JPH0784190A - Optical fiber observation microscope - Google Patents

Abstract

(57) [Summary] [Objective] To provide a microscope for observing an optical fiber, which has no moving parts, reduces the number of parts, and improves reliability. [Structure] Three objective lenses having different magnifications are arranged in a single lens barrel in three directions having a focal point at the same point, and switching of the respective objective lenses to the field of view is performed by an illumination lamp paired with the objective lens. A microscope for observing optical fibers that is turned on and off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microscope for observing optical fibers in fusion splicing of optical fibers.

[0002]

2. Description of the Related Art In fusion splicing of optical fibers, it is necessary to observe the position of the optical fiber glass from at least two orthogonal directions. In principle, as shown in FIG. 2, observation is performed using two microscopes 11 and 12 each having one objective lens in two directions orthogonal to the optical fiber A.

However, as a conventional optical fiber observing means, as shown in FIG. 3, a movable microscope 21 and a movable mirror 23 are used in place of the microscope 12, and a real image of the optical fiber A by the microscope 21 and a moving image are moved. The image A'of the mirror 23 was observed from the same direction with the microscope 21 '. 22 is an illumination lamp.

[0004]

In the conventional observation of the above-mentioned optical fiber, since the optical system is composed of the three elements of the illumination lamp, the mirror, and the microscope, the number of parts is large, and the positioning of the mirror and the movement of the microscope. Had to be adjusted. Further, since there is only one objective lens, it is possible to observe only at a constant magnification, it is difficult to confirm the position at low magnification, and there is a problem that operability is poor because the field of view is narrow at high magnification.

[0005]

SUMMARY OF THE INVENTION The present invention provides a microscope for observing an optical fiber, which solves the above-mentioned problems, has no moving parts, reduces the number of parts, and improves reliability. The feature is that three objective lenses with different magnifications are arranged in three directions with a focal point at the same point on a single lens barrel, and switching to the field of view of each objective lens is performed by an illumination lamp paired with the objective lens. There is a combination of lighting and extinguishing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a concrete example of a microscope for observing an optical fiber according to the present invention. As shown in the drawing, three objective lenses 2, 3 and 4 are arranged in a single microscope lens barrel 1 in three directions having a focal point at the same point. The objective lenses 2 and 3 are high-magnification objective lenses positioned on orthogonal optical axes. The objective lens 2 is for observation in the X direction and the objective lens 3 is for observation in the Y direction. It is possible to observe the direction. A low-magnification objective lens 4 is arranged between these two objective lenses 2 and 3, and has a wide field of view and good operability. 5, 6 and 7 are illumination lamps, and the illumination lamp 5 includes the X-direction high-magnification objective lens 2 and the illumination lamp 6
Is paired with the Y-direction high-magnification objective lens 3, and the illumination lamp 7 is paired with the low-magnification objective lens 4.

[0007]

When the optical fiber A is observed, the illumination lamp 7
Is turned on, and the low-magnification objective lens 4 is operated and observed to move the optical fiber A near a predetermined observation position. Next, the illumination lamp 7 is turned off, the illumination lamps 5 and 6 are turned on, and the optical fiber A is simultaneously observed from two directions by the high-magnification objective lenses 2 and 3. In this case, first, only the illumination lamp 5 is turned on, and after observing with the objective lens 2, the illumination lamps 5 and 6 are
Alternatively, the objective lens 3 may be used to individually observe from two directions.

[0008]

As described above, the optical fiber observing microscope of the present invention has the following advantages. (1) Since the optical fiber can be observed from two directions with the two high-magnification objective lenses arranged on the orthogonal optical axes, no mirror is required, and the two objective lenses have a focal point at the same point. , You can observe with the microscope fixed, and no moving parts are required. (2) Since the low-magnification objective lens is arranged in the middle of the high-magnification objective lens, the optical fiber can be positioned in a wide field of view, and the operability is improved. (3) Since switching between the low-magnification objective lens and the high-magnification objective lens is performed by switching the illumination lamp without using mechanical means, there are no space restrictions and there are no moving parts, so the number of parts is reduced and reliability is reduced. Improves sex. Therefore, in view of the usage of precision machinery such as optical fiber fusion splicer brought to the construction site, it is possible to realize lighter weight and smaller size, which is extremely effective for improving reliability and improving construction efficiency. is there.

[Brief description of drawings]

FIG. 1 is an explanatory view of a specific example of a microscope for observing an optical fiber according to the present invention.

FIG. 2 is a diagram illustrating the principle of two-way observation of an optical fiber.

FIG. 3 is an explanatory diagram of a conventional two-way observation method of an optical fiber.

[Explanation of symbols]

 1 Microscope barrel 2, 3 High magnification objective lens 4 Low magnification objective lens 5 X direction illumination lamp 6 Y direction illumination lamp 7 Low magnification illumination lamp A Optical fiber

Claims (1)

[Claims] 1. A single lens barrel is provided with three objective lenses having different magnifications arranged in three directions having a focal point at the same point, and the switching of the respective objective lenses to the field of view is paired with the objective lens. An optical fiber observing microscope characterized by performing a combination of turning on and off a lamp.