Radiated disturbance shielding and heat dissipating structure for a camera

Abstract

The utility model provides a radiated disturbance shielding and heat radiation structure of camera, reduces the influence of the radiation emission of various high -speed video single board and mainboard in product to outside world. A radiated disturbance shielding and heat radiation structure of camera, the bottom cover of camera is equipped with the heat dissipation hole, the heat dissipation hole is the double -deck structure of inside and outside, the inner layer structure is a plurality of inner layer heat dissipation holes of distribution in proper order, the outer layer structure is the outer layer heat dissipation hole, and the outer layer heat dissipation hole covers all inner layer heat dissipation holes.

Description

Technical Field

[0001] This utility model relates to a radiation interference shielding and heat dissipation structure for a camera. Background Technology

[0002] In existing digital pan-tilt video cameras, increasingly demanding customer requirements necessitate the inclusion of various high-speed video output modules and higher video output resolutions, leading to higher overall power consumption and greater demands on heat dissipation. The original fully enclosed metal pan-tilt base cover 1 now requires the addition of various ventilation holes 2 for heat dissipation. However, with increasing customer focus on electromagnetic compatibility and the widespread demand for domestic and international certifications, coupled with the need for various high-speed video circuit boards, the radiated interference from the metal ventilation holes 2 is becoming increasingly prominent.

[0003] Currently, most pan-tilt-zoom (PTZ) digital camera products use metal for their base covers to maintain stability during PTZ rotation. Single-layer metal base covers, with their narrower and longer ventilation holes (2), are more prone to leaking internal radiation interference. However, the larger ventilation holes (2) also make it easier for foreign objects to enter the product (although this can be addressed with dust filters, the durability of which needs to be considered), and can also lead to radiation issues. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned deficiencies in the existing technology and to provide a reasonably designed radiation interference shielding and heat dissipation structure for a camera, thereby reducing the radiation emission impact of various high-speed video single boards and motherboards inside the product on the outside world.

[0005] The technical solution adopted by this utility model to solve the above problems is: a radiation interference shielding and heat dissipation structure for a camera, wherein heat dissipation holes are provided on the bottom cover of the camera, characterized in that: the heat dissipation holes are a double-layer structure, the inner layer structure consists of a number of inner heat dissipation holes distributed in sequence, and the outer layer structure consists of outer heat dissipation holes, the outer heat dissipation holes covering all the inner heat dissipation holes.

[0006] The heat dissipation holes in the inner layer of this invention are distributed sequentially at equal intervals.

[0007] The inner heat dissipation holes described in this utility model are round holes or elliptical holes.

[0008] The outer heat dissipation holes described in this utility model are elongated holes.

[0009] Compared with the prior art, this invention has the following advantages and effects: the double-layer heat dissipation hole 2 reduces the opening size, which can reduce the range of interference frequencies that can be radiated and also reduce the radiation power, thereby reducing the overall radiation leakage of the product. At the same time, the smaller heat dissipation hole 2 also prevents larger foreign objects from entering the product. When the radiation inside the product is less likely to leak out, it is also less susceptible to interference from external radiation, which improves the product's radiation immunity. Attached Figure Description

[0010] Figure 1 This is a front structural diagram of an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the rear structure of an embodiment of the present utility model.

[0012] Figure 3 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0013] Figure 4 This is a reference diagram for current transmission in an embodiment of the present invention. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0015] According to antenna theory, when the total length of an antenna is greater than 1 / 20 of the signal wavelength λ, it will effectively radiate into space. Cables, openings, and gaps in electronic devices easily meet this condition, resulting in radiated emissions. This invention aims to solve the problem of open-aperture antennas in electronic devices. Taking the HDMI clock multiplier of 891MHz as an example, 1 / 20 of its wavelength is 1.68cm. This means that an opening larger than 1.68cm can easily radiate the HDMI multiplier clock signal. For higher frequencies (such as Bluetooth 2.4GHz), 1 / 20 of the wavelength is even shorter, requiring a smaller opening size. Therefore, effectively reducing the minimum opening size of the product's metal casing will significantly reduce the product's radiated frequency range.

[0016] In this embodiment of the utility model, a heat dissipation hole 2 is provided on the bottom cover 1 of the camera.

[0017] The heat dissipation holes 2 have a double-layer structure: the inner layer, located near the motherboard or high-speed video board inside the product, consists of four inner heat dissipation holes 3, which are evenly spaced and are either circular or elliptical. The outer layer consists of outer heat dissipation holes 4, which cover all the inner heat dissipation holes 3 and are elongated. This reduces the minimum loop area of ​​a single heat dissipation hole and lowers the loop impedance of the entire heat dissipation structure, thereby reducing the overall power of the loop antenna formed by the heat dissipation structure. In addition, the smaller metal opening also reduces the frequency range that can be radiated from inside the product.

[0018] In this embodiment: the furthest distance between the two ends of the elongated hole in the outer layer structure is 12.1 mm, and the height is 2.5 mm. The inner layer structure uses four circular holes with a diameter of 2.5 mm. The overall length distribution is: 2.5 mm * 4 + 0.7 mm * 3 = 12.1 mm, meaning the spacing between the four circular holes is 0.7 mm. The minimum loop circumference of a single hole is reduced from 27.05 mm to 7.85 mm. See also... Figure 2 Assuming the impedance of the current returning to the initial point from the leftmost circular hole is 1 / 4Ω, and the impedance returning to the initial point from the rightmost circular hole is 1Ω (the initial point is the leftmost arrow of the long circular hole in the diagram), that is, the loop impedance of each long circular hole is 1Ω, and the various radiated currents absorbed by each long circular hole are 1A, then the current will generate a voltage drop of 1V when it travels around the long circular hole. With the two-layer structure, assuming that the current transmitted on each circular hole is evenly distributed, the current will generate a voltage drop of 1 / 4×1 / 4+2 / 4×1 / 4+3 / 4×1 / 4+4 / 4×1 / 4=0.625V when it travels around the two layers. That is, the original one current path has now been increased to four current paths. In reality, the current will choose the path with lower impedance more often, that is, more current will choose to go through the 1 / 4Ω circular hole. Thus, the actual voltage drop generated by the two-layer structure will be lower, which will greatly reduce the overall power of the loop antenna with heat dissipation hole 2.

[0019] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A radiation interference shielding and heat dissipation structure for a camera, wherein heat dissipation holes are provided on the bottom cover of the camera, characterized in that: The heat dissipation holes have a double-layer structure, with the inner layer consisting of several inner heat dissipation holes arranged in sequence, and the outer layer consisting of outer heat dissipation holes that cover all the inner heat dissipation holes.

2. The radiated interference shielding and heat dissipation structure for a camera according to claim 1, characterized in that: The inner heat dissipation holes are distributed sequentially at equal intervals.

3. The radiated interference shielding and heat dissipation structure for a camera according to claim 1 or 2, characterized in that: The inner heat dissipation holes are either round or elliptical.

4. The radiated interference shielding and heat dissipation structure for a camera according to claim 1, characterized in that: The outer heat dissipation holes are elongated holes.

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