Patents by Inventor Hiroshi Tamagawa

Hiroshi Tamagawa 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: 20150305159
    Abstract: A chip capacitor according to the present invention includes a substrate, a pair of external electrodes formed on the substrate, a capacitor element connected between the pair of external electrodes, and a bidirectional diode connected between the pair of external electrodes and in parallel to the capacitor element. Also, a circuit assembly according to the present invention includes the chip capacitor according to the present invention and a mounting substrate having lands, soldered to the external electrodes, on a mounting surface facing a front surface of the substrate.
    Type: Application
    Filed: October 25, 2013
    Publication date: October 22, 2015
    Applicant: ROHM CO., LTD.
    Inventors: Hiroki YAMAMOTO, Keishi WATANABE, Hiroshi TAMAGAWA
  • Publication number: 20150216044
    Abstract: The chip part of the present invention includes a substrate, an electrode on the substrate and having a front surface in which a plurality of recessed portions are formed toward the thickness direction thereof, and an element region having a circuit element that is electrically connected to the electrode.
    Type: Application
    Filed: December 23, 2014
    Publication date: July 30, 2015
    Applicant: ROHM CO., LTD.
    Inventors: Hiroshi TAMAGAWA, Yasuhiro KONDO, Hiroki YAMAMOTO
  • Publication number: 20150034981
    Abstract: [Problem] There is a need for a chip component which has excellent mountability, which can accommodate multiple types of requested values with a common basic design, and which has improved geometric accuracy and micromachining accuracy. [Solution] A chip resistor (10) (chip component) which includes: a substrate (11); an element circuit network (20, 21) which includes multiple element parts formed on the substrate (11); an external connection electrode (12) provided on the substrate (11) for external connection to the element circuit network (20, 21); multiple fuses provided on the substrate (11) for detachably connecting the element parts and the external connection electrode (12); and a solder layer (124) formed on the external connection terminal of the external connection electrode (12).
    Type: Application
    Filed: December 26, 2012
    Publication date: February 5, 2015
    Applicant: ROHM CO., LTD.
    Inventors: Hiroshi Tamagawa, Hiroki Yamamoto, Katsuya Matsuura, Yasuhiro Kondo
  • Publication number: 20140368965
    Abstract: [Subject] To provide a highly-reliable and small-size chip component, e.g., a chip resistor having an accurate resistance value. [Solution] The chip resistor (10) includes: a substrate (11); a plurality of resistor elements each having a resistive film portion (20) provided on the substrate (11) and an aluminum-containing interconnection film portion (21) provided in contact with the resistive film portion (20); electrodes (12, 13) provided on the substrate (11); and a plurality of fuses (F) each having an aluminum-containing interconnection film portion integral with the aluminum-containing interconnection film portion of the resistor element and disconnectably connecting the resistor element to the electrodes (12, 13). [Effect] The resistance of the chip resistor can be adjusted at a desired resistance value by selectively disconnecting desired ones of the fuses.
    Type: Application
    Filed: January 8, 2013
    Publication date: December 18, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Yasuhiro Kondo, Hiroshi Tamagawa, Hiroki Yamamoto
  • Publication number: 20140361865
    Abstract: [Problem] There is demand for chip resistors that are compact and that have high resistivity. [Solution] A chip resistor (100) has a substrate (11), a first connection electrode (12) and a second connection electrode (13) that are formed on the substrate (11), and a resistor network that is formed on the substrate (11) and that has ends one of which is connected to the first connection electrode (12) and the other one of which is connected to the second connection electrode (13). The resistor network is provided with a resistive circuit. The resistive circuit has a resistive element film line (103) that is provided along inner wall surfaces of trenches (101). The resistive element film line (103) extending along the inner wall surfaces of the trenches (101) is long and has a high resistivity as a unit resistive element. [Effect] The resistivity of the chip resistor (100) as a whole can be increased.
    Type: Application
    Filed: September 28, 2012
    Publication date: December 11, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Hiroshi Tamagawa, Yasuhiro Kondo
  • Publication number: 20140354396
    Abstract: [Subject] To provide a chip resistor free from chipping of corner portions thereof and a method of producing the chip resistor. [Solution] The chip resistor (1) includes: a board (2) having a device formation surface (2A), a back surface (2B) opposite from the device formation surface (2A) and side surfaces (2C-2F) connecting the device formation surface (2A) to the back surface (2B), a resistor portion (56) provided on the device formation surface (2A), a first connection electrode (3) and a second connection electrode (4) provided on the device formation surface (2A) and electrically connected to the resistor portion (56), and a resin film (24) covering the device formation surface (2A) with the first connection electrode (3) and the second connection electrode (4) being exposed therefrom. Intersection portions (11) of the board (2) along which the back surface (2B) intersects the side surfaces (2C-2F) each have a rounded shape.
    Type: Application
    Filed: December 18, 2012
    Publication date: December 4, 2014
    Inventors: Eiji Nukaga, Hiroshi Tamagawa, Yasuhiro Kondo, Katsuya Matsuura
  • Publication number: 20140225220
    Abstract: [Theme] A compact and refined chip resistor, with which a plurality of types of required resistance values can be accommodated readily with the same design structure, was desired. [Solution Means] A chip resistor 10 is arranged to have a resistor network 14 on a substrate. The resistor network 14 includes a plurality of resistor bodies R arrayed in a matrix and having an equal resistance value. A plurality of types of resistance units are respectively arranged by one or a plurality of the resistor bodies R being connected electrically. The plurality of types of resistance units are connected in a predetermined mode using connection conductor films C and fuse films F. By selectively fusing a fuse film F, a resistance unit can be electrically incorporated into the resistor network 14 or electrically separated from the resistor network to make the resistance value of the resistor network 14 the required resistance value.
    Type: Application
    Filed: September 28, 2012
    Publication date: August 14, 2014
    Applicant: ROHM CO., LTD.
    Inventors: Hiroshi Tamagawa, Yasuhiro Kondo, Yasuhiro Fuwa, Hiroyuki Okada, Eiji Nukaga, Katsuya Matsuura
  • Patent number: 4827993
    Abstract: An automatic system for carrying a reservoir and metering liquid from the reservoir comprising a vertical shelf for storing a plurality of reservoirs therein, a transferring mechanism disposed adjacent the supply shelf for transferring a reservoir toward horizontal and vertical directions, a tilting device for receiving the reservoir and tilting it from an upright to a horizontal position, a valve mechanism for controlling a liquid flow through a valve attached to the reservoir, and a balance for supporting a collecting container to receive droppings from the valve. The transferring mechanism including a platform to support the reservoir thereon, an attracting means to draw out the reservoir, and a cylinder to move the reservoir back and forth.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: May 9, 1989
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Yoshito Ito, Hideyo Miyake, Hiroshi Tamagawa
  • Patent number: 4658236
    Abstract: A compact automatic signal cancelling apparatus for a direction indicator mounted on a motorcycle, engine driven bicycle or like vehicle is housed in a cylindrical member which is fixedly secured to the handlebar. A variable resistor is incorporated in the apparatus for detecting an angle of turning movement of the handlebar and its rotary shaft is connected to the body or frame of the motorcycle which serves as a reference point for the apparatus. As the handlebar is turned by the driver on the motorcycle, the apparatus in the cylindrical member is rotated while the rotary shaft of the variable resistor is kept immobable. The angle of turning movement of the handlebar is detected by the change in resistance value of the variable resistor, which is transmitted to a control circuit. The control circuit automatically turns on or off the signal on the direction indicator in response to detection of the change in resisting value of the variable resistance.
    Type: Grant
    Filed: September 27, 1984
    Date of Patent: April 14, 1987
    Assignee: Alps Electric Co., Ltd.
    Inventors: Tsumoru Oka, Hiroshi Tamagawa