Patents by Inventor Katsumi Kuroguchi
Katsumi Kuroguchi 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: 8307381Abstract: An optical pickup device includes an optical part module having a light emitting device and an optical pickup case to which the optical part module is fixed by way of an adhesive, in which the optical part module is adhesively fixed by disposing a bonding surface of the optical part module to the optical pickup case at least at two positions on lateral surfaces of the optical part module putting an optical axis therebetween, and a bonding distance L in the lateral surface between the optical part module and the optical pickup is defined as: 40 ?m<L<570 ?m, whereby the optical pickup device can maintain an optimal position at a high positional accuracy without lowering a bonding strength even when a stress due to an external load by bending moment or circumstantial changes is caused to the optical part module, particularly in the case where the optical pickup device is thin.Type: GrantFiled: April 17, 2009Date of Patent: November 6, 2012Assignee: Hitachi Media Electronics Co., Ltd.Inventors: Yoshio Oozeki, Rika Nomura, Taketoshi Moriyama, Katsumi Kuroguchi, Kazumi Takahashi
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Publication number: 20100002561Abstract: An optical pickup device includes an optical part module having a light emitting device and an optical pickup case to which the optical part module is fixed by way of an adhesive, in which the optical part module is adhesively fixed by disposing a bonding surface of the optical part module to the optical pickup case at least at two positions on lateral surfaces of the optical part module putting an optical axis therebetween, and a bonding distance L in the lateral surface between the optical part module and the optical pickup is defined as: 40 ?m<L<570 ?m, whereby the optical pickup device can maintain an optimal position at a high positional accuracy without lowering a bonding strength even when a stress due to an external load by bending moment or circumstantial changes is caused to the optical part module, particularly in the case where the optical pickup device is thin.Type: ApplicationFiled: April 17, 2009Publication date: January 7, 2010Inventors: Yoshio OOZEKI, Rika Nomura, Taketoshi Moriyama, Katsumi Kuroguchi, Kazumi Takahashi
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Patent number: 7215886Abstract: The present invention is related to an optical communication module for transmitting high frequency signals (e.g., 10 Gbit/s and higher data rates) between an optical element and an external circuit. In an illustrative embodiment, the optical communication module includes signal transmission lines and ground lines formed on a ceramic substrate, a flexible wiring board, and a printed circuit board. The widths of the signal lines and the ground lines vary, as well as the spacing between the signal and ground lines. This facilitates characteristic impedance matching among the signal lines to within about 50?.Type: GrantFiled: August 15, 2002Date of Patent: May 8, 2007Assignee: Hitachi, Ltd.Inventors: Shigenobu Maruyama, Kazumi Kawamoto, Hiroaki Furuichi, Tooru Yoshida, Isamu Yoshida, Katsuya Oono, Osamu Yamada, Hiroshi Ibe, Shigeru Tokita, Tarou Tonoduka, Yasunori Iwafuji, Katsumi Kuroguchi
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Patent number: 6983000Abstract: A laser diode module includes a laser diode device, a first photo detector part for receiving, first divided light that is a first portion of light when at least one of light emissions of the laser diode device is divided into two portions of light each traveling a different optical path, a second photo detector part for receiving second divided light that is a second portion of light thus divided via at least a wavelength selective member, and a controller which controls the lasing wavelength of the laser diode device on the basis of outputs of the first and second photo detector parts. A beam splitter provided between the laser diode and the wavelength selective member divides light emitted from the laser diode into the first and second divided light and a quarter-wave plate is provided in an optical path between the beam splitter and the wavelength selective member.Type: GrantFiled: July 15, 2003Date of Patent: January 3, 2006Assignee: Hitachi, Ltd.Inventors: Kimio Tatsuno, Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi
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Patent number: 6937628Abstract: A subject of the invention is to reduce the temperature dependence of an etalon as a wavelength locker for a semiconductor laser device and so forth. Concretely, it is to restrict the lowering of the wavelength locking performance of the etalon dependent on the temperature variation. A means to solve the subject is the use of an air gap etalon. Concretely, the means is provided with a media plate and parallel plane plates on both sides of the media plate. The two parallel plane plates and the space between them constitute the air gap etalon.Type: GrantFiled: March 5, 2002Date of Patent: August 30, 2005Assignee: Opnext Japan, Inc.Inventors: Kimio Tatsuno, Katsumi Kuroguchi, Atsuhiro Yamamoto, Teruhisa Azumaguchi, Hiroaki Furuichi
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Patent number: 6912363Abstract: An optical module for use in detecting a plurality of different wavelengths by making use of the multiple wavelength selectivity of an etalon. The optical module includes a semiconductor laser, a lens for converting a beam emitted from the semiconductor laser into a substantially parallel beam, a beam splitter for splitting the converted beam into a reflected beam and a transmitted beam, and a light-receiving element disposed such that one of the split beams is incident thereupon through an etalon, wherein a center of the reflected beam from the etalon occurring as the beam is incident upon the etalon is arranged to return to a region other than a beam-emitting portion of the semiconductor laser.Type: GrantFiled: July 31, 2001Date of Patent: June 28, 2005Assignee: OpNext Japan, Inc.Inventors: Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi, Atsuhiro Yamamoto, Keiichi Yamada, Tsutomu Okumura, Kazuo Takai, Shohei Hata
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Patent number: 6826211Abstract: Conventionally, in the wavelength locking optical system, the wavelength as detected is deviated from a targeted range owing to the change of the peripheral temperature resulting from the temperature characteristics of the wavelength error detection device. To solve this prior issue, it is arranged such that a portion of the wavelength error detection device, through which portion light-beams passes, contacts a material of high heat conductivity.Type: GrantFiled: September 20, 2001Date of Patent: November 30, 2004Assignees: Hitachi, Ltd., Opnext Japan, Inc.Inventors: Kimio Tatsuno, Katsumi Kuroguchi, Hiroaki Furuichi, Atsuhiro Yamamoto, Norio Nakazato
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Publication number: 20040228373Abstract: A laser diode module includes a laser diode device, a first photo detector part for receiving, first divided light that is a first portion of light when at least one of light emissions of the laser diode device is divided into two portions of light each traveling a different optical path, a second photo detector part for receiving second divided light that is a second portion of light thus divided via at least a wavelength selective member, and a controller which controls the lasing wavelength of the laser diode device on the basis of outputs of the first and second photo detector parts. A beam splitter provided between the laser diode and the wavelength selective member divides light emitted from the laser diode into the first and second divided light and a quarter-wave plate is provided in an optical path between the beam splitter and the wavelength selective member.Type: ApplicationFiled: July 15, 2003Publication date: November 18, 2004Inventors: Kimio Tatsuno, Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi
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Publication number: 20040208211Abstract: A ceramic substrate is provided through a stem of a can-package, the desired number of wirings including the high speed signal wirings are formed on this ceramic substrate and the necessary electronic components other than a light-emitting/photosensitive element such as driver LSI and amplifying LSI or the like are also accommodated within the can-package.Type: ApplicationFiled: August 15, 2002Publication date: October 21, 2004Applicant: OpNext Japan, Inc.Inventors: Shigenobu Maruyama, Kazumi Kawamoto, Hiroaki Furuichi, Tooru Yoshida, Isamu Yoshida, Katsuya Oono, Osamu Yamada, Hiroshi Ibe, Shigeru Tokita, Tarou Tonoduka, Yasunori Iwafuji, Katsumi Kuroguchi
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Patent number: 6805496Abstract: The incident angle of the beam with regard to an etalon is arranged finely tunable by either rotating the etalon provided with a plane of incidence inclined with regard to the rotational axis thereof in the vicinity of the optical axis or rotating a lens whose edge surface is obliquely ground around the optical axis, which allows the incident angle of the laser beam with regard to the etalon to be adjusted and fixed with high precision.Type: GrantFiled: January 17, 2002Date of Patent: October 19, 2004Assignee: OpNext Japan, Inc.Inventors: Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi, Keiichi Yamada, Shintarou Sakamoto
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Patent number: 6597712Abstract: In a wavelength locking optical system, a resonator is formed between a wavelength deviation detection device and a facet of the laser diode, which makes a control signal unstable. A solution to this problem is to arrange polarization controlling elements between a wavelength deviation detection filter and a laser diode to stabilize the deviation signal, and to perform wavelength-locking with the stabilizer signal.Type: GrantFiled: August 23, 2001Date of Patent: July 22, 2003Assignee: Hitachi, Ltd.Inventors: Kimio Tatsuno, Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi
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Publication number: 20030076564Abstract: An optical module for use in detecting a plurality of different wavelengths by making use of the multiple wavelength selectivity of an etalon. The optical module includes a semiconductor laser, a lens for converting a beam emitted from the semiconductor laser into a substantially parallel beam, a beam splitter for splitting the converted beam into a reflected beam and a transmitted beam, and a light-receiving element disposed such that one of the split beams is incident thereupon through an etalon, wherein a center of the reflected beam from the etalon occurring as the beam is incident upon the etalon is arranged to return to a region other than a beam-emitting portion of the semiconductor laser.Type: ApplicationFiled: July 31, 2001Publication date: April 24, 2003Inventors: Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi, Atsuhiro Yamamoto, Keiichi Yamada, Tsutomu Okumura, Kazuo Takai, Shohei Hata
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Publication number: 20030072542Abstract: The incident angle of the beam with regard to an etalon is arranged finely tunable by either rotating the etalon provided with a plane of incidence inclined with regard to the rotational axis thereof in the vicinity of the optical axis or rotating a lens whose edge surface is obliquely ground around the optical axis, which allows the incident angle of the laser beam with regard to the etalon to be adjusted and fixed with high precision.Type: ApplicationFiled: January 17, 2002Publication date: April 17, 2003Applicant: OpNext Japan, Inc.Inventors: Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi, Keiichi Yamada, Shintarou Sakamoto
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Publication number: 20030067948Abstract: A subject of the invention is to reduce the temperature dependence of an etalon as a wavelength locker for a semiconductor laser device and so forth. Concretely, it is to restrict the lowering of the wavelength locking performance of the etalon dependent on the temperature variation. A means to solve the subject is the use of an air gap etalon. Concretely, the means is provided with a media plate and parallel plane plates on both sides of the media plate. The two parallel plane plates and the space between them constitute the air gap etalon.Type: ApplicationFiled: March 5, 2002Publication date: April 10, 2003Inventors: Kimio Tatsuno, Katsumi Kuroguchi, Atsuhiro Yamamoto, Teruhisa Azumaguchi, Hiroaki Furuichi
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Publication number: 20030039276Abstract: The problem of the disclosed technology is that, in a wavelength locking optical system, a resonator is formed between a wavelength deviation detection device and a facet of a laser diode, which makes a control signal unstable.Type: ApplicationFiled: August 23, 2001Publication date: February 27, 2003Inventors: Kimio Tatsuno, Hiroaki Furuichi, Kazumi Kawamoto, Katsumi Kuroguchi
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Publication number: 20030002050Abstract: Conventionally, in the wavelength locking optical system, the wavelength as detected is deviated from a targeted range owing to the change of the peripheral temperature resulting from the temperature characteristics of the wavelength error detection device. To solve this prior issue, it is arranged such that a portion of the wavelength error detection device, through which portion light-beams passes, contacts a material of high heat conductivity.Type: ApplicationFiled: September 20, 2001Publication date: January 2, 2003Inventors: Kimio Tatsuno, Katsumi Kuroguchi, Hiroaki Furuichi, Atsuhiro Yamamoto, Norio Nakazato
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Patent number: 6332720Abstract: When an optical system is housed in a plastic case, an optical connection in the system might be changed by a deformation of the case due to heat and thermal resistance might be increased. It is important that the case has not only a function of housing the elements of the optical system, but also a function of ensuring that light is stably produced in the optical system, which, is the most important function of the case. Therefore, the deformation of the case due to a change in temperature is prevented by a frame inserted into the opening portion of the case and further by mounting the case on an external aluminum substrate. That is, stability in the optical connection is improved by improving the structure of the case and by mounting an case on the external substrate. Further, an increase in the thermal resistance is prevented in the same way by provision of the frame and the external aluminum substrate.Type: GrantFiled: September 16, 1999Date of Patent: December 25, 2001Assignee: Hitachi, Ltd.Inventors: Makoto Shimaoka, Tadaaki Ishikawa, Kazuyuki Fukuda, Katsumi Kuroguchi