JP5376037B2 - Fiber optic fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber fixture which reduces an air flow from being disturbed, is capable of corresponding to various optical fiber laying styles and can also easily deal with a facility change. <P>SOLUTION: An optical fiber fixture 70 comprises a ring-shaped fiber guide 71, engaging parts 73 which are protruded from the fiber guide 71 in a direction parallel to a center axis of the fiber guide 71 and freely attachable to and detachable from a support member, and fall prevention parts 72 which prevent an optical fiber from falling. The fiber guide 71, the engaging parts 73 and the fall prevention parts 72 are integrally formed from resin. The engaging parts 73 are disposed at two positions where a first straight line passing a ring center crosses the fiber guide 71, respectively, and the fall prevention parts 72 are disposed at two positions where a second straight line passing the ring center and crossing the first straight line crosses the fiber guide 71, respectively. Furthermore, in a view from an infinitely far end on a straight line connecting the two engaging parts 73, a gap is visible between the engaging parts 73 and the fall prevention parts 72. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an optical fiber fixture used when laying an optical fiber.

  In recent years, a large number of computers (servers, etc.) such as data centers that manage and operate customer information and computer centers that handle a large amount of jobs (JOBs) (hereinafter collectively referred to as “data centers”) Are often installed and managed in the same room.

  In a data center, a large number of racks are installed in a room, and a plurality of computers are stored in each rack. Under such circumstances, a large amount of heat is generated from the computer and the temperature in the rack rises, causing malfunction or failure. For this reason, the indoor temperature is controlled by using an air conditioner so that the indoor temperature is not increased by heat exhausted from the rack while the indoor cool air is taken into the rack by a fan or the like to cool the computer.

  By the way, the amount of heat generated from the computer varies greatly depending on the operating state of the computer. In order to reliably prevent a malfunction or failure of the computer due to heat, it is necessary to use a cooling device (such as an air conditioner and a fan) having a cooling capacity corresponding to the maximum amount of heat generated from the computer.

In this case, it is not preferable to always operate a cooling device having a large cooling capacity at its maximum capacity, not only from the viewpoint of increasing the running cost but also from the viewpoint of energy saving and CO ₂ reduction. Therefore, it is necessary to measure the temperature of each rack installed in the data center in real time and optimize the cooling based on the measurement result.

  Conventionally, it has been proposed to use an optical fiber as a temperature sensor when measuring temperatures (temperature distributions) at a number of locations (measurement points) in data centers, factories, offices, and the like. Various optical fiber fixtures used when laying optical fibers have also been proposed.

JP 2008-43056 A JP 2003-248125 A JP 2000-137120 A JP 2006-215435 A JP 2007-174724 A

Fujitsu Laboratories Ltd. PRESS RELEASE "Development of real-time multi-point temperature measurement technology for data centers" April 4, 2008

  The fixing device for the temperature measuring optical fiber is required not to obstruct the air flow as much as possible in order to accurately measure the temperature of the air, and to be inexpensive because it is used in a large amount. In addition, it is also required to be able to cope with various laying forms of optical fibers such as a circular shape (coil shape) and an 8-shaped shape. Furthermore, it is required to be detachable so that it can easily cope with changes in equipment.

  Accordingly, it is an object of the present invention to provide an optical fiber fixture that can be manufactured at a low cost with less obstruction of the air flow, can be applied to various optical fiber laying configurations, and can easily cope with changes in equipment. To do.

According to one aspect of the disclosed technology, a fiber guide that is a ring-shaped member and supports an optical fiber in a state of being curved in a circular arc or a coil along a peripheral surface, and a central axis of the fiber guide from the fiber guide And an detachable engaging part that prevents the optical fiber from falling off, and the fiber guide, the engaging part, and the detaching preventing part are made of resin. The engaging portion is formed at two positions where a first straight line passing through the ring center of the fiber guide intersects the fiber guide, and the drop-off preventing portion passes through the ring center and is second straight line are respectively disposed on two positions intersecting the fiber guide intersecting the first straight line, the engaging portion and the disengagement prevention part is die Bro used in molding It includes a gap that can be in the opposite direction all the drawing direction of the click in the same direction or another, the clearance of the engagement portion and the disengagement prevention part when viewed from the infinite distance on a straight line connecting two of said engaging portion A visible fiber optic fixture is provided.

  The optical fiber fixture according to the one aspect includes a ring-shaped fiber guide and an engaging portion that protrudes from the fiber guide in a direction parallel to the central axis of the fiber guide. For this reason, there are few parts which obstruct the flow of the air of the direction parallel to the center axis | shaft of a fiber guide, and the temperature of the flowing air can be measured accurately.

  The optical fiber fixture according to the above aspect has a fiber guide, an engaging portion, and a drop-off preventing portion integrally formed of resin, and can be manufactured in large quantities and at low cost by injection molding or the like. Furthermore, by utilizing the shape of the fiber guide, the optical fiber can be laid in a circular shape or a figure-eight shape, and the laying direction can be bent by, for example, 90 °, so that various laying configurations can be supported. Furthermore, since the engaging part is detachable from the support member, the optical fiber fixture according to the above aspect can easily cope with a change in equipment.

FIG. 1 is a perspective view (No. 1) showing an optical fiber fixture according to the first embodiment. FIG. 2 is a perspective view (No. 2) showing the optical fiber fixture according to the first embodiment. FIG. 3 is a top view of the optical fiber fixture. FIG. 4A is a view showing a cross section of the fiber guide of the optical fiber fixture, and FIG. 4B is a view showing an end face of the fiber guide. FIG. 5 is a view showing the hook of the optical fiber fixture. FIG. 6 shows the direction of removing the mold block at the part forming the groove of the fiber guide, the direction of removing the mold block at the part forming the protrusion, and the part of the mold block forming the hinge part of the hook. It is a figure which shows a direction. FIG. 7 is a diagram illustrating an example of a server rack. FIG. 8 is a view (No. 1) showing a state in which an optical fiber fixing tool is attached to a punching metal of an opening / closing door. FIG. 9 is a diagram (No. 2) illustrating a state in which the optical fiber fixing tool is attached to the punching metal of the opening / closing door. FIGS. 10A to 10C are diagrams illustrating examples of laying optical fibers. FIG. 11 is a diagram illustrating an optical fiber fixture according to the second embodiment. FIGS. 12A and 12B are schematic views showing the change in the shape of the hook when the optical fiber fixture of the second embodiment is attached to the punching metal. FIG. 13 is a view showing a modification of the second embodiment, and is a view showing an example in which a rotation preventing portion (engagement assisting member) is provided. FIGS. 14A and 14B are views showing a modification of the second embodiment and showing an example in which the hinge portion is formed horizontally. FIG. 15 is a perspective view showing an optical fiber fixture according to the third embodiment. FIG. 16 is a top view showing an optical fiber fixture according to the fourth embodiment. FIG. 17A is a view showing an end face of an optical fiber fixture (fiber guide), and FIG. 17B is a cross-sectional view taken along the line II of FIG. FIG. 18 is a top view showing a modification of the optical fiber fixture of the fourth embodiment. FIG. 19 is a perspective view showing an optical fiber fixture according to the fifth embodiment. FIGS. 20A to 20C are schematic views showing a state in which an optical fiber is supported by a guide post. FIGS. 21A and 21B are perspective views showing an optical fiber fixture according to the sixth embodiment. FIG. 22 is a perspective view showing a state in which an optical fiber is arranged in the optical fiber fixture of the sixth embodiment. FIG. 23 is a diagram illustrating a state when the optical fiber fixture is viewed from an infinite distance on a straight line connecting two hooks in the optical fiber fixture according to the sixth embodiment. FIG. 24 is a schematic diagram (part 1) illustrating a state in which the optical fiber fixture of the sixth embodiment is attached to a punching metal. FIG. 25 is a schematic diagram (part 2) illustrating a state in which the optical fiber fixture of the sixth embodiment is attached to a punching metal. FIGS. 26A and 26B are perspective views showing an optical fiber fixture according to the seventh embodiment.

  Hereinafter, embodiments will be described with reference to the accompanying drawings.

(First embodiment)
1 and 2 are perspective views showing the optical fiber fixture according to the first embodiment, and FIG. 3 is a top view of the optical fiber fixture. 4A is a view showing a cross section of the fiber guide of the optical fiber fixture, FIG. 4B is a view showing the end face of the fiber guide, and FIG. 5 is a view showing a hook.

  The optical fiber fixture 10 according to the present embodiment is made of synthetic resin (plastic), and has a fiber guide 11 and a hook (engagement portion) 12 as shown in FIG.

  As can be seen from FIGS. 1 to 3, the fiber guide 11 has a shape in which a thin rod having a substantially rectangular cross section is curved along an arc of a circle having a radius r centering on a point A (center of curvature). Yes. The angle θ formed by two straight lines connecting the center of curvature A shown in FIG. 3 and both ends of the fiber guide 11 is larger than 90 ° and smaller than 180 ° (90 ° <θ <180 °). preferable. In the optical fiber fixture 10 of the present embodiment, θ is set to 120 °.

  A groove 11a extending in the circumferential direction is formed on the outer peripheral surface of the fiber guide 11, and the optical fiber is arranged in the groove 11a and bent in an arc shape. As shown in FIG. 4A, the width (opening width) W of the groove 11a is set slightly larger than the diameter of the optical fiber 15, and 1 to several (two in the example of FIG. 4) are formed in the groove 11a. ) Optical fiber 15 can be arranged.

  Hereinafter, the surface of the fiber guide 11 that contacts the optical fiber 15 to determine the curvature of the optical fiber 15 (the surface closest to the center of curvature A among the surfaces that contact the optical fiber 15) is referred to as a fiber support surface. In the optical fiber fixture 10 of the present embodiment, the bottom surface of the groove 11a is the fiber support surface. In the optical fiber fixture 10 of the present embodiment, the radius of curvature at the fiber support surface is set to 22.5 mm.

  At both ends of the fiber guide 11, as shown in FIGS. 2 and 4B, there are provided protrusions (drop-off prevention portions) 11b for preventing the optical fiber 15 from coming off the groove 11a. As shown in FIG. 3, the protrusion 11 b has a substantially triangular shape with a straight line connecting the end surface and the outer peripheral surface of the fiber guide 11 as the bottom when viewed from above.

  Due to the protrusion 11 b, the opening width of the groove 11 a at both ends of the fiber guide 11 is slightly smaller than the diameter of the optical fiber 15. However, when the optical fiber 15 is disposed in the groove 11a, the protective material itself of the optical fiber 15 is temporarily elastically deformed by strongly pressing the optical fiber 15 against the protrusion 11b, and the opening width of the groove 11a is increased. Since it temporarily spreads, the optical fiber 15 can be easily disposed in the groove 11a even if there is the protrusion 11b.

  As shown in FIG. 1, a pedestal portion 11 d is provided on the lower side of the fiber guide 11 at a symmetrical position with respect to the longitudinal center (arc midpoint) B of the fiber guide 11. A hook 12 is disposed below 11d. As shown in FIG. 5, these hooks 12 have a support shaft portion 12a and a hinge portion (elastic portion) 12b. The support shaft portion 12a is formed in a rod shape, and extends substantially vertically downward with respect to a circle whose center is the point A and whose fiber guide 11 (center axis of the fiber guide 11) is a part of the circumference. Since the support shaft portion 12a is thick and has low elasticity, it hardly deforms even when stress is applied.

  On the other hand, the hinge portion 12b extends obliquely upward from the lower end of the support shaft portion 12a, and is thin and highly elastic. Therefore, when stress is applied, the hinge portion 12b is separated from the support shaft portion 12a (indicated by an arrow in FIG. 5). It is elastically deformed in the direction shown). Note that the upper end of the hinge portion 12b is located slightly below the upper end (base end) of the support shaft portion 12a.

  In the present embodiment, as shown in FIG. 1, the optical fiber fixture 10 is moved from infinity on a straight line connecting the center of curvature A of the fiber guide 11 and the center (midpoint of the arc) B of the fiber guide 11 in the longitudinal direction. It is important that a gap is visible between the hinge portion 12b and the fiber guide 11 when viewed. It is also important that a gap is visible at the end of the fiber guide 11 between the projection 11b and the bottom (inner wall) of the groove 11a.

  The optical fiber fixture 10 of the present embodiment is formed by resin injection molding. A mold used for injection molding is configured by combining a plurality of mold blocks (such as a mold plate and insert). Generally, as the number of mold blocks increases, the cost of the mold increases, and as a result, the product cost also increases. The optical fiber fixture 10 of the present embodiment is devised to reduce the number of mold blocks constituting the mold. Hereinafter, the device will be described.

  When the product is taken out after injection molding, the mold is divided into mold blocks. At this time, the removal direction (movement direction) of the mold block depends on the shape of the product, and when the shape is complicated, the removal direction of the mold block increases. Since at least one mold block is required for one removal direction, the number of mold blocks increases as the removal direction of the mold block increases, and the product cost increases. For example, if the mold block can be removed in two directions (two directions opposite to each other), the mold can be composed of at least two mold blocks, thereby reducing the cost of the mold. Can do.

  FIG. 6 shows the direction of removing the mold block in the portion where the groove 11a of the fiber guide 11 is formed, the direction of removing the mold block in the portion where the protrusion 11b is formed, and the portion where the hinge portion 12b of the hook 12 is formed. It is a figure which shows the extraction direction of a metal mold block. In FIG. 6, the code | symbol 101 has shown the metal mold block (a part of metal mold block).

  As can be seen from FIG. 6, in this embodiment, the removal direction of the mold block of the portion forming the groove 11 a, the protrusion 11 b of the fiber guide 11 and the hinge 12 b of the hook 12 is all the same direction (or mutual). In the opposite direction). If the gap between the support shaft portion 12a of the hook 12 and the hinge portion 12b is not visible from an infinite distance on the straight line connecting the point A and the point B shown in FIG. 1, the support shaft portion 12a and the hinge portion The direction in which the mold block that forms the gap with 12b is pulled out is different from the direction shown in FIG. As a result, the number of mold blocks increases and the product cost increases. Similarly, when no gap is visible between the protrusion 11b and the bottom (inner wall) of the groove 11a at the end of the fiber guide 11, the mold block removal direction is different from the direction shown in FIG. The number of mold blocks increases and causes an increase in product cost.

  That is, in the optical fiber fixture 10 according to the present embodiment, since the fiber guide 11, the hook 12, the protrusion 11b, and the like have the shapes shown in FIGS. 1 to 4, the number of mold blocks required for injection molding can be reduced. It can be manufactured at low cost.

  Hereinafter, an example of laying an optical fiber using the optical fiber fixture 10 of the present embodiment will be described.

  Normally, a server rack installed in a data center complies with the EIA (Electronic Industry Association) standard. A general server rack is called a 19-inch rack, and the horizontal interval between the screws for mounting the equipment is 19 inches (482.6 mm). On the other hand, the height direction of equipment stored (mounted) in the rack is defined in units of U (unit), and 1U is 1.75 inches (44.45 mm). Therefore, a typical 1U server used in a data center is set to have a width of about 19 inches and a height of about 1.75 inches.

  FIG. 7 is a diagram illustrating an example of a server rack. FIG. 7 is a schematic view of the server rack as viewed from the side. Here, for convenience of explanation, the exhaust side of the server rack is the front surface and the intake side is the back surface.

  The server rack 21 is a 19-inch rack and has, for example, a height of 2 m, a width of 0.6 m, and a depth of 0.95 m. In the rack 21, one or a plurality of servers 25 are arranged side by side in the height direction. Opening and closing doors 22a and 22b are provided on the front side and the back side of the rack 21 so that the server 25 can be easily attached and detached and maintained. These open / close doors 22a and 22b are provided with lattice openings so that air can flow therethrough.

  Cold air (low temperature air) is supplied into the data center (computer room) by the air conditioner. The cold air supplied into the room is introduced into the rack 21 and the server 25 through the opening of the opening / closing door 22b on the back surface side (intake side) by the rotation of the fan 26 in the server 25. Then, the CPU or the like in the server 25 is cooled to become hot air, and is discharged out of the rack 21 through the opening of the front side (exhaust side) open / close door 22a. Here, it is assumed that punching metal is provided on the open / close doors 22a and 22b, and intake and exhaust are performed through openings of the punching metal. Further, here, in order to measure the temporal change in the amount of heat generated in the rack 21 and the temporal change in the temperature distribution in the rack 21, the optical fiber fixture 10 is attached to predetermined locations of the punching metal on the intake side and the exhaust side. These optical fiber fixtures 10 are used to lay optical fibers.

  8 and 9 are views showing a state in which the optical fiber fixture 10 is attached to the punching metal of the open / close doors 22a and 22b.

  FIG. 8 shows a case where the opening of the punching metal is rectangular. As shown in FIG. 8, the hook 12 of the optical fiber fixture 10 is inserted into the opening of the punching metal 27, and the punching metal 27 is sandwiched between the tip of the hinge portion 12 b and the fiber guide 11. The fiber fixing tool 10 is fixed. If the hinge portion 12b hits the punching metal 27 when the hook 12 is inserted into the opening of the punching metal 27, the hinge portion 12b is elastically deformed and constricted. When the hinge portion 12b passes through the opening, it returns to its original shape due to the elastic force, and the punching metal 27 is sandwiched between the tip of the hinge portion 12b and the fiber guide 11 as described above.

  FIG. 9 shows a case where the opening of the punching metal is circular. Also in this case, the hook 12 of the optical fiber fixture 10 is inserted into the opening of the punching metal 28, and the punching metal 28 is sandwiched between the tip of the hinge portion 12b and the fiber guide 11, so that the optical fiber fixture 10 is fixed. To fix.

  In the example shown in FIGS. 8 and 9, since air flows in the vertical direction with respect to the punching metals 27 and 28, the opening / closing direction of the hook 12 (moving direction of the hinge portion 12b) is perpendicular to the air flowing direction. Direction. Moreover, in the optical fiber fixture 10 of this embodiment, since the optical fiber fixture 10 is fixed to the punching metals 27 and 28 by the two hooks 12, the optical fiber fixture 10 does not rotate or move. The optical fiber can be arranged at a desired position. Further, the optical fiber fixture 10 of the present embodiment has a shape in which a generally thin rod is curved along the circumference and does not hinder the air flow, so the air on the intake side and the exhaust side of the rack. Temperature can be measured with high accuracy.

  By the way, if the optical fiber is bent with a diameter smaller than the minimum bending radius, the optical fiber is broken or the characteristics are remarkably deteriorated. Therefore, it is preferable that the radius of curvature of the optical fiber fixture 10 (fiber guide 11) is larger than the minimum bending radius of the optical fiber. The minimum bending radius of the optical fiber is specified by the manufacturer. The minimum bending radius of a general optical fiber is about 15 mm.

  On the other hand, when measuring the temperature of the air discharged from the server 25, if the optical fiber overlaps the adjacent server, the temperature of the air discharged from the server of interest is affected by the heat of the adjacent server. Cannot be measured accurately. For this reason, it is preferable that the radius of curvature of the optical fiber fixture 10 (the radius of curvature of the fiber support surface) is about ½ of 1U (44.45 mm) or smaller. In this embodiment, as described above, the radius of curvature at the fiber support surface is 22.5 mm.

  FIGS. 10A to 10C are diagrams showing examples of actual optical fiber installation. In FIG. 10A, two optical fiber fixtures 10 are arranged close to each other so as to face each other, and the optical fiber 20 is placed between them in a circular shape (coiled shape) by utilizing the elastic tension of the optical fiber 20. ). FIG. 10B is an example in which two optical fiber fixtures 10 are arranged facing each other at a distance, and the optical fiber 20 is laid in the shape of an 8 between them. FIG. 10C shows an example in which the laying direction of the optical fiber 20 is bent by 90 ° using the optical fiber fixture 10.

  As shown in FIGS. 10A to 10C, the optical fiber fixture 10 of the present embodiment can correspond to various laying forms of optical fibers.

  Furthermore, since the optical fiber fixture 10 of the present embodiment is sandwiched between the hinge portion 12b and the fiber guide 11 and fixed to the punching metals 27 and 28, the punching metals 27 and 28 are easily attached and detached. Can be easily accommodated.

  In the above example, the case where the fiber guide is curved along a perfect circular arc has been described. However, the fiber guide is curved along a flat circular (elliptical) arc having different major and minor axis lengths. You may do it.

(Second Embodiment)
FIG. 11 is a diagram illustrating an optical fiber fixture according to the second embodiment. FIGS. 12A and 12B are schematic views showing the change in the shape of the hook when the optical fiber fixture is similarly attached to the punching metal.

  The optical fiber fixture 30 of this embodiment includes a fiber guide 31 and a hook 32. The fiber guide 31 has a shape curved in an arc shape like the fiber guide 11 of the first embodiment, and a groove for arranging the optical fiber is formed on the outer peripheral surface. Further, both end portions of the fiber guide 31 are respectively provided with triangular projections (drop-off prevention portions) 31b. Further, a pedestal portion 31 d is provided on the lower center side of the fiber guide 31. The hook 32 is formed below the pedestal 31d.

  The hook 32 has a rod-shaped support shaft portion 32a extending vertically downward from the base portion 31d and a hinge portion 32b extending substantially horizontally from the lower end of the support shaft portion 32a. The hinge portion 32b is located slightly above the distal end side than the proximal end side (support shaft portion 32a side). That is, as shown in FIG. 12A, the distance between the hinge portion 32b and the base portion 31d on the base end side (support shaft portion 32a side) of the hinge portion 32b is set slightly larger than the thickness of the punching metal 35, The distance between the hinge portion 32b and the pedestal portion 31d on the distal end side is set slightly smaller than the thickness of the punching metal 35.

  Also in the present embodiment, as in the first embodiment, the optical fiber is fixed from an infinite distance on a straight line connecting the center of curvature A of the fiber guide 31 and the center (the midpoint of the arc) B of the fiber guide 31 in the longitudinal direction. When the tool 30 is viewed, a gap is visible between the fiber guide 31 (pedestal portion 31d) and the hinge portion 32b. Therefore, the number of mold blocks used for injection molding can be reduced, and it can be manufactured at low cost.

  When the optical fiber fixing portion 30 is attached to the punching metal 35, the support shaft portion 32a and the hinge portion 32b of the hook 32 are inserted into the opening portion of the punching metal 35 as shown in FIG. Then, the optical fiber fixture 30 is shifted in the horizontal direction (direction parallel to the surface of the punching metal).

  Then, as shown in FIG. 12 (b), the hinge portion 32b hits the punching metal 35 and is elastically deformed, and the gap between the pedestal portion 31d and the hinge portion 32b is expanded, so that the space between the pedestal portion 31d and the hinge portion 32b is increased. Punching metal 35 is sandwiched between the two. In this way, the optical fiber fixture 30 is attached to the punching metal 35 by the elastic force of the hinge portion 32b. In the optical fiber fixture 30 of the present embodiment, the opening / closing direction of the hinge portion 32 b is parallel to the air flow direction through the punching metal 35.

  Similarly to the first embodiment, the optical fiber fixture 30 of the present embodiment can be manufactured at a low cost and can correspond to various laying forms of the optical fiber. In addition, it is difficult to obstruct the air flow through the punching metal 35, and it is possible to easily cope with a change in equipment.

  In addition, although only one hook 32 is provided in the optical fiber fixture 30 of the present embodiment, a plurality of hooks 32 may be provided so that the optical fiber fixture 30 can be securely fixed by punching metal or the like. Further, as shown in FIG. 13, a rotation preventing part (engagement assisting member) 33 that engages with the opening of the punching metal and prevents the rotation of the optical fiber fixture 30 may be provided separately from the hook 32. .

  Furthermore, in this embodiment, the hinge portion 32b is slightly inclined so that the distance between the hinge portion 32b and the pedestal portion 31d on the distal end side is narrower than the distance between the hinge portion 32b and the pedestal portion 31d on the proximal end side of the hinge portion 32b. Is formed. However, as shown in FIG. 14A, the hinge portion 32b may be formed horizontally. Also in this case, as shown in FIG. 14B, the optical fiber fixture 30 can be fixed by sandwiching the punching metal 35 between the hinge portion 32b and the base portion 31d. In this case, even if the extending direction of the hinge portion 32b is the direction of a straight line connecting the point A and the point B shown in FIG.

(Third embodiment)
FIG. 15 is a perspective view showing an optical fiber fixture according to the third embodiment.

  The optical fiber fixture 40 according to the present embodiment includes a fiber guide 41 and a hook 42. The fiber guide 41 includes a base portion 41a that is curved in an arc shape, a pair of inner wall portions 41b that are disposed along the inner side (curvature center side) of the base portion 41a to form a fiber support surface, and the base portion 41a. And an outer wall portion 41c disposed along the outer side. The optical fiber is disposed on a fiber laying path between a curved surface formed by extending the surface of the inner wall portion 41b and a curved surface formed by extending the surface of the outer wall portion 41c.

  The pair of inner wall portions 41b is disposed on the end side of the arc-shaped base portion 41a, and the outer wall portion 41c is disposed in the center portion of the base portion 41a. The upper portions of both the inner wall portion 41b and the outer wall portion 41c protrude slightly toward the fiber laying path side, so that the optical fiber is less likely to drop off.

  In order to reduce the number of mold blocks used for injection molding, when viewed from infinity on a straight line connecting the center of curvature A of the fiber guide 41 and the midpoint B in the longitudinal direction of the base portion 41, the inner wall It is important that a gap is visible between the portion 41a and the outer wall portion 41b.

  The hook 42 is connected to the lower surface side of the base portion 41a. Since the hook 42 is basically the same as the hook 12 of the first embodiment, the description thereof is omitted here. Also in the optical fiber fixture 40 of the present embodiment, the same effect as in the first embodiment can be obtained.

(Fourth embodiment)
FIG. 16 is a top view showing an optical fiber fixture according to the fourth embodiment. The difference between this embodiment and the first embodiment is that the shape of the fiber guide is different, and the other structure is basically the same as that of the first embodiment, and therefore, the description of the overlapping parts is omitted.

  The optical fiber fixture 50 according to the present embodiment includes a fiber guide 51 and a hook (not shown) provided on the lower side of the fiber guide 51.

  The fiber guide 51 of the optical fiber fixture 50 of the present embodiment is arranged along a plate-like base portion 51a that is curved in an arc shape, and a side on the inner side (curvature center side) of the base portion 51a, and a fiber support surface is provided. An inner wall portion 51b to be formed, an outer wall portion 51c arranged along the outer side of the base portion 51a, and a detachment preventing portion (falling prevention portion) 51d arranged at both ends of the outer side of the base portion 51a. Have.

  The inner wall portion 51b is disposed at both ends and the center portion of the arc-shaped base portion 51a, and the outer wall portion 51c looks at the optical fiber fixture 50 from an infinite distance on the line connecting the center of curvature A and the center point B of the fiber guide 50. At a position visible between the outer wall portions 51a. Further, the disengagement preventing portion 51d has a gap between the outer wall portion 51c and the outer wall portion 51b when the optical fiber fixture 50 is viewed from infinity on the line connecting the center of curvature A and the center point B of the fiber guide. It is formed so that it can be seen.

  17A is a view showing an end face of the optical fiber fixture 50 (fiber guide 51), and FIG. 17B is a cross-sectional view taken along the line II of FIG.

  As shown in FIGS. 17A and 17B, the fiber laying path side surface (fiber support surface) of the inner wall 51b is recessed, and one or more optical fibers 15 are laid along the recessed surface. Is done. Further, as shown in FIG. 17A, the distance between the upper end of the inner wall portion 51b and the upper portion of the detachment preventing portion 51d is slightly smaller than the diameter of the optical fiber 15, and is disposed on the fiber laying path. The optical fiber 15 is difficult to come off. Also in this embodiment, the same effect as that of the first embodiment can be obtained.

  By the way, in the optical fiber fixture 50 of this embodiment, when arrange | positioning a some optical fiber, an optical fiber is located in a line with the height direction of the inner wall part 51b. When the number of optical fibers is large, it is necessary to increase the height of the inner wall portion 51b. However, in this case as well, the area of the optical fiber fixture 50 with respect to the air flow direction does not change. In other words, in the optical fiber fixture 50 of the present embodiment, the width of the fiber guide 51 (projected area with respect to the punching metal) is constant regardless of the number of optical fibers arranged on the fiber support surface, and obstructs air flow. There are few things. Therefore, the temperature of the air passing through the opening of the punching metal can be accurately measured. For example, in the case of the first embodiment (see FIG. 1), since a plurality of optical fibers are arranged in the depth direction of the groove 11a, the width of the fiber guide 11 increases as the number of optical fibers arranged in the groove 11a increases. Thus, the air flow through the punching metal is obstructed. As a result, it is conceivable that the measurement accuracy of the temperature of the air passing through the opening of the punching metal is lowered.

  In the present embodiment, a recess is provided on the fiber laying path side of the inner wall portion 51b, which makes it difficult for the optical fiber 15 to be detached from the optical fiber fixture 10, so the outer wall portion 51c may be omitted. .

  FIG. 18 is a top view showing a modification of the optical fiber fixture of the present embodiment. 18, the same components as those in FIG. 16 are denoted by the same reference numerals.

  In the optical fiber fixture 55 shown in FIG. 18, the inner wall part 56b is continuously formed along the inner side (curvature center side) side of the base part 51a. The surface (fiber support surface) of the inner wall portion 56b on the fiber laying path side is recessed (see FIG. 17B), and one or a plurality of optical fibers are laid along the recessed surface. Further, the both ends of the base portion 51a are provided with a detachment preventing portion 51d similar to the optical fiber fixture 50 of FIG.

  In this optical fiber fixture 55, the same effect as that of the optical fiber fixture 50 shown in FIG. 16 can be obtained.

(Fifth embodiment)
FIG. 19 is a perspective view showing an optical fiber fixture according to the fifth embodiment.

  The difference between this embodiment and the first embodiment is that the structure of the fiber guide is different, and other structures are basically the same as those of the first embodiment.

  The optical fiber fixing unit 60 according to the present embodiment includes a fiber guide 61 and a hook 62 provided on the lower side of the fiber guide 61.

  The fiber guide 61 includes a base portion 61a that is curved in an arc shape, and a plurality of guide posts 61b and 61c that are disposed along the inner and outer sides of the base portion 61a. The guide posts 61b are arranged at a constant pitch along the inner side (curvature center side) of the base part 61a, and the guide posts 61c are arranged along the outer side of the base part 61a. However, when viewed from an infinite distance on a straight line connecting the center of curvature of the base portion 61a and the midpoint in the longitudinal direction of the base 61a, the guide post 61c is positioned approximately in the middle between the guide posts 61b.

  A fiber laying path for laying optical fibers is formed between an arcuate curved surface (fiber support surface) connecting each guide post 61b and an arcuate curved surface connecting each guide post 61c. The upper portions of the guide posts 61b and 61c both protrude toward the fiber laying path side, which makes it difficult for the optical fiber laid on the fiber laying path to come off.

  FIGS. 20A to 20C are schematic views showing a state in which the optical fiber is supported by the guide posts 61b and 61c. 20A shows a cross section at the position of the guide post 61b, FIG. 20B shows a cross section at the position of the guide post 61c, and FIG. 20C shows the guide posts 61b and 61c from the end of the fiber guide 61. Shows the state of seeing.

  As shown in FIGS. 20A to 20C, the plurality of optical fibers 15 arranged in the fiber laying path are arranged in the height direction of the guide posts 61b and 61c.

  Since the structure of the hook 62 is the same as that of the hook 12 of the first embodiment, the description thereof is omitted here. Also in the optical fiber fixture 60 of the present embodiment, the same effect as in the first embodiment can be obtained.

(Sixth embodiment)
FIGS. 21A and 21B are perspective views showing an optical fiber fixture according to the sixth embodiment. FIG. 22 is a perspective view showing a state in which an optical fiber is disposed in the optical fiber fixture.

  An optical fiber fixture 70 according to the present embodiment includes a fiber guide 71 formed in a ring shape (hollow ring), a clamp portion (drop-off prevention portion) 72 that holds the optical fiber 15 on the peripheral surface of the fiber guide 71, and And a hook 73 for fixing the optical fiber fixture 70 to a support member such as a punching metal. Similarly to the optical fiber fixture 10 of the first embodiment, the optical fiber fixture 70 is also integrally formed by resin injection molding.

  The fiber guide 71 has a ring-shaped base portion 71a and an inner wall portion 71b formed along the side on the inner side (ring center side) of the base portion 71a. The outer peripheral surface (fiber support surface) of the inner wall 71b is slightly recessed toward the ring center side, and the optical fiber 15 is disposed along the outer peripheral surface of the inner wall 71b as shown in FIG. Here, the radius on the outer peripheral surface (fiber support surface) of the inner wall 71b is 22.5 mm.

  As shown in FIG. 21, the clamp portion 72 is disposed at two positions where a straight line (first straight line) passing through the center point (ring center) of the fiber guide 71 intersects the fiber guide 71. These clamp parts 72 have a spring part 72a whose lower end is connected to the base part 71a and has elasticity, and a handle part 72b connected to the upper end of the spring part 72a. As shown in FIG. 22, in a normal state, there is almost no gap between the tip of the handle portion 72b and the upper end of the inner wall portion 71b. However, when the handle portion 72b is pushed down with a finger, the spring portion 72a is deformed and a gap through which the optical fiber 15 passes is formed between the tip of the handle portion 72b and the upper end of the inner wall portion 71b. When the finger is released from the handle portion 72b, it returns to the original state by the elastic force of the spring portion 72a and the gap between the handle portion 72b and the upper end of the inner wall portion 71b is closed.

  As shown in FIG. 21, the hook 73 is disposed at a position where a straight line (second straight line) orthogonal to a straight line connecting the two clamp portions 72 (first straight line) intersects the fiber guide 71. These hooks 73 have substantially the same structure as the hooks of the second embodiment (see FIG. 2 or FIG. 4). That is, as shown in FIG. 21B, the hook 73 includes a support shaft portion 73a extending substantially vertically downward from the base portion 71d of the fiber guide 71, and a hinge portion 73b extending horizontally from the lower end of the support shaft portion 73a. Have. As in the second embodiment, a support member such as a punching metal is sandwiched and fixed between the hinge portion 73b and the base portion 71d (fiber guide 71).

  In order to reduce the number of mold blocks at the time of injection molding, as shown in FIG. 23, when the optical fiber fixture 70 is viewed from an infinite distance on a straight line (second straight line) connecting the two hooks 73. It is important that a gap is visible between the fiber guide 71 and the clamp portion 72 (the tip of the handle portion 72b) and that a gap is also visible between the base portion 71d (fiber guide 71) and the hinge portion 73b.

  FIG. 24 is a schematic diagram showing a state in which the optical fiber fixture 70 of the present embodiment is attached to a punching metal 75 whose opening has a hexagonal shape. FIG. 25 is a schematic view showing a state in which the optical fiber fixture 70 of the present embodiment is attached to a punching metal 76 having a circular opening.

  Since the optical fiber fixture 70 of this embodiment is ring-shaped, the number of mold blocks used during injection molding is increased and the manufacturing cost is slightly higher than that of the optical fiber fixture 10 of the first embodiment. . However, as shown in FIG. 22, the optical fiber fixture 70 of the present embodiment can be easily and accurately wound in a circle when the optical fiber 15 is wound in a circle.

  In the optical fiber fixture 70 of the present embodiment, not only when the optical fiber is laid in a circular shape, but also with various light such as when the optical fiber is laid in the shape of an 8 or when the laying direction is bent by 90 °. This can correspond to a fiber laying configuration.

(Seventh embodiment)
FIGS. 26A and 26B are perspective views showing an optical fiber fixture according to the seventh embodiment.

  The optical fiber fixture 80 of the present embodiment includes a fiber guide 81 formed in an arc shape, a clamp portion 82 that holds the optical fiber on the outer peripheral surface of the fiber guide 81, and the optical fiber fixture 80 such as punching metal. And a hook 83 to be fixed to the support member. The optical fiber fixture 80 is also integrally formed by resin injection molding, as with the optical fiber fixture 10 of the first embodiment.

  The fiber guide 81 has an arc-shaped base part 81a and an inner wall part 81b formed along the side on the inner side (curvature center side) of the base part 81a. The outer peripheral surface (fiber support surface) of the inner wall portion 81b is slightly recessed toward the center of curvature, and the optical fiber 15 is disposed along the outer peripheral surface of the inner wall portion. Here, the curvature radius on the outer peripheral surface (fiber support surface) of the inner wall portion 81b is 22.5 mm. Further, an angle θ formed by two straight lines connecting the center of curvature and both ends of the fiber guide 81 is set to be larger than 90 ° and smaller than 180 ° (90 ° <θ <180 °). Here, it is assumed that the angle θ is set to 140 °.

  The clamp part 82 is disposed at both ends of the fiber guide 81. Since the structure of these clamp parts 82 is the same as that of the clamp part 72 of 6th Embodiment, the description is abbreviate | omitted here.

  The hooks 83 are disposed at both ends of the fiber guide 81 and below the central portion, respectively. These hooks 83 have a support shaft portion 83a that extends substantially vertically downward from the base portion 81a of the fiber guide 81, and a hinge portion 83b that extends in the horizontal direction from the lower end of the support shaft portion 83a. Similar to the hook 32 of the optical fiber 30 of the second embodiment, a support member such as punching metal is sandwiched between the hinge portion 83b and the base portion 81d (fiber guide 81) to support the optical fiber fixture 80. Secure to the member.

  In order to reduce the number of mold blocks at the time of injection molding, the optical fiber fixture 80 was viewed from an infinite distance of a straight line connecting the center of curvature of the fiber guide 81 and the midpoint of the fiber guide 81 (midpoint of the arc). Sometimes it is important to see a gap between the fiber guide 81 and the clamp part 82 (tip of the handle part) and a gap between the fiber guide 81 and the hinge part 83b.

  Also in the optical fiber fixture 80 of the present embodiment, the same effect as in the first embodiment can be obtained.

  10, 30, 40, 50, 55, 60, 70, 80 ... optical fiber fixtures, 11, 31, 41, 51, 61, 71 ... fiber guides, 11a ... grooves, 11b ... projections (drop-off prevention parts), 11d, 31d, 71d, 81d ... pedestal part, 12, 32, 42, 62, 73, 83 ... hook, 12a, 73a, 83a ... support shaft part, 12b, 32b, 73b, 83b ... hinge part, 15, 20 ... Optical fiber, 21 ... Server rack, 22a, 22b ... Open / close door, 25 ... Server, 26 ... Fan, 27, 28, 35, 75, 76 ... Punching metal, 33 ... Anti-rotation part (engagement assisting member), 41a, 51a, 61a. 71a, 81a ... Base part, 41b, 51b, 56b, 71b, 81b ... Inner wall part, 41c, 51c ... Outer wall part, 51d ... Fall-off prevention part (fall-off prevention part), 61b, 61c ... Guide post, 72, 82 ... Clamp Part, 72a ... spring part, 73b ... handle part, 101 ... mold block.

Claims (4)

A fiber guide that is a ring-shaped member and supports the optical fiber in a state of being curved in a circular arc or a coil along the peripheral surface;
An engaging portion that protrudes from the fiber guide in a direction parallel to the central axis of the fiber guide and is detachable from the support member;
A drop prevention portion for preventing the optical fiber from dropping;
The fiber guide, the engagement portion and the drop-off prevention portion are integrally formed of resin,
The engaging portions are respectively arranged at two positions where a first straight line passing through a ring center of the fiber guide intersects the fiber guide;
The drop-off prevention portions are respectively disposed at two positions where a second straight line passing through the ring center and intersecting the first straight line intersects the fiber guide.
The engaging part and the drop-off preventing part are provided with gaps that allow all the mold blocks used in molding to be pulled out in the same direction or in opposite directions, and are infinitely distant on a straight line connecting the two engaging parts. When viewed from above, the gap between the engaging portion and the drop-off preventing portion of the optical fiber fixture can be seen. Optical fiber fixture. A method of manufacturing an optical fiber fixture, wherein a mold is formed by combining a plurality of mold blocks, and a resin is injected into the mold to manufacture an optical fiber fixture,
The optical fiber fixture is:
A fiber guide that is a ring-shaped member and supports the optical fiber in a state of being curved in a circular arc or a coil along the peripheral surface;
An engaging portion that protrudes from the fiber guide in a direction parallel to the central axis of the fiber guide and is detachable from the support member;
A drop prevention portion for preventing the optical fiber from dropping;
The fiber guide, the engagement portion and the drop-off prevention portion are integrally formed of resin,
The engaging portions are respectively arranged at two positions where a first straight line passing through a ring center of the fiber guide intersects the fiber guide;
The drop-off prevention portions are respectively disposed at two positions where a second straight line passing through the ring center and intersecting the first straight line intersects the fiber guide.
The engaging part and the drop-off preventing part are provided with gaps that allow all the mold blocks used in molding to be pulled out in the same direction or in opposite directions, and are infinitely distant on a straight line connecting the two engaging parts. A method of manufacturing an optical fiber fixture, wherein a gap between the engagement portion and the drop-off prevention portion is visible when viewed from above . An optical fiber fixture attached to a support member of the server rack;
An optical fiber supported by the optical fiber fixture and functioning as a temperature sensor;
The optical fiber fixture is:
A fiber guide that is a ring-shaped member and supports the optical fiber in a state of being curved in a circular arc or a coil along the peripheral surface;
An engaging portion that protrudes from the fiber guide in a direction parallel to the central axis of the fiber guide and is detachable from the support member;
A drop prevention portion for preventing the optical fiber from dropping;
The fiber guide, the engagement portion and the drop-off prevention portion are integrally formed of resin,
The engaging portions are respectively arranged at two positions where a first straight line passing through a ring center of the fiber guide intersects the fiber guide;
The drop-off prevention portions are respectively disposed at two positions where a second straight line passing through the ring center and intersecting the first straight line intersects the fiber guide.
The engaging part and the drop-off preventing part are provided with gaps that allow all the mold blocks used in molding to be pulled out in the same direction or in opposite directions, and are infinitely distant on a straight line connecting the two engaging parts. The temperature measurement system, wherein the gap between the engagement portion and the drop-off prevention portion of the optical fiber fixture can be seen when viewed from above . Multiple server racks,
An optical fiber fixture attached to a support member of the plurality of server racks;
An optical fiber supported by the optical fiber fixture and functioning as a temperature sensor;
The optical fiber fixture is:
A fiber guide that is a ring-shaped member and supports the optical fiber in a state of being curved in a circular arc or a coil along the peripheral surface;
An engaging portion that protrudes from the fiber guide in a direction parallel to the central axis of the fiber guide and is detachable from the support member;
A drop prevention portion for preventing the optical fiber from dropping;
The fiber guide, the engagement portion and the drop-off prevention portion are integrally formed of resin,
The engaging portions are respectively arranged at two positions where a first straight line passing through a ring center of the fiber guide intersects the fiber guide;
The drop-off prevention portions are respectively disposed at two positions where a second straight line passing through the ring center and intersecting the first straight line intersects the fiber guide.
The engaging part and the drop-off preventing part are provided with gaps that allow all the mold blocks used in molding to be pulled out in the same direction or in opposite directions, and are infinitely distant on a straight line connecting the two engaging parts. A data center, wherein a gap between the engagement portion and the drop-off prevention portion can be seen when viewed from above .

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