Patents by Inventor Mikio Yoshinuma
Mikio Yoshinuma 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: 6467973Abstract: The present invention discloses an optical fiber fusion splicer which, together with fusing and splicing optical fibers in the state in which the jacket of each optical fiber core is clamped by being provided with a means by which a V-shaped groove base is moved up and down so that the axial centers of optical fiber cores are positioned at the proper position for electrical discharge, is provided with a mechanism that temporarily moves clamp upward and V-shaped groove base downward followed by re-clamping in order to eliminate a lift-up phenomenon during rotation alignment of the constant polarization optical fibers.Type: GrantFiled: June 18, 2001Date of Patent: October 22, 2002Assignee: Fujikura LTDInventors: Kenji Takahashi, Noriyuki Kawanishi, Mikio Yoshinuma
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Publication number: 20010053268Abstract: The present invention discloses an optical fiber fusion splicer which, together with fusing and splicing optical fibers in the state in which the jacket of each optical fiber core is clamped by being provided with a means by which a V-shaped groove base is moved up and down so that the axial centers of optical fiber cores are positioned at the proper position for electrical discharge, is provided with a mechanism that temporarily moves clamp upward and V-shaped groove base downward followed by re-clamping in order to eliminate a lift-up phenomenon during rotation alignment of the constant polarization optical fibers.Type: ApplicationFiled: June 18, 2001Publication date: December 20, 2001Inventors: Kenji Takahashi, Noriyuki Kawanishi, Mikio Yoshinuma
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Patent number: 5735013Abstract: The present application discloses an apparatus and a method of cleaning an optical fiber, which comprise a cleaning area where an optical fiber is placed between a first tape-shaped cleaning member and a second tape-shaped cleaning member; a first passing line, which is arranged in the cleaning area through which the first tape-shaped cleaning member passes; and a second passing line, which is arranged in the cleaning area and faces the first passing line, through which the second tape-shaped cleaning member passes.Type: GrantFiled: April 12, 1996Date of Patent: April 7, 1998Assignees: Fujikura Ltd., Tokki CorporationInventors: Shonosuke Yaguchi, Mikio Yoshinuma, Akinobu Kubota, Yoshitake Tomomura
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Patent number: 5457765Abstract: An apparatus for adjusting the alignment of the optical fibers at a high precision, formed by a base frame having a plurality of pairs of V-grooves for mounting the optical fibers at mutually facing sides of the base frame, each V-groove being defined by a fixed member and a movable member, each movable member being movable within a guide groove defined between each adjacent fixed members, and one of each pair of V-grooves on one of the mutually facing sides has the fixed member and the movable member facing against the movable member and the fixed member, respectively, of another one of each pair of V-grooves on another one of the mutually facing sides; and a plurality of piezoelectric elements, each of which is connected with each movable member of each V-groove, for causing each movable member to move within the guide groove such that a displacement of each movable member makes an adjustment of a position of an optical fiber mounted on each V-groove.Type: GrantFiled: August 25, 1994Date of Patent: October 10, 1995Assignees: Fujikura Ltd., Nippon Telegraph and Telephone CorporationInventors: Isao Suzuki, Yasuo Suzuki, Kenji Takahashi, Michio Morooka, Mikio Yoshinuma, Shinichi Aoshima
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Patent number: 5296679Abstract: A method of fusion splicing optical fibers. Cores of the optical fibers to be fusion spliced are arranged in such a manner that the ends of the corresponding cores of optical fibers opposingly face to each other between discharge electrodes for fusion splicing. Discharge current flowing between the discharge electrodes is automatically adjusted according to a number of the cores of the optical fibers to substantially provide an optimal correction to the discharge current in relation to the number of the cores of the optical fibers. The discharge current is further adjusted to a variation in atmospheric pressure to substantially provide an optimal correction to the discharge current in relation to the variation in atmospheric pressure.Type: GrantFiled: August 11, 1993Date of Patent: March 22, 1994Assignee: Fujikura Ltd.Inventors: Isao Suzuki, Hiroyuki Kawasaki, Michio Morooka, Mikio Yoshinuma
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Patent number: 5170456Abstract: An apparatus for aligning a plurality of single-fiber cables, comprises a base, a cover hinged to the base and forming a gap along with the base when closed, and a pair of arms inserted in the gap and movable within the gap, for aligning the single-fiber cables in the same plane. To align single-fiber cables by means of the apparatus, the cables are arranged on the base, one after another. Then, the cover is closed, whereby the cables are located in the gap between the base and the cover. The arms or the pawl members, which are inserted in the gap, are moved, thereby putting the cables together and placing them parallel to one another in the same plane, any cable not forced above so that it rides atop another. The cables, thus aligned, can easily be held by a holder designed for multi-fiber cables.Type: GrantFiled: June 25, 1991Date of Patent: December 8, 1992Assignee: Fujikura Ltd.Inventors: Kenichiroh Itoh, Mikio Yoshinuma
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Patent number: 5163988Abstract: In a method of preventing twisting of a fusion-spliced optical fiber in the process of encasing the optical fiber in a casing, one of a pair of optical fibers is wound N turns in one direction to form a first coil. Another of the pair of optical fibers is wound N turns in another direction opposite to the direction to form a second coil. Ends of remainder portions of the optical fibers which are not wound are fusion-spliced to each other to form a fusion-spliced portion. The fusion-spliced portion is fixed within a casing. The remainder portions of the optical fibers are pushed into the casing to expand the first and second coils.Type: GrantFiled: December 26, 1990Date of Patent: November 17, 1992Assignees: Fujikura Ltd., Nippon Telegraph & Telephone CorporationInventors: Yukio Setaishi, Mikio Yoshinuma, Masao Ooba
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Patent number: 5156663Abstract: An apparatus for fushion splicing optical fiber with three pairs at clamps; the outermost pair of clamps has one rotatable clamp mechanism that is manually operated and a second rotatable clamp mechanism that is operated by a motor. A rapid fine adjustment of the alignment of the polarization maintaining optical fibers can be made.Type: GrantFiled: April 16, 1991Date of Patent: October 20, 1992Assignees: Fujikura Ltd., Nippon Telegraph & Telephone CorporationInventors: Keinichiro Itoh, Takeshi Yamada, Tsutomu Onodera, Mikio Yoshinuma, Yasuyuki Kato
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Patent number: 5149350Abstract: An apparatus for fusion splicing optical fibers has one rotatable clamp mechanism that is manually operated and a second rotatable clamp mechanism that is operated by a motor. A three position stopper functions in the first position as a stopper against the optical fibers when the optical fibers are moved toward each other and in the second position as a mirror for reflecting an image of respective end faces of the optical fibers. A rapid fine adjustment of the alignment of the polarization maintaining optical fibers can be made.Type: GrantFiled: December 26, 1990Date of Patent: September 22, 1992Assignees: Fujikura Ltd., Nippon Telegraph & Telephone CorporationInventors: Kenichiro Itoh, Takeshi Yamada, Tsutomu Onodera, Mikio Yoshinuma, Yasuyuki Kato
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Patent number: 5147434Abstract: An apparatus for fusion splicing optical fibers has one rotatable clamp mechanism that is manually operated, a second rotatable clamp mechanism that is operated by a motor and a twist preventing means removably coupled to the apparatus with an arm member. A rapid fine adjustment of the alignment of the polarization maintaining optical fibers can be made.Type: GrantFiled: April 16, 1991Date of Patent: September 15, 1992Assignees: Fujikura Ltd., Nippon Telegraph & Telephone CorporationInventors: Kenichiro Itoh, Takeshi Yamada, Tsutomu Onodera, Mikio Yoshinuma, Yasuyuki Kato
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Patent number: 5046813Abstract: An apparatus for aligning a plurality of single-fiber cables, comprises a base, a cover hinged to the base and forming a gap along with the base when closed, and a pair arms inserted in the gap and movable within the gap, for aligning the single-fiber cables in the same plane. To align single-fiber cables by means of the apparatus, the cables are arranged on the base, one after another. Then, the cover is closed, whereby the cables are located in the gap between the base and the cover. The arms or the pawl members, which are inserted in the gap, are moved, thereby putting the cables together and placing them parallel to one another in the same plane, any cable not forced above so that it rides atop another. The cables, thus aligned, can easily be held by a holder designed for multi-fiber cables.Type: GrantFiled: September 1, 1989Date of Patent: September 10, 1991Assignee: Fujikura Ltd.Inventors: Kenichiroh Itoh, Mikio Yoshinuma
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Patent number: 5024501Abstract: The present invention discloses a manufacturing method for polarization maintaining optical fiber couplers which are used for joining light signals and at optical fiber branch points. The disclosed manufacturing method employs polarization maintaining optical fibers, and describes a method for mutually aligning the stress applying parts of such optical fibers so that polarized optical signals are maintained in the polarized state when transiting such couplers.Type: GrantFiled: April 9, 1990Date of Patent: June 18, 1991Assignee: Fujikura Ltd.Inventors: Hiroyuki Taya, Mikio Yoshinuma, Takeshi Yamada, Kenji Nishide, Fumio Suzuki, Hirohisa Fujimoto, Ryozo Yamauchi
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Patent number: 4986843Abstract: An apparatus for fusion splicing optical fibers has one rotatable clamp mechanism that is manually operated and a second rotatable clamp mechanism that is operated by a motor. A rapid fine adjustment of the alignment of the polarization maintaining optical fibrs can be made.Type: GrantFiled: July 11, 1989Date of Patent: January 22, 1991Assignees: Fujikura Ltd., Nippon Telegraph and Telephone CorporationInventors: Kenichiro Itoh, Takeshi Yamada, Tsutomu Onodera, Mikio Yoshinuma, Yasuyuki Kato
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Patent number: 4911524Abstract: .theta.-clamp also serves as a jacket clamp. The clamp comprises a cover mounted on an arm by a hinge and kept closed by a magnet, so that a pusher provided in the cover is urged against a jacketed portion of an optical fiber by a spring. In this state, the fiber is rotated in a .theta. direction by rotating a dial. .theta.-clamp also serves as a jacket clamp. Therefore, 1. The .theta.-clamp can be positioned close to a fiber clamp. For this reason, the optical fiber is not twisted during .theta.-axes alignment, and a follow-up property of rotation of the optical fiber with respect to rotation of the .theta. axis is improved. In addition, the apparatus need not be adjusted so as not to twist the optical fiber. 2. The distance between fiber clamp and .theta.-clamp is shortened. Therefore, when the optical fiber is clamped and moved in the z direction, the jacketed portion is not flexed.Type: GrantFiled: May 23, 1989Date of Patent: March 27, 1990Assignee: Fujikura Ltd.Inventors: Kenichiroh Itoh, Mikio Yoshinuma, Naomichi Suzuki, Takeshi Yamada, Hiroyuki Taya