JPH0560848B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fiberscope for observing inside a cylinder.

[Conventional technology and its problems]

Side viewing fiberscopes have been used to observe the inside of cylinders, and by rotating at least the prism or mirror at the tip of the head around the axis, 360 degrees of the inner surface of the cylinder can be observed.
However, it becomes difficult to impart such rotation when the fiberscope becomes long beyond a certain point, and furthermore, it becomes difficult to connect the eyepiece to other devices and observation is inconvenient.

[Means for solving problems]

In order to solve these problems, the present invention has the following features:
In the cross section of the objective section provided at the tip of the long fiberscope main body, the image guide tip is arranged on a small circle with the same pitch around the circumference, and on a large circle that is concentric with the small circle. The tips of the light guides are arranged at equal pitches around the circumference, and reflective members such as small mirror bodies or prisms are provided at the tips of the image guide and the light guide to change the direction of the optical axis by approximately 90 degrees. , which is configured to simultaneously illuminate and observe the inner surface of a cylinder 360 degrees.

[Effect]

The inner surface of the cylinder can be observed easily and quickly without rotating the fiberscope, and since the tip of the image guide is located closer to the center axis than that of the light guide, one The range of the inner surface of the cylinder where the tip of the image guide can be observed is increased, and the number of image guides can be reduced. Furthermore, when this fiberscope is used for cylinders with various inner diameters, even when used for cylinders with small diameters, the entire 360 degrees of the cylinder can be viewed continuously and simultaneously.

〔Example〕

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIG. 3, 1 is a fiberscope for observing scratches, corrosion, etc. on the inner surface of the cylinder 2;
Reference numeral 3 indicates a grip section (eyepiece section), and an objective section 5 is provided at the tip of the elongated fiberscope main body 4.

Moreover, the objective section 5 has a cylindrical inner surface in the middle for 360 degrees.
It has an optical objective section 5a for simultaneously irradiating and observing.

12 is an image guide made of an optical fiber, and as is clear from FIGS. 1 and 2, the image guide tips 12a are arranged on a small circle S at equal pitches with a center angle of 45 degrees. Set up That is, 12
b is an objective lens system, and 12c is a reflecting member made of a prism that is installed at the tip of the image guide 12 and changes the direction of the optical axis by approximately 90 degrees. Arrange cylinders etc. on top in a pitched manner.

On the other hand, 13... is a light guide made of an optical fiber that transmits light from the grip part 3 side,
As is clear from the schematic diagrams in Figures 1 and 2, the central angle
The light guide tips 13a are arranged on the great circle L at an even pitch of 45 degrees. That is, a reflecting member 13c such as a small mirror body (or prism) provided at an angle with respect to the axis (this reflecting member 13c is provided at the tip of the light guide 13 and changes the direction of the optical axis by approximately 90 degrees). ...and the light guide end surfaces are respectively arranged on the great circle L at a cylindrical pitch. This large circle L is concentric with the small circle S.

As is clear from FIG. 1, the image guide side end 12a and the light guide tip 13a
A small cylindrical body 14 is provided along the axis of the head end cylindrical part 8 that covers the head, and along the outer periphery of this small cylindrical body 14,
The tips 12a of the image guide 12 are arranged in a star shape. Although it is possible to pass an electric wire cable for a detector etc. through the axial center hole 20 of this small cylinder body 14,
In the figure, a blind cap 21 is attached to the tip.

In addition, by shifting the position of the light guide tip 13a on the outside side of the image guide tip 12a on the inside side in the cross section toward the grip section 3 (by moving it backward), as shown in FIG. , the inner surface 2a of the cylinder 2 can be observed or irradiated. Note that 15 is a short cylindrical window wall made of a transparent material.

Then, as shown in FIG. 2, the opening angle θ of the light in the cross section is determined so that the inner surface 2a of the cylinder 2 can be viewed 360 degrees at the same time. In other words, in Fig. 2, adjacent reflecting members (prisms) 12
Set the opening angle θ (with respect to the smallest inner diameter of the cylinder 2 used) so that the visible range M of c, 12c partially wraps (or so that the boundaries coincide).
Set.

In addition, image guide 12... and light guide 1
Of course, the number of 3... can be freely increased or decreased, but it is necessary to be able to view the entire 360 degrees of the cylindrical inner surface 2a at the same time.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following remarkable effects.

The image guide tips 12a are arranged on a small circle S inside the light guide tips 13a and placed as close to the axis as possible, so that the range in which one tip 12a can be observed (the second The range M) in the figure becomes wider, and the required number of image guides 12 can be reduced.

Furthermore, when the same number of image guides 12 are arranged, the inner diameter of the cylinder 2 that allows simultaneous 360-degree observation becomes smaller. In other words, it can also be used for cylinders 2 with small inner diameters.

Unlike conventional fiberscopes, there is no need to rotate the entire fiberscope or the distal end of the fiberscope, and by simply moving the fiberscope in the axial direction of the cylinder 2, the entire 360 degrees can be observed simultaneously, significantly improving the efficiency of observation work.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line 1 in FIG. 1, and FIG. 3 is a substantially overall side view. S...Small circle, L...Large circle, 4...Fiberscope body, 5...Objective part, 12...Image guide, 12a
...Image guide tip, 13...Light guide,
13a...Light guide tip.

Claims (1)

[Claims] 1. In the cross section of the objective section provided at the tip of a long fiberscope body, the image guide tip is arranged on a small circle with the same pitch around the circumference, and a large circle concentric with the small circle. The tips of the light guides are arranged at the same circumferential pitch on the top, and reflective members such as small mirrors and prisms are provided at the tips of the image guide and the light guide to change the direction of the optical axis by about 90 degrees. A fiberscope for observing inside a cylinder, characterized in that it is configured to simultaneously illuminate and observe the inner surface of a cylinder 360 degrees.