Patents by Inventor Toshiro Tojo
Toshiro Tojo 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).
-
Patent number: 10968956Abstract: Provided is a diagnosis method of appropriately recognizing a state of a rolling surface of a track member of a rolling guide device or a lubrication state of rolling elements using a sensor mounted to the rolling guide device. The diagnosis method is applied to a rolling guide device including: a track member having a rolling surface extending along a longitudinal direction of the track member; and a moving member, which is assembled to the track member through intermediation of a plurality of rolling elements configured to roll on the rolling surface so that the moving member is movable along the track member, and has an endless circulation path for the rolling elements.Type: GrantFiled: March 8, 2017Date of Patent: April 6, 2021Assignee: THK CO., LTD.Inventors: Kaoru Hoshide, Toshiro Tojo, Yoshiyuki Honjo, Ryuji Furusawa, Ayako Miyajima
-
Patent number: 10371202Abstract: Provided is a rolling guide device which is capable of directly recognizing an operation condition of a moving member with respect to a track member or a circulation state of rolling elements in an endless circulation path, the rolling guide device including: a track member having a rolling surface; and a moving member, which is assembled to the track member through intermediation of a large number of rolling elements which roll on the rolling surface, and has an endless circulation path for the rolling elements, the moving member including: a main body member having a load rolling surface and a no-load return path for the rolling elements, the load rolling surface being opposed to the rolling surface of the track member to define a load path for the rolling elements, a pair of covers, which have direction change paths for allowing the rolling elements to move between the load path and the no-load return path, and is mounted to the main body member; and a measurement plate, which is interposed at least betweeType: GrantFiled: January 11, 2017Date of Patent: August 6, 2019Assignee: THK CO., LTD.Inventors: Kaoru Hoshide, Toshiro Tojo, Yoshiyuki Honjo, Ryuji Furusawa, Ayako Miyajima
-
Publication number: 20190128330Abstract: Provided is a diagnosis method of appropriately recognizing a state of a rolling surface of a track member of a rolling guide device or a lubrication state of rolling elements using a sensor mounted to the rolling guide device. The diagnosis method is applied to a rolling guide device including: a track member having a rolling surface extending along a longitudinal direction of the track member; and a moving member, which is assembled to the track member through intermediation of a plurality of rolling elements configured to roll on the rolling surface so that the moving member is movable along the track member, and has an endless circulation path for the rolling elements.Type: ApplicationFiled: March 8, 2017Publication date: May 2, 2019Applicant: THK CO., LTD.Inventors: Kaoru Hoshide, Toshiro Tojo, Yoshiyuki Honjo, Ryuji Furusawa, Ayako Miyajima
-
Publication number: 20190024713Abstract: Provided is a rolling guide device which is capable of directly recognizing an operation condition of a moving member with respect to a track member or a circulation state of rolling elements in an endless circulation path, the rolling guide device including: a track member having a rolling surface; and a moving member, which is assembled to the track member through intermediation of a large number of rolling elements which roll on the rolling surface, and has an endless circulation path for the rolling elements, the moving member including: a main body member having a load rolling surface and a no-load return path for the rolling elements, the load rolling surface being opposed to the rolling surface of the track member to define a load path for the rolling elements, a pair of covers, which have direction change paths for allowing the rolling elements to move between the load path and the no-load return path, and is mounted to the main body member; and a measurement plate, which is interposed at least betweeType: ApplicationFiled: January 11, 2017Publication date: January 24, 2019Applicant: THK CO., LTD.Inventors: Kaoru Hoshide, Toshiro Tojo, Yoshiyuki Honjo, Ryuji Furusawa, Ayako Miyajima
-
Patent number: 8872449Abstract: A distributed-arrangement linear motor in which stators are arranged in a distributed manner and a method of controlling the distributed-arrangement linear motor are provided. The linear motor 1 is a linear motor in which a stator and a movable member are relatively movable, wherein the stator and the movable member respectively have periodic structures in which plural kinds of poles of the stator and the movable member (12a, 12b, 12c) (22a, 22b, 22c) which magnetically act each other and arranged periodically subsequently in an order according to the arrangement in a direction of the relative motion therebetween; a plurality of stators are arranged in a distributed manner in the direction of the relative motion; a distance D1, D2 between adjacent stators is not more than a length Lmv of the movable member; the pole of the stator is formed of a coil 11; and a current control unit that controls current to be supplied to the coil based on the distance between the stators is provided.Type: GrantFiled: August 5, 2010Date of Patent: October 28, 2014Assignee: THK Co., Ltd.Inventors: Toshiro Tojo, Toshiyuki Aso, Yuki Nomura, Akihiro Unno
-
Patent number: 8362720Abstract: A position detection system includes a linear motor having a rod in which magnetic poles of N pole and S pole are arranged alternately in an axial direction and a plurality of coils surrounding the rod a magnetic sensor for detecting change in the direction of the magnetic field of the rod caused by linear movement of the rod relative to the coils to output a sine wave signal and a cosine wave signal which are 90° phase shifted with respect to one another, and a position detecting circuit for detecting a position of the rod relative to the coils. As the magnetic sensor detects the change in the direction of the magnetic field of the rod, the sine wave signal and the cosine wave signal output from the magnetic sensor hardly vary even when the distance between the rod and the magnetic sensor is changed.Type: GrantFiled: May 30, 2008Date of Patent: January 29, 2013Assignee: THK Co., Ltd.Inventors: Toshiyuki Aso, Shuhei Yamanaka, Toshiro Tojo
-
Patent number: 8217538Abstract: A linear motor is provided with a stator, a slider disposed to be movable relatively with respect to the stator with a gap, and a non-magnetic plate mounted to either one of the stator and the slider so as to define the gap between the stator and the slider.Type: GrantFiled: December 28, 2009Date of Patent: July 10, 2012Assignee: THK Co., Ltd.Inventors: Kazuo Shoda, Toshiro Tojo, Yuki Nomura, Akihiro Unno
-
Publication number: 20120139455Abstract: A distributed-arrangement linear motor in which stators are arranged in a distributed manner and a method of controlling the distributed-arrangement linear motor are provided. The linear motor 1 is a linear motor in which a stator and a movable member are relatively movable, wherein the stator and the movable member respectively have periodic structures in which plural kinds of poles of the stator and the movable member (12a, 12b, 12c) (22a, 22b, 22c) which magnetically act each other and arranged periodically subsequently in an order according to the arrangement in a direction of the relative motion therebetween; a plurality of stators are arranged in a distributed manner in the direction of the relative motion; a distance D1, D2 between adjacent stators is not more than a length Lmv of the movable member; the pole of the stator is formed of a coil 11; and a current control unit that controls current to be supplied to the coil based on the distance between the stators is provided.Type: ApplicationFiled: August 5, 2010Publication date: June 7, 2012Applicant: THK CO., LTD.Inventors: Toshiro Tojo, Toshiyuki Aso, Yuki Nomura, Akihiro Unno
-
Publication number: 20100171459Abstract: Provided is a position detection system which is inexpensive and does not need to control the accuracy of mounting a sensor strictly. The position detection system according to the present invention includes; a linear motor having a rod 1 in which magnetic poles of N pole and S pole are arranged alternately in an axial direction and a plurality of coils 4 surrounding the rod 1; a magnetic sensor 12 for detecting change in the direction of the magnetic field of the rod 1 caused by linear movement of the rod 1 relative to the coils 4 to output a sine wave signal and a cosine wave signal which are 90° phase shifted to each other; and a position detecting circuit 13 for detecting a position of the rod 1 relative to the coils 4. As the magnetic sensor 12 detects the change in the direction of the magnetic field of the rod 1, the sine wave signal and the cosine wave signal output from the magnetic sensor 12 hardly vary eve when the distance between the rod 1 and the magnetic sensor is changed.Type: ApplicationFiled: May 30, 2008Publication date: July 8, 2010Applicant: THK CO., LTD.Inventors: Toshiyuki Aso, Shuhei Yamanaka, Toshiro Tojo
-
Publication number: 20100164306Abstract: A linear motor is provided with a stator, a slider disposed to be movable relatively with respect to the stator with a gap, and a non-magnetic plate mounted to either one of the stator and the slider so as to define the gap between the stator and the slider.Type: ApplicationFiled: December 28, 2009Publication date: July 1, 2010Applicant: THK CO., LTDInventors: Kazuo SHODA, Toshiro Tojo, Yuki Nomura, Akihiro Unno
-
Publication number: 20060208849Abstract: A signal level switching circuit is provided with input resistors 2a and 2b connected between input terminals 1a and 1b of a signal and output terminals 5a and 5b used to be connected to a reception circuit 6; a switch circuit 3 which has been constituted by a plurality of switching elements and has been connected to the output terminals 5a and 5b; and a voltage dividing resistor 4 for selectively switching/connecting with respect to the input resistors 2a and 2b by this switch circuit 3.Type: ApplicationFiled: March 11, 2004Publication date: September 21, 2006Inventors: Toshiro Tojo, Takashi Kaku, Tooru Ogawa
-
Patent number: 7019611Abstract: A modem coupling circuit comprising: (a) a transformer 1 having a core 1a including a gap formed therein, primary windings N1a, N1b constituting a bifilar wound coil which is wound around the core 1a, forming a single layer and connected to power lines L1, L2, and a secondary winding N2 connected to a transmitting circuit 2 and a secondary winding N3 connected to a receiving circuit 3, the secondary windings N2, N3 holding the single layer of the primary windings between; (b) a coupling capacitor C1 connected to a middle point between first ends of the primary windings, the first ends being not connected to the power lines L1, L2; (c) current limiting resistances R1a, R1b connected to the primary windings N1a, N1b having a bifilar construction; (d) drive resistances R2a, R2b connected to the secondary winding for transmission N2; and (e) terminating resistances R3a, R3b connected to the secondary winding for reception N3.Type: GrantFiled: March 18, 2004Date of Patent: March 28, 2006Assignees: Honda Electron Co., Ltd., NEC Tokin CorporationInventors: Takashi Kaku, Fumishiro Tsuda, Toshiro Tojo, Toyomi Obikawa, Toshiya Sato, Hideaki Yamauchi, Masahiko Kunii
-
Publication number: 20040263282Abstract: A modem coupling circuit comprising: (a) a transformer 1 having a core 1a including a gap formed therein, primary windings N1a, N1b constituting a bifilar wound coil which is wound around the core 1a, forming a single layer and connected to power lines L1, L2, and a secondary winding N2 connected to a transmitting circuit 2 and a secondary winding N3 connected to a receiving circuit 3, the secondary windings N2, N3 holding the single layer of the primary windings between; (b) a coupling capacitor C1 connected to a middle point between first ends of the primary windings, the first ends being not connected to the power lines L1, L2; (c) current limiting resistances R1a, R1b connected to the primary windings N1a, N1b having a bifilar construction; (d) drive resistances R2a, R2b connected to the secondary winding for transmission N2; and (e) terminating resistances R3a, R3b connected to the secondary winding for reception N3.Type: ApplicationFiled: March 18, 2004Publication date: December 30, 2004Inventors: Takashi Kaku, Fumishiro Tsuda, Toshiro Tojo, Toyomi Obikawa, Toshiya Sato, Hideaki Yamauchi, Masahiko Kunii
-
Publication number: 20040125860Abstract: A data transmission apparatus is provided that enables accurate data regeneration using an A/D converter with a relatively narrow dynamic range for processing a signal having a large noise amplitude. To this end, the data transmission apparatus includes a receiving part having a multiplier that performs a spread spectrum process by multiplying an input signal by a PN sequence, an A/D converter that performs an analog-to-digital conversion process on the signal that has undergone the spread spectrum process, and a multiplier that performs an inverse spread spectrum process by multiplying the signal that has undergone the analog-to-digital conversion process by the same PN sequence.Type: ApplicationFiled: July 23, 2003Publication date: July 1, 2004Inventors: Toshiro Tojo, Takashi Kaku
-
Patent number: 5128992Abstract: A hybrid circuit which converts receiving side four-wire signals from a switching network into two-wire signals, supplies the same through line B and line A to a telephone terminal equipment, and converts two-wire signals supplied from the telephone terminal equipment through the line A and the line B to the switching network into transmitting side four-wire signals, including a pair of battery feeding and terminating resistors connected between power sources (GND and V.sub.BB) and the line B and line A and a receiving side mirror circuit and transmitting side mirror circuit both connected between the lines B and A.Type: GrantFiled: August 9, 1990Date of Patent: July 7, 1992Assignee: Fujitsu LimitedInventors: Kenji Takato, Toshiro Tojo, Yuzo Yamamoto
-
Patent number: 5113426Abstract: In a ground fault detector for long distance subscriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter converts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is recovered by the maintenance person without breaking the resistor.Type: GrantFiled: September 19, 1990Date of Patent: May 12, 1992Assignee: Fujitsu LimitedInventors: Kazumi Kinoshita, Kenji Takato, Toshiro Tojo
-
Patent number: 4995111Abstract: An improved ring trip circuit for a subscriber telephone, for detecting an on-hook state or an off-hook state of the telephone. The ring trip circuit can be formed in a small size and can be formed by a LSI. The ring trip circuit includes a voltage detecting circuit (2), for detecting a voltage difference (.DELTA.V) between both ends of a ringer sending resistor, having a first circuit (S1, S2, A1.about.B3) converting the voltage difference to a current difference, and further having a second circuit (F) converting the current difference to a voltage, the voltage difference varying in response to the on-hook state or the off-hook state of the telephone, and a state detecting circuit (3) for detecting the on-hook state or the off-hook state in response to a value of the voltage from the voltage detecting circuit. The voltage detecting circuit is formed by a plurality of current mirror circuits, each of which includes at least two transistors.Type: GrantFiled: February 21, 1989Date of Patent: February 19, 1991Assignee: Fujitsu LimitedInventors: Toshiro Tojo, Kenji Takato, Kazumi Kinoshita, Yuzo Yamamoto, Yozo Iketani, Shin-ichi Ito
-
Patent number: 4935960Abstract: A battery feed circuit including a main battery feed part and its peripheral circuits provided in a line circuit of a switching system.Type: GrantFiled: September 20, 1989Date of Patent: June 19, 1990Assignee: Fujitsu LimitedInventors: Kenji Takato, Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto
-
Patent number: 4912429Abstract: An operational amplifier for producing an output signal representing the voltage differential between two input signals is powered by first, second and third power sources respectively having high, intermediate and low output voltage levels. A voltage buffer circuit, which is connected to the second power source, interconnects a constant current source, which is connected to the first power source, and an amplifier means, which is connected to the third power source, and separates the constant current source from the third power source. A differential amplifier in the amplifier means responds to the two input signals for producing a voltage differential output signal, and an output circuit connected between the second and third power sources receives the voltage differential output signal of the differential amplifier for producing the voltage differential output signal of the operational amplifier.Type: GrantFiled: March 20, 1989Date of Patent: March 27, 1990Assignee: Fujitsu LimitedInventors: Kenji Takato, Toshiro Tojo, Kazumi Kinoshita, Yuzo Yamamoto
-
Patent number: 4862309Abstract: A protection circuit for a battery feed circuit used in a switching system. The protection circuit is comprised of: a supervising circuit for detecting an abnormal current flowing through a battery feed resistor; and a voltage limiting circuit for clamping a voltage across the battery feed resistor when the abnormal current is detected. Further, a control circuit is employed for stopping an operational amplifier, which is a component of a conventional battery feed circuit, when the abnormal current is detected.Type: GrantFiled: June 16, 1988Date of Patent: August 29, 1989Assignee: Fujitsu LimitedInventors: Toshiro Tojo, Kenji Takato, Kazumi Kinoshita, Yuzo Yamamoto