Patents by Inventor Akio Okamiya
Akio Okamiya 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: 20070103020Abstract: A motor that can prevent damages on the fluid dynamic bearing. A ball is press-fitted into the end surface of the shaft body, and the ball is disposed in such a manner that the tip portion of the ball comes to the higher position with respect to the end surface of the annular body. When the shaft is at rest, the ball abuts against the upper surface of the counter plate, and the end surface of the annular body is brought into a state of being raised from the upper surface of the counter plate, so that the situation in which the end surface of the annular body and the upper surface of the counter plate are brought into almost fully touch each other can be avoided. Therefore, when the operation is started, the circulation speed of a fluid increases and a fluid layer is quickly formed. As a consequent, the fluid circularity blocking action, which could be occurred in the relate art, is avoided, and generation of scratch caused by starting rotation in the tightly sticked state can be positively prevented.Type: ApplicationFiled: December 27, 2006Publication date: May 10, 2007Applicant: MINEBEA CO., LTD.Inventors: Rikuro Obara, Akio Okamiya
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Patent number: 7176594Abstract: A motor that can prevent damages on the fluid dynamic bearing. A ball is press-fitted into the end surface of the shaft body, and the ball is disposed in such a manner that the tip portion of the ball comes to the higher position with respect to the end surface of the annular body. When the shaft is at rest, the ball abuts against the upper surface of the counter plate, and the end surface of the annular body is brought into a state of being raised from the upper surface of the counter plate, so that the situation in which the end surface of the annular body and the upper surface of the counter plate are brought into almost fully touch each other can be avoided. Therefore, when the operation is started, the circulation speed of a fluid increases and a fluid layer is quickly formed. As a consequent, the fluid circularity blocking action, which could be occurred in the relate art, is avoided, and generation of scratch caused by starting rotation in the tightly sticked state can be positively prevented.Type: GrantFiled: January 14, 2004Date of Patent: February 13, 2007Assignee: Minebea Co., Ltd.Inventors: Rikuro Obara, Akio Okamiya
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Patent number: 7160622Abstract: An oil repelling agent to coat a dynamic pressure device, such as a fluid dynamic pressure bearing device, includes a UV coloring agent, a fluorine-based polymer and a solvent. In an exemplary embodiment of the invention, the concentration of the UV coloring agent component is about 100 PPM to about 400 PPM, and the concentration of the fluorine polymer is about 0.1% by weight to about 0.6% by weight.Type: GrantFiled: September 4, 2003Date of Patent: January 9, 2007Assignee: Minebea Co., Ltd.Inventors: Akio Okamiya, Takahiko Ito
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Patent number: 6890389Abstract: In order to remove or decrease fine granular sulfides of Mn, Cr, Mo, etc. (Mn—S, Cr—S, Mo—S, etc.) left on a machined workpiece surface of sulfur free-cutting alloy steel without affecting the form and dimensional accuracy thereof, there is provided a method for treating the sulfur free-cutting alloy steel which comprises a soaking process of the machined workpiece in a solvent and an ultrasonic cleaning process by applying ultrasonic waves of 1.0 to 2.0 W/cm2 in watt density at a frequency of 40 KHz or a multi frequency in the solvent.Type: GrantFiled: July 18, 2002Date of Patent: May 10, 2005Assignee: Minebea Co., Ltd.Inventors: Akio Okamiya, Masato Nasu
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Publication number: 20040160137Abstract: A motor that can prevent damages on the fluid dynamic bearing. A ball is press-fitted into the end surface of the shaft body, and the ball is disposed in such a manner that the tip portion of the ball comes to the higher position with respect to the end surface of the annular body. When the shaft is at rest, the ball abuts against the upper surface of the counter plate, and the end surface of the annular body is brought into a state of being raised from the upper surface of the counter plate, so that the situation in which the end surface of the annular body and the upper surface of the counter plate are brought into almost fully touch each other can be avoided. Therefore, when the operation is started, the circulation speed of a fluid increases and a fluid layer is quickly formed. As a consequent, the fluid circularity blocking action, which could be occurred in the relate art, is avoided, and generation of scratch caused by starting rotation in the tightly sticked state can be positively prevented.Type: ApplicationFiled: January 14, 2004Publication date: August 19, 2004Applicant: Minebea Co., Ltd.Inventors: Rikuro Obara, Akio Okamiya
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Publication number: 20040132881Abstract: An oil repelling agent to coat a dynamic pressure device, such as a fluid dynamic pressure bearing device, includes a UV coloring agent, a fluorine-based polymer and a solvent. In an exemplary embodiment of the invention, the density of the UV coloring agent component is about 100 PPM to about 400 PPM, and the density of the fluorine polymer is about 0.1% by weight to about 0.6% by weight.Type: ApplicationFiled: September 4, 2003Publication date: July 8, 2004Applicants: Minebea Co., Ltd., Noda Screen Co., Ltd.Inventors: Akio Okamiya, Takahiko Ito
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Patent number: 6734590Abstract: A motor that can prevent damages on the fluid dynamic bearing. A ball is press-fitted into the end surface of the shaft body, and the ball is disposed in such a manner that the tip portion of the ball comes to the higher position with respect to the end surface of the annular body. When the shaft is at rest, the ball abuts against the upper surface of the counter plate, and the end surface of the annular body is brought into a state of being raised from the upper surface of the counter plate, so that the situation in which the end surface of the annular body and the upper surface of the counter plate are brought into almost fully touch each other can be avoided. Therefore, when the operation is started, the circulation speed of a fluid increases and a fluid layer is quickly formed. As a consequent, the fluid circularity blocking action, which could be occurred in the relate art, is avoided, and generation of scratch caused by starting rotation in the tightly sticked state can be positively prevented.Type: GrantFiled: April 17, 2002Date of Patent: May 11, 2004Assignee: Minebea Co., Ltd.Inventors: Rikuro Obara, Akio Okamiya
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Patent number: 6559573Abstract: A shaft 2 of a spindle motor is composed of a steel material including 0.20 wt % of C, 0.35 wt % of Si, 8.00 wt % of Mn, higher than 0 and equal to or less than 0.05 wt % of P, 0.15 wt % of S, higher than 0 and equal to or less than 2.00 wt % of Ni and 14.00 wt % of Cr and the remainder substantially being Fe. The steel material has corrosion resistance with no plating requirement and wear resistance with no need for a heat treatment and/or a soft nitriding. Further, when considering a conventionally employed stainless steel, Pb has been frequently added thereto in order to improve machinability. On the contrary, the steel material according to the embodiments of the present invention is Pb-free material. Since the shaft of the spindle motor is manufactured by a material high in its wear resistance, corrosion resistance and workability and in which the generation of the out gas of sulfur and sulfur compounds is suppressed low, the qualities of electronic devices and communication devices, etc.Type: GrantFiled: March 16, 2001Date of Patent: May 6, 2003Assignee: Minebea Co., Ltd.Inventors: Akio Okamiya, Toshisada Koyama
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Publication number: 20030070689Abstract: In order to remove or decrease fine granular sulfide of Mn, Cr, Mo, etc. (Mn—S, Cr—S, Mo—S, etc.) left on a machined workpiece surface of sulfur free-cutting alloy steel without affecting form and dimensional accuracy thereof, there is provided a method for treating the sulfur free-cutting alloy steel which comprises a soaking process of the machined workpiece in a solvent and an ultrasonic cleaning process by applying ultrasonic wave of 1.0 to 2.0 W/cm2 in watt density at frequency of 40 kHz or multi frequency in the solvent.Type: ApplicationFiled: July 18, 2002Publication date: April 17, 2003Inventors: Akio Okamiya, Masato Nasu
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Publication number: 20020047389Abstract: A shaft 2 of a spindle motor is composed of a steel material including 0.20 wt % of C, 0.35 wt % of Si, 8.00 wt % of Mn, higher than 0 and equal to or less than 0.05 wt % of P, 0.15 wt % of S, higher than 0 and equal to or less than 2.00 wt % of Ni and 14.00 wt % of Cr and the remainder substantially being Fe. The steel material has corrosion resistance with no plating requirement and wear resistance with no need for a heat treatment and/or a soft nitriding. Further, when considering a conventionally employed stainless steel, Pb has been frequently added thereto in order to improve machinability. On the contrary, the steel material according to the embodiments of the present invention is Pb-free material.Type: ApplicationFiled: March 16, 2001Publication date: April 25, 2002Applicant: MINEBEA CO., LTD.Inventors: Akio Okamiya, Toshisada Koyama