JPH0527705U - Optical fiber fusion splicer - Google Patents

Abstract

(57) [Abstract] [Purpose] The microscope used to directly view the core of the conventional fusion splicer for optical fibers is designed to fit 125 μm diameter optical fibers.
The magnification of the objective lens 20 and the length of the lens barrel 30 are determined.
However, with conventional equipment, it has become popular recently
When observing an optical fiber with a diameter of 80 μm, the fiber image obtained is smaller than that of 125 μm. Therefore, 125
The resolution is worse than in the case of μm, the alignment accuracy is lowered, and the connection characteristics such as the connection loss are likely to be deteriorated. To solve this problem. [Structure] The magnification of the objective lens 20 and the length of the lens barrel 30 can be changed. By doing so, it is possible to obtain a fiber image of the same size by adjusting the magnification and the lens barrel length according to the fiber diameter.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical fiber fusion splicing device of a direct-view type, and particularly to a portion for observing an optical fiber.

[0002]

[Prior Art]

 FIG. 2 schematically shows only the part of the conventional fusion splicer which is directly related to the core. Reference numeral 10 is an optical fiber, 20 is an objective lens, 30 is a lens barrel, and 40 is a TV camera (CCD camera). The linear light 12 transmitted through the optical fiber 10 is magnified by the objective lens 20, and a fiber image 50 (FIG. 3) is obtained by the TV camera 40. In this case, the magnification of the objective lens 20 and the length of the lens barrel 30 are preset so that the focused fiber image 50 can be captured.

Conventionally, since an optical fiber having a fiber diameter of 125 μm is often used, both the magnification of the objective lens 20 and the length of the lens barrel 30 are determined according to the optical fiber having a fiber diameter of 125 μm.

[0004]

[Problems to be solved by the device]

 When an optical fiber having a fiber diameter of 80 μm is similarly observed with such an apparatus, the fiber image 60 at that time (FIG. 4) becomes smaller than the fiber image 50 having a fiber diameter of 125 μm. Therefore, the resolution of the 80 μm fiber image 60 is worse than that of the 125 μm fiber image 60, and the alignment accuracy may be deteriorated. As a result, the connection characteristics such as the connection loss of the 80 μm optical fiber are likely to be inferior to those of 125 μm.

Recently, an optical fiber having a fiber diameter of 80 μm has come to be often used, but it is difficult for the conventional device to obtain the same alignment accuracy with both optical fibers.

[0006]

[Means for Solving the Problems]

 As shown in FIG. 1, the magnification of the objective lens 20 and the length of the lens barrel 30 can be changed.

To change the magnification of the objective lens 20 is specifically to make the magnification larger in the case of the 80 μm optical fiber than in the case of the 125 μm optical fiber. To increase the magnification of the objective lens 20, as shown in FIG. 1, a lens 22 having a large magnification is exchanged, another lens is combined with the objective lens 20 to increase the magnification, and a zoom lens is used. Take the way.

Since the focal length changes when the magnification of the objective lens 20 changes, the length of the lens barrel 30 needs to be changed. For that purpose, a part 32 of the lens barrel 30 is made to be a slide fit type, and the fiber diameter The length of the lens barrel is adjusted by driving the motor according to.

[0009]

[Action]

 By setting the magnification of the objective lens 20 and the length of the lens barrel 30 depending on whether the fiber diameter is 125 μm or 80 μm, it is possible to obtain fiber images of the same size.

[0010]

[Effect of the device]

 (1) Since the size of the observed fiber image does not depend on the fiber diameter, changing the fiber diameter does not affect the alignment accuracy. (2) Even if the fiber diameter is 80 μm, the same connection characteristics as in the case of 125 μm optical fiber can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view schematically showing only a main part of the present invention.

FIG. 2 is an explanatory diagram of a conventional technique.

FIG. 3 is an explanatory diagram of a fiber image of a 125 μm diameter optical fiber.

FIG. 4 is an explanatory view of a fiber image of an 80 μm diameter optical fiber obtained by a conventional device.

[Explanation of symbols]

 10 Optical Fiber 12 Linear Light 20 Objective Lens 22 Lens with Different Magnification 30 Lens Barrel 32 Slide Fitting Part 40 TV Camera 50, 60 Fiber Image

Claims (1)

[Scope of utility model registration request] 1. An optical fiber fusion splicing apparatus comprising an objective lens, a lens barrel, and a TV camera for observing an optical fiber by a core direct-viewing method, wherein the magnification of the objective lens and the length of the lens barrel are changed. An optical fiber fusion splicing device capable of performing the above.