JPH0544758Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light-shielding cap that is provided in an optical measuring instrument such as an optical power meter and covers the tip of an optical connector.

[Prior Art] An optical measuring device that measures the optical signal level of an optical fiber is provided with an optical connector for connecting an optical fiber that is an object to be measured.

When the optical connector is not in use, a cap is usually attached to the tip of the optical connector in order to prevent dust from entering the connector and to prevent unnecessary operation of the circuit due to the entrance of light.

Conventionally, this cap has been formed of plastic or metal into a cylindrical shape with a bottom, and has been fitted or screwed onto the tip of the optical connector. In addition, this cap did not function as an inclined foot.

[Problems to be Solved by the Invention] However, the conventional light-shielding cap as described above has a problem in that it is easily lost when removed because it is separate from the optical measuring device.

Furthermore, the light-shielding cap must be formed to match the shape and dimensions of the optical connector, and one light-shielding cap cannot be shared by many types of optical connectors.

The present invention was developed in view of the above problems, and can be used in common with many types of optical connectors, can be easily attached and detached without losing it, and can also be used as an inclined foot when measuring on a horizontal surface. The purpose is to provide a functional light-shielding cap.

[Means for Solving the Problems] A configuration for achieving the above object will be described with reference to drawings corresponding to embodiments.

The light-shielding cap according to the present invention is a light-shielding cap that covers the tip 4a of an optical connector provided in an optical measuring instrument 1 that measures the optical signal level of an optical fiber, and the optical connector 4 of the optical measuring instrument 1 is attached to the cap. A support shaft 17 is provided on the side surface of the optical connector 4, and the caps 5 and 6, each having an elastic member 15 mounted therein, are movable within a predetermined range in the axial direction of the optical connector 4 via the support shaft 17. The optical measuring instrument is provided so as to be rotatable when pulled out, and when the caps 5 and 6 are rotated, the height of the caps 5 and 6 becomes higher than the optical measuring instrument 1, and the entire optical measuring instrument 1 is tilted, and the cap is rotated. 5 and 6 are pressed in, the elastic member 15 comes into contact with the tip 4a of the optical connector 4 to seal it.

[Function] According to the above means, since the caps 5 and 6 are attached to the optical measuring instrument 1 so as to be movable only within a predetermined range in the axial direction of the optical connector 4, the caps 5 and 6
will not fall off from the optical connector 4.

Furthermore, when connecting the optical connector on the optical fiber side of the object to be measured to the optical connector 4, the tip 4a of the optical connector 4 can be easily projected to the outside of the caps 5 and 6 by pulling out and rotating the cap. This makes it easy to connect and disconnect optical connectors.

Moreover, since the end portion 4a of the optical connector 4 is closed by bringing the elastic member 15 mounted in the caps 5 and 6 into contact with the end portion 4a,
Even optical connectors 4 of different types can be reliably closed.

[Embodiment] Hereinafter, an embodiment of the light-shielding cap according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2.

In FIG. 1, a light-emitting side optical connector section 2 and a light-receiving side optical connector section 3 are detachably attached to the front surface of an optical measuring instrument 1 in parallel.

These optical connector parts 2 and 3 are respectively connected to a light emitting element and a light receiving element (not shown) provided in the optical measuring instrument 1, and an optical connector 4 is attached to each of the optical connector parts 2 and 3. There is.

Note that the light-emitting side optical connector is not shown in the drawing because it is covered with the cap 5. A cap 6 is detachably attached to the light-receiving optical connector 4 as well, and the cap 6 consists of a pair of parallel side walls 7 and a semi-cylindrical portion 8 connecting these side walls 7. .

Long grooves 9 are formed at opposing positions on the inner surfaces of these side walls 7, respectively. As shown in FIG. 2, the depth of this long groove 9 is slightly deeper on the end side 9a of the side wall 7, and the side on the semi-cylindrical portion 8 side is formed in the shape of a slope 9c that gradually becomes deeper via a stepped portion 9b. ing.

Furthermore, a groove 10 parallel to the long groove 9 and a groove 11 perpendicular to the long groove 9 are formed on the inner surface of the open end side of the side wall 7, and a groove 12 is formed along the lower edge of the inner surface of the side wall 7. . A groove 13 perpendicular to the groove 12 is formed near the open end of the groove 12 .

Further, a prismatic protrusion 14 is formed on the side wall 7 on the side of the semi-cylindrical portion 8 . These grooves 10,1
1, 12, 13 and the projections 14 are formed at symmetrical positions on the inner surfaces of the pair of left and right side walls 7, respectively. Furthermore, an elastic member 15 made of rubber or the like having a predetermined thickness is fixed within the semi-cylindrical portion 8.

Note that reference numeral 16 is a groove that serves as a clue when attaching and detaching the cap 6. Further, the cap 5 on the light emitting side has a similar structure, but the elastic member 15 may be omitted.

On the other hand, near the tip of the side wall 1a of the optical measuring device 1 on both sides of the optical connector parts 2, 3, a supporting shaft 17 is provided protrudingly at a position where it can be engaged with the long groove 9. A groove 18 that engages with the protrusion 14 is formed.

Further, the cap 6 is attached to the side wall 1a, and the optical measuring device 1 is connected to the side wall 1a.
A stepped portion 1b is formed on which the open end of the side wall 7 comes into contact to determine the position when the cap is mounted on the cap. Protrusions 19 and 20 that engage with each other are provided.

When the cap 6 is attached to the optical measuring instrument 1, these projections 19, 20 and groove 18 engage with the grooves 10, 11 and the projection 14, respectively, so that the cap 6 is attached to the optical measuring instrument 1. It is designed to be positioned and fixed at 1. The side wall of the light measuring device 1 on the light emitting side also has a similar configuration.
Note that the reference numeral 21 is a switch, and the reference numeral 22 is a display section.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 and 4.

When attaching the cap 6 to the optical measuring instrument 1, push out the side wall 7 in the direction of arrow A shown in FIG.
engage.

When closing the tip 4a of the optical connector 4 with the cap 6, push the cap 6 in the direction of arrow B shown in FIG. 14 are protrusions 19, 20 and grooves 18 on the optical measuring device 1 side, respectively.
The cap 6 is positioned and fixed. At this time, the elastic member 15 fixed within the cap 6 abuts against and presses the tip end 4a of the optical connector 4, thereby elastically closing it.

On the other hand, when detaching the cap 6 from the optical connector 4, the cap 6 is pulled out in the direction shown by arrow C in FIG. 3a. At this time, the cap 6 is
The recessed groove 9 is guided and moved, and the support shaft 17 is fitted into the end 9a of the recessed groove 9 at the drawn-out end.

Next, the cap 6 is rotated about the support shaft 17 in the direction shown by arrow D in FIG.
At this time, the protrusion 19 on the optical measuring device 1 side is connected to the cap 6.
The cap 6 is positioned and fixed by engaging with the groove 13 formed in the cap.

In this state, the tip 4 of the optical connector 4
A protrudes outward between the side walls 7 of the cap 6, and can be connected to an optical connector (not shown) on the side of the object to be measured. In this case, when the optical measuring instrument 1 is placed on the stand 23, it is supported by the cap 6, making it easy to attach and detach the optical connector.

When attaching the cap 6 to the optical measuring instrument 1, the above-mentioned procedure may be performed in reverse order. The same applies to the function of the cap 5 on the light emitting side.

According to this embodiment, the cap 6 is always supported by the optical measuring device 1 via the support shaft 17 and the groove 9, so it will never be lost. Further, since the tip end 4a of the optical connector 4 is closed by surface contact with the elastic member 15, even if the optical connector 4 is replaced with another optical connector 4 of a different size and length, the elastic member If it is within the deformation range, it can be similarly closed.

Furthermore, during measurement, when placed horizontally as shown in FIG. 3c, it functions as an inclined foot, making the display easier to read.

[Effects of the invention] As explained in detail above, according to the light-shielding cap according to the invention, the cap is movably and rotatably attached to the optical measuring instrument, and the tip of the optical connector is closed by pressing the elastic member. Therefore, it can be used in common with many types of connectors, and can be easily attached and detached without losing it.

Further, during measurement, the light-shielding cap functions as a tilting foot for tilting the optical measuring device, and has the effect of making the display on the display unit easier to see.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a light-shielding cap according to the present invention and an optical measuring device to which this light-shielding cap is attached, and FIG. 2 is a cross-sectional view taken along the line X-X in FIG. 1.
FIG. 3 is a side view showing the operation of this embodiment, and FIG. 4 is a plan view. 1... Optical measuring device, 4... Optical connector, 4a...
Tip portion, 5, 6... Cap, 15... Elastic member, 17... Support shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] The optical connector of the optical measuring device is attached to a light-shielding cap that covers the tip 4a of the optical connector 4 provided in the optical measuring device 1 for measuring the optical signal level of an optical fiber. A support shaft 17 is provided on the side surface of the optical connector, and via the support shaft, the caps 5 and 6 with the elastic member 15 mounted therein can be moved within a predetermined range in the axial direction of the optical connector, and can be moved within a predetermined range when pulled out. A light-shielding cap characterized in that it is provided on the optical measuring device so as to be rotatable in angle, and when the cap is pushed in, the elastic member comes into contact with the tip of the optical connector to seal it.