Patents by Inventor Yukio Nakamura

Yukio Nakamura 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: 5869221
    Abstract: A method of fabricating an LED array includes forming a first insulating film composed of aluminum oxide on a semiconductor substrate of a first conductive type; patterning the first insulating film by photolithography to form a plurality of first windows; diffusing an impurity of a second conductive type through the plurality of first windows into the first insulating film, thereby forming a plurality of diffusion regions of the second conductive type below the plurality of first windows; forming a second insulating film on the first insulating film and the plurality of first windows; patterning the second insulating film by photolithography to-remove the second insulating film from the plurality of first windows, using an etchant that does not etch the first insulating film; forming a metal film on the second insulating film and the plurality of first windows; and patterning the metal film by photolithography to form a plurality of electrodes which make electrical contact with respective diffusion regions.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: February 9, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Takatoku Shimizu, Masumi Taninaka
  • Patent number: 5869848
    Abstract: An end face light-emitting-type LED has a first-conductive-type semiconductor substrate and a second-conductive-type diffusion region formed on a first surface of the first-conductive-type semiconductor substrate so as to have a depth within a predetermined value. The first-conductive-type semiconductor substrate has a second surface which meets the first surface at a predetermined angle with the first surface. A junction between the first-conductive-type semiconductor substrate and the second-conductive-type diffusion region includes an inclined portion with regard to the first surface in the vicinity of an edge portion of the junction which is on a side of the second surface, and light emerges from the junction via the second surface.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: February 9, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Masaharu Nobori, Hiroyuki Fujiwara, Masumi Koizumi, Aya Yamanaka, Makoto Ishimaru, Yukio Nakamura
  • Patent number: 5821567
    Abstract: A light-sensing/emitting diode array chip has impurity diffusion regions with a depth of at least 0.5 .mu.m but not more than 2 .mu.m in a semiconductor substrate. Each impurity diffusion region is preferably divided into a first region, used for emitting or sensing light, and a wider second region, used for electrode contact. The second regions are located on alternate sides of the array line, permitting a small array pitch to be combined with a large contact area. In a wafer process for fabrication of the chips, a diffusion mask has both windows defining the impurity diffusion regions, and dicing line marks. The dicing line marks are narrowed where they pass adjacent to the windows at the ends of the chip. In the electrode fabrication step, a photomask with an enlarged pattern is used, to allow for misalignment with the diffusion mask.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: October 13, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Takatoku Shimizu, Masumi Taninaka
  • Patent number: 5734406
    Abstract: A driver IC includes a plurality of electrode pads on a belt-shaped power supply electrode. The electrode pads are arrayed with a pitch dividing a row of driver circuits into groups of equal number. A power source voltage VDD is supplied through the plurality of the electrode pads. Further, the power supply electrode is disposed between the digital circuits and the driver circuits. A print head includes the driver IC with a plurality of light emitting elements connected thereto. A printer includes the print head in combination with photo sensitive drum, a lens array, a charger, a developer and a transcriber.
    Type: Grant
    Filed: April 7, 1994
    Date of Patent: March 31, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yukio Nakamura, Hiroshi Furuya, Takashi Ishizaki, Takeyuki Yanagibashi
  • Patent number: 5733689
    Abstract: A method of fabricating an LED array includes (a) forming a first insulating film composed of aluminum oxide on a semiconductor substrate of a first conductive type; (b) patterning the first insulating film by photolithography to form a plurality of first windows; (c) diffusing an impurity of a second conductive type through the plurality of first windows into the first insulating film, thereby forming a plurality of diffusion regions of the second conductive type below the plurality of first windows; (d) forming a second insulating film on the first insulating film and the plurality of first windows; (e) patterning the second insulating film by photolithography to remove the second insulating film from the plurality of first windows, using an etchant that does not etch the first insulating film; (f) forming a metal film on the second insulating film and the plurality of first windows; and (g) patterning the metal film by photolithography to form a plurality of electrodes which make electrical contact with re
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: March 31, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Takatoku Shimizu, Masumi Taninaka
  • Patent number: 5700714
    Abstract: A pn-junction element is formed in a compound semiconductor substrate by depositing an aluminum-nitride film on the surface of the substrate, patterning the aluminum-nitride film to form a diffusion mask, depositing a diffusion source film on the diffusion mask, diffusing an impurity from the diffusion source film into the substrate, and removing the diffusion source film with buffered hydrofluoric acid. Electrode lines can then be formed directly on the aluminum-nitride diffusion mask, which is not etched by buffered hydrofluoric acid.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: December 23, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Masumi Koizumi, Masumi Taninaka
  • Patent number: 5689491
    Abstract: A method for optically writing/reading information is disclosed, where information is written onto and read from an information recording medium. Light is emitted from a light emitting element and is split into a zero-order diffracted light and a first-order diffracted light by way of a diffraction grating. The zero-order diffracted light and the first-order diffracted light are focused from the diffraction grating onto the information recording medium such that at least a portion of at least the first-order diffracted light is reflected from the information recording medium. The reflected first-order diffracted light is focused from the information recording medium onto a light receiving element paired with and positioned adjacent the light emitting element.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: November 18, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Minoru Isobe, Yukio Nakamura
  • Patent number: 5600157
    Abstract: According to a first aspect of the invention, a light-emitting and light-sensing diode has a doped region with a depth not exceeding 2 .mu.m, for adequate sensitivity, and an impurity concentration of at least 5.times.10.sup.20 atoms/cm.sup.-3, for adequate emission. According to a second aspect of the invention, a light-emitting and light-sensing diode has a doped region with a deep part and a shallow part, and the area of the shallow part is increased to enhance the sensitivity of the diode. This may be done by providing the doped region with a meandering edge, or with one or more interior islands, or by forming the deep and shallow parts separately.
    Type: Grant
    Filed: May 29, 1996
    Date of Patent: February 4, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Ichimatsu Abiko, Yukio Nakamura, Katsuzo Kaminishi, Takatoku Shimizu, Kazuo Tokura, Yasuo Iguti, Hiroshi Furuya, Mituhiko Ogihara, Masumi Taninaka, Mio Chiba
  • Patent number: 5586096
    Abstract: The present invention comprises an optical write/read device including a light emitting/receiving portion having light emitting elements and light receiving elements which are arranged in parallel with one another, and a simple optical system. In the optical system, light emitted from the light emitting element is lead to an information recording medium, and light reflected on the information recording medium among lights emitted from the light emitting elements is lead to the light receiving element. Accordingly, the light emitting element can be used as a recording light source and a reading light source, and further the light receiving elements arranged in parallel with the light emitting elements can be used as an optical detector. The information recording medium employed by the optical write/read device includes a column of positional aligning marks.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: December 17, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Minoru Isobe, Yukio Nakamura
  • Patent number: 5530268
    Abstract: An LED array is fabricated by forming an insulating film on a semiconductor substrate of a first conductive type, forming a plurality of windows in the insulating film, and diffusing an impurity of a second conductive type through these windows to create a plurality of diffusion regions. In addition, an anti-reflection coating consisting of one or more transparent dielectric thin films is formed on the diffusion regions where they are exposed in the windows. The thickness of the anti-reflection coating, or of its constituent thin films, is optimized for maximum transmission of light.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: June 25, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Takatoku Shimizu, Masumi Taninaka
  • Patent number: 5523590
    Abstract: An LED array, including a semiconductor substrate of a first conductive type; a first insulating film formed on the substrate, comprising aluminum oxide and having a plurality of first windows; a second insulating film formed on the first insulating film, having a plurality of second windows aligned respectively with the plurality of first windows, the plurality of second windows being formed by a photolithography process that does not etch the first insulting film; a plurality of diffusion regions of a second conductive type, formed by diffusion of an impurity of the second conductive type through the plurality of first windows into the semiconductive substrate, for creating pn junctions from which and from near which light is emitted, principally through the plurality of first windows and the plurality of second windows; and a plurality of electrodes formed on the second insulating film, extending through the plurality of first windows and the plurality of second windows, and making electrical contact with
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: June 4, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuhiko Ogihara, Yukio Nakamura, Takatoku Shimizu, Masumi Taninaka
  • Patent number: 5457488
    Abstract: An array of light-emitting elements is switched on and off to produce a graded-intensity image on a photosensitive medium. Each light-emitting element is controlled by M-bit data representing the intensity of one image pixel, where M is a fixed integer greater than one. M strobe signals are generated for non-overlapping time intervals of different lengths, to strobe the M data bits for each light-emitting element. When strobed, each data bit switches its corresponding light-emitting element on or off. Image intensity depends on the total amount of time for which each light-emitting element is switched on.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: October 10, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yukio Nakamura, Hiroshi Furuya, Takatoku Shimizu, Kazuo Tokura, Mio Chiba, Kengo Ohtaka, Takeyuki Yanagibashi, Takashi Ishizaki
  • Patent number: 5424855
    Abstract: An array of LEDs is controlled by a control circuit so as to emit light in a write mode and sense light in a read mode. In the read mode, each LED is alternately charged for a first interval, then allowed to discharge by flow of photocurrent for a second interval. At the end of the second interval, just before charging of the LED begins again, the anode voltage of the LED is read by coupling the anode of the LED to an output terminal for a third interval. The third interval of each LED may coincide with the first interval of the preceding LED in tile array, so that each LED is read while the preceding LED is being charged.
    Type: Grant
    Filed: May 4, 1994
    Date of Patent: June 13, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yukio Nakamura, Kazuo Tokura, Shigemitsu Horikawa, Tokio Sato
  • Patent number: 5212472
    Abstract: A method is for driving a gas discharge type light emission apparatus having an electrode block line(s) constituted by electrode blocks. Scanning of adjacent cathodes, one being in one of two adjacent electrode blocks and the other being in the other electrode block, is effected such that subsequent to the scanning of one adjacent cathode, at least one cathode other than the other adjacent cathode is scanned prior to the scanning of the other adjacent cathode. By the method, crosstalk between adjacent electrode blocks is prevented without the provision of a partitioning member between the adjacent electrode blocks. A gas discharge type light emission apparatus includes an anode(s) on a front substrate and cathodes on a rear substrate. The anodes and cathodes face one another via a discharge gas medium to constitute discharge cells. The anodes are made of a light-blocking material and including windows at positions corresponding to the cathodes.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: May 18, 1993
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Atsushi Takahashi, Hiroshi Furuya, Hideo Sawai, Mio Chiba, Yukio Nakamura, Masao Ikehata, Hiroshi Tohyama, Hiromi Takahashi, Yoshitaka Terao, Yuuji Terouchi
  • Patent number: 5173644
    Abstract: A convergence correction apparatus comprising a core for producing a bias magnetic field. The core has first, second, third and fourth coils provided thereon. The first and second coils are wound to produce a magnetic field in a direction opposite to the direction of the bias magnetic field. The third and fourth coils are wound to produce a magnetic field in the same direction as the direction of the bias magnetic field. The first and fourth coils are connected to form a first series circuit connected in parallel with a second series circuit of the third and second coils. A first terminal is connected to a junction between the first and third coils. A second terminal is connected to a junction between the second and fourth coils. A convergence correction coil is connected at one end thereof to a junction between the first and fourth coils and at the other end thereof to a junction between the second and third coils. A horizontal deflection current is applied between the first and second terminals.
    Type: Grant
    Filed: March 9, 1992
    Date of Patent: December 22, 1992
    Assignee: Sony Corporation
    Inventors: Kyousuke Aoki, Shuichirou Maekawa, Kazuhiko Endo, Yukio Nakamura
  • Patent number: 5167272
    Abstract: The present invention provides a mold additive for continuous casting which comprises adjusting an additive for stationary casting containing a flux base and, if necessary, a melting property regulator wherein it contains 4-30 wt % of MgO and 4-30 wt % of ZrO.sub.2 and CaO/SiO.sub.2 is 0.5-1.5.
    Type: Grant
    Filed: March 15, 1991
    Date of Patent: December 1, 1992
    Assignees: Nippon Steel Corporation, Kamogawa Industry Co., Ltd.
    Inventors: Shozo Shima, Yukio Nakamura, Masahiro Nakamura, Masanobu Kanayama
  • Patent number: 5159313
    Abstract: An oil supply system for an internal combustion engine, having an oil supplementing pump and an oil level sensor arranged in an oil pan for initiating the operation of the oil supplementing pump. A temperature of the oil is detected every time the engine is stopped, and this value is stored. A drop in the temperature of the oil when the engine is started is detected from the stored value of the temperature obtained when the engine was stopped. When a drop of the engine temperature is larger than a predetermined value, an oil supplementing operation is carried out.
    Type: Grant
    Filed: June 5, 1990
    Date of Patent: October 27, 1992
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takeo Kawai, Yukio Nakamura, Akio Kuramoto
  • Patent number: 5095037
    Abstract: A pharmaceutical composition for treating inflammatory diseases, comprising (A) an effective amount of hyaluronic acid or its salt, and (B) an effective amount of an anti-inflammatory agent. The composition exhibits a synergistic therapeutic effect on inflammations and is useful for treating inflammatory diseases, particularly diseases of joint with inflammation.
    Type: Grant
    Filed: December 6, 1990
    Date of Patent: March 10, 1992
    Assignee: Nissho Corporation
    Inventors: Kenichi Iwamitsu, Yukio Nakamura, Masahiro Kawasaki, Yoshio Fukui
  • Patent number: 5069832
    Abstract: A method for degating an injection molded plastic article includes the steps of filling a mold cavity with a molten plastic, dwelling and cooling the mold subsequent to filling to effect gate seal. A first degating punch and a second punch are provided slidably inserted in holes in the mold which cross a gate in an axial direction, being the direction in which a movable mold half is opened and closed. The punches are vibrated at a high frequency after gate seal is completed in order to soften the solidified plastic in the gate. The punches are then displaced with respect to the gate when the plastic is softened in order to effect degating. In another method, a step of cutting the gate in the molded article by sliding the punches occurs during both dwelling after filling the mold with the molten plastic, and cooling subsequent to the completion of dwelling, and before gate seal is effected.
    Type: Grant
    Filed: October 17, 1990
    Date of Patent: December 3, 1991
    Assignees: Kabushiki Kaisha Fujikoshi, Nissui Kako Co., Ltd.
    Inventors: Toshikata Okumura, Yukio Nakamura, Noriei Yoneoka, Syuiti Hachikawa
  • Patent number: D396846
    Type: Grant
    Filed: April 16, 1997
    Date of Patent: August 11, 1998
    Assignee: Matsushita Electronics Corporation
    Inventors: Masao Nakayama, Yukio Nakamura, Isamu Yuasa, Noboru Yoshida, Katsuji Tara, Toshio Fujiwara