Patents by Inventor Yuji Shinagawa
Yuji Shinagawa 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: 6886990Abstract: An optical connector has a ferrule comprises of a cylindrical body for supporting an optical fiber, and a flange member having an end portion connected to a first end of the cylindrical body and a flange part projecting from the end portion. A holding member supports the ferrule and has an engaging part. A rotation positioning part is formed in the flange part of the flange member for positioning the flange part relative to the holding member to provide a first clearance between the rotation positioning part and the engaging part of the holding member for restricting rotation of the ferrule about the fiber optical axis relative to the holding member. A rotation allowing part is formed in the flange part of the flange member and spaced from the engaging part of the holding member to provide a second clearance therebetween greater than the first clearance for allowing rotational movement of the ferrule so as to permit the ferrule to incline in a direction transverse to an axis of the optical connector.Type: GrantFiled: May 8, 2003Date of Patent: May 3, 2005Assignees: Seiko Instruments Inc., Nippon, Telegraph and Telephone Corporation, Sanwa Denki Kogyo Co., Ltd.Inventors: Junji Taira, Kouji Minami, Ryo Nagase, Syuichi Yanagi, Shuichiro Inagaki, Taisei Miyake, Yuji Shinagawa, Masaji Suwabe, Hidekazu Onouchi
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Patent number: 6776535Abstract: A plug frame for an optical connector component comprising a ferrule for receiving an end portion of a core optical fiber of a fiber optic cable and a plug frame for floatingly supporting the ferrule. The plug frame is configured as a one-piece component. This allows reduction of the number of component parts and assembling steps, simplification of the assembling operations and reduction of the manufacturing cost.Type: GrantFiled: March 1, 2002Date of Patent: August 17, 2004Assignees: Hirose Electric Co., Ltd., Nippon Telegraph and Telephone Corporation, Honda Tsushin Kogyo Co., Ltd., Sanwa Denki Kogyo Co., Ltd.Inventors: Yukinori Miyake, Takumi Yoshida, Shin Sumida, Shuichi Yanagi, Yasuaki Ohkubo, Toshiaki Nakano, Yuji Shinagawa, Tatsuhito Shinozaki
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Patent number: 6652156Abstract: An optical connector plug includes a holder having a ferrule at one end thereof, a stop ring for supporting the ferrule in a predetermined direction, a plug frame for rotatably supporting and incorporating the stop ring in an axial direction, and a coil spring interposed between the holder and the stop ring, for energizing the ferrule to the front in the plug frame, wherein the holder and the stop ring have engaging portions with which they are mutually engaged, and an optical axis of the ferrule is adjusted in a single step by rotating the stop ring and fixing the plug frame or by rotating the plug frame and fixing the stop ring, and an adjusted position is fixed by pressure generated by pressing the spring to the holder and by using an adhering agent which is filled between the plug frame and the stop ring.Type: GrantFiled: October 31, 2001Date of Patent: November 25, 2003Assignees: Sanwa Denki Kogyo Co., Ltd., Yonezawa Densen Co., Ltd.Inventors: Yuji Shinagawa, Koji Ozaki, Mikio Hojo, Daisuke Hayasaka, Satoru Nozawa, Ryosuke Kudo
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Publication number: 20030215191Abstract: Provided is a PC connector to be removed of useless stress during attached/detached thus being stably attached/detached. A flange part is provided in a polygonal or disk form circumferentially projecting on the flange member at a tip side thereof. In a holding part holding the flange member, an engaging part is formed axially of the optical fiber and in a predetermined engaging width. The flange part has a predetermined clearance to the engaging part at an axial tip side thereof. A rotation positioning part restricts a movement in rotational direction of the flange part. A rotation allowing part is provided to form, on a rear-end side of the rotation positioning part, a clearance greater than the clearance of between the rotation positioning part and the engaging part.Type: ApplicationFiled: May 8, 2003Publication date: November 20, 2003Inventors: Junji Taira, Kouji Minami, Ryo Nagase, Syuichi Yanagi, Shuichiro Inagaki, Taisei Miyake, Yuji Shinagawa, Masaji Suwabe, Hidekazu Onouchi
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Publication number: 20020159717Abstract: Disclosed is a plug frame 33 for an optical connector component 31 comprising a ferrule 2 for receiving an end portion of a core optical fiber of a fiber optic cable and a plug frame 33 for floatingly supporting the ferrule 2. According to the present invention the plug frame 33 is configured as a one-piece component. This allows reduction of the number of component parts and assembling steps, simplification of the assembling operations and reduction of the manufacturing cost.Type: ApplicationFiled: March 1, 2002Publication date: October 31, 2002Applicant: Hirose Electric Co., LtdInventors: Yukinori Miyake, Takumi Yoshida, Shin Sumida, Shuichi Yanagi, Yasuaki Ohkubo, Toshiaki Nakano, Yuji Shinagawa, Tatsuhito Shinozaki
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Publication number: 20020085815Abstract: An optical connector plug includes a holder having a ferrule at one end thereof, a stop ring for supporting the ferrule in a predetermined direction, a plug frame for rotatably supporting and incorporating the stop ring in an axial direction, and a coil spring interposed between the holder and the stop ring, for energizing the ferrule to the front in the plug frame, wherein the holder and the stop ring have engaging portions with which they are mutually engaged, and an optical axis of the ferrule is adjusted in a single step by rotating the stop ring and fixing the plug frame or by rotating the plug frame and fixing the stop ring, and an adjusted position is fixed by pressure generated by pressing the spring to the holder and by using an adhering agent which is filled between the plug frame and the stop ring.Type: ApplicationFiled: October 31, 2001Publication date: July 4, 2002Inventors: Yuji Shinagawa, Koji Ozaki, Mikio Hojo, Daisuke Hayasaka, Satoru Nozawa, Ryosuke Kudo
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Patent number: 5563978Abstract: The sleeve holder for an optical connector capable of preventing slip-off or disconnecting of the sleeve holder from a housing and eliminating breaking of a split sleeve due to the increase of an insertion force of the ferrule by maintaining always no-load state for engaging pieces. A tube-shaped main body inserted and held in the housing is mounted therein with a slider slidable in an axis direction. A split sleeve inserting and holding the ferrule is mounted at the insides of a tube body and the slider fixedly engaged coaxially with the main body, and such mount of the split sleeve together with the slider is slidable by a predetermined stroke in the axis direction.Type: GrantFiled: June 20, 1994Date of Patent: October 8, 1996Assignees: Sanwa Denki Kogyo Company Limited, Nippon Telegraph and Telphon Corporation, Honda Tsushin Kogyo Company LimitedInventors: Akira Kawahara, Yuji Shinagawa, Shin'ichi Iwano, Kazunori Kanayama, Yasuhiro Ando, Toshiaki Nakano, Hiromasa Okamura
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Patent number: 5023524Abstract: In a grid drive-type CRT display apparatus, the impedance of a second grid voltage supply circuit is made a high impedance and a low-frequency band rejecting streaking interference caused by the high impedance is compensated by low-frequency range emphasizing circuit means. The low-frequency range emphasizing circuit means compensates for the low-frequency range rejection characteristic which is an adverse effect of the high impedance to the second grid and this results in an improvement in the high-frequency transmission characteristic. Also, there is the effect of improving the frequency bandwidth and reducing the consumption of power.Type: GrantFiled: August 16, 1989Date of Patent: June 11, 1991Assignee: Hitachi, Ltd.Inventors: Masanori Ogino, Tsuneo Fujikura, Yuji Shinagawa, Takeo Yamada