JPH03125109A - Fiberscope - Google Patents

Abstract

PURPOSE:To observe a narrow part as a distinct image by setting the visual field direction of an image guide and the irradiation direction of a light guide so that they are matched and making the most leading edge part of the light guide closer to a base part than a window part for side viewing. CONSTITUTION:The fiberscope is provided with an image guide 2 by which side viewing can be performed through the window part 14 for side viewing on its leading edge and the light guide 3 which is in parallel with the observation side of the image guide 2 and successively provided so that the visual direction of the image guide 2 is matched with its irradiation direction. Then, the extreme leading edge part 24 of the light guide 3 is set closer to the base part than the window part 14 of the image guide 2. Therefore, illuminating light from the light guide 3 is allowed to irradiate only from a position closer to the base part than the window part 14 and the reflected light of the illuminating light from a part closer to the leading edge part than the window part 14 is not made incident on the image guide. Since the excess reflected light does not exist, the image in an observation part is made clearer and a corner part which could not be observed in a conventional manner since the leading edge of the light guide 3 abuts on it, can be observed.

Description

[Detailed description of the invention] [Industrial application field] FIELD OF THE INVENTION The present invention relates to a fiberscope.

[Prior art and problems to be solved by the invention] As shown in Figs. 8 and 9, a fiberscope with a tip probe inserted into a dark narrow space to observe the inside of the narrow space has a tip probe as shown in Figs. A sheet-like material is used.

That is, there is an image guide a that allows side viewing through the side viewing window C at the tip, and 18 points regarding the image guide a.
Light guides b, b arranged in parallel at 0° symmetrical positions
It was equipped with the following.

Therefore, since the illumination light is emitted across the side viewing window C, the reflected light from the illumination light emitted from a position closer to the tip than the window C enters the image guide a, improving image quality. I was making it worse. d is a mirror or prism, etc., which allows the light entering through the window C to enter the image guide; e is a mirror, prism, etc., which allows the light to enter the image guide from the light guide B through the hole g. illumination light is irradiated onto the observation site.

Accordingly, an object of the present invention is to provide a fiberscope that can be inserted into a dark narrow space and that can observe the inside of the narrow space as a clear image.

[Means to solve the problem]

In order to achieve the above-mentioned object, the fiberscope of the present invention includes: an image guide that allows side viewing through a side viewing window at the tip; arranged in parallel on the observation side of the image guide; a light guide that is arranged in series so that the viewing direction of the image guide and the irradiation direction thereof are aligned, and the leading end of the light guide is provided closer to the base than the side viewing window of the image guide. It is being

[Effect]

The illumination light from the light guide is emitted only from a position closer to the base than the side viewing window, and no illumination light is emitted from a position closer to the tip than the side viewing window. The reflected light of the illumination light from closer to the tip than the window does not enter the image guide.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

FIG. 3 shows a fiberscope according to the present invention, which includes two image guides 2.2 (see FIGS. 1 and 2) and four image guides 2.2 (see FIGS. 1 and 2) inside a flexible narrow tube 1. A light guide 3 (see FIGS. 1 and 2) is inserted into the fiber main body 4, and the main body 4
At the base end of the eyepiece 5, only the image guide 2.2 is connected to the eyepiece 6 housed in the eyepiece 5, and only the light guide 3... is inserted through the eyepiece 5. A branch pipe 7 is connected. Furthermore, an insertion guide tube 9 is connected to the branch tube 7 and is inserted into and fixed to a light source device (not shown). The narrow tube 1 is made up of, for example, a flexible metal spiral tube and a coating layer made of rubber, plastic, etc. that covers the spiral tube. The arrangement of the light guides 3 and 3 is free.

As shown in FIG. 4, the image guide 2 includes a main body 10 consisting of a glass portion including a core and a clad and a large number of pixels, a coating layer covering the glass portion, and a tip of the main body 10. an outer cylindrical body 11 that covers the outer cylindrical body 1;
Objective lens 12 and prism 1 contained in the tip of 1
3 (a mirror may be used instead of the prism I3), and a side viewing window 14 is provided in the prism-corresponding portion of the peripheral wall of the outer cylinder 11. Therefore, this image guide 2 allows side viewing through the side viewing window 14.

The light guide 3 includes a main body 15 having a plurality of fiber core wires, an outer cylinder 16 covering the tip of the main body 15, and an inner tube at the tip of the outer cylinder 16, as shown in FIG. A prism 17 (a mirror may be used instead of the prism 17) is provided, and a light irradiation window 18 is provided in the prism-corresponding portion of the peripheral wall of the outer cylinder 16. Therefore, this light guide 3 illuminates the side. Note that the fiber core wire consists of a core, a cladding, and a covering layer.

Further, in FIGS. 4 and 5, S represents an adhesive.

Therefore, the base end portion of each outer cylinder body 11, 16...
As shown in the figure, it is connected to a box 19, and the tip of the small diameter tube 1 is connected to the box 19.

That is, the main body 10 of the image guide 2 and the main body 15 of the light guide 3 penetrate the box 19. Note that the tip end side of the box 19 is the tip probe 20 .

Therefore, in the tip probe 20, FIGS.
As shown in the figure, the image guides 2.2 and light guides 3... are arranged in parallel and are shaped like sheets.

Specifically, the side view direction of each image guide 2°2 is approximately 1
80'' opposite directions, and two light guides 3.3 are arranged in parallel on the observation side of each image guide 2.2. 2) is set to match the irradiation direction of the light guide 3.The leading edge 21 of the light guide 3 is located closer to the base than the side viewing window 14, and the outermost The leading edge 21 of the light guide 3 at the position
is located closer to the base than the window portion 18 of the adjacent light guide 3. In other words, the distal end surface 24 of the ridge guide 3 does not protrude beyond the window portion 14 of the image guide 2 toward the distal end.

In addition, between the image guides 2 and 2, dummy pipes 22 and 22 are installed for reinforcement and to prevent damage to the image guides 2.
is mediated. The tip surface 22 of this dummy pipe 22
a protrudes from the distal end surface 23 of the image guide 2 toward the distal end side.

Note that the dummy pipe 22 and the outer cylinder body 11.16 are each made of, for example, a stainless steel pipe. Furthermore, as shown in FIG.
5, a slight angle α (specifically, for example, 8°
~10°).

Next, FIG. 6 shows the state in which the fiberscope constructed as described above is used, and the tip probe 20 is inserted between the fuel assemblies 26 to observe the springs, dimples, etc. That is, in this case, two image guides 2, 2 are arranged one above the other, allowing for upward and downward viewing. Furthermore, since the tip end surface 22a of the dummy pipe 22.22 is at the most extreme point during insertion, the image guide 2.2 and the light guide 3.3 are effectively protected.

Furthermore, since the direction of the side view center line 27 of each image guide 2.2 forms a slight angle α with respect to the plane 25, when inserted between the aggregates 26, 26, each of the aggregates 26... This makes it easier to observe the outer circumferential surface.

During observation, the illumination light from the light guide 3 is irradiated from a position closer to the base than the side viewing window 14 of the image guide 2, so the illumination light illuminates the strap or the plate thickness. There is no illumination, and the reflected light does not enter the image guide 2 as in the conventional case. Therefore, the observation section can be observed with a clearer image.

Next, FIG. 7 shows the main part of another embodiment, and FIG.
, one image guide 2 and one light guide 3 are used, FIG. 7 (II) shows one image guide 2 and two light guides 3, and FIG. 7 (III) shows one image guide 2 and two light guides 3. 2 and 2 light guides 3 each,
In FIG. 7(IV), there are two image guides 2 and four light guides 3. In addition, Fig. 7 (1) (I
In f), the dummy pipe 22 can be freely installed on the side opposite to the light guide 3 as shown by the imaginary line, and the seventh
In Figure (III), a dummy pipe 22 may be interposed between the image guides 2, 2.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

The light entering the image guide 2 has no extra reflected light, and the image in the observation section becomes clearer. Since the light guide 3 does not protrude further toward the distal end, it is possible to observe corners that could not be observed because the distal end of the light guide 3 hitherto hits.

[Brief explanation of the drawing]

Fig. 1 is an enlarged plan view of main parts showing one embodiment of the present invention;
The figure is an enlarged side view, Fig. 3 is an overall front view, Fig. 4 is an enlarged sectional view of the main part of the image guide, Fig. 5 is an enlarged sectional view of the main part of the light guide, and Fig. 6 is a simplified perspective view of the main part of the light guide. Figure, 7th
The figure is an enlarged plan view of main parts of another embodiment. FIG. 8 is an enlarged plan view of the main part of the conventional example, and FIG. 9 is an enlarged side view. 2... Image guide, 3... Light guide, 14
... Window section for side view, 21... Tip end section.

Claims (1)

[Scope of Claims] 1. An image guide that allows side viewing through a side viewing window at the tip; and an image guide that is arranged in parallel on the viewing side of the image guide, and that a light guide arranged in series so as to match the irradiation direction; and a leading end of the light guide is provided closer to the base than the side viewing window of the image guide. fiber scope.