Patents by Inventor Masahiro Jyono
Masahiro Jyono 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: 7898129Abstract: With a spindle motor, a stator core comprises a plurality of salient pole portions that are formed in a radial shape, are wound with a stator coil, and are disposed at a uniform angle except for a non-equiangular pitch region, a circular outer peripheral yoke formed so as to be continuous with the outer peripheral side of the salient pole portions, a cut-out which is formed by cutting out part of the outer peripheral yoke in an approximate sector-shape except in the non-equiangular pitch region of the salient pole portions, and a compensating pole plate which is provided in the cut-out along the ends on the inner peripheral side of the non-equiangular pitch region where the salient pole portions are formed.Type: GrantFiled: April 10, 2009Date of Patent: March 1, 2011Assignee: Panasonic CorporationInventors: Yoichi Oki, Masahiro Jyono, Takao Yoshitsugu
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Publication number: 20090261680Abstract: With a spindle motor 20, a stator core 8 comprises a plurality of salient pole portions 51 that are formed in a radial shape, are wound with a stator coil 9, and are disposed at a uniform angle except for a non-equiangular pitch region, an circular outer peripheral yoke 52 formed so as to be continuous with the outer peripheral side of the salient pole portions 51, a cut-out 55 which is formed by cutting out part of the outer peripheral yoke 52 in an approximate sector-shape except in the non-equiangular pitch region of the salient pole portions 51, and a compensating pole plate 11 which is provided in the cut-out 55 along the ends on the inner peripheral side of the non-equiangular pitch region where the salient pole portions 51 are formed.Type: ApplicationFiled: April 10, 2009Publication date: October 22, 2009Inventors: Yoichi OKI, Masahiro Jyono, Takao Yoshitsugu
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Patent number: 7582996Abstract: A magnet (13) for trapping abraded powder is disposed in a connecting passage between an opening of a sleeve and an opening of a hydrodynamic bearing motor, and a shaft (3), a sleeve (4), a thrust flange (7), and a thrust main plate (5) are made of an austenitic stainless. With this configuration, since the austenitic stainless acting as a nonmagnetic substance is used, it is possible to increase a degree of cleaning. Further, abraded powder of the austenitic stainless is transformed into a magnetic substance, and thus a flow of the abraded powder to the outside can be prevented by providing the magnet for trapping abraded powder in the connecting passage between an opening of a bearing and the outside of the motor.Type: GrantFiled: February 24, 2004Date of Patent: September 1, 2009Assignee: Panasonic CorporationInventors: Takeyoshi Yamamoto, Yasunori Tokuno, Masahiro Jyono, Taizo Ikegawa
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Patent number: 7535134Abstract: With a spindle motor 20, a stator core 8 comprises a plurality of salient pole components 51 that are formed in a radial shape, are wound with a stator coil 9, and are disposed at a uniform angle except for a non-equiangular pitch portion, an circular outer peripheral yoke 52 formed so as to be continuous with the outer peripheral side of the salient pole components 51, a cut-out 55 which is formed by cutting out part of the outer peripheral yoke 52 in an approximate sector-shape except in the non-equiangular pitch portion of the salient pole components 51, and a compensating pole plate 11 which is provided in the cut-out 55 along the ends on the inner peripheral side of the non-equiangular pitch portion where the salient pole components 51 are formed.Type: GrantFiled: September 21, 2006Date of Patent: May 19, 2009Assignee: Panasonic CorporationInventors: Yoichi Oki, Masahiro Jyono, Takao Yoshitsugu
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Patent number: 7420309Abstract: In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.Type: GrantFiled: November 29, 2007Date of Patent: September 2, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akihiko Wakitani, Masahiro Jyono, Takao Yoshitsugu, Yoshihiro Ashizaki
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Publication number: 20080129139Abstract: In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.Type: ApplicationFiled: November 29, 2007Publication date: June 5, 2008Inventors: Akihiko Wakitani, Masahiro Jyono, Takao Yoshitsugu, Yoshihiro Ashizaki
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Patent number: 7321178Abstract: In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.Type: GrantFiled: December 5, 2005Date of Patent: January 22, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Akihiko Wakitani, Masahiro Jyono, Takao Yoshitsugu, Yoshihiro Ashizaki
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Patent number: 7294946Abstract: A dynamic pressure gas bearing motor in which a radial dynamic pressure gas bearing and a thrust dynamic pressure gas bearing are ensured to have sufficient length and diameter even though the clamping screw holes for introducing screws to reliably hold a disk are formed in the top wall of the motor rotation body.Type: GrantFiled: February 24, 2004Date of Patent: November 13, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masahiro Jyono, Yasunori Tokuno, Takeyoshi Yamamoto, Taizo Ikegawa, Satoko Miki
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Publication number: 20070090716Abstract: With a spindle motor 20, a stator core 8 comprises a plurality of salient pole components 51 that are formed in a radial shape, are wound with a stator coil 9, and are disposed at a uniform angle except for a non-equiangular pitch portion, an circular outer peripheral yoke 52 formed so as to be continuous with the outer peripheral side of the salient pole components 51, a cut-out 55 which is formed by cutting out part of the outer peripheral yoke 52 in an approximate sector-shape except in the non-equiangular pitch portion of the salient pole components 51, and a compensating pole plate 11 which is provided in the cut-out 55 along the ends on the inner peripheral side of the non-equiangular pitch portion where the salient pole components 51 are formed.Type: ApplicationFiled: September 21, 2006Publication date: April 26, 2007Inventors: Yoichi Oki, Masahiro Jyono, Takao Yoshitsugu
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Publication number: 20070013255Abstract: In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.Type: ApplicationFiled: December 5, 2005Publication date: January 18, 2007Inventors: Akihiko Wakitani, Masahiro Jyono, Takao Yoshitsugu, Yoshihiro Ashizaki
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Publication number: 20060170297Abstract: A dynamic pressure gas bearing motor in which a radial dynamic pressure gas bearing and a thrust dynamic pressure gas bearing are ensured to have sufficient length and diameter even though the clamping screw holes for introducing screws to reliably hold a disk are formed in the top wall of the motor rotation body.Type: ApplicationFiled: February 24, 2004Publication date: August 3, 2006Inventors: Masahiro Jyono, Yasunori Tokuno, Takeyoshi Yamamoto, Taizo Ikegawa, Satoko Miki
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Publication number: 20060138887Abstract: A magnet (13) for trapping abraded powder is disposed in a connecting passage between an opening of a sleeve and an opening of a hydrodynamic bearing motor, and a shaft (3), a sleeve (4), a thrust flange (7), and a thrust main plate (5) are made of an austenitic stainless. With this configuration, since the austenitic stainless acting as a nonmagnetic substance is used, it is possible to increase a degree of cleaning. Further, abraded powder of the austenitic stainless is transformed into a magnetic substance, and thus a flow of the abraded powder to the outside can be prevented by providing the magnet for trapping abraded powder in the connecting passage between an opening of a bearing and the outside of the motor.Type: ApplicationFiled: February 24, 2004Publication date: June 29, 2006Inventors: Takeyoshi Yamamoto, Yasunori Tokuno, Masahiro Jyono, Taizo Ikegawa
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Patent number: 6911753Abstract: A gas dynamic bearing motor is provided that is capable of setting a bearing radius to a large value to obtain a sufficient radial stiffness, and preventing lock of the bearing and scattering of wear powder outside the bearing. An annular groove 11 is provided on a lower end surface 87 of a hub 3 to thereby enable a deformation of an inner circumferential surface 82 of the hub 3 when recording disks 9 are loaded on the hub 3 to be suppressed to a small value, thereby enabling partial contact in the radial bearing to be suppressed and lock of the bearing to be prevented. Further, a protrusion 12 is provided on a base 7 in a circumferential direction and fitted in the annular groove 11 to construct a labyrinth seal, thereby enabling scattering of wear powder generated on bearing surfaces outside the bearing to be prevented.Type: GrantFiled: March 11, 2004Date of Patent: June 28, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Taizo Ikegawa, Masahiro Jyono, Yasunori Tokuno, Takeyoshi Yamamoto, Satoko Miki
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Publication number: 20040178688Abstract: A gasdynamic bearing motor is provided that is capable of setting a bearing radius to a large value to obtain a sufficient radial stiffness, and preventing lock of the bearing and scattering of wear powder outside the bearing. An annular groove 11 is provided on a lower end surface 87 of a hub 3 to thereby enable a deformation of an inner circumferential surface 82 of the hub 3 when recording disks 9 are loaded on the hub 3 to be suppressed to a small value, thereby enabling partial contact in the radial bearing to be suppressed and lock of the bearing to be prevented. Further, a protrusion 12 is provided on a base 7 in a circumferential direction and fitted in the annular groove 11 to construct a labyrinth seal, thereby enabling scattering of wear powder generated on bearing surfaces outside the bearing to be prevented.Type: ApplicationFiled: March 11, 2004Publication date: September 16, 2004Applicant: Matsushita Elec. Ind. Co. Ltd.Inventors: Taizo Ikegawa, Masahiro Jyono, Yasunori Tokuno, Takeyoshi Yamamoto, Satoko Miki