Patents by Inventor Yasuo Saeki
Yasuo Saeki 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: 6467963Abstract: Fluid bearing equipment which is free from lockup or seizure which may occur due to a deficiency of a lubricating fluid when the equipment is operated at a high rotation speed in a high temperature environment. The fluid bearing equipment is arranged such that maximum pressure generating portions 23 of dynamic pressure generating grooves 15, 16 provided in a thrust-side dynamic pressure generating portion are located closer to the outer circumference of a stationary thrust plate 9 than a radially middle position of the thrust-side dynamic pressure generating portion. With this arrangement, the lockup and seizure of a motor can be prevented which may otherwise occur due to a deficiency of the lubricating fluid when the equipment is operated at a high rotation speed in a high temperature environment.Type: GrantFiled: February 4, 1999Date of Patent: October 22, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsunori Sakuragi, Takao Yoshitsugu, Yasuo Saeki, Hideshi Fukutani
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Patent number: 6404586Abstract: In a spindle device mounted to a disc driving apparatus, a mist seal which blocks a mist of lubricating fluid, an oil seal which prevents the lubricating fluid from flowing out, and an oil pool which prevents surplus fluid from flowing out, are combined and disposed so that the lubricating fluid from a dynamic-pressure-fluid bearing is prevented from flowing out or splashing into a clean space. As a result, inconveniences such as a head crush or a head absorption can be avoided, and a reliable spindle device is realized.Type: GrantFiled: August 17, 2001Date of Patent: June 11, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsunori Sakuragi, Yasuo Saeki
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Patent number: 6357916Abstract: A hydrodynamic bearing which prevents a lubricating fluid from scattering out of the dynamic pressure generating portion. The bearing includes radial spacing d of a gap at an open end of the thrust-side dynamic pressure generating portion, whose value is greater than a spacing of the thrust-side dynamic pressure generating portion, as measured relative to the thrust direction. Scattering of lubricating fluid from the open end of the thrust-side dynamic pressure generating portion is therefore prevented even when the bearing rotates at a high speed in a high temperature envivronent.Type: GrantFiled: February 5, 1999Date of Patent: March 19, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasuo Saeki, Takao Yoshitsugu, Katsunori Sakuragi, Hideshi Fukutani
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Publication number: 20020003678Abstract: In a spindle device mounted to a disc driving apparatus, a mist seal which blocks a mist of lubricating fluid, an oil seal which prevents the lubricating fluid from flowing out, and an oil pool which prevents surplus fluid from flowing out, are combined and disposed so that the lubricating fluid from a dynamic-pressure-fluid bearing is prevented from flowing out or splashing into a clean space. As a result, inconveniences such as a head crush or a head absorption can be avoided, and a reliable spindle device is realized.Type: ApplicationFiled: August 17, 2001Publication date: January 10, 2002Inventors: Katsunori Sakuragi, Yasuo Saeki
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Publication number: 20010046336Abstract: An object of the present invention is to provide a hydrodynamic bearing device which has an improved construction to prevent a lubricating fluid from scattering out of a dynamic pressure generating portion. The hydrodynamic bearing device of the present invention is characterized in that a radial spacing &Dgr;d of a gap at an open end of a thrust-side dynamic pressure generating portion is set greater than a spacing 26 of the thrust-side dynamic pressure generating portion as measured with respect to the thrust direction. With this arrangement, the scattering of the lubricating fluid from the open end of the thrust-side dynamic pressure generating portion is prevented even when the hydrodynamic bearing device is operated at a high rotation speed in a high temperature environment.Type: ApplicationFiled: February 5, 1999Publication date: November 29, 2001Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: YASUO SAEKI, TAKAO YOSHITSUGU, KATSUNORI SAKURAGI, HIDESHI FUKUTANI
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Patent number: 6301074Abstract: In a spindle device mounted to a disc driving apparatus, a mist seal which blocks a mist of lubricating fluid, an oil seal which prevents the lubricating fluid from flowing out, and an oil pool which prevents surplus fluid from flowing out, are combined and disposed so that the lubricating fluid from a dynamic-pressure-fluid bearing is prevented from flowing out or splashing into a clean space. As a result, inconveniences such as a head crush or a head absorption can be avoided, and a reliable spindle device is realized.Type: GrantFiled: February 13, 2001Date of Patent: October 9, 2001Assignee: Matsushita Electric Industrial Co. Ltd.Inventors: Katsunori Sakuragi, Yasuo Saeki
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Publication number: 20010014188Abstract: An object of the present invention is to provide a fluid bearing equipment which is free from lockup or seizure which may occur due to a deficiency of a lubricating fluid when the equipment is operated at a high rotation speed in a high temperature environment. The fluid bearing equipment is arranged such that maximum pressure generating portions 23 of dynamic pressure generating grooves 15, 16 provided in a thrust-side dynamic pressure generating portion are located closer to the outer circumference of a stationary thrust plate 9 than a radially middle position of the thrust-side dynamic pressure generating portion. With this arrangement, the lockup and seizure of a motor can be prevented which may otherwise occur due to a deficiency of the lubricating fluid when the equipment is operated at a high rotation speed in a high temperature environment.Type: ApplicationFiled: February 4, 1999Publication date: August 16, 2001Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: KATSUNORI SAKURAGI, TAKAO YOSHITSUGU, YASUO SAEKI, HIDESHI FUKUTANI
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Publication number: 20010005296Abstract: In a spindle device mounted to a disc driving apparatus, a mist seal which blocks a mist of lubricating fluid, an oil seal which prevents the lubricating fluid from flowing out, and an oil pool which prevents surplus fluid from flowing out, are combined and disposed so that the lubricating fluid from a dynamic-pressure-fluid bearing is prevented from flowing out or splashing into a clean space. As a result, inconveniences such as a head crush or a head absorption can be avoided, and a reliable spindle device is realized.Type: ApplicationFiled: February 13, 2001Publication date: June 28, 2001Inventors: Katsunori Sakuragi, Yasuo Saeki
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Patent number: 6219199Abstract: In a spindle device mounted to a disc driving apparatus, a mist seal which blocks a mist of lubricating fluid, an oil seal which prevents the lubricating fluid from flowing out, and an oil pool which prevents surplus fluid from flowing out, are combined and disposed so that the lubricating fluid from a dynamic-pressure-fluid bearing is prevented from flowing out or splashing into a clean space. As a result, inconveniences such as a head crush or a head absorption can be avoided, and a reliable spindle device is realized.Type: GrantFiled: September 11, 1998Date of Patent: April 17, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsunori Sakuragi, Yasuo Saeki
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Patent number: 6196722Abstract: It is an object of the present invention to provide a hydrodynamic bearing which is highly reliable and capable of preventing a lubricant contained therein from flowing out of the bearing. In the hydrodynamic bearing, lower and upper end portions of a stationary shaft are properly spaced from a sleeve and a thrust plate, respectively, and an air channel is provided inside the stationary shaft with one end thereof opening to a space defined between an outer circumferential portion of the stationary shaft and the sleeve and with the other end thereof communicating with the outside. Thus, the hydrodynamic bearing has a highly reliable construction which can assuredly prevent the flow-out of the lubricant.Type: GrantFiled: January 11, 1999Date of Patent: March 6, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takafumi Asada, Hiroaki Saito, Takao Yoshitsugu, Yasuo Saeki, Katsunori Sakuragi
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Patent number: 4697820Abstract: A ski comprises a ski upper-surface constituting member provided with at least one cut portion of any desired shape; and an upper-surface projection member defined by at least one upper-surface member and a reinforcing member which are separately formed, and having the shape of a roof whose ridge is defined by the widthwise central portion thereof. The upper-surface projection member is fitted and secured into the cut portion, thereby to form a roof-shaped projection on the upper-surface constituting member.Type: GrantFiled: February 3, 1984Date of Patent: October 6, 1987Assignee: Mizuno CorporationInventors: Keijiro Hayashi, Kenzo Shinya, Yasuo Saeki, Shigeru Asai