Low-power-consumption infrared dome camera

Abstract

The utility model discloses a low power consumption infrared dome camera, which comprises an outer shell, a lens assembly and a PIR detection module, the lens assembly is movably arranged inside the lower part of the outer shell, a front cover is arranged in front of a camera lens in the lens assembly, and a lens window over against the camera lens is arranged in the middle of the front cover. Light supplementing windows are arranged on two sides of the lens window; the PIR detection module comprises a PIR lens and a PIR sensor, the PIR lens is installed below a lens window on the front cover, the PIR sensor and the PIR lens are arranged at an interval, the PIR sensor outputs a detection signal after detecting correspondence of a monitored scene, and the signal processing unit determines that an object of the detection signal is a living body and is located in the monitored scene, and then the PIR lens is connected with the PIR sensor. A camera lens in the lens assembly obtains an image sequence. According to the utility model, the PIR lens and the PIR sensor are integrated and designed into the PIR detection module, and the PIR detection module is located below the camera lens and can be effectively applied to low-power-consumption and long-distance rapid snapshot scenes.

Description

Technical Field

[0001] The utility model relates to a ball camera technology, in particular to a low-power consumption infrared ball camera. Background Art

[0002] The existing cameras with PIR detection function have a short detection distance, and PIR is easily disturbed by the environment such as sunlight, resulting in a large number of false alarms. Summary of the invention

[0003] Purpose of the invention: The purpose of the utility model is to solve the deficiencies in the prior art and to provide: a low-power infrared dome camera that increases the detection distance and reduces the effect of sunlight interference by adjusting the structure and position of the lens and the PIR detection module.

[0004] Technical solution: The utility model discloses a low-power infrared dome camera, comprising an outer shell, a lens assembly and a PIR detection module. The lens assembly is movably installed inside the lower part of the outer shell. A front cover is arranged in front of the camera lens in the lens assembly. A lens window facing the camera lens is arranged in the middle of the front cover, and fill light windows are arranged on both sides of the lens window. The PIR detection module comprises a PIR lens and a PIR sensor. The PIR lens is installed below the lens window on the front cover. The PIR sensor and the PIR lens are arranged at intervals. The distance H between the PIR lens and the PIR sensor is H=20±0.15mm. The value of the distance H between the two is related to the detection distance. The smaller H is, the closer the detection distance is. The PIR sensor outputs a detection signal after detecting the corresponding monitoring scene. After the signal processing unit (here the signal processing unit can be an existing model in the prior art) determines that the object is a living body and is already in the monitoring scene, the camera lens in the lens assembly acquires an image sequence.

[0005] Furthermore, the PIR lens is in the shape of a rectangular parallelepiped as a whole and its four edges and corners are set as arc chamfers. The outward side surface of the rectangular parallelepiped PIR lens is set as an arc-shaped PIR optical surface, and the PIR optical surface protrudes from the front cover surface (that is, the curved surface corresponding to the PIR optical surface protrudes along the direction in which the optical axis of the camera lens extends). The radius of the arc segment of the PIR optical surface is R, R=80±0.15mm (it can prevent R from protruding too much and causing easy collision and deformation). The arc-shaped setting here can ensure the detection accuracy of the PIR module and reduce the interference of sunlight on the PIR module; a PIR detection surface is also provided on the rectangular parallelepiped PIR lens, the forward length of the PIR detection surface is L=31±0.15mm, and the width of the PIR detection surface is D=23±0.15mm.

[0006] Furthermore, according to the detection principle of PIR, in order to maximize the effective range of coordinated detection with the camera lens, the detection direction of the lens requires that the normal of the PIR detection surface is parallel to the lens direction; when the camera is installed at a height of 5m and tilted at 20 degrees, the maximum detection distance is 15m, and H is 20mm.

[0007] Furthermore, the lens window and the fill light window are both made of glass, the lens window is circular and its diameter is larger than the diameter of the camera lens, the lens window is arc-shaped and protrudes from the surface of the camera front shell, the fill light window is cylindrical as a whole, and the length of the fill light window is slightly larger than the diameter of the camera lens.

[0008] Furthermore, a sunshade eave is provided above the top of the PIR detection module, and the length range of the sunshade eave is 33±0.15mm and the width range is 8±0.15mm.

[0009] Beneficial effect: The utility model integrates a PIR lens and a PIR sensor into a PIR detection module. The PIR detection module is located below the camera lens and can be effectively applied to low-power, long-distance fast capture scenes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the position of the PIR detection module and the lens window in the utility model;

[0012] Figure 3 This is a schematic diagram of the structure of the PIR detection module in the utility model;

[0013] Figure 4 This is a schematic diagram of the effective detection area of ​​the PIR detection module in the present utility model;

[0014] Figure 5 It is a side view of the PIR optical surface of the PIR detection lens in the utility model;

[0015] Figure 6 Schematic diagram of a PIR detection surface formed in an embodiment;

[0016] Figure 7 Schematic diagram of the arc segment of the PIR optical surface in the embodiment. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is described in detail below, but the protection scope of the utility model is not limited to the embodiments.

[0018] like Figure 1 and Figure 2As shown, the low-power infrared dome camera of the utility model comprises an outer shell 5, a lens assembly and a PIR detection module 4. The lens assembly is movably installed inside the lower part of the outer shell 5. A front cover is arranged in front of the camera lens in the lens assembly. A lens window 1 facing the camera lens is arranged in the middle of the front cover. Filling light windows 2 are arranged on both sides of the lens window 1. The PIR detection module 4 comprises a PIR lens 41 and a PIR sensor 42. The PIR lens 41 is installed below the lens window 1 on the front cover. The PIR sensor 42 and the PIR lens 41 are connected to each other. The distance between the PIR lens 41 and the PIR sensor 42 is H=20±0.15mm, where the distance H between the two is related to the detection distance. The smaller H is, the closer the detection distance is. For example, when the camera is installed at a height of 5m and tilted at 20 degrees, the maximum detection distance is 15m, and H is set to 20mm. The PIR sensor 42 outputs a detection signal after detecting the corresponding monitoring scene. After the signal processing unit determines that the object is a living body and is already in the monitoring scene, the camera lens in the lens assembly acquires an image sequence.

[0019] like Figure 3 and Figure 4 As shown, the PIR lens 41 of this embodiment is in the shape of a rectangular parallelepiped as a whole, and its four corners are set as arc chamfers. The side surface facing outward on the rectangular parallelepiped PIR lens 41 is set as an arc-shaped PIR optical surface, and the PIR optical surface protrudes from the surface of the front cover. The radius of the arc segment of the PIR optical surface is R( Figure 7 As shown), R = 80 ± 0.15 mm, the requirement of the cylindrical radius here is to ensure the detection accuracy of the PIR module and reduce the interference of sunlight on the PIR module; a PIR detection surface is also provided on the rectangular PIR lens 41, the forward length of the PIR detection surface is L = 31 ± 0.15 mm, and the width of the PIR detection surface is D = 23 ± 0.15 mm, as shown Figure 6 shown.

[0020] like Figure 4 and Figure 5 As shown, in this embodiment, the projection cross section of the PIR lens 41 includes an arc segment with a radius R, and the area defined by the arc segment is used to transmit the infrared radiation received by the PIR sensor 42, forming a corresponding effective detection area ( Figure 4 The shadowed part in the figure), the motion information of objects with heat sources within a certain range can be detected through the effective detection area; the projection cross section of the PIR lens 41 is a rectangle with rounded corners.

[0021] like Figure 2 and Figure 3 As shown, according to the detection principle of PIR and the detection direction of the camera lens, in order to maximize the effective range of cooperative detection with the camera lens, the normal direction of the PIR detection surface in this embodiment must be parallel to the direction of the lens.

[0022] In this embodiment, the lens window 1 and the fill light window 2 are both made of glass. The lens window 1 is circular and its diameter is larger than the diameter of the camera lens. The fill light window 2 is cylindrical and its length is slightly larger than the diameter of the camera lens. In order to reduce the influence of light and shadow on the lens, a sunshade eaves 3 is provided above the top of the PIR detection module 4.

[0023] In this embodiment, the PIR lens 41 and the PIR sensor 42 are integrated into a PIR detection module 4. The PIR detection module 4 is located below the camera lens and can be effectively applied to low-power, long-distance fast capture scenes. Further, the infrared dome camera of the utility model can be combined with a waveform filtering method based on a BSP algorithm to effectively reduce false alarms caused by disturbing scenes such as tree shaking and water flow. For example, if no human activity is detected within a certain period of time, the entire device and system are in a dormant state. Once the PIR sensor 42 detects human activity, it will start quickly to achieve low power consumption.

Claims

1. A low-power infrared dome camera, characterized in that: The invention comprises an outer shell, a lens assembly and a PIR detection module. The lens assembly is movably installed inside the lower part of the outer shell. A front cover is arranged in front of a camera lens in the lens assembly. A lens window facing the camera lens is arranged in the middle of the front cover, and fill light windows are arranged on both sides of the lens window. The PIR detection module comprises a PIR lens and a PIR sensor. The PIR lens is installed below the lens window on the front cover. The PIR sensor and the PIR lens are arranged at intervals, and the distance between the PIR lens and the PIR sensor is H=20±0.15mm. The PIR sensor outputs a detection signal after detecting the corresponding monitoring scene. After the signal processing unit determines that the object of the detection signal is a living body and has been in the monitoring scene, the camera lens in the lens assembly acquires an image sequence.

2. The low-power infrared dome camera according to claim 1, characterized in that: The PIR lens is in a rectangular shape as a whole and its four corners are set as arc chamfers. The outward side of the rectangular PIR lens is set as an arc-shaped PIR optical surface, and the PIR optical surface protrudes from the surface of the front cover. The radius of the arc segment of the PIR optical surface is R, R=80±0.15mm; a PIR detection surface is also provided on the rectangular PIR lens, the forward length of the PIR detection surface is L=31±0.15mm, and the width of the PIR detection surface is D=23±0.15mm.

3. The low-power consumption infrared dome camera according to claim 2, characterized in that: The normal direction of the PIR detection surface is parallel to the direction of the camera lens.

4. The low-power consumption infrared dome camera according to claim 1, characterized in that: The lens window and the fill light window are both made of glass. The lens window is circular and its diameter is larger than the diameter of the camera lens. The lens window is arc-shaped and protrudes from the surface of the camera front shell. The fill light window is cylindrical as a whole, and its length is slightly larger than the diameter of the camera lens.

5. The low-power consumption infrared dome camera according to claim 1, characterized in that: A sunshade eave is arranged above the top of the PIR detection module, and the length range of the sunshade eave is 33±0.15mm and the width range is 8±0.15mm.

Images