CorporationInventors: Masaki Tomiya, Hiroaki Kawada
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Publication number: 20110031382Abstract: A photoelectric encoder includes: a scale; a detection head; fibers through which light that is to be irradiated on the scale and light reflected by the scale propagates; first and second cables each having a space in which the fibers are partially disposed; and a case that encloses a light source that supplies light to one of the fibers and a light-sensitive element that receives the reflected light propagating through the others of the fibers and converts the received light into an electric signal. The first cable, the second cable, and the case are disposed in this order in the direction of propagation of the reflected light. The positions of the fibers are fixed relative to one another inside the first cable in the direction orthogonal to the direction of length of the fibers and variable relative to one another inside the second cable in the orthogonal direction.Type: ApplicationFiled: August 4, 2010Publication date: February 10, 2011Applicant: MITUTOYO CORPORATIONInventors: Hiroatsu Mori, Hiroaki Kawada
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Publication number: 20100242295Abstract: A linear scale that is used for displacement measurement is provided. The linear scale includes a scale board, a graduation unit, and an attachment unit. The scale board is made of low expansion ceramics. The graduation unit is fixed to an upper surface of the scale board. The graduation unit is read at the time of measurement. The attachment unit is a unit for attaching the scale board to a base member.Type: ApplicationFiled: March 23, 2010Publication date: September 30, 2010Applicant: MITUTOYO CORPORATIONInventors: Masaki Tomiya, Hiroaki Kawada
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Patent number: 7589899Abstract: The present invention provides: a lens optical system having a lens and a plastic block having two parallel planes, the plastic block being provided between the lens and a focal position of the lens to suppress a variation of a focal length due to a temperature change, and a photoelectric encoder including the lens optical system.Type: GrantFiled: June 22, 2007Date of Patent: September 15, 2009Assignee: Mitutoyo CorporationInventor: Hiroaki Kawada
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Patent number: 7554078Abstract: A photoelectric encoder using a lens array for dividing an image of a scale pattern into a plurality of regions to be detected and focusing them onto an array of light receiving elements, comprises, between the scale pattern and the lens array, a light-shielding array for reducing the effect of external disturbance light. The light-shielding array may be formed as a thin film pattern on a lens array side of a transparent cover glass which provides internal protection.Type: GrantFiled: June 26, 2007Date of Patent: June 30, 2009Assignee: Mitutoyo CorporationInventor: Hiroaki Kawada
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Patent number: 7446306Abstract: In a photoelectric encoder (incremental encoder and absolute encoder) having a detector that is displaceable relative to a scale having a predetermined pattern (incremental pattern and pseudorandom pattern) formed thereon, the detection range, to be simultaneously detected, of the pattern is divided in at least the detection direction, and a plurality of light-receiving systems are provided to detect each of the respective detection areas, whereby measurement of a wide detection range is enabled by using a small-sized and simple optical system and light-receiving system.Type: GrantFiled: February 15, 2007Date of Patent: November 4, 2008Assignee: Mitutoyo CorporationInventors: Toru Yaku, Hiroaki Kawada
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Publication number: 20080121788Abstract: A photoelectric encoder using a lens array for dividing an image of a scale pattern into a plurality of regions to be detected and focusing them onto an array of light receiving elements, comprises, between the scale pattern and the lens array, a light-shielding array for reducing the effect of external disturbance light. The light-shielding array may be formed as a thin film pattern on a lens array side of a transparent cover glass which provides internal protection.Type: ApplicationFiled: June 26, 2007Publication date: May 29, 2008Applicant: MITUTOYO CORPORATIONInventor: Hiroaki Kawada
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Publication number: 20080106796Abstract: The present invention provides: a lens optical system having: a plastic lens; and a lens restraining member for mechanically restraining a thermal expansion of the plastic lens to control a variation of a curvature of lens due to a temperature change so as to suppress a variation of a focal position due to a temperature change; and a photoelectric encoder including the lens optical system.Type: ApplicationFiled: June 26, 2007Publication date: May 8, 2008Applicant: MITUTOYO CORPORATIONInventor: Hiroaki Kawada