Patents by Inventor Kunitake Matsushita
Kunitake Matsushita 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: 20040058777Abstract: A planetary gear reduction device with a torque limiter function includes a housing, an input shaft rotatably supported by one end of the housing and connected to a power source so as to input a torque from the power source, an output shaft rotatably supported by the other end of the housing so as to output the torque from the power source, a reduction gear train provided between the input shaft and the output shaft and constituted of a plurality of gears meshing with one another, and a torque limiting mechanism mounted in the reduction gear train. In this device, when an excessive torque is generated in the output shaft, torque transmission from the input shaft to the output shaft is disconnected by the action of the torque limiting mechanism.Type: ApplicationFiled: September 24, 2003Publication date: March 25, 2004Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Kazuo Muramatsu
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Publication number: 20040041494Abstract: A bobbin comprises: a bobbin body consisting generally of a cylinder having a winding of a magnet wire therearound, and two flanges; and a bobbin cover formed generally into a cylindrical ring. The bobbin body includes a coil termination block protruding radially from an inner flange of the two and having terminal pins for external connection, and the bobbin cover includes a termination protector protruding radially from the bobbin cover and adapted to mate with the coil termination block when the bobbin cover is put over the bobbin body.Type: ApplicationFiled: August 28, 2003Publication date: March 4, 2004Inventors: Yuzuru Suzuki, Taketoshi Ohyashiki, Hiroshi Sano, Hideki Sakiyama, Kunitake Matsushita
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Patent number: 6682454Abstract: A planetary gear reduction device with a torque limiter function includes a housing, an input shaft rotatably supported by one end of the housing and connected to a power source so as to input a torque from the power source, an output shaft rotatably supported by the other end of the housing so as to output the torque from the power source, a reduction gear train provided between the input shaft and the output shaft and constituted of a plurality of gears meshing with one another, and a torque limiting mechanism mounted in the reduction gear train. In this device, when an excessive torque is generated in the output shaft, torque transmission from the input shaft to the output shaft is disconnected by the action of the torque limiting mechanism.Type: GrantFiled: November 29, 2001Date of Patent: January 27, 2004Assignee: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Kazuo Muramatsu
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Publication number: 20040012273Abstract: A motor has a hollow-cylindrical shaped rotary shaft provided with a hollow therein and is mounted on a PCB having an LED as light source. Light emitted from the LED passes through the hollow from one end of the rotary shaft to the other end, and irradiates an indicating needle attached to the other end of the rotary shaft.Type: ApplicationFiled: July 10, 2003Publication date: January 22, 2004Inventors: Yuzuru Suzuki, Kunitake Matsushita
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Publication number: 20040000837Abstract: An electric rotary machine is provided, in which a stator armature includes a stator ring that encloses a plurality of salient poles each with a pole tooth thereby forming a magnetic circuit, and in which the inner surface of the stator ring is made flat at portions to be in contact with the outer end faces of the pole teeth so that the stator ring can make surface-to-surface contact with the pole teeth without any air gap therebetween so as to secure a well-balanced magnetic circuit.Type: ApplicationFiled: February 21, 2003Publication date: January 1, 2004Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Seiichi Matsuura
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Publication number: 20030205941Abstract: An electromagnetic actuator with high performance such as high speed and high resolution is inexpensively provided with solutions to problems associated with power supply and leakage flux, which have been involved in the structure of a moving coil type and have been shortcomings of a VCM type actuator. A composite electromagnetic actuator apparatus employs the foregoing electromagnetic actuator. The electromagnetic actuator is equipped with a stationary assembly that includes two coils disposed coaxially with each other inside a hollow stator yoke composed of a soft magnetic material, and a movable assembly composed of a movable magnet unit and a movable yoke unit both disposed inside the coils with a very small clearance therefrom so as to be movable in the axial direction, wherein the movable assembly travels in the axial direction by the interaction between a magnetic field generated by the movable magnet unit and a current passing through the coils.Type: ApplicationFiled: May 22, 2001Publication date: November 6, 2003Applicant: MINEBEA CO., LTD.Inventors: Yuzuru Suzuki, Sakae Fujitani, Naoyuki Harada, Kunitake Matsushita
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Publication number: 20030160523Abstract: An electric rotary machine includes a stator armature which comprises: a stator ring; a plurality of discrete salient poles each including a pole tooth and a coil, disposed inside the stator ring thereby forming a magnetic circuit, and fixed by a molding resin injected inside the stator ring from an injection port of a molding die; and a plurality of barrier walls. Each of the barrier walls is disposed between the injection port of the molding die and two coil terminal pins to which the coil has its both wire terminations connected respectively.Type: ApplicationFiled: February 21, 2003Publication date: August 28, 2003Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Seiichi Matsuura, Kunitake Matsushita, Kazuo Muramatsu
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Publication number: 20030141780Abstract: An electric rotary machine comprises a cylindrical pole tooth ring and a plurality of salient poles each including a pole tooth. The salient poles are each positioned and fixed such the pole tooth makes firm contact with the pole tooth ring by means of each of a plurality of mechanisms, which are arrayed circumferentially on the pole tooth ring, and which each comprise bend-ups adapted to be elastically deformed when the pole tooth is fitted into the mechanism.Type: ApplicationFiled: January 28, 2003Publication date: July 31, 2003Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Seiichi Matsuura, Kunitake Matsushita, Masato Hata, Sakae Fujitani
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Publication number: 20030010146Abstract: A lead screw for a linear actuator, which has a metal pipe having a helical projection resin-molded on its outer surface, and a ball for a pivot bearing welded to a distal end of the metal pipe, is disclosed together with a method of manufacturing the same. With the lead screw according to this invention, a slight positional deviation from the origin, which is caused at a high ambient temperature by thermal expansion of a resin material filled up in the metal pipe, can be prevented reliably. Linear movement upon rotation of a stepping motor can take place with high precision.Type: ApplicationFiled: July 8, 2002Publication date: January 16, 2003Applicant: Minebea Co., Ltd.Inventor: Kunitake Matsushita
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Patent number: 6455962Abstract: A terminal of a motor is provided, in which a connection between a coil and an external circuit can be carried out securely and with a good workability, while saving material resources and enhancing safety relating to environmental pollution. A terminal (23) consists integrally of a magnet wire binding section (20) to connect to a magnet wire (4) of a coil (6), an external connection section (21) to connect to an external circuit and a support base section (22) to press-fit into a terminal block (19) of a bobbin (5) and hold the terminal (23), and the magnet wire (4) is plasma welded for connection through to the external connection section (21) (terminal 23). The connection of the terminal is carried out by welding (plasma welding), thus the end of the magnet wire of a motor (1) is connected without using solder containing lead. As a result, since lead is not used, material resources can be saved and safety relating to the environmental pollution can be enhanced.Type: GrantFiled: March 13, 2001Date of Patent: September 24, 2002Assignee: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Hiroichi Shibata, Naoyuki Harada, Taketoshi Ohyashiki, Sakae Fujitani, Hirohito Nakamata
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Publication number: 20020068658Abstract: A planetary gear reduction device with a torque limiter function includes a housing, an input shaft rotatably supported by one end of the housing and connected to a power source so as to input a torque from the power source, an output shaft rotatably supported by the other end of the housing so as to output the torque from the power source, a reduction gear train provided between the input shaft and the output shaft and constituted of a plurality of gears meshing with one another, and a torque limiting mechanism mounted in the reduction gear train. In this device, when an excessive torque is generated in the output shaft, torque transmission from the input shaft to the output shaft is disconnected by the action of the torque limiting mechanism.Type: ApplicationFiled: November 29, 2001Publication date: June 6, 2002Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Kazuo Muramatsu
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Patent number: 6396189Abstract: A stator assembly of a rotary electric device is manufactured and assembled at reduced cost with an enhanced level of precision. A stator assembly of a rotary electric device comprising a yoke provided with a plurality of stationary magnetic poles and a yoke plate bonded to said yoke by means of synthetic resin in a mold to form an integral unit for enclosing a stator coil is assembled by bringing an alignment pin arranged on a jig for combining the yoke and the yoke plate into engagement with a corresponding alignment sections of the yoke and the yoke plate to put the yoke and the yoke plate together in order to produce a unitary stator assembly and a step of placing the unitary stator assembly of the yoke and the yoke plate in an injection metal mold with said alignment section fitted to an alignment pin arranged in the mold for mutual engagement and injecting synthetic resin into the mold to bond the yoke and the yoke plate together.Type: GrantFiled: September 21, 1995Date of Patent: May 28, 2002Assignee: Minebea Co., Ltd.Inventors: Kunitake Matsushita, Takayuki Yamawaki, Hiroshi Sano, Kazuo Muramatsu
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Publication number: 20020050747Abstract: There is provided a stepping motor of low vibration realized by reducing cogging with a simple structure while maintaining the performances such as torque.Type: ApplicationFiled: October 25, 2001Publication date: May 2, 2002Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Taketoshi Ohyashiki, Kunitake Matsushita
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Publication number: 20020043880Abstract: In order to reduce cost through reduction in material cost and improvement of productivity, in a linear type actuator comprising: a stator unit having coils consisting of wound magnet wires and housed inside stator sub-assemblies and pole teeth arranged on the inner circumference thereof; a rotor unit having a field magnet arranged on the outer circumference thereof and rotatably disposed so as to oppose the pole teeth with a given gap; an output shaft attached to a center portion of the rotor unit and movable in the axial direction thereof; and converting means provided on the innermost diametral circumferential surface of the rotor unit and adapted to convert rotary motion of the rotor unit into linear motion of the output shaft, the converting means is made of a material different from that of the rotor unit.Type: ApplicationFiled: October 10, 2001Publication date: April 18, 2002Applicant: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Sakae Fujitani, Naoyuki Harada, Kunitake Matsushita
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Publication number: 20010026103Abstract: A terminal of a motor is provided, in which a connection between a coil and an external circuit can be carried out securely and with a good workability, while saving material resources and enhancing safety relating to environmental pollution. A terminal (23) consists integrally of a magnet wire binding section (20) to connect to a magnet wire (4) of a coil (6), an external connection section (21) to connect to an external circuit and a support base section (22) to press-fit into a terminal block (19) of a bobbin (5) and hold the terminal (23), and the magnet wire (4) is plasma welded for connection through to the external connection section (21) (terminal 23). The connection of the terminal is carried out by welding (plasma welding), thus the end of the magnet wire of a motor (1) is connected without using solder containing lead. As a result, since lead is not used, material resources can be saved and safety relating to the environmental pollution can be enhanced.Type: ApplicationFiled: March 13, 2001Publication date: October 4, 2001Applicant: MINEBEA CO., LTD.Inventors: Yuzuru Suzuki, Kunitake Matsushita, Hiroichi Shibata, Naoyuki Harada, Taketoshi Ohyashiki, Sakae Fujitani, Hirohito Nakamata
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Patent number: 6177751Abstract: The object of the present invention is to provide a rotary electric machine that provides bobbins with good assembling efficiency and allows no dislocation of the stator. A motor 2 comprises a case 4, a stator 6 secured inside the case 4, a rotor 10 formed into one piece with a rotating shaft 8. The stator 6 comprises stator yokes 32 and the stator yokes are secured in a radial manner in the case 4. Furthermore, resin 58 is filled in between the stator 6 and the case 4 with a space for the rotor being left. The stator yokes 32 comprise a salient pole 34, a bobbin 36 for holding the salient pole 34, and a magnetic wire 38 wound around the bobbin 36. A collar 39b of the bobbin 36 is formed so as to contact each other with notches 3 formed on two, upper and lower edge portions. Accordingly, combining two bobbins 36, 36 allows through-holes 5 penetrating the collar 39b thereof.Type: GrantFiled: August 20, 1999Date of Patent: January 23, 2001Assignee: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Sakae Fujitani, Kunitake Matsushita, Takayuki Yamawaki, Hiroshi Sano, Kazuo Muramatsu, Taichi Nishio
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Patent number: 6166468Abstract: The object of the present invention is to provide a rotary electric machine which has high assembly accuracy, high heat dissipating efficiency, and excellent durability at the bearing portion. A motor comprises a case, a stator secured within the case, and a rotor formed into one piece with a rotary shaft. The case is provided, on both end faces, with flanges, and one of the flanges is provided with a ball bearing. A stator is radially secured within the case, resin is filled in between the stator and the case with a space of the rotor being left, and a bearing housing and a boss are formed on one side. An open portion is formed in between ribs of the bearing housing, and inserting the bearing into the bearing housing causes a part of the bearing to be exposed through the open portion to fixedly contact with the flange. This allows supporting the bearing securely, and allows frictional heat generated, and the like, to dissipate to the outside via the flange.Type: GrantFiled: August 3, 1999Date of Patent: December 26, 2000Assignee: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Sakae Fujitani, Kunitake Matsushita, Takayuki Yamawaki, Hiroshi Sano, Kazuo Muramatsu, Taichi Nishio
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Patent number: 6087755Abstract: A motor structure having an armature yoke 1 including a cylindrical portion and a plurality of salient poles 20 formed in the radial direction on the circumference of one end of the cylindrical portion, characterized by having a stator coil 5 formed by a concentrated winding provided around a salient pole portion 20', which is formed by joining the salient poles 20 of two armature yokes 1 together, and a motor structure characterized by having the above described structure and further having a salient pole piece 11 disposed on the front end of the salient pole portion in confronting relationship with a rotor magnet 2.Type: GrantFiled: August 20, 1998Date of Patent: July 11, 2000Assignee: Minebea Co., Ltd.Inventors: Yuzuru Suzuki, Sakae Fujitani, Masaki Kagawa, Yoshiyuki Aono, Masato Hata, Kunitake Matsushita
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Patent number: 5856718Abstract: A cup shaped base 12 and a cap 13 are coupled, therein coil spring 14 is accommodated to form a holder 11, and the holder is interposed between the bearing 3 of a rotor shaft 4 and a sleeve 5. Different from being directly mounted on the rotor shaft, since the base 12 is provisionally held on the rotor shaft, the operation efficiency at the time of assembling the motor is outstandingly increased.Type: GrantFiled: October 8, 1997Date of Patent: January 5, 1999Assignee: Minebea Co., Ltd.Inventors: Kunitake Matsushita, Takayuki Yamawaki, Hiroshi Sano, Hiroaki Ezure
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Patent number: 5829119Abstract: A stator assembly of a rotary electric device is manufactured and assembled at reduced cost with an enhanced level of precision. A stator assembly of a rotary electric device comprising a yoke provided with a plurality of stationary magnetic poles and a yoke plate bonded to said yoke by means of synthetic resin in a mold to form an integral unit for enclosing a stator coil is assembled by bringing an alignment pin arranged on a jig for combining the yoke and the yoke plate into engagement with a corresponding alignment sections of the yoke and the yoke plate to put the yoke and the yoke plate together in order to produce a unitary stator assembly and a step of placing the unitary stator assembly of the yoke and the yoke plate in an injection metal mold with said alignment section fitted to an alignment pin arranged in the mold for mutual engagement and injecting synthetic resin into the mold to bond the yoke and the yoke plate together.Type: GrantFiled: December 2, 1996Date of Patent: November 3, 1998Assignee: Minebea Co., LtdInventors: Kunitake Matsushita, Takayuki Yamawaki, Hiroshi Sano, Kazuo Muramatsu