Patents by Inventor Keisuke Kigawa
Keisuke Kigawa 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).
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Patent number: 8558435Abstract: A piezoelectric device has a piezoelectric vibration element mounted in a package wherein the piezoelectric vibration element comprises two stick-like vibration legs; a central leg provided between the two vibration legs; a coupling portion that couples one end of each of the two vibration legs and one end of the central leg; and a protrusion portion that is coupled to another end of the central leg, has a predetermined angle, neither 0 nor 180 degrees, to the length direction of the central leg, and extends into a direction not interfering with the driving legs. In making the piezoelectric device smaller and thinner, this configuration avoids interference between a support point on the central leg, provided for supporting the vibration element, and conductive electrodes, improves insulation between the conductive electrodes, and reduces the generation of short-circuits between the conductive electrodes.Type: GrantFiled: March 17, 2009Date of Patent: October 15, 2013Assignee: Citizen Holdings Co., Ltd.Inventors: Kazuo Murata, Kazuhiro Toriumi, Toshiya Kubo, Takashi Maruyama, Tomoyuki Nakazawa, Taichi Tsuchiya, Izumi Yamamoto, Akiko Katoh, Sadao Horiuchi, Hiroshi Miyauchi, Isao Arai, Akihiro Shioji, Tomoo Ikeda, Maki Takizawa, Keisuke Kigawa
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Patent number: 7902481Abstract: A method of manufacturing a sealed electronic component, which can seal a housing in a high-vacuum state while preventing enclosure of a gas within the housing, as well as achieving the improvement in manufacturing efficiency. According to the method, after forming an unwelded section by a primary welding process step, including a first beam irradiation process step and a second beam irradiation process step, annealing treatment is performed in an annealing process step by irradiating an electron beam to a predetermined portion on a locus of the electron beam formed in the first beam irradiation process step. The locus may be on a housing or a lid.Type: GrantFiled: March 30, 2005Date of Patent: March 8, 2011Assignees: Citizen Holdings Co., Ltd, Citizen Finetech Miyota Co., LtdInventors: Keisuke Kigawa, Haruyuki Hiratsuka, Tomohisa Wada
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Publication number: 20110018399Abstract: A piezoelectric device has a piezoelectric vibration element mounted in a package wherein the piezoelectric vibration element comprises two stick-like vibration legs; a central leg provided between the two vibration legs; a coupling portion that couples one end of each of the two vibration legs and one end of the central leg; and a protrusion portion that is coupled to another end of the central leg, has a predetermined angle, neither 0 nor 180 degrees, to the length direction of the central leg, and extends into a direction not interfering with the driving legs. In making the piezoelectric device smaller and thinner, this configuration avoids interference between a support point on the central leg, provided for supporting the vibration element, and conductive electrodes, improves insulation between the conductive electrodes, and reduces the generation of short-circuits between the conductive electrodes.Type: ApplicationFiled: March 17, 2009Publication date: January 27, 2011Applicant: CITIZEN HOLDINGS CO., LTD.Inventors: Kazuo Murata, Kazuhiro Toriumi, Toshiya Kubo, Takashi Maruyama, Tomoyuki Nakazawa, Taichi Tsuchiya, Izumi Yamamoto, Akiko Katoh, Sadao Horiuchi, Hiroshi Miyauchi, Isao Arai, Akihiro Shioji, Tomoo Ikeda, Maki Takizawa, Keisuke Kigawa
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Patent number: 7557491Abstract: The present invention is to prevent melted sealant from flowing into the interior of a case of an electronic component package that is provided with a shielding electrode on the inner surface of the case, fill a through-hole with the sealant with reliability, and perform vacuum airtight sealing. The electronic component package 10 has a case 12 that has an opening and stores an electronic component (piezoelectric oscillator 11) in the storage inside, and a lid 16 that is joined to the rim of the opening to cover the opening, and airtightly seals a through-hole 20 provided on the bottom part 12b of the case 12 to communicate with the outside, by using a sealant 30.Type: GrantFiled: February 5, 2007Date of Patent: July 7, 2009Assignee: Citizen Holdings Co., Ltd.Inventors: Keisuke Kigawa, Mitsumasa Sakurai
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Publication number: 20070199925Abstract: After forming an unwelded section by a primary welding process step (S203) including a first beam irradiation process step (S203a) and a second beam irradiation process step (S203b), annealing treatment is performed in an annealing process step (S204) by irradiating an electron beam to a predetermined portion on a locus of the electron beam formed in the first beam irradiation process step (S203a). Thereby, there is provided a manufacturing method of a sealed electronic component, which can seal a housing in a high-vacuum state while preventing enclosure of a gas within the housing, as well as achieving the improvement in manufacturing efficiency.Type: ApplicationFiled: March 30, 2005Publication date: August 30, 2007Inventors: Keisuke Kigawa, Haruyuki Hiratsuka, Tomohisa Wada
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Publication number: 20070182289Abstract: The present invention is to prevent melted sealant from flowing into the interior of a case of an electronic component package that is provided with a shielding electrode on the inner surface of the case, fill a through-hole with the sealant with reliability, and perform vacuum airtight sealing. The electronic component package 10 has a case 12 that has an opening and stores an electronic component (piezoelectric oscillator 11) in the storage inside, and a lid 16 that is joined to the rim of the opening to cover the opening, and airtightly seals a through-hole 20 provided on the bottom part 12b of the case 12 to communicate with the outside, by using a sealant 30.Type: ApplicationFiled: February 5, 2007Publication date: August 9, 2007Applicant: CITIZEN WATCH CO., LTD.Inventors: Keisuke Kigawa, Mitsumasa Sakurai
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Patent number: 7138473Abstract: A miniature portable equipment in the present invention comprising a packing comprising a butyl rubber having a crosslinking structure composed of carbon to carbon bonds of the formula:Type: GrantFiled: June 29, 2001Date of Patent: November 21, 2006Assignee: Citizen Watch Co., Ltd.Inventors: Keisuke Kigawa, Takayuki Waseda
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Publication number: 20030102639Abstract: A miniature portable equipment in the present invention comprising a packing comprising a butyl rubber having a crosslinking structure composed of carbon to carbon bonds of the formula: 1Type: ApplicationFiled: November 15, 2002Publication date: June 5, 2003Inventors: Keisuke Kigawa, Takayuki Waseda
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Publication number: 20020036673Abstract: An ink jet head, for use in an ink jet recording apparatus, comprising an ink chamber, a member constituting the ink chamber being made of a plastic material having a surface possessing a hydrophilic nature imparted by surface treatment, for introducing a polar group, selected from the group consisting of acid treatment, ultraviolet light-ozone irradiation, and oxygen plasma treatment, and a process for producing the same. When the ink jet head is used in an ink jet printer using a water-base ink, the wettability of an ink flow passage within the head is good and, in addition, the good wettability can be stably maintained, permitting a high print quality to be ensured for a long period of time.Type: ApplicationFiled: June 11, 1997Publication date: March 28, 2002Applicant: Citizen Watch Co., LTDInventors: KOZO MIYOSHI, AYAKO KAZAMA, KEISUKE KIGAWA, YORINOBU YAMADA
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Patent number: 6287475Abstract: When forming a floating-type magnetic head slider for a hard disk drive or the like using dry etching, a method for manufacturing the magnetic head slider provides a method for adhering the slider being processed to an appropriate processing fixture, and when a plurality of magnetic head sliders are being processed at one time, a row (bar) array of sliders that is prepared beforehand is adhered to a metal or ceramic base, after which a dry etching method is used to form the air bearing, dry film photo-resist being used for the adhering of the row and the base. Ion milling or reactive ion etching (RIE) can be used as the dry etching method.Type: GrantFiled: May 26, 1998Date of Patent: September 11, 2001Assignee: Citizen Watch Co., Ltd.Inventors: Nobuto Fukushima, Keisuke Kigawa
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Patent number: 5719606Abstract: An ink jet head of an ink jet printer of a drop-on-demand type achieves mounting or connection between a driving electrode and an external electrode easily and surely and at the same time reduces revolution of a piezoelectric material during driving. Between the driving electrode with an insulating film and the external electrode is provided an electrical joining component containing electroconductive particles that are harder than the insulating film and that have a particle diameter larger than the thickness of the insulating film. At the bottom part of a slot in a piezoelectric material that forms an ink chamber and pressure chamber is provided a concave portion having a shape formed of combined at least two lines or surfaces. A part of a surface causing a revolution is converted to a component causing a shearing mode.Type: GrantFiled: February 28, 1995Date of Patent: February 17, 1998Assignee: Citizen Watch Co., Ltd.Inventors: Keisuke Kigawa, Tomoo Ikeda, Masayasu Uga, Yoshiyuki Nagashima, Hisato Hiraishi
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Patent number: 5359354Abstract: An ink jet head is disclosed for use with a drop-on demand type printer, and includes an insulating base, a plurality of elongated barriers projecting upwardly from the base so as to form a plurality of slots between the barriers, a plurality of nozzle holes communicating with the slots, and electrodes formed on the side walls of the elongated barriers. Voltage can be applied to the various barriers through the electrodes in order to cause deflection of the barriers and a corresponding reduction in the cross-sectional area of selected slots, so as to force ink contained in the slots to be jetted through the nozzle holes. In order to provide a uniform ink jet intensity from the outermost slots relative to the inner slots, dummy slots can be formed outwardly of the outermost active slots by providing dummy barriers outwardly of the outermost active barriers. In addition, the nozzle holes are formed in a nozzle plate. The nozzle plate can either be mounted against the ends of the slots, or atop the base.Type: GrantFiled: November 12, 1991Date of Patent: October 25, 1994Assignee: Citizen Watch Co., Ltd.Inventors: Hisato Hiraishi, Fumio Maeno, Motonobu Hoshino, Yoshihiko Yanagawa, Keisuke Kigawa