Patents by Inventor Seiichi Yamamoto

Seiichi Yamamoto 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: 20050001569
    Abstract: An amplitude normalization circuit 13 finds the amplitude of position signals outputted from a position detection circuit 6 on the basis of Hall signals from Hall elements 2a to 2c. The position signals from the position detection circuit 6 are then divided by the thus found amplitude and are thereby normalized. Multiplier circuits 7a to 7c then multiply by a torque error signal limited by a limiter 5 the position signals normalized by the amplitude normalization circuit 13 to generate pseudo-sinusoidal signals.
    Type: Application
    Filed: February 5, 2004
    Publication date: January 6, 2005
    Inventor: Seiichi Yamamoto
  • Publication number: 20040246043
    Abstract: Connected to a power element having a first electrode, a second electrode, and a control electrode, a power element protection circuit detects a voltage between the first and second electrodes of the power element and the current flowing through the power element, then logarithmically converts a current proportional to the detected voltage and a current proportional to the detected current individually, then adds the results together, then subtracts a predetermined value from the sum, then antilogarithmically converts the result with an antilogarithmic converter, and then limits the driving of the power element based on the output of the antilogarithmic converter.
    Type: Application
    Filed: May 19, 2004
    Publication date: December 9, 2004
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda
  • Publication number: 20040164786
    Abstract: The drain of a power transistor M1 is connected to the non-inverting input terminal of an operational amplifier A and the drain of a transistor M2 is connected to the inverting input terminal of the operational amplifier A to make substantially equal the drain voltages of the power transistor M1 and the transistor M2, of which the gates are connected together and of which the sources are connected together. The drain current of the transistor M2 is outputted via a detection terminal 13 as a current signal proportional to the drain current of the power transistor M1.
    Type: Application
    Filed: February 24, 2004
    Publication date: August 26, 2004
    Applicant: ROHM CO., LTD.
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda
  • Publication number: 20040165488
    Abstract: A driver IC 1 has a bias terminal 20a via which a bias voltage fed from a microcomputer 2 to drive and control a loading motor 4 is fed in and a bias terminal 20b via which a bias voltage fed from a DSP 3 to drive and control a focus coil 5, a tracking coil 6, a sled motor 7, and a spindle motor 8 is fed in.
    Type: Application
    Filed: February 17, 2004
    Publication date: August 26, 2004
    Applicant: ROHM CO., LTD.
    Inventors: Seiichi Yamamoto, Kenichi Niiyama, Nobuo Nakamachi, Yoshiki Tanaka, Shinsuke Takagimoto
  • Publication number: 20040155618
    Abstract: An input signal Va is compared with a limitation signal Vlim. When the input signal Va exceeds the limitation signal Vlim, an excess (Va−Vlim) is obtained as an excess signal Vext. In a signal output circuit 60, the excess signal Vext is subtracted from the input signal Va and an output signal Vo is sent.
    Type: Application
    Filed: January 23, 2004
    Publication date: August 12, 2004
    Applicant: ROHM CO., LTD.
    Inventor: Seiichi Yamamoto
  • Publication number: 20040150930
    Abstract: By voltage limiting means, which provided in an IC as one of the components of an electronic apparatus, and a resistor, which is provided between a voltage input terminal of the IC and an external terminal of the electronic apparatus, an unexpected abnormal voltage generated in a DC power source such as an AC adaptor can be limited, and an overvoltage of not less than a predetermined value can be also prevented from being applied to the IC.
    Type: Application
    Filed: January 21, 2004
    Publication date: August 5, 2004
    Applicant: ROHM CO., LTD.
    Inventors: Kenichi Niiyama, Seiichi Yamamoto
  • Publication number: 20040028910
    Abstract: A transfer sheet having a low-reflection layer characterized by comprises: a transparent low-reflection layer; a protective layer; and an adhesive layer successively laminated on a releasable base film.
    Type: Application
    Filed: July 30, 2003
    Publication date: February 12, 2004
    Inventors: Seiichi Yamamoto, Yuzo Nakamura, Junichi Ikeda, Hidesato Mano
  • Patent number: 6690212
    Abstract: An inductive load driving circuit includes a switching transistor and a guardring. The switching transistor is connected between an output terminal and a power supply potential point. The guardring is an N-type semiconductor region provided for the switching transistor and connected to the power supply potential point.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: February 10, 2004
    Assignee: Rohm Co., Ltd.
    Inventor: Seiichi Yamamoto
  • Publication number: 20040023175
    Abstract: The invention provides a photothermographic material including, on a same surface of a substrate, photosensitive silver halide grains, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the photosensitive silver halide grains include iridium and a metal of groups 3 to 10 of the periodic table other than iridium, and 90% or more of the total iridium amount within the grain are contained in a core of 50% or less of the grain.
    Type: Application
    Filed: July 8, 2003
    Publication date: February 5, 2004
    Inventor: Seiichi Yamamoto
  • Publication number: 20040005522
    Abstract: The present invention provides a photothermographic material including a support having disposed on one surface thereof at least one image-forming layer containing a binder, an organic silver salt, a reducing agent for reducing silver ions, an organic polyhalogen compound and a photosensitive silver halide, wherein the photosensitive silver halide has a silver iodide content ranging from 10 mol % to 100 mol %. The silver halide further contains at least one metal selected from a first metal group and one metal selected from a second metal group, with a proviso that none of the at least one metal selected from the first metal group and the at least one metal selected from the second metal group are the same.
    Type: Application
    Filed: June 25, 2003
    Publication date: January 8, 2004
    Inventors: Yutaka Oka, Seiichi Yamamoto
  • Publication number: 20030235795
    Abstract: The object of the present invention is to provide a photothermographic material improved in the aging stability of unprocessed photosensitive material and/or in the image stability after the processing, which is a photothermographic material of the invention comprising a support and on the same surface of the support, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein the concentration of chloride contained on the same surface is 1,000 ppm or less based on the organic silver salt.
    Type: Application
    Filed: August 22, 2002
    Publication date: December 25, 2003
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Hajime Nakagawa, Yoshihisa Tsukada, Seiichi Yamamoto, Takayoshi Oyamada, Kouta Fukui
  • Publication number: 20030232288
    Abstract: Disclosed are photothermographic materials having, on a support, a layer that contains at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the mean silver iodide content of the photosensitive silver halide falls between 5 and 100 mol %, preferably between 40 and 100 mol %.
    Type: Application
    Filed: November 1, 2002
    Publication date: December 18, 2003
    Inventors: Yutaka Oka, Tomoyuki Ohzeki, Katsutoshi Yamane, Seiichi Yamamoto, Sumito Yamada, Hiroyuki Mifune, Tadashi Inaba, Kohzaburoh Yamada, Katsuyuki Watanabe
  • Publication number: 20030224307
    Abstract: A photothermographic material including a substrate carrying on one surface thereof an image forming layer containing at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for a silver ion, and a binder, wherein the photosensitive silver halide has a silver iodide content of 40 to 100 mol %, and an average particle size of 5 to 80 nm, and the photothermographic material contains a compound of the following general formula (1);
    Type: Application
    Filed: April 14, 2003
    Publication date: December 4, 2003
    Inventors: Seiichi Yamamoto, Eiichi Okutsu, Tomoyuki Ohzeki
  • Publication number: 20030190565
    Abstract: A heat developable image recording material including a photosensitive silver halide, a reducing agent for silver ions, a binder and non-photosensitive organic acid silver salt particles on one side of the surface of a substrate. A content of silver behenate in the non-photosensitive organic acid silver salt particles is 90 mol % to 100 mol %, and at least one kind of mercapto compound is contained in a surface of the substrate at the same side as a layer having the photosensitive silver halide. The heat developable image recording material includes a compound represented by following the general formula (1) wherein, R21, R22 and R23 each independently represent a substituted or non-substituted alkyl group. When R21, R22 or R23 have a substituent, the substituent is a halogen atom etc. The non-photosensitive organic particles are prepared from organic acids including at least behenic acid and erucic acid, and a content of the erucic acid is 0.000001 mol % to 0.4 mol %.
    Type: Application
    Filed: October 24, 2002
    Publication date: October 9, 2003
    Inventors: Itsuo Fujiwara, Seiichi Yamamoto, Takayoshi Oyamada
  • Publication number: 20020192378
    Abstract: On a print pattern (12T) transferred on an objective body (34) under a liquid pressure is formed an intermediate coat layer (42) containing a binder resin of a graft copolymer comprising two unsaturation group containing vinyl monomers having respective glass transition temperatures different from each other and then a protection coat layer (46) containing at least one of an acrylic polyol resin having a hydroxyl value of 10-200 mgKOH/g and a polyester polyol resin having a hydroxyl group of 10-400 mgKOH/g.
    Type: Application
    Filed: October 10, 2001
    Publication date: December 19, 2002
    Inventors: Nobuyuki Hori, Seiichi Yamamoto
  • Publication number: 20020168059
    Abstract: Upon providing a new service associated with a key telephone unit to an user system, a customer center periodically acquires communication log information of the key telephone unit, generates suggestion information of an inside comprise, which is optimal to the key telephone unit, on the basis of the communication log information, and automatically transmits that suggestion information to a maintenance personal computer via the Internet.
    Type: Application
    Filed: March 27, 2002
    Publication date: November 14, 2002
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yoshimitsu Ebisawa, Seiichi Yamamoto, Hitoshi Kato, Yoshihiro Kawauchi, Yasuo Funato, Takeshi Makita
  • Publication number: 20020163366
    Abstract: A circuit has first and second switching transistors that are connected between a power supply potential point and ground potential point GND, and controllably turned on and off to drive an inductive load. The circuit is provided with an N-type guardring 27 that prevents effects on other elements formed on the same semiconductor substrate, and the guardring connects to the ground potential point GND. By this structure, a load current in an inverse direction can be flown by a parasitic diode of the switching transistor that is provided on the side of a ground and is in an off state. Also, the operation of a parasitic diode Tr generated in this instance is restrained and the power loss is reduced.
    Type: Application
    Filed: June 25, 2002
    Publication date: November 7, 2002
    Applicant: ROHM CO., LTD.
    Inventor: Seiichi Yamamoto
  • Patent number: 6441654
    Abstract: An inductive load driving circuit, formed in an integrated circuit device, includes first, second, third, and fourth switching transistors, and a guardring. The first switching transistor is connected between a first power supply potential point and a first output terminal. The second switching transistor is connected between the first power supply potential point and a second output terminal. The third switching transistor is connected between the first output terminal and a second power supply potential point. The fourth switching transistor is connected between the second output terminal and the second power supply potential point. One of the third switching transistor and the fourth switching transistor is turned on or off depending on a power supply direction in which power is supplied to an inductive load connected between the first output terminal and the second output terminal.
    Type: Grant
    Filed: September 6, 2000
    Date of Patent: August 27, 2002
    Assignee: Rohm Co., Ltd.
    Inventor: Seiichi Yamamoto
  • Patent number: 6437402
    Abstract: A power MOS transistor including a multiplicity of MOS transistor cells in first and a second power MOS block. The first power MOS block includes a first half of the MOS transistor cells and is equipped with a first set of source leads and drain leads for connecting in parallel the first half of the MOS transistor cells. The second power MOS block includes a second half of the MOS transistor cells and is equipped with a second set of source leads and drain leads for connecting in parallel the second half of the MOS transistor cells. The first set of source leads protrude along one direction of the first power MOS block and form a first source protruding section. The first set of drain leads protrude along an opposite direction of the first power MOS block and form a first drain protruding section. The second set of source leads protrude along one direction of the second power MOS block and form a second source protruding section.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: August 20, 2002
    Assignee: Rohm Co., Ltd.
    Inventor: Seiichi Yamamoto
  • Publication number: 20020080931
    Abstract: When adding a new function to a key telephone unit BT, a function addition request is transmitted from a user PC of an user system CM to a customer center CC. The function addition request includes information indicative of the function to be added, a credit number, and a telephone number of the key telephone unit. The customer center CC accesses a credit company CR based on the received credit number, carries out credit research of a user. The customer center CC accesses the key telephone unit BT through a public network PNW based on the telephone number, acquires function information of the key telephone unit BT, judges whether the function can be added based on the function information. If addition is possible, the customer center CC transmits a license code of the function to the key telephone unit BT through the public network PNW, thereby setting the function.
    Type: Application
    Filed: February 20, 2002
    Publication date: June 27, 2002
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Seiichi Yamamoto, Yoshimitsu Ebisawa, Yasumasa Sasaki, Emi Senga, Yoshihiro Kawauchi, Takaaki Hoshikawa, Tooru Iida, Yasuo Funato