JPH04254692A - Borehole inside photographing device - Google Patents

Abstract

PURPOSE:To improve functionality of a photographing device by providing an observation translucent window at the lower and also providing a light source and its reflection section and a light guide section for guiding a reflected light downward in an outer casing in which a TV camera is enclosed. CONSTITUTION:A translucent window 4 is provided at the lower end, the entire lower circumference is formed of a light guide section 5 consisting of transparent glass, and a watertight outer casing 1 whose upper end is made a reflection section 6 is provided. Then, a conical cylindrical shade hood 7 is provided in the casing 1 and plural light source lamps 3 are disposed around the hood. Then, a TV camera 2 is provided above the hood 7 to allow photographing the conditions of the borehole inside while the well borehole inside is illuminated by radiation beams from the light guide section 5. In addition, the camera 2 may be disposed in the lower section of the outer casing 1 with one lamp provided above the camera or the light guide section may be formed of a metal plated double cylindrical pipe or glass fiber bundles. This allows the device to be compact and vivid images to be photographed without halation.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a device that is suspended and inserted into a bore hole or well drilled in the ground to directly observe the condition of the hole wall and obstacles inside the hole. It is related to.

0002

[Prior Art and Problems to be Solved by the Invention] Conventionally, in order to investigate the characteristics of geology and faults in the ground, for example,
This is carried out by inserting a sonde into the borehole, which is equipped with a camera that observes the entire circumference of the hole wall, suspended from the ground. However, if there is an obstacle such as a rock in the borehole that prevents the sonde from descending, the sonde must be retrieved and
There was the inconvenience of having to drill again to remove the above-mentioned obstacles, then lower the sonde and resume observation. Therefore, before lowering the observation sonde, it is necessary to install a TV into the hole.
It is effective to insert a camera and visually check the condition of the obstacles in the hole. In addition, in the above-mentioned directional observation of the hole wall, when observing only the depth of a characteristic geological part without observing the entire depth of the hole wall, it is necessary to insert a TV camera into the hole in advance as described above. It is important to understand the depth of such characteristic geological parts.

[0003] As a TV camera to be used in advance in the above case, for example, as shown in FIG.
The outer cylinder (1) has a plurality of lamps (3) on its periphery on the open end side, and an in-hole imaging device equipped with a light-transmitting window (4) made of transparent glass or the like in the center. A TV camera (2) is installed inside the outer tube (1) consisting of a waterproof case with one end closed, as shown in Figure 6.
An in-hole photographing device is equipped with a lamp (3) installed around the camera (2), and a transparent window (4) made of transparent glass or the like is completely attached to the open end of the outer cylinder (1). was used.

However, in such a photographing device,
If the TV camera and the lamp are too close together, the lamp will generate a large amount of heat, making the TV camera inoperable. For this reason, a sufficiently insulating structure must be provided, which makes it difficult to downsize the device itself. As a result, a large diameter bore hole is required to be drilled in the ground, which has disadvantages such as increased work costs. Similarly, it is difficult to increase the lamp capacity to further improve performance. Furthermore, if a lamp and a camera are installed in the same room as shown in Figure 6, the light from the lamp will be scattered by the light-transmitting window or directly reflected and enter the field of view of the TV camera, which may adversely affect the TV image. get up.

[0005]

[Means for Solving the Problems] In view of the above, the present invention has developed an in-hole photographing device that solves all of these problems. Specifically, one of the devices of the present invention is a cylindrical outer cylinder whose upper end is closed, a transparent window for observation is provided at the lower end, and the inside is watertight, and is suspended in the axial direction into a hole drilled in the ground. In this device, the upper part of the conical cylindrical light-shielding hood that expands downward and the outer cylinder are connected to each other. A plurality of light sources are installed in the gap, a reflecting part that reflects the light downward and a light guide part that guides the reflected light into the hole below the outer cylinder are provided in the outer cylinder, and the hood is installed above the light-shielding hood. The present invention is characterized in that a TV camera for photographing the downward view through the hood is installed in a housing connected to the hood.

[0006] Another device of the present invention is a probe that is made up of a closed cylindrical outer cylinder at the upper end and a transparent observation window at the lower end and is watertight inside, and is suspended in the axial direction and drilled into the ground. In this device, the probe is lowered into a hole, the inside of the hole below is illuminated by a light built into the probe, and the situation is photographed by a TV camera built into the probe. , a light source is provided above the TV camera, and a reflecting portion that reflects the light downward and a light guide portion that guides the reflected light into a hole below the outer cylinder are further provided in the outer cylinder. It is something.

[0007]

[Function] Since the outer cylinder is used as the light guiding portion as described above, the outer diameter of the outer cylinder can be made small and the structure is simple and compact. Furthermore, since the entire light guiding section can be made of a water-stopping structural member, such as transparent glass or transparent resin, it has excellent water pressure resistance. In addition, a TV camera is installed in a housing connected to a conical cylindrical light-shielding hood that expands downward.
The light source is installed outside the TV camera, or the light source is installed above the TV camera, so that the camera and the light source can be separated by heat insulation, so the effect of heat generated by the light source on the TV camera can be reduced, making it possible to use a large-capacity lamp. etc. can be used. Furthermore, in a device in which a light source is provided above the TV camera, it is only necessary to install one light source, so the outer diameter of the outer cylinder can be made smaller. Furthermore, since the light guiding section through which the light from the light source passes and the viewing transparent window of the TV camera are separated, halation due to light does not occur, and therefore a good image can be obtained. Note that the reflecting portion may be a conical cylinder whose inner surface is mirror-finished, or may be a ring-shaped prism. Further, the light guide portion does not have to be made of transparent glass as described above, but may be made of a simple hollow portion.

[0008]

[Embodiment] Next, an embodiment of the present invention will be described. (Example 1) As shown in Fig. 1, the entire lower part of a cylindrical outer cylinder (1) with a closed upper end is formed into a light guide part (5) made of transparent glass, and the upper end is formed into a light-reflecting part (5). Part (6)
And so. A plurality of lamps (3) serving as light sources are placed in the wide gap between the upper part of the conical cylindrical light-shielding hood (7) that extends downward inside the outer cylinder (1) and the outer cylinder (1) in the circumferential direction. In addition, the hood (7) is installed in a housing (8) connected to the hood above the light-shielding hood (7).
) A TV camera (2) was installed to take pictures of the area below. A wide conversion lens (9) was attached to the lower end of the light-shielding hood (7) to enlarge the field of view for the camera (2). In addition, a transparent window (4) made of transparent glass was attached to the lower end of the outer tube (1) to seal the inside of the outer tube (1) watertight. In the figure, (10) is a camera centering device consisting of a screw mechanism for positioning the TV camera on the central axis of the outer cylinder (1), and (11) and (1)
2) is the TV camera cable and power cable that connect to the ground control equipment. According to such a photographing device, the lamp (3) and the TV camera (2) are connected to the light-shielding hood (7).
) and the housing (8), so there is no effect of heat generation on the camera, and furthermore, it is possible to increase the capacity of the lamp (3). In addition, the light for illumination inside the hole passes through the light guide part (5) and passes through the TV camera (
2) Since the structure is such that the light that enters passes through the transparent window (4), the two lights are completely separated and will not adversely affect the image of the TV camera. Furthermore, since the light guide section is provided in the outer cylinder, space can be further saved.

(Embodiment 2) As shown in FIG. 2, a TV camera (2) for photographing the lower part of the outer cylinder (1) is provided at the lower part of the outer cylinder (1) with the upper end closed. (2
) A transparent window (4) made of transparent glass for observation was provided at the lower end of the outer cylinder (1) to seal the inside of the outer cylinder watertight. Also, above the TV camera inside the outer tube (1) is a lamp (
3) is provided at the center of the cross section of the outer cylinder, and further includes a reflecting part (6) that reflects the light and a light guide part (5) made of transparent glass that guides the reflected light into the hole at the bottom of the outer cylinder. Formed at the bottom of the outer cylinder. In the figure, (13) indicates a heat insulating plate that blocks the heat generated from the lamp (3). Such an in-hole imaging device is more compact compared to the case of Example 1,
Furthermore, since there is only one light source lamp, the structure of the device becomes even simpler.

(Embodiment 3) As shown in FIG. 3, in the apparatus of Embodiment 2, the light guide section (5) was replaced with transparent glass.
The device was constructed using a hollow double cylindrical tube (15) whose opposing inner surfaces were plated with metal (14), and a ring-shaped prism (16) was used as the reflective section (6). Note that the TV camera is not shown in FIG. According to such a device, it is possible to further reduce the attenuation loss of light in the light guide section.

(Embodiment 4) As shown in FIG. 4, in the apparatus of Embodiment 2, the light guide section (5) was replaced with transparent glass.
The apparatus was made of a cylindrical piece made by bundling a large number of glass fibers (17) and used a ring-shaped prism (16). Note that the TV camera is not shown in FIG. According to such a device, it is possible to reduce the attenuation loss of light at the light guide part, and at the same time, the straightness of the light that illuminates the lower part of the outer cylinder (1) is improved, so TV shooting can be performed deeper. It becomes possible.

0012

As described above, according to the present invention, the TV camera and the light source can be completely separated, and the outer cylinder is used as a light guiding section for irradiation light, so that the photographing device inside the hole in the ground can be used easily. It can be made more compact, and the light irradiated from the light source into the hole and the TV
Since it is possible to reliably separate the light incident on the camera,
There is no fear of halation in the image taken by the V camera, and there are remarkable effects such as the ability to capture this image more clearly.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of the present invention.

FIG. 2 is a side sectional view showing another embodiment of the invention.

FIG. 3 is a side sectional view showing still another embodiment of the present invention.

FIG. 4 is a side sectional view showing still another embodiment of the present invention.

FIG. 5 is a side sectional view showing a conventional example.

FIG. 6 is a side sectional view showing another conventional example.

[Explanation of symbols]

1 Outer tube 2 TV camera 3 Lamp 4 Translucent window 5 Light guiding part 6 Reflection part 7. Light blocking hood 8 Housing 9 Wide conversion lens 10 Camera centering device 11 TV camera cable 12 Power cable 13　Insulation board 14 Metal plating 15 Double cylindrical tube 16 Ring-shaped prism 17 Glass fiber

Claims (2)

[Claims] Claim 1: A cylindrical outer cylinder whose upper end is closed, a transparent observation window is provided at the lower end, and the inside is watertight is suspended in the axial direction and lowered into a hole drilled in the ground, In a device that illuminates the inside of a hole below with a light built into an outer cylinder and photographs the situation with a TV camera built into the outer cylinder, a light source is installed in the gap between the upper part of a conical cylindrical light-shielding hood that expands downward and the outer cylinder. A housing in which a plurality of light-shielding hoods are installed, a reflecting part that reflects the light downward and a light guide part that guides the reflected light into a hole below the outer cylinder are provided in the outer cylinder, and the housing is further connected to the hood above the light-shielding hood. An in-hole photographing device characterized in that a TV camera is installed inside the hole to photograph the downward view through the hood. 2. A cylindrical outer cylinder whose upper end is closed, a transparent window for observation is provided at the lower end, and the inside is watertight is suspended in the axial direction and lowered into a hole drilled in the ground, In a device that illuminates the inside of a hole below with a light built into an outer cylinder and photographs the situation with a TV camera built into the outer cylinder, a TV camera is provided at the lower part of the outer cylinder to photograph the lower part of the outer cylinder, and the TV camera
In-hole photography characterized in that a light source is provided above the camera, and a reflecting part that reflects the light downward and a light guide part that guides the reflected light into the hole below the outer cylinder are provided in the outer cylinder. Device.