JP2008076370A - Radiation shielded camera for working - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact photographing camera of excellent portability, capable of enhancing omnidirectional radiation shielding performance of the camera used for monitoring and confirming visibly remote working under a radiation environment or the like, and a camera for working capable of regulating a view field by changing an attitude of the camera during the working when executing an operation such as the remote working. <P>SOLUTION: This camera is formed with shielding structure capable of filling a radiation shielding material to the limit, while obtaining an image, by periscope structure arranged with a camera main body 2 in the central lower part of a shielding main body 1, provided with a camera side conical optical path 4 in front thereof, installed with a mirror body 5 inclined to bend right-angledly an image optical axis 11, and installed with a subject side conical optical path 6 in front thereof. The camera is provided with a rotary operation mechanism capable of changing the attitude of the camera during the working, to regulate the view field, by forming multistructure of the shielding main body 1 and a shielding outer case 7 and by mounting a driving motor 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a work camera used for visual recognition of a work in a radiation environment such as a nuclear power plant, a nuclear fuel treatment facility, a nuclear waste treatment facility, a nuclear waste storage facility, and a nuclear facility dismantling work.

Conventionally, for work in a radiation atmosphere, a camera with a mirror attached to the front of the camera and using a reflection to capture the image by bending the optical path and shielding the exterior case from radiation has been used. Was monitored and visually observed.

For example, in Japanese Patent Application Laid-Open No. 7-270594, a mirror is arranged obliquely in front of the camera to capture a reflected image, and casings other than the window for photographing are specified under the condition that the source of radiation is specified in one direction, and the periphery is a lead plate In addition to being able to take a picture close to the radiation source by shielding at the same time, the lifetime was extended.

Japanese Patent Laid-Open No. 4-188098 has a structure in which a refracting mirror and a cylindrical cavity are arranged in front of the camera, the camera field of view is bent at a right angle, and the outer casing is made into a flask shape and the shielding material is thickened outward. With this structure, the shielding performance is improved.

JP-A-7-270594 JP-A-4-188098

However, for example, in the structure of JP-A-7-270594, a structure in which the casing is surrounded by a lead plate is adopted. However, since the image entrance opening is large and the casing is not filled with a shielding material, the direction from a direction other than the specified direction is set. Since radiation is incident directly without being shielded, there is a problem that cannot be adequately protected for various devices including image sensors and semiconductors when shooting in moving work where the direction of the radiation source cannot be specified. It was.

Further, in the structure of Japanese Patent Laid-Open No. 4-1888098, the shielding material is thickened toward the outside to obtain the shielding thickness up to the outer surface. However, since the cavity shape is made cylindrical at the image incident opening portion, the necessary optical path There is a problem that the gap is not filled with a shielding material other than the above, the shielding thickness is thinner than the other parts, the shielding effect is inferior, and it is partially not protected from radiation. Further, since the structure is set in advance, there is a problem that the posture of the camera cannot be changed during the work.

Therefore, the present invention causes a phenomenon in which the direction of the radiation source cannot be specified along with the work operation, for example, when it is attached to a robot arm or manipulator by remote work in a radiation environment. Visualization that can improve the working posture in order to provide a work camera that is small and has good portability while being improved, and to enable fine adjustment of the line of sight while widening the observation field of view accompanying the work An object of the present invention is to provide a work camera with excellent performance.

In order to achieve the purpose of improving the shielding performance and reducing the size and improving the portability, the radiation shielding structure is filled inward. That is, the present invention has a cylindrical outer shape. A camera body is arranged at the lower center of the axis of the shielding body, a hollow optical path is provided in front of the light receiving portion of the camera body, and the optical axis passing through the hollow optical path is coaxial with the shielding body axis. A tilted mirror body is installed to form a periscope structure, and the optical path is conical so that the radiation shielding material can be filled to the limit.

Furthermore, in order to realize another purpose, a wide viewing angle and fine line-of-sight adjustment, the shielding body is rotated. That is, a radiation shielding outer case is attached to the camera side of the shielding body so that the shielding body having a conical optical path can be held before and after the mirror so that the radiation shielding material can be filled to the limit in the periscope structure, and the drive motor is mounted on the radiation Fixedly attached to the shielding outer case, the output shaft of the drive motor passes through the center of the outer case and is connected to the inner shielding main body, and the camera main body and the mirror body are coaxially integrated to rotate (panning) the shielding main body. It is in the place where it was made to do.

As is clear from the above description, since the conical optical path is adopted for the shielding body, the image reflected by the mirror reaches the image sensor, but the radiation of the rectilinear radiation does not cover the entire area except the conical optical path of the shielding body. Since it is filled and the shielding thickness is secured in all directions, it can be completely shielded. In other words, instead of increasing the thickness of the shielding body outward, it is possible to reduce the size and weight while ensuring the shielding thickness, and attach it to manipulators, robot arms, cranes, etc. that work in the radiation environment area. Therefore, it is possible to obtain a great effect on the portability without being affected by the direction of the radiation as a camera used for work.

Furthermore, by combining a drive motor with the shielding body and shielding exterior case, a wide range of field of view can be obtained by rotating operation (panning), and a stable image can be obtained by rotating the camera body and mirror together in a coaxial integrated structure. It is also possible to make fine adjustments when you want to shift your line of sight slightly. In other words, it is possible to adjust the field of view by changing the posture of the camera during work, thereby bringing about an excellent effect in improving workability in a remote place.

Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 is a side view of a radiation shielding work camera according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. 1 is a radiation shielding body, 2 is a camera body, and 3 is an image sensor built in the camera body. 4 is a camera-side conical optical path, 5 is a mirror, 6 is a subject-side conical optical path, 7 is a radiation shielding outer case, 8 is a driving motor, 9 is a motor output shaft, 10 is a shielding body axis, and 11 is an image. An optical axis 12 indicates a rotation operation line.
That is, in FIG. 1, the camera body 2 is arranged at the lower center of the shielding body axis 10 of the cylindrical shielding body 1 using the radiation shielding material, and the camera side conical optical path is in front of the light receiving part of the camera body 2. 4 is provided, and a mirror body 5 that is inclined on the same axis of the shielding main body axis 10 so as to bend the image optical axis 11 at a right angle is installed, and a subject-side conical optical path 6 is installed in front of the mirror body structure. The optical path has a conical shape so that a radiation shielding material can be filled to the utmost to secure a shielding thickness in all directions in the vertical and horizontal directions with respect to the camera body 2. Is vertically used, and the subject-side conical optical path 6 is set up horizontally like a periscope, but it is also possible to use it lying down for observation of a narrow part such as the inner wall of a pipe.
Further, a radiation shielding outer case 7 for holding the shielding body 1 having the camera body 2, the mirror body 5, the camera-side cone-shaped optical path 4 and the subject-side cone-shaped optical path 6 is provided on the camera body 2 side of the shielding body 1. The drive motor 8 is installed on the same axis of the shield main body axis 10 and fixedly mounted on the shield outer case 7. The drive motor output shaft 9 passes through the center of the outer case 7 and is coupled to the inner shield body 1. However, the camera can be swung left and right or finely adjusted while driving.
In this radiation shielding outer case 7, if it is made thin, a light weight reduction effect can be obtained, and if it is made thick, an effect of increasing the shielding thickness can be obtained, and each of the shielding main body 1 and the radiation shielding outer case 7 is made into a composite structure. It is also possible to change the shielding material, making it easier to design the shielding effect and the thickening effect.
Moreover, if the drive motor 8 is installed so as to cover the radiation shielding outer case 7, the radiation to the drive motor 8 can be shielded. The radiation shielding outer case 7 can also be used as a joining jig when attached to a work arm or the like.
In FIG. 2, the shielding main body 1 is moved as indicated by a rotational operation line 12 so that the image optical axis 11 is panned.

It is a vertical side view which shows the whole structure of this invention. It is a top view which shows the image of the Example panning of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiation shielding main body 2 Camera main body 3 Image pick-up element 4 Camera side conical optical path 5 Mirror body 6 Subject side conical optical path 7 Radiation shielding outer case 8 Drive motor 9 Motor output shaft 10 Shielding main body axis 11 Image optical axis 12 Rotation operation line

Claims (2)

The camera body is arranged at the lower center of the axial center of the shielding body having a cylindrical outer shape, and a hollow optical path is provided in front of the light receiving part of the camera body, and the optical axis passing through the hollow optical path is bent at a right angle. Installed a tilted mirror on the same axis of the shielding body axis to make a periscope structure, and made the conical shape of the optical path before and after the mirror so that the radiation shielding material could be filled inside as much as possible. Radiation shielding work camera characterized by The camera body is arranged at the lower center of the axial center of the shielding body having a cylindrical outer shape, and a hollow optical path is provided in front of the light receiving part of the camera body. A tilting mirror is installed to form a periscope structure, and a radiation shielding outer case is provided so that a shielding body having a conical optical path can be held before and after the mirror so that the radiation shielding material can be filled to the limit. Mounted on the camera side of the shielding body, the drive motor is fixedly mounted on the radiation shielding outer case, the output shaft of the driving motor penetrates the center of the outer case and is coupled to the inner shielding body, and the shielding body is rotated. A radiation-shielding work camera characterized by moving (panning).

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