JPH059686Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a terminal device mounting structure with an optical fiber focusing mechanism.

[Conventional technology]

In recent years, optical fibers have been used in various fields, not only for optical communications, but also as light sources for sensors and other means for transmitting detection signals. Many terminal devices are used that can adjust the distance between the lens and the tip of the optical fiber, such as by focusing or converging the light emitted from the optical fiber. As a conventional device of this type, the one proposed in Utility Model Application Publication No. 14942/1983 is known, for example. In the terminal device of Utility Model Application No. 57-14942, the end metal fitting to which the optical fiber is fixed is screwed into an attachment case with a lens, and then the set screw is screwed into the attachment case. The end fitting is pressed against the attachment case with the tip of the screw, thereby fixing the end fitting to the attachment case.

[The problem that the idea aims to solve]

However, in the above-mentioned conventional terminal device, the end fitting is fixed to the attachment case after adjustment by pressing the setting screw against the end fitting. The problem is that it often gets crushed under pressure and becomes unusable, and when this happens, the end fitting cannot be turned with respect to the attachment case and readjustment becomes impossible. This is not a desirable situation.

In view of the above circumstances, the present invention has been developed to allow easy and highly accurate positioning of the end face of the optical fiber with respect to the lens, and to fix the binding collar and lens barrel simply by tightening a nut ring. To provide a simple optical fiber terminal device mounting structure with a focus adjustment mechanism that can be easily adjusted and readjusted many times without damaging the member due to pressure due to this fastening. The purpose is to provide.

[Means and effects for solving the problem] The present invention was made to achieve the above object, and when the binding collar to which the end of the optical fiber is fixed is screwed into the lens barrel, the binding collar is fixed. The end position of the optical fiber with respect to the optical lens is adjusted, and in order to fix this position, the nut ring is screwed onto the male thread of the binding collar to fasten the lens barrel and the binding collar. .

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical fiber terminal device mounting structure with a focus adjustment mechanism according to the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a flexible exterior tube, 2 is a mounting portion on the light source side of the flexible exterior tube 1, that is, a mounting portion that is screwed onto an input device, and 3 is a drawer portion of the flexible exterior tube 1. An appropriate number of optical fibers are bundled from the pull-out portion 3 of the flexible exterior tube 1, and protective tubes 4a to 4i are attached to each of them.
and each has a focus adjustment mechanism 5a at its tip.
~5i is attached. Focus adjustment mechanism 5a-5
i is designed to be detachably attached within the light receiving device.

The focus adjustment mechanisms 5a to 5i are the same mechanism, and one focus adjustment mechanism 5 will be explained below based on FIG. 2. The focus adjustment mechanism 5 is
It has a binding collar 6, and a binding hole 7 is bored in the center of the binding collar 6. The output ends of a plurality of optical fibers 8 are inserted into the binding hole 7 and fixed so as not to come out. The optical fiber 8 is
Insert until the output end reaches the opening of the binding hole 7. The end of the protective tube 4 surrounding the optical fiber 8 is fixed to the rear end of the binding collar 6. A male screw 9 is formed on the circumferential surface of the binding collar 6. A female thread 11 formed on the inner surface of the lens barrel 10 is screwed into the male thread 9 of the binding collar 6. The lens barrel 10 is formed into a cylindrical shape, and a light condensing lens 12 is fixedly installed inside one side. Further, a nut ring 13 as a fixing member is screwed into the male screw 9 of the binding collar 6.

The focus adjustment mechanism 5 having the above configuration is fixed to a light receiving device (not shown), but various fixing methods can be applied.For example, the focus adjustment mechanism 5 is inserted into the receiving cylinder, and the tip of a screw is inserted into the receiving cylinder. It can be attached using a simple mechanism that presses it against the body and fixes it.

To readjust the focus, first remove the focus adjustment mechanism 5 from the light receiving device, etc., and then let light enter the optical fiber 8 from the light source and transmit it to the output end. As the light source, it is convenient to use the light source of the light to be actually transmitted, as well as the peach for testing. Then, the light inside the optical fiber 8 is transferred to the lens 1.
2 to the outside. A projection plate 14 made of white paper or the like is placed at a predetermined distance in front of the lens 12, and the lens 12 is placed on the projection plate 14.
Projects synchrotron radiation from. Next, nut ring 13
After loosening and releasing the fixation of the lens barrel 10, turn the lens barrel 10 and move the lens barrel 10 in the forward and backward direction with respect to the binding collar 6, and then attach the projection plate 14.
The upper projection light is focused or adjusted so that the diameter of the projection light is minimized. After adjustment, in order to fix the position of the lens barrel 10 with respect to the binding collar 6, turn the nut ring 13 to press the nut ring 13 against the end surface of the lens barrel 10, thereby fixing the lens barrel 10 to the binding collar 6. .
The distance at which the projection plate 14 is placed opposite the lens 12 when adjusting the focus is the distance between the lens 12 and the light receiver in the light receiver when the focus adjustment mechanism 5 is installed in the light receiver, etc. , can be set arbitrarily. Furthermore, when adjusting the focus by moving the lens barrel 10 with respect to the binding collar 6, it is also possible to use a machine or device that measures the position of the focus. After adjusting the focus, it is of course possible to attach it to a light receiving device or the like.

The above focus adjustment is performed by individually adjusting each of the focus adjustment mechanisms 5a to 5i shown in FIG. Do it like this.

[Effect of idea]

As described above, according to the present invention, after adjusting the end face position of the optical fiber with respect to the condensing lens, fixing the binding collar to the lens barrel can be done by simply screwing the nut ring onto the binding collar. At this time, the center of the binding collar can be fixed without shifting from the center of the lens barrel, that is, the center of the condensing lens, and the center of the binding collar can be fixed without shifting from the center of the condensing lens. It is particularly convenient because it can be fixed without any need to adjust the position, and it can be easily adjusted when the position needs to be adjusted each time depending on the purpose of use.

[Brief explanation of the drawing]

The drawings show one embodiment of the optical fiber terminal device mounting structure with a focus adjustment mechanism according to the present invention, and
The figure is a perspective view showing an optical fiber cable equipped with a focus adjustment mechanism, and FIG. 2 is an enlarged sectional view of the focus adjustment mechanism. 1...Flexible exterior tube, 4, 4a~
4i...Protection tube, 5,5a-5i...Focus adjustment mechanism, 6...Bundling collar, 7...Binding hole, 8
...Optical fiber, 9...Male thread, 10...Lens tube, 11...Female thread, 12...Lens, 13...
...Nuttling, 14...Projection board.

Claims (1)

[Scope of utility model registration request] A binding collar with a binding hole drilled in the center and a male thread formed on the outer periphery, and a lens with a condensing lens fixed on one end of the interior and a female thread formed on the inner peripheral surface of the other end. The ends of a plurality of optical fibers are fitted into the binding hole of the binding collar and fixed therein, and the binding collar is screwed into the lens barrel so that its position can be adjusted with respect to the condensing lens. A focus of an optical fiber, characterized in that a nut ring is screwed onto a male threaded portion of the binding collar protruding outward from the inside of the lens barrel to connect the binding collar and the lens barrel. Terminal mounting structure with adjustment mechanism.