JPH0623142U - Optical fiber holding device for photoelectric switch - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an optical fiber holding device in which the tip of the optical fiber 21 can be fixed accurately and easily, and the optical axis can be aligned very easily. [Structure] A recess 2 is formed on the end face for mounting and fixing the optical fiber 21.
8 and a holder 23 formed of a substantially V-shaped elastic member. The optical axis rod 33 is provided in a recess 28 provided on the end surface of the mounting member 27 with the mounting member 27 facing each other.
The mounting member 27 is positioned and fixed by bridging the
The holder 2 in which the optical fiber 21 is sandwiched is provided with an engaging portion having a concave-convex relationship inside the recess 28 of 7 and the outer surface of the holder 23.
3 is fitted and fixed in the recess 28 of the mounting member 27.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical fiber type photoelectric switch for detecting an object to be detected, and more particularly to an optical fiber holding device for a photoelectric switch that positions and fixes the tip of an optical fiber on the object to be detected.

[0002]

[Prior art]

 Conventionally, in the optical fiber holding device of this type of photoelectric switch, as shown in FIG. 6, a through hole 4 is provided in the central portion of the mounting member 3 and the fixture 2 at the end of the optical fiber is inserted, and the through hole 4 The mounting member 3 is fixed while aligning the optical axis in a state where a continuous female screw is provided above and the fixing screw 5 is screwed and fixed. As another embodiment, as shown in FIG. 7, a mounting hole 15 is provided on one surface of an L-shaped mounting member 14, and a screw is formed in a part of the optical fiber 11 in the mounting hole 15. The fixture 12 was inserted, the detection end of the optical fiber 11 was positioned on the object to be detected, and the nut 17 was tightened and fixed.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional optical fiber holding device for the photoelectric switch, the distance between the detection end of the optical fiber 11 and the detection target and the left and right are adjusted and fixed, so that it is difficult to position the L-shaped mounting member 14. , Was spending a lot of time on its installation work. Since the tip of the optical fiber 11 can be moved in a straight line, adjustment up to the detection target can be easily performed, but since adjustments such as left and right are not possible, it is necessary to perform adjustment using a mounting member. I spent a lot of time adjusting the axes. SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical fiber holding device for a photoelectric switch, which eliminates the above-mentioned problems, allows the tip of an optical fiber to be fixed accurately and easily, and can be compactly constructed.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention relates to a photoelectric switch in which an optical fiber is connected in a case body provided with a light emitting element and a light receiving element, and an object to be detected is detected at the tip of the optical fiber. In the optical fiber holding device, the optical fiber holding device comprises a mounting member having a recess on the end surface for mounting and fixing the optical fiber, and a holder formed of a substantially V-shaped elastic member. The mounting member is opposed to the inside of the recess of the mounting member. The mounting member is positioned and fixed by bridging the optical axis rod to the mounting member, and an engaging portion having a concave-convex relationship is provided in the recess of the mounting member and the outer surface of the holder, and the holder holding the optical fiber is recessed. It is designed to fit inside the facility.

[0005]

[Action]

 According to the present invention, as described above, the distance between the detection target and the detection end of the optical fiber is determined, the mounting members are arranged facing each other, and the optical axis rod is provided in the recess provided in the end surface of the mounting member. And the optical axis is aligned to fix the mounting member. Then, a holder in which an optical fiber fixing tool is sandwiched is fitted and fixed in the facing recesses of the mounting member. Further, the optical fiber can be easily removed by pressing the upper end of the V-shaped holder so as to pull it up.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a sectional view of an essential part of an optical fiber holding device showing a first embodiment of the present invention, FIG. 2 is a perspective view of the essential part thereof, and FIG. 3 is an optical fiber showing an optical axis alignment of the first embodiment of the present invention. FIG. 4 is a perspective view of the holding device, and FIG. 4 is a perspective view showing its attached state. 1 to 4 show that an elliptical mounting hole 31 fixed by a mounting screw 32 is provided in the vicinity of an object to be detected on the plane of the mounting member 27 bent into an L shape, and the upper end in the vertical direction is provided. A recess 28 is formed on the inner surface of the recess 28, and a protrusion 29 is provided on the inner surface of the recess 28 as an engaging portion to be fitted into a holder 23, which will be described later, in a concave-convex relationship. The holder 23 is formed by a substantially V-shaped elastic member, and a recess 24 for sandwiching the fixture 22 of the optical fiber 21 is provided in the V-shaped elastic member, and the V-shaped outer surface of the mounting member 27 is provided. A step portion 25 that engages with a protrusion 29 provided on the inner surface of the recess 28 is provided. By inserting the fixture 22 of the optical fiber 21 into the recess 24 of the holder 23 thus configured and pushing it from above the recess 28 of the mounting member 27, the protrusion 29 in the recess 28 of the mounting member 27 is The step portion 25 provided on the outer side surface of the holder 23 engages with the concave and convex portions, and the fixture 22 of the optical fiber 21 is sandwiched. By narrowing both ends of the V-shaped holder 23, the engagement portion between the step 25 of the holder 23 and the protrusion 29 in the recess 28 of the mounting member 27 is released, and the holder 23 moves upward. Removed. The holder 23 is formed so as to be attachable to and detachable from the recess 28 of the mounting member 27.

FIG. 3 is a perspective view showing optical axis alignment according to the first embodiment of the present invention. In the structure of the optical fiber holding device shown in FIG. 1 and FIG. 2, when the light emitting side and the light receiving side optical fibers 21 are opposed to each other and the space between them is set as the detection target, the detection target is detected. The mounting member 27 is arranged to face each other in the vicinity of, and the optical axis rod 33 is inserted into the concave portion 24 of the V-shaped holder 23, and the holder 23 is fitted into the respective concave portions 28 of the mounting member 27 due to the concavo-convex relationship. Then, the optical axis rod 33 is bridged, and the mounting member 27 is fixed in this state, and the optical axis alignment is completed. Then, both ends of the V-shaped holder 23 are closed to remove the optical axis rod 33, and the optical fibers 21 on the light-emitting side and the light-receiving side are inserted into the concave portions 24 of the V-shaped holder 23 for mounting. It is inserted and fixed in the recess 28 of the member 27. After performing the optical axis alignment as described above, the both ends of the left and right holders 23 are narrowed to remove the optical axis rods 33, and the fixtures 22 of the optical fibers 21 are inserted into the recesses 24 of the respective holders 23 to be attached. The concave and convex engagement of the recess 28 of the member 27 completes the setting as shown in FIG. Further, a recess for fixing the optical fiber and a recess for engaging the optical axis rod for aligning the optical axis may be provided respectively on the end surface of the mounting member. Further, a plurality of optical axis rods may be engaged. With this setting, the position of the mounting member can be set more easily.

FIG. 5 is a perspective view of an optical fiber holding device according to a second embodiment of the present invention, in which fixtures 42 for a plurality of optical fibers 41 are arranged. The configuration is the same as that shown in FIG. A recess is provided at the upper end of the mounting member 45, and a protrusion 46 is formed in this recess. Then, the fixture 42 of the optical fiber 41 is inserted into the recess of the holder 43 formed in a substantially V shape, and the fixture 42 is engaged and recessed in the recess of the mounting member 45 to fix the installation. In this embodiment, three optical fibers 41 are provided, but the optical fibers 41 may be fixed if necessary. In the embodiment of the present invention, the optical fiber fixture is fixed by providing a recess at the upper end of the mounting member, but it is also possible to provide a recess at the side end of the mounting member for fixation. Various mounting members can be selected depending on the situation in the vicinity of the object to be detected. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[0009]

[Effect of device]

 As described in detail above, according to the present invention, the following effects can be obtained. (1) The mounting member is positioned and fixed by bridging an optical axis rod in the recess of the mounting member, and an engaging portion having a concave-convex relationship is provided between the recess of the mounting member and the outer surface of the holder. Since the holder sandwiching the is inserted into the recess, the mounting member can be easily positioned, and the optical fiber can be mounted with one touch, so that the optical axis alignment of the optical fiber and the optical fiber mounting work can be performed. There is an effect that can be done very easily. (2) The mounting member is positioned and fixed by bridging an optical axis rod in the recess of the mounting member, and an engaging portion having an uneven relationship is provided on the outer surface of the holder in the recess of the mounting member. Since the holder that holds the optical fiber is fitted into the recess, the optical fiber holding device for the photoelectric switch can be provided, which can serve as the optical axis aligning means and the fixing means for the optical fiber, and which has an extremely simple structure and is inexpensive. (3) The mounting member is positioned and fixed by bridging the optical axis rod in the recess of the mounting member, and the inside of the recess of the mounting member and the outer surface of the holder formed by the substantially V-shaped elastic member are formed by the uneven relationship. The optical fiber can be attached / detached by providing the engaging portion and fitting the holder holding the optical fiber in the recess, and by closing both ends of the holder formed in a substantially V shape without removing the mounting member. Since it is possible, there is an effect that optical fiber replacement and maintenance work can be easily performed. (4) Since the guide groove is provided so that the inside of the recess of the mounting member and the outer side surface of the holder engage with each other, positioning of the optical fiber is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an optical fiber holding device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an essential part of the optical fiber holding device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of an optical fiber holding device showing optical axis alignment according to the first embodiment of the present invention.

FIG. 4 is a perspective view of an optical fiber holding device according to a first embodiment of the present invention.

FIG. 5 is a perspective view of an essential part of an optical fiber holding device according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a conventional optical fiber holding device.

FIG. 7 is a sectional view of a main part of a conventional optical fiber holding device.

[Explanation of symbols]

 21 optical fiber 22 fixture 23 holder 24 recess 25 step 26 protrusion 27, 45 mounting member 28 recess 29, 46 protrusion 30, 47 guide groove

Claims (2)

[Scope of utility model registration request] 1. An optical fiber holding device of a photoelectric switch, wherein an optical fiber is connected to a light emitting element and a case main body in which the light emitting element is arranged, and a tip of the optical fiber detects an object to be detected. The mounting member includes a mounting member having a recess on the end face to be fixed and a holder formed of a substantially V-shaped elastic member. An optical fiber of a photoelectric switch in which a member is positioned and fixed, an engaging portion having an uneven relationship is provided on an outer surface of the holder in a recess of the mounting member, and a holder holding the optical fiber is fitted in the recess. Holding device. 2. The optical fiber holding device for a photoelectric switch according to claim 1, wherein a guide groove is provided in a concave portion of the mounting member and an outer surface of the holder in a concave-convex relationship.