JPH10285454A - Tv camera housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deteriorated image quality and a temperature rise in a housing by eliminating the effect given by rays other than visible lights. SOLUTION: A filter 18, consisting of an ultraviolet ray cut filter to prevent deteriorated image quality or a near-infrared ray cut filter to prevent the infiltration of thermal rays, is provided to an image-pickup window 16 which is provided to the television camera housing. A hard optical glass is plated to a front side of the filter 18 to prevent the filter 18 from being damaged through the operation of a wiper or the like or an air-tight space, in which a nitrogen gas is sealed or which is evacuated between the optical glass and the filter 18 to improve heat insulation and to prevent condensation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera housing, and more particularly, to a structure of a photographing window of a housing for housing a television camera for use outdoors.

[0002]

2. Description of the Related Art Conventionally, surveillance television cameras, outdoor relay television cameras, and the like have been used outdoors. Such a television camera is provided with a housing that completely wraps the outer periphery of the television camera and arranges a shooting window on the front side. Can be According to this housing, it is possible to protect the camera from rain, snow, and the like, and to protect dust and dust from affecting the photographing operation of the camera.

[0003]

However, a television camera using the above housing has a problem that light rays other than visible light affect the image quality or the operation of the camera. That is, in a shooting environment such as a surveillance camera, the amount of ultraviolet rays is large. When ultraviolet rays are incident from a shooting window, the quality of a captured image is degraded. When near-infrared rays are incident, the temperature in the housing is increased. If the temperature exceeds the use environment temperature, the camera cannot be used.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to remove the influence exerted by light other than visible light and to suppress a decrease in image quality or a rise in temperature in a housing. It is to provide a camera housing.

[0005]

According to a first aspect of the present invention, there is provided a television camera housing having a photographing window on a front surface for housing a television camera. A cut (ultraviolet absorption filter) filter or a near-infrared cut filter (infrared absorption or reflection filter) is provided. The invention according to a second aspect is characterized in that a hard optical glass is arranged on the photographing window in front of the ultraviolet cut filter or the near infrared cut filter. According to a third aspect of the present invention, the hard optical glass is coated with the ultraviolet cut filter or the near infrared cut filter on the inner surface thereof. According to a fourth aspect of the present invention, an airtight space is provided between the hard optical glass of the photographing window and the ultraviolet cut filter or the near infrared cut filter, and nitrogen gas is sealed in the airtight space, or the airtight space is provided. The interior is evacuated.

According to the first aspect of the present invention, ultraviolet rays are prevented from entering by the ultraviolet cut filter, so that deterioration of image quality is prevented, or near infrared rays (heat rays) are prevented from entering by the near infrared cut filter. As a result, the temperature inside the housing can be prevented from rising.

According to the second aspect, the hard optical glass is disposed on the outermost side. In a housing of this type of television camera, a wiper is arranged corresponding to rainfall, snowfall, and the like, and the wiper wipes the outer surface of the hard optical glass. Therefore, according to the hard optical glass, it is possible to prevent the inner ultraviolet cut filter or the near infrared cut filter from being damaged. According to the configuration of the fourth aspect, the presence of the nitrogen gas sealing or the vacuum hermetic space between the filter and the hard optical glass improves the heat insulating property and prevents dew condensation.

[0008]

1 and 2 show a television camera housing according to a first embodiment of the present invention. In FIG. 2, the television camera is used for monitoring and the like, and includes a camera body 10A and a lens unit 10B. The camera body 10A is attached to a camera platform 12 on the lower side. The camera platform 12 allows the lens section 10
B can be driven to pan and tilt. The housing 14-1 is attached so as to wrap and house the camera body 10A and the lens unit 10B.

FIG. 1 shows a cross section of the housing 14-1 and a television camera. As shown in FIG.
An imaging window 16 is formed in front of the lens unit 10A, and a filter 18 is attached to the imaging window 16. In this example, either an ultraviolet cut filter (ultraviolet absorption filter) or a near infrared cut filter (infrared absorption or reflection filter) is disposed as the filter 18.

According to the configuration of the first example, when an ultraviolet absorption filter is arranged as the filter 18, the ultraviolet light can be absorbed without affecting the visible light,
An image with good contrast can be obtained. In particular, the outdoor television camera according to the present invention for photographing outdoors with a lot of ultraviolet rays has a high effect of improving image quality.

When a near-infrared absorption (or reflection) filter is provided as the filter 18, it is possible to prevent near-infrared rays from penetrating without affecting visible light. Therefore, according to the filter 18, the heat rays are cut off, the temperature inside the housing 14-1 is prevented from rising, and the use of the camera within the use environment temperature of the television camera is further ensured.

FIG. 3 shows the structure of a second embodiment of the present invention. This second embodiment is provided with hard optical glass. That is, as shown in FIG.
The filter 18 and the hard optical glass 20 are provided on the photographing window 19 on the front side of the camera 2 so as to overlap with each other, and the optical glass 20 is disposed outside.

According to the configuration of the second example, the filter 1 is free from damage caused by the wiping operation of the wiper or the collision of flying objects or birds.
8 does not occur. That is, in the housing 14-2, although not shown, a wiper is arranged to enable photographing even during rainfall or snowfall, and the wiping operation of the wiper is performed on the surface of the optical glass 20. Therefore, the filter 18 is not damaged.
In addition, flying objects and birds may collide outdoors and are protected from such collisions.

FIG. 4 shows a configuration of a third example of the embodiment. This third example has a double window configuration. That is, as shown in FIG.
In the photographing window 21, a space member 22 is provided between the above-described filter 18 and the hard optical glass 20, and a space S is formed by this.
Attach these members.

The hermetic space S may be filled with nitrogen gas, or may be in a vacuum state or a state close thereto. According to the configuration of the third example, since a double window is formed by the optical glass 20 and the filter 18, the heat insulating property is improved, and the temperature rise in the housing 14 can be further prevented. In addition, it is possible to prevent dew condensation, and it is possible to satisfactorily remove obstacles in photography.

In the above-described embodiment, either an ultraviolet cut filter or a near infrared cut filter is disposed as the filter 18, but both may be disposed as an optical multilayer film or the like. Further, in the configuration shown in FIG. 3 or FIG. 4, an optical film of an ultraviolet cut filter may be coated on the inner surface of the optical glass 20 by means of vapor deposition or the like, and a near infrared cut filter may be disposed as the filter 18.
Conversely, it is also possible to coat the inner surface of the optical glass 20 with an optical film of a near-infrared cut filter and arrange an ultraviolet cut filter as the filter 18.

[0017]

As described above, according to the first aspect of the present invention, since the ultraviolet cut filter or the near infrared cut filter is disposed in the photographing window, the penetration of the ultraviolet rays into the housing is prevented. Prevent degradation of image quality,
Alternatively, a rise in the temperature inside the housing can be prevented by preventing the invasion of heat rays.

According to the second aspect of the present invention, since the hard optical glass is disposed in front of the ultraviolet cut filter or the near infrared cut filter, the filter can be protected from the wiping operation of the wiper or flying objects, etc. No damage to the filter. According to the third aspect of the invention, there is an effect that both cut filters can be efficiently arranged.

According to the fourth aspect of the present invention, since an airtight space is provided between the hard optical glass and the filter, there is an advantage that heat insulation is improved and dew condensation can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a television camera housing according to a first example of an embodiment of the present invention.

FIG. 2 is a perspective view showing the entire configuration of a television camera housing of the embodiment.

FIG. 3 is a cross-sectional view illustrating a configuration of a second example of the embodiment.

FIG. 4 is a cross-sectional view illustrating a configuration of a third example of the embodiment.

[Explanation of symbols]

 10A: Camera body, 10B: Lens part, 14-1, 14-2, 14-3: Housing, 16: Photographing window, 18: Filter, 20: Optical glass, S: Airtight space.

Claims (4)

[Claims] 1. A television camera housing having a photographing window on a front surface for accommodating a television camera, wherein an ultraviolet cut filter or a near infrared cut filter is arranged in the photographing window. 2. The television camera housing according to claim 1, wherein a hard optical glass is disposed in front of the ultraviolet cut filter or the near infrared cut filter in the photographing window. 3. The television camera housing according to claim 2, wherein the ultraviolet cut filter or the near infrared cut filter is coated on an inner surface of the hard optical glass. 4. An airtight space is provided between the hard optical glass of the photographing window and the ultraviolet cut filter or the near infrared cut filter, and nitrogen gas is sealed in the airtight space, or a vacuum is formed in the airtight space. The television camera housing according to claim 2, wherein: