JPH06311401A - Bore hold television camera device - Google Patents

Abstract

PURPOSE:To easily observe all around periphery extension image and a partial extension image by a single camera zonde by enabling the switching of the observation function of the partial periphery of hole wall by a plane mirror and the observation function of the all around periphery of the hole wall by a conical mirror. CONSTITUTION:In the central part and the lower part within a camera zonde 11, a television camera 16 photographs a hole wall 20 illuminated by a bulb 19 for illumination through a cylindrical glass window 18 via a plane mirror 17A which is inclined 45 deg. and a 45 deg. inclined conical mirror 17B is not used in this state. The television camera 16 places the plane mirror 17A within a visual field and photographs the partial periphery of the hole wall 20 illuminated by the bulb 19 for illumination through the cylindrical glass window 18. Further, a mounting bracket 28 is driven upwards, the plane mirror 17A is made to rotate against, the spring provided on a rotary axis 29 and the plane mirror 17A is removed up to roughly vertical location. The television camera 16 installed on the inside of the camera zonde 11 places all the around of the conical mirror 17B within the visual field and photographs the all around of the hole wall 20 illuminated by the bulb for illumination through the cylindrical glass window 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a borehole television camera device for inserting a television camera into a borehole and observing the state of the hole wall.

[0002]

2. Description of the Related Art Conventionally, a borehole television camera apparatus is provided with a plane mirror tilted at an angle of 45 degrees on the axis of the television camera, and a partial photographing method in which the television camera and the plane mirror are rotated about an axis, and similarly, a 45 degree angle on the axis. There is a omnidirectional photographing method in which a conical mirror having a reflective surface is installed to photograph the entire circumference (360 degrees) of the hole wall at once. The partial imaging method has an advantage that details can be observed in detail because the screen displayed on the television monitor is, for example, about 2 cm square (36 degrees), but has a drawback that the entire image is difficult to understand. Further, the omnidirectional photographing method has an advantage that an entire image can be easily obtained, but since the omnidirectional developed image is displayed on the television monitor, there is a drawback that detailed observation cannot be performed in detail due to the resolution.

[0003]

However, it is cumbersome and economical to individually use two kinds of devices having the function of observing the hole wall portion by the plane mirror and the entire circumference of the hole wall by the conical wall at the field measurement site. Also has a problem. Therefore, the present invention is intended to provide a borehole television camera device capable of observing both a full-circumference developed image and a partial-circumferential developed image with a single camera sonde by simple switching.

[0004]

According to the present invention, a borehole television camera in which a television camera housed in a camera probe is inserted into a borehole, a reflecting mirror is arranged on the axis, and the borehole wall is observed through a cylindrical glass window. In the device, the reflecting mirror is composed of a conical mirror that can observe the entire circumference of the hole wall, and a plane mirror that can be arranged directly above the conical mirror and that can observe the partial circumference of the hole wall in this arrangement, and the plane mirror. Is equipped with a plane mirror moving means having a function of reversibly moving from a position directly above the conical mirror to a position out of the field of view of the television camera, a function of observing a partial circumference of the hole wall by the flat mirror and the entire circumference of the hole wall by the conical mirror. It is possible to obtain a borehole television camera device characterized in that it can be switched with the observation function of.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A borehole television camera device according to the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a structure of a borehole television camera device according to an embodiment of the present invention when observing a partial circumference with a plane mirror. First of all, this device is a camera sonde 1 to be inserted into a boring hole 10.
1. Elevator 12 for raising and lowering this camera sonde,
A controller 13 that controls the camera sonde and the elevator and includes an image processing device, a television monitor 14 that displays a video signal sent from the camera sonde 11, and a system cable (including an electric signal line and a power line) that connects these devices. It consists of fifteen. At the central portion and the lower portion inside the camera sonde 11, the television camera 16 takes an image of the hole wall 20 illuminated by the light bulb 19 for illumination through the cylindrical glass window 18 through the plane mirror 17A inclined at 45 degrees. The 45-degree conical mirror 17B is not used in this state. In the upper part of the sonde, the focus adjusting motor 21 of the TV camera 16,
A compass 22, a power source 23 inside the sonde, a control motor 26 for adjusting the up and down of the support rod 25 are provided, and a depth measuring encoder 24 for detecting the vertical position of the camera sonde 11 is arranged above the sonde. Has been done.

A projection 27 extending laterally at a substantially right angle is fixed to the upper end of the plane mirror 17A, and has a shape in which the letter L is inverted as a whole. This fixed portion is held by a rotary shaft 29 of a mounting member 28 supported by a support rod 25, which has a coil spring (not shown). This coil spring has a spring force capable of pushing up the flat mirror 17A against the force of gravity and pushing it up to an angle of 45 degrees necessary for observation and holding it. The mounting bracket 28 is a flat mirror 17.
A is at the lowest position near the conical mirror 17B. However, the distance between them is not limited. Fixed stopper 30
, Whose function will be described later, is fixed to the camera probe 11 as its name suggests. Although the fixed stopper 30 is drawn so as to block the field of view of the television camera 16 in the figure, it is actually displaced to a position (one side or both sides) perpendicular to the plane of the drawing, which may interfere with measurement. Absent. With the above configuration, the television camera 16 takes a picture of the partial circumference of the hole wall 20 illuminated by the illumination bulb 19 through the cylindrical glass window 18 with the plane mirror 17A in the field of view.

FIG. 2 is a view for explaining the case where the above-mentioned device is adjusted to observe the entire circumference of the hole wall. However, the elevator 12, the controller 13, and the television monitor 14 shown in FIG. 1 are omitted. In this case, unlike the case of FIG. 1, the mounting metal fitting 28 is driven upward by the control motor 26, and the projection 27 mounted on the flat mirror 17A hits the fixed stopper 30 so that the flat mirror 17 is moved.
A is rotated against the spring provided on the rotating shaft 29, and the plane mirror 17A is removed to a substantially vertical position. In this case, it is necessary to operate the focus adjusting motor 21 to change the focal length by about 1 mm or less. With the above settings, the television camera 16 installed inside the camera sonde 11 puts the entire circumference of the conical mirror 17B in the field of view, and through the cylindrical glass window 18, the hole wall 20 illuminated by the lighting bulb 19 is illuminated. Shoot the entire circumference.

In this embodiment, the projection 27 and the fixed stopper 30 are used as the mechanism for moving the plane mirror, but the invention is not limited to this. For example, a method of attaching a very small motor and gear to the attachment 28, or There is also a method of applying a rotational force from above along the support rod 25 using a thin flexible shaft.

[0009]

As is apparent from the above description, in the present invention, by the upper and lower sides of one support rod, a flat mirror for detailed shooting at the time of omnidirectional shooting can be formed by a conical mirror for omnidirectional shooting and a television camera. By storing it outside of the field of view and moving it to a position suitable for side-by-side shooting within the field of view during detailed shooting, it is possible to use the two methods properly and shorten the measurement time. The improvement in economic efficiency is great.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration when photographing an entire circumference of a hole wall in a borehole television camera device which is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration when a partial circumference of a hole wall is photographed by the apparatus of FIG.

[Explanation of symbols]

 10 Boring Hole 11 Camera Sonde 12 Elevator 13 Controller 14 TV Monitor 15 System Cable 16 TV Camera 17A Plane Mirror 17B Conical Mirror 18 Cylindrical Glass Window 19 Light Bulb 20 Hole Wall 21 Focusing Motor 22 Compass 23 Inside Power Source 24 Depth Measurement Encoder 25 Support rod 26 Control motor 27 Projection 28 Mounting bracket 29 Rotating shaft 30 Fixed stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumio Sakata 2-17-20 Yanagisawa, Hoya City, Tokyo Sakata Electric Co., Ltd.

Claims (1)

[Claims] 1. A borehole television camera device in which a television camera housed in a camera sonde is inserted into a borehole, a reflecting mirror is arranged on an axis, and the hole wall is observed through a cylindrical glass window. It is composed of a conical mirror whose circumference can be observed and a plane mirror which can be arranged directly above this conical mirror and in which the partial circumference of the hole wall can be observed, and the position of the plane mirror directly above the conical mirror. To a position out of the field of view of the television camera, and a plane mirror moving means having a function of reversibly moving the television camera is provided, and the observation function of the partial circumference of the hole wall by the plane mirror and the observation function of the entire circumference of the hole wall by the conical mirror can be switched Borehole TV camera device characterized by having both.