Patents by Inventor Toshiaki Tsuzaki
Toshiaki Tsuzaki 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: 7825619Abstract: A method for controlling stopping of a vibration generating stepping motor is a method for controlling the stopping of an vibration generating stepping motor by a control unit, characterized in that the method includes: stopping a supply of a driving pulse to the vibration generating stepping motor while applying a driving voltage to the vibration generating stepping motor; applying the driving voltage to the stepping motor, which does not completely stop, for an optimum braking time according to a motor configuration of the stepping motor, so as to brake the stepping motor; and stopping the applying of the driving voltage to the stepping motor which is rotating under inertia after the elapse of the optimum braking time.Type: GrantFiled: December 28, 2006Date of Patent: November 2, 2010Assignee: Minebea Motor Manufacturing CorporationInventors: Masaki Matsubara, Kazuaki Sato, Mikio Umehara, Toshiaki Tsuzaki
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Publication number: 20090134733Abstract: Provided is a vibration generating stepping motor, which is ensured for holding a stop position by increasing a detent torque. The pole teeth of one stator yoke of a single-phase stator yoke assembly includes two kinds of pole teeth made different in the outermost side faces in the radial direction, and the pole teeth of the other stator yoke are comprised of two kinds of pole teeth made different in the outermost side faces in the radial direction. The pole teeth of one kind of the aforementioned individual stator yokes are made to have the same shape. The pole teeth of the remaining two kinds not given the same shape are combined and arranged to increase the detent torque.Type: ApplicationFiled: October 31, 2006Publication date: May 28, 2009Inventors: Masaaki Matsubara, Kazuaki Sato, Mikio Umehara, Toshiaki Tsuzaki
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Patent number: 7271516Abstract: A stepping motor for generating vibration is provided and includes a stator and a rotor. The rotor includes a shaft, a ring magnet and a rotor frame, and the rotor frame is formed into a substantial cup-shape including a disk portion having an opening at the center and also including a cylindrical portion continuously arranged at the periphery of the disk portion, and a weight portion is arranged in a portion of the rotor frame so that the gravity center of the rotor frame an be located at a position eccentric with respect to the center of the rotor frame.Type: GrantFiled: April 28, 2006Date of Patent: September 18, 2007Assignee: Minebea-Matsushita MotorInventors: Masaaki Matsubara, Kazuaki Sato, Osamu Furuta, Mikio Umehara, Toshiaki Tsuzaki, Chee Poh Chua
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Publication number: 20060267427Abstract: A stepping motor for generating vibration is provided and includes a stator and a rotor. The rotor includes a shaft, a ring magnet and a rotor frame, and the rotor frame is formed into a substantial cup-shape including a disk portion having an opening at the center and also including a cylindrical portion continuously arranged at the periphery of the disk portion, and a weight portion is arranged in a portion of the rotor frame so that the gravity center of the rotor frame an be located at a position eccentric with respect to the center of the rotor frame.Type: ApplicationFiled: April 28, 2006Publication date: November 30, 2006Inventors: Masaaki Matsubara, Kazuaki Sato, Osamu Furuta, Mikio Umehara, Toshiaki Tsuzaki, Chee Chua
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Patent number: 6628025Abstract: A motor includes (a) a cylindrical frame made of ferromagnetic material, (b) a pipe fitted in and disposed within the frame concentrically, (c) a sintered bearing press-fitted into the pipe, (d) a cylindrical magnet fixed on an outer wall of the pipe at an inner wall of the magnet, and (e) a cylindrical coil facing the magnet via an annular space, where the frame and the pipe are welded at a fitted section therebetween. This structure allows the motor to withstand a strong enough shock. An apparatus requiring a vibration motor can employ this motor having a large vibrator, so that great vibrations are available for the apparatus. As a result, the apparatus—utilizing the great vibrations as various functions—is obtainable.Type: GrantFiled: December 14, 2001Date of Patent: September 30, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Eiichi Ibata, Toshiaki Tsuzaki, Hideo Kobayashi
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Patent number: 6563242Abstract: A slim motor good for a portable device includes a frame, pipe, magnet, coil, shaft, first bearing and a second bearing (inside bearing). The pipe is disposed on an inner wall of the cylindrical magnet, and an outer diameter of the second bearing is set at approx. the same as that of the pipe. The second bearing is aligned to the pipe in an axial direction and fixed on the inner wall of the magnet. This structure allows the magnet to extend axially long enough, and solves conventional problems including power consumption, slant of the shaft, motor efficiency, productivity and the like, thereby contributing to achieving a slimmer motor and a slimmed-down device.Type: GrantFiled: February 20, 2001Date of Patent: May 13, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Eiichi Ibata, Toshiaki Tsuzaki
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Patent number: 6479914Abstract: A motor includes a stator and a rotor facing the stator. The rotor has a magnet and an eccentric weight. The magnet is magnetized in a rotational direction and produces driving magnetic field. The eccentric weight is made of the material having a greater specific gravity than the magnet. The magnet shapes in a cylinder and a part of the cylinder is cut away to form a space. The eccentric weight is placed in the space. A rotational area of the magnet and that of the eccentric weight overlap each other. In this structure, rotation of the rotor spins the eccentric weight, thereby producing large vibrations. The eccentric weight is accommodated by a motor housing for the safety. The thin and compact motor is thus obtainable.Type: GrantFiled: January 26, 2001Date of Patent: November 12, 2002Assignee: Matsushita Electric IndustrialInventors: Shigeru Yoshida, Kodo Fukuoka, Kouji Kuyama, Toshiaki Tsuzaki
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Publication number: 20020158528Abstract: An unbalance weight of a vibration motor includes a rest section for receiving a rotary shaft and a caulking section for caulking the unbalance weight to the rotary shaft. The rotary shaft includes a recess at a place corresponding to the rest section. Caulking strength applied to the caulking section forces parts of the weight to bite inside of the recess, thereby fixing the weight to the rotary shaft. This structure allows the rotary shaft to hold the weight tightly. The vibration motor can be mounted to a radio paging-device or a cellular phone, so that the user can sense the vibrations to be informed of a calling or a message arrival. The vibration motor is thus suited for a source of vibrations.Type: ApplicationFiled: February 4, 2002Publication date: October 31, 2002Inventors: Toshiaki Tsuzaki, Eiichi Ibata
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Patent number: 6424064Abstract: An electromagnetic vibrator includes a vibration generating mechanism; a case for containing at least part of the vibration generating mechanism; a power supply terminal for supplying power to the vibration generating mechanism, protruding from the case; an elastic body covering at least part of the case; and an elastic pressing body deformable under pressure, formed in part of the elastic body. When the electromagnetic vibrator is incorporated into a device, part of the device presses the case. Correspondingly, the elastic pressing body presses the power supply terminal toward a power supply land disposed on the device side, and the power supply terminal contacts the power supply land thereby electrically connecting itself to the power supply land. With this construction is provided a highly reliable electromagnetic vibrator and device incorporating the electromagnetic vibrator with electric connections having high vibration resistance and impact resistance.Type: GrantFiled: May 17, 2001Date of Patent: July 23, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Eiichi Ibata, Toshiaki Tsuzaki, Kodo Fukuoka
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Publication number: 20020089247Abstract: A motor includes (a) a cylindrical frame made of ferromagnetic material, (b) a pipe fitted in and disposed within the frame concentrically, (c) a sintered bearing press-fitted into the pipe, (d) a cylindrical magnet fixed on an outer wall of the pipe at an inner wall of the magnet, and (e) a cylindrical coil facing the magnet via an annular space, where the frame and the pipe are welded at a fitted section therebetween. This structure allows the motor to withstand a strong enough shock. An apparatus requiring a vibration motor can employ this motor having a large vibrator, so that great vibrations are available for the apparatus. As a result, the apparatus—utilizing the great vibrations as various functions—is obtainable.Type: ApplicationFiled: December 14, 2001Publication date: July 11, 2002Inventors: Eiichi Ibata, Toshiaki Tsuzaki, Hideo Kobayashi
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Publication number: 20020047388Abstract: A slim motor good for a portable device includes a frame, pipe, magnet, coil, shaft, first bearing and a second bearing (inside bearing). The pipe is disposed on an inner wall of the cylindrical magnet, and an outer diameter of the second bearing is set at approx. the same as that of the pipe. The second bearing is aligned to the pipe in an axial direction and fixed on the inner wall of the magnet. This structure allows the magnet to extend axially long enough, and solves conventional problems including power consumption, slant of the shaft, motor efficiency, productivity and the like, thereby contributing to achieving a slimmer motor and a slimmed-down device.Type: ApplicationFiled: February 20, 2001Publication date: April 25, 2002Inventors: Eiichi Ibata, Toshiaki Tsuzaki
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Publication number: 20020047369Abstract: A motor includes a stator and a rotor facing the stator. The rotor has a magnet and an eccentric weight. The magnet is magnetized in a rotational direction and produces driving magnetic field. The eccentric weight is made of the material having a greater specific gravity than the magnet. The magnet shapes in a cylinder and a part of the cylinder is cut away to form a space. The eccentric weight is placed in the space. A rotational area of the magnet and that of the eccentric weight overlap each other. In this structure, rotation of the rotor spins the eccentric weight, thereby producing large vibrations. The eccentric weight is accommodated by a motor housing for the safety. The thin and compact motor is thus obtainable.Type: ApplicationFiled: January 26, 2001Publication date: April 25, 2002Inventors: Shigeru Yoshida, Kodo Fukuoka, Kouji Kuyama, Toshiaki Tsuzaki
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Publication number: 20010022476Abstract: An electromagnetic vibrator includes a vibration generating mechanism; a case for containing at least part of the vibration generating mechanism; a power supply terminal for supplying power to the vibration generating mechanism, protruding from the case; an elastic body covering at least part of the case; and an elastic pressing body deformable under pressure, formed in part of the elastic body. When the electromagnetic vibrator is incorporated into a device, part of the device presses the case. Correspondingly, the elastic pressing body presses the power supply terminal toward a power supply land disposed on the device side, and the power supply terminal contacts the power supply land thereby electrically connecting itself to the power supply land. With this construction is provided a highly reliable electromagnetic vibrator and device incorporating the electromagnetic vibrator with electric connections having high vibration resistance and impact resistance.Type: ApplicationFiled: May 17, 2001Publication date: September 20, 2001Inventors: Eiichi Ibata, Toshiaki Tsuzaki, Kodo Fukuoka
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Patent number: 6271610Abstract: An electromagnetic vibrator includes a vibration generating mechanism; a case for containing at least part of the vibration generating mechanism; a power supply terminal for supplying power to the vibration generating mechanism, protruding from the case; an elastic body covering at least part of the case; and an elastic pressing body deformable under pressure, formed in part of the elastic body. When the electromagnetic vibrator is incorporated into a device, part of the device presses the case. Correspondingly, the elastic pressing body presses the power supply terminal toward a power supply land disposed on the device side, and the power supply terminal contacts the power supply land thereby electrically connecting itself to the power supply land. With this construction is provided a highly reliable electromagnetic vibrator and device incorporating the electromagnetic vibrator with electric connections having high vibration resistance and impact resistance.Type: GrantFiled: August 27, 1999Date of Patent: August 7, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Eiichi Ibata, Toshiaki Tsuzaki, Kodo Fukuoka
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Patent number: 6140721Abstract: A slender-type cylindrical coreless motor for use in battery driven equipment in which power-consumption is low, high reliability is achieved, miniaturization and long-term battery driving of the equipment are realized. The slender-type cylindrical coreless motor includes: a pipe (2) with one end fixed to a frame (1); a cylindrical magnet (3) disposed around the outer surface of the pipe (2); and an inner bearing (7) for holding a fixed portion of a shaft (5) to a rotor assembly body (4). A second end portion of the pipe (2) has a length that does not permit protrusion thereof from an end surface (3b) of the magnet (3), and the inner bearing (7) is located at the end surface (3b) of the magnet (3) concentrically with the outer diameter of the magnet. Portions of the inner bearing (7) and the end surface facing each other are joined with solder material, and portions of the pipe (2) and the magnet (3) facing each other are joined with solder material.Type: GrantFiled: July 29, 1999Date of Patent: October 31, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Eiichi Ibata, Toshiaki Tsuzaki
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Patent number: 5986367Abstract: In a motor mounting mechanism, a cylindrical motor includes a frame (6) serving as a stator and an electric power supply terminal (2) attached to a bottom surface of a bracket (1). When the motor is mounted to a motor attachment device, a first external electrode (10) is mechanically and electrically connected to a cylindrical side surface of the frame (6) while a second external electrode (11) is mechanically and electrically connected to the power supply terminal (2). The first and second external electrodes are both located outside the motor, and thus, the process of providing lead wires for connecting the external electrodes to the printed board can be omitted, allowing the total size of the motor mounting mechanism to be reduced.Type: GrantFiled: March 28, 1997Date of Patent: November 16, 1999Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshiaki Tsuzaki, Koji Kuyama, Eiichi Ibata, Kodo Fukuoka, Hideki Shimada
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Patent number: 5804895Abstract: A miniature motor includes a frame which has been solder treated on its surface and which has a closed end and is generally cylindrical-shaped or generally oval-shaped in cross section. The frame includes a projected portion of an outer periphery thereof for insertion into a hole of a printed circuit board. The projecting portion has a notch for holding the printed circuit board therein, wherein the printed circuit board and the projected portion extending through the hole of the printed circuit board are soldered to each other with solder while the printed circuit board is held in the notch of the projected portion.Type: GrantFiled: September 1, 1994Date of Patent: September 8, 1998Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshiaki Tsuzaki, Eiichi Ibata
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Patent number: 5347187Abstract: In a miniature electric motor a hollow cylindrical socket (2) is formed by deep drawing process on a roof plate of a frame (1), and in this socket (2) a bearing housing (4) is tightly fit projecting outwardly and inwardly from its roof plane, and at least one bearing metal (3) is further tightly fitted therein in a manner to project from both ends of the bearing housing (4).By utilizing the draw-worked socket (2) for tightly holding the bearing metal (3), the accuracy of axis or circularity of the bearing hole is assured.Type: GrantFiled: July 16, 1992Date of Patent: September 13, 1994Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toshiaki Tsuzaki, Noriyoshi Naito