JP5150139B2 - Fiber head mounting structure and mounting tool used therefor - Google Patents

Description

  The present invention relates to a fiber head mounting structure that is mounted on a mounting plate provided at a predetermined position on a light projecting side and a light receiving side and a mounting tool used therefor, for example, in order to monitor articles in a factory production line or the like. is there.

Conventionally, as this type of fiber head mounting structure, for example, a configuration as disclosed in Patent Document 1 has been proposed. In this conventional configuration, an optical fiber, a cylindrical holder fixed to the tip of the optical fiber, and a cylindrical fixture fitted to be tiltable on the enormous sphere portion on the outer periphery of the holder, A fiber head is configured. A screw portion is formed on the outer periphery of the fixture over almost the entire length in the axial direction. Then, with the fiber head fixture inserted through the mounting hole of the mounting plate, a pair of nuts are screwed onto the screw portion on the fixture from the detection region side and the detection region side of the mounting plate. The fiber head is attached to the attachment plate and is arranged so as to correspond to the detection region.
Japanese Utility Model Publication No. 6-4708

  However, in this conventional fiber head mounting structure, the fixing tool is formed in a cylindrical shape, and the insertion position of the fixing tool with respect to the mounting hole of the mounting plate is not restricted. For this reason, when the fiber head fixing tool is inserted and fixed in the mounting hole of the mounting plate, there is a problem that the insertion position of the fixing tool relative to the mounting hole of the mounting plate changes due to the tightening of the pair of nuts. It was.

  That is, when the tightening amount of the nut located on the detection area side of the mounting plate is increased, the tip portion of the fiber head may greatly protrude from the side surface of the mounting plate to the detection area side and may interfere with the object to be detected. On the other hand, when the tightening amount of the nut located on the opposite side of the detection area of the mounting plate increases, the tip of the fiber head enters from the side surface of the mounting plate, and the tightening strength of the fixture by the nut on the detection area side increases. There was a risk of shortage.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a fiber head mounting structure and a mounting tool used therefor, in which the fiber head can always be regulated and mounted at a fixed position with respect to the mounting hole of the mounting plate.

  In order to solve the above-described problems, the invention according to claim 1 attaches a fiber head having a sleeve fitted to the outer periphery of the tip of an optical fiber in a state of being inserted into a mounting hole of a mounting plate provided at a predetermined position. It is an attachment structure, and the sleeve has a main tube portion formed with a screw portion on the outer periphery, and protrudes from the front end side of the main tube portion, and more than the main tube portion formed with a screw portion on the outer periphery. A small-diameter tip tube portion is provided, and the tip tube portion of the sleeve is inserted into the attachment hole of the attachment plate, and is screwed onto the screw portion on the tip tube portion from the detection region side of the attachment plate. A fitting having a screw hole, and a stepped portion between the main tube portion and the tip tube portion, and a screw amount setting portion for setting a screw amount of the screw portion on the tip tube portion with respect to the screw hole of the fitting to a predetermined amount. And a screw portion on the main tube portion of the sleeve from the side opposite to the detection region of the mounting plate A nut to be screwed together, and the fixture and the nut in a state in which the fitting is screwed to a threaded portion of the tip cylindrical portion of the sleeve and the nut is screwed to a threaded portion on the main cylindrical portion. The gist is that the mounting plate is sandwiched between the two.

The invention according to claim 2 is an attachment structure for attaching a fiber head having a sleeve fitted to the outer periphery of the tip end of an optical fiber in a state of being inserted into an attachment hole of an attachment plate provided at a predetermined position. the outer periphery forms a threaded portion, in a state where the leading end of the sleeve was inserted into the mounting hole of the mounting plate, the screw hole to be screwed from the detection region side of the mounting plate to the threaded portion on the distal end of the sleeve A fixture having a threaded amount of a screw portion at the tip of the sleeve with respect to the screw hole of the fixture formed by positioning the tip surface of the sleeve and corresponding to the tip of the screw hole of the fixture. And a nut to be screwed to the screw portion of the sleeve from the opposite side to the detection region of the mounting plate, and a screw portion at the tip of the sleeve is inserted into the screw hole of the fixture. Threaded and of the sleeve In a state in which the nut is screwed to the di-section, and summarized in that the mounting plate between the fitting and the nut has to be clamped.

The gist of the invention described in claim 3 is that, in the fiber head mounting structure according to claim 1 or 2, a spacer is interposed between the side surface opposite to the detection region of the mounting plate and the nut. To do.

According to a fourth aspect of the present invention, there is provided the fiber head mounting structure according to any one of the first to third aspects, wherein the mounting hole of the mounting plate has a tapered hole portion that gradually increases in diameter toward the detection region side. And a tapered surface that can be engaged with the tapered hole portion of the mounting hole is formed on the outer peripheral surface of the mounting tool.

According to a fifth aspect of the present invention, in the fiber head mounting structure according to any one of the first to fourth aspects, the mounting plate is formed on the side surface on the detection region side at the outer peripheral portion of the tip of the mounting tool. The gist of the present invention is that a recess is formed to accommodate the bowl-shaped pedestal portion.

The invention according to claim 6 is the fiber head mounting structure according to any one of claims 1 to 5 , wherein an engagement groove capable of engaging with a tool is formed on a tip surface of the mounting tool. The gist of the invention is that an interference preventing portion for preventing the tool engaged in the engaging groove from interfering with the tip of the optical fiber is provided on the inner periphery of the tip of the screw hole of the fixture.

The invention according to claim 7 is the fiber head mounting structure according to claim 6 , wherein the interference preventing portion is an interference preventing flange formed on an inner periphery of a tip end portion of the screw hole of the fixture. The gist is that a tapered surface having a larger diameter on the outer peripheral surface is formed on the inner peripheral surface of the flange.

The invention described in claim 8, a fitting used in the attachment structure of the fiber head according to any one of claims 1 to claim 7, the rotary tool to the front end surface of the fitting The gist is that an engagement groove for engagement is provided.

According to a ninth aspect of the present invention, in the fixture used in the fiber head mounting structure according to the eighth aspect of the invention, a rectangular engagement portion is provided on the outer peripheral surface of the fixture for engaging the rotary tool. This is the gist.

(Function)
According to the first aspect of the present invention, when the fiber head is inserted and assembled into the mounting hole of the mounting plate, the tip cylindrical portion of the sleeve is in a state in which the nut is screwed into the screw portion on the main cylindrical portion of the sleeve in advance. Is inserted into the mounting hole from the side opposite to the detection region of the mounting plate, and then the mounting tool is screwed from the detection region side of the mounting plate to the screw portion on the distal end cylindrical portion of the sleeve. Then, the end surface of the fixture opposite to the detection region is brought into contact with the screw amount setting portion formed at the step portion between the main tube portion and the tip tube portion, and the screw amount of the fixture with respect to the screw portion is reduced. Set to a predetermined amount. Subsequently, when the nut is screwed on the threaded portion of the main tube portion of the sleeve, the inner side surface of the fixture comes into contact with the side surface on the detection area side of the mounting plate, and the attachment is made between the fixture and the nut. A board is clamped. Thereby, the front end surface of the optical fiber is mounted and arranged at a predetermined position with respect to the outer surface of the mounting plate.

Therefore, the fiber head can be easily and accurately attached by always restricting the fiber head to a fixed position with respect to the attachment hole of the attachment plate.
According to a second aspect of the present invention, the screw portion on the tip of the sleeve is screwed into the screw hole of the fixture, and the tip surface is brought into contact with the screw amount setting portion formed in the screw hole of the fixture. The mounting plate is sandwiched between the mounting tool and the nut by rotating the nut screwed into the threaded portion on the sleeve.

  As described above, according to the present invention, the fiber head can be always attached to the mounting hole of the mounting plate while being regulated at a fixed position.

(First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS. 1-3.
As shown in FIGS. 1 and 2, the mounting plate 11 arranged corresponding to the detection region S is formed in a substantially L-shaped side surface, and a mounting hole 12 is formed in a flat vertical wall portion of the mounting plate 11. Is formed. The fiber head 13 is attached to the attachment hole 12 of the attachment plate 11 in a state where the fiber head 13 is inserted from the opposite side of the attachment plate 11 to the detection region S to the detection region S side. The fiber head 13 projects light toward the detection region S or receives light from the detection region S, and a metal sleeve 15 fitted to the tip of the optical fiber 14. It is composed of

  The optical fiber 14 is composed of a core material 14a made of a translucent fiber material and an outer skin 14b made of a non-translucent resin material coated on the outer surface of the core material 14a. The sleeve 15 is provided with a main tube portion 16 and a tip tube portion 17 that is integrally formed to project from the tip end side of the main tube portion 16 and has a smaller diameter than the main tube portion 16. Screw portions 16 a and 17 a are formed on the outer peripheral surfaces of the main tube portion 16 and the tip tube portion 17 of the sleeve 15, respectively.

  As shown in FIG. 1, in a state where the distal end cylindrical portion 17 of the sleeve 15 is inserted into the mounting hole 12 of the mounting plate 11, the screw portion 17a on the distal end cylindrical portion 17 of the sleeve 15 detects the mounting plate 11. A metal fitting 18 is screwed from the region S side. As shown in FIG. 2, the fixture 18 includes a pedestal portion 19 that can contact the side surface of the mounting plate 11 on the detection region S side, and a connecting cylinder portion 20 that can be inserted into the mounting hole 12 of the mounting plate 11. It is provided integrally. A screw hole 21 is formed in the center of the fixture 18 so as to be screwed into the screw portion 17a on the distal end cylindrical portion 17. Further, as shown in FIG. 3, a rectangular engaging portion 19 a such as a hexagonal shape for engaging a rotation prevention tool such as a spanner (not shown) is formed on the outer periphery of the pedestal portion 19.

  As shown in FIG. 2, the stepped portion at the boundary between the main tube portion 16 and the tip tube portion 17 has a predetermined amount of screwing of the screw portion 17 a of the tip tube portion 17 with respect to the screw hole 21 of the fixture 18. The screwing amount setting unit 16b is set. When the distal end surface 20a of the connecting tube portion 20 is brought into contact with the screwing amount setting portion 16b, the screwing amount between the tip tube portion 17 and the fixture 18 is set to a predetermined amount.

  As shown in FIG. 1, a metal nut 22 is screwed onto the screw portion 16 a on the main tube portion 16 of the sleeve 15 from the side opposite to the detection region S of the mounting plate 11. A spacer 23 having a function as a spring washer formed of metal, resin, rubber or the like is interposed between the side surface of the mounting plate 11 opposite to the detection region S and the nut 22 as necessary. . Then, in a state where the fixture 18 and the nut 22 are screwed to the threaded portions 17 a and 16 a on the distal end cylindrical portion 17 and the main cylindrical portion 16 of the sleeve 15, between the base portion 19 and the nut 22 of the fixture 18. The mounting plate 11 is configured to be sandwiched.

  As shown in FIG. 2, in this embodiment, the outer diameter D <b> 1 of the connecting cylinder portion 20 of the fixture 18 is formed to be larger than the outer diameter D <b> 2 of the main cylinder portion 16 of the sleeve 15. Further, the outer diameter D3 of the distal end cylindrical portion 17 is formed to be smaller than the outer diameter D2 of the main cylindrical portion 16. The axial length L1 of the screw hole 21 of the fixture 18 is formed to be substantially the same as the axial length L2 of the distal end cylindrical portion 17 of the sleeve 15. Furthermore, the axial length L3 of the connecting cylinder portion 20 of the fixture 18 is formed to be substantially the same as or slightly larger than the axial length L4 of the mounting hole 12.

Next, the operation for attaching the fiber head 13 to the attachment hole 12 of the attachment plate 11 in the fiber head 13 attachment structure configured as described above will be described.
When the fiber head 13 is attached, as shown in FIG. 2, the nut 22 is screwed in advance with the screw portion 16a on the main cylinder portion 16 of the sleeve 15, and the spacer 23 is inserted and arranged. In this state, the distal end cylindrical portion 17 of the sleeve 15 is inserted into the mounting hole 12 from the side opposite to the detection region S of the mounting plate 11 and the screw on the distal end cylindrical portion 17 of the sleeve 15 from the detection region S side of the mounting plate 11. The fixture 18 is screwed into the portion 17a. Then, as shown in FIG. 1, the distal end surface 20 a of the connecting cylinder portion 20 of the fixture 18 comes into contact with the screwing amount setting portion 16 b of the sleeve 15, and the fixture 18 and the sleeve 15 are integrated. Thereby, the front end surface of the optical fiber 14 in the fiber head 13 is disposed on substantially the same plane as the outer surface of the base 19 of the fixture 18.

  Thereafter, on the side opposite to the detection region S of the mounting plate 11, the nut 22 is screwed on the screw portion 16 a of the main tube portion 16 of the sleeve 15. Then, as shown in FIG. 1, the inner surface of the pedestal portion 19 of the fixture 18 is brought into contact with the side surface of the mounting plate 11 on the detection region S side, and between the pedestal portion 19 of the fixture 18 and the nut 22. The mounting plate 11 is clamped. Thereby, the front end surface of the optical fiber 14 in the fiber head 13 is attached and arranged at a predetermined position with respect to the outer surface of the attachment plate 11.

As described above, the fiber head 13 mounting structure of the first embodiment has the following effects.
(1) In the first embodiment, the sleeve 15 is formed by the large-diameter main cylinder portion 16 and the small-diameter tip cylinder portion 17, and the step portion at the boundary between the two is the screwing amount setting portion 16 b. Since the distal end surface 20a of the connecting tube portion 20 of the fixture 18 is brought into contact with the combined amount setting portion 16b, the screwing amount of the screw portion 17a of the distal end tube portion 17 with respect to the screw hole 21 is easily set to a predetermined amount. be able to. Further, the front end surface of the optical fiber 14 in the fiber head 13 is arranged on substantially the same plane as the outer surface of the fixture 18, and the pedestal 19 of the fixture 18 and the side surface of the mounting plate 11 when the nut 22 is tightened thereafter. With this contact, the tip surface of the optical fiber 14 is positioned at a predetermined position with respect to the outer surface of the mounting plate 11. Therefore, the fiber head 13 can be easily and accurately attached to the attachment hole 12 of the attachment plate 11 by always restricting the fiber head 13 to a fixed position.

  (2) In the first embodiment, since the fixture 18 is constituted by the pedestal portion 19 and the connecting cylinder portion 20, the side surface of the attachment plate 11 on the detection region S side in the attached state of the fiber head 13 to the attachment plate 11 Since only the pedestal 19 of the fixture 18 needs to protrude slightly, it is possible to prevent the object to be detected from interfering with this protruding portion.

  (3) In the first embodiment, a hexagonal engagement portion 19 a for engaging a rotation prevention tool such as a spanner is formed on the outer periphery of the pedestal portion 19 of the fixture 18. Therefore, when the fiber head 13 is attached to the attachment hole 12 of the attachment plate 11, a tool such as a spanner is engaged with the engagement portion 19a to hold the attachment 18 in a non-rotating state, and the nut 22 is moved in the screwing direction. It can be rotated.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment. The same applies to third to ninth embodiments described later.

  In the second embodiment, as shown in FIG. 4, the thickness of the mounting plate 11 is larger than that in the first embodiment, and the length L3 in the axial direction of the connecting tube portion 20 of the mounting tool 18 is increased. It is smaller than the length L4 of the mounting hole 12 in the axial direction. Even in such a case, the fiber head 13 can be attached to the attachment plate 11 using the fixture 18 having the same shape as that of the first embodiment.

Therefore, also in the second embodiment, substantially the same effect as that described in the first embodiment can be obtained.
(Third embodiment)
In the third embodiment, as shown in FIG. 5, the thickness of the mounting plate 11 is smaller than that in the first embodiment, and the length L3 in the axial direction of the connecting tube portion 20 of the mounting tool 18 is reduced. The mounting hole 12 is longer than the length L4 in the axial direction. The hole of the spacer 23 is larger than the outer diameter of the connecting cylinder portion 20. In this case, by installing a plurality of spacers 23 between the side surface of the mounting plate 11 opposite to the detection region S and the nut 22, the length L 4 in the axial direction of the mounting hole 12 and the mounting tool 18. The connecting cylinder portion 20 is aligned with the axial length L3.

  Therefore, also in the third embodiment, substantially the same effect as that described in the first embodiment can be obtained. Further, in the third embodiment, since a plurality of spacers 23 are used, the thickness of the mounting plate 11 changes, and the axial length L4 of the mounting hole 12 and the connecting tube portion of the mounting tool 18 are changed. Even when the length L3 in the axial direction of 20 does not match, the fiber head 13 can be attached to the attachment plate 11 using the fixture 18 having the same shape as that of the first embodiment.

(Fourth embodiment)
In the fourth embodiment, as shown in FIG. 6, the outer diameter D1 of the connecting cylinder portion 20 of the fixture 18 is formed to be smaller than the outer diameter D2 of the main cylinder portion 16 of the sleeve 15. Even in such a case, as in the first embodiment, the fixture 18 and the sleeve 15 can be integrated by screwing the fixture 18 into the screw portion 17a on the distal end cylindrical portion 17 of the sleeve 15. it can.

Therefore, also in the fourth embodiment, substantially the same effect as that described in the first embodiment can be obtained.
(Fifth embodiment)
In the fifth embodiment, as shown in FIG. 7, a tapered hole portion 12 a that gradually increases in diameter toward the detection region S side is formed on the inner peripheral surface of the mounting hole 12 of the mounting plate 11. Further, a tapered surface 19c that can be engaged with the tapered hole portion 12a of the mounting hole 12 is formed on the outer peripheral surface of the pedestal portion 19 of the mounting tool 18, and the outer surface of the pedestal portion 19 (the front end surface of the mounting tool 18). As shown in FIG. 8, engaging grooves 19b for engaging a tool such as a minus driver are formed so as to be orthogonal to two places.

  Therefore, also in the fifth embodiment, substantially the same effect as that described in the first embodiment can be obtained. In the fifth embodiment, as shown in FIG. 7, the fiber head 13 is attached to the attachment plate 11, and the taper surface 19 c of the base 19 and the taper hole 12 a of the attachment hole 12 are engaged with each other. The pedestal 19 of the fixture 18 is disposed in the mounting hole 12 without protruding from the side surface of the mounting plate 11 on the detection region S side. Therefore, it is possible to suppress a part of the fixture 18 from protruding from the side surface of the mounting plate 11 on the detection region S side, and to more effectively prevent the object to be detected from interfering with the protruding part. Can do. Furthermore, since the engaging groove 19b for engaging the minus driver is formed on the outer surface of the pedestal portion 19, the front end surface of the optical fiber 14 and the bottom surface of the engaging groove 19b are at the same position with respect to the axial direction of the optical fiber 14. Can be set. When forming a cross-shaped engagement groove for engaging a plus driver, it is necessary to consider the depth of the engagement groove so as not to damage the tip surface of the optical fiber 14 because the tip of the driver is tapered. However, in the case of the engagement groove 19b of this embodiment, there is no such trouble. In the case of a positive driver engaging groove, it is necessary to use a screwdriver of a suitable size, but the negative driver engaging groove 19b has a constant groove depth but a larger groove width. By setting, it is possible to operate even with drivers of different sizes.

(Sixth embodiment)
In the sixth embodiment, as shown in FIG. 9, in the first embodiment, a recess 12b for accommodating the pedestal 19 of the fixture 18 on the side surface of the mounting plate 11 on the detection region S side. Is forming. In the sixth embodiment, since the fixture 18 does not protrude from the side surface of the attachment plate 11 of the fixture 18 toward the detection region S, it is possible to more effectively prevent the object to be detected from interfering with the protruding portion. .

(Seventh embodiment)
In the seventh embodiment, as shown in FIG. 10, by forming a tapered surface 19c on the entire outer peripheral surface of the pedestal part 19 and the connecting cylinder part 20, the pedestal part 19 and the connecting cylinder part 20 are integrated into a truncated cone shape. Is formed. Further, an interference preventing flange 19d as an interference preventing portion for preventing the tool such as a driver from interfering with the inner peripheral surface on the tip end side of the screw hole 21 of the fixture 18 is integrally formed, and the inner periphery of the interference preventing flange 19d is formed. A tapered surface 19e having a larger diameter on the outer surface is formed on the surface. As shown in FIG. 11, the inclination angle α of the tapered surface 19e with respect to the axis O of the optical fiber 14 is set to be equal to or larger than the light emission opening angle (30 °) from the core 14a of the optical fiber 14.

  In the seventh embodiment, as compared with the fifth embodiment shown in FIG. 7, the outer end surface of the connecting tube portion 20 is not projected rearward from the tapered hole portion 12 a of the mounting plate 11, and thus the spacer 23 is omitted. You can also. Even if the tip of the minus driver is engaged with the engagement groove 19b, the tip surface of the driver is not brought into contact with the tip surface of the optical fiber 14 by the interference preventing flange 19d, and the tip surface is protected. Furthermore, since the inclination angle α of the tapered surface 19e is set to be equal to or greater than the emission opening angle (30 °), the light from the optical fiber 14 can be appropriately emitted to the detection region S.

(Eighth embodiment)
In the eighth embodiment, as shown in FIG. 12, the outer diameter of the sleeve 15 is made the same, and an annular shape as a screwing amount setting portion is formed on the inner peripheral surface of the tip end portion of the screw hole 21 of the fixture 18. Positioning protrusions 24 are provided. The positioning protrusion 24 is brought into contact with the distal end surface of the sleeve 15 for position regulation, and the screwing amount of the screw portion 17a of the distal end cylindrical portion 17 of the sleeve 15 with respect to the screw hole 21 of the fixture 18 is set to a predetermined amount. ing.

  In the eighth embodiment, the distal end surface of the optical fiber 14 is disposed axially separated from the outer surface of the pedestal portion 19 by the positioning projection 24, so that the distal end surface of the optical fiber 14 is damaged by other members. Can also be prevented.

(Ninth embodiment)
In the ninth embodiment, as shown in FIG. 13, the axial length of the fixture 18 is made shorter than the axial length of the tapered hole portion 12a of the mounting plate 11, and the sleeve 15 For example, a hexagonal positioning portion 15 a is formed integrally with the outer periphery of the distal end portion of the main cylinder portion 16 when viewed from the axial direction, and the positioning portion 15 a is in contact with the side surface of the mounting plate 11. The positioning portion 15a sets the amount of screw portion 17a of the tip tube portion 17 to be inserted into the mounting hole 12 to thereby set the screwing amount of the screw portion 17a on the tip tube portion 17 to the screw hole 21 by a predetermined amount. And a function as a screwing amount setting unit to be set. In the ninth embodiment, the positioning portion 15 a of the sleeve 15 is brought into contact with the side surface of the mounting plate 11 in a state where the tip surface of the tip tube portion 17 is in contact with the interference prevention flange 19 d of the pedestal portion 19. . In the ninth embodiment, the interference preventing flange 19d may be omitted. In this case, the attachment plate 11 is clamped and held between the fixture 18 and the positioning portion 15a.

  In the ninth embodiment, with the positioning portion 15a of the sleeve 15 held in a non-rotatable manner by a tool such as a wrench, a negative screwdriver is engaged with the engagement groove 19b of the pedestal portion 19 so that the pedestal portion 19 is moved. By rotation, the sleeve 15 and the fixture 18 are attached to the attachment plate 11. The sleeve 15 and the fixture 18 may be attached to the attachment plate 11 by rotating the sleeve 15 in a state where the fixture 18 is held unrotatable.

  In the ninth embodiment, since the nut 22 can be omitted, the number of parts can be reduced, the manufacturing can be facilitated, and the mounting work of the sleeve 15 and the mounting tool 18 to the mounting plate 11 can be easily performed. .

(Example of change)
In addition, each said embodiment can also be changed and actualized as follows.
In the third embodiment shown in FIG. 5, the spacer 23 having a large plate thickness is used without using a plurality of spacers 23.

  -In 7th Embodiment shown in FIG. 10, the said interference prevention flange 19d may be abbreviate | omitted and the screw hole 21 may be formed. In this case, a predetermined interval is formed in the axial direction of the optical fiber 14 between the front end surface of the optical fiber 14 and the bottom surface of the engagement groove 19b. This interval functions as an interference prevention unit for preventing the tool engaged in the engagement groove 19b from interfering with the tip of the optical fiber 14.

  -In 8th Embodiment shown in FIG. 12, you may apply the structure of the recessed part 12b of 6th Embodiment shown in FIG. Similarly, in the eighth embodiment shown in FIG. 12, instead of the attachment hole 12 and the attachment 18 of the attachment plate 11, the tapered hole portion 12a and the tapered attachment of the attachment plate 11 of the seventh embodiment shown in FIG. 18 may be applied. Further, in the eighth embodiment shown in FIG. 12, the tapered hole portion 12 a and the fixture 18 of the ninth embodiment shown in FIG. 13 may be applied instead of the fixture 18.

  -In 9th Embodiment shown in FIG. 13, you may apply the structure of the recessed part 12b of 6th Embodiment shown in FIG. Similarly, in the ninth embodiment shown in FIG. 13, the fixture 18 of the first embodiment shown in FIG. 1 may be applied instead of the mounting hole 12 and the fixture 18 of the mounting plate 11, and the positioning portion 15a may be applied to the positioning portion 15a. Instead, the sleeve 15 having the main cylinder part 16 and the tip cylinder part 17 provided with the screw part 16a of the first embodiment shown in FIG. 1 and the nut 22 may be used.

-Although not shown in figure, as the optical fiber 14 of a reflection type photoelectric sensor, you may use what coat | covered the core material 14a with the outer skin 14b.
The attachment 18 may be attached to the attachment plate 11 by rotating the attachment 18.

In the eighth embodiment shown in FIG. 12, the inner peripheral surface of the positioning protrusion 24 may be formed as a tapered surface having a larger diameter toward the outer side, like the tapered surface 19 e of the pedestal portion 19.
-As the mounting plate 11, in addition to the L-shaped one, for example, a U-shaped one, a simple flat plate, or a portion to which the fixture 18 is attached is a flat plate and the other portion has an arbitrary shape. It may be used.

Sectional drawing which shows the attachment structure of the fiber head of 1st Embodiment. FIG. 2 is an exploded cross-sectional view of the fiber head mounting structure of FIG. 1. The front view of the fixture used for the attachment structure of the same fiber head. Sectional drawing which shows the attachment structure of the fiber head of 2nd Embodiment. Sectional drawing which shows the attachment structure of the fiber head of 3rd Embodiment. Sectional drawing which shows the attachment structure of the fiber head of 4th Embodiment. Sectional drawing which shows the attachment structure of the fiber head of 5th Embodiment. The front view of the fixture used for the attachment structure of the fiber head of FIG. Sectional drawing which shows the attachment structure of the fiber head of 6th Embodiment of this invention. Sectional drawing which shows the attachment structure of the fiber head of 7th Embodiment of this invention. Sectional drawing which shows the fixture of 7th Embodiment. Sectional drawing which shows the attachment structure of the fiber head of 8th Embodiment of this invention. Sectional drawing which shows the attachment structure of the fiber head of 9th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS S ... Detection area | region, 11 ... Mounting plate, 12 ... Mounting hole, 12a ... Tapered hole part, 12b ... Recessed part, 13 ... Fiber head, 14 ... Optical fiber, 15 ... Sleeve, 15a ... Positioning part as screwing amount setting part 16 ... main cylinder part, 16a, 17a ... screw part, 16b ... screwing amount setting part, 17 ... tip cylinder part, 18 ... fixture, 19 ... pedestal part, 19a ... engagement part, 19b ... engagement groove, 19c, 19e ... tapered surface, 19d ... interference prevention flange as an interference prevention part, 20a ... tip surface of the connecting cylinder part 20 as a screwing amount setting part, 21 ... screw hole, 22 ... nut, 23 ... spacer.

Claims (9)

An attachment structure for attaching a fiber head having a sleeve fitted to the outer periphery of the tip of an optical fiber in a state of being inserted into an attachment hole of an attachment plate provided at a predetermined position,
The sleeve includes a main tube portion having a thread portion formed on an outer periphery thereof, a tip tube portion projecting on a tip side of the main tube portion and having a smaller diameter than the main tube portion having a screw portion formed on an outer periphery thereof. Provided,
A fixture having a screw hole that is screwed into a screw portion on the tip cylindrical portion from the detection region side of the mounting plate in a state where the tip cylindrical portion of the sleeve is inserted into the mounting hole of the mounting plate;
The stepped portion between the main tube portion and the tip tube portion is a screw amount setting portion for setting the screw amount of the screw portion on the tip tube portion to the screw hole of the fixture to a predetermined amount,
A nut that is screwed onto a screw portion on the main tube portion of the sleeve from the opposite side of the detection region of the mounting plate;
The mounting plate is sandwiched between the mounting tool and the nut in a state where the mounting tool is screwed to the threaded portion of the distal end cylindrical portion of the sleeve and the nut is screwed to the threaded portion on the main cylindrical portion. A fiber head mounting structure characterized by being made. An attachment structure for attaching a fiber head having a sleeve fitted to the outer periphery of the tip of an optical fiber in a state of being inserted into an attachment hole of an attachment plate provided at a predetermined position,
A threaded portion is formed on the outer periphery of the sleeve,
A fixture having a screw hole that is screwed into a screw portion on the tip of the sleeve from the detection region side of the mounting plate in a state where the tip of the sleeve is inserted into the mounting hole of the mounting plate;
Threading that is formed corresponding to the tip end portion of the screw hole of the fixture and that positions the tip end surface of the sleeve and sets the screw amount of the screw portion at the tip end of the sleeve to the screw hole of the fixture to a predetermined amount. An amount setting section;
A nut screwed into the threaded portion of the sleeve from the opposite side of the mounting plate detection area;
In a state where the screw portion at the tip of the sleeve is screwed into the screw hole of the fixture, and the nut is screwed into the screw portion of the sleeve, the mounting plate is interposed between the fixture and the nut. A fiber head mounting structure characterized by being sandwiched.   3. The fiber head mounting structure according to claim 1, wherein a spacer is interposed between a side surface of the mounting plate opposite to the detection region and the nut. The mounting hole of the mounting plate is formed with a tapered hole portion that gradually increases in diameter toward the detection region side, and a tapered surface that can be engaged with the tapered hole portion of the mounting hole is formed on the outer peripheral surface of the mounting tool. The attachment structure of the fiber head as described in any one of Claims 1-3 characterized by these. The concave portion for accommodating the bowl-shaped base part formed in the front-end | tip outer peripheral part of the said fixture is formed in the side surface by the side of the detection area of the said mounting plate of Claims 1-4 characterized by the above-mentioned. The fiber head mounting structure according to any one of the above. An engagement groove capable of engaging with a tool is formed on the distal end surface of the fixture, and the tool engaged with the engagement groove interferes with the distal end of the optical fiber on the inner periphery of the distal end portion of the screw hole of the fixture. The fiber head mounting structure according to any one of claims 1 to 5 , further comprising an interference preventing portion for preventing the interference. The interference prevention portion is an interference prevention flange formed on the inner periphery of the tip end of the screw hole of the fixture, and an inner peripheral surface of the flange is formed with a tapered surface having a larger diameter toward the outer side. The fiber head mounting structure according to claim 6 . It is a fixture used for the attachment structure of the fiber head according to any one of claims 1 to 7 ,
An attachment for use in a fiber head attachment structure, wherein an engagement groove for engaging a rotary tool is provided on a tip surface of the attachment. 9. The fixture used in the fiber head mounting structure according to claim 8 , wherein a square engagement portion for engaging a rotary tool is provided on an outer peripheral surface of the fixture.

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