JPH07236077A - Protective case for video camera - Google Patents

Abstract

PURPOSE:To prevent freezing and dew condensation in a transparent member and to enable improved photographing by arranging a separate transparent member between the transparent member of a protective case and a photographing lens and turning a part between both transparent members to the sealed space of a low moisture content. CONSTITUTION:This protective case 1 holds a video camera BK inside by a protective member not shown in the Figure and the sealed space 2 is constituted between the protective case 1 and the video camera BK. Two sheets of glass bodies 4 and 5 which are the transparent members of the protective case 1 are arranged at a position in front of the photographing lens 6, the sealed space 7 is constituted between both glass bodies 4 and 5 as well and a drying agent 8 is arranged inside the sealed space 7. When an outside temperature is low, the outer side glass body 4 and a case main body 3 are immediately cooled. However, since the moisture content of the sealed space 7 is extremely low, steam does not stick to the outer side glass body 4. Also, the steam 11 generated in the sealed space 2 sticks to the case main body 3 of a low temperature and does not stick to the inner side glass body 5 whose temperature is higher than the case main body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective case for a video camera which covers the outer circumference of the video camera.

[0002]

2. Description of the Related Art When shooting in water, in rain, in cold regions, etc., the outer periphery of a video camera is often covered with a protective case for use. As shown in FIG. 3, the conventional protective case 1 is composed of a case body 3 made of plastic covering almost the entire outer circumference of the video camera BK and a glass body 4 arranged in front of the taking lens 6. The video camera BK is supported in the internal space of the protective case 1, and a closed space 2 is formed between the protective case 1 and the video camera BK.

[0003]

However, when the video camera BK equipped with the protective case 1 is used in cold regions, water, etc., if the outside temperature is low, the temperature inside the closed space 2 will be increased through the protective case 1. Also decreases. Then, since the saturated vapor pressure of the closed space 2 is lowered, as shown in FIG. 3, the water vapor 11 is attached to the glass body 4 having a better thermal conductivity than the case body 3. The attached water vapor 11 causes freezing and dew condensation, and the glass body 4 becomes cloudy, which causes a problem in photographing.

Therefore, it is an object of the present invention to provide a protective case for a video camera, which does not cause freezing or dew condensation due to water vapor on the translucent member and enables good shooting.

[0005]

A protective case for a video camera according to the present invention for attaining the above object seals an outer periphery of a video camera including at least a front part of a taking lens, and is provided at a position in front of the taking lens. In a video camera protective case in which a translucent member is disposed, another translucent member is disposed between the translucent member and the taking lens, and a sealed space having a low water vapor content rate is provided between the translucent members. It is composed of. Further, another light transmissive member is arranged between the light transmissive member and the photographing lens, a space between the both light transmissive members is configured as a closed space, and a desiccant is placed in the closed space. . Further, at least a part of the case main body other than the translucent member is made of a member having good thermal conductivity, and a cap capable of sealing the outer surface side of the translucent member is detachably provided. Furthermore, at least a part of the case main body other than the translucent member is made of a member having a high thermal conductivity, and a shutter member capable of sealing the outer periphery of the translucent member is provided so as to be openable and closable.

[0006]

When the video camera equipped with the protective case is used in water or the like, the protective case is cooled if the external temperature is low. The outer translucent member is cooled, but since the inner side is a closed space with a low water vapor content, no water vapor will adhere, and
Since this closed space has poor thermal conductivity, it is difficult for the light-transmitting member inside to have a low temperature. On the other hand, the case body itself tends to have a lower temperature than the inner translucent member, and water vapor is generated by cooling the inside of the case body. Does not adhere.

Further, when the cap or the shutter member is attached, the case body cools faster than the translucent member and water vapor is generated in the case body, and the water vapor adheres to the case body instead of the translucent member. Thus, if the cap is removed or the shutter is opened after the water vapor in the closed space is sufficiently reduced, the water vapor will no longer adhere to the translucent member.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows a first embodiment of the present invention. In FIG. 1A, the entire outer circumference of the video camera BK is covered with a protective case 1, and the protective case 1 is configured to be removable from the video camera BK.

The protective case 1 has an internal video camera B.
K is held by a protection member (not shown), and a closed space 2 is formed between the protection case 1 and the video camera BK.
The protective case 1 is composed of a plastic case body 3 and two glass members 4 and 5 which are attached to the case body 3 while maintaining airtightness.

The two glass bodies 4 and 5 are photographing lenses 6
It is placed in the front position of, and outside light is
The light passes through 5 and enters the taking lens 6. Further, the outer glass body 4 is exposed to the outside, and the space between the outer glass body 4 and the inner glass body 5 is also configured as a closed space 7. A desiccant 8 is placed in this closed space 7,
The closed space 7 is filled with air having a very low water vapor content. A communication hole 9 is provided between the closed air 7 and the above-described closed air 2, and the communication hole 9 is closed by a sealing plug 10. The desiccant 8 is put in and taken out by opening and closing the sealing plug 10.

In the above structure, when the video camera BK equipped with the protective case 1 is used in cold regions or underwater,
When the external temperature is low, the protective case 1, that is, the outer glass body 4 and the case body 3 are immediately cooled. Even if the outer glass body 4 is cooled, the inner space is the closed space 7 having a very low water vapor content, so that water vapor does not adhere to the outer glass body 4. In addition, since the thermal conductivity of air itself is very poor, the inner glass body 5 is unlikely to become a low temperature due to the influence of the low temperature of the outer glass body 4.

On the other hand, when the case body 3 is cooled, the enclosed space 2 inside the case body 3 is cooled, so that the case shown in FIG.
As shown in (a), water vapor 11 is generated. Then, the water vapor 11 adheres to the case body 3 having a low temperature, and does not adhere to the glass body 5 having a higher temperature than the case body 3.
Therefore, the two glass bodies 4 and 5 are not fogged due to the water vapor 11, and good photographing is possible.

In the first embodiment described above, the closed space 7 between the two glass bodies 4 and 5 is formed as a space having a low water vapor content by using the desiccant 8. 7, the closed space 7 may be filled with a gas having almost no water vapor content, or the closed space 7 may be sufficiently decompressed to form a space having a low water vapor content. Further, in the first embodiment, two glass bodies 4, 5
In the above, one closed space 7 is formed, but a plurality of glass bodies may form a plurality of closed spaces.

FIG. 1B shows a second embodiment of the present invention. In FIG. 1B, the entire outer circumference of the video camera BK is covered with a protective case 1, and the protective case 1 is a case body 3 and one light-transmissive member attached to the case body 3 in an airtight manner. And the cap 12 covering the outer peripheral side of the glass body 4.

The case body 3 has the same shape as that of the first embodiment, but unlike the first embodiment, it is a member (copper or aluminum material) having a higher thermal conductivity than the glass body 4. Is formed. The cap 12 is detachably provided on the outer peripheral portion of the glass body 4, and the outer surface side of the glass body 4 is hermetically sealed when the cap 12 is mounted.

In the above structure, when the video camera BK equipped with the protective case 1 is used in cold regions, underwater, etc.,
When the external temperature is low, the protective case 1, that is, the cap 12 and the case body 3 are immediately cooled. Even if the cap 12 is cooled, the inside of the cap 12 is an air layer having a low thermal conductivity, so that the glass body 4 is unlikely to become a low temperature. On the other hand, the case body 3
Is a member having a high thermal conductivity, so that the water vapor 11 is immediately generated and the hermetically closed space 2 inside thereof is also quickly cooled to generate water vapor 11 as shown in FIG. And
The water vapor 11 adheres to the low temperature case body 3 and does not adhere to the high temperature glass body 4 as compared with the case body 3.

After placing the video camera BK in a low temperature zero atmosphere for a while and then removing the cap 12, the glass body 4 is removed.
Is cooled immediately. However, since the water vapor 11 generated in the closed space 2 adheres to the case body 3 and the water vapor in the closed space 2 is sufficiently reduced, the water vapor 1
1 no longer adheres to the glass body 4. Therefore,
The glass body 4 is not fogged due to the water vapor 11, and good photographing is possible.

FIG. 2 shows a third embodiment of the present invention. In FIG. 2, in the third embodiment, a shutter member 13 is used instead of the cap 12 of the second embodiment. The shutter member 13 is detachably provided on the outer peripheral portion of the glass body 4, and the shutter plate 13b is opened and closed each time the operation button 13a is pressed. When the shutter plate 13b is in the closed position, the outer surface side of the glass body 4 is sealed, and when the shutter plate 13b is in the open position, the outer surface side of the glass body 4 is opened, and external light is incident on the taking lens 6 through the glass body 4. It Since the configuration other than the shutter member 13 is the same as that of the second embodiment, the same symbols are attached to the drawings and the description thereof is omitted.

Also in this third embodiment, the protective case 1
When the video camera BK equipped with is used in cold regions, underwater, etc., the shutter plate 13b is initially placed in the closed position, and after a while, the shutter plate 13b is switched to the open position, which is similar to the second embodiment. , The effect is obtained.

In the second and third embodiments, the case body 3 is entirely made of a material having a high thermal conductivity, but a part of the case body 3 is made of a material having a good thermal conductivity. You may.

In the first to third embodiments, the translucent member is composed of the glass bodies 4 and 5, but it may be composed of a plastic body. Although the protective case 1 is configured to cover the entire circumference of the video camera BK, it may be configured to cover a part of the video camera BK including the front position of the taking lens 6.

[0022]

As described above, according to the present invention, the transparent member is doubly arranged in front of the photographing lens of the protective case,
Since the space between the two translucent members is configured as a closed space with a low water vapor content, water vapor generated in the protective case does not adhere to the translucent member, so good shooting can be performed in cold regions, water, etc. There is an effect.

Further, according to the present invention, in the protective case having the case body and the light transmitting member, the case body is made of a member having a good thermal conductivity, and the outer surface of the light transmitting member can be sealed with a cap or Since the shutter member is detachably provided, water vapor generated in the protective case can be prevented from adhering to the translucent member, so that there is an effect that excellent photographing can be performed in cold regions, water, and the like.

[Brief description of drawings]

FIG. 1A is a sectional view of a main part showing a mounted state of a protective case of the first embodiment, and FIG. 1B is a sectional view of a main part showing a mounted state of a protective case of the second embodiment.

FIG. 2 is a sectional view of an essential part showing a mounted state of a protective case of a third embodiment.

FIG. 3 is a cross-sectional view of essential parts showing a mounted state of a protection case of a conventional example.

[Explanation of symbols]

 BK ... Video camera 1 ... Protective case 2, 7 ... Closed space 3 ... Case body 4, 5 ... Glass body (translucent member) 6 ... Photographing lens 8 ... Desiccant 12 ... Cap 13 ... Shutter member

Claims (4)

[Claims] 1. A protective case for a video camera, wherein at least an outer periphery of a video camera including a front side of a taking lens is hermetically sealed, and a translucent member is arranged in front of the taking lens, wherein the translucent member and the taking lens are provided. A protective case for a video camera, characterized in that another transparent member is disposed between the transparent member and the transparent member, and a space between the transparent members has a low water vapor content. 2. A protective case for a video camera, wherein at least an outer periphery of a video camera including a front side of the taking lens is hermetically sealed, and a translucent member is arranged in front of the taking lens, wherein the translucent member and the taking lens are provided. A protective case for a video camera, characterized in that another transparent member is arranged between the transparent member and the transparent member, a space is formed between the transparent members, and a desiccant is arranged in the sealed space. 3. A protective case for a video camera, wherein at least an outer periphery of a video camera including a front part of a taking lens is hermetically sealed, and a translucent member is arranged in front of the taking lens, wherein a case body other than the translucent member is provided. A protective case for a video camera, characterized in that at least a part thereof is made of a material having good thermal conductivity, and a cap capable of sealing the outer surface side of the light transmitting member is detachably provided. 4. A protective case for a video camera, wherein at least an outer periphery of a video camera including a front part of a taking lens is hermetically sealed, and a translucent member is arranged in a front position of the taking lens, wherein a case body other than the translucent member. A protective case for a video camera, characterized in that at least a part thereof is made of a material having a high thermal conductivity, and a shutter member capable of sealing the outer periphery of the light transmitting member is provided so as to be openable and closable.