JPH0114914Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an inner wall inspection device for a hollow body, which is used, for example, to inspect whether or not there are flaws on the inner wall surface of a bottomed cylinder.

"Prior Art" As an example of a conventional inspection apparatus of this type, one configured as shown in FIG. 2 is known. In other words, this hollow body inner wall surface inspection device is
An eyepiece 2 and a prism 3 are provided at the base end of the cylinder 1.
However, a prism 4 is provided at each tip, and a plurality of lenses such as a condensing lens and an erecting lens are each provided within the cylinder 1. When inspecting the inner wall surface of a bottomed cylinder (hollow body) using this hollow body inner wall surface inspection device, for example, the prism 4 portion at the tip of the cylinder body 1 is first inspected. The object was inserted into a bottomed cylinder, and the inner wall surface of the bottomed cylinder was viewed through the eyepiece 2 by rotating the bottomed cylinder or by rotating the cylindrical body 1.

``Problem to be solved by the invention'' However, with such an inspection device, it is not possible to see the entire inner wall surface of the bottomed cylinder at once, but only locally, so it is difficult to see the flaws. There is a risk of dropping the cylinder, and even if a scratch is found, it is difficult to determine where the scratch is located inside the bottomed cylinder, making inspection time-consuming.

The present invention solves the above-mentioned problems of conventional hollow body inner wall surface inspection equipment, and enables the inspection of the entire inner wall surface of a hollow body at once, allowing it to detect any flaws on the inner wall surface of the hollow body. To provide an apparatus for inspecting the inner wall surface of a hollow body, which can reliably inspect the presence of flaws in a short period of time, and can easily identify the location of flaws.

"Means for Solving the Problems" The present invention has the following configuration to achieve the above object. That is, an eyepiece lens is provided on the base end side of the cylinder body, a fisheye lens inserted into the hollow body is provided on the distal end side, a plurality of lenses are provided inside the cylinder body, and a plurality of lenses are provided inside the peripheral wall of the cylinder body. , a plurality of optical fibers extending along the axis of the cylindrical body are buried in the circumferential direction, a light source is connected to the base end of the optical fiber, and the tip part is connected to the peripheral part of the fisheye lens to direct the light from the light source to the hollow body. The fisheye lens has a configuration in which it is opened in a widening shape so that irradiation can be irradiated along the inner wall surface of the fisheye lens, and a shielding member is provided at a predetermined position on the optical axis of the fisheye lens.

``Operation'' When inspecting whether there are any scratches on the inner wall surface of a hollow body, first insert the fisheye lens at the tip of the cylindrical body into the hollow body, and then inspect the entire inner wall surface of the hollow body through the eyepiece. See it all at once. In this case, the optical fiber guides the light from the light source to the tip of the optical fiber without scattering it outside the optical fiber. Therefore, the entire inner wall surface of a hollow body can be seen at once through a fisheye lens, multiple lenses, and an eyepiece, and therefore it is possible to inspect the entire inner wall surface of a hollow body at one time to see if there are any flaws. It is also possible to easily grasp the location of this flaw.

Also, at this time, the illumination light from the light source is irradiated obliquely from the periphery of the fisheye lens to the inner wall surface of the hollow body along the inner wall surface of the hollow body, and passes through the eyepiece lens into the interior of the hollow body without causing harmful halation. To make a wall surface clearly visible and easily discover flaws on the inner wall surface due to shadows caused by illumination light.

In addition, by the shielding effect of the shielding member, even if the hollow body has a bottom, the image of unnecessary parts is shielded or the brightness is appropriately reduced, and the brightness of the image in the visual field is made almost uniform. do. If it is not necessary to inspect the bottom of the hollow body for scratches, the center of the image in the field of view can be made darker than the other parts to make the inner peripheral wall surface of the hollow body stand out. Improves inspection work efficiency without making it difficult to see.

"Embodiment" An embodiment of this invention will be described below with reference to FIG.

In the figure, numeral 11 is a cylinder, and an eyepiece 12 is attached to the base end of the cylinder 11.
A fisheye lens 13 is attached to the tip of 1,
Furthermore, inside the cylinder 11, there are a plurality of lenses 14, 14...
... are attached to each. These plural lenses 14, 14, . . .
Although it is shown as being provided only on the distal end side of the lens 14, it is also provided on the proximal end side of the cylinder body 11 like these lenses 14, 14, and these are omitted from illustration. ing. Note that the optical axes of each of the lenses are made to coincide. An outer cylinder 15 is fitted into the cylinder 11. Inside the peripheral wall of the outer cylinder 15, a plurality of optical fibers 16, 16, .
The tip end of the outer tube 15 is opened in a widening shape so that light from a light source 17, which will be described later, can be irradiated from the periphery of the fisheye lens along the inner circumferential wall surface 23 of the bottomed cylinder (hollow body) 18. has been
Further, the base ends of these optical fibers 16, 16, . . . are connected to a light source 17 provided outside the outer cylinder 15.

In addition, the fisheye lens 13, the lenses 14, 14...
..., a shielding member (disc) 21 is provided at or near at least one image point 20 on the optical axis 19 of the eyepiece 12. These shielding members 21 are configured to shield the bottom portion 22 of the image visible through the eyepiece 12 or to appropriately reduce the brightness of the central portion.

For example, the bottomed cylinder (hollow body) 18
When inspecting whether there are any scratches on the inner wall surface of
First, the fisheye lens 13 at the tip of the cylindrical body 11 is inserted into the bottomed cylinder 18, and the entire inner wall surface of the bottomed cylinder 18 is viewed at once through the eyepiece 12. In this case, the optical fiber 16 guides the light from the light source 17 to the tip of the optical fiber 16 without scattering it outside the optical fiber 16, and since the fisheye lens 13 is a lens that can normally obtain a field of view of around 180 degrees, This fisheye lens 13 and lens 14,
14..., the entire inner wall surface of the bottomed cylinder 18 can be seen at once through the eyepiece 12, and therefore the bottomed cylinder 18 can be viewed through the eyepiece 12.
It is possible to inspect at once whether or not there are any scratches on the entire inner wall surface of the machine, and the location of the scratches can also be easily determined.

Also, at this time, the illumination light from the light source 17 is transmitted through the fisheye lens 1.
3, the inner wall surface of the bottomed cylinder 18 is illuminated obliquely along the inner wall surface of the bottomed cylinder 18, so that the inner wall surface of the bottomed cylinder 18 can be clearly seen through the eyepiece lens 12 without causing harmful halation. Scratches on the inner wall surface are easily discovered because of the shadows created by the illumination light that is applied along the inner wall surface. In addition, by making the irradiation direction of this illumination light somewhat spiral, the optical axis 1
It is also possible to create shadows for scratches on the inner wall surface parallel to 9, making it easier to find scratches on the inner wall surface.

Further, since the shielding member 21 is provided in this embodiment, the bottom part 22 of the image visible through the eyepiece 12 is protected by the shielding action of the shielding member 21.
It is possible to make the brightness of the image in the field of view almost uniform by shielding that part or reducing the brightness of the central part as appropriate. Therefore, in this example,
There is no case where the amount of reflected light from the bottom 22 of the bottomed cylinder 18 is large and the center of the visual field is too bright and dazzling compared to the outer periphery, making it difficult to see the inner peripheral wall surface 23 of the bottomed cylinder 18. In addition, the bottomed cylinder 1
If it is not necessary to inspect whether there are any scratches on the bottom 22 of the bottom cylinder 18, the shielding effect of the shielding member 21 makes the center of the image darker than the other parts.
The inner peripheral wall surface 23 can also be raised to make it easier to see.

In addition, in the embodiment, the eyepiece lens 12
Although the description has been made regarding the case where the camera is viewed with the eyes through the camera, the structure is not limited to this, and the configuration may be such that, for example, a camera can be attached to this part and a photograph can be taken.

"Effects of the invention" According to this invention, (a) A plurality of optical fibers extending along the axis of the cylinder are embedded in the circumferential direction inside the peripheral wall of the cylinder, and a light source is connected to the base end of the optical fiber. Therefore, the light can be guided to the tip of the optical fiber without being scattered.In other words, since the optical fiber is used, the light can be guided only to the part to be illuminated. Since the structure is equipped with a fisheye lens, the entire inner wall surface of the hollow body can be seen at once, and therefore it is possible to reliably inspect whether there are any scratches on the inner wall surface of the hollow body in a short time. , the location of the scratch can be easily grasped, and iii) the tip of the optical fiber is opened in a widening shape so that the light from the light source can be irradiated from the periphery of the fisheye lens along the inner wall surface of the hollow body. Therefore, the illumination light from the light source is irradiated obliquely to the inner wall surface of the hollow body and follows this inner wall surface, so the shadows of scratches on the inner wall surface caused by this light can be clearly seen through the eyepiece without causing harmful halation. In addition, since a shielding member is provided at a predetermined position of the optical axis of the fisheye lens, even if the hollow body has a bottom, scratches on the inner wall surface can be detected very easily. By blocking the image of unnecessary parts or reducing its brightness appropriately, the brightness of the image in the field of view can be made almost uniform, and there is no need to inspect whether there are any scratches on the bottom of the hollow body. In some cases, the center of the image in the field of view can be made darker than the other parts to make the inner peripheral wall surface of the hollow body stand out, so it is not difficult to see and the efficiency of inspection work can be improved. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view showing an example of a conventional hollow body inner wall surface inspection apparatus. 11...Cylinder, 12...Eyepiece, 13...
Fisheye lens, 14...Lens, 15...Outer cylinder, 1
6... Optical fiber, 17... Light source, 18... Bottomed cylinder (hollow body), 19... Optical axis, 20... Image point, 21... Shielding member (disk), 22... Bottom,
23... Inner peripheral wall surface.

Claims (1)

[Scope of utility model registration request] An eyepiece lens is provided on the base end side of the cylindrical body, and a fisheye lens inserted into the hollow body is provided on the distal end side.
A plurality of lenses are provided inside the cylindrical body, and a plurality of optical fibers extending along the axis of the cylindrical body are embedded in the circumferential direction inside the peripheral wall of the cylindrical body, and a light source is provided at the base end of the optical fiber. connected to the fisheye lens, the distal end thereof is opened in a divergent shape so that light from the light source can be irradiated from the peripheral part of the fisheye lens along the inner wall surface of the hollow body, and a shielding member is provided at a predetermined position of the optical axis of the fisheye lens. An apparatus for inspecting the inner wall surface of a hollow body.