Patents by Inventor Kenji Yokoyama

Kenji Yokoyama 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: 20030076312
    Abstract: Sensed image data are stored in a memory. Image data of a plurality of images associated with each other out of the stored image data are detected on the basis of a predetermined condition. The image data of the plurality of detected images are processed into image data of a predetermined display size. The same portion of the processed image data is extracted from each of the plurality of images. The extracted portions of the image data of the plurality of images are displayed on the same screen.
    Type: Application
    Filed: October 22, 2002
    Publication date: April 24, 2003
    Inventor: Kenji Yokoyama
  • Publication number: 20030062592
    Abstract: A semiconductor device in accordance with the present invention is equipped with a fuse element 13 that is formed on an interlayer dielectric film 14 and formed in the same layer as an Al alloy wiring in the uppermost layer, a silicon oxide film 16 formed over the fuse element 13 and the interlayer dielectric film 14, a silicon nitride film 17 formed on the silicon oxide film 16, and an window for fusing 17a formed in the silicon nitride film 17 and located above the fuse element 13.
    Type: Application
    Filed: August 27, 2002
    Publication date: April 3, 2003
    Inventors: Hisakatsu Sato, Hiro Sato, Masashi Miura, Yuriko Watanabe, Kenji Yokoyama
  • Publication number: 20020190792
    Abstract: A digital power amplifier has a reduced size, high output, high efficiency and low power consumption. Electrical isolation is provided between input and output sections by a photo-coupler on a transmission passage for turning into a digital signal.
    Type: Application
    Filed: June 13, 2002
    Publication date: December 19, 2002
    Applicant: FLYING MOLE CORPORATION
    Inventors: Kenji Yokoyama, Yasuo Yamada
  • Patent number: 6495101
    Abstract: A hollow fiber membrane oxygenator of external blood circulation type has a housing and a lot of porous hollow fiber membranes for gas transfer housed in the housing. In the oxygenator, blood flows along the outer side of the hollow fiber membranes, whereas oxygen-containing gas flows along the inner side thereof. An outer surface or outer layer of the hollow fiber membrane as a blood-contacting portion is coated with synthetic polymer mainly formed of alkoxyalkyl(meta)acrylate containing a C(1-4)alkoxy group and a C(1-4)alkyl group. An intermediate layer and inner layer of the hollow fiber membranes contain substantially no synthetic polymer.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: December 17, 2002
    Assignee: Terumo Kabushiki Kaisha
    Inventors: Kenji Yokoyama, Takao Anzai, Atsuo Okumura, Yuu Kasori
  • Publication number: 20020094300
    Abstract: A blood reservoir being capable of reducing damage to blood stored therein. The blood reservoir has a housing in the form of a box, and filtering and defoaming devices provided in the housing, i.e., a device for filtering and defoaming on blood suctioned from a surgical field (outside a heart), a device for filtering and defoaming on blood vented from the interior of the heart, and a device for filtering and defoaming on blood drawn off from a large vein. The vented blood flowing into the blood reservoir passes through a vented blood filtering member to be introduced into a blood storage space without contacting an antifoaming agent and foreign substances filtered off from the suctioned blood.
    Type: Application
    Filed: November 30, 2001
    Publication date: July 18, 2002
    Inventors: Kenji Yokoyama, Kazuhiko Takeuchi
  • Publication number: 20020025834
    Abstract: In a mobile system, a power supply switch 34 receives the output from a clock 33 and a CPU 1, and selectively supplies the power supplied from the Bup line to position measuring means comprising a GPS receiver 4, a GPS antenna 5, a gyro 6, and a transit distance sensor 7 via a stabilizer 35, enabling the position measuring means to continue the position measuring operation after stopping the main operation of the mobile system.
    Type: Application
    Filed: March 21, 2001
    Publication date: February 28, 2002
    Inventors: Mutsurou Tanoue, Kenji Yokoyama, Yoshikazu Yamada, Katsumi Takei, Isao Endo, Noriyoshi Kiuchi, Kazuo Murata, Takuji Kimura
  • Publication number: 20020003289
    Abstract: Certain embodiments relate to semiconductor devices having an improved dielectric strength and methods for manufacturing the same. A semiconductor device 1000 may have a field effect transistor 100. The field effect transistor 100 includes a gate dielectric layer 30, a source region 32 and a drain region 34. A semi-recessed LOCOS layer 40 may be provided between the gate dielectric layer 30 and the drain region 34. An offset impurity layer 42 may be provided below the semi-recessed LOCOS layer 40.
    Type: Application
    Filed: May 1, 2001
    Publication date: January 10, 2002
    Inventors: Tatsuru Namatame, Kenji Yokoyama
  • Publication number: 20020003290
    Abstract: Certain embodiments relate to semiconductor devices having an improved dielectric strength and methods for manufacturing the same. A semiconductor device 1000 may have a field effect transistor 100. The field effect transistor 100 includes a gate dielectric layer 30, a source region 32 and a drain region 34. A first semi-recessed LOCOS layer 40 may be formed between the gate dielectric layer 30 and the drain region 34. A second semi-recessed LOCOS layer 50 may be formed between the gate dielectric layer 30 and the source region 32. A first offset impurity layer 42 may be formed below the first semi-recessed LOCOS layer 40.
    Type: Application
    Filed: May 1, 2001
    Publication date: January 10, 2002
    Inventors: Tatsuru Namatame, Kenji Yokoyama
  • Patent number: 6304687
    Abstract: In a light waveguide circuit including a plurality of waveguides having different length, a material (10) having a temperature coefficient of a refractive index including a symbol different from that of a temperature coefficient of an effective refractive index of the waveguide (4) is charged into a groove (12) formed by removing the upper clad and the core from the waveguide (4), or a groove (12) formed by removing the upper clad, the core and the lower clad from the waveguide (4). A difference in length of the removed portions between adjacent waveguides is proportional to a difference in length of the waveguides which were not removed and remained.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: October 16, 2001
    Assignees: Nippon Telegraph and Telephone Corporation, NTT Electronics Corporation
    Inventors: Yasuyuki Inoue, Akimasa Kaneko, Hiroshi Takahashi, Fumiaki Hanawa, Kuninori Hattori, Kenji Yokoyama, Senichi Suzuki, Shin Sumida, Katsunari Okamoto, Motohaya Ishii, Hiroaki Yamada, Takashi Yoshida, Koichi Arishima, Fumihiro Ebisawa, Motohiro Nakahara
  • Publication number: 20010010744
    Abstract: An optical module capable of connecting signal lines to an external substrate easily without causing any degradation of the transmission characteristic is disclosed. The optical module comprises an optical element mounting block having an optical element mounting section and an optical fiber guide, and a wiring lead integrated resin substrate having a ferrule holding section, an optical element mounting block housing section, and wiring leads, where at least a part of the wiring leads are provided by signal lines in a coplanar guide structure entirely formed on the wiring lead integrated resin substrate such that a characteristic impedance does not change when the wiring leads are electrically connected to external wirings.
    Type: Application
    Filed: January 17, 2001
    Publication date: August 2, 2001
    Inventors: Yoshito Shuto, Michiyuki Amano, Kenji Yokoyama, Takeshi Kurosaki, Takashi Tadokoro, Makoto Nakamura, Masanobu Okayasu, Noboru Ishihara, Shin Sumida, Shunichi Tohno
  • Patent number: 6222967
    Abstract: A packaging platform for optically coupling one or more optical waveguides of one or more optical components having the optical waveguide to one or more optical fibers is provided with a reference structure portion for the horizontal and vertical positioning of the optical component. The platform is further provided with one or more fiber positioning portions for inserting and holding the optical fiber and positioning the optical fiber at a position where the optical fiber is optically connected to the optical waveguide. The provided packaging platform and an optical module using the platform can simplify all alignment steps for optical coupling, electrical connection and sealing in the coupling of the optical component and the optical fiber.
    Type: Grant
    Filed: March 13, 1998
    Date of Patent: April 24, 2001
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Michiyuki Amano, Shunichi Tono, Hirotsugu Sato, Yasuaki Tamura, Yoshito Shuto, Kenji Yokoyama, Haruki Kozawaguchi, Makoto Hikita, Ryoko Yoshimura, Satoru Tomaru, Saburo Imamura, Toshikazu Hashimoto, Yasufumi Yamada, Kuniharu Kato, Masahiro Yanagisawa, Akio Sugita
  • Patent number: 5880943
    Abstract: A snubber circuit is provided for a switching power source including a dc power source, a switching circuit and a transformer having a primary coil and a secondary coil in which the primary coil is connected to the dc power source through the switching circuit and an output is produced from the secondary coil by driving the switching element. The snubber circuit has a series circuit of a capacitor and a switching device connected in parallel to the primary coil of the transformer and in series to the switching element. The switching device is turned on substantially simultaneously with turning off of the switching element and thereby at this time causes resonance to be produced between the primary coil and the capacitor by energy which has been accumulated in the primary coil and causes the accumulated energy to be transferred to the secondary coil by the resonance. The switching device is turned off before turning on of the switching element.
    Type: Grant
    Filed: April 22, 1997
    Date of Patent: March 9, 1999
    Assignee: Yamaha Corporation
    Inventor: Kenji Yokoyama
  • Patent number: 5838556
    Abstract: A switching power supply circuit capable of accuraely performing a switching starting operation at a large load while reducing power consumption during an overload state is a back-boost type switching power supply circuit and includes a first transistor provided on a primary side and a second transistor which controls the first transistor, a first rectified output generation circuit for rectifying and outputting a forward mode output from a first auxiliary winding, a second rectified output generation circuit for rectifying and outputting a back-boost mode output from a second auxiliary winding, a threshold value circuit for judging presence of an overload state when the output of the second rectified output generation circuit is below a predetermined threshold value, a third transistor for oscillation control which brings the first transistor into an intermittent oscillation state when the overload state has been judged, and a differentiating circuit for detecting a starting time by differentiating the outpu
    Type: Grant
    Filed: September 11, 1996
    Date of Patent: November 17, 1998
    Assignee: Yamaha Corporation
    Inventor: Kenji Yokoyama
  • Patent number: 5751560
    Abstract: A transformer has a primary winding including a first end which is connected to a first input terminal. A switching transistor is connected between a second end of the primary winding and a second input terminal. Timing circuits control an on-off operation of the transistor while a rectifying and smoothing circuit provided on the secondary side of the transformer rectifies and smooths an output from the transformer. In the switching power circuit, a parallel circuit of a capacitor and an inductance element absorbs charges from the capacitor connected in series to the primary winding of the transformer, while a resonance capacitor connected between the collector and the emitter of the switching transistor forms a voltage resonance circuit with the main inductance of the primary winding of the transformer.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: May 12, 1998
    Assignee: Yamaha Corporation
    Inventor: Kenji Yokoyama
  • Patent number: 5621494
    Abstract: The present invention relates to a camera having a light-source determining function for determining the kind of light source. According to the present invention, the light-source determining function of the camera is realized by using the output of a light receiving part of a remote control processing part of the camera.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: April 15, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jiro Kazumi, Toru Nagata, Kenji Yokoyama
  • Patent number: 5515256
    Abstract: In a switching power supply circuit in which a primary winding of a, transformer is connected to a DC voltage source through a switching transistor which is turned on and off at a predetermined frequency by voltage of auxiliary windings of the transformer, an integrating circuit is provided between the auxiliary winding of the transformer and the base of the switching transistor for making the waveform of base driving current for the switching transistor similar to the waveform of collector current in a steady state. In parallel with this integrating circuit, a differentiating circuit is provided between the auxiliary winding N3 of the transformer and the base of the switching transistor for operating only at the start of the switching power supply circuit to supply base driving current of a large magnitude to the switching transistor.
    Type: Grant
    Filed: August 29, 1994
    Date of Patent: May 7, 1996
    Assignee: Yamaha Corporation
    Inventor: Kenji Yokoyama
  • Patent number: 5419938
    Abstract: A magnetic recording medium includes a coated type of magnetic layer containing magnetic powders substantially made up of hexagonal ferrite particles and a binder, and has the values ofSQR.sub.x .gtoreq.0.50SQR.sub.y .ltoreq.0.35where SQR.sub.x is the squareness ratio of said magnetic layer in the recording track direction, and SQR.sub.y is the intra-surface squareness ratio of said magnetic layer in the direction perpendicular to the recording track direction, and has also the value of.alpha..gtoreq.3%where .alpha. is given by.alpha.=I(006).times.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: May 30, 1995
    Assignee: TDK Corporation
    Inventors: Tsuneo Kagotani, Kenji Yokoyama, Keiji Koga, Yasumichi Tokuoka
  • Patent number: 5355189
    Abstract: A camera with a built-in or removable, zoom flash unit having an illumination angle that varies automatically in accordance with the focal length of a photographic zoom lens that is attached to the camera. The camera inhibits the shutter release until the illumination angle of the zoom flash unit has reached a value corresponding with the focal length selected for the zoom lens.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: October 11, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryuichi Kobayashi, Hidehiko Fukahori, Kenji Yokoyama, Tsuyoshi Fukuda
  • Patent number: 5312772
    Abstract: In a semiconductor device including a substrate of Si or polycrystalline silicon and an interlayer insulation film region, a region for interconnection with the substrate is composed of a refractory metal silicide layer, a refractory metal nitride layer, an Al or Al alloy layer, and possibly a further refractory metal nitride layer, while a region for interconnection on the interlayer insulation film on the substrate is composed of a refractory metal, or refractory metal oxide layer, a refractory metal nitride layer, an Al or Al alloy layer, and possibly a further refractory metal nitride layer, providing interconnections for integrated circuits. In the manufacture of this interconnection structure, rapid thermal annealing is performed at 600.degree.-1000.degree. C. on the refractory metal nitride layer of the region for interconnection with the substrate, followed by the formation of Al or Al alloy layer.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: May 17, 1994
    Assignee: Seiko Epson Corporation
    Inventors: Kenji Yokoyama, Juri Kato, Masashi Ogita
  • Patent number: 5280543
    Abstract: An acoustic apparatus comprises a cabinet, and a loudspeaker unit and a driving apparatus disposed in the cabinet. The acoustic apparatus is driven by an external power amplifier which normally constant-voltage-drives a conventional loudspeaker. The driving apparatus has a power amplifier circuit and a transfer function control circuit, and drives the loudspeaker unit in cooperation with the external power amplifier. The driving apparatus generates an electric energy corresponding to an increase in energy from that which is required in a normal constant-voltage-driving, the increase being produced by an operation of the transfer function control circuit, and the generated energy is inputted to the loudspeaker unit.
    Type: Grant
    Filed: April 27, 1993
    Date of Patent: January 18, 1994
    Assignee: Yamaha Corporation
    Inventors: Kenji Yokoyama, Masao Noro