JP2004170662A

JP2004170662A - Camera case

Info

Publication number: JP2004170662A
Application number: JP2002336102A
Authority: JP
Inventors: Masaji Mogami; 雅次最上
Original assignee: Hitachi Kokusai Electric Inc
Current assignee: Hitachi Kokusai Electric Inc
Priority date: 2002-11-20
Filing date: 2002-11-20
Publication date: 2004-06-17

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera case for the use of volcano observation, in which heat conduction is delayed to keep the life of the internal camera for a few minutes, by covering the outside of the body of a water-cooled camera case with a refractory covering material, providing a cooling water reservoir on the back, and pseudo-evacuating inside a double glass structure on the front consisting of heat resisting glass subjected to reflection coating and heat-absorbing glass. <P>SOLUTION: The camera case with a built-in camera for imaging incident light is equipped with a cooling means for cooling the camera case with a coolant and a cooling reservoir for storing the coolant in the cooling means, and the outside of the camera case is coated for heat resistance. The front glass has a double glass structure which is pseudo-evacuated in-between. The outside of the cylindrical camera case 1 is coated with a heat-resistant covering material 2, while the cooling reservoir 3 is installed in the back of the camera case 1. The camera case is designed so that, even when the supply of cooling water is stopped because an external cooling tube is cut off for some reason, the water stored in the cooling reservoir 3 circulates inside the camera case 1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、火山活動、火災、ガス爆発等、高熱を発する事故の発生直後も監視を続けるための監視用カメラに使用するカメラケースに関する。
【０００２】
【従来の技術】
従来の監視カメラを内蔵するカメラケースでは、監視対象が高熱源の場合、放熱や冷却が十分でないと、カメラが動作しなくなる。
従って、従来は、例えば、カメラの側面に熱受板を接合し、熱受け板をカメラケースに取り付けて放熱させる構成のカメラケース構造がある（例えば、特許文献１参照。）。
【０００３】
また、カメラケースの前部と後部を覆ってカメラを保護するパネルを
図２は、従来の水冷式カメラケースの構成を示す図である。図２（ａ）がカメラケース２０１の正面図で、被写体からの光が紙面の上から下に向かって入射する。また図２（ｂ）が側面図で、被写体からの光が矢印２００の方向に入射する。
カメラケース２０１は、円筒形で内外面が中空の二重構造となっており中に冷却水を循環させて内部の温度上昇を防ぐ構造となっている。この冷却水は、外部から冷却管によってカメラケース２０１に供給する構造になっている。
この構造だけでは、火山活動が発生した場合には、前面ガラスを通して火砕流等に起因する熱が、すぐにカメラケース２０１内に侵入し、カメラケース２０１内のカメラは、高熱になり、動作温度以上となるため作動しなくなる。
【０００４】
【特許文献１】
特開平１０−３２５９７５号公報
【発明が解決しようとする課題】
前述の従来技術では、停電や、外部からの冷却管が火砕流等により破壊されることにより、すぐに断水となる。このため、火砕流等の熱が、カメラケース周囲および、前面ガラス、背面側から、大量の伝熱し、内部温度が急上昇する。そして、その結果、監視カメラが、数秒で作動しなくなる。
本発明はの目的は、上記のような問題を解決し、火山の噴火等によって火砕流が発生しても、数分間内部温度を動作保証温度範囲内に維持し、カメラが作動するようにすることにある。
【０００５】
【課題を解決するための手段】
上記の目的を達成するために、本発明のカメラケースは、その外面に耐熱被覆を施したものである。
また、本発明のカメラケースは、その背面に冷却水溜りを設けたものである。
また、本発明のカメラケースは、前面側を二重ガラスにし更にガラス間を擬似真空にし、熱の伝導をし難くしたものである。
即ち、本発明のカメラケースは、入射された光を撮像するカメラを内蔵するカメラケースにおいて、カメラケースを冷却媒体で冷却する冷却手段と、冷却手段に冷却媒体を溜める冷却溜りとを備えたものである。
また、本発明のカメラケースは、入射された光を撮像するカメラを内蔵するカメラケースにおいて、カメラケースの外側を耐熱被覆としたものである。
また、本発明のカメラケースは、前面ガラスを通して入射された光を撮像するカメラを内蔵するカメラケースにおいて、前面ガラスが二重ガラス構造であって、二重ガラスの間を擬似真空にしたものである。
【０００６】
【発明の実施の形態】
以下、本発明の一実施例を図１と図３によって説明する。
図１は、本発明のカメラケースの一実施例の外形斜視図である。
耐熱被覆材２が円筒形のカメラケース１の外側を被覆し、カメラケース１の背面側には冷却水溜り３を設け、なんらかの原因で外部からの冷却管が切断され冷却水の供給が途絶えても、この冷却水溜り３に蓄えられた水がカメラケース１内を循環する構造としている。
【０００７】
更に、図３は、本発明の一実施例のカメラケース１の前面部の断面を示す図である。
図３が示すように、カメラケース１の前面側は、二重のガラスにする。前側は、反射コーティングを施した耐熱ガラス４で、内側は、熱線吸収ガラス５を設けている。
両ガラス４，５の間に、空気抜き用のゴム栓６があり、ここから空気を抜いて擬似真空とする。また、図１が示すように、カメラケース１の内部には、監視用のカメラ７、及び、レンズ８が収納されている。
ここで９は、カメラケース１のパン、チルトを可動させるための雲台（旋回台）を示し、１０は、カメラケース１の日除けカバーを示す。
【０００８】
以上の如く、本発明のカメラケースは、耐熱被覆を施し、更に、前面ガラスを二重構造にして、高熱発生から数分間監視ができるようにした監視用カメラに使用する。
以上のような構造にすることにより、本発明のカメラケースに内蔵されたカメラは、火山活動開始から、数分間、火山監視ができるようにすることができる。
上記実施例では、冷却に水を用いたが、冷却用の媒体であれば、水以外の液体でも良く、凍結防止薬の入った水でも良く、また、液体ではなく、液体でも良い。
【０００９】
【発明の効果】
以上のように本発明によれば、火山活動等、高熱を発する事故の発生後、伝熱計算上、温度上昇により、数秒間の監視しかできなかった監視カメラの対温度寿命を、数分間延長することができる。
【図面の簡単な説明】
【図１】本発明の一実施例を示す外形斜視図。
【図２】従来の水冷式のカメラケースの構成を示す図。
【図３】本発明の一実施例のカメラケースの前面部の断面を示す図。
【符号の説明】
１：カメラケース本体、２：耐熱被覆材、３：背面部冷却水溜り、４：反射コーティング耐熱ガラス、５：熱線吸収ガラス、６：空気抜き用ゴム栓、７：監視カメラ、８：レンズ、９：カメラケース可動雲台、１０：日除けカバー。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera case used for a surveillance camera for continuing monitoring immediately after an accident that generates high heat, such as a volcanic activity, a fire, or a gas explosion.
[0002]
[Prior art]
In a camera case incorporating a conventional surveillance camera, when a monitoring target is a high heat source, the camera does not operate unless heat radiation or cooling is sufficient.
Therefore, conventionally, for example, there is a camera case structure in which a heat receiving plate is joined to a side surface of a camera, and the heat receiving plate is attached to a camera case to dissipate heat (for example, see Patent Document 1).
[0003]
FIG. 2 is a diagram showing a configuration of a conventional water-cooled camera case that covers a front part and a rear part of the camera case to protect the camera. FIG. 2A is a front view of the camera case 201, in which light from a subject enters from the top to the bottom of the paper. FIG. 2B is a side view, in which light from a subject enters in the direction of arrow 200.
The camera case 201 has a cylindrical structure with a hollow inner and outer surface, and has a structure in which cooling water is circulated to prevent an internal temperature rise. The cooling water is supplied to the camera case 201 from the outside by a cooling pipe.
With this structure alone, when volcanic activity occurs, heat due to pyroclastic flows, etc., immediately penetrates into the camera case 201 through the front glass, and the camera in the camera case 201 becomes high heat and exceeds the operating temperature. Will not work.
[0004]
[Patent Document 1]
JP 10-325975 A [Problems to be solved by the invention]
In the above-mentioned conventional technology, water is cut off immediately due to a power failure or a cooling pipe from the outside being destroyed by a pyroclastic flow or the like. For this reason, a large amount of heat such as pyroclastic flow is transferred from around the camera case, the front glass, and the rear side, and the internal temperature rises rapidly. And as a result, the surveillance camera stops working in a few seconds.
An object of the present invention is to solve the above-mentioned problems, and to maintain the internal temperature within the operation guarantee temperature range for several minutes even if a pyroclastic flow occurs due to an eruption of a volcano, and to operate the camera. It is in.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the camera case of the present invention has a heat-resistant coating on its outer surface.
Further, the camera case of the present invention has a cooling water reservoir provided on the back surface thereof.
In the camera case of the present invention, the front side is double-glazed, and furthermore, the space between the glasses is simulated to make it difficult to conduct heat.
That is, the camera case of the present invention is a camera case that incorporates a camera that captures incident light and includes a cooling unit that cools the camera case with a cooling medium, and a cooling pool that stores the cooling medium in the cooling unit. It is.
Further, the camera case of the present invention is a camera case in which a camera for taking an image of incident light is built in, and the outside of the camera case is heat-resistant coated.
Further, the camera case of the present invention is a camera case incorporating a camera that captures light incident through the front glass, wherein the front glass has a double glass structure, and a space between the double glasses is simulated. is there.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is an external perspective view of a camera case according to an embodiment of the present invention.
A heat-resistant coating material 2 covers the outside of the cylindrical camera case 1, and a cooling water reservoir 3 is provided on the rear side of the camera case 1. A cooling pipe from the outside is cut off for some reason, and supply of cooling water is interrupted. This also has a structure in which the water stored in the cooling water sump 3 circulates in the camera case 1.
[0007]
FIG. 3 is a diagram showing a cross section of the front surface of the camera case 1 according to one embodiment of the present invention.
As shown in FIG. 3, the front side of the camera case 1 is made of double glass. The front side is a heat-resistant glass 4 provided with a reflective coating, and the inner side is provided with a heat ray absorbing glass 5.
There is a rubber stopper 6 for releasing air between the two glasses 4 and 5, from which air is evacuated to create a pseudo vacuum. Further, as shown in FIG. 1, a monitoring camera 7 and a lens 8 are housed inside the camera case 1.
Here, 9 denotes a pan / tilt head for moving the pan and tilt of the camera case 1, and 10 denotes a sunshade cover of the camera case 1.
[0008]
As described above, the camera case of the present invention is used for a surveillance camera which is provided with a heat-resistant coating and has a double front glass so that monitoring can be performed for several minutes from the generation of high heat.
With the above structure, the camera built in the camera case of the present invention can monitor the volcano for several minutes after the start of the volcanic activity.
In the above embodiment, water was used for cooling. However, a liquid other than water may be used as the cooling medium, or water containing an antifreezing agent may be used.
[0009]
【The invention's effect】
As described above, according to the present invention, after an accident that generates high heat such as volcanic activity occurs, the heat transfer calculation increases the temperature life of the surveillance camera, which could only be monitored for a few seconds due to temperature rise, for several minutes. can do.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a conventional water-cooled camera case.
FIG. 3 is a diagram showing a cross section of a front portion of a camera case according to one embodiment of the present invention.
[Explanation of symbols]
1: camera case body, 2: heat-resistant coating material, 3: cooling water pool on the back side, 4: reflective heat-resistant glass, 5: heat ray absorbing glass, 6: rubber stopper for bleeding air, 7: surveillance camera, 8: lens, 9 : Camera head movable head, 10: Sunshade cover.

Claims

In a camera case incorporating a camera that captures incident light,
Cooling means for cooling the camera case with a cooling medium,
A camera case, wherein the cooling means includes a cooling pool for storing the cooling medium.

In a camera case incorporating a camera that captures incident light,
A camera case comprising a heat-resistant coating on the outside of the camera case.

In a camera case incorporating a camera that captures light incident through the front glass,
A camera case, wherein the front glass has a double glass structure, and a space between the double glasses is simulated.