JPH0879583A - TV camera - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent water and dust from entering the inside of the cover that is detachably attached to the TV camera. [Structure] A groove 21 or a flange 22 is formed on the outer peripheral surface of the hood 9 of the taking lens 3 of the television camera 2, and the lens cover portion 4 or the opening 12 of the cover is fixed at this position, and the gap between the cover and the lens is fixed. The structure will prevent water and dust from entering through the gap. Rings 31 and 41 having grooves and flanges 32 and 42 may be attached to the lens barrel or hood of the taking lens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera which photoelectrically converts an optical image of a subject formed by a photographing lens and outputs a video signal, and has functions such as drip-proof, splash-proof and dust-proof using a camera cover. It is related to the technology of giving.

[0002]

2. Description of the Related Art In a conventional large television camera for a studio, a taking lens is covered with a fixed cover in order to provide functions such as drip-proof, splash-proof and dust-proof. That is, the cover is fixedly attached to the taking lens, and the television camera is always used with the cover attached. However, for example, in the case of a shoulder-mounted TV camera that the photographer carries on his / her shoulder, such a fixed cover is not generally provided, and a cover is attached to each TV camera including the taking lens according to the usage environment. I am trying to use it. Therefore, this cover has a simple structure that can be easily attached to and detached from the television camera. For example, as shown in FIG. 1, a television camera 2 is covered with a synthetic resin cover 1 having an open bottom. Generally, the taking lens 3 of the TV camera 2
Since it projects from the camera body, the cover 1 is integrally formed with the first cylindrical portion 4 that covers this photographing lens, and the viewfinder 5 also projects from the camera body, so that the second portion that covers this portion is formed. The tubular portion 6 is integrally formed. Strings 7 and 8 are passed through the open ends of the first and second tubular portions 4 and 6, and the photographing lens 3
Also, it can be fixed to the viewfinder 5.

FIG. 2 shows another example of a cover for a television camera. This cover 11 is also made of synthetic resin and is formed in a substantially box shape with an open lower part.
An opening 12 is formed in the portion where the taking lens 3 projects, and a fixing band 13 made of Velcro is provided below the opening. Further, a tubular portion 14 is formed to cover the viewfinder 5 of the television camera 2, and the open end of the tubular portion 14 can be fixed to the viewfinder with a string 15.

[0004]

When the above-described cover 1 is used by mounting it on the television camera 2, the first tubular portion 4 is put on the taking lens 3 of the television camera 2 and the string 7 is pulled to form a tubular shape. The opening of the part is narrowed and fixed. Here, a hood 9 is attached to the taking lens 3 as shown in FIG. 3, and the string 7 is fastened at this hood portion. The hood 9 is generally made of rubber or plastic, and its surface is smooth and has a conical or pyramidal shape. Therefore, it is difficult to fix the string 7, and there is a possibility that it will shift during use, and if it shifts, a gap will occur. Furthermore, wrinkles occur because the string 7 narrows the opening of the tubular portion 4 of the cover. This wrinkle causes a slight gap. There is a drawback that water or dust may enter from the outside through these gaps.

When the cover 11 shown in FIG. 2 is used, as shown in FIG. 4, the cover 9 is covered so that the hood 9 of the television camera projects from the opening 12, and the mounting band 13 is connected. Although it is fixed, there is still a gap between the opening 12 of the cover 11 and the hood 9, and there is a drawback that water and dust enter the inside through this gap. In particular, when a cover of this type is combined with an interchangeable lens type TV camera, the size of the opening 12 must be increased to match the largest lens hood, so when using a lens with a small hood, A relatively large gap may be formed between the opening 12 of the cover 11 and the hood 9.

As described above, in the conventional television camera, there is a defect that a gap is formed between the cover and the hood 9 of the taking lens 3 and water and dust enter from the gap. In particular, the lens barrel of the taking lens 3 is provided with a movable ring for focus adjustment and a movable ring for magnification adjustment, and this portion does not have a drip-proof or splash-proof structure. The intrusion of water through the ring has the serious drawback of intruding water into the lens from these rings. Also,
In order to eliminate such a defect, it is possible to cover the photographing lens 3 with a cover, but the subject image formed by the photographing lens due to clouding, dirt, or wrinkles on the front surface of the lens. May deteriorate significantly and become unusable for practical use. In addition, there is a case for underwater camera as a case that covers the whole TV camera,
The drawback of becoming dirty is not eliminated, and the structure is complicated and expensive. In addition, the usability of the TV camera is very poor, and it is not practical.

An object of the present invention is to provide a television camera which can effectively eliminate the above-mentioned conventional drawbacks with a simple structure.

[0008]

SUMMARY OF THE INVENTION The present invention is a television camera for photoelectrically converting an optical image of an object formed by a taking lens to output a video signal, in which a groove or a lens hood of the taking lens is provided. It is characterized in that a flange is provided so that the lens cover portion of the camera cover can be fixed at the position of this groove or can be covered so as to close the gap at the position of the flange. In a preferred embodiment of the television camera according to the present invention, the groove or flange is formed integrally with the lens barrel or lens hood of the taking lens, or is formed in a member attached to the lens barrel or lens hood of the taking lens. . Further, in a preferred embodiment of the television camera according to the present invention, a plurality of taking lenses having different sizes, shapes and performances are formed by shoulder-hanging shape in which a curved portion having a shape corresponding to a user's shoulder is formed on the bottom surface of the camera body. Is an interchangeable lens type that is interchangeable with the camera body.

[0009]

In the above-described television camera according to the present invention, since the opening of the lens cover portion that covers the taking lens is fixed at the position of the groove or the flange, water or water can be drawn from the gap between the lens cover portion and the lens. Dust becomes difficult to enter inside. When such a groove or flange is formed integrally with the lens barrel or the hood, the structure becomes very simple. Further, when a member having a groove or a flange is attached to a lens or a hood, it can be applied as it is to an existing taking lens.

[0010]

FIG. 5 is a diagram showing the structure of a first embodiment of a television camera according to the present invention, which can be applied to the cover shown in FIG. Therefore, the reference numerals used in FIG. 1 are used as they are for the television camera body and the cover. In this example, the taking lens 3
The groove 21 is formed on the outer surface of the hood 9. The groove 21 has a substantially semicircular cross section so that the cord 7 provided at the open end of the tubular portion 4 of the cover can enter therein. If raindrops are applied from the outside of the cover, the water will flow down the groove of the hood and down through the groove of the hood even if there is a small gap due to the wrinkles caused by narrowing the tubular portion 4 of the cover with the string 7. The lens can be effectively prevented from getting wet with water because it falls into or out of the bottom of the camera cover. Further, since the string 7 does not slide down from the groove 21, there is no fear that a gap is formed between the cover and the lens 3 during use.

FIG. 6 shows the configuration of the second embodiment of the television camera according to the present invention, and the cover shown in FIG. 2 is applied to this example. In this example, a flange 22 is integrally formed on the outer peripheral surface of the hood 9 of the taking lens 3. In this case, the opening 12 of the cover 11 is
By covering the cover so that it is located on the outside of the lens, the gap between the opening 12 and the lens hood 9 can be closed, and water and dust can be effectively prevented from entering the inside. In this embodiment, even if a gap is formed between the opening 12 of the cover 11 and the hood 9 or the flange 22, raindrops applied from the outside of the cover are transmitted downward through the flange and fall out from the lower portion of the cover. Therefore, there is no possibility that water will pass through the flange and enter the inside.

When the groove 21 is formed in the hood 9 as in the first embodiment shown in FIG. 5, the cover 1 shown in FIG. 1 can be used, but the cover 11 shown in FIG. 2 must be used. I can't. However, as shown in FIG. 6, the hood 9 has a flange.
When forming 22, the cover 1 shown in FIG. 1 can be used in addition to the cover 11 shown in FIG. Of course, when the latter cover 1 is used, the cord 7 is fixed outside the flange 22.

In the above-described embodiment, the groove 21 or the flange 22 is formed in the lens hood itself, but the present invention is not limited to such a configuration, and many modifications and variations are possible. For example, the groove and the flange may be formed integrally with the lens barrel instead of the lens hood. Further, instead of integrally forming the groove or the flange on the hood or the lens barrel, a member having the groove or the flange can be attached to the taking lens. With this configuration, it can be easily applied to an existing taking lens.

FIG. 7 shows a television camera according to the present invention in which a ring 31 integrally formed with a flange 32 is fixed together with a screw 33 for fixing the hood 9 to the lens barrel of the taking lens 3. Is a third embodiment of the present invention. At the base of the hood 9 made of rubber or plastic, a cylindrical portion 9a is formed so as to correspond to the outer peripheral shape of the lens barrel of the taking lens 3.
Is formed, and a metal ring 34 is fitted on the outer side of this cylindrical portion, and a screw is formed in the screw hole formed in this ring.
33 is screwed. Therefore, the hood 9 can be fixed to the lens 3 by adjusting the screw 33.
In the present invention, the metal or plastic ring 31 is integrally provided on the outer side of the metal ring 34 described above. Therefore, the flange 32 can be attached by the work of attaching the hood 9 to the taking lens 3.

FIG. 8 shows a fourth embodiment of the television camera according to the present invention.
The structure of the flange mounting member of the embodiment of FIG. In this example, a ring 41 having a flange 42 integrally formed therein is used.
A split is formed in one place, and protrusions are provided on both sides of this split.
43a and 43b are formed so that these protrusions can be connected by a screw 44. That is, the flange 42 can be attached by opening the slit and passing the lens barrel through the ring 41, and then tightening the screw 44.

In the above-described third and fourth embodiments, the member having the flange is attached to the taking lens, but the member having the groove may be attached to the taking lens.

[0017]

As described above, in the television camera according to the present invention, the groove or flange is formed in the lens barrel or the hood of the taking lens of the television camera, or the member having the groove or flange is attached to the taking lens. As a result, no gap is formed between the cover and the lens barrel or the hood, and therefore water and dust can be effectively prevented from entering the inside. Further, in the case of forming the flange, water does not pass through the flange and enter the inside even if a gap is formed. Further, the embodiment in which the member having the groove or the flange is attached to the photographing lens can be applied to the existing television camera. In addition, when the present invention is applied to a lens-interchangeable television camera that can use various lenses having different sizes and shapes, even if the lens is exchanged, water and dust will not get out of the gap between the cover and the lens or the hood. It is possible to effectively prevent the intrusion. Therefore, the effect of the present invention is most effectively exerted even in the television camera of the shoulder type and the interchangeable lens type.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a conventional TV camera cover.

FIG. 2 is a diagram showing another example of a conventional TV camera cover.

FIG. 3 is a view showing a conventional television camera equipped with the cover shown in FIG.

FIG. 4 is a diagram showing a conventional television camera equipped with the cover shown in FIG.

FIG. 5 is a diagram showing a first embodiment of a television camera according to the present invention.

FIG. 6 is a diagram showing a second embodiment according to the present invention.

FIG. 7 is a diagram showing a third embodiment according to the present invention.

FIG. 8 is a diagram showing a fourth embodiment according to the present invention.

[Explanation of symbols]

 1 TV camera 2 Cover 3 Photographic lens 4 Lens cover 7 Fixing string 9 Hood 11 Cover 12 Opening 13 Fixing tape 21 Groove 22 Flange 31 Ring 32 Flange 33 Screw 34 Ring 41 Ring 42 Flange 43a, 43b Projection piece 44 screw

Claims (6)

[Claims] 1. A television camera for photoelectrically converting an optical image of a subject formed by a taking lens and outputting a video signal, wherein a groove or a flange is provided in a lens barrel of the taking lens or a lens hood thereof, and a lens of a camera cover is provided. A television camera characterized in that the cover portion can be fixed at the position of the groove or the flange. 2. The television camera according to claim 1, wherein the groove or the flange is formed integrally with a lens barrel or a lens hood of the taking lens. 3. The television camera according to claim 1, wherein the groove or the flange is formed in a member attached to a lens barrel or a lens hood of the taking lens. 4. The television camera according to claim 3, wherein the member in which the groove or the flange is formed is fixed by means for attaching a hood to the lens barrel. 5. The television camera according to claim 1, wherein the television camera has a shoulder-hanging shape in which a curved portion having a shape corresponding to a user's shoulder is formed on a bottom surface of the camera body. TV camera. 6. The television camera according to claim 5, wherein the television camera is a lens exchange type in which a plurality of photographing lenses having different sizes, shapes and performances can be exchanged with respect to the camera body.