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1. 发明专利

JPH0943462A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH0943462A
公开(公告)日：1997-02-14
申请号：JP19000595
申请日：1995-07-26
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： IWAKURA DAISUKE , OTAKE AKIHIRO , TANAKA MASAYUKI , HAYAMIZU SHIGEKAZU , IWATA HIDEYUKI , NOZAWA MASARU
IPC分类号： G02B6/44
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber cable capable of diminishing the strain acting on a coated optical fiber ribbon and sufficiently suppressing the transmission loss of this coated optical fiber ribbon. SOLUTION: The coated optical fiber ribbon 15 is housed into a groove 13 of a grooved spacer having the S-Z spiral groove 13. The coated optical fiber ribbon 15 is housed into the groove 13 in such a manner that the ribbon surface faces the groove bottom in the central part (f) between the inverting parts of the groove 13 and that the side edge of the ribbon in the side existing on the outer side of the bend of the groove 13 in the inverting parts faces the groove bottom when the coated optical fiber ribbon is assumed to be housed in the groove 13 in the state of directing the ribbon face toward the groove bottom in the inverting parts (a) (k) of the groove 13.

2. 发明专利

JPH08211261A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH08211261A
公开(公告)日：1996-08-20
申请号：JP3944095
申请日：1995-02-06
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： IWAKURA DAISUKE , OTAKE AKIHIRO , HAYAMIZU SHIGEKAZU , NOZAWA MASARU , IWATA HIDEYUKI
IPC分类号： G02B6/44
摘要： PURPOSE: To suppress the strain of coated fiber ribbons to a lower level and to lessen the transmission loss of the coated fiber ribbons by making the coated fiber ribbons movable within a groove in a direction where the strain is relieved when a cable is bent in such a manner as to reduce the twist applied on the coated fiber ribbons and the bending in the direction of curving the side edges of the ribbons within the ribbon surfaces. CONSTITUTION: The coated fiber ribbons (coated optical fiber ribbons) 15 are housed in the groove 13 of a bar-shaped member 11 with the groove having the groove 13 of an S-Z type. The groove 13 is one piece and the depth of the groove is larger than the radius of the bar-shaped member 11 with the groove. Tension members 21 are embedded by one piece each on both sides of the groove 13. The coated fiber ribbons 15 are housed by directing the ribbon surfaces toward the groove bottom in the central parts between the inverting parts of the groove and by directing the side edges of the ribbons toward the groove bottom in the inverting parts of the groove. All the coated fiber ribbons exist nearer the groove bottom side than two pieces of the tension members 21 in the central parts between the inverting parts of the groove 13.

3. 发明专利

JPH0743571A OPTICAL CABLE 失效
公开(公告)号：JPH0743571A
公开(公告)日：1995-02-14
申请号：JP20357593
申请日：1993-07-26
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MATSUOKA RYUICHI , OKAGAWA SHUJI , OTAKE AKIHIRO , TOMITA SHIGERU
IPC分类号： G02B6/44
摘要： PURPOSE:To prevent an adverse effect on the transmission characteristic of an optical fiber tape from occurring even when the cross-sectional shape of a lengthy body is deformed by modifying the cross-sectional shape of it. CONSTITUTION:An optical fiber unit 4 formed by housing the optical fiber tape 3 in the housing groove 2 of the lengthy body 1 is cabled by arranging the bottom plate 5 of the lengthy body 1 in the periphery of a tension member 6 so that the aperture part 7 of the housing groove 2 can be located at the outside on a tension member 6 side, and the bottom plane 8 of the bottom plate 5 of the lengthy body 1 is formed at a recessed plane protruding over the inside with the same curvature as that of the outer periphery of the tension member 6. Also, the internal plane 9 of the bottom plate 5 of the housing groove 2 of the lengthy body 1 is formed in a recessed plane in which the center part in the width direction of it is recessed than both outsides, and the bottom plate 5 can be deformed so as to be protruded to the inside by pushing by the tension member 6 of the lengthy body 1.

4. 发明专利

JPH05215640A METHOD FOR SCREENING COATED OPTICAL FIBER 失效
公开(公告)号：JPH05215640A
公开(公告)日：1993-08-24
申请号：JP5616392
申请日：1992-02-05
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI HIROYUKI , HARA MASAMI , OKAGAWA SHUJI , OTAKE AKIHIRO , TOMITA SHIGERU
IPC分类号： G01M11/00
摘要： PURPOSE:To prevent the coating film of an optical fiber to be subjected to screening tests from being stripped off or damaged by constituting the surface of a reel with which the coated optical fiber is brought into contact while tension is applied to the optical fiber of a material having a Young's modulus which is lower than a specific value. CONSTITUTION:In the title screening method in which prescribed tension is added to a coated optical fiber which is run between a pair of reels, the hardness (Young's modulus) of reels 5A and 5B for screening and a guide reel 4 largely affect the stripping off or crashing of the coating film of the fiber 1. Therefore, the surfaces of the reels 4, 5A, and 5B with which the fiber 1 are brought into contact while tension is applied to the fiber 1 are constituted of a material having a Young's modulus which is equal to or lower than 1,000kg/mm . As a result, even when the coated optical fiber 1 is brought into contact with one of the reels while a tension load is applied to the fiber l, the coating film of the fiber 1 is hardly stripped off or crashed, because the Young's modulus of the surface of the reel is relatively small, being equal to or lower than 1,000kg/cm .

5. 发明专利

JPH08211263A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH08211263A
公开(公告)日：1996-08-20
申请号：JP3944295
申请日：1995-02-06
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： IWAKURA DAISUKE , OTAKE AKIHIRO , HAYAMIZU SHIGEKAZU , NOZAWA MASARU , IWATA HIDEYUKI
IPC分类号： G02B6/44
摘要： PURPOSE: To obtain a coated optical fiber ribbon which is sufficiently low in the transmission loss of coated optical fiber ribbons and excellent in long-term reliability by reducing the twist applied on the coated optical fiber ribbons and the bending in the direction of curving the side edges of the ribbons within the ribbon surfaces, thereby making it possible to sufficiently suppress the strain of the coated optical fiber ribbons to a low level. CONSTITUTION: The coated optical fiber ribbons 15 are housed in grooves 13 of an S-Z type of a grooved spacer by directing the tape surfaces toward the groove bottoms in the central parts between the inverting parts of the grooves and directing the side edges of the ribbons toward the groove bottoms in the inverting parts of the grooves 13. The inverting pitch P of the grooves satisfies the following equation when the inverting angle of the grooves is defined as θ, the distance from the center of the grooved spacer down to the groove bottoms as (a) and the width of the coated optical fiber ribbons as W: P>=(πθ/180) 200a(W+0.2)-a } (unit in mm).

6. 发明专利

JPH0749437A OPTICAL MULTICORE PLASTIC CONNECTOR 失效
公开(公告)号：JPH0749437A
公开(公告)日：1995-02-21
申请号：JP11467294
申请日：1994-04-28
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： ISO TAKAAKI , TATEGAMI SHIGERU , OTAKE AKIHIRO , HAYASHI TAKEHIRO , SATAKE TOSHIAKI , KASHIMA YOSHIO
IPC分类号： G02B6/38 , G02B6/40
摘要： PURPOSE:To prevent the dispersion of a pin fitting hole, and prevent the increase in clearance by the use of the pin fitting hole by forming the pin fitting hole by a fitting sleeve consisting of a metal or ceramic casted into an optical multicore plastic connector body. CONSTITUTION:A fitting sleeve 20 consisting of a metal or ceramic which has a dropping-out preventing means 19 consisting of a projection on the outer circumference and a pin fitting hole having a prescribed bore diameter in the inner part is used, this is fitted to the outer circumference of a metal master pin 21, and the master pin 21 is positioned in the master pin positioning hole 17 of a metal mold 13, whereby the fitting sleeve 20 is positioned in the mold cavity 14 of the metal mold 13 through the master pin 21. The fitting sleeve 20 is casted to a molded optical multicore plastic connector body 6 together with a core wire protecting bush 5, a core wire coat 3, and an optical fiber 4. The mold is released after the plastic is hardened, and the master pin 21 is pulled out from the fitting sleeve 20 to provide an optical multicore plastic connector.

7. 发明专利

JPH0618752A OPTICAL FIBER CABLE 失效
公开(公告)号：JPH0618752A
公开(公告)日：1994-01-28
申请号：JP12325893
申请日：1993-04-28
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HIDA SUSUMU , OTAKE AKIHIRO , TOMITA SHIGERU
IPC分类号： G02B6/44
摘要： PURPOSE:To prevent a loss from increasing when a cable is bent by rotating a storing member and mitigating a compression distortion when the cable is bent. CONSTITUTION:As to the optical fiber cable formed by spirally winding the storing member 23 for storing plural wide tape-like coated optical fiber 28 laminated in a groove 12 around the outer peripheral surface of a core material 19, the bending rigidity of the storing member 23 in a direction for bending the tape-like coated optical fiber 28 in a width direction is made larger than the bending rigidity in the direction for bending the coated optical fiber 28 in the thickness direction, and also, the storing member 23 can be rotated around the outer circumference of the core material 19. When the cable is bent, the storing member 23 for storing the coated tape-like optical fiber 28 is rotated and the compression distortion applied on the optical fiber especially near the side edge part of the coated optical fiber 28 is mitigated by the rotation of the storing member 23, so that the increase of the loss generated when the cable is bent is prevented.

8. 发明专利

JPS63118106A OBSERVING METHOD FOR OPTICAL FIBER AXIS ALIGNMENT 失效
公开(公告)号：JPS63118106A
公开(公告)日：1988-05-23
申请号：JP26131187
申请日：1987-10-16
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： WATANABE KAZUKI , TATEGAMI SHIGERU , OTAKE AKIHIRO , MATSUMOTO MICHITO
IPC分类号： G02B6/24 , G02B6/38
摘要： PURPOSE:To accurately observe whether the alignment state of optical fibers is proper or not and to improve the observation accuracy by setting a microscope in focus on the ridge part atop a mirror plate. CONSTITUTION:Two optical fiber mount bases 5A and 5B face each other at an interval and the mirror plate 6 is equipped with two mirror surface parts 8A and 8B which slant downward from the ridge part 7 of the top to both sides of the ridge part 7. The mirror plate 6 is interposed between the adjacent parts of both optical fiber mount bases 5A and 5b, and while the end parts 3A and 3B of a couple of optical fibers are arranged on the respective optical fiber mount bases opposite each other, the images of the end surfaces 4A and 4B of those optical fibers are projected on both mirror surface parts 8A and 8B of the mirror plate 6 respectively; and the optical fiber end surface images (a) and (b) projected on both mirror surface parts 8A and 8B are brought into contact with the ridge part 7 of the mirror plate 6, and the relative position between the couple of optical fiber is observed based on the optical fiber end surface images (a) and (b) contacting the ridge part 7. Consequently, whether or not the alignment state is proper is precisely observed in both a vertical and a horizontal directions simultaneously.

9. 发明专利

JPS62100710A CONNECTOR CONNECTING TERMINAL PART FOR SINGLE MODE OPTICAL FIBER CORE AND ITS FORMING METHOD 失效
公开(公告)号：JPS62100710A
公开(公告)日：1987-05-11
申请号：JP24210185
申请日：1985-10-29
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HAYASHI TAKEHIRO , TATEGAMI SHIGERU , WATANABE KAZUNORI , OTAKE AKIHIRO , KATO YASUYUKI
IPC分类号： G02B6/36 , G02B6/38
摘要： PURPOSE:To reduce a connection loss by forming diameter-thinned parts on both the point part of a single mode (SM) optical fiber strand and the point part of a capillary fitted to the outer periphery of the point part of the strand. CONSTITUTION:A coat layer 3 is removed from the end part of the SM optical fiber core 1 to expose a naked SM optical fiber strand 4. Then, the capillary 5 is engaged and fixed with/on the outer periphery of the exposed naked SM optical fiber strand 4, the fitting part of the capillary 5 is heated and the heated part is extended to unitely form the diameter-thinned parts 4A, 5A of the strand 4 and the capillary 5. Then, the diameter-thinned parts 4A, 5As are cut off at the intermediate part and the point side is removed. Consequently, the capillary 5 can be replaced without the damage of the diameter-thinned part 4A and the connection loss can be reduced.

10. 发明专利

JPS6244704A TERMINAL PART FOR CONNECTOR CONNECTION OF SINGLE MODE OPTICAL FIBER CORE 失效
公开(公告)号：JPS6244704A
公开(公告)日：1987-02-26
申请号：JP18527285
申请日：1985-08-23
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HAYASHI TAKEHIRO , TATEGAMI SHIGERU , WATANABE KAZUNORI , OTAKE AKIHIRO , SATAKE TOSHIAKI , MIKAWA IZUMI
IPC分类号： G02B6/36
摘要： PURPOSE:To reduce connection loss by forming a diameter-reduced tip part atop of a single mode (SM) optical fiber element wire and reinforcing the part from the diameter-reduced part to a coating layer behind it with a mold reinforcing body. CONSTITUTION:The SM optical fiber core 1 has its coating layer 2 removed at its end part and the bare SM optical fiber element wire 3 of

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