JP2018121140A - Camera device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera device which prevents a camera from degradation of visibility and stably keeps its performance by discharging water droplets to the outside even when condensation occurs on the inner wall of a clear dome.SOLUTION: The camera device comprises: a camera unit; a support part which supports the camera unit; a chassis for fixing the support part; a cover for covering the periphery of the lateral face of the chassis; a clear dome attached to the chassis or the cover to cover the camera unit; and a hydrophilic film formed on the outer surface of the clear dome. The clear dome has a water discharge hole passing therethrough between the outer surface and the inner surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a camera device, for example, a camera device such as a surveillance camera having a configuration that suppresses a decrease in visibility due to condensation occurring inside.

  2. Description of the Related Art Conventionally, a camera device such as a surveillance camera has been provided with a clear dome for protecting a lens that captures an image from external impact and dirt adhesion. Due to the temperature difference between the inside and outside of the clear dome, condensation occurs on the inner wall of the clear dome, and when water droplets from the condensation adhere to the inner wall of the clear dome, incident light from the outside is scattered by the water droplets and the visibility of the surveillance camera It is a factor that deteriorates. In order to suppress this deterioration in visibility, surveillance cameras incorporating devices that prevent the occurrence of condensation have been developed.

In a conventional camera device, a fan and a heater that generate wind for preventing condensation are provided inside the clear dome, and the occurrence of condensation is prevented by blowing warm air on the clear dome (for example, Patent Document 1). reference).
Moreover, in the conventional surveillance camera, the generation | occurrence | production of dew condensation is prevented by mounting the dehumidification element using the electrolysis of water (for example, refer patent document 2).

JP 2005-215463 A Japanese Patent No. 4401975

  However, in the conventional camera device disclosed in Patent Document 1, it is necessary to blow hot air over a wide range in order to prevent condensation over the entire imaging range of the surveillance camera at an arbitrary lens position, so the number of nozzles is increased. Or increase the nozzle diameter. This not only complicates the structure of the surveillance camera, but also requires a large clear dome so that the nozzle and the lens do not interfere with each other, which raises a problem of increasing the size and cost of the apparatus.

In addition, in the conventional surveillance camera disclosed in Patent Document 2, a platinum catalyst is necessary for the electrolysis of water, which is the principle of dehumidification, to proceed at a low temperature, and this platinum is a very expensive metal. Therefore, there is a concern about cost increase. Furthermore, the platinum is oxidized and deteriorated with time, so that the dehumidifying performance gradually decreases, and there is a problem that the dehumidifying performance cannot be maintained for a long time.
Furthermore, in any of the patent documents, it is difficult to stably prevent condensation in the long term, and there is a problem that the visibility of the surveillance camera may be lowered due to water droplets adhering to the inner wall of the clear dome. .

  The present invention has been made to solve the above-described problems. Even if condensation occurs on the inner surface, which is the inner wall of the clear dome, water droplets are immediately drained to the outside so that the surveillance camera An object of the present invention is to obtain a camera device that can prevent a decrease in visibility and can stably maintain the performance without deterioration over time.

The camera device according to the present invention is attached to the camera unit, a support unit that supports the camera unit, a chassis that fixes the support unit, a cover that covers the periphery of the side surface of the chassis, and the chassis or the cover. A clear dome covering the camera unit; and a hydrophilic film formed on an outer surface of the clear dome, wherein the clear dome is provided with a drain hole penetrating the outer surface and the inner surface. is there.
In addition, the camera device according to the present invention is attached to the camera unit, a support unit that supports the camera unit, a chassis that fixes the support unit, a cover that covers the periphery of the side surface of the chassis, and the chassis or the cover. A clear dome that covers the camera unit, and the clear dome is made of a ceramic material.

According to the camera device of the present invention, by providing a drainage hole penetrating the inner surface and the outer surface of the clear dome, even when a water droplet due to condensation adheres to the inner surface of the clear dome, the water droplet passes through the drainage hole due to capillary action. Drained on the outer surface of the clear dome. For this reason, it is possible to prevent the incident light from being scattered by the water droplets adhering to the inner surface of the clear dome and reducing the visibility of the surveillance camera.
In addition, water droplets drained on the outer surface of the clear dome wet and spread by the hydrophilic film treated on the outer surface of the clear dome, and form a water film, so that incident light is scattered by the water film attached to the outer surface. It is possible to prevent the visibility of the surveillance camera from being lowered. Therefore, since it is not necessary to arrange a fan, a heater, or a dehumidifying element in order to prevent dew condensation, an increase in size and complexity of the camera device can be avoided. In addition, since the effect of preventing visibility deterioration does not decrease over time, the effect of preventing visibility deterioration can be stably maintained for a long time.

It is a perspective view which shows the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing in the AA of the camera apparatus in FIG. It is an expanded sectional view of the clear dome which is the principal part of the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the waste_water | drain flow by the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the waste_water | drain flow by the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the waste_water | drain flow by the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the waste_water | drain flow by the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the clear dome which shows the 1st modification regarding the drain hole of the camera apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing of the clear dome which shows the 2nd modification regarding the drain hole and hydrophilic membrane of the camera apparatus which concerns on Embodiment 1 of this invention. It is an expanded sectional view of the clear dome which is the principal part of the camera apparatus which concerns on Embodiment 2 of this invention. It is an expanded sectional view of the clear dome which is the principal part of the camera apparatus which concerns on Embodiment 3 of this invention. It is the figure which tabulated the physical property comparison result of the material for clear dome of the camera apparatus which concerns on Embodiment 3 of this invention. It is sectional drawing which shows sectional drawing of the camera apparatus which concerns on Embodiment 4 of this invention, and shows the part corresponded in sectional drawing in the AA of FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts.
1 is a perspective view showing a camera apparatus according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line AA of the camera device shown in FIG.
As shown in FIGS. 1 and 2, the camera device 10 mainly includes a base 11, a chassis 12, a cover 13, a support portion 14, a holder plate 15, a spring plate 16, a camera substrate 17, an imaging device 18, a lens 19, It consists of a clear dome 21, a drain hole 22, and a hydrophilic film 23.

  The base 11 is a disk-shaped component that covers the upper surface of the chassis 12. For example, in the case of the camera device 10 such as an indoor surveillance camera, the base 11 has a structure that can be attached to an installation location such as a ceiling. Inside the chassis 12, a power source of a device (not shown), a captured video processing unit, a communication unit with the outside, and the like are mounted. The cover 13 is a hollow cylindrical part formed of a hard material such as metal such as iron or stainless steel, and is fixed to at least one of the base 11 and the chassis 12. The cover 13 is fixed so as to cover the periphery of the side surface of the chassis 12, and protects the chassis 12 and components mounted inside the chassis 12.

A thin plate-like support portion 14 is fixed to the outside of the bottom surface of the chassis 12 by a method such as bolt fastening, and the support portion 14 has a claw portion. The support portion 14 and the holder plate 15 are integrated by fitting the projection of the holder plate 15 into the hole provided in the claw portion of the support portion 14.
The camera substrate 17 is formed of a resin material such as PPS (Polyphenylene Sulfide), and is integrated by being screwed with screws or bolts while being sandwiched between the holder plate 15 and the spring plate 16. Further, the camera substrate 17 has a hollow cylindrical protrusion, and is fixed with the shaft of the imaging device 18 inserted into the protrusion. A lens 19 is held at the tip of the imaging device 18, and a camera unit 20 is configured by the camera substrate 17, the imaging device 18, and the lens 19.

  The camera unit 20 is configured to be rotatable in the vertical direction (tilt direction) and the horizontal direction (pan direction), or in either direction, and the photographing direction of the lens 19 can be adjusted. The lens 19 collects light from the subject and forms an image on an image pickup device such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) attached to the camera substrate 17 and is photographed as an image. The

  The clear dome 21 is a semi-elliptical spherical part attached to the cover 13. Furthermore, the clear dome 21 has a shape in which the camera unit 20 including the lens 19 is accommodated inside the clear dome 21 when the cover 13 is fixed to at least one of the base 11 and the chassis 12. Is protecting. Since the image photographed by the camera device 10 is formed by the light incident on the lens 19 through the clear dome 21, the clear dome 21 has a high light transmittance so that the incident light is not blocked by the clear dome 21. It is preferably composed of a transparent or translucent material.

  As a general constituent material of the clear dome 21, PC (polycarbonate) or PMMA (polymethacrylate) which is a resin material excellent in moldability and transparency is used. Since PC is a material having excellent impact resistance, it is not easily destroyed by external impact, and has a high ability to protect the camera unit 20 including the lens 19 housed inside the clear dome 21. On the other hand, since PMMA has a higher ultraviolet transmittance than PC, it can shoot clearer images. Further, it is superior to PC in weather resistance such as ultraviolet ray degradation, chemical resistance, and scratch resistance. These materials are preferably selected in view of performance and specifications required for the camera device 10. Since it is inferior to a resin material in terms of moldability, the opportunity to be used as a constituent material of the clear dome 21 is limited, but the clear dome 21 may be configured using a glass material.

  FIG. 3 is an enlarged cross-sectional view of the clear dome 21 that is a main part of the camera device 10 according to Embodiment 1 of the present invention. A hydrophilic film 23 is treated on the outer surface of the clear dome 21, and drainage holes 22 penetrating the inner and outer surfaces on the semi-elliptical spherical surface of the clear dome 21 are formed. The drain hole 22 may be formed by molding the clear dome 21 using a resin material such as PC or PMMA by an injection molding process, or by molding the clear dome 21 after injection molding by machining such as laser processing. Also good.

The drain hole 22 only needs to penetrate the inner and outer surfaces on the semi-elliptical spherical surface of the clear dome 21, and the shape, direction, number, and position of the drain hole 22 are not particularly limited. The larger the diameter of the drain hole 22 is, the better the water draining ability can be expected. On the other hand, incident light is scattered on the edge and inner wall surface of the drain hole 22, or the drain hole 22 is reflected in the image taken by the camera device 10. There is a concern that it will be drunk. For this reason, it is preferable that the diameter of the drain hole 22 is 1 mm or less.
Here, it goes without saying that the diameter of the drain holes 22 need not be the same in all the drain holes 22. Moreover, it can be expected that water droplets are drained by capillarity regardless of the direction of the drain hole 22, but the height of the outer surface of the drain hole 22 is higher than the height of the inner surface when the camera device 10 is attached. It can be expected that drainage capacity will be improved due to the influence of gravity.

The hydrophilic film 23 is made of a material in which a solid material having a hydrophilic group such as silica or cellulose is mixed and dispersed in a liquid such as alcohol or water. The hydrophilic film 23 is formed on the outer surface of the clear dome 21 by a method such as spin coating, dip coating, brush coating, bar coater, flow coating, or roller coating, and volatilizing or evaporating the liquid. . As a method for volatilizing or evaporating the liquid, the liquid may be forcibly dried by heat treatment by storing it in a constant temperature furnace. As the material of the hydrophilic film 23, a material having a photocatalytic action such as TiO ₂ (titanium oxide) that exhibits hydrophilicity by ultraviolet irradiation may be used.

  Moreover, it is preferable that the contact angle with respect to the water in the surface of the hydrophilic film | membrane 23 is 40 degrees or less. For example, even when raindrops adhere to the outer surface of the clear dome 21 in the camera device 10 used outdoors, the raindrops wet and become a water film by the action of the hydrophilic film 23. Due to this effect, it is possible to avoid a decrease in visibility due to scattering of incident light, which is a concern when raindrops adhere as they are. Further, even when contaminants in the air adhere to the surface of the hydrophilic film 23, an action of washing away the contaminants can be expected by forming a water film by raindrops or the like inside the contaminant layer. This action is also effective in avoiding a decrease in visibility due to dirt adhering to the surface of the clear dome 21.

  4A to 4D are cross-sectional views showing a drainage flow by the camera device 10 according to Embodiment 1 of the present invention. As shown in FIG. 4A, condensation occurs due to a temperature difference between the inside and outside of the clear dome 21, and the water droplets 33 attached to the inner surface of the clear dome 21 follow the inner surface of the clear dome 21 as shown in FIG. 4B. Slide down. As shown in FIG. 4C, the water droplet 33 is drained to the outer surface of the clear dome 21 through the drain hole 22 provided in the clear dome 21. Then, as shown in FIG. 4D, the water droplet 33 spreads out by the action of the hydrophilic film 23 treated on the outer surface of the clear dome 21 to become a water film 34. Due to the drainage flow shown in FIGS. 4A to 4D, condensation is generated and the incident light from the outside is scattered by the water droplets 33 adhering to the inner surface of the clear dome 21, and is formed on the image sensor provided on the camera substrate 17. It is possible to avoid the phenomenon that the image of the camera device 10 deteriorates and the visibility of the camera device 10 decreases.

5 and 6 are cross-sectional views of a clear dome showing a modification of the drain hole 22 and the hydrophilic film 23 of the camera device 10 according to Embodiment 1 of the present invention. As shown in FIG. 5, a plane passing through the lowest point 35 located on the lowermost side on the outer surface of the clear dome 21 in a state where the camera device 10 is installed at a video shooting position such as a ceiling is a sewage plane 36. . Further, as shown in FIG. 5, a plane obtained by translating the sewage plane 36 vertically upward by a height corresponding to 20% of the maximum diameter on the semi-elliptical sphere of the clear dome 21 is defined as a dip plane 37. A region sandwiched between the lower horizontal surface 36 and the upper horizontal surface 37 is defined as a tip region 38 of the clear dome 21.
At this time, the sum of the bottom area of the inner surface of the clear dome 21 of the drain hole 22 provided in the tip area 38 of the clear dome 21 corresponds to the tip area 38 of the clear dome 21 before the drain hole 22 is formed. The drainage hole bottom area occupancy calculated by dividing by the surface area of the inner surface of the clear dome 21 is larger than the drainage hole bottom area occupancy in the region other than the tip end region 38 of the clear dome 21. 22 may be formed.

With this configuration, the drainage capacity in the tip end region 38 of the clear dome 21 can be locally increased, so that condensation occurs and the water droplets 33 adhering to the inner surface of the clear dome 21 are not drained, and the tip of the clear dome 21 is not drained. Even if it accumulates on the inner surface of the region 38, it can be immediately drained to the outer surface of the clear dome 21.
In addition, as shown in FIG. 6, the drainage capacity can be improved by treating the hydrophilic film 23 on the inner surface of the clear dome 21 and the inner wall surface of the drainage hole 22. The treatment range of the hydrophilic film 23 is not particularly limited and may be formed on the outer surface of the lens 19 or the like.

  As described above, in the first embodiment, by providing the drain hole 22 penetrating the inner and outer surfaces of the clear dome 21 on the semi-elliptical spherical surface of the clear dome 21 treated with the hydrophilic film 23, the clear dome is caused by the occurrence of condensation. Even when the water droplet 33 is attached to the inner surface of the clear dome 21, the water droplet 33 is drained to the outer surface of the clear dome 21 through the drain hole 22 due to capillary action, so that the incident light is incident on the inner surface of the clear dome 21 by the water droplet 33 attached. It is possible to avoid the event that the visibility of the camera device 10 is reduced due to scattering.

  Further, the water droplet 33 drained on the outer surface of the clear dome 21 spreads out by the hydrophilic film 23 treated on the outer surface of the clear dome 21 to form a water film 34, so that the water film 34 adhered to the outer surface is formed. Can also prevent scattering of incident light. Furthermore, since the camera device 10 according to the first embodiment of the present invention does not require a fan, a heater, a dehumidifying element, or the like to prevent the occurrence of condensation as a method for avoiding a decrease in visibility, the camera device 10 is large. And the complexity of the structure can be avoided, and the effect of preventing the deterioration of visibility can be stably maintained for a long period of time.

Embodiment 2. FIG.
FIG. 7 is an enlarged cross-sectional view of a clear dome 21a that is a main part of the camera apparatus according to Embodiment 2 of the present invention. As shown in FIG. 7, a drain hole 22a is formed on the semi-elliptical spherical surface of the clear dome 21a so as to penetrate the inner and outer surfaces of the clear dome 21a. The drain hole 22a is provided with a gradient from the inner surface to the outer surface of the clear dome 21a, and is formed such that the diameter of the drain hole 22a on the inner surface is larger than the diameter of the drain hole 22a on the outer surface. Yes.
With this configuration, a pressure loss difference is generated between the inner surface and the outer surface of the drain hole 22a provided in the clear dome 21a. From the inner surface of the clear dome 21a where the diameter of the drain hole 22a is large and the pressure loss is small, the drain hole 22a Water flows toward the outer surface of the clear dome 21a having a small diameter and a large pressure loss. As a result, the water droplets 33 that are condensed and adhere to the inner surface of the clear dome 21 can be positively drained.

Further, even when raindrops or the like adhere to the outer surface of the clear dome 21, the clear dome 21 has a large diameter of the drain hole 22 and a small pressure loss from the outer surface of the clear dome 21 where the diameter of the drain hole 22 is small and the pressure loss is large. It is possible to suppress the water droplet 33 from entering the inner surface.
As described above, in the second embodiment, a pressure loss difference is generated between the inner surface and the outer surface of the drain hole 22a provided in the clear dome 21a, and the inner surface having a small pressure loss is actively applied to the outer surface having a large pressure loss. Water droplets are discharged, and the drainage capacity of the water droplets 33 attached to the inner surface of the clear dome 21a due to the occurrence of condensation is improved. Furthermore, even when raindrops or the like are attached to the outer surface of the clear dome 21a, the entry of the water droplet 33 from the outer surface having a large pressure loss to the inner surface having a small pressure loss can be reduced as much as possible. It is possible to prevent the visibility of the camera device 10 from being lowered due to the water droplets 33 attached to the inner and outer surfaces.

Embodiment 3 FIG.
FIG. 8 is an enlarged cross-sectional view of a clear dome 21b that is a main part of the camera apparatus according to Embodiment 3 of the present invention. As shown in FIG. 8, the clear dome 21b is made of a ceramic material such as YAG: Y ₃ Al ₁₅ O ₁₂ (yttrium aluminate) or Y ₂ O ₃ (yttrium oxide) which is a porous transparent material. These materials are transparent ceramic materials that transmit light in the visible to mid-infrared wavelength band with 84% YAG and 81% Y ₂ O ₃ . Due to the porous structure that is a general characteristic of ceramic materials, a pseudo drain hole 22 is formed in the clear dome 21b made of the ceramic material. Therefore, the drain hole 22 is intentionally subjected to secondary processing. Even if it is not formed by the like, the water droplet 33 that has formed condensation and adhered to the inner surface of the clear dome 21b can be drained to the outer surface of the clear dome 21b. It is possible to avoid an event in which visibility decreases.

FIG. 9 shows a table comparing and evaluating the physical properties of transparent ceramic materials such as YAG and Y ₂ O ₃ , glass materials, and resin materials at high, medium, and low. Ceramic materials are superior in heat resistance, chemical resistance, corrosion resistance, and the like compared to glass materials and resin materials, and are expected to be used in harsh environments that cannot be used with the clear dome 21b made of glass materials or resin materials. In addition, since the ceramic material exhibits high hardness, it is difficult for scratches to occur on the inner and outer surfaces of the clear dome 21b, and an event in which the visibility of the camera device 10 decreases due to scratches can be avoided. Furthermore, since the thermal conductivity of the ceramic material is about 50 times larger than that of the resin material, the temperature difference between the inside and outside of the clear dome 21b is reduced, and it can be expected that an environment in which condensation itself is difficult to occur is expected.

  As described above, in Embodiment 3 of the present invention, the porous structure of the ceramic material functions in the same manner as the drainage hole 22 without intentionally providing the drainage hole 22 in the clear dome 21b. The water droplet 33 attached to the inner surface of the clear dome 21b can be drained to the outer surface of the clear dome 21b, and the phenomenon that the visibility of the camera device 10 is lowered due to the water droplet 33 due to the occurrence of condensation can be avoided. . In addition, since the material is harder than the clear dome 21b made of a resin material, the surface of the clear dome 21b is less likely to be scratched, thereby preventing visibility from being lowered due to the scratch. Furthermore, since the heat resistance, corrosion resistance, chemical resistance, and the like are better than those of the resin material, the camera device 10 can be used in a harsh environment that cannot be used conventionally. Since the ceramic material has a thermal conductivity approximately 50 times larger than that of the resin material, a temperature difference between the inside and outside of the clear dome 21b is reduced, and it can be expected that an environment in which condensation itself is difficult to occur is expected.

Embodiment 4 FIG.
10 is a cross-sectional view of a camera apparatus according to Embodiment 4 of the present invention, and is a cross-sectional view showing a portion corresponding to the cross-sectional view along the line AA in FIG. A camera apparatus according to Embodiment 4 of the present invention will be described below with reference to FIG. As shown in FIG. 10, the camera device 10 according to the fourth embodiment of the present invention has a middle plate 24 inside a chassis 12c, and a space 26 surrounded by the middle plate 24 and the bottom and side surfaces of the chassis 12c. Have.
The outer peripheral shape of the intermediate plate 24 is similar to the inner peripheral shape of the chassis 12c. By fitting the O-ring 25 into the outer peripheral portion of the intermediate plate 24 and incorporating it into the chassis 12c, the inner wall surface of the chassis 12c. And the gap between the outer peripheral surfaces of the intermediate plate 24 is filled. The O-ring 25 may be applied with sliding grease to improve the slidability, or may be composed of a material such as fluororubber that is excellent in slidability.

  The space 26 is divided into a plurality of spaces by a partition plate 29. Here, the case where one partition plate 29 is used and the space 26 is divided into the first space 27 and the second space 28 will be briefly described. Of course, the space 26 may be further finely divided by using a plurality of partition plates 29. The partition plate 29 is provided with a first through hole 39, and a filter 32 such as a HEPA filter is installed on the first space 27 side so as to cover the first through hole 39. With this configuration, when the air existing in the first space 27 and the second space 28 moves through the first through hole 39 provided in the partition plate 29, fine foreign matters and dust contained in the air Dust is collected by the filter 32.

  In Embodiment 4 of the present invention, a circulation fan 31 is installed in one of the first space 27 and the second space 28 divided by the partition plate 29. Here, the case where the circulation fan 31 is installed in the first space 27 will be described. A second through hole 40 connected to the outside through the chassis 12c and the cover 13c is provided in the inner wall surface of the chassis 12c on the first space 27 side where the circulation fan 31 is installed. The outside air can be taken into the first space 27 through the hose 30 inserted into the first space 27. A filter 32 such as a HEPA filter is also installed on the contact surface between the hose 30 and the first space 27, and is included in the air when outside air is taken into the first space 27 via the hose 30. Fine foreign matter and dust collected are collected by the filter 32.

  A third through hole 41 is formed on the bottom surface of the chassis 12c so that each of the first space 27 and the second space 28 divided into two by the partition plate 29 communicates with the internal region covered with the clear dome 21c. Is provided. A filter such as a HEPA filter is also incorporated in the inner region of the clear dome 21c and the third through hole 41 provided so as to pass through the first space 27 and the second space 28, and is covered with the clear dome 21c. In addition, foreign substances and dust contained in the air passing through the internal region and the first space 27 and the second space 28 may be collected.

  In the configuration described above, when the circulation fan 31 is operated, the air taken into the first space 27 side through the hose 30 flows from the first space 27 side toward the second space 28 side. . At this time, foreign matter and dust contained in the air are collected by the filter 32 installed between the hose 30, the first space 27, the second space 28, and the partition plate 29. The air cleaned by removing the foreign matters thereby flows into the internal region covered with the clear dome 21c through the third through hole 41 provided in the bottom plate of the chassis 12c on the second space 28 side. The cleaning air that has passed through the internal region covered with the clear dome 21c is returned to the first space 27 side again through the third through hole 41 provided in the bottom plate of the chassis 12c on the first space 27 side, This circulation is repeated as long as the circulation fan 31 is operating.

As described above, in the fourth embodiment of the present invention, the cleaning air heated by the heat generated by the power of the circulation fan 31 is blown to the internal region covered with the clear dome 21c, so that the clear dome 21c The air in the covered inner region is warmed and condensation can be prevented. A part of the cleaning air is discharged to the outside through the drain hole 22c provided on the semi-elliptical spherical surface of the clear dome 21c.

Thereby, the role as an air cleaner can be expected at the same time while fulfilling the role as a surveillance camera by the camera device 10 installed indoors, for example. Furthermore, since it is possible to prevent foreign matter and dust from entering from the outside through the drain hole 22c due to the airflow of the cleaning air, it is possible to fill the internal region covered with the clear dome 21c with cleaning air that is relatively free of foreign matter and dust. In addition, it can be expected that the incident light from the outside is scattered by the foreign matter and a clear image can be taken. In the fourth embodiment, it goes without saying that the hydrophilic film 23c is formed on the outer surface of the clear dome 21c.
It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  DESCRIPTION OF SYMBOLS 10 Camera apparatus, 11 Base, 12 Chassis, 13 Cover, 14 Support part, 15 Holder plate, 16 Spring plate, 17 Camera board, 18 Imaging device, 19 Lens, 20 Camera unit, 21 Clear dome, 22 Drain hole, 23 Hydrophilic , 24 middle plate, 25 O-ring, 26 space, 27 first space, 28 second space, 29 partition plate, 30 hose, 31 circulating fan, 32 filter, 33 water drop, 34 water film, 35 bottom Point, 36 Lower horizontal plane, 37 Upper horizontal plane, 38 Tip region, 39 First through hole, 40 Second through hole, 41 Third through hole

Claims (6)

A camera unit;
A support portion for supporting the camera unit;
A chassis for fixing the support portion;
A cover covering the periphery of the side surface of the chassis;
A clear dome attached to the chassis or the cover and covering the camera unit;
A hydrophilic film formed on the outer surface of the clear dome,
The clear dome is provided with a drain hole penetrating the outer surface and the inner surface.   The camera device according to claim 1, wherein a contact angle with respect to pure water on a surface of the hydrophilic film is 40 degrees or less.   A plane passing through the lowest point located on the lowermost side of the outer surface of the clear dome is defined as a sewage plane, and the sewage plane is translated vertically upward by a height corresponding to 20% of the maximum diameter of the clear dome. When the plane is the upper horizontal plane, and the area between the lower horizontal plane and the upper horizontal plane is the tip end area of the clear dome, the clear dome of the drain hole provided in the tip end area of the clear dome The drain hole bottom area occupancy calculated by dividing the sum of the bottom area of the inner surface by the surface area of the inner surface of the clear dome corresponding to the tip region of the clear dome before forming the drain hole is 3. The camera device according to claim 1, wherein the clear dome has a drain hole bottom area occupancy ratio other than the tip region of the clear dome. The diameter of the drainage hole provided in the clear dome has a gradient in the depth direction of the drainage hole,
4. The camera device according to claim 1, wherein a diameter of the drain hole is smaller on the outer surface than on the inner surface of the clear dome. 5. A camera unit;
A support portion for supporting the camera unit;
A chassis for fixing the support portion;
A cover covering the periphery of the side surface of the chassis;
A clear dome attached to the chassis or the cover and covering the camera unit;
The camera device, wherein the clear dome is made of a ceramic material.   A circulation fan that promotes circulation of air existing inside the chassis and a filter capable of removing foreign substances contained in the air are disposed inside the chassis, and provided on the surface of the chassis. After the outside air taken in from the through hole passes through the filter, the clear dome and the inner area of the clear dome surrounded by the bottom surface of the chassis are passed through another through hole provided in the bottom surface of the chassis. 6. The camera apparatus according to claim 1, wherein the camera apparatus is discharged.

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