JP2801265B2 - In-pipe observation camera capable of distinguishing between top and bottom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The in-pipe observation camera of the present invention is used for observing the inner surface of various pipes such as gas pipes, electric wiring pipes, and water pipes. The upper and lower parts can be electrically distinguished for observation.

(Prior Art) An in-pipe observation camera illuminates the inside of a pipe with light from an illuminating device, and an image capturing section images the inside of the pipe so that the inside of the pipe can be observed. Conventionally, a steel ball C is freely moved into the glass container B from the objective lens A to the subject side as shown in FIG. A top and bottom discriminating body D accommodated as much as possible is installed, and the steel ball C is projected together with the subject on the observation screen of the image guide, and the top and bottom are discriminated from the position of the steel ball C.

(Problems to be Solved by the Invention) The conventional in-pipe observation camera has the following problems.

. Since the subject is projected on the observation screen, bits,
The image is adversely affected in terms of image range, brightness, and the like.

. If the discriminator D is not separated from the objective lens A to some extent, focusing cannot be achieved, so that it is inevitably increased in size and reduced in size.

. Since the discriminating body D can be installed only on the lens surface or the element surface E, there is a restriction on the mounting position.

. Since it is a mechanical discrimination method, it cannot be processed electrically.

(Purpose of the invention) The purpose of the invention is to reduce the size of the image without adversely affecting the image.
It is another object of the present invention to provide an in-pipe observation camera that can be electrically distinguished from the top.

(Means for solving the problems) The in-pipe observation camera capable of distinguishing the top and bottom of the present invention is shown in FIGS.
As shown in FIG. 3, in an in-pipe observation camera in which the inside of a pipe is illuminated by light from a lighting device and an image of the inside of the pipe is taken by an imaging unit, a resistor film 2 is formed in a donut shape on an insulating plate 1. A gap 8 is formed between a processed resistance member 4 in which a notch 3 is formed in a part of the resistance film 2 and a conductive member 7 in which a conductive object 6 is processed into a donut shape on an insulating plate 5. Lead wires 9 and 10 are drawn out from the resistor coating 2 and the conductive object 6 respectively, and a conductive liquid 11 is inserted into the gap 8 at a right angle to a vertical line. It is sealed so that it can move freely.

(Operation) In FIGS. 1 to 3 which are one embodiment of the present invention, mercury is used as the conductive liquid 11. This mercury is always located below by its own weight even if the objective part F of the in-pipe observation camera rotates, so that when the objective part F rotates, the contact position of the mercury on the resistor film 2 changes. The area of the resistor film 2 interposed between the lead wire 9 and the liquid 11 (mercury) in the closed circuit changes to change the resistance value. On the other hand, when the objective section F rotates, the conductive member 7 also rotates, and the contact position between the conductive object 6 and mercury also changes, but the resistance value does not change. Therefore, the rotation angle of the objective section F is electrically calculated by measuring the change in the resistance value in the entire closed circuit with the measuring device 12.

Incidentally, assuming that the resistance value of one round of the resistor film 2 is 100 kΩ, the resistance value of the main rotation angle is as shown in the following table.

(Embodiment) Reference numeral 4 in FIGS. 1 to 3 denotes a resistance member which is a doughnut-shaped insulating film 1 having a resistor film 2 (oxide film: for example, ruthenium oxide) having an appropriate resistance value. And a part thereof is cut out to form a cutout portion 3.

Reference numeral 7 in FIGS. 1 to 3 denotes a conductive member, which is a disk-shaped insulating plate 5 in which a conductive object 6 is formed in a donut shape. No cutout is formed in the conductive object 6.

The resistance member 4 and the conductive member 7 are formed by an outer cylinder 13 and an inner cylinder 14.
And are opposed to each other. In this case, the resistor film 2 and the conductive object 6 face each other with a gap 8 provided therebetween.

The outer cylinder 13 and the inner cylinder 14 are both made of an insulating material. As shown in FIG. 1, the respective end faces of the two cylinders 13 and 14 are formed on the surface of the resistor film 2 of the resistance member 4 and the conductive It is adhered and fixed concentrically to the surface of the object 6.

The insulating member 4 and the conductor member 7 are disposed in the gap 8 such that the center axes of the donut-shaped resistor film 2 and the conductor film 6 are substantially perpendicular to the vertical line. The conductive liquid 11 (mercury) can freely move substantially perpendicularly to the vertical line while contacting the surface of the resistive coating 2 and the surface of the conductive object 6.

1 to 3, reference numerals 9 and 10 denote lead wires. One end of the lead wire 9 is provided on the surface of the resistor film 2 as shown in FIG.
As shown in FIG. 1, one ends of the lead wires 10 are soldered to the surface of the conductive object 6 respectively, and are drawn out from the inside of the inner cylinder 14 to the outside. Lead wires 9 and 10 are connected to the surface of the resistive coating 2 or the surface of the conductive object 6 inside the inner cylinder 14 as shown in FIG. However, since the inner cylinder 14 has only an end face adhered and fixed to the surface of the resistor coating 2 and the surface of the conductive object 6, the inner wire 14 is connected to the lead wire 9 and the conductive liquid 11 (mercury). And between the lead wire 10 and the conductive liquid 11 (mercury). Therefore, when the measuring device 12 is connected to the other ends of the leads 9 and 10, respectively, the measuring device 12-lead 9-resistor coating 2-conductive liquid 11 (mercury) -conductive object 6-lead 10- The measuring device 12 conducts to form a closed circuit.

(Effect of the Invention) According to the present invention, the in-pipe observation camera capable of distinguishing the top and bottom has the following effects.

.1 Since the conductive liquid is not shown in the image, the focus, image range, brightness, etc. of the image are not adversely affected.

. Since there is no need to focus the discriminator, the size can be reduced.

. This is convenient because the discriminating body D can be set arbitrarily anywhere, not only on the lens surface or the element surface.

. Since electric signal processing can be performed, it is convenient for post-processing.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an objective part of an in-pipe observing camera according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. FIG. 4 is a longitudinal sectional view of an objective part of a conventional in-pipe observation camera. 1 is an insulating plate 2 is a resistor film 3 is a cutout portion 4 is a resistance member 5 is an insulating plate 6 is a conductive object 7 is a conductive member 8 is a gap 9, 10 is a lead wire 11 is a conductive liquid

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhide Miyazaki 5-1-9 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Prefecture Furukawa Electric Industry Co., Ltd. (72) Inventor Kozo Sato 5-1-9 Higashi-Yawata, Hiratsuka-shi, Kanagawa Furukawa Inside the Hiratsuka Plant of Electric Industry Co., Ltd. (72) Inventor Kazuhiro Iida 4-83-3 Shibaura, Minato-ku, Tokyo Inside Kaneki Electric Works Co., Ltd. (56) References JP-A-2-41129 (JP, A) JP-A-59-200623 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 23/00

Claims (1)

(57) [Claims] 1. The inside of a pipeline is illuminated with light from a lighting device,
In an in-pipe observation camera in which an inside of a pipe is imaged by an imaging unit, a resistance film (2) is processed into a donut shape on an insulating plate (1), and a cutout is formed in a part of the resistance film (2). A gap (8) is formed between a resistance member (4) formed with (3) and a conductive member (7) formed by processing a conductive object (6) into a donut shape on an insulating plate (5). Lead wires (9) and (10) are drawn out from the resistor coating (2) and the conductive object (6), respectively, and electrically conductive liquid is introduced into the gap (8). (11) An in-pipe observing camera which can be distinguished vertically and vertically, which is enclosed so as to be freely movable substantially perpendicular to the vertical line.