JP4240246B2 - Camera device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera device in which a camera body is housed in a case.
[0002]
[Prior art]
Conventionally, for example, in a road, a river, or a public facility, a camera device such as a surveillance camera or a security camera that is mainly installed in an environment exposed to outdoor wind and rain is described in JP-A-9-230493. Yes. That is, the camera body is housed in a case having a substantially rectangular frame shape that is elongated in the direction of the optical axis, and a transparent front glass that faces the lens of the camera body is provided on one end surface in the longitudinal direction of the case.
[0003]
The outer surface of this front glass is easily soiled by dust, exhaust gas, rainwater, etc. in the atmosphere. This dirt impairs the translucency, and the image taken with the camera body is dark, blurred, distorted, distorted, etc. Cause a decline.
[0004]
Further, when water droplets such as rainwater adhere to the outer surface of the front glass, it is difficult to see an image photographed by the camera body due to the water droplets, and it is difficult to recognize the image.
[0005]
Since such camera devices are often installed at high places and cannot be easily maintained, an electric wiper is installed on the outer surface of the front glass to remove dirt and water drops, or the outer surface of the front glass In addition, a photocatalytic film is formed to decompose and remove dirt by its catalytic action, and water droplets can easily flow by its hydrophilic action.
[0006]
[Problems to be solved by the invention]
However, since the conventional camera device includes a case having a substantially rectangular frame shape that is elongated in the optical axis direction of the camera body, it is easily recognized as a surveillance camera or a security camera due to its shape. There are problems such as making them conscious and damaging the landscape. In addition, there is a problem that the inside of the case is clouded due to a change in the outside air temperature, making it difficult to obtain a clear image, and that the catalytic action by the photocatalytic film is not actively activated.
[0007]
It is an object of the present invention to provide a camera device that makes it difficult to fog the inside of the camera device and activates the catalytic action of the photocatalytic film to obtain a clear image.
[0008]
[Means for achieving the object]
According to the first aspect of the present invention, there is provided a case having an upper cover and a lower cover that has a translucent portion at least in part and is formed in a substantially hemispherical shape; A camera body; a photocatalyst film formed on at least the outer surface of the light transmitting portion of the lower cover; and disposed along the lower side and both sides of the camera body on the rear side of the lens of the camera body and formed in a substantially U shape And a light source capable of irradiating infrared rays and ultraviolet rays disposed between the camera body and the photocatalyst film.
[0009]
According to a second aspect of the present invention, in the camera device according to the first aspect, the photocatalytic film is a visible light transmitting and ultraviolet absorbing film.
[0010]
According to the first and second aspects of the present invention, the inside of the camera device is hardly fogged and the catalytic action by the photocatalytic film can be activated, so that a clear image can be obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0012]
1 is a side view of the camera device with a part cut away, FIG. 2 is also a front view, FIG. 3 is a bottom view, FIG. 4 is a characteristic diagram of spectral transmittance of a photocatalyst film, and FIG. FIG. 6 is a characteristic diagram of spectral sensitivity with respect to an input light wavelength of a color CCD.
[0013]
In the figure, the camera device has a camera device main body 1, and the camera device main body 1 is attached to a pole 3 installed on the ground, an outer wall of a building, or the like via a mounting bracket 2.
[0014]
The camera apparatus body 1 has a case 11, and the case 11 has an upper cover 12 and a lower cover 13, and the upper cover 12 and the lower cover 13 are sealed from each other via an upper ring 14 and a lower ring 15, respectively. Combined with the state, it is formed in a substantially spherical shape.
[0015]
The upper cover 12 is made of, for example, metal and is formed in a substantially hemispherical shape. A flat mounting portion 21 is formed on the upper portion of the mounting cover 2 by screwing, and a flange portion 22 is formed on the peripheral portion. The part 22 is fixed to the upper surface of the upper ring 14 with screws.
[0016]
The lower cover 13 is made of a translucent resin such as acrylic, and is formed in a substantially hemispherical shape. That is, the entire surface of the lower cover 13 is configured as the light transmitting portion 23. A flange portion 24 is formed on the peripheral edge of the lower cover 13, and is fixed to the upper surface of the lower ring 15 of the flange portion 24 with screws.
[0017]
A titanium oxide (Ti02) photocatalytic film is formed on the outer surface of the lower cover 13 by, for example, applying a titanium alkoxide solution by dipping or the like, or by physical vapor deposition (PVD) such as vacuum deposition. Has been.
[0018]
This photocatalyst film is, for example, a visible light transmitting film having a wavelength of 400 nm or more and an ultraviolet absorbing film having a film thickness of 400 nm or less, and has a visible light transmittance corresponding to a wavelength with a high sensitivity of a CCD, which will be described later. That is, FIG. 4 shows a characteristic diagram of spectral transmittance when the thickness of the photocatalyst film is changed when the light beam applied to the photocatalyst film is constant. Because there is a characteristic that the transmittance decreases due to absorption,
By forming the film thickness of the photocatalyst film within an appropriate range, a sufficient photocatalytic action can be obtained and a decrease in visible light transmittance can be suppressed.
[0019]
Further, as shown in FIG. 5 or FIG. 6 to be described later, the spectral sensitivity characteristic graph with respect to the input light length of the CCD, the transmission wavelength of the photocatalyst film corresponds to visible light of 400 nm or more which is a wavelength with good sensitivity of the CCD. By setting this, a sufficient photocatalytic action can be obtained, and a decrease in visible light transmittance can be suppressed. In addition, when the material of the lower cover 13 is made of, for example, soda lime glass, a photocatalytic film is formed through an intermediate layer (undercoat) mainly composed of silica (Si02), and impurities precipitated from the soda lime glass. It is possible to prevent the photocatalytic film from being deteriorated by alkali components such as sodium and sodium (Na). A photocatalytic film may also be formed on the inner surface of the lower cover 13.
[0020]
The upper ring 14 and the lower ring 15 are made of, for example, a resin and are annularly engaged with each other, and are detachably engaged and fixed with screws. Between the upper ring 14 and the upper cover 12 and the lower cover 13, an annular packing 25 is disposed over the entire circumference, and the space between them is sealed.
[0021]
A flange portion 26 is formed along the peripheral edge of the upper ring 14 so as to project around the case 11. The flange portion 26 is formed in a concave groove shape on the upper surface of the peripheral edge of the upper ring 14, and a drainage groove 27 communicating with the peripheral surface of the upper ring 14 is cut out at one location corresponding to a predetermined drainage direction. This predetermined drainage direction corresponds to the direction of the pole 3.
[0022]
A camera body 31 and a camera cover 32 are housed in the case 11. The camera body 31 has a CCD (not shown) as an image sensor, and a lens 33 is disposed in front of the CCD. An image to be photographed is formed on the CCD through the lens 33 and converted into an electrical signal. A camera cord 34 is connected to the rear part of the camera body 31. FIG. 5 is a characteristic diagram of spectral sensitivity with respect to the input light wavelength of the monochrome CCD, and FIG. 6 is a characteristic diagram of spectral sensitivity with respect to the input light wavelength of the color CCD. In any case, the sensitivity is good at a wavelength range of visible light of 400 nm or more.
[0023]
The camera body 31 is supported by a support mechanism 35 so that the photographing direction can be changed. The support mechanism 35 has mounting bases 37 on both sides that rotatably support both sides of the camera body 31 via a rotating shaft 36, and the mounting base 37 is attached to the lower surface of the upper ring 14. It is supported by. The turntable 38 is attached with a plurality of attachment screws 40 to a plurality of attachment grooves 39 formed in an arc shape on the lower surface of the upper ring 14, and rotates according to the screwing position of the attachment screws 40 with respect to the attachment grooves 39. The position can be adjusted, and the camera apparatus body 1 is attached in an inclined state in advance so as to be in a horizontal state in an installation posture described later.
[0024]
A bracket 41 is attached to the camera body 31, and a light source 43 capable of irradiating infrared rays and ultraviolet rays as a light source such as a cold cathode lamp is detachably attached to the bracket 41 via a plurality of lamp holders 42. ing. The infrared / ultraviolet lamp 43 is formed in a substantially U shape arranged along the periphery, that is, the lower side and both sides of the camera body 31 between the camera body and the photocatalyst film, and is arranged on the rear side of the front surface of the lens 33. Has been.
[0025]
The camera cover 32 functions as a light shielding member, and is made of, for example, a metal and is formed in a substantially hemispherical shape that is substantially concentric with the lower cover 13, and has a band shape corresponding to the range of the photographing direction in the vertical direction of the camera body 31. A notch 45 is formed. A flange 46 is formed on the peripheral edge of the camera cover 32, and the flange 46 is attached to the lower surface of the upper ring 14.
[0026]
The flange portion 46 is attached to a plurality of mounting grooves 47 formed in an arc shape on the lower surface of the upper ring 14 with a plurality of mounting screws 48, and rotates according to a screwing position of the mounting screws 48 with respect to the mounting grooves 47. The position can be adjusted, and the camera apparatus body 1 is attached in an inclined state in advance so as to be in a horizontal state in an installation posture described later.
[0027]
Thus, in the installation state in which the camera device body 1 is attached to the pole 3 via the mounting bracket 2, the vertical center axis S of the camera device body 1 is inclined at a predetermined angle with respect to the vertical line from the ground surface. . That is, the pole 3 side of the joint surface between the upper cover 12 and the lower cover 13 is inclined downward, and the side opposite to the pole 3 is inclined upward. And the drainage groove 27 is arrange | positioned at the pole 3 side, and the collar part 26 is inclined downward toward the drainage groove 27 which is a drainage direction.
[0028]
The shooting direction of the camera body 31 is adjusted by setting the vertical direction by rotating the camera body 31 about the rotation shaft 36, and horizontal by rotating the turntable 38 relative to the upper ring 14. The direction is adjusted and set. When the horizontal orientation of the camera body 31 is adjusted and set, the camera cover 32 is integrally rotated to keep the positional relationship with the camera body 31 constant.
[0029]
An image photographed through the lower cover 13 is formed on the CCD of the camera main body 31 by the lens 33 and converted into an electric signal, and the electric signal is transmitted through the camera code 34 and displayed on a monitor or the like.
[0030]
And since the camera apparatus formed the peripheral surface shape of the lower cover 13 of the case 11 into a substantially hemispherical shape, and the case 11 as a whole was formed into a substantially spherical shape, the camera body 31 was housed in the case 11. Without being aware of the power mela device, it can be adapted to the landscape.
[0031]
In addition, the photocatalytic film formed on the outer surface of the lower cover 13 has a band gap of about 3.0 eV when the titania crystal is irradiated with ultraviolet rays of 410 nm or less.
This band gap causes an electron hole in the titania fine particle, and an electron transfer reaction occurs on the surface due to the movement of the electron hole. In this electron transfer reaction, the hole has a force for extracting electrons corresponding to the energy of the band gap, that is, an oxidizing power. Therefore, the substance adhering to or contacting the surface of the titania crystal is changed by the oxidizing power of the holes.
[0032]
When the outer surface of the lower cover 13 on which the photocatalyst film is formed is irradiated with light rays including sunlight and ultraviolet rays from the infrared / ultraviolet lamp 43, the photocatalyst film exhibits a catalytic action and a hydrophilic action. The dirt attached to the outer surface of the lower cover 13 can be decomposed and removed, and water droplets such as rainwater attached to the outer surface of the lower cover 13 can easily flow due to the hydrophilic action and the curved surface of the lower cover 13.
[0033]
In addition, during the rain, the rainwater that flows down through the upper cover 12 is received by the heel portion 26, flows through the premises of the heel portion 26 in the direction of drainage by the inclination of the heel portion 26, and is drained to the outside through the drainage groove 27. Therefore, it is possible to prevent the lower cover 13 disposed on the lower side of the collar portion 26 from being contaminated by rainwater that travels through the upper cover 12, and the quality and recognizability of the video imaged by the camera body 31 through the lower cover 13 can be improved. Furthermore, since the draining direction is opposite to the shooting direction of the camera body 31, it is possible to prevent rainwater drained through the collar 26 from appearing in the image of the camera body 31.
[0034]
And since the collar part 26 is inclined downward toward the drainage direction, even if the collar part 26 is formed around the case 11, sunlight or rainwater directly hits the photocatalyst film on the outer surface of the lower cover 13. Thus, the effect of disassembling the dirt on the outer surface of the lower cover 13 and the effect of cleaning the dirt can be improved. That is, by increasing the inclination angle of the central axis S of the camera apparatus main body 1 and installing the camera apparatus main body 1 with the direction of the arrow U shown in FIG. Therefore, it is possible to enhance the cleaning effect of flowing dirt by rainwater.
[0035]
In addition, since the photocatalyst film is a visible light transmissive and ultraviolet light absorbing film, sufficient photocatalytic action can be obtained, and a decrease in visible light transmittance can be suppressed, improving the image quality without impairing the CCD sensitivity. it can.
[0036]
Furthermore, the infrared rays from the infrared / ultraviolet lamp 43 can prevent condensation on the surface of the lower cover 13 and prevent freezing, as well as ensure the allowable operating temperature of the camera body 31, and can be used in cold areas. Therefore, the lower cover 13 is prevented from being contaminated, dewed, and the like, and can ensure translucency. Therefore, it is possible to improve the quality and recognizability of an image photographed by the camera body 31 through the lower cover 13.
[0037]
Further, since the infrared-ultraviolet lamp 43 to the rear side than the lens 33 of the camera body 31 is disposed, light rays from the lamp 43 is not incident on the record emission's 33 of the camera body 31, is captured by the camera body 31 The catalytic effect can be improved without affecting the image.
[0038]
In addition, since the infrared / ultraviolet lamp 43 is supported by the camera body 31, the relationship between the camera body 31 and the lamp 43 is constant, and the lamp 43 has a relationship with respect to the photocatalytic film in the shooting direction of the camera body 31. A certain amount of light can be irradiated.
[0039]
Since the lamp 43 is formed and arranged in a substantially U shape along the periphery of the camera body 31, a necessary irradiation range can be sufficiently irradiated with the light from one lamp 43. The lamp 43 may be formed in a ring shape. Further, since the lamp 43 is a small and lightweight cold cathode lamp, it can be arranged close to the camera body 31 and the entire camera device can be configured compactly.
[0040]
The case 11 includes an upper cover 12 having a flange portion 26 and a lower cover 13 having a light transmitting portion 23, and the joint surface between the upper cover 12 and the lower cover 13 is inclined downward in the direction of drainage. The downward inclination can be easily set. Further, the camera body 31 can be easily adjusted by separating the upper cover 12 and the lower force bar 13, and any upper cover 12 and lower cover 13 can be combined.
[0041]
The lower cover 13 is made of a light-transmitting resin and is substantially hemispherical. However, the lower cover 13 is molded by making the ascending side of the lower cover 13 correspond to the shooting direction of the camera body 31. It is not necessary to use the peripheral part where distortion is likely to occur at the time of photographing, and the central side with less distortion or the like and stable translucency can be used, thereby improving the image quality.
[0042]
Further, even if the entire surface of the lower cover 13 is the light transmitting portion 23, the camera body 31 housed in the lower cover 13 is covered with the camera cover 32, so that the camera body 31 is hidden and the camera device is not conscious. You can
[0043]
In addition, since the shooting direction of the camera body 31 can be changed in the case 11, an arbitrary direction can be shot even when the case 11 is installed. Alternatively, only a part of the lower case 13 may be used as the light transmitting part 23 and the other part may be formed in the light shielding part.
[0044]
【The invention's effect】
3. The camera device according to claim 1, wherein a light transmitting portion is provided in a part of a lower cover of the case formed in a substantially hemispherical shape, and is located behind the lens of the camera body in the case and below the camera body. In addition , a light source that can irradiate infrared rays and ultraviolet rays is arranged around both sides, so that the camera device can be adapted to the landscape without being conscious of the camera device, and further, the inside of the camera device is made difficult to fog. The catalytic action by the photocatalytic film can be activated and a clear image can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view in which a part of a camera apparatus showing a first embodiment of the present invention is cut away.
FIG. 2 is a front view in which a part of the camera device is cut away.
FIG. 3 is a bottom view of the camera device.
FIG. 4 is a characteristic diagram of spectral transmittance of the photocatalyst film.
FIG. 5 is a characteristic diagram of spectral sensitivity with respect to the input light wavelength of the monochrome CCD.
FIG. 6 is a characteristic diagram of spectral sensitivity with respect to the input light wavelength of the color CCD.
[Explanation of symbols]
11 ... Case 31 ... Camera body 43 ... Light source

Claims (2)

A case having an upper cover and a lower cover having a translucent portion at least partially and formed in a substantially hemispherical shape;
A camera body housed in a case and having a lens on the front;
A photocatalytic film formed on at least the outer surface of the light transmitting portion of the lower cover;
It is disposed along the lower side and both sides of the camera body behind the lens of the camera body, and is formed in a substantially U shape, and irradiates infrared rays and ultraviolet rays disposed between the camera body and the photocatalyst film. Capable light source;
A camera apparatus comprising:   The camera device according to claim 1, wherein the photocatalytic film is a visible light transmitting and ultraviolet absorbing film.

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