Patents by Inventor Akira Mugino
Akira Mugino 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: 6812055Abstract: Microelectromechanical (MEMS) devices that use MEMS electromagnetic actuators to selectively generate displacement forces are disclosed herein. According to one exemplary embodiment disclosed herein, a MEMS device may include a substrate having a surface, an actuable element at least partially formed from the substrate, and an electromagnetic actuator disposed on the substrate for selectively applying a first force to the actuable element to displace the actuable element along a path. The actuable element may have a base and an arm coupled to the base. The base may include a portion comprised of a magnetic material. The electromagnetic actuator may comprise an electrically conductive coil, and the path of the actuable element may pass through a coil gap in the coil. The electromagnetic actuator may also comprise a magnetic core about which the electrically conductive coil may be wound.Type: GrantFiled: December 18, 2003Date of Patent: November 2, 2004Assignees: Advanced Microsensors, Furukawa America, Inc.Inventors: Hirokazu Tamura, Matthew J. Neal, Akira Mugino, Alan L. Sidman
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Publication number: 20040129953Abstract: Microelectromechanical (MEMS) devices that use MEMS electromagnetic actuators to selectively generate displacement forces are disclosed herein. According to one exemplary embodiment disclosed herein, a MEMS device may include a substrate having a surface, an actuable element at least partially formed from the substrate, and an electromagnetic actuator disposed on the substrate for selectively applying a first force to the actuable element to displace the actuable element along a path. The actuable element may have a base and an arm coupled to the base. The base may include a portion comprised of a magnetic material. The electromagnetic actuator may comprise an electrically conductive coil, and the path of the actuable element may pass through a coil gap in the coil. The electromagnetic actuator may also comprise a magnetic core about which the electrically conductive coil may be wound.Type: ApplicationFiled: December 18, 2003Publication date: July 8, 2004Inventors: Hirokazu Tamura, Matthew J. Neal, Akira Mugino, Alan L. Sidman
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Patent number: 6717227Abstract: Microelectromechanical (MEMS) devices that use MEMS electromagnetic actuators to selectively generate displacement forces are disclosed herein. According to one exemplary embodiment disclosed herein, a MEMS device may include a substrate having a surface, an actuable element at least partially formed from the substrate, and an electromagnetic actuator disposed on the substrate for selectively applying a first force to the actuable element to displace the actuable element along a path. The actuable element may have a base and an arm coupled to the base. The base may include a portion comprised of a magnetic material. The electromagnetic actuator may comprise an electrically conductive coil, and the path of the actuable element may pass through a coil gap in the coil. The electromagnetic actuator may also comprise a magnetic core about which the electrically conductive coil may be wound.Type: GrantFiled: February 21, 2002Date of Patent: April 6, 2004Assignees: Advanced Microsensors, Furukawa America, Inc.Inventors: Hirokazu Tamura, Matthew J. Neal, Akira Mugino, Alan L. Sidman
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Publication number: 20030156451Abstract: Microelectromechanical (MEMS) devices that use MEMS electromagnetic actuators to selectively generate displacement forces are disclosed herein. According to one exemplary embodiment disclosed herein, a MEMS device may include a substrate having a surface, an actuable element at least partially formed from the substrate, and an electromagnetic actuator disposed on the substrate for selectively applying a first force to the actuable element to displace the actuable element along a path. The actuable element may have a base and an arm coupled to the base. The base may include a portion comprised of a magnetic material. The electromagnetic actuator may comprise an electrically conductive coil, and the path of the actuable element may pass through a coil gap in the coil. The electromagnetic actuator may also comprise a magnetic core about which the electrically conductive coil may be wound.Type: ApplicationFiled: February 21, 2002Publication date: August 21, 2003Applicant: Fitel Technologies, Inc.Inventors: Hirokazu Tamura, Matthew J. Neal, Akira Mugino, Alan L. Sidman
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Patent number: 6529535Abstract: There is provided a semiconductor laser device capable of increasing the optical output. The semiconductor laser module comprises a semiconductor laser device (1), an optical fiber (2) that receives light emitted from the semiconductor laser device (1) and a photo diode (3) that monitors optical output of the semiconductor laser device (1). The optical fiber (2) is a lensed fiber having a wedge-shaped lens on its tip and the photo diode (3) placed in the vicinity of the laser light receiving end (2a) of the semiconductor laser device (1) receives reflected light from a reflection surface (2a1) and monitors the optical output of the semiconductor laser device (1).Type: GrantFiled: January 31, 2001Date of Patent: March 4, 2003Assignee: The Furukawa Electric Co., Ltd.Inventors: Etsuji Katayama, Yuichiro Irie, Jun Miyokawa, Akira Mugino
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Publication number: 20030039025Abstract: A semiconductor laser module contains a wavelength selective feedback mechanism that has a center wavelength positioned a predetermined wavelength separation away from a peak gain curve of multiple output modes of light produced by a semiconductor laser contained in the module. In particular, the amount of separation between the center wavelength of the wavelength selective feedback mechanism is set such that modes occurring a predetermined wavelength separation on either side of the center wavelength, are on a same side of a gain curve of the semiconductor laser, with regard to a wavelength in which peak gain is observed. With lasers that have ripples in a characteristic gain curve thereof, the bandwidth of the wavelength selective feedback mechanism is set so that the local peaks of the gain curve decrease (or increase) monotonically therethrough. When the ripples are absent in the gain curve, the slope of the gain curve remains monotonic throughout the reflectance bandwidth.Type: ApplicationFiled: August 27, 2001Publication date: February 27, 2003Applicant: THE FURUKAWA ELECTRIC CO. LTD.Inventors: Akira Mugino, Takeshi Aikiyo, Takeo Shimizu, Naoki Hayamizu
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Publication number: 20020122454Abstract: A laser module in which a fiber grating fixed in a ferrule is used as a distributed reflector to stabilize the oscillation characteristic of a laser by maintaining the original reflection characteristics of the fiber grating. Only one or more portions of a fiber grating that do not include a grating, namely, a non-grating forming portion(s), are fixed to a ferrule by solder. The portion of the fiber that includes the grating, i.e., the grating forming portion, is not subject to metal deposition. Thus the deformation and/or degradation of a grating due to heat from the solder is decreased or completely avoided.Type: ApplicationFiled: March 5, 2001Publication date: September 5, 2002Applicant: The Furukawa Electric Co., Ltd.Inventors: Hideyuki Nasu, Yuji Kato, Akira Mugino, Hideyuki Ohmura
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Patent number: 6343088Abstract: A semiconductor laser module 1 comprising a semiconductor laser device 2 having an emitting surface 2a from which excited light is emitted and a reflecting surface 2b opposite to the emitting surface, and an optical feedback medium 3 for feeding most of optical power emitted from the emitting surface 2a of the semiconductor laser device 2 back to the semiconductor laser device 2 by coupling means 4 and emitting part of the optical power. The semiconductor laser device 2 has a low reflectance multilayer coating 2c formed on the emitting surface 2a and having a reflectance of 10−4 to 10%. The low reflectance multilayer coating 2c has a reflection spectrum in the form of a curve having a maximum value at the central wavelength of reflection and minimum values on both sides of the central wavelength of reflection.Type: GrantFiled: September 15, 1999Date of Patent: January 29, 2002Assignee: The Furukawa Electric Co., Ltd.Inventors: Akira Mugino, Satoshi Koyanagi, Takeo Shimizu
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Publication number: 20020003818Abstract: There is provided a semiconductor laser device capable of increasing the optical output. The semiconductor laser module comprises a semiconductor laser device (1), an optical fiber (2) that receives light emitted from the semiconductor laser device (1) and a photo diode (3) that monitors optical output of the semiconductor laser device (1). The optical fiber (2) is a lensed fiber having a wedge-shaped lens on its tip and the photo diode (3) placed in the vicinity of the laser light receiving end (2a) of the semiconductor laser device (1) receives reflected light from a reflection surface (2a1) and monitors the optical output of the semiconductor laser device (1).Type: ApplicationFiled: January 31, 2001Publication date: January 10, 2002Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Etsuji Katayama, Yuichiro Irie, Jun Miyokawa, Akira Mugino
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Patent number: 6335944Abstract: A semiconductor laser module of an external-cavity type in which a GaAs/AlGaAs-based semiconductor laser having ripples in the gain-wavelength characteristic thereof and an optical transmission medium including a Bragg grating are optically coupled by an optical coupling member.Type: GrantFiled: September 27, 2000Date of Patent: January 1, 2002Assignee: The Furukawa Elctric Co., LTDInventors: Akira Mugino, Takeo Shimizu
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Patent number: 5764825Abstract: The present invention proposes an optical wavelength division multiplexer device which has low through loss and low reflection loss, and also has high isolation. A filter member is made up from a filter base board upon which is formed a wavelength division filter 5, and is disposed so as to intersect an input and output optical waveguide 3 of rectilinear form part-way along it at an intersection angle .alpha.. When light which includes light of two different wavelengths .lambda..sub.1 and .lambda..sub.2 is incident through an incident light side of the input and output optical waveguide 3, the light of wavelength .lambda..sub.2 passes through the wavelength division filter 5 and is emitted through an emitted light side, while the light of wavelength .lambda..sub.1 is reflected by the wavelength division filter 5 in a direction separated from the input and output optical waveguide 3.Type: GrantFiled: May 8, 1996Date of Patent: June 9, 1998Assignee: The Furukawa Electric Co. Ltd.Inventors: Akira Mugino, Shuichi Tamura, Takeo Shimizu
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Patent number: 5321782Abstract: A directional coupler type optical function element with a high extinction ratio, in which a junction of a 2-input/2-output directional coupler or 1-input/2-output directional coupler, formed of a semiconductor or dielectric, is formed by successively optically connecting, from the input side to the output side, a front-stage partial junction, front-stage partial junction with electrode, central partial junction, rear-stage partial junction with electrode, and rear-stage partial junction, each having a predetermined length. The connection state at the front-stage partial junction and an incidence-side lead section optically connected thereto and the connection state at the rear-stage partial junction and an emergence-side lead section optically connected thereto cancel each other, thereby equivalently providing a symmetrical connection state and preventing the extinction ratio for a cross mode from lowering.Type: GrantFiled: June 22, 1993Date of Patent: June 14, 1994Assignee: Furukawa Electric Co., Ltd.Inventors: Akira Mugino, Hisaharu Yanagawa