KR101187904B1 - Monitoring camera - Google Patents

Abstract

The present invention includes a housing having a face portion disposed on the front surface to transmit light incident from the outside, a camera disposed in the housing and photographing an image of an external subject with light incident through the face portion, An extension portion extending toward the front from which the light is incident at one end and an induction portion extending from an end portion of the extension portion and bent toward the rear of the housing, wherein the camera converts the incident light into an electrical signal; Disclosed is a surveillance camera having a changing image pickup device and a zoom lens for adjusting a focal length so that the incident light forms an image on the image pickup device.

Description

Monitoring camera

The present invention relates to a surveillance camera, and more particularly to a surveillance camera capable of reducing false alarms of the surveillance camera.

In general, surveillance cameras are installed indoors and outdoors, such as public buildings, general houses, offices, hospitals, and used for theft prevention, security, access control, or crime prevention, and are used for industrial purposes to easily check the operation status and process flow of machines. Recently, it is widely used in various fields such as being installed in underground parking lots where crime frequently occurs.

The surveillance camera, together with the control, constitutes a surveillance system. The control adjusts and controls the surveillance camera manually or automatically. Recently, a surveillance system adds a moving object detection tracking system capable of detecting and tracking a moving object, and generates a detection event for a user when the moving object appears in an image received from the surveillance camera. When the moving object is captured by the surveillance camera, the surveillance camera detects the moving object within a range that can be rotated by the moving object detection tracking system.

1 is a perspective perspective view schematically showing the structure of a conventional surveillance camera.

Referring to FIG. 1, a conventional surveillance camera 10 includes a housing 11, a camera portion 12, a face portion 13 of a housing, and a sun shield 14 of the housing.

The camera unit 12 is disposed in the housing 11. The housing 11 functions to protect the camera unit 12 from the external environment of the surveillance camera 10.

The surveillance camera 10 may have a sun shield 14 extending forward from one end of the front portion of the housing 11. The sun shield 14 extends from the top and side surfaces of the housing 11 to take the form of a sun cap. The sun shield 14 prevents rainwater and other dirt from flowing on the face part 13 disposed in front of the camera part 12, and also prevents light incident directly from the upper part of the surveillance camera 10. do.

However, as shown in FIG. 1, since the sun shield 14 of the conventional surveillance camera 10 is limitedly extended from the upper surface and the side of the housing 11, the surveillance camera 10 moves up, down, left, and right to perform surveillance activities. It can provide the cause of false alarms caused by light or rainwater in a certain direction. That is, when the surveillance camera 10 is rotated, light is incident at a specific position and the image is formed on the lens of the camera unit 12 or the light is scattered on the foreign matter present on the face part 13 to continue in the moving object detection tracking system. It generates a false alarm. In addition, during rainfall, rainwater may flow from the end of the housing 11 to the face portion 13 to generate a false alarm.

2 is a photograph showing an example of a false alarm occurring in a conventional camera. When rainwater or foreign matter is present on the face portion 13, there is a problem that a false alarm occurs because it is mistaken to be a moving object as shown in (X) in FIG.

It is a main object of the present invention to provide a surveillance camera capable of reducing false alarms caused by foreign matter or light such as rainwater.

The surveillance camera according to the present invention includes a housing having a face portion disposed on the front surface so as to transmit light incident from the outside, a camera disposed in the housing and photographing an image of an external subject with light incident through the face portion; And an extension part extending toward the front from which the light is incident at one end of the housing, and an induction part extending from an end of the extension part to be bent toward the rear of the housing. And an zoom lens for adjusting a focal length so that the incident light is imaged on the imaging device.

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In the present invention, the extension may be extended to a length that does not appear in the image of the camera when the camera photographs the subject in the minimum zoom state.

In the present invention, the length T of the extension part is T ≦ W * (f / d), W is the length of the horizontal width of the subject, f is the focal length at the minimum zoom state of the zoom lens, and d is It is the length of the width of the image pickup device (* denotes multiplication).

In the present invention, the extension may be integrally formed with the housing.

In the present invention, the extension may be formed separately from the housing and coupled to the housing.

In the present invention, the induction part may be integrally formed with the extension part.

In the present invention, the induction part may be formed separately from the extension part and may be coupled to the induction part.

In the present invention, the extension may be made of a black material.

In the present invention, the extension may be painted in black.

In the present invention, the guide portion may be bent again toward the rear of the housing at the bent end of the guide portion.

In the present invention, the guide portion may be bent perpendicularly to the extension at the end of the extension.

The present invention extends to the maximum from the face of the surveillance camera to the maximum to prevent false alarms due to light incident in a specific direction, through the induction to prevent snow, rainwater and other foreign matter on the face to reduce false alarms.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention shown in the accompanying drawings. But. The present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity, and the elements denoted by the same reference numerals in the drawings are the same elements.

3 is a perspective view illustrating a surveillance camera 100 according to an exemplary embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a minimum zoom state of a zoom lens in the surveillance camera of FIG. 3. Is a diagram schematically illustrating a relationship between the length of the extension and the focal length of the lens.

3 and 4, the surveillance camera 100 according to an embodiment of the present invention includes a housing 101, a camera 106, an extension 102, and an induction 103.

The housing 101 forms the exterior of the surveillance camera 100, in which the camera 106 and other components are embedded. The housing 101 may have a rectangular parallelepiped shape as shown in FIG. 3, but is not limited thereto. The housing 101 may be formed in a cylindrical shape or an elliptical shape, and may have a space therein so that the camera 106 and other parts may be embedded therein. It may be made of various other shapes provided.

The front surface of the housing 101 is open. Light is incident from the outside of the surveillance camera 100 through the front surface of the housing 101. The front face 107 may be installed on the front surface. The face 107 serves to prevent rainwater and other foreign matter from entering the housing 101 from the outside of the surveillance camera 100. Since light is transmitted through the front surface of the housing 101, the face portion 107 is made of a transparent material. The face portion 107 may be formed of transparent plastic or glass.

The housing 101 is preferably made of a rigid material because it protects the camera 106 and other components embedded therein. It may be formed as a synthetic resin or metal material such as plastic.

The camera 106 is disposed inside the housing 101 as described above, and captures an image with light incident from the face part 107. The camera 106 includes a zoom lens 104 and an imaging unit 105.

The zoom lens 104 is composed of a plurality of lenses. The zoom lens 104 may adjust the focal length by changing the distance between the plurality of lenses.

The imaging unit 105 includes an imaging device 105d for converting light incident through the zoom lens 104 into an electrical signal. In general, a charge coupled device (CCD) may be used as the imaging device.

The extension part 102 extends a predetermined length toward the front from which light is incident from the outside at one end of the housing 101 where the face part 107 is disposed. Unlike the sun shield 14 of the conventional surveillance camera 10 (refer to FIG. 1), the extension 102 is formed to extend to a predetermined length not only on the upper surface of the housing 101 but also on the side and the lower surface thereof. Accordingly, light incident in a specific direction during the monitoring activity of the surveillance camera 100 may be prevented from being generated by the zoom lens 104 due to a false alarm.

3 and 4 show that the extension portion 102 is formed separately from the housing 101 and coupled to one end of the housing 101, but the present invention is not limited thereto, and the extension portion 102 may include the housing 101. It may be formed integrally with). That is, the extension 102 may be integrally formed of the same material as the housing 101. In this case, the division of the extension part 102 and the housing 101 is made by the face part 107. That is, when the extension part 102 and the housing 101 are integrally formed, a portion formed in front of the face part 107 may correspond to the extension part 102.

The extension part 102 may be made of a material representing black, and may be painted in black when it is made of a material other than black. The extension part 102 may be black to absorb light incident in a specific direction, thereby preventing light scattering, thereby preventing false alarms.

5 is a diagram schematically illustrating a relationship between a length of an extension and a focal length of a lens when the zoom lens is in the minimum zoom state in the surveillance camera of FIG. 3.

Referring to FIG. 5, the length T of the extension part 102 may be extended to a range where the extension part 102 does not appear in an image photographed by the camera 106 when the zoom lens 104 is in the minimum zoom state. Do. More specifically, when the zoom lens 104 is in the minimum zoom state, it means a state in which an image of the subject 110 that is closest to the surveillance camera 100 can be included in the image. Referring to FIG. 5, the subject 110 is close to a distance at which the surveillance camera 100 can shoot at the minimum zoom state, and thus, the extension 102 may extend to a position where the subject 110 is located. The extension 102 is not photographed by the camera 106. If the length of the extension 102 extends longer than the distance at which the subject 110 is located, the extension 102 may be photographed by the camera 106 to reduce the surveillance area of the surveillance camera 100.

Therefore, the extension 102 may extend to a length T in which the extension 102 does not appear in the image of the camera 106 when the zoom lens 104 is in the minimum zoom state. More specifically, the length T of the extension 102 is

Lt; / RTI > Where L is the distance from the center of the lens 104a to the subject 110, L 'is the length from the lens 104a to the face portion 107, W is the horizontal width of the subject 110, f is the zoom lens 104 Is the horizontal width of the image pickup device 105d when () is the minimum zoom state.

Equation 1 is obtained by using two similar triangles ABC and ADE on the left and right of the lens 104a in FIG. 5. More specifically, the triangle ABC connecting the center of the lens 104a and the two end points of the subject 110 and the triangle ADE connecting the center of the lens 104a and the width of the imaging device 105a are Since the shape is similar, the ratio (W: L) of the length W of the width of the subject 110 and the distance from the center of the lens 104a to the subject W is the length d of the width of the imaging device 105d. And the ratio f: d of the focal length of the lens 104a. In other words,

to be.

Since the length T of the extension part 102 may be equal to or smaller than the distance L from the center of the lens 104a to the subject 110 minus the length L 'to the face part 107. The length T of the part 102 is

to be.

Therefore, if L is obtained from Equation 2 and then L is substituted into Equation 3, the length T of the extension 102 as shown in Equation 1 can be obtained.

The induction part 103 is formed to be bent toward the rear of the housing 101 at the end of the extension part 102. The induction part 103 may be bent perpendicularly to the extension part 102 at the end of the extension part 102. In addition, as shown in FIG. 3, the induction part 103 may be bent twice. In other words, the induction part 103 may be bent once at the end of the extension 102 and again bent toward the housing 101 at the end of the bent part.

3 and 4, the induction part 103 includes a first induction part 103a bent from an upper surface of the extension part 102 and second and third induction parts 103b bent from both sides of the extension part 102. , 103c). Since the induction part 103 is bent toward the rear of the housing 101 at the end of the extension part 102, the surveillance camera 100 is installed outdoors so that the rainwater is the end of the extension part 102 in the housing 101. When it flows down to the flow through the induction part 103 is to flow down to the surveillance camera 100. Accordingly, rainwater can be prevented from flowing to the inside of the extension part 103 and forming on the face part 107. As described above, the induction part 102 may prevent foreign matters such as rainwater from flowing into the face part 107 to reduce false alarms caused by the foreign matter of the face part 107.

The induction part 103 may be formed integrally with the extension part 102. Alternatively, the induction part 103 may be formed separately from the extension part 102 and attached to the end of the extension part 102.

1 is a perspective perspective view of a conventional camera.

2 is a photograph showing an example of a false alarm occurring in a conventional camera.

3 is a perspective view showing an audit camera according to an embodiment of the present invention.

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a plan view schematically illustrating a case where a zoom lens is in a minimum zoom state in the surveillance camera of FIG. 3.

<Description of the symbols for the main parts of the drawings>

100: surveillance camera 101: housing

102: extension portion 103: induction portion

104: lens module 105: imaging unit

106: camera

Claims (12)

A housing having a face portion disposed on the front surface to transmit light incident from the outside; A camera disposed in the housing and capturing an image with light incident through the face part; An extension part extending from one end of the housing; And And an induction part bent at an end of the extension part. The camera, An imaging device for converting the incident light into an electrical signal; And And a zoom lens for adjusting a focal length so that the incident light is imaged on the image pickup device. delete The method of claim 1, And the extension unit extends the length of the extension unit to a length that does not appear in the image of the camera when the camera photographs a subject existing outside the camera in the minimum zoom state. The method of claim 3, The length of the extension T is T, the length of the horizontal width of the subject is W, the focal length at the minimum zoom state of the zoom lens is f, and the length of the width of the image pickup device is d, T, W, f , d is a surveillance camera that satisfies the relationship of the following equation (4).

Claim 5 was abandoned upon payment of a set-up fee. The method of claim 1, The extension camera is formed integrally with the housing. Claim 6 has been abandoned due to the setting registration fee. The method of claim 1, And the extension part is formed separately from the housing and is coupled to the housing. Claim 7 was abandoned upon payment of a set-up fee. The method of claim 1, The induction part is a surveillance camera formed integrally with the extension. Claim 8 was abandoned when the registration fee was paid. The method of claim 1, The induction part is formed separately from the extension part surveillance camera coupled to the induction part. Claim 9 has been abandoned due to the setting registration fee. The method of claim 1, The extension is a surveillance camera made of a black material. Claim 10 has been abandoned due to the setting registration fee. The method of claim 1, The extension camera is painted in black. The method of claim 1, And the induction part is bent toward the rear of the housing at the bent end of the induction part. The method of claim 1, And the induction part is bent perpendicularly to the extension part at the end of the extension part.

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