Patents by Inventor Takashi Majima
Takashi Majima 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: 8578618Abstract: According to the present invention, a three-dimensional measuring instrument includes a spindle that moves an object to be controlled in a predetermined axis direction; and a controlling device that controls a position of the object to be controlled by controlling a position of the spindle. The three-dimensional measuring instrument further includes an absolute-type linear encoder that outputs an absolute position of the spindle. With this, it is possible to start measurement by the three-dimensional measuring instrument in a short period of time.Type: GrantFiled: July 11, 2011Date of Patent: November 12, 2013Assignee: Mitutoyo CorporationInventors: Takashi Majima, Hideki Kumagai, Kazumi Mizukami, Tomohiro Usui
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Patent number: 8358578Abstract: A redundant communication system includes a first control device which calculates a control command value of an electric power device, and outputs first and second command signals; a second control device which controls the electric power device on the basis of one of the first and second control command values; and primary and secondary communication lines for respectively transmitting the first and second command signals to the second control device. The second control device comprises: a primary communication line abnormality determining unit which determines that the primary communication line is abnormal when a non-reception state or an abnormality state of the first command signal continues during a predetermined period; and a control command value switching unit which selects one of the first and second control command values in a switching manner and switches the selection from the first to the second control command value within the predetermined period.Type: GrantFiled: December 25, 2008Date of Patent: January 22, 2013Assignees: Honda Motor Co., Ltd., IHI CorporationInventors: Seigo Murashige, Hiroyuki Abe, Junichi Kobayashi, Takashi Majima, Yuji Sasaki
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Publication number: 20120023765Abstract: According to the present invention, a three-dimensional measuring instrument includes a spindle that moves an object to be controlled in a predetermined axis direction; and a controlling device that controls a position of the object to be controlled by controlling a position of the spindle. The three-dimensional measuring instrument further includes an absolute-type linear encoder that outputs an absolute position of the spindle. With this, it is possible to start measurement by the three-dimensional measuring instrument in a short period of time.Type: ApplicationFiled: July 11, 2011Publication date: February 2, 2012Applicant: MITUTOYO CORPORATIONInventors: Takashi MAJIMA, Hideki KUMAGAI, Kazumi MIZUKAMI, Tomohiro USUI
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Publication number: 20100280634Abstract: A redundant communication system includes: a first control device which calculates a control command value of an electric power device equipped in a vehicle, and outputs first and second command signals respectively corresponding to the control command value; a second control device which controls the electric power device on the basis of one of first and second control command values respectively corresponding to the first and the second command signals received from the first control device; a primary communication line which transmits the first command signal from the first control device to the second control device; and a secondary communication line which transmits the second command signal from the first control device to the second control device, wherein the second control device comprises: a primary communication line abnormality determining unit which determines that the primary communication line is abnormal, when a non-reception state of the first command signal or an abnormality state of the firType: ApplicationFiled: December 25, 2008Publication date: November 4, 2010Applicants: HONDA MOTOR CO., LTD., IHI CORPORATIONInventors: Seigo Murashige, Hiroyuki Abe, Junichi Kobayashi, Takashi Majima, Yuji Sasaki
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Patent number: 7567046Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.Type: GrantFiled: October 19, 2005Date of Patent: July 28, 2009Assignee: IHI CorporationInventors: Narifumi Tojima, Takashi Majima, Mitsunao Sakamoto, Tetsuya Fukumoto
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Publication number: 20080089675Abstract: An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.Type: ApplicationFiled: October 19, 2005Publication date: April 17, 2008Inventors: Narifumi Tojima, Takashi Majima, Mitsunao Sakamoto, Tetsuya Fukumoto
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Patent number: 6781496Abstract: A primary winding 12 connected to a high-voltage, a large-current power supply 1, a secondary winding 14 connected to an electromagnetic forming coil 2, and a magnetic core 16 for guiding the magnetic flux produced by the primary winding. The magnetic core 16 is composed of a primary core 16a on which the primary winding is wound and a secondary core 16b on which the secondary winding is wound. The primary core and the secondary core are magnetically connected in contact or in close proximity. The primary core and the secondary core are separated each other when the connector is disconnected. Thus, current pulses at a high voltage (for instance, 10 kV) with a large current (for example, 100 kA or more) and a narrow pulse width (e.g., 30 &mgr;sec or less) can be efficiently transmitted, and the connector easily attached and removed.Type: GrantFiled: February 19, 2002Date of Patent: August 24, 2004Assignee: Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Yasuo Kobayashi, Takashi Majima, Yuuji Sasaki
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Publication number: 20020171525Abstract: The major components are a primary winding 12 connected to a high-voltage, a large-current power supply 1, a secondary winding 14 connected to an electromagnetic forming coil 2, and a magnetic core 16 for guiding the magnetic flux produced by the primary winding. The magnetic core 16 is composed of a primary core 16a on which the primary winding is wound and a secondary core 16b on which the secondary winding is wound. The primary core and the secondary core are magnetically connected together by putting them in contact or in close proximity. And the primary core and the secondary core are separeated each other when the connector is disconnected. Thus, current pulses at a high voltage (for instance, 10 kV) with a large current (for example, 100 kA or more) and a narrow pulse width (e.g., 30 &mgr;sec or less) can be efficiently transmitted, and the connector can be easily attached and removed.Type: ApplicationFiled: February 19, 2002Publication date: November 21, 2002Applicant: Ishikawajima-Harima HeavyInventors: Yasuo Kobayashi, Takashi Majima, Yuuji Sasaki
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Patent number: 4952087Abstract: In a printer for use with a continuous form, a tractor drive shaft and a tractor guide shaft are mounted to a tractor frame of a bi-directional form feeder unit in parallel relation to each other. A pair of tractors mounted on both the shafts are movable therealong, but can be fixed to a shaft body of the guide shaft at respective desired positions. Opposite axial ends of the drive shaft are received respectively in a pair of elongated slots whose longitudinal axes extend substantially perpendicularly to a platen. One axial end of the drive shaft is drivingly connected to a drive unit. A pair of support shaft sections extend respectively from opposite axial end faces of the shaft body and are supported by the tractor frame. An axis of the shaft body extends in eccentric relation to an axis common to the support shaft sections. The shaft body is angularly movable about its axis relatively to the tractors.Type: GrantFiled: December 7, 1988Date of Patent: August 28, 1990Assignee: Citizen Watch Co., Ltd.Inventors: Yasuo Iwata, Michio Koizumi, Kimihiro Kosugi, Kouzou Abe, Takashi Majima