JPS6349201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing device for a connecting end of an optical transmission fiber cable, which facilitates optical connection of the optical transmission fiber cable.

Various structures have been proposed for connectors that can be easily connected and disconnected without adjustment for optical transmission fiber cables, but the basic idea behind these is to create a mechanical connector that can withstand repeated connection and disconnection at the end of an optical transmission fiber cable. In order to ensure that the material is physically robust and that the optical axes match when connected, it is molded into a plug-like shape that has a cylindrical outer shape with a central axis that precisely matches the optical axis of the optical transmission fiber cable. It is.

As a powerful method for carrying out the above processing,
There is a method of fixing a sleeve-like member to the end of an optical transmission fiber cable, then confirming the position of the optical axis on the end face using a microscope, etc., and processing the outer periphery of the sleeve-like member into a cylinder using this as a reference. This method eliminates various shape and positional errors that occur during the molding process through the final cylindrical processing, so high accuracy can be expected, especially with regard to the concentricity of the optical transmission fiber cable and the cylindrical outer portion.

However, when performing the above-mentioned cylindrical processing, it should be noted that the optical transmission fiber cable cannot be rotated, especially when processing the ends of long optical transmission fiber cables or multi-core optical transmission fiber cables. It is. For this reason, conventionally, to perform this cylindrical machining, a high-precision tool rotation type machine tool such as a jig boring machine is used, but the optical axis position on the end face of the optical transmission fiber cable mentioned above must match the rotation axis of the tool There is a difficulty in centering work.
In other words, in order to align the optical axis and the rotation axis, the end face of the optical transmission fiber cable to be processed is irradiated with light from the other end, and is observed with a centering microscope attached to the processing spindle, and the reference line of the centering microscope and the light are After adjusting the relative position of the processing spindle and the stage to which the end of the optical transmission fiber cable to be processed is attached so that the center of the core image of the transmission fiber cable is aligned, the centering microscope is taken out and the boring head is moved. It is attached to the machining spindle and performs cylindrical machining, but various factors such as positional error in the reference line of the centering microscope, installation error between the machining spindle and centering microscope, and poor workability result in high precision centering. It is very difficult to do this, and there are drawbacks such as the time required for machining due to the work of replacing the boring head of the centering microscope.

The present invention eliminates the above-mentioned drawbacks, and provides an optical cable termination processing device that can perform highly accurate centering with good workability and eliminates the need to replace tools and centering microscopes.

According to the present invention, a detection system for the end face of an optical transmission fiber cable that rotates together with the processing main shaft and includes an optical system and an image sensor, a signal transmission element that guides a signal from the detection system to a fixed point, and a detection system By being equipped with a display device from the above, it is possible to obtain an optical cable terminal processing device that is easy to work with and can perform highly accurate centering.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a configuration diagram showing one embodiment of the present invention.
1 is a fiber cable for optical transmission; 2 is a sleeve-shaped member fixed to the end of the fiber cable 1 for optical transmission; 3 is a chuck for holding the sleeve-shaped member 2;
4 is a machining spindle, 5 is a cutting tool, 6 is a lens constituting a magnifying optical system, 7 is an image sensor, 8 is a slip ring that transmits signals from the rotating body to the fixed body, and 9 is a monitor that displays signals from the image sensor 10 is a feed handle for moving the chuck 3 parallel to the rotation axis of the processing spindle 4; 11 and 12 are feed knobs for moving the chuck 3 in a plane perpendicular to the rotation axis of the processing spindle 4; 13 is not shown; A pulley 14 is a bed for transmitting the rotation of the electric motor to the processing main shaft.

Next, a procedure for machining a cylinder according to this embodiment will be explained.

Light is irradiated from the other end of the processed side end face of the optical transmission fiber cable fixed with chuck 3,
The enlarging optical system 6 forms a bright image of the core portion of the processed side end face of the optical transmission fiber cable 1 on the surface of the imaging device 7 . At this time, the position is adjusted using the handle 10 so that the core image is correctly formed. This core image is detected by the image sensor 7, and an output signal is sent to a monitor device 9 via a slip ring 8, where the core image is displayed.

Next, the core image is observed while rotating the machining spindle 4 at a relatively low speed, and the position of the sleeve member 2 is adjusted using the knobs 11 and 12 so that the core image does not revolve on the monitor device 9.

Thereafter, the machining spindle 4 is rotated at a speed that provides an appropriate cutting speed, and the sleeve member 2 is directed toward the cutting tool 5 using the handle 10 to cut the outer periphery of the feed sleeve 2.

Since the main processing shaft 4, the optical system 6, and the image sensor 7 rotate together, the core image on the monitor device 9 rotates relatively around the rotation axis of the main processing shaft 4, and the revolution of the core image It is clear that if the position of the sleeve member 2 is adjusted so as to eliminate this, the core center and the optical axis position on the end surface of the optical transmission fiber cable 1 to be processed will coincide with the processing center. This will be explained in more detail with reference to FIG.

In Fig. 2, 21 is the rotation axis of the machining spindle 4;
2 and 22' are the optical axes of the magnifying optical system 6.
22 and 22' are at positions rotated by 180 degrees relative to the rotation axis 21. Further, an arrow 23 is an object and corresponds to the core at the end surface of the optical transmission fiber cable 1 on the processed side in the embodiment shown in FIG. Arrows 24 and 24' indicate images of objects corresponding to 22 and 22' by the magnifying optical system 6, and 25 and 2
5' represents the position of the image sensor 7 corresponding to the optical axes 22 and 22', respectively. Although the images 24, 24' and the image pickup elements 25, 25' are substantially on the same plane, they are shown separated from each other in the figure for convenience. As is clear from FIG. 2, if the object 23 is on the rotation axis, the image sensor 25,
The positions of the images 24, 24' on 25' do not change and only rotate. Similarly, when the optical axis coincides with the rotation axis, the position of the image on the image sensor does not change and only rotates when the object is on the rotation axis.

Furthermore, as mentioned above, since the error between the optical axes 22, 22' and the rotation axis 21 does not affect the accuracy of alignment, when configuring the apparatus shown in FIG. It is not necessary to match the rotation axes of 4 with high precision, and there is no need for precise adjustment.
In addition, even slight deviations in the optical axis due to aging, etc. do not affect the centering accuracy, so maintenance of the device is easy.

Note that the image sensor 7 does not necessarily have to be a secondary element, and it is clear that the same effect can be obtained even if it is a primary element.

As described above, according to the present invention, it is possible to obtain an optical cable terminal processing device that can perform highly accurate centering with good workability, can shorten the time required for processing, and does not require precise adjustment in the device configuration.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the centering principle of the present invention, in which 1 is an optical transmission fiber cable, 2 is a sleeve-shaped member, 4
is the processing spindle, 5 is the cutting tool, 6 is the magnifying optical system, 7
8 is an image pickup device, 8 is a slip ring, 9 is a monitor device, 21 is a rotation axis of the processing spindle 4, 22 and 2
2' is the optical axis of the optical system 6, 23 is the object, 24 and 24' are images of the object 23, and 25 and 25' are the positions of the image pickup device 7.

Claims (1)

[Claims] 1. Processing the outer periphery of a sleeve-shaped member coaxially fixed to the end of the optical transmission fiber cable with a processing tool that rotates with the optical axis of the optical transmission fiber cable as the rotation axis. The optical cable terminal processing device includes a light source that illuminates an end surface of the optical transmission fiber cable opposite to the processing side end, and an optical axis substantially coaxial with the rotation axis of the processing tool, and the processing tool an optical system that rotates together with the processing tool and the optical system to enlarge and project the processing side end face of the optical transmission fiber cable; and an optical system that is arranged on the image plane of the optical system and rotates together with the processing tool and the optical system. an image sensor; a slip-ring-shaped signal transmission element that guides an output signal from the rotating image sensor to a fixed point; 1. An optical cable terminal processing device comprising a display device that displays a rotation locus of a brightly formed core image irradiated from an end face of an optical transmission fiber cable.