Patents by Inventor Yoshiki Fujii
Yoshiki Fujii 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: 6676132Abstract: The object of the present invention is to improve sealing performance of a seal under a specific environment. The seal is arranged in an annular space A in which a rotary shaft 1 and a housing 2 face each other, and partitions the annular space in axial direction into a vacuum space B and an atmospheric pressure space C. The seal is constituted such that a main lip 6 of the seal has an axial contact width W0 with which the main lip slides on and contacts with the rotary shaft 1 and which is set to be equal to or larger than an axial contact width W1 necessary to secure minimum sealing performance with respect to a sealed portion and equal to or smaller than an axial contact width W2 with which sliding resistance against the rotary shaft becomes a permissible upper limit, to thereby prevent the axial contact width W0 from influencing rotation characteristics with respect to the rotary member and to allow securing required sealing performance.Type: GrantFiled: May 23, 2001Date of Patent: January 13, 2004Assignees: Kojo Seiko Co., Ltd., Teijin Seiki Co., Ltd.Inventors: Hiroaki Takebayashi, Kazunori Hayashida, Kazutoshi Yamamoto, Yoshiki Fujii, Shinichi Ohbayashi, Yishihiro Yano
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Publication number: 20030169418Abstract: In a substrate inspecting apparatus comprising a projecting section (4) in which light sources (8), (9) and (10) are provided for emitting colored lights of R, G and B in directions having different elevation angles, one or two color components which is/are greater than the mean value of the intensities of color components is/are extracted for an inspecting region including a soldered portion. Inclined surfaces adapted to the light sources (8), (9) and (10) are converted into monochromatic shaded images by the extraction processing. A boundary position between the inclined surfaces adapted to the light sources (8) and (9) are converted into one shaded image having a mixed color of red and green and the boundary position between the inclined surfaces adapted to the light sources (9) and (10) is converted into a different shaded image.Type: ApplicationFiled: January 8, 2003Publication date: September 11, 2003Applicant: OMRON CORPORATIONInventors: Yoshiki Fujii, Kiyoshi Murakami
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Publication number: 20030099393Abstract: A circuit board with lead-free solder is inspected by using light sources with different colors at different angles to obtain an image having a plurality of color components. For each pixel within an area in the obtained image, the brightness of a white component generated by mixing all of the color components is extracted. The brightness of each of the color components of each pixel is reduced by an amount corresponding to the extracted brightness of the white component and is adjusted such that the brightest of the color components becomes more strongly emphasized compared to the others, than the brightness before the brightness-reducing process was carried out and the loss in total brightness caused by the brightness-reducing process is restored. The image with restored brightness is displayed and the surface condition of the solder is judged on the basis of the distributions of the color components of this image.Type: ApplicationFiled: November 18, 2002Publication date: May 29, 2003Applicant: OMRON CorporationInventors: Akira Oshiumi, Yoshiki Fujii, Yujin Fujita
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Publication number: 20030052199Abstract: A spray nozzle has a nozzle tip removably installed on a main body of the spray nozzle at a spray side thereof. The nozzle tip has a flow path communicating a spray port disposed on a front-end surface with an inlet port disposed at a rear-end surface along an axis of the nozzle tip. A throat portion is provided on the flow path of the nozzle tip in a range from the inlet port to the spray port. The sectional configuration of the flow path in a range from the inlet port to the throat portion is circular or elliptic, and a sectional area of the flow path decreases gradually from the inlet port to the throat portion.Type: ApplicationFiled: September 11, 2002Publication date: March 20, 2003Applicant: H. IKEUCHI & CO., LTD.Inventors: Hiroshi Ikeuchi, Norio Onishi, Yoshiki Fujii
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Patent number: 6532662Abstract: According to this dynamic pressure groove processing method, dynamic pressure grooves are formed in specified regions by electrochemical machining with the electrode of an electrode tool put close to a workpiece in the initial stage. Through this electrochemical machining, corners of land portions adjacent to the dynamic pressure grooves can be curved and smoothed. Next, by subjecting the workpiece to electrochemical machining with the electrode of the electrode tool put away from the workpiece, the land portions are to undergo weak electrochemical machining. Surface roughness of surfaces of the land portions can be reduced, and the curved corners of the land portions can be made smoother at the same time. Therefore, the abrasion resistance characteristic of the dynamic pressure grooves can be improved further than that achieved by the conventional electrochemical machining, allowing the abrasion resistance characteristic and reliability to be sufficiently improved.Type: GrantFiled: March 12, 2001Date of Patent: March 18, 2003Assignee: Koyo Seiko Co., Ltd.Inventors: Yasuhiro Kobayashi, Yoshiki Fujii, Takeshi Takahashi
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Patent number: 6371651Abstract: It is an object of the invention to provide a thrust dynamic pressure bearing in which an unsymmetrical contact during rotation is prevented from occurring, and a dynamic pressure space is prevented from being clogged with abrasion powder generated by a contact at starting and stopping. In the thrust dynamic pressure bearing of the invention, a flange disposed on a shaft is tapered as moving form toward the outer circumference thereof, so that a dynamic pressure space between a thrust bearing face of a housing and a thrust receiving face of the shaft during rotation becomes wider toward the outer circumference thereof. Even if the shaft is tilted with respect the housing during rotation, therefore, it is possible to prevent an unsymmetrical contact of the thrust receiving face of the shaft in the vicinity of the circumference against the thrust bearing face of the housing, from occurring.Type: GrantFiled: December 7, 1999Date of Patent: April 16, 2002Assignee: Koyo Seiko Co., Ltd.Inventors: Yoshiki Fujii, Takeshi Takahashi
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Publication number: 20010027924Abstract: According to this dynamic pressure groove processing method, dynamic pressure grooves are formed in specified regions by electrochemical machining with the electrode of an electrode tool put close to a workpiece in the initial stage. Through this electrochemical machining, corners of land portions adjacent to the dynamic pressure grooves can be curved and smoothed. Next, by subjecting the workpiece to electrochemical machining with the electrode of the electrode tool put away from the workpiece, the land portions are to undergo weak electrochemical machining. Surface roughness of surfaces of the land portions can be reduced, and the curved corners of the land portions can be made smoother at the same time. Therefore, the abrasion resistance characteristic of the dynamic pressure grooves can be improved further than that achieved by the conventional electrochemical machining, allowing the abrasion resistance characteristic and reliability to be sufficiently improved.Type: ApplicationFiled: March 12, 2001Publication date: October 11, 2001Inventors: Yasuhiro Kobayashi, Yoshiki Fujii, Takeshi Takahashi
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Patent number: 6027333Abstract: With respect to a radiant tube burner to be used for heating a heating furnace or the like, to suppress the generation of NOx accompanying combustion, to make the structure thereof fit for a radiant tube burner equipment, to simplify the control of a fuel supply system and an air supply system, and to prevent the coking. Furthermore, to provide a combustion control scheme appropriate to a radiant tube burner. For these purposes, the present invention placed the respective tips of a fuel nozzle, e.g., pilot burner joint-use nozzle (11), and an air throat (13) in the end of a radiant tube (3) and moreover has a combustion air injection port (33) of the air throat (13) provided to be deviated in contact with or near to the inner circumferential wall surface of the radiant tube (3). In addition, a control device (307) for making a burner burn alternately.Type: GrantFiled: May 23, 1996Date of Patent: February 22, 2000Assignees: NKK Corporation, Japan & Nippon Furnace Kogyo Kaisha, Ltd.Inventors: Yoshiki Fujii, Toshio Ishii, Shunichi Sugiyama, Ryoichi Tanaka, Mamoru Matsuo, Makoto Miyata, Shigeo Kurioka, Hiroaki Sato, Akinori Hokabori, Toshikazu Akiyama
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Patent number: 5516214Abstract: The outer surface of a rolling element (3) of a rolling bearing is coated with a lubricating film (4) having three layers (5, 6, 7). The bottommost layer (5) coated on the surface of the rolling element (3) is made of Sn; the intermediate layer (6) coated on the surface of the bottommost layer (5) is made of Ag; and the topmost layer (7) coated on the surface of the intermediate layer (6) is made of Pb. As a result of this construction, Ag serves as a binder between the Pb-Sn alloy and steel constituting an inner race member (1), an outer race member (2) and/or the rolling element (3), which in turn renders the lubricating film (4) wettable with respect to the surfaces of the inner and outer race members (1, 2) defining a race and the outer surface of the rolling element (3). Hence, stable lubrication between the bearing components can be implemented.Type: GrantFiled: December 22, 1994Date of Patent: May 14, 1996Assignee: Koyo Seiko Co., Ltd.Inventors: Kenichi Kakumoto, Hiroaki Takebayashi, Yoshiki Fujii, Tatsumi Hioki, Hirozumi Azuma