JP6861595B2 - Surveillance camera - Google Patents

Description

The present invention relates to surveillance cameras.

Surveillance cameras are required to have impact resistance so that the photographing function is not lost even if an external force or impact is applied. As a surveillance camera, there is a camera provided with a substantially spherical dome cover, a camera unit close to the dome cover, and a light-shielding rubber surrounding the lens of the camera unit and close to the dome cover (see, for example, Patent Document 1). In order to realize impact resistance, this surveillance camera is provided with a mechanism (impact mitigation structure) in which the camera unit and the light-shielding rubber are each subducted. That is, in this surveillance camera, when the dome cover is deformed by an external force or impact, the light-shielding rubber and the camera unit are configured to sink in the order of two steps by the deformation of the elastic member of the impact mitigation structure. ..

Japanese Unexamined Patent Publication No. 2016-163056

However, in a conventional surveillance camera, it is necessary to configure an impact mitigation structure with a plurality of parts at two locations, a camera unit and a light-shielding rubber. Therefore, there is a problem that the number of parts constituting the surveillance camera increases and the structure of the surveillance camera becomes complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a surveillance camera capable of eliminating the need for an impact mitigation structure.

The surveillance camera according to the present invention includes a camera unit having a lens, a dome cover covering the camera unit, and a light-shielding component attached to the camera unit to suppress light incident from outside the angle of view of the lens. distance in photographing direction of the camera unit between the dome cover is much larger than the deformation amount of the dome cover in the case of receiving the resilience or acceptable external impact, shielding parts between the lens and the dome cover Therefore, it has a light-shielding wall located outside the angle of view of the lens and a mechanism for promoting deformation of the light-shielding wall toward the outer peripheral surface side, and the mechanism is a groove formed on the outer peripheral surface of the light-shielding component. It is a feature.

According to the present invention, since it is configured as described above, the shock absorbing structure can be eliminated.

1A and 1B are views showing a configuration example of a main part of the surveillance camera according to the first embodiment of the present invention, FIG. 1A is an external perspective view, and FIG. 1B shows a state in which the dome cover is removed. It is a perspective view. It is sectional drawing which shows the structural example of the main part of the surveillance camera which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structural example of the main part of the surveillance camera which concerns on Embodiment 1 of this invention, and is the figure explaining the stray light incident on a lens. It is sectional drawing which shows the structural example of the main part of the surveillance camera which concerns on Embodiment 2 of this invention. 5A to 5F are views showing another configuration example of the light-shielding wall according to the second embodiment of the present invention. It is sectional drawing which shows the structural example of the main part of the surveillance camera which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the structural example of the main part of the surveillance camera which concerns on Embodiment 3 of this invention, and is the figure which shows the state which the light-shielding component is deformed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a main part of a surveillance camera according to a first embodiment of the present invention.
As shown in FIG. 1, the surveillance camera includes a dome cover 1, a cover holding portion 2, a main body portion 3, a lens holder 4, and a camera unit 5.

The dome cover 1 is a member that has a substantially spherical shape and covers the camera unit 5. The dome cover 1 is made of a highly transparent material such as plastic.
The cover holding portion 2 is formed in a substantially cylindrical shape, and is a member to which the dome cover 1 is attached to one end to hold the dome cover 1, and the other end is attached to the main body portion 3.

The lens holder 4 is a member that holds the camera unit 5, and is attached to the main body 3 via a support member.
The camera unit 5 is a member that photographs a predetermined area, has a lens barrel provided with a lens 51 at one end, and is held by the lens holder 4 at the other end.

Further, as shown in FIG. 2, a constant distance L is provided between the surface of the lens 51 included in the camera unit 5 and the inner surface of the dome cover 1. This distance L is designed to be larger than the amount of deformation of the dome cover 1 when a force (allowable force) or an impact (allowable impact) of a magnitude required to withstand the product specifications is received from the outside. The entire space between the lens 51 and the dome cover 1 when the lens 51 and the dome cover 1 are separated by the fixed distance L is referred to as an impact mitigation space 6. The impact mitigation space 6 eliminates the need for an impact mitigation structure as in conventional surveillance cameras. Note that FIG. 2 omits the detailed configuration of the main body 3 and the camera unit 5.

As described above, according to the first embodiment, the camera unit 5 having the lens 51 and the dome cover 1 covering the camera unit 5 are provided, and the distance L between the lens 51 and the dome cover 1 is external. Since it is larger than the amount of deformation of the dome cover 1 when it receives an allowable force or an allowable impact from the dome cover 1, the impact mitigation structure can be eliminated. As a result, the number of parts constituting the surveillance camera can be reduced as compared with the conventional surveillance camera, and the surveillance camera can be simplified.

Embodiment 2.
In the surveillance camera according to the first embodiment, a case where the impact mitigation space 6 is provided between the lens 51 of the camera unit 5 and the dome cover 1 is shown. In this case, stray light is likely to be incident on the lens 51. The stray light is light that is incident on the lens 51 by repeatedly reflecting light from outside the angle of view of the lens 51 such as illumination or sunlight on the inner and outer surfaces of the dome cover 1. For example, the light indicated by reference numeral 301 in FIG. 3 is stray light. In FIG. 3, the cover holding portion 2 and the main body portion 3 are not shown, and the detailed configuration of the camera unit 5 is not shown. The angle of view represents the range of the image captured by the camera unit 5 in terms of angle. In a surveillance camera, when stray light is incident on the lens 51, an image is reflected and the quality of the image is deteriorated. When the distance L between the lens 51 and the dome cover 1 is increased in order to improve the impact resistance, the degree of damage due to stray light becomes remarkable. Therefore, the second embodiment shows a case where the surveillance camera is provided with a light-shielding component 7 for suppressing stray light from outside the angle of view of the lens 51.

FIG. 4 is a cross-sectional view showing a configuration example of a main part of the surveillance camera according to the second embodiment of the present invention. In the surveillance camera shown in FIG. 4, the camera unit 5 has a zoom function and has a cylinder (movable part) 52 and a cylinder (fixed part) 53 for moving the position of the lens 51 back and forth in the lens barrel. It shows. Further, in FIG. 4, the cover holding portion 2 and the main body portion 3 are not shown, and the detailed configuration of the camera unit 5 excluding the cylinder 52 and the cylinder 53 is not shown.

The light-shielding component 7 is provided in the camera unit 5 and suppresses the incident of light (stray light) from outside the angle of view of the lens 51 possessed by the camera unit 5. The light-shielding component 7 is made of an elastic member such as rubber or a film. As shown in FIG. 4, the light-shielding component 7 has a light-shielding wall 71 and a contact portion 72.

The light-shielding wall 71 is a portion between the lens 51 and the dome cover 1 and located outside the angle of view of the lens 51. FIG. 4 shows a case where the light-shielding wall 71 is formed in a tubular truncated cone shape. The light-shielding wall 71 suppresses stray light from entering the lens 51. Further, by locating the light-shielding wall 71 outside the angle of view of the lens 51, it is possible to prevent the light-shielding wall 71 from being reflected in the image captured by the camera unit 5. When the camera unit 5 is equipped with a zoom lens, the light-shielding wall 71 is located outside the widest angle of view of the zoom lens. Further, the spreading angle (apical angle) of the light-shielding wall 71 is configured not to be too wide. This is because if the spreading angle of the light-shielding wall 71 is too wide, the stray light that can prevent the intrusion into the lens 51 is reduced. Therefore, it is desirable that the light-shielding wall 71 is located outside the angle of view of the lens 51 and in the vicinity thereof.

The contact portion 72 is a portion in contact with the camera unit 5, and the inner peripheral surface is in contact with one of the cylinder 52 or the cylinder 53 in the camera unit 5, and the light-shielding wall 71 is integrally connected to one end. FIG. 4 shows a case where the contact portion 72 is formed in a cylindrical shape. As shown in FIG. 4, the contact portion 72 has a shape that is in contact with the sliding cylinder 52 of the camera unit 5 and not in contact with the non-sliding cylinder 53. This is to prevent dust from being generated from the light-shielding component 7 when the cylinder 52 slides. The influence of dust and the sliding of the camera unit 5 will be described below.

When dust is generated inside the surveillance camera, the dust adheres to the surface of the lens 51 or the inner surface of the dome cover 1. As a result, dust is reflected in the image, which deteriorates the quality of the image. The reason why dust is generated inside the machine is that some of the parts are separated as powder due to friction between the parts. For example, when the contact portion 72 is arranged across the cylinder 52 and the cylinder 53 with respect to the camera unit 5 having the zoom function, friction occurs. On the other hand, by making the contact portion 72 in contact with only one of the cylinder 52 and the cylinder 53, the friction between the light-shielding component 7 and the camera unit 5 can be suppressed.

The shape of the light-shielding wall 71 is not limited to the shape shown in FIG. 4, and may be, for example, the shape shown in FIG. For example, the light-shielding wall 71 may be formed in a cylindrical shape as shown in FIGS. 5A to 5C. Note that FIG. 5A shows a case where the light-shielding wall 71 has a twisted structure, FIG. 5B shows a case where the light-shielding wall 71 has a honeycomb structure, and FIG. 5C shows a case where the light-shielding wall 71 has a lantern (bellows) structure. The light-shielding wall 71 can be made elastic by the structure of. Further, the light-shielding wall 71 may be formed in a square cylinder shape as shown in FIG. 5D. Further, the light-shielding wall 71 may be formed of a film. For example, by arranging the films in a petal shape as shown in FIG. 5E, a cylindrical truncated cone shape as shown in FIG. 4 or a bowl-shaped light-shielding wall 71 having an open bottom surface as shown in FIG. 5F can be formed. .. When a film is used, it has a high affinity with the light-shielding wall 71 shown in FIGS. 5A to 5D.

As described above, according to the second embodiment, since the camera unit 5 is provided with the light-shielding component 7 that suppresses the incident light from outside the angle of view of the lens 51, the effect in the first embodiment can be obtained. In addition, the incident of stray light on the lens 51 can be suppressed, and the quality of the image can be maintained.

Embodiment 3.
In the second embodiment, a case where the camera unit 5 is provided with the light-shielding component 7 is shown. On the other hand, the third embodiment shows a case where the light-shielding component 7 also functions as an impact mitigation structure.
FIG. 6 is a cross-sectional view showing a configuration example of a main part of the surveillance camera according to the third embodiment of the present invention. In the surveillance camera according to the third embodiment shown in FIG. 6, the configuration of the light-shielding component 7 is changed from that of the surveillance camera according to the second embodiment shown in FIG. Other configuration examples are the same, and the same reference numerals are given and the description thereof will be omitted. In FIG. 6, the cover holding portion 2 and the main body portion 3 are not shown, and the detailed configuration of the camera unit 5 is not shown.

The light-shielding component 7 has a groove 73 in addition to the configuration (light-shielding wall 71 and contact portion 72) of the light-shielding component 7 in the second embodiment. The groove portion 73 is formed on the outer peripheral surface of the light-shielding component 7, and constitutes a mechanism for promoting deformation of the light-shielding wall 71 toward the outer peripheral surface side. With the groove 73, the light-shielding component 7 functions not only as a function of suppressing the incident of stray light on the lens 51 but also as a shock absorbing structure.
Further, the light-shielding component 7 is made of an elastic member such as rubber or a film. Further, the light-shielding wall 71 is designed so that the angle θ formed by the tangent line to the end portion on the inner peripheral surface and the tangent line to the intersection point with the tangent line on the inner surface of the dome cover 1 is 60 degrees or less. Further, the light-shielding wall 71 is configured so that the thickness gradually decreases from the root to the end.
Hereinafter, impact mitigation by the light-shielding component 7 will be described.

By separating the lens 51 of the camera unit 5 from the dome cover 1 and further providing the light-shielding component 7 on the camera unit 5, the force or impact received from the outside by the dome cover 1 is transmitted to the light-shielding component 7. At this time, if the light-shielding component 7 is deformed, the above-mentioned force or impact is absorbed, and transmission to the camera unit 5 can be suppressed. By making the light-shielding component 7 easily deformed in this way, the light-shielding component 7 can be used as a cushioning material.

Therefore, in the third embodiment, a mechanism for promoting the deformation of the light-shielding wall 71 is added by providing the light-shielding component 7 with the groove portion 73. With the groove 73, a base point for deformation of the light-shielding component 7 can be provided on the outer peripheral surface of the light-shielding component 7. FIG. 6 shows a case where the groove portion 73 is formed at the connection portion between the light-shielding wall 71 and the contact portion 72 (the root of the light-shielding wall 71), but the present invention is not limited to this, and the groove portion 73 may be formed on the outer peripheral surface of the light-shielding component 7. Just do it.

Further, the light-shielding wall 71 is designed so that the angle θ formed by the tangent line to the end portion on the inner peripheral surface and the tangent line to the intersection point with the tangent line on the inner surface of the dome cover 1 is 60 degrees or less. As a result, as shown in FIG. 7, the deformation direction of the light-shielding component 7 can be regulated toward the outer peripheral surface side. As a result, the light-shielding component 7 is less likely to be deformed toward the inner peripheral surface side. For example, when the dome cover 1 receives a force or impact from the direction of arrow A or arrow B shown in FIG. 6, the light-shielding component 7 is the lens 51. It is possible to suppress the entry into the angle of view and maintain the quality of the image. In FIG. 7, the dome cover 1, the cover holding portion 2, and the main body portion 3 are not shown, and the detailed configuration of the camera unit 5 is not shown.
Further, since the light-shielding component 7 is composed of an elastic member, the deformability of the light-shielding component 7 is improved. Further, the light-shielding wall 71 is configured so that the thickness gradually decreases from the root to the end, so that the light-shielding wall 71 is more easily deformed and the angle with the dome cover 1 is reduced. it can.

As described above, according to the third embodiment, the light-shielding component 7 is configured to have a mechanism for promoting the deformation of the light-shielding wall 71 toward the outer peripheral surface side. Therefore, in addition to the effect of the second embodiment, the light-shielding component 7 is light-shielded. The component 7 can function as an impact mitigation structure.

In the second and third embodiments, the distance L between the lens 51 and the dome cover 1 is designed to be larger than the amount of deformation of the dome cover 1 when the allowable force or the allowable impact is received from the outside. It is assumed, but it is not limited to this.

In the present invention, within the scope of the invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment. ..

1 Dome cover, 2 Cover holder, 3 Main body, 4 Lens holder, 5 Camera unit, 6 Impact mitigation space, 7 Shading parts, 51 Lens, 52,53 Cylindrical, 71 Shading wall, 72 Contact part, 73 Groove part.

Claims (5)

A camera unit with a lens and
A dome cover that covers the camera unit and
It is equipped with a light-shielding component that is attached to the camera unit and suppresses the incident of light from outside the angle of view of the lens.
The distance between the lens and the dome cover in the shooting direction of the camera unit is larger than the amount of deformation of the dome cover when it receives an allowable force or an allowable impact from the outside.
The light-shielding component
A light-shielding wall located between the lens and the dome cover and outside the angle of view of the lens.
It has a mechanism that promotes deformation of the light-shielding wall toward the outer peripheral surface side.
The mechanism monitors camera you wherein a periphery formed surface grooves of the light shielding part. A camera unit with a lens and
A dome cover that covers the camera unit and
It is equipped with a light-shielding component that is attached to the camera unit and suppresses the incident of light from outside the angle of view of the lens.
The light-shielding component
A light-shielding wall located between the lens and the dome cover and outside the angle of view of the lens.
It has a mechanism that promotes deformation of the light-shielding wall toward the outer peripheral surface side.
The mechanism is a surveillance camera characterized by being a groove formed on the outer peripheral surface of the light-shielding component. The light-shielding component
The surveillance camera according to claim 1 or 2, wherein the inner peripheral surface is in contact with one of a movable portion or a fixed portion of the camera unit, and has a contact portion to which the light-shielding wall is connected at one end. The light shielding wall and tangent to the ends of the inner peripheral surface, the angle between the tangent to the intersection between said tangent line at the inner surface of the dome cover, claim from claim 1, characterized in that not more than 60 degrees The surveillance camera according to any one of 3. The light shielding component is any one claim of surveillance cameras of claims 1 to 4, characterized in that it consists of an elastic member.

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