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).
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Publication number: 20210364802Abstract: 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: ApplicationFiled: April 19, 2021Publication date: November 25, 2021Inventors: Masahito UCHIYAMA, Toshiteru NAKAMURA, Takuma KUNO, Ryuichiro MIZUNO, Kazuhiko KUZUMAKI
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Publication number: 20180266752Abstract: 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: ApplicationFiled: October 11, 2017Publication date: September 20, 2018Inventors: Ryuichiro Mizuno, Akiyuki Kuriyama, Tomoaki Eguchi
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Publication number: 20180224199Abstract: 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: ApplicationFiled: October 11, 2017Publication date: August 9, 2018Inventors: Ryuichiro Mizuno, Akiyuki Kuriyama, Tomoaki Eguchi
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Publication number: 20150117172Abstract: 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: ApplicationFiled: October 30, 2014Publication date: April 30, 2015Inventors: Tatsuya YAMASAKI, Katsuhiko KIMURA, Ryuichiro MIZUNO
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Patent number: 8743668Abstract: 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: GrantFiled: December 14, 2010Date of Patent: June 3, 2014Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Yoshihiro Sato, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura, Seiichi Kato
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Patent number: 8711666Abstract: 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: GrantFiled: June 18, 2013Date of Patent: April 29, 2014Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Akiko Mizushima, Hiroaki Furuichi, Kazuhiko Ito, Ryuichiro Mizuno, Tamotsu Nishida
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Publication number: 20140022880Abstract: 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: ApplicationFiled: June 18, 2013Publication date: January 23, 2014Applicant: Hitachi Media Electronics Co., Ltd.Inventors: Akiko MIZUSHIMA, Hiroaki FURUICHI, Kazuhiko ITO, Ryuichiro MIZUNO, Tamotsu NISHIDA
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Publication number: 20130294211Abstract: 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: ApplicationFiled: May 6, 2013Publication date: November 7, 2013Inventors: Hiroaki FURUICHI, Akiko MIZUSHIMA, Kazuhiko ITO, Ryuichiro MIZUNO, Tamotsu NISHIDA
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Patent number: 8407730Abstract: 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: GrantFiled: December 8, 2009Date of Patent: March 26, 2013Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Yoshihiro Sato, Hidenao Saito, Seiichi Kato, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
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Patent number: 8000183Abstract: 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: GrantFiled: October 21, 2008Date of Patent: August 16, 2011Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Yoshihiro Satou, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
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Patent number: 7975275Abstract: 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: GrantFiled: January 15, 2008Date of Patent: July 5, 2011Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Manabu Ochi, Katsuhiko Kimura, Ryuichiro Mizuno
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Publication number: 20110149713Abstract: 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: ApplicationFiled: December 14, 2010Publication date: June 23, 2011Inventors: Yoshihiro Sato, Hidenao Saito, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura, Seiichi Kato
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Publication number: 20100149954Abstract: 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: ApplicationFiled: December 8, 2009Publication date: June 17, 2010Inventors: Yoshihiro SATO, Hidenao Saito, Seiichi Kato, Jun Hato, Ryuichiro Mizuno, Katsuhiko Kimura
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Patent number: 7697381Abstract: 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: GrantFiled: September 27, 2006Date of Patent: April 13, 2010Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Seiichi Katou, Katsuhiko Kimura, Ryuichiro Mizuno, Hidenao Saito, Jun Hato
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Publication number: 20090103421Abstract: 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: ApplicationFiled: October 21, 2008Publication date: April 23, 2009Inventors: Yoshihiro SATOU, Hidenao SAITO, Jun HATO, Ryuichiro MIZUNO, Katsuhiko KIMURA
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Publication number: 20080172685Abstract: 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: ApplicationFiled: January 15, 2008Publication date: July 17, 2008Inventors: Manabu OCHI, Katsuhiko Kimura, Ryuichiro Mizuno
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Patent number: 7379397Abstract: 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: GrantFiled: June 14, 2006Date of Patent: May 27, 2008Assignee: Hitachi, Ltd.Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno
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Publication number: 20070189129Abstract: 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: ApplicationFiled: September 27, 2006Publication date: August 16, 2007Inventors: Seiichi Katou, Katsuhiko Kimura, Ryuichiro Mizuno, Hidenao Saito, Jun Hato
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Publication number: 20060233069Abstract: 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: ApplicationFiled: June 14, 2006Publication date: October 19, 2006Applicant: Hitachi, Ltd.Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno
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Patent number: 7076791Abstract: 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: GrantFiled: March 20, 2002Date of Patent: July 11, 2006Inventors: Hiromitsu Mori, Kyuichiro Nagai, Atsushi Inoue, Toshimasa Kamisada, Ryuichiro Mizuno