Patents by Inventor Ryuichiro Mizuno

Ryuichiro Mizuno 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).

  • Publication number: 20210364802
    Abstract: An objective of the present disclosure is to provide an image display device capable of suppressing stray light and outputting a high-quality video. An image display device according to the present disclosure comprises a protective cover covering a periphery of a light guide, wherein the protective cover comprises a concave lens and a convex lens, wherein the concave lens and the light guide are disposed at intervals of 4 mm or less, and wherein the convex lens and the light guide are disposed at intervals of 5 mm or less.
    Type: Application
    Filed: April 19, 2021
    Publication date: November 25, 2021
    Inventors: Masahito UCHIYAMA, Toshiteru NAKAMURA, Takuma KUNO, Ryuichiro MIZUNO, Kazuhiko KUZUMAKI
  • Publication number: 20180266752
    Abstract: A thermal insulating profile includes: a first profile portion made of metal; a second profile portion made of metal; a thermal insulating material made of a foaming resin material, the thermal insulating material being configured to couple the first profile portion and the second profile portion to each other; an injection port formed, along a longitudinal direction of the thermal insulating profile, between the first profile portion and the second profile portion; and a closing member disposed at the injection port to close the injection port.
    Type: Application
    Filed: October 11, 2017
    Publication date: September 20, 2018
    Inventors: Ryuichiro Mizuno, Akiyuki Kuriyama, Tomoaki Eguchi
  • Publication number: 20180224199
    Abstract: A thermal insulating profile includes: a metal profile including a first profile portion, a second profile portion, and a cavity forming portion in which an injection port along a longitudinal direction of the first profile portion and the second profile portion is formed and in which a cavity communicated with the injection port is formed between the first profile portion and the second profile portion, the cavity forming portion including a portion on a first profile portion side and a portion on a second profile portion side that are disposed with a gap therebetween; and a thermal insulating material formed from a foaming resin material and disposed in the cavity.
    Type: Application
    Filed: October 11, 2017
    Publication date: August 9, 2018
    Inventors: Ryuichiro Mizuno, Akiyuki Kuriyama, Tomoaki Eguchi
  • Publication number: 20150117172
    Abstract: An optical pickup includes a pair of first tracking coils near the center of the lens holder in the tracking direction on one side of the holder; a pair of first magnets facing the first tracking coils and near the outer sides of the holder in the tracking direction; a pair of second tracking coils near the outer sides of the holder on another side of the holder; and a pair of second magnets facing the second tracking coils and near the center of the holder. The vertical electromagnetic force F in each of the first tracking coils is larger than the vertical electromagnetic force f in each of the second tracking coils. A distance K between the action center of the force F and the support center of the movable part is shorter than a distance k between the action center of the force f and the support center.
    Type: Application
    Filed: October 30, 2014
    Publication date: April 30, 2015
    Inventors: Tatsuya YAMASAKI, Katsuhiko KIMURA, Ryuichiro MIZUNO
  • Patent number: 8743668
    Abstract: In an optical pickup equipped with a semiconductor laser, electro-optical components such as a lens, and an objective lens drive device, the objective lens drive device includes objective lenses, a holder holding the objective lenses, a focusing coil, and tracking coils. The focusing coil is wound in parallel to the optical surface of the objective lens, and formed in a parallelogram shape having inclined portions provided near the tracking coils. The two tracking coils are placed on diagonal portions of the lens holder.
    Type: Grant
    Filed: December 14, 2010
    Date of Patent: June 3, 2014
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Yoshihiro Sato, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura, Seiichi Kato
  • Patent number: 8711666
    Abstract: In an optical pickup device for use in recording and reproducing on an optical recording medium, such as a CD or DVD, banks are formed on both sides of an adhesive agent application position for adhering an optical device, such as a photodetector or a laser diode, in an optical pickup case. At this time, a bank on the side of an optical path is formed higher than a height of an outer bank, and an adhesive agent is poured between the banks, to adhere the optical pickup case and the optical device.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: April 29, 2014
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Akiko Mizushima, Hiroaki Furuichi, Kazuhiko Ito, Ryuichiro Mizuno, Tamotsu Nishida
  • Publication number: 20140022880
    Abstract: In an optical pickup device for use in recording and reproducing on an optical recording medium, such as a CD or DVD, banks are formed on both sides of an adhesive agent application position for adhering an optical device, such as a photodetector or a laser diode, in an optical pickup case. At this time, a bank on the side of an optical path is formed higher than a height of an outer bank, and an adhesive agent is poured between the banks, to adhere the optical pickup case and the optical device.
    Type: Application
    Filed: June 18, 2013
    Publication date: January 23, 2014
    Applicant: Hitachi Media Electronics Co., Ltd.
    Inventors: Akiko MIZUSHIMA, Hiroaki FURUICHI, Kazuhiko ITO, Ryuichiro MIZUNO, Tamotsu NISHIDA
  • Publication number: 20130294211
    Abstract: The optical pickup device includes a light-emitting element that emits light, an objective lens that converges light emitted by the light-emitting element on an external optical recording medium, a light-receiving element that receives the light returned from the optical recording medium via the objective lens, a holder that holds the light-emitting element or the light-receiving element, and a casing to which the holder is secured with an adhesive interposed therebetween. The holder has a holder's bonding surface to be bonded to the casing, while the casing has a case's bonding surface facing the holder's bonding surface and to be bonded to the holder. The holder's or casing's bonding surface is provided with adjoining sidewalls that have wall faces forming an angle with the holder's or casing's bonding surface. The holder and casing are adhesively secured to each other with a UV-curable adhesive applied on the holder's or casing's bonding surface.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 7, 2013
    Inventors: Hiroaki FURUICHI, Akiko MIZUSHIMA, Kazuhiko ITO, Ryuichiro MIZUNO, Tamotsu NISHIDA
  • Patent number: 8407730
    Abstract: An objective lens actuator 25, for driving an objective lens 1 for focusing lights upon a recoding surface of an optical disc, comprises a moving part 2, which comprises the objective lens 1 and a coil; a magnet, which is fixed on a yoke and drives the moving part 2; a plural number of elastic support parts, each of which supports the moving part 2 at an end thereof; a first fixing portion 5a and a second fixing portion 5b, which fix other ends of the plural number of elastic support parts 4 and are disposed opposite to each other in a focus direction; and a moving mechanism 6, which is provided on the first and second fixing portion 5a and 5b, so that the first and second fixing portions 5a and 5b can move in the focus direction, relatively, and thereby providing the objective lens actuator 25 enabling to reduce the dynamic relative tilt between the optical disc and the objective lens 1 (i.e.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: March 26, 2013
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Yoshihiro Sato, Hidenao Saito, Seiichi Kato, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
  • Patent number: 8000183
    Abstract: The present invention provides an object lens actuator, an optical pickup, and an optical disk drive, which can increase the size of the object lens actuator driving a lens holder in the tangential tilt direction, and drive and control the lens holder with a small amount of drive current. An object lens actuator comprising a lens holder having an object lens and a first coil; a first magnet fixed to a yoke; plural elastic support parts for supporting said lens holder with a first fulcrum; a moving part for supporting said elastic support parts with a second fulcrum different from said first fulcrum, and a fixed part having a moving mechanism for moving said moving part, wherein said first coil and said first magnet constitute a first magnetic circuit, said first magnetic circuit makes said lens holder movable in a focusing direction, a tracking direction and a radial tilt direction of an optical disk for read/write, and said moving mechanism makes said moving part movable.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: August 16, 2011
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Yoshihiro Satou, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
  • Patent number: 7975275
    Abstract: The present invention has an object to provide an object lens actuator that reduces the amplitude of vibration of an object lens related to a torsional vibration of a lens holder and to enable a disc drive using the same to record information on a disc at high speeds. The above object has been achieved by placing the thickest one of the four walls, which are in an envelope of two opening portions provided in the lens holder and which are perpendicular to a flat plate between the two opening portions, in a position which is opposite to the object lens with respect to the center line between a first support member and a second support member which resiliently support the lens holder therebetween and which is opposite to the object lens with respect to the flat plate.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: July 5, 2011
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Manabu Ochi, Katsuhiko Kimura, Ryuichiro Mizuno
  • Publication number: 20110149713
    Abstract: In an optical pickup equipped with a semiconductor laser, electro-optical components such as a lens, and an objective lens drive device, the objective lens drive device includes objective lenses, a holder holding the objective lenses, a focusing coil, and tracking coils. The focusing coil is wound in parallel to the optical surface of the objective lens, and formed in a parallelogram shape having inclined portions provided near the tracking coils. The two tracking coils are placed on diagonal portions of the lens holder.
    Type: Application
    Filed: December 14, 2010
    Publication date: June 23, 2011
    Inventors: Yoshihiro Sato, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura, Seiichi Kato
  • Publication number: 20100149954
    Abstract: An objective lens actuator 25, for driving an objective lens 1 for focusing lights upon a recoding surface of an optical disc, comprises a moving part 2, which comprises the objective lens 1 and a coil; a magnet, which is fixed on a yoke and drives the moving part 2; a plural number of elastic support parts, each of which supports the moving part 2 at an end thereof; a first fixing portion 5a and a second fixing portion 5b, which fix other ends of the plural number of elastic support parts 4 and are disposed opposite to each other in a focus direction; and a moving mechanism 6, which is provided on the first and second fixing portion 5a and 5b, so that the first and second fixing portions 5a and 5b can move in the focus direction, relatively, and thereby providing the objective lens actuator 25 enabling to reduce the dynamic relative tilt between the optical disc and the objective lens 1 (i.e.
    Type: Application
    Filed: December 8, 2009
    Publication date: June 17, 2010
    Inventors: Yoshihiro SATO, Hidenao Saito, Seiichi Kato, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
  • Patent number: 7697381
    Abstract: An object lens drive unit in which an undesired displacement or inclination of an object lens with respect to an optical disc is reduced. The position at which a lens holder for the object lens is supported by a pair of rod-shaped elastic support members in the focusing direction substantially coincides with the center of the tracking coil in the focusing direction.
    Type: Grant
    Filed: September 27, 2006
    Date of Patent: April 13, 2010
    Assignee: Hitachi Media Electronics Co., Ltd.
    Inventors: Seiichi Katou, Katsuhiko Kimura, Ryuichiro Mizuno, Hidenao Saito, Jun Hato
  • Publication number: 20090103421
    Abstract: The present invention provides an object lens actuator, an optical pickup, and an optical disk drive, which can increase the size of the object lens actuator driving a lens holder in the tangential tilt direction, and drive and control the lens holder with a small amount of drive current. An object lens actuator comprising a lens holder having an object lens and a first coil; a first magnet fixed to a yoke; plural elastic support parts for supporting said lens holder with a first fulcrum; a moving part for supporting said elastic support parts with a second fulcrum different from said first fulcrum, and a fixed part having a moving mechanism for moving said moving part, wherein said first coil and said first magnet constitute a first magnetic circuit, said first magnetic circuit makes said lens holder movable in a focusing direction, a tracking direction and a radial tilt direction of an optical disk for read/write, and said moving mechanism makes said moving part movable.
    Type: Application
    Filed: October 21, 2008
    Publication date: April 23, 2009
    Inventors: Yoshihiro SATOU, Hidenao SAITO, Jun HATO, Ryuichiro MIZUNO, Katsuhiko KIMURA
  • Publication number: 20080172685
    Abstract: The present invention has an object to provide an object lens actuator that reduces the amplitude of vibration of an object lens related to a torsional vibration of a lens holder and to enable a disc drive using the same to record information on a disc at high speeds. The above object has been achieved by placing the thickest one of the four walls, which are in an envelope of two opening portions provided in the lens holder and which are perpendicular to a flat plate between the two opening portions, in a position which is opposite to the object lens with respect to the center line between a first support member and a second support member which resiliently support the lens holder therebetween and which is opposite to the object lens with respect to the flat plate.
    Type: Application
    Filed: January 15, 2008
    Publication date: July 17, 2008
    Inventors: Manabu OCHI, Katsuhiko Kimura, Ryuichiro Mizuno
  • Patent number: 7379397
    Abstract: The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (107, 108), a magnet (109) and opposing surfaces of a yoke (110) are respectively arranged at substantially point symmetrical positions with respect to an optical axis (111) of an objective lens (103) in a state in which no electric current is applied, the yoke (110) and a unit base (117) are connected via a spring member (118), and the unit base (117) is mounted to a casing (120). In this case, the spring member (118) is connected at a position (121) forward apart from the objective lens (103) with respect to the yoke (110), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (103).
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: May 27, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno
  • Publication number: 20070189129
    Abstract: An object lens drive unit in which an undesired displacement or inclination of an object lens with respect to an optical disc is reduced. The position at which a lens holder for the object lens is supported by a pair of rod-shaped elastic support members in the focusing direction substantially coincides with the center of the tracking coil in the focusing direction.
    Type: Application
    Filed: September 27, 2006
    Publication date: August 16, 2007
    Inventors: Seiichi Katou, Katsuhiko Kimura, Ryuichiro Mizuno, Hidenao Saito, Jun Hato
  • Publication number: 20060233069
    Abstract: The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (107, 108), a magnet (109) and opposing surfaces of a yoke (110) are respectively arranged at substantially point symmetrical positions with respect to an optical axis (111) of an objective lens (103) in a state in which no electric current is applied, the yoke (110) and a unit base (117) are connected via a spring member (118), and the unit base (117) is mounted to a casing (120). In this case, the spring member (118) is connected at a position (121) forward apart from the objective lens (103) with respect to the yoke (110), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (103).
    Type: Application
    Filed: June 14, 2006
    Publication date: October 19, 2006
    Applicant: Hitachi, Ltd.
    Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno
  • Patent number: 7076791
    Abstract: The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (107, 108), a magnet (109) and opposing surfaces of a yoke (110) are respectively arranged at substantially point symmetrical positions with respect to an optical axis (111) of an objective lens (103) in a state in which no electric current is applied, the yoke (110) and a unit base (117) are connected via a spring member (118), and the unit base (117) is mounted to a casing (120). In this case, the spring member (118) is connected at a position (121) forward apart from the objective lens (103) with respect to the yoke (110), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (103).
    Type: Grant
    Filed: March 20, 2002
    Date of Patent: July 11, 2006
    Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno