JP4397674B2 - Camera with cover - Google Patents

Description

  The present invention relates to a photographing apparatus having a cover for protecting a camera.

  In a conventional photographic device with a cover, for example, a dome-type surveillance camera device, a shielding plate is inserted into a slit formed in the dome cover between the light projecting means and the camera to prevent reflection (for example, patent) Reference 1).

JP2003-8954A.

  Conventional camera devices with a cover, such as a dome-type camera device, are configured as described above, so that an external force is applied to the dome cover, such as a natural phenomenon such as wind or snow, or contact by a third party. When the relative position of the cover changes, the relative positional relationship between the camera and the shielding plate also changes. For this reason, there is a problem that the reflected light from the dome cover cannot be shielded, or the shielding plate blocks the field of view of the camera, so that the initially set range cannot be photographed.

  Furthermore, when the relative position of the camera and the dome cover changes, the positional relationship between the camera and the dome cover must be readjusted, and when the external force applied to the dome cover is large, the camera and the shielding plate There were also problems such as touching each other and damaging each other or deforming.

  The present invention has been made to solve the above-described problems, and in a surveillance camera device having a light projecting unit, a light beam emitted from the light projecting unit is reflected by a clear cover and reflected on the camera. It is an object of the present invention to provide a dome type camera device that prevents the camera from being hindered by external influences after installation.

According to another aspect of the present invention, there is provided a photographing device with a cover, a photographing means including a camera having a light-shielding member projecting around a photographing opening, a housing in which the camera is housed, and an attachment in the housing. A light projecting means for projecting the front of the camera, and a transparent cover attached to the opening of the camera on the photographing port side of the housing, and the light-shielding member is a cylindrical soft member In the dome type imaging device formed with the tip opening being in close contact with the transparent cover, the thickness 2d of the tip opening of the soft member in close contact with the transparent cover is the thickness h of the transparent cover. Based on the refractive index n of the transparent cover and the incident angle φ at which light from the light projecting means is incident on the outer edge of the flexible member in close contact with the transparent cover, the following equation (A) is set. It is what.

According to another aspect of the present invention, there is provided a photographing device with a cover, a photographing means including a camera having a light-shielding member projecting around a photographing opening, a housing in which the camera is housed, and an attachment in the housing. A light projecting means for projecting the front of the camera, and a transparent cover attached to the opening of the camera on the photographing port side of the housing, and the light-shielding member is a cylindrical soft member In the dome type imaging device formed with the tip opening being in close contact with the transparent cover, the thickness 2d of the tip opening of the soft member in close contact with the transparent cover is the thickness h of the transparent cover. Based on the refractive index n of the transparent cover and the incident angle φ at which the light from the light projecting means is incident on the outer edge of the flexible member in close contact with the transparent cover, the above equation (A) is set. Therefore, even if an external force is applied to the cover after installation, it is possible to prevent the light emitted from the light projecting means from being reflected by the clear cover and reflected on the camera.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of Embodiment 1 of a dome type camera device according to the present invention.

  In FIG. 1, the dome type camera device is installed with a base 1 attached to the ceiling. The main body 2 includes a power source of the apparatus, a captured video processing unit, an external communication unit, a driving unit of the imaging device, and the like. A lens 4 and an optical system are attached to the camera substrate 3 to capture an image of the monitoring area. The light projecting means 5 is disposed on the camera substrate 3 and irradiates the photographing range of the lens 4. Also, a bush 10 made of rubber or urethane that is easily deformed and blocks light is attached to a lens hood 4a provided around the lens 4. The camera substrate 3, the lens 4, the lens hood 4a, the light projecting means 5, and the bush 10 are collectively driven from the main body 2 and are hereinafter collectively referred to as a camera unit 7.

  The support unit 6 rotatably supports the camera unit 7 around the axis of the support unit 6 shown in FIG. 1 (hereinafter, rotation about this axis is referred to as vertical rotation). The image capturing direction of the lens 4 is adjusted by itself rotating around the vertical axis by the main body 2 (hereinafter referred to as horizontal rotation). The clear dome 8 and the housing 9 are integrally attached to the base 1 with a clasp so as to cover the support portion 6 and the camera portion 7. The clear dome 8 is formed of a transparent or translucent transparent hard member so as not to hinder the imaging of the camera unit 7 and the light projection of the light projecting means 5. The casing 9 is formed of a cylindrical and hard member, and the casing 9 is fixed to the base 1 with an attachment metal 9a, and the main body 2, the support section 6 and the camera section 7 are connected with wind, rain, dust, moths, insects. Protect from external interference factors.

  Here, the bush 10 is attached in contact with and in close contact with the clear dome 8. However, since the rotation center of the support portion 6 is installed so as to coincide with the dome center of the clear dome 8, the camera portion 7. Since the distance between the lens hood 4a and the clear dome 8 is constant even if the photographing direction is changed by rotating, the amount of deformation of the bush 10 is kept constant.

  In the present embodiment, the base 1 is attached to the ceiling, but the dome type camera device may be attached to the wall surface according to the purpose, and the installation location is not limited. Moreover, the light beam detected by the camera unit 7 is not limited to visible light, and for example, infrared imaging may be performed. The type of light emitted by the light projecting unit 5 is not limited. For example, when performing infrared imaging, the type of light to be projected varies depending on the type of imaging, such as irradiating light including infrared rays. Moreover, in the camera part 7 shown in FIG. 1, although the light bulb comprised the figure which comprises the light projection means 5, you may comprise with a fluorescent lamp and the kind of the light projection means 5 is not limited. Further, the bush 10 may be directly or indirectly attached to the photographing port without providing the lens hood 4a around the photographing port, and the method for attaching the bush is not limited. Further, the bush 10 may be composed of a plurality of members, such as a light-shielding coating applied to a soft and translucent member, and is not limited thereto. For example, when the camera unit 7 is rotated by π radians in the vertical direction and 2π radians in the horizontal direction, the direction of 2π steradians below the ceiling becomes the shooting range. However, depending on the purpose of shooting, 2π steradians are not necessarily set as the shooting range. There is no need, and the rotation range of the camera unit 7 is not limited. Further, the clear dome 8 and the housing 9 are not limited to the configuration shown in FIG. 1. For example, the clear dome 8 and the housing 9 may be integrally formed. At this time, only the portion corresponding to the housing 9 is painted. Also good.

  FIG. 2 is a cross-sectional view of the center of FIG. 1 cut in the vertical direction, and shows the structure around the bush 10 and the clear dome 8. A part of the light projected from the light projecting means 5 is reflected on the outer wall of the clear dome 8 like the optical path 11 and proceeds toward the range of the angle of view 12 of the lens 4. However, in the present embodiment, the bush 10 protruding in the photographing direction of the lens 4 is configured to block the reflected light entering the lens 4. Since the positional relationship between the clear dome 8 and the camera unit 7 shown in FIG. 2 does not change even when the camera unit 7 rotates, the light emitted from the light projecting means 5 is reflected by the clear dome 8 and is reflected on the camera. It can be surely prevented from being reflected.

  In FIG. 2, the figure which the optical path 11 goes straight inside and outside of the clear dome 8 was shown. However, the refractive index of air filling the inside of the dome is usually about 1, whereas the refractive index of the solid constituting the clear dome 8 is larger than 1, for example, about 1.5 for glass. In this case, as shown in FIG. 3, light incident from the right is refracted by the inner surface of the clear dome 8 and then reflected by the outer surface according to Snell's law, so that the reflected light is emitted from the right side as shown in FIG. It will be.

  FIG. 4 shows an enlarged view of a portion where the light 11 emitted from the light projecting means 5 on the right side of FIG. 3 toward the right end of the bush 10 is refracted and reflected by the clear dome 8. In FIG. 4, O is the center of the clear dome 8, and h is the thickness of the clear dome 8. Now, assuming that the refractive index of air is 1 and the refractive index n of the clear dome 8, Snell's law shown in Equation 1 holds between the incident angle φ and the refractive angle ψ of the light 11 from the light projecting means 5.

On the other hand, if the linear distance between the location where the light 11 is incident on the inner surface of the clear dome 8 and the location where the same light 11 is reflected from the outer surface and exits from the inner surface is 2d, the relationship of Equation 2 is geometrically established. Yes.

If ψ is deleted from Equations 1 and 2, 2d can be expressed as Equation 3 using n, φ, and h which are design items.

That is, it was shown that if the thickness of the bush 10 is larger than 2d determined by Equation 3, the reflected light 11 from the clear dome 8 is surely blocked. In other words, the incident angle of the light 11 incident from the light projecting means 5 to the clear dome 8 at the outer edge of the ring where the bush 10 and the clear dome 8 are in close contact is φ, the thickness of the clear dome 8 is h, When the refractive index of the clear dome 8 is n, the thickness of the bush 10 is calculated by multiplying the product of the square of the remainder of φ and the square of n by the positive square root of the reciprocal of the value obtained by subtracting 1 and 2h. This means that the reflected light 11 is blocked when the thickness is thick.

  In addition, the right side of Equation 3 takes the maximum value of the right side of Equation 4 when φ = 90 degrees when h and n are constant.

If 2d is set to be larger than the right side of Equation 4, even when an external force is applied to the clear dome 8 and φ changes, the reflected light from the clear dome 8 can be reliably blocked. In other words, when the bush 10 is thicker than the product of the positive square root of the reciprocal of the value obtained by subtracting 1 from the square of n and 2h, the reflected light 11 is clear from the light projecting means 5. That is, it is blocked regardless of the positional relationship with the dome 8.

  Here, if the outer diameter is increased without changing the inner diameter, the thickness of the bush 10 can be increased without narrowing the angle of view of the lens 4.

  Further, in the present embodiment, the rotation center of the support portion 6 is configured to coincide with the dome center of the clear dome 8, so that the lens hood 4a is changed even when the camera portion 7 is rotated to change the photographing direction. Since the distance between the clear dome 8 and the clear dome 8 is constant, the configuration in which the bush 10 is in close contact with the clear dome 8 is always maintained even when the camera unit is rotated. It can prevent reflection and reflection on the camera.

  In the present embodiment, a structure is shown in which the bush 10 is in close contact with the clear dome 8 and the tip is elastically deformed. Since the bush 10 is made of a soft and light-shielding member, an external force is applied to the clear dome 8 and the housing 9, and the elastic deformation of the bush 10 occurs when the clear dome 8 and the camera unit 7 are slightly close to each other. When the clear dome 8 and the camera unit 7 are slightly separated from each other, the amount of elastic deformation of the bush 10 is slightly reduced. However, the bush 10 is in close contact with the clear dome 8 shown in FIG. The elastically deformed structure is maintained, and the thickness of the bush 10 does not change greatly. At this time, the incident angle φ shown in FIG. 4 slightly changes, but if 2d is designed with a margin based on Equation 3, the light emitted from the light projecting means 5 is reflected by the clear dome 8 and reflected on the camera. Can be prevented.

As described above, in the present embodiment, the configuration in which the bush 10 is in close contact with the clear dome 8 is shown. However, depending on the positional relationship between the lens 4, the lens hood 4a, the light projecting means 5, and the clear dome 8, the bush 10 may be the clear dome. Even if it is not in close contact with the light, it can be shielded from light. Therefore, a configuration in which the bush 10 is short in FIG. Further, in FIG. 1, the bush 10 is not attached, but the outer diameter of the collar portion of the lens hood 4a (the donut-like portion to which the bush 10 is attached) is widened and emitted from the light projecting means 5 shown in FIG. The optical path 11 toward the periphery of the lens 4 may be blocked before reaching the clear dome 8.
Embodiment 2. FIG.
FIG. 5 is an exploded perspective view of Embodiment 2 of the dome type camera device according to the present invention. FIG. 6 is a side view of FIG. In the figure, the same reference numerals as those in FIG.

  In FIG. 5, a hook 9 b is provided to attach the housing 9 to the base 1. FIG. 6 shows a method of attaching the housing 9 to the base 1 using the hook 9b. First, the hook 9b is inserted into a female hole (not shown) provided in the base 1, and the housing 9 is left as it is. 9 is rotated in the direction of the arrow in FIG. 6, and finally, the housing 9 is fixed by a mounting metal 9a. Instead of the hook 9b, a mechanical part such as a hinge or an arm may be used, and this is not limited.

  As described above, according to the method for attaching the housing 9 to the base 1 shown in the present embodiment, the housing 9 is positioned in the horizontal direction with respect to the base 1 with the hook 9b. The positional relationship with the clear dome 8 is appropriately set.

In addition, since the housing 9 is supported by the hook 9b with respect to the base 1 during the removal process at the time of attachment, the work can be stably performed.
Embodiment 3 FIG.
FIG. 7 is a side view of Embodiment 3 of the photographing apparatus with a cover according to the present invention. In the figure, the same reference numerals as those in FIG. The clear cover 8 a is a flat plate formed of a transparent or translucent transparent hard member that protects the main body 2 and the camera unit 7. As in FIG. 2, the bush 10 is in close contact with the clear cover 8a, and the light reflected from the light projecting means 5 is blocked from being reflected on the lens 3 by the clear cover 8a.

  In the photographing apparatus with a cover in FIG. 7, the camera unit 7 performs photographing by being driven in parallel with the clear cover 8a as indicated by an arrow. Since it is driven in this way, the distance between the lens hood 4a and the clear dome 8 is constant, so that the configuration in which the bush 10 is in close contact with the clear cover 8a is always maintained even when the camera unit is driven. It is possible to prevent the light emitted from the means 5 from being reflected by the clear cover 8a and reflected on the camera. Further, as described with reference to FIG. 4, if the thickness of the bush is set to be equal to or greater than the right side of Formula 4, the light emitted from the light projecting means 5 is transmitted to the clear cover 8a even when an external force is applied to the clear cover 8a. It can prevent reflection and reflection on the camera.

1 is an exploded perspective view of Embodiment 1 of a photographing apparatus with a cover according to the present invention. It is sectional drawing of Embodiment 1 of the imaging device with a cover by this invention. It is sectional drawing of Embodiment 1 of the imaging device with a cover by this invention. It is an enlarged view of a section of Embodiment 1 of an imaging device with a cover by the present invention. It is a disassembled perspective view of Embodiment 2 of the imaging device with a cover by this invention. It is a side view of Embodiment 2 of the imaging device with a cover by this invention. It is a side view of Embodiment 3 of the imaging device with a cover by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base, 2 Main body, 3 Camera board, 4 Lens, 4a Lens hood, 5 Light projection means, 6 Support part, Camera part, 8 Clear dome, 9 Case, 9a Mounting bracket, 9b Hook 10 Bush, 11 Optical path, 12 Lens angle of view

Claims (4)

A photographing means provided with a camera in which a member having a light-shielding property is projected and worn around the photographing port;
A housing containing the camera;
A light projecting means mounted in the housing and projecting the front of the camera;
A transparent cover attached to the opening of the camera on the photographing port side of the housing;
In the dome-shaped imaging device provided with the light-shielding member formed of a cylindrical soft member and having its tip end in close contact with the transparent cover ,
The thickness 2d of the distal end of the flexible member that is in close contact with the transparent cover includes the thickness h of the transparent cover, the refractive index n of the transparent cover, and the light projection on the outer edge of the flexible member that is in close contact with the transparent cover. A dome-type imaging device, which is set by the following equation (A) based on an incident angle φ at which light from the means is incident .

The transparent cover is a transparent dome-shaped cover;
2. The dome type photographing apparatus according to claim 1, wherein the photographing unit includes a driving unit that rotates the photographing direction of the camera around the center of the transparent dome cover.   2. The dome type photographing apparatus according to claim 1, wherein the cylindrical flexible member is a rubber bush. The photographing means includes driving means for moving the camera perpendicular to the photographing direction,
The photographing apparatus with a cover according to claim 1, wherein the transparent cover is a flat surface.

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