CN210143227U - Camera electromagnetic shielding device - Google Patents
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- CN210143227U CN210143227U CN201920852869.7U CN201920852869U CN210143227U CN 210143227 U CN210143227 U CN 210143227U CN 201920852869 U CN201920852869 U CN 201920852869U CN 210143227 U CN210143227 U CN 210143227U
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Abstract
The utility model provides a camera electromagnetic shielding device, which comprises a metal shielding shell, a camera body, a power filter, a communication control module and a waveguide tube view finding component, wherein the camera body, the power filter and the communication control module are arranged in the metal shielding shell; the waveguide tube view finding assembly comprises a first waveguide tube and a lens assembly, wherein the first waveguide tube is arranged in the view finding hole and is in conductive connection with the metal shielding shell; the first end of the first waveguide tube is positioned outside the metal shielding shell, the opposite second end of the first waveguide tube is positioned inside the metal shielding shell and positioned on the front side of the lens of the camera body, and the first waveguide tube, the lens assembly and the lens of the camera body are coaxial; the lens assembly includes a concave lens and a convex lens. The utility model relates to a camera electromagnetic shield device effectively suppresses the electromagnetic interference radiation of camera to the electromagnetic shield efficiency that improves the camera by a wide margin, makes ordinary camera commonly used can be applied to large-scale radio telescope etc. and require high job site to equipment electromagnetic compatibility.
Description
Technical Field
The utility model belongs to the technical field of electromagnetic interference handles, specifically a camera electromagnetic shielding device.
Background
Digital image acquisition equipment such as digital cameras, video cameras and video monitoring devices are used as electronic devices, and weak electromagnetic interference radiation exists to the outside during work. Although the intensity of such weak-current devices is weak, when the large radio telescope is around the large radio telescope or works on site, the electromagnetic interference of devices such as a camera affects the observation result of the large radio telescope because the large radio telescope has the function of collecting and amplifying electromagnetic signals. The large radio telescope is used as a large space structure project, image acquisition equipment such as a camera and the like cannot be separated in observation control, operation maintenance and field monitoring, and due to special application occasions and requirements, no clear solution is provided at present for the problem, a high-end weak interference camera is usually selected for an electromagnetic interference shielding measure of the camera or a metal shell is used for covering a camera body as much as possible so as to reduce external electromagnetic radiation, and the installation and the layout of the equipment such as the camera and the like are required to be reduced as much as possible, and the equipment can only be used at a key position.
The camera is used as an optical measuring device, an optical path exists between work requirement and a measured scene, common electronic equipment can completely cover the electronic equipment by using a metal shell to inhibit external electromagnetic radiation, but a certain view finding hole is reserved on the camera, so that the shell airtightness cannot be realized, electromagnetic wave leakage can still be caused when the hole area is too large, the shielding efficiency is low, and the multi-rotation view finding function is lacked. Although the high-end camera has strong electromagnetic compatibility, the shielding efficiency of the high-end camera is still limited, the high-end camera is mainly used for preventing external electromagnetic interference from entering the camera, and the high-end camera is expensive, so that the application of a large radio telescope field video monitoring system is limited.
SUMMERY OF THE UTILITY MODEL
The utility model provides a camera electromagnetic shielding device, electromagnetic shielding effectiveness to improving the camera by a wide margin effectively restraines the electromagnetic interference radiation of camera, makes ordinary camera commonly used can be applied to large-scale radio telescope etc. and requires high job site to equipment electromagnetic compatibility.
In order to solve the technical problem, the utility model adopts the following technical scheme to realize: a camera electromagnetic shielding device comprises a metal shielding shell, a camera body, a power supply filter, a communication control module and a waveguide tube view finding assembly, wherein the camera body, the power supply filter and the communication control module are arranged in the metal shielding shell, the metal shielding is provided with a power supply wire hole and a view finding hole, the camera body and the power supply filter as well as the camera body and the communication control module are connected through wires, a power supply wire of the power supply filter and a communication wire of the communication control module are integrated into a wire harness, and the wire harness is led out of the metal shielding shell through the power supply wire hole; the waveguide tube view finding assembly comprises a first waveguide tube arranged horizontally and a lens assembly arranged in the first waveguide tube, and the first waveguide tube is arranged in the view finding hole and is in conductive connection with the metal shielding shell; the first end of the first waveguide tube is positioned outside the metal shielding shell, the opposite second end of the first waveguide tube is positioned inside the metal shielding shell and positioned on the front side of the lens of the camera body, and the first waveguide tube, the lens assembly and the lens of the camera body are coaxial; the lens assembly includes a concave lens at a first end of the first waveguide and a convex lens at a second end of the first waveguide.
The number of the concave lenses is multiple, and the concave lenses are sequentially arranged at intervals along the axis of the first waveguide tube.
A first internal shielding chamber is formed in the metal shielding shell, and the first internal shielding chamber is fixedly arranged on the inner wall of the metal shielding shell and is in conductive connection with the metal shielding shell; the power filter with the communication control module is located in the first internal shielding room, the first internal shielding room with the power cord hole intercommunication, just be provided with on the first internal shielding room and be used for making the camera body with connecting wire between the power filter and the camera body with the wire guide that connecting wire between the communication control module passes through, the wire guide disposes the second waveguide.
The power cord hole is configured with a third waveguide, the wire harness is wrapped with a metal outer layer, and the metal outer layer is grounded and connected with the third waveguide.
The camera support is fixedly arranged in the metal shielding shell and provided with a horizontal supporting part, and the camera body is supported on the horizontal supporting part.
The camera body is in sliding fit with the guide rail and can be positioned on the horizontal supporting part.
The camera electromagnetic shielding device also comprises a rotating mechanism, wherein the rotating mechanism comprises a supporting column, a stepping motor, a connecting shaft and a circular metal turntable; the metal rotary table is fixedly arranged on the bottom surface of the metal shielding shell and is in conductive connection with the metal shielding shell, the supporting column is provided with a circular supporting table positioned at the top end of the supporting column, the circumferential edge of the supporting table is provided with a circumferential convex edge protruding upwards, the metal rotary table is positioned on the supporting table and positioned in a space surrounded by the circumferential convex edge, and the metal rotary table, the supporting column, the stepping motor and the connecting shaft are coaxial; the metal shielding shell with all be equipped with the confession on the metal carousel the through-hole that the connecting axle passed, connecting axle one end with the supporting station links firmly, and the other end warp the through-hole with step motor's motor shaft links firmly, step motor is located inside and its main part of metal shielding shell with metal shielding shell links firmly as an organic whole, step motor's power cord connect in power filter.
A second internal shielding chamber is formed in the metal shielding shell, and the second internal shielding chamber is fixedly arranged on the inner wall of the metal shielding shell and is in conductive connection with the metal shielding shell; the step motor is located in the second internal shielding chamber, the second internal shielding chamber with the through-hole intercommunication, just be provided with on the second internal shielding chamber and be used for making step motor's power cord passes through the through wires hole, the through wires hole disposes the fourth wave guide pipe.
The bearing table is provided with a circle of guide grooves, a plurality of balls are arranged in the guide grooves, and the bottom surface of the metal turntable is provided with a turntable guide groove in sliding fit with the balls.
The bottom surface of the metal shielding shell is also provided with a circle of L-shaped metal flanges, the L-shaped metal flanges surround the supporting table, and the horizontal parts of the L-shaped metal flanges are positioned below the circumferential edge of the supporting table.
Compared with the prior art, the utility model has the advantages of it is following and positive effect: the utility model discloses use metal shield casing encapsulation camera equipment, and the view finding hole of reserving on the metal shield casing is through the waveguide pipe view finding subassembly that configuration first waveguide pipe and lens constitute, for the inside camera is looked a view and is provided the optical path, under the circumstances that the assurance inside camera can be looked a view, effective electromagnetic shield can be realized to first waveguide pipe, and lens combination can realize looking a view through the wide-angle of narrow and thin pipeline, then the utility model discloses can effectively shield the suppression to camera electromagnetic interference, reduce its electromagnetic radiation interference by a wide margin, make ordinary camera can work and use in the place that requires high to the electromagnetic compatibility performance, and possess good electromagnetic shielding performance; according to different requirements of electromagnetic shielding effectiveness and different main frequency bands of electromagnetic interference radiated by camera equipment, the thickness of the metal shielding shell and the size of the first waveguide tube can be correspondingly changed, and the number, the position and the focal length of the lens can be adjusted to meet the requirements of the electromagnetic shielding effectiveness and the optical path.
Drawings
Fig. 1 is a schematic structural view of the electromagnetic shielding device of the camera of the present invention;
fig. 2 is a schematic top view of the supporting table of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the description of the present invention, the terms of the directions or the positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", and the like are defined based on the use state of the camera body, and when the camera body captures an image, an object is located on the front side of the lens thereof, and correspondingly, the other side is the rear side thereof. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 and fig. 2, the camera electromagnetic shielding device of the present embodiment includes a metallic shielding case 100, a camera body 200, a power filter 300, a communication control module 400 and a waveguide view finding assembly 500, wherein the camera body 200, the power filter 300 and the communication control module 400 are disposed in the metallic shielding case 100, the metallic shielding case 100 is provided with a power line hole 110 and a view finding hole 120, the camera body 200 is connected with the power filter 300 through a wire, the camera body 200 is connected with the communication control module 400 through a wire, a power line of the power filter 300 and a communication line of the communication control module 400 are integrated into a wire harness 600, and the wire harness 600 is led out of the metallic shielding case 100 through the power line hole 110 so as to connect to a corresponding interface; the waveguide tube view finding assembly 500 comprises a first waveguide tube 510 horizontally arranged and a lens assembly 520 arranged inside the first waveguide tube 510, wherein the first waveguide tube 510 is installed in the view finding hole 120, and the first waveguide tube 510 is tightly attached to the inner wall of the view finding hole 120 to form a tight metallic connection, so that the first waveguide tube 510 and the metal shielding shell 100 have good electric conductivity, for example, the first waveguide tube 510 can be tightly attached to and installed in the view finding hole 120 by welding; the first end 511 of the first waveguide 510 is located outside the metal shielding shell 100, the opposite second end 512 is located inside the metal shielding shell 10 and in front of the lens 210 of the camera body 200, and the first waveguide 510 and the lens assembly 520 are coaxial with the lens 210 of the camera body 200; the lens assembly 520 includes a concave lens 521 at the first end 511 of the first waveguide 510 and a convex lens 522 at the second end 512 of the first waveguide 510.
In this embodiment, the camera body 200 is packaged by using the metal shielding case 100, and the view-finding hole 120 reserved on the metal shielding case 100 is provided with the waveguide view-finding component 500 formed by the first waveguide 510 and the lens component 520, so as to provide an optical path for the view-finding of the internal camera body 200, under the condition that the view-finding of the internal camera body 200 is ensured, the first waveguide 510 can realize effective electromagnetic shielding, and the lens component 520 can realize wide-angle view-finding through a narrow pipeline, so that the embodiment can effectively shield and suppress electromagnetic interference of the camera, greatly reduce electromagnetic radiation interference thereof, enable the common camera to work and use in a place with extremely high requirement on electromagnetic compatibility, and have good electromagnetic shielding performance; according to the different requirements of the electromagnetic shielding effectiveness and the different main frequency bands of the electromagnetic interference radiated by the camera device, the thickness of the metal shielding case 100 and the size of the first waveguide 510 can be changed correspondingly, and the number, position and focal length of the lenses can be adjusted to meet the requirements of the electromagnetic shielding effectiveness and the optical path.
Specifically, as shown in fig. 1, the metal shield case 100 completely encloses and covers the entire camera body 200 and must be effectively grounded. According to the electromagnetic field theory, the shielding effectiveness of the material is mainly the superposition of the absorption loss A and the reflection loss R, and the simplified formula of the shielding effectiveness is as follows: SE = a + r (db).
Wherein A is the material absorption loss, and the calculation formula is as follows: a =3.34t (f μ σ) (dB), t being the thickness of the shielding material, μ being the magnetic permeability of the shielding material, σ being the electrical conductivity of the shielding material, and f being the frequency of the incident electromagnetic wave.
R is the reflection loss of the shielding material, the electromagnetic wave is reflected when being transmitted and incident to different medium interface surfaces, and the calculation formula is as follows: r =20lg (Z)W/ZS) (dB)，ZWFor the wave impedance, Z, of the electromagnetic wave encountering the interface of the mediumSFor the properties of the shielding material itselfImpedance.
Therefore, when the material of the metal shielding shell 100 is constant, the reflection loss, the magnetic permeability and the electrical conductivity of the metal shielding shell 100 are constant values, and the shielding effectiveness of the metal shielding shell 100 for electromagnetic waves of different frequencies is to be improved, and the thickness of the metal shielding shell 100 is to be increased.
The metal shielding shell 100 should be provided with a metal door at a side edge, the door is required to be opened conveniently so as to facilitate installation and maintenance of equipment, and the material and thickness of the door are consistent with those of the metal shielding shell 100. The four sides of the closed door are required to be in close metallic seamless connection with the metal shielding shell 100, and the door can be realized by adopting methods such as metal pad or slot combination, and the buckling position of the door and the metal shielding shell 100 is provided with a convex-concave alternate structure to form multiple zigzag curve buckling.
The waveguide view finding assembly 500 is a combination of a first waveguide 510 and a lens assembly 520, the first waveguide 510 is a metal circular tube structure with a certain length and a tube wall thickness, the first waveguide 510 is tightly attached to the view finding hole 120 of the metal shielding shell 100, so that the first waveguide 510 and the metal shielding shell 100 have good conductivity to conduct electricity smoothly, and no gap exists between the first waveguide 510 and the metal shielding shell 100 to avoid electromagnetic leakage; the lens assembly 520 conducts external light, a concave lens 521 is arranged at a first end 511 of the first waveguide 510 positioned outside the metal shielding shell 100 and serves as an objective lens, a convex lens 522 is arranged at a second end 512 of the first waveguide 510 positioned inside the metal shielding shell 100 and serves as an eyepiece lens, the concave lens 521 is arranged at the front side of the lens 210 of the camera body 200, and the concave lens 521 is preferably a convex-concave lens protruding outwards, so that view finding with a wide view field can be achieved, and external measured scene light can be effectively transmitted to the lens 210 of the internal camera body 200. According to the change of the length and the pipe diameter of the first waveguide 510, the number of the concave lenses 521 can be properly changed, the positions of the lenses can be changed, the focal length of the lenses can be adjusted, and the incident conduction of the scene light can be ensured.
The waveguide has a high-pass filtering characteristic in electromagnetic wave conduction, and when the frequency of the electromagnetic wave is lower than the cutoff frequency of the waveguide, the electromagnetic wave is attenuated in the waveguide and is suppressed. The cutoff frequency calculation formula of the circular waveguide tube is as follows:
f0=17.6×109/d(Hz)；
in the formula f0D is the diameter of the cross section of the circular waveguide in cm for the cut-off frequency. For example, the cutoff frequency is 17.6GHz when the diameter of the waveguide is 1 cm. The shielding effectiveness of the single-hole circular waveguide tube is mainly the sum of the absorption loss A of the cut-off waveguide and the reflection loss R of the hole: SE = a + r (db).
Wherein, R is the reflection loss of the circular waveguide tube hole, a is the absorption loss of the circular waveguide tube hole, and in the engineering, to ensure the waveguide tube to have a large attenuation to the electromagnetic wave, the cut-off frequency of the waveguide tube is usually 5 times or more of the frequency of the electromagnetic wave to be shielded, and when this condition is satisfied, the absorption loss of the circular waveguide tube with the length T and the diameter d is: a ≈ 32T/d (dB). Therefore, under the condition that other parameters are inconvenient, the shielding effectiveness of the waveguide can be effectively improved by reducing the pipe diameter d of the waveguide or increasing the length T of the waveguide.
In designing and selecting, the length of the circular waveguide tube is generally required to be more than 3 times of the diameter, and the material and thickness of the tube wall also have a certain influence on the electromagnetic shielding performance of the waveguide tube, because the position of the waveguide tube adopted in the embodiment is a single-hole structure, the tube wall is thickened without adverse effect, and it is recommended that the material performance of the first waveguide tube 510 is not lower than the performance of the metal shielding shell 100 itself, and the thickness of the tube wall of the first waveguide tube 510 is not lower than the thickness of the metal shielding shell 100. In practice, the inner lens element 520 may be made of conductive glass to further improve shielding effectiveness if the materials and optical properties allow it.
Accordingly, for example, a combination structure of the first waveguide 510 and the lens component 520 with an inner diameter of 1cm and a length of 6cm is fully feasible in size, and can have shielding attenuation of not less than 64dB for electromagnetic waves within 3Ghz, and actually, the reflection loss of the waveguide is considered comprehensively, the shielding efficiency is only higher, while the FAST observation frequency band of the large radio telescope is between 70Mhz and 3Ghz, which can also meet the requirement of electromagnetic shielding in practical application.
Since the electromagnetic shielding device of the camera of the present embodiment can effectively shield and suppress the electromagnetic interference of the camera body 200, and greatly reduce the electromagnetic radiation interference, the camera body 200 can be used in a common camera, and can be used in a place with a high requirement on the electromagnetic compatibility.
The power filter 300 is a power filter of the camera body 200, completes power supply to the camera body 200, blocks transmission of electromagnetic waves along a line using an analog filter, and may use an analog low pass filter for a power line.
The communication control module 400 completes communication transmission to the camera body 200, and a photoelectric conversion communication module may be used for a communication line, and an optical fiber is used for transmitting a communication signal to the outside.
Further, as described above, according to the change of the length and the pipe diameter of the first waveguide 510, the number of the concave lenses 521 can be properly changed, the positions of the lenses can be changed, the focal length of the lenses can be adjusted, and the incident and transmission of the scene light can be ensured.
In order to further improve the electromagnetic shielding effect, as shown in fig. 2, a first internal shielding chamber 700 is formed in the metal shielding shell 100, the first internal shielding chamber 700 is a sealed metal structure similar to the metal shielding shell 100, and forms an independent shielding chamber, and is fixedly connected to the inner wall of the metal shielding shell 100, and the connection surface is tightly attached to the inner wall of the metal shielding shell 100, so as to form a tight metallic connection, so that the first internal shielding chamber 700 is electrically connected to the metal shielding shell 100, and has a good conductive capability therebetween, the first internal shielding chamber 700 further isolates the electromagnetic interference conduction inside and outside, and the first internal shielding chamber 700 can be fixedly connected to the inner wall of the metal shielding shell 100 by welding. The power filter 300 and the communication control module 400 are located in the first internal shielding room 700, the first internal shielding room 700 is communicated with the power line hole 110, a wire hole 710 for allowing a connecting wire between the camera body 200 and the power filter 300 and a connecting wire between the camera body 200 and the communication control module 400 to pass through is arranged on the first internal shielding room 700, and the wire hole 710 is configured with a second waveguide 720 to further enhance the electromagnetic shielding effect between the connecting gaps between the camera body 200 and the metal shielding case 100. The material, thickness, etc. of the second waveguide 720 and the shielding effectiveness are consistent with the requirements of the first waveguide 510, but in practice, the second waveguide 720 is used for threading, and the size is more freely selected, so that the waveguide can be made thinner and longer than the first waveguide 510, and the shielding effectiveness is higher.
Similarly, the power line hole 110 is configured with a third waveguide 800, the wiring harness 600 is wrapped with a metal outer layer, and the metal outer layer is grounded and is reliably connected with the third waveguide 800 when passing through the wiring harness 600, so as to prevent electromagnetic leakage caused by a gap.
As for the arrangement structure of the camera body 200 in the metal shielding case 100, in this embodiment, as shown in fig. 1, a camera support 130 is fixedly disposed inside the metal shielding case 100, the camera support 130 has a horizontal support portion 131, and the camera body 200 is supported on the horizontal support portion 131. The horizontal support portion 131 may be provided with a structure for positioning the camera body 200, such as a slot or a binding structure, so that the camera body 200 can be stably supported on the horizontal support portion 131. The camera bracket 130 is made of a metal material with good thermal conductivity, and is fixed on the inner wall of the metal shielding case 100 to provide a support and a heat dissipation for the camera body 200.
According to the view-finding requirement of the camera body 200, the position of the camera body 200 can be preferably adjusted back and forth during installation, and in order to facilitate the position adjustment, a guide rail (not shown in the view angle reason figure) extending back and forth is provided on the horizontal support part 131, the camera body 200 is in sliding fit with the guide rail, and the camera body 200 can be positioned on the horizontal support part 131.
In order to realize the angle view of the camera body 200 in different directions, the electromagnetic shielding apparatus of the camera of this embodiment further includes a rotating mechanism 900, the rotating mechanism 900 includes a supporting column 910, a stepping motor 920, a connecting shaft 930 and a circular metal turntable 940; the metal turntable 940 is fixedly arranged on the bottom surface of the metal shielding shell 100 and is tightly attached to the bottom surface of the metal shielding shell 100 so that the metal turntable 940 and the metal shielding shell 100 have good conductive capability to realize conductive connection, for example, the metal turntable 940 can be tightly connected to the bottom surface of the metal shielding shell 100 by welding; the supporting column 910 is provided with a circular supporting platform 911 at the top end thereof, the circumferential edge of the supporting platform 911 is provided with a circumferential protruding edge 912 protruding upwards, the metal rotary disc 940 is located on the supporting platform 911 and located in the space surrounded by the circumferential protruding edge 912, and the circumferential protruding edge 912 can shield the gap between the metal rotary disc 940 and the supporting platform 911 so as to inhibit the propagation of electromagnetic waves; the metal rotating disc 940, the supporting table 911, the supporting column 910, the stepping motor 920 (specifically, a motor shaft of the stepping motor 920) and the connecting shaft 930 are coaxial; both the metal shielding shell 100 and the metal turntable 940 are provided with through holes for the connection shaft 930 to pass through, one end of the connection shaft 930 is fixedly connected with the supporting platform 911, the other end is fixedly connected with the motor shaft of the stepping motor 920 through the through holes in a penetrating manner, the stepping motor 920 is positioned inside the metal shielding shell 100, the main body part (i.e., the motor body part except the motor shaft of the stepping motor 920) of the stepping motor 920 is fixedly connected with the metal shielding shell 100 into a whole, and the power line of the stepping motor 920 is connected to the power filter 300. During rotation, the stepping motor 920 works, the support column 910, the support stand 911 and the connecting shaft 930 are fixed, accordingly, the motor shaft of the stepping motor 920 does not rotate, the main body part of the stepping motor 920 rotates relative to the motor shaft, and then the metal shielding shell 100 is driven to rotate, so that each part inside the metal shielding shell 100 rotates along with the rotation, the camera main body 200 rotates, and view finding at different directions is achieved.
Similarly, in order to further improve the electromagnetic shielding effect, a second internal shielding chamber 1000 is formed in the metal shielding shell 100, the second internal shielding chamber 1000 is a sealed metal structure like the metal shielding shell 100, and forms an independent shielding cabin which is fixedly connected to the inner wall of the metal shielding shell 100, and the connecting surface is tightly attached to the inner wall of the metal shielding shell 100 to form a tight metallic connection, so that the second internal shielding chamber 1000 is electrically connected to the metal shielding shell 100, and has good conductivity between the two, the second internal shielding chamber 1000 further isolates the electromagnetic interference conduction inside and outside, and the second internal shielding chamber 1000 can be fixedly connected to the inner wall of the metal shielding shell 100 by welding. The stepping motor 920 is located in the second internal shielding chamber 1000, the second internal shielding chamber 1000 is communicated with the metal shielding shell 100 and the through hole on the metal turntable 940 through which the connecting shaft 930 passes, a threading hole for passing the power line 921 of the stepping motor 920 is formed in the second internal shielding chamber 1000, and the fourth waveguide 1100 is configured in the threading hole. The material, thickness and other parameters of the fourth waveguide 1100 and the shielding effectiveness are consistent with the requirements of the first waveguide 510, but in practice, the fourth waveguide 1100 is used for threading, and the size is more freely selected, so that a waveguide which is thinner and longer than the fourth waveguide 1100 can be selected for realization, and the shielding effectiveness is higher.
As shown in fig. 2, in order to make the supporting platform 911 have a good low-resistance rotation function while supporting the metal shielding case 100, a circle of guide groove 913 is disposed on the supporting platform 911, a plurality of balls 914 are disposed in the guide groove 913, and a turntable guide groove (not shown) slidably fitting the balls 914 is disposed on a bottom surface of the metal turntable 940, so that frictional resistance between the metal turntable 940 and the supporting platform 911 is reduced, the metal shielding case 100 rotates smoothly, and the metal turntable 940 and the metal shielding case 100 need to be attached as close as possible to reduce electromagnetic leakage caused by a gap.
Further, a ring of L-shaped metal ribs 140 is formed on the bottom surface of the metal shielding shell 100, as shown in fig. 1, the L-shaped metal ribs 140 surround the supporting platform 911 and the horizontal portion of the L-shaped metal ribs 140 is located below the circumferential edge of the supporting platform 911. The L-shaped metal rib 140 is fixed to the metal shielding shell 100 for fixing the metal shielding shell 100 to the support post 910, and the material of the L-shaped metal rib is the same as the metal shielding shell 100, the thickness requirement is not lower than that of the metal shielding shell 100, and the length of the horizontal portion of the L-shaped metal rib is not lower than 2 times of the thickness of the horizontal portion of the metal shielding shell, so that a long and narrow rectangular slot structure is formed, and the electromagnetic wave conduction through the slot can be effectively inhibited.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or that equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention, which is claimed.
Claims (10)
1. A camera electromagnetic shielding device is characterized in that: the camera body, the power filter and the communication control module are arranged in the metal shielding shell, a power line hole and a view finding hole are formed in the metal shielding shell, the camera body and the power filter as well as the camera body and the communication control module are connected through conducting wires, a power line of the power filter and a communication line of the communication control module are integrated into a wire harness, and the wire harness is led out of the metal shielding shell through the power line hole; the waveguide tube view finding assembly comprises a first waveguide tube arranged horizontally and a lens assembly arranged in the first waveguide tube, and the first waveguide tube is arranged in the view finding hole and is in conductive connection with the metal shielding shell; the first end of the first waveguide tube is positioned outside the metal shielding shell, the opposite second end of the first waveguide tube is positioned inside the metal shielding shell and positioned on the front side of the lens of the camera body, and the first waveguide tube, the lens assembly and the lens of the camera body are coaxial; the lens assembly includes a concave lens at a first end of the first waveguide and a convex lens at a second end of the first waveguide.
2. The camera electromagnetic shielding device according to claim 1, characterized in that: the number of the concave lenses is multiple, and the concave lenses are sequentially arranged at intervals along the axis of the first waveguide tube.
3. The camera electromagnetic shielding device according to claim 1, characterized in that: a first internal shielding chamber is formed in the metal shielding shell, and the first internal shielding chamber is fixedly arranged on the inner wall of the metal shielding shell and is in conductive connection with the metal shielding shell; the power filter with the communication control module is located in the first internal shielding room, the first internal shielding room with the power cord hole intercommunication, just be provided with on the first internal shielding room and be used for making the camera body with connecting wire between the power filter and the camera body with the wire guide that connecting wire between the communication control module passes through, the wire guide disposes the second waveguide.
4. The camera electromagnetic shield of claim 3, wherein: the power cord hole is configured with a third waveguide, the wire harness is wrapped with a metal outer layer, and the metal outer layer is grounded and connected with the third waveguide.
5. The camera electromagnetic shielding device according to claim 1, characterized in that: the camera support is fixedly arranged in the metal shielding shell and provided with a horizontal supporting part, and the camera body is supported on the horizontal supporting part.
6. The camera electromagnetic shield of claim 5, wherein: the camera body is in sliding fit with the guide rail and can be positioned on the horizontal supporting part.
7. The camera electromagnetic shielding device according to any one of claims 1 to 6, characterized in that: the camera electromagnetic shielding device also comprises a rotating mechanism, wherein the rotating mechanism comprises a supporting column, a stepping motor, a connecting shaft and a circular metal turntable; the metal rotary table is fixedly arranged on the bottom surface of the metal shielding shell and is in conductive connection with the metal shielding shell, the supporting column is provided with a circular supporting table positioned at the top end of the supporting column, the circumferential edge of the supporting table is provided with a circumferential convex edge protruding upwards, the metal rotary table is positioned on the supporting table and positioned in a space surrounded by the circumferential convex edge, and the metal rotary table, the supporting column, the stepping motor and the connecting shaft are coaxial; the metal shielding shell with all be equipped with the confession on the metal carousel the through-hole that the connecting axle passed, connecting axle one end with the supporting station links firmly, and the other end warp the through-hole with step motor's motor shaft links firmly, step motor is located inside and its main part of metal shielding shell with metal shielding shell links firmly as an organic whole, step motor's power cord connect in power filter.
8. The camera electromagnetic shield of claim 7, wherein: a second internal shielding chamber is formed in the metal shielding shell, and the second internal shielding chamber is fixedly arranged on the inner wall of the metal shielding shell and is in conductive connection with the metal shielding shell; the step motor is located in the second internal shielding chamber, the second internal shielding chamber with the through-hole intercommunication, just be provided with on the second internal shielding chamber and be used for making step motor's power cord passes through the through wires hole, the through wires hole disposes the fourth wave guide pipe.
9. The camera electromagnetic shield of claim 7, wherein: the bearing table is provided with a circle of guide grooves, a plurality of balls are arranged in the guide grooves, and the bottom surface of the metal turntable is provided with a turntable guide groove in sliding fit with the balls.
10. The camera electromagnetic shield of claim 7, wherein: the bottom surface of the metal shielding shell is also provided with a circle of L-shaped metal flanges, the L-shaped metal flanges surround the supporting table, and the horizontal parts of the L-shaped metal flanges are positioned below the circumferential edge of the supporting table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920852869.7U CN210143227U (en) | 2019-06-06 | 2019-06-06 | Camera electromagnetic shielding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920852869.7U CN210143227U (en) | 2019-06-06 | 2019-06-06 | Camera electromagnetic shielding device |
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| Publication Number | Publication Date |
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| CN210143227U true CN210143227U (en) | 2020-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920852869.7U Expired - Fee Related CN210143227U (en) | 2019-06-06 | 2019-06-06 | Camera electromagnetic shielding device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346195A (en) * | 2020-12-04 | 2021-02-09 | 北京拜波赫光电科技有限公司 | Lens device capable of realizing electromagnetic shielding and electromagnetic isolation |
| CN114709675A (en) * | 2021-12-13 | 2022-07-05 | 陕西航空电气有限责任公司 | Electromagnetic compatibility shielding bush of power socket |
-
2019
- 2019-06-06 CN CN201920852869.7U patent/CN210143227U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112346195A (en) * | 2020-12-04 | 2021-02-09 | 北京拜波赫光电科技有限公司 | Lens device capable of realizing electromagnetic shielding and electromagnetic isolation |
| CN114709675A (en) * | 2021-12-13 | 2022-07-05 | 陕西航空电气有限责任公司 | Electromagnetic compatibility shielding bush of power socket |
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Granted publication date: 20200313 Termination date: 20210606 |