Patents by Inventor Yasutaka Shimizu
Yasutaka Shimizu 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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Publication number: 20150132033Abstract: A toner carrier includes a metal core, a barrel formed on an outer circumference of the metal core and including at least an elastic layer, and a coating formed on outer circumferences of both ends of the barrel. The coating has a thickness and a width of an outer circumference of the coating is different from a width of an inner circumference of the coating. The width is from an end surface of the barrel along an axis of the barrel, and the width of the outer circumference is larger than the width of the inner circumference so that the end surface of the coating is reversely inclined.Type: ApplicationFiled: January 21, 2015Publication date: May 14, 2015Applicant: RICOH COMPANY, LTD.Inventors: Hiroya Abe, Masaki Watanabe, Yasutaka Shimizu
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Patent number: 8971754Abstract: A toner carrier includes a metal core, a barrel formed on an outer circumference of the metal core and including at least an elastic layer, and a coating formed on outer circumferences of both ends of the barrel. The coating has a thickness and a width of an outer circumference of the coating is different from a width of an inner circumference of the coating. The width is from an end surface of the barrel along an axis of the barrel, and the width of the outer circumference is larger than the width of the inner circumference so that the end surface of the coating is reversely inclined.Type: GrantFiled: January 9, 2014Date of Patent: March 3, 2015Assignee: Ricoh Company, Ltd.Inventors: Hiroya Abe, Masaki Watanabe, Yasutaka Shimizu
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Publication number: 20140345149Abstract: A chainsaw having improved cutting workability is provided. A chainsaw is used to cut an object to be worked by a saw chain. A chainsaw main body is provided with an electric motor and a sprocket, and a guide bar around which the saw chain is wound is provided on the chainsaw main body. The guide bar is attached to the chainsaw main body by a screw member serving as an attaching member. A load sensor detects whether or not the guide bar is attached to the chainsaw main body. Rotation of the saw chain is prohibited based upon a signal from the load sensor when the guide bar is not attached to the chainsaw main body.Type: ApplicationFiled: December 25, 2012Publication date: November 27, 2014Inventors: Yasuo Etou, Satoru Matsuno, Kouji Sagawa, Miyoji Onose, Yasutaka Shimizu, Ai Nakayama
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Publication number: 20140199098Abstract: A toner carrier includes a metal core, a barrel formed on an outer circumference of the metal core and including at least an elastic layer, and a coating formed on outer circumferences of both ends of the barrel. The coating has a thickness and a width of an outer circumference of the coating is different from a width of an inner circumference of the coating. The width is from an end surface of the barrel along an axis of the barrel, and the width of the outer circumference is larger than the width of the inner circumference so that the end surface of the coating is reversely inclined.Type: ApplicationFiled: January 9, 2014Publication date: July 17, 2014Applicant: RICOH COMPANY, LTD.Inventors: Hiroya Abe, Masaki Watanabe, Yasutaka Shimizu
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Publication number: 20140116737Abstract: A casing of a hedge clipper which is a portable tool is provided with a power source housing in which an electric motor is housed and a main handle held by a worker, and blades serving as a tip tool are provided to the casing. An operation display panel is provided on the main handle, and a driving information display unit which displays a battery remaining capacity and a rotation speed of an electric motor as a plurality of pieces of driving information is provided on the operation display panel. The selection of the information to be displayed is switched by the operation of an operation switch unit provided in the operation display panel.Type: ApplicationFiled: October 31, 2013Publication date: May 1, 2014Applicant: Hitachi Koki Co., Ltd.Inventors: Kazutaka IWATA, Yasutaka SHIMIZU, Shogo SHIBATA
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Publication number: 20140047719Abstract: In a hedge trimmer, a main body is configured of: a main body front portion on a front side (a side on which the cutting blade protrudes); a main body rear portion on a rear side; and a supporting portion for connecting them on a lower side. One end of a main handle and the other end of the same are connected to an upper portion of the main body front portion on the rear end side and an upper portion of the main body rear portion on the front end side. The main handle has a linear shape in parallel to a longitudinal direction of a cutting blade. In this configuration, the main handle is set in substantially parallel to the supporting portion, and a grip space is formed between the main handle and the supporting portion.Type: ApplicationFiled: August 20, 2013Publication date: February 20, 2014Applicant: HITACHI KOKI CO., LTD.Inventors: Yasutaka SHIMIZU, Shogo SHIBATA, Seiichi KODATO, Kouji SAGAWA, Shingo KOSUGI
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Patent number: 7755395Abstract: An inverter circuit for generating an output signal at an output node obtained by inverting an input signal level at an input node includes a common-source MOS transistor having a gate node connected to the input node, a source connected to a predetermined voltage and a substrate gate, a load resistor connected in series with the MOS transistor, and a resistor connected between the gate node and the substrate gate of the MOS transistor.Type: GrantFiled: June 26, 2009Date of Patent: July 13, 2010Assignee: Ricoh Company, Ltd.Inventors: Kohji Yoshii, Yasutaka Shimizu
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Publication number: 20100013519Abstract: An inverter circuit for generating an output signal at an output node obtained by inverting an input signal level at an input node includes a common-source MOS transistor having a gate node connected to the input node, a source connected to a predetermined voltage-and a substrate gate, a load resistor connected in series with the MOS transistor, and a resistor connected between the gate node and the substrate gate of the MOS transistor.Type: ApplicationFiled: June 26, 2009Publication date: January 21, 2010Applicant: RICOH COMPANY, LTD.Inventors: Kohji YOSHII, Yasutaka SHIMIZU
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Patent number: 6037699Abstract: The invention provides a surface acoustic wave device which has a thin film formed on a surface of a substrate adapted to excite longitudinal wave-type surface acoustic waves, longitudinal wave-type quasi surface acoustic waves or longitudinal wave-type surface skimming bulk waves to thereby give an increased electromechanical coupling coefficient and at the same time minimize the temperature coefficient of delay time. For example, in a surface acoustic wave device having an aluminum thin film formed on a surface of a lithium tantalate substrate, the direction of propagation of longitudinal wave-type quasi surface acoustic waves is (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles and within a range equivalent thereto, and the product of wave number of longitudinal wave-type quasi surface acoustic waves and the thickness of the thin film is at least 1.0, preferably in the range of 1.3 to 2.0. The device provided exhibits higher performance than in the paior art.Type: GrantFiled: January 9, 1998Date of Patent: March 14, 2000Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: 5854527Abstract: The surface acoustic wave device of the invention comprises a piezoelectric substrate of lithium niobate or lithium tantalate and electrodes formed on the substrate for propagating surface acoustic waves. The substrate has a cut plane and a surface acoustic wave propagation direction which are (.phi., .theta., .psi.) as expressed in Eulerian angles and within ranges substantially equivalent thereto. When the substrate is made of lithium niobate, .phi., .theta. and .psi. are 0.degree.-86.degree. or 95.degree.-180.degree., 73.degree.-118.degree. and 0.degree.-44.degree., respectively. When the substrate is made of lithium tantalate, .phi., .theta. and .psi. are 0.degree.-87.degree. or 91.degree.-180.degree., 80.degree.-120.degree. and 0.degree.-44.degree., respectively. This enables the device to exhibit high performance.Type: GrantFiled: March 6, 1997Date of Patent: December 29, 1998Assignee: Sanyo Electric Co., Ltd.Inventors: Yasutaka Shimizu, Atsuhiro Nishikata, Shigetaka Tonami
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Patent number: 5760522Abstract: The invention provides a surface acoustic wave device which has a thin film formed on a surface of a substrate adapted to excite longitudinal wave-type surface acoustic waves, longitudinal wave-type quasi surface acoustic waves or longitudinal wave-type surface skimming bulk waves to thereby give an increased electromechanical coupling coefficient and at the same time minimize the temperature coefficient of delay time. For example, in a surface acoustic wave device having an aluminum thin film formed on a surface of a lithium tantalate substrate, the direction of propagation of longitudinal wave-type quasi surface acoustic waves is (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles and within a range equivalent thereto, and the product of wave number of longitudinal wave-type quasi surface acoustic waves and the thickness of the thin film is at least 1.0, preferably in the range of 1.3 to 2.0. The device provided exhibits higher performance than in the paior art.Type: GrantFiled: April 9, 1996Date of Patent: June 2, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Yasumi Kobayashi, Kuniyuki Matsui, Yasuhiro Hirao, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: 5719537Abstract: In a resonator-type surface acoustic wave filter comprising a lithium tantalate substrate, lithium niobate substrate or lithium tetraborate substrate having a cut plane of high velocity, the direction of propagation of surface acoustic waves is set within the range of (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles, and the frequency difference .increment.f between the resonance frequency frs of series resonators and the resonance frequency frp of parallel resonators is set within a predetermined range formulated with the center frequency, the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators taken as parameters. Optimum ranges of the required design parameters are thus clarified to assure the resonator-type surface acoustic wave filter of higher performance.Type: GrantFiled: April 9, 1996Date of Patent: February 17, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kosuke Takeuchi, Kenichi Shibata, Masami Ikeda, Toshiharu Tanaka, Yasutaka Shimizu
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Patent number: 5719536Abstract: In a resonator-type surface acoustic wave filter comprising a lithium tantalate substrate, lithium niobate substrate or lithium tetraborate substrate having a cut plane of high velocity, the direction of propagation of surface acoustic waves is set within the range of (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles, and the capacitance Cos of the series resonators and the capacitance Cop of the parallel resonators are set within a predetermined range formulated with the center frequency taken as a parameter. Optimum ranges of the required design parameters are thus clarified to assure the resonator-type surface acoustic wave filter of higher performance.Type: GrantFiled: April 9, 1996Date of Patent: February 17, 1998Assignees: Sanyo Electric Co., Ltd., Yasutaka ShimizuInventors: Kuniyuki Matsui, Yasuhiro Hirao, Yasumi Kobayashi, Kosuke Takeuchi, Kenichi Shibata, Yusuke Takahashi, Tateo Kondo, Yasutaka Shimizu
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Patent number: D585716Type: GrantFiled: March 25, 2008Date of Patent: February 3, 2009Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Taniguchi, Hitoshi Tsuzuki, Tomoyuki Kawahara, Yasutaka Shimizu
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Patent number: D650643Type: GrantFiled: December 3, 2010Date of Patent: December 20, 2011Assignee: Hitachi Koki Co., Ltd.Inventors: Yoshiki Aoki, Hiroyuki Hasegawa, Yasutaka Shimizu
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Patent number: D706591Type: GrantFiled: February 8, 2013Date of Patent: June 10, 2014Assignee: Hitachi Koki Co., Ltd.Inventors: Shingo Kosugi, Rui Akiba, Yasutaka Shimizu