JP2766455B2 - TV camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera for outputting a video signal by photoelectrically converting an optical image of a subject formed by a photographic lens and using a camera cover to provide functions such as drip-proof, splash-proof, and dust-proof. Technology that gives

[0002]

2. Description of the Related Art In a conventional large television camera for a studio, a photographic lens is covered with a fixed cover 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 used with the cover always attached. However, for example, in the case of a shoulder-type television camera used by a photographer on the shoulder, such a fixed cover is not generally provided, and a cover is provided for each television camera including a taking lens depending on the use environment. To use. Therefore, this cover has a simple configuration that can be easily attached to and detached from the television camera. For example, as shown in FIG. 1, a cover 1 made of a synthetic resin having an open bottom is placed over the television camera 2. In general, the shooting lens 3 of the TV camera 2
Protrudes from the camera body, the cover 1 is integrally formed with a first cylindrical portion 4 covering the taking lens, and the viewfinder 5 also protrudes from the camera body. Are formed integrally with each other. Strings 7 and 8 are passed through the open ends of the first and second cylindrical portions 4 and 6, and the photographing lens 3
And can be fixed to the viewfinder 5.

FIG. 2 shows another example of a cover for a television camera. The cover 11 is also made of synthetic resin and is formed in a substantially box shape with an open lower portion.
An opening 12 is formed in a portion where the taking lens 3 protrudes, and a fixing band 13 made of a magic tape is provided below the opening. Further, a cylindrical portion 14 that covers the viewfinder 5 of the television camera 2 is formed, and its open end can be fixed to the viewfinder with a cord 15.

[0004]

When the above-mentioned cover 1 is mounted on the television camera 2 and used, the first cylindrical portion 4 is put on the photographing lens 3 of the television camera 2 and the cord 7 is pulled. The opening of the part is narrowed and fixed. Here, a hood 9 is attached to the photographing lens 3 as shown in FIG. 3, and the string 7 is fastened at the hood. The hood 9 is generally made of rubber or plastic, and has a smooth surface and a conical or pyramid shape. Therefore, it is difficult to fix the string 7 and there is a possibility that the string 7 is shifted during use, and a gap is generated when the string 7 is shifted. Furthermore, wrinkles occur because the cord 7 narrows the opening of the cylindrical portion 4 of the cover. This wrinkle causes a slight gap. There is a drawback that water or dust enters the inside from outside through these gaps.

When the cover 11 shown in FIG. 2 is used, the cover is placed so that the hood 9 of the television camera projects from the opening 12 as shown in FIG. 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 from this gap. In particular, when such a type of cover is combined with an interchangeable lens type TV camera, the size of the opening 12 needs to be increased according to the largest lens hood, so when using a lens with a small hood, There is a possibility that a relatively large gap is formed between the opening 12 of the cover 11 and the hood 9.

As described above, the conventional television camera has a disadvantage that a gap is formed between the cover and the hood 9 of the photographing lens 3 and water or dust enters the inside from the gap. In particular, a movable ring for focus adjustment and a movable ring for magnification adjustment are provided on the lens barrel of the photographing lens 3, and since this portion does not have a drip-proof or splash-proof structure, as described above, There is a serious disadvantage that when water enters the lens, water enters the interior of the lens from these rings. Also,
In order to solve such a defect, it is conceivable to cover with the cover including the photographing lens 3. However, the subject image formed by the photographing lens because the front part of the lens becomes cloudy, dirty, or wrinkled. May be significantly deteriorated and may not be practically used. In addition, there is a case for underwater camera as a case that covers the entire TV camera,
The disadvantages of soiling cannot be eliminated, and the structure is complicated and expensive. In addition, the usability of the TV camera becomes very poor, and it is not practical.

An object of the present invention is to provide a television camera capable of effectively eliminating the above-mentioned disadvantages of the related art with a simple configuration.

A television camera according to the present invention is a television camera for outputting a video signal by photoelectrically converting an optical image of a subject formed by a photographing lens, wherein water droplets are formed on the lens barrel of the photographing lens or its lens hood. Alternatively, a flange is provided to prevent the lens from entering the camera body through the surface of the lens hood, and the opening end of the cylindrical lens cover portion of the camera cover is provided with an opening so as not to disturb the field of view of the taking lens. It is characterized in that it can be fixed at the position of the flange. The flange may be formed integrally with the lens barrel or lens hood of the photographing lens, or may be formed on a member attached to the lens barrel or lens hood of the photographing lens. In the latter case, it is preferable that the member having the flange is fixed to the television camera by means for attaching a lens hood to the lens barrel. Further, a television camera of the present invention is a television camera which photoelectrically converts an optical image of a subject formed by a photographing lens and outputs a video signal, wherein water droplets are formed on the lens barrel of the photographing lens or its lens hood. A groove is provided to prevent the light from traveling along the surface of the lens hood and entering the camera body, and the opening end of the cylindrical lens cover portion of the camera cover is provided so as not to disturb the field of view of the taking lens. In such a manner as to be able to be fixed at the position. Furthermore, in the television camera according to the present invention, the television camera is formed in a shoulder 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, and a plurality of photographing lenses having different dimensions, shapes, and performances are provided. It is preferable to use a lens exchange type that can be exchanged for the camera body.

[0009]

In the above-described television camera according to the present invention, the lens barrel or lens hood of the photographing lens is provided with a flange or a groove for preventing water droplets from penetrating into the camera body through these surfaces. Since the opening end of the lens cover portion is fixed at the position of the flange or the groove, water and dust hardly enter the camera body from the gap between the lens cover portion and the lens.
When such a flange or groove is formed integrally with the lens barrel or lens hood, the structure becomes very simple. Also,
When a member having a flange or a groove is attached to a lens or a hood, an existing photographing lens can be used as it is.

[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 for the television camera body and the cover as they are. In this example, the taking lens 3
A groove 21 is formed on the outer surface of the hood 9 of FIG. The cross-sectional shape of the groove 21 is substantially semicircular, so that the cord 7 provided at the opening end of the cylindrical portion 4 of the cover can enter the groove. When raindrops fall from the outside of the cover, even if there is a slight gap due to wrinkles caused by narrowing the tubular portion 4 of the cover with the string 7, water falls down along the groove of the hood and falls down along the string 7 and falls down. The lens can be effectively prevented from getting wet by dropping into the camera or falling out from the bottom of the camera cover. Further, since the string 7 does not slip down from the groove 21, there is no possibility that a gap is formed between the cover and the lens 3 during use.

FIG. 6 shows the configuration of a second embodiment of the television camera according to the present invention. In this embodiment, the cover shown in FIG. 2 is applied. In this example, a flange 22 is integrally formed on the outer peripheral surface of the hood 9 of the photographing lens 3. In this case, the opening 12 of the cover 11 is
By covering the cover so as to be positioned outside the space, 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 along the flange and fall from the lower part of the cover. Therefore, there is no possibility that water will enter the inside beyond the flange.

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. Can not. However, as shown in FIG.
When forming 22, the cover 1 shown in FIG. 1 as well as the cover 11 shown in FIG. 2 can be used. Of course, when the latter cover 1 is used, the string 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. However, the present invention is not limited to such a configuration, and various changes and modifications are possible. For example, the grooves and flanges can be formed integrally with the lens barrel instead of the lens hood. Further, instead of integrally forming the groove and the flange on the hood and the lens barrel, a member having the groove and the flange can be attached to the taking lens. With this configuration, it can be easily applied to an existing photographing 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 by using a screw 33 for fixing the hood 9 to the lens barrel of the taking lens 3. This shows a third embodiment of the present invention. A cylindrical portion 9a is formed at the base of the hood 9 made of rubber or plastic so as to correspond to the outer peripheral shape of the lens barrel of the photographing lens 3.
A metal ring 34 is fitted on the outside of the cylindrical portion, and a screw hole is formed in the ring.
33 is screwed. Therefore, the hood 9 can be fixed to the lens 3 by adjusting the screw 33.
In the present invention, a metal or plastic ring 31 is integrally provided outside the above-described metal ring. Therefore, the flange 32 can be attached by the operation of attaching the hood 9 to the photographing lens 3.

FIG. 8 shows a fourth embodiment of the television camera according to the present invention.
9 shows a configuration of a flange attachment member of the embodiment. In this example, a ring 41 in which a flange 42 is integrally formed
Form a split in one place, and projecting pieces on both sides of this split
43a and 43b are formed, and these protruding pieces can be connected by screws 44. That is, after opening the split and passing the lens barrel through the ring 41, the screw can be tightened to attach the flange.

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

[0017]

As described above, in the television camera according to the present invention, a groove or a flange is formed in the lens barrel or hood of the photographing lens of the television camera, or a member having the groove or the flange is attached to the photographing lens. Accordingly, no gap is formed between the cover and the lens barrel or the hood, so that water and dust can be effectively prevented from entering the inside. Further, when a flange is formed, even if a gap is formed, water does not intrude beyond the flange. Further, in an embodiment in which a member having a groove or a flange is attached to a taking lens, the present invention can be applied to an existing television camera. Further, when the present invention is applied to an interchangeable lens type television camera that can use various lenses having different sizes and shapes, even if the lens is exchanged, water or dust may enter from the gap between the cover and the lens or the hood. It is possible to effectively prevent intrusion into the inside. Therefore, the effect of the present invention is most effectively exerted even in a television camera of a shoulder type and an interchangeable lens type.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a conventional television camera cover.

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

FIG. 3 is a view showing a conventional television camera equipped with the cover shown in FIG. 1;

FIG. 4 is a view showing a conventional television camera equipped with the cover shown in FIG. 2;

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 Shooting Lens 4 Lens Cover 7 Fixing Cord 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 Protrusion 44 screw

Claims (7)

(57) [Claims] 1. A television camera for outputting a video signal by photoelectrically converting an optical image of a subject formed by a photographic lens and outputting a video signal to the lens barrel of the photographic lens or its lens hood. A flange is provided to prevent the
A television camera characterized in that an opening end of a cylindrical lens cover portion provided with an opening so as not to disturb the field of view of a photographing lens of the camera cover can be fixed at the position of the flange. 2. The television camera according to claim 1, wherein the flange is formed integrally with a lens barrel or a lens hood of the photographing lens. 3. The television camera according to claim 1, wherein the flange is formed on a member attached to a lens barrel or a lens hood of the photographing lens. 4. The television camera according to claim 3, wherein the member having the flange is fixed by means for attaching a lens hood to a lens barrel. 5. A television camera for outputting a video signal by photoelectrically converting an optical image of a subject formed by a photographing lens, wherein water droplets are formed on the lens barrel of the photographing lens or its lens hood. The opening end of the cylindrical lens cover part provided with an opening so as not to obstruct the field of view of the taking lens of the camera cover is fixed at the position of the groove. A television camera characterized in that the television camera is configured to be able to perform the operation. 6. The television camera according to claim 1, wherein the television camera is formed in a shoulder 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. 7. The television camera according to claim 6, wherein the television camera is a lens interchangeable type in which a plurality of photographing lenses having different dimensions, shapes, and performances can be exchanged for a camera body.