JPH0517526U - Receptacle structure for optical fiber - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is designed to selectively attach the attachment of the insertion tube portion according to the outer diameter of the ferrule attached to the terminal in order to measure the light amount of the optical fiber cord. It is possible to measure accurately with one measuring device. [Constitution] The present invention comprises a receptacle main body fixed to a measuring device and an attachment detachably attached to the main body of the receptacle, and the outer diameter of the ferrule attached to the end of the optical fiber cord to measure the light quantity. Depending on the situation, the attachment of the insertion tube is selected and attached.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention connects the ferrule attached to the terminal to a predetermined measuring device in a stable posture in order to measure the light quantity of the optical fiber cord used for optical communication, etc., and repeats the measurement of the light quantity. It is about the receptacle structure used to do well.

[0002]

[Prior Art]

 As the receptacle structure in this type of measuring apparatus, for example, the structure shown in FIGS. 3 to 5 is well known as a conventional example. In this conventional example, it is composed of a receptacle main body 12 which is erected on a base portion 14 and provided with a tubular portion 15, and an attachment 13 which is attached to the tubular portion 15 of the receptacle main body 12 so as to be detachably attached. To describe this structure in more detail, the receptacle body 12 is attached to an appropriate light quantity measuring device 11, and the receptacle body 12 is mounted on a base portion 14 for attachment and vertically rises from the base portion 14 to be an internal portion. And a cylindrical portion 15 penetrating therethrough, a male screw portion 16 is formed near the lower end of the cylindrical portion 15, and a lens body 17 is attached to the upper inside of the cylindrical portion 15 by, for example, an adhesive means. Be done. The lens body 17 is designed so that parallel light strikes the lower end 15b of the tubular portion 15 when light is incident on the center of the light incident surface 17a.

The attachment 13 has a tubular shape as a whole, the diameter thereof is expanded from one end side (the lower end side in the drawing) to about a third depth, and the other portion (upper portion) is inserted into the attachment tube. The mounting cylinder portion 19 has an inwardly facing flange portion 19a for locking a precision sleeve 21 described later, and the enlarged outer peripheral surface is knurled to form the knob portion 18. Has been done. A female screw portion 20 is engraved on the enlarged inner portion.

A precision sleeve 21 is provided inside the attachment 13, and the precision sleeve 21 is provided with a slit 22 in the longitudinal direction, and has an outer diameter equivalent to that of the tubular portion 15 of the receptacle body 12. It is possible to keep the ferrules with completely on the same line. Then, the precision sleeve 21 is inserted from the side of the knob portion 18 to be positioned inside the insertion tube portion 19, and the stopper 23 is screwed to the appropriate position by the female screw portion 20 to stably position in the loose fitting state. I am allowed to do it. In this case, the stopper 23 is formed with a flange portion 23a for supporting the end portion of the precision sleeve 21 so as to project inward.

As shown in FIG. 4, the attachment 13 formed as described above is attached by screwing the female screw portion 20 and the male screw portion 16 so as to cover the receptacle body 12. As shown in FIG. 5, the attachment 13 is applicable to the outer diameter of the ferrule 26 of the plug 25 attached to the end of the optical fiber cord 24 to be measured is φ2.5, for example. The inner diameter of the precision sleeve 21 is formed to have a diameter substantially corresponding thereto.

That is, when the ferrule 26 of the optical fiber cord 24 to be measured is inserted and attached from the side of the attachment tube portion 19 of the attachment 13, the ferrule 26 is pushed in so that the precision sleeve 21 is slightly pushed open. The shrinking force of the precision sleeve 21 causes a full frictional engagement with the ferrule 26, and the end of the optical fiber code 24 faces the lens body 17 of the receptacle body 12 to prevent rattling. There is no stable insertion, which makes it possible to measure an appropriate amount of light.

[0007]

[Problems to be solved by the device]

 If the conventional receptacle is used, light must enter the center of the light entrance surface 17a of the lens body 17. For example, when the diameter of the ferrule 26 is φ2.5, the inner surface of the precision sleeve 21 is Is cylindrical, the outer diameter of the cylindrical portion 15 of the receptacle body 12 needs to be approximately φ2.5. Further, for example, when the diameter of the ferrule is φ1.25, the outer diameter of the cylindrical portion 15 of the receptacle body 12 needs to be approximately φ1.25. Therefore, when measuring the light quantity with the light quantity measuring device 11 (see FIG. 3), in the conventional receptacle configuration, the receptacle body 12 must be replaced if the diameter of the ferrule is different. Have

[0008]

[Means for Solving the Problems]

 As a concrete means for solving the above-mentioned problems of the conventional example, the present invention provides a receptacle main body having a cylindrical portion erected on a base portion, and an attachment detachably attached to the cylindrical main body portion of the receptacle main body. The attachment consists of an attachment that selects the attachment according to the outer diameter of the ferrule to be attached to the end of the optical fiber cord to be measured, and can measure the light intensity of different diameter ferrules without replacing the receptacle body. It provides an optical fiber receptacle structure to enable this.

[0009]

[Action]

 The present invention can connect multiple ferrules with different diameters immediately by selecting and attaching an attachment that can accept the diameter of the ferrule attached to the optical fiber cord to one type of receptacle body. Since the measurement can be performed, there is an advantage that not only the work can be performed promptly, but also it is not necessary to prepare a plurality of receptacle bodies.

[0010]

【Example】

 Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. For ease of understanding, the same parts as those of the conventional example are designated by the same reference numerals, and the details thereof will be omitted. In the figure, a receptacle body 12 is attached to a light quantity measuring device 11. In this case, the receptacle main body 12 is the same as the conventional one. Therefore, the receptacle body 12 is composed of a mounting base portion 14, a tubular portion 15, a male screw portion 16 and a lens body 17 (see FIG. 3).

The attachment 13a that is detachably attached to the receptacle body 12 has a tapered tubular shape, and has a knob 18, an insertion tube portion 19b, and an internal thread portion 20, and a sleeve is attached to the insertion tube portion 19b. The construction is substantially the same as that of the conventional example in that 21a is inserted by a stopper 23.

The outer diameters of the knob portion 18 and the insertion tube portion 19b are the same as those of the conventional example, but the length of the insertion tube portion 19b is reduced to about half, and the inside A precision sleeve 27 having a smaller diameter is fitted into the sleeve 21a so that the entire length is substantially the same as that of the conventional example.

The precision sleeve 27 has an inner diameter of, for example, approximately φ1.25, and by attaching a plug 25a having a ferrule 26a having a diameter corresponding to this, a finer ferrule diameter than the conventional example can be obtained. It is possible to measure the amount of light of the optical fiber cord 24 that it has.

As shown in FIG. 1, the attachment 13a covers the receptacle body 12 in place of the attachment 13 of the conventional example, and includes the female screw portion 20 of the attachment 13a and the male screw portion 16 of the receptacle body 12. It can be screwed and mounted. The sleeve 21a and the precision sleeve 27 are integrally press-fitted to each other, and the end portion of the sleeve 21a that is press-fitted tightly is locked to the inner flange portion 19a of the insertion tube portion 19b. Therefore, the precision sleeve 27 has a structure protruding outward from the insertion tube portion 19b.

As shown in FIG. 2, when the ferrule 26 a of the optical fiber cord 24 is inserted into the precision sleeve 27 of the attachment 13 a having the above structure, the end of the ferrule 26 a faces the lens body 17. In addition, a stable insertion with no rattling is performed, which enables accurate measurement of the light amount.

In any case, the receptacle body 12 is fixed to the light quantity measuring device 11, and the receiving side of the attachment 13a attached thereto, that is, the insertion tube portion 19b side including the sleeve 21a and the precision sleeve 27, If multiple diameters of various diameters are prepared, even if the diameter of the ferrule 26a of the plug 25a connected to the optical fiber cord 24 to be measured is different, as long as the attachment member 13a is replaced, Immediate and accurate measurement is possible.

[0017]

[Effect of the device]

 As described above, the optical fiber receptacle structure according to the present invention has a different diameter so that it can be detachably attached to the receptacle body that is erected on the base portion and provided with the tubular portion. Even if the diameter of the ferrule of the plug attached to the end of the optical fiber cord to be measured by using the attachment made of the sleeve is different, as long as the corresponding attachment is replaced, the ferrule of the optical fiber cord is replaced. It has an excellent effect that it can be attached to the attachment to measure accurately.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an attachment according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which an attachment according to the present invention and a receptacle body are combined and a ferrule is inserted.

FIG. 3 is a sectional view showing the receptacle body and the attachment separately.

FIG. 4 is a sectional view showing a conventional attachment and a receptacle body separately.

FIG. 5 is a cross-sectional view showing a state in which a conventional attachment and a receptacle body are combined and a ferrule is inserted.

[Explanation of symbols]

 11 Measuring device 12 Receptacle body 13a Attachment 14 Base part 15 Cylindrical part 16 Male screw part 17 Lens body 17a Light entrance surface 18 Picking part 19a Inward flange part 19b Inserting cylinder part 20 Female screw part 21a Sleeve 22 Slit 23 Stopper 23a Flange part 24 Optical Fiber Cord 25a Plug 26a Ferrule 27 Precision Sleeve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Iwano 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Yasuhiro Ando 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Toshiaki Nakano 6-18-12 Meguro Honcho, Meguro-ku, Tokyo Honda Communication Industry Co., Ltd. (72) Hiromasa Okamura 6-18-18 Meguro-honmachi, Meguro-ku, Tokyo No. 12 Honda Communication Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A receptacle main body having a cylindrical portion that is erected on a base portion and an attachment that is detachably attached to the cylindrical portion of the receptacle main body. The attachment is measured. An optical fiber receptacle structure that allows the attachment of the insertion tube to be selected and attached according to the outer diameter of the ferrule attached to the end of the optical fiber cord.