Patents by Inventor Mikio Sekine
Mikio Sekine 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: 9804042Abstract: A load sensor is provided with a seat mounting hole between both end parts of a rectangular plate-like main body portion of a load receiving member. A plurality of strain detecting elements the resistance value of each of which changes depending on the amount of strain of the main body portion are disposed around the seat mounting hole. In plan view of the load receiving member, the center point of the seat mounting hole is offset from the center point of the arrangement of the plurality of strain detecting elements toward a part of the load receiving member that has relatively high rigidity.Type: GrantFiled: February 10, 2016Date of Patent: October 31, 2017Assignee: ALPS ELECTRIC CO., LTD.Inventors: Mitsuru Saito, Mikio Sekine
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Publication number: 20160265988Abstract: A load sensor is provided with a seat mounting hole between both end parts of a rectangular plate-like main body portion of a load receiving member. A plurality of strain detecting elements the resistance value of each of which changes depending on the amount of strain of the main body portion are disposed around the seat mounting hole. In plan view of the load receiving member, the center point of the seat mounting hole is offset from the center point of the arrangement of the plurality of strain detecting elements toward a part of the load receiving member that has relatively high rigidity.Type: ApplicationFiled: February 10, 2016Publication date: September 15, 2016Inventors: Mitsuru SAITO, Mikio SEKINE
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Patent number: 6697215Abstract: An index signal output device where a magnetic flux detector is moved in the direction of a relevant tangent to the circumference of a rotor yoke so that the phase difference between an index signal detected by the magnetic flux detector and an index reference signal previously recorded on a floppy disk is within a prescribed range. The lead terminals of the magnetic flux detector are connected to detection signal output terminals on a printed circuit board, and the magnetic flux detector is moved for adjustment in the direction of the tangent by flexing the lead terminals using a tool.Type: GrantFiled: May 15, 2001Date of Patent: February 24, 2004Assignee: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Patent number: 6603304Abstract: An index position detector for a spindle motor includes a rotor magnet which is provided on an inner surface of a flange portion of a rotor yoke. A window portion is formed in the flange portion such that a part of the rotor magnet faces outwardly. An inductor is disposed in a stator section and opposes the periphery of the flange portion. The inductor detects a magnetic flux of the rotor magnet via the window portion.Type: GrantFiled: February 21, 2001Date of Patent: August 5, 2003Assignee: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Patent number: 6476528Abstract: A spindle motor rotor having windows at plural place in a flange of a rotor yoke of a spindle motor; as well as projections producing outwards through the windows, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, wherein the rotor magnet is joined to the rotor yoke by welding these projections and one of the projections stretches over both an N pole and an S pole of the rotor magnet.Type: GrantFiled: May 15, 2001Date of Patent: November 5, 2002Assignee: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Publication number: 20020080511Abstract: A floppy disk drive comprises at least a data read/write-unit for reading or writing data through a head, motor drivers for driving a spindle motor and a stepping motor, a control unit for controlling overall operation of the floppy disk drive, and a data output unit for supplying data to a main controller via a set cable. The data output unit comprises an output transistor outputting the data to the set cable and supplied with a pull-up current from the main controller via the set cable, and a pull-up transistor and a pull-down transistor connected in series between a power source terminal and a ground. The pull-up transistor and the pull-down transistor drive the output transistor in cooperation, and a current limiting resistance is connected in series to the pull-down transistor.Type: ApplicationFiled: December 14, 2001Publication date: June 27, 2002Applicant: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Publication number: 20020059038Abstract: An index position detector for a spindle motor includes a rotor magnet which is provided on an inner surface of a flange portion of a rotor yoke. A window portion is formed in the flange portion such that a part of the rotor magnet faces outwardly. An inductor is disposed in a stator section and opposes the periphery of the flange portion. The inductor detects a magnetic flux of the rotor magnet via the window portion.Type: ApplicationFiled: February 21, 2001Publication date: May 16, 2002Applicant: Alps Electric Co., ltd.Inventor: Mikio Sekine
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Publication number: 20010053040Abstract: An index signal output device where a magnetic flux detector is moved in the direction of a relevant tangent to the circumference of a rotor yoke so that the phase difference between an index signal detected by the magnetic flux detector and an index reference signal previously recorded on a floppy disk is within a prescribed range. The lead terminals of the magnetic flux detector are connected to detection signal output terminals on a printed circuit board, and the magnetic flux detector is moved for adjustment in the direction of the tangent by flexing the lead terminals using a tool.Type: ApplicationFiled: May 15, 2001Publication date: December 20, 2001Applicant: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Publication number: 20010045786Abstract: A spindle motor rotor having windows at plural places in a flange of a rotor yoke of a spindle motor, as well as projections protruding outwards through the windows, integrally provided in some areas of a ring rotor magnet fitted to the inner circumference of the flange, wherein the rotor magnet is joined to the rotor yoke by welding these projections and one of the projections stretches over both an N pole and an S pole of the rotor magnet.Type: ApplicationFiled: May 15, 2001Publication date: November 29, 2001Applicant: Alps Electric Co., Ltd.Inventor: Mikio Sekine
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Patent number: 6166501Abstract: An index signal generating circuit for generating a precise index signal free from time shifting even under ambient temperature changes. An index signal generating circuit includes a magnet attached onto the circumference of the rotor of a spindle motor, a magnetic flux detecting device for detecting magnetic flux of the magnet when the magnet moves past the magnetic flux detecting device, a Hall effect device for switching a current in the driving coil of the spindle motor, a first waveform shaping circuit for shaping the detected output of the magnetic flux detecting device into a rectangular-wave signal, a second waveform shaping circuit for shaping the output of the Hall effect device into a rectangular-wave signal, and a logic circuit for ANDing the output rectangular-wave signals from the first and second waveform shaping circuits, wherein an index signal is generated at the timing of a transition of the AND output of the logic circuit.Type: GrantFiled: February 8, 1999Date of Patent: December 26, 2000Assignee: Alps Electric Co., Ltd.Inventors: Shigeru Furuki, Mikio Sekine
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Patent number: 5995314Abstract: An index signal generating circuit for generating a precise index signal free from time shifting even under ambient temperature changes. An index signal generating circuit includes a magnet attached onto the circumference of the rotor of a spindle motor, a magnetic flux detecting device for detecting magnetic flux of the magnet when the magnet moves past the magnetic flux detecting device, a Hall effect device for switching a current in the driving coil of the spindle motor, a first waveform shaping circuit for shaping the detected output of the magnetic flux detecting device into a rectangular-wave signal, a second waveform shaping circuit for shaping the output of the Hall effect device into a rectangular-wave signal, and a logic circuit for ANDing the output rectangular-wave signals from the first and second waveform shaping circuits, wherein an index signal is generated at the timing of a transition of the AND output of the logic circuit.Type: GrantFiled: May 28, 1997Date of Patent: November 30, 1999Assignee: Alps Electric Co. Ltd.Inventors: Shigeru Furuki, Mikio Sekine