Patents by Inventor Takashi Takahashi

Takashi Takahashi 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).

  • Patent number: 6959025
    Abstract: A surface-emitting laser diode device that oscillates in a direction perpendicular to the substrate is provided. This surface-emitting laser diode device includes: an active layer; a resonator structure including a first distributed Bragg reflector and a second distributed Bragg reflector that face each other and sandwich the active layer; a hole passage that extends from a first electrode to the active layer; an electron passage that extends from a second electrode to the active layer; a hole restricting structure that is located in the hole passage and defines a region for confining holes to the active layer; and an optical mode control structure that includes a non-oxide region provided in the resonator structure and an oxide region surrounding the non-oxide region, each region containing Al as a constituent element. In this surface-emitting laser diode, the area of the non-oxide region is smaller than the area of the hole restricting structure.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: October 25, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoto Jikutani, Shunichi Sato, Takashi Takahashi
  • Publication number: 20050230674
    Abstract: A semiconductor light emitter includes a quantum well active layer which includes nitrogen and at least one other Group-V element, and barrier layers which are provided alongside the quantum well active layer, wherein the quantum well active layer and the barrier layers together constitute an active layer, wherein the barrier layers are formed of a Group-III-V mixed-crystal semiconductor that includes nitrogen and at least one other Group-V element, a nitrogen composition thereof being smaller than that of the quantum well active layer.
    Type: Application
    Filed: June 20, 2005
    Publication date: October 20, 2005
    Inventors: Takashi Takahashi, Shunichi Sato, Morimasa Kaminishi
  • Publication number: 20050213210
    Abstract: A phase difference plate is formed by bonding a fixed substrate which has a transmission function or a reflection function to at least one of surfaces of an organic thin film through an adhesive. The phase difference plate has a relation of E1?E2>E3 wherein E1 is a linear expansion coefficient of the organic thin film, E2 is a linear expansion coefficient of the adhesive, and a linear expansion coefficient E3 of the fixed substrate. When the laser wavelength is fluctuated by temperature change, phase difference is changed so as to match to the fluctuation of wavelength. An optical head device has the phase difference plate in such a way that an arrangement position of the phase difference plate is changeable.
    Type: Application
    Filed: March 14, 2005
    Publication date: September 29, 2005
    Inventors: Takashi Takahashi, Nobuki Tanaka, Takaaki Saito
  • Patent number: 6927412
    Abstract: A semiconductor light emitter includes a quantum well active layer which includes nitrogen and at least one other Group-V element, and barrier layers which are provided alongside the quantum well active layer, wherein the quantum well active layer and the barrier layers together constitute an active layer, wherein the barrier layers are formed of a Group-III-V mixed-crystal semiconductor that includes nitrogen and at least one other Group-V element, a nitrogen composition thereof being smaller than that of the quantum well active layer.
    Type: Grant
    Filed: November 20, 2003
    Date of Patent: August 9, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Takahashi, Shunichi Sato, Morimasa Kaminishi
  • Publication number: 20050170386
    Abstract: The present invention provides a method of confirming the gene expression, useful in the decision of a five year survival rate of a patient with lung cancer and the use of a DNA probe kit in the method. A method useful in the decision of a survival rate of a patient with non-small cell lung cancer comprising confirming the expression strength of at least one gene selected from the group consisting of in lung cancer tissues isolated from the patient.
    Type: Application
    Filed: December 10, 2004
    Publication date: August 4, 2005
    Inventors: Takashi Takahashi, Shuta Tomita, Tetsuya Mitsudomi, Yasushi Yatabe, Nobuhiko Ogura, Masato Some
  • Publication number: 20050100068
    Abstract: A surface-emitting laser diode device that oscillates in a direction perpendicular to the substrate is provided. This surface-emitting laser diode device includes: an active layer; a resonator structure including a first distributed Bragg reflector and a second distributed Bragg reflector that face each other and sandwich the active layer; a hole passage that extends from a first electrode to the active layer; an electron passage that extends from a second electrode to the active layer; a hole restricting structure that is located in the hole passage and defines a region for confining holes to the active layer; and an optical mode control structure that includes a non-oxide region provided in the resonator structure and an oxide region surrounding the non-oxide region, each region containing Al as a constituent element. In this surface-emitting laser diode, the area of the non-oxide region is smaller than the area of the hole restricting structure.
    Type: Application
    Filed: February 20, 2003
    Publication date: May 12, 2005
    Inventors: Naoto Jikutani, Shunichi Sato, Takashi Takahashi
  • Patent number: 6890682
    Abstract: A battery holding structure for an electronic timepiece has a battery frame having an opening for receiving a battery. The battery frame has a plurality of fittings each having a tapered overhang extending toward the opening for holding the battery in the opening.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: May 10, 2005
    Assignee: Seiko Instruments Inc.
    Inventors: Takashi Takahashi, Takayuki Satodate, Yuichi Shino
  • Patent number: 6884291
    Abstract: An optical semiconductor device operable in a 0.6 ?m band includes an active layer of GaInNP sandwiched by a pair of GaInP layers each having a thickness of about 2 molecular layers or less.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: April 26, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Naoto Jikutani, Shunichi Sato, Takashi Takahashi
  • Publication number: 20050079285
    Abstract: An optical member (for example, optical fiber) is dipped in a coating solution having a film forming material dissolved therein to form an antireflection film on the end surface of the optical member. When the optical member is pulled up from the coating solution, the angle formed by the level of the coating solution and the end surface of the optical member, or the pulling speed is varied to adjust the film thickness or reflectance of the antireflection film to be formed on the end surface of the optical member. The film forming material is a fluorine-containing compound. The antireflection film is formed by dipping. The film thickness of the antireflection film is uneven.
    Type: Application
    Filed: July 21, 2003
    Publication date: April 14, 2005
    Inventors: Takashi Takahashi, Masakazu Komine, Kazumi Kokubo, You Umeda
  • Publication number: 20050040413
    Abstract: A semiconductor light-emitting device has a semiconductor layer containing Al between a substrate and an active layer containing nitrogen, wherein Al and oxygen are removed from a growth chamber before growing said active layer and a concentration of oxygen incorporated into said active layer together with Al is set to a level such that said semiconductor light-emitting device can perform a continuous laser oscillation at room temperature.
    Type: Application
    Filed: February 27, 2004
    Publication date: February 24, 2005
    Inventors: Takashi Takahashi, Morimasa Kaminishi, Shunichi Sato, Akihiro Itoh, Naoto Jikutani
  • Patent number: 6857267
    Abstract: The Stirling cycle engine includes: a casing having a cylindrical shape; a cylinder for sidably inserting a displacer and a piston into a part adjacent to one end and another part adjacent to an other end thereof respectively,_the cylinder being coaxially placed inside the casing; a driving mechanism provided around an outer peripheral surface of the cylinder so as to force the piston to reciprocate inside the cylinder; a mount for fixing the driving mechanism to the outer peripheral surface of the cylinder, the mount being integrally formed with the cylinder; a flat spring having a center portion thereof connected to the piston; and a plurality of connecting arms, one ends thereof being integrally formed with the mount and the other ends thereof being connected to a peripheral portion of the flat spring.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: February 22, 2005
    Assignee: Twinbird Corporation
    Inventors: Tsuneo Yamagiri, Takashi Takahashi, Hideto Urasawa
  • Publication number: 20050036450
    Abstract: The network monitoring system includes: a monitoring equipment 10; and a reproduction terminal 20 which decompresses compressed image data included in monitoring information transmitted by the monitoring equipment through a network line 40; a calculation unit for calculating the transmittable amount of information 501 which calculates the transmittable amount of information per unit time of the network line; and a calculation unit for calculating the transmitted amount of information 502 which calculates the transmitted amount of information per unit time of the monitoring information to be transmitted on the basis of a predetermined occupation ratio in order to determine a ratio of the monitoring information to the calculated transmittable amount of information, and the amount of information per unit time of monitoring information to be transmitted from the monitoring equipment is controlled on the basis of the transmitted amount of information per unit time that has been calculated by the calculation unit f
    Type: Application
    Filed: June 16, 2004
    Publication date: February 17, 2005
    Inventors: Kozue Arimori, Takashi Takahashi, Toshio Hoshi
  • Patent number: 6856631
    Abstract: A self-pulsating semiconductor laser device includes a semiconductor substrate of the first conductivity type, a first cladding layer of the first conductivity type formed on the substrate and an active layer formed on the first cladding layer. A second cladding layer of a second conductivity type is formed on the active layer. A saturable absorbing layer is formed on at least portions of at least one of the first cladding layer and the second cladding layer. The saturable absorbing layer has a band gap energy either approximately the same as, or slightly smaller than, the active layer.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: February 15, 2005
    Assignee: Ricoh Company, Ltd.
    Inventor: Takashi Takahashi
  • Publication number: 20040257522
    Abstract: A lower holding table and an upper holding table, which hold substrates, respectively, are moved relative to each other, causing one of the substrates to contact the drops of liquid crystal, formed on the other substrate. The substrate that is held on the lower holding table is thereby made to float. Next, the floating substrate is made to abut on the lower holding table. A contact load smaller than the bonding load to be applied to bond the substrates together is thereby applied to the two substrates, thus aligning the substrates with each other in the horizontal direction. The bonding load is applied to the two substrates thus aligned. The substrates are thereby bonded with a seal layer.
    Type: Application
    Filed: July 14, 2004
    Publication date: December 23, 2004
    Applicant: Shibura Mechatronics Corporation
    Inventors: Hirokazu Masuda, Takashi Takahashi
  • Patent number: 6829271
    Abstract: A light-emitting semiconductor device for producing red color optical radiation has a cladding layer of AlGaInPAs having a lattice constant between GaAs and GaP. Further, the laser diode uses an optical waveguide layer in the system of GaInPAs free from Al. The semiconductor device may be constructed on a GaPAs substrate.
    Type: Grant
    Filed: February 3, 2003
    Date of Patent: December 7, 2004
    Assignee: Ricoh Company, Ltd.
    Inventors: Shunichi Sato, Takashi Takahashi, Naoto Jikutani
  • Publication number: 20040238832
    Abstract: A semiconductor light-emitting device has a semiconductor layer containing Al between a substrate and an active layer containing nitrogen, wherein Al and oxygen are removed from a growth chamber before growing said active layer and a concentration of oxygen incorporated into said active layer together with Al is set to a level such that said semiconductor light-emitting device can perform a continuous laser oscillation at room temperature.
    Type: Application
    Filed: June 29, 2004
    Publication date: December 2, 2004
    Inventors: Takashi Takahashi, Morimasa Kaminishi, Shunichi Sato, Akihiro Itoh, Naoto Jikutani
  • Publication number: 20040228381
    Abstract: A laser diode includes a substrate having a lattice constant of GaAs or between GaAs and GaP, a first cladding layer of AlGaInP formed on the substrate, an active layer of GaInAsP formed on the first cladding layer, an etching stopper layer of GaInP formed on the active layer, a pair of current-blocking regions of AlGaInP formed on the etching stopper layer so as to define a strip region therebetween, an optical waveguide layer of AlGaInP formed on the pair of current-blocking regions so as to cover the etching stopper layer in the stripe region, and a second cladding layer of AlGaInP formed on the optical waveguide layer, wherein the current-blocking regions having an Al content substantially identical with an Al content of the second cladding layer.
    Type: Application
    Filed: June 15, 2004
    Publication date: November 18, 2004
    Inventors: Naoto Jikutani, Takashi Takahashi, Shunichi Sato
  • Patent number: 6814483
    Abstract: To provide a self-winding timepiece having a thin and small-sized movement in which a train wheel setting apparatus for setting a balance with hairspring is efficiently arranged at the movement. A self-winding timepiece includes a main plate, a time indicating wheel, a winding stem and a switching apparatus. A movement barrel complete is arranged on a top side of the main plate and arranged to overlap a main plate reference horizontal axis line between a first region and a fourth region. A balance with hairspring is arranged on the top side of the main plate and arranged to overlap the main plate reference horizontal axis line between a second region and a third region. The switching apparatus is arranged on a back side of the main plate. A train wheel setting apparatus includes a train wheel setting portion for setting the balance with hairspring by penetrating the main plate.
    Type: Grant
    Filed: November 18, 2003
    Date of Patent: November 9, 2004
    Assignee: Seiko Instruments Inc.
    Inventors: Mamoru Watanabe, Shigeo Suzuki, Takashi Takahashi, Takeshi Tokoro, Katsuyoshi Takizawa
  • Publication number: 20040218473
    Abstract: To realize a chronograph timepiece capable of firmly and simultaneously zeroing an hour heart cam, a second heart cam and a minute heart cam. A chronograph timepiece of the invention includes a hammer operated by operating a reset button for controlling to operate to zero an hour chronograph wheel & pinion, a minute chronograph wheel & pinion and a second chronograph wheel & pinion. When the hammer is brought into contact with an hour heart cam, a second heart cam and a minute heart cam, a position of the hammer is determined only by the hour heart cam, the second heart cam and the minute heart cam. When the hammer is brought into contact with the hour heart cam, the second heart cam and the minute heart cam, a direction of a press force exerted to the hammer is constituted to pass a rotational center of the second chronograph wheel.
    Type: Application
    Filed: March 25, 2004
    Publication date: November 4, 2004
    Inventors: Takashi Takahashi, Mamoru Watanabe, Katsuyoshi Takizawa, Shigeo Suzuki, Takeshi Tokoro
  • Publication number: 20040208085
    Abstract: To realize a chronograph timepiece in which a chronograph mechanism and a calendar mechanism are constituted not to overlap and a thickness of a movement is thin. A chronograph timepiece of the invention includes a base unit including a main plate, a surface train wheel and an escapement/speed control apparatus and including at least one of an automatic winding apparatus and a hand winding apparatus and a chronograph unit including a second indicating mechanism, a second chronograph train wheel, a minute chronograph train wheel, an hour chronograph train wheel and a date feeding mechanism. The chronograph unit is arranged on a side of the base unit having a dial. A calendar mechanism includes a date indicator and a date feeding mechanism. The date feeding mechanism is arranged not to overlap any one of the second indicating mechanism, the second chronograph train wheel, the minute chronograph train wheel and the hour chronograph train wheel.
    Type: Application
    Filed: March 25, 2004
    Publication date: October 21, 2004
    Inventors: Mamoru Watanabe, Takashi Takahashi, Katsuyoshi Takizawa, Shigeo Suzuki, Takeshi Tokoro