A high light transmittance adaptive electromagnetic shielding device and its application

Abstract

The present invention relates to the field of electromagnetic shielding technology, specifically to a high-transmittance adaptive electromagnetic shielding device and application, including a device housing and a mounting mechanism, wherein a first transparent member, a second transparent member and a third transparent member are arranged on the mounting mechanism, both sides of the first transparent member are planes, the side of the second transparent member close to the first transparent member is a plane, the side of the second transparent member away from the first transparent member is a convex spherical surface, and the side of the third transparent member close to the second transparent member is a concave spherical surface. The beneficial effect of the present invention is that when the shielded member is observed through the shielding device, the moiré phenomenon caused by optical interference between the first electromagnetic shielding net and the second electromagnetic shielding net is avoided, and during the use of the shielded member, when the power of the shielded member is increased, the electromagnetic interference generated by it and the surrounding temperature will also increase accordingly, and as the surrounding temperature increases, the electromagnetic shielding effect of the first electromagnetic shielding net is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic shielding, and in particular to a high-transmittance adaptive electromagnetic shielding device and its application. Background Art

[0002] Electromagnetic shielding is a technology that cuts off the propagation of electromagnetic waves or magnetic fields through shielding materials. In mining machinery and equipment such as shale gas mining equipment, many highly sensitive electronic devices or systems are sensitive to external electromagnetic interference. Excessive electromagnetic interference will reduce the performance of electronic components or systems. Therefore, electromagnetic shielding technology is usually used in conditions where external electromagnetic interference is required. Transparent electromagnetic shielding devices are mainly used to shield areas that need to be observed or transparent, allowing light to pass through while providing shielding.

[0003] Most of the existing transparent electromagnetic shielding devices use glass sandwiched with metal wire mesh or transparent conductive film. Transparent conductive film usually uses electromagnetic shielding materials such as single-layer transparent metal oxide or semiconductor film (such as indium tin oxide). Although its light transmittance is good, its electromagnetic shielding efficiency for high-frequency band is low. Therefore, in some shielding devices with high requirements for high-frequency electromagnetic wave shielding efficiency, transparent electromagnetic shielding devices such as glass sandwiched with metal wire mesh are generally used.

[0004] A mounting structure and method for a metal mesh electromagnetic shielding light window disclosed in Chinese patent CN112020295A, the mounting structure comprising a metal mesh electromagnetic shielding light window, a mirror seat, an upper conductive rubber, a lower conductive rubber and a first pressure ring, the mirror seat being provided with a first step and a second step, the metal mesh electromagnetic shielding light window being provided on the first step and the metal mesh in the metal mesh electromagnetic shielding light window being exposed from the metal mesh electromagnetic shielding light window; the upper conductive rubber and the lower conductive rubber being provided above and below the metal mesh, respectively; the first pressure ring being provided on the upper conductive rubber and being fixedly connected to the mirror seat.

[0005] However, compared with the prior art and the comparative solution, it can be seen that the electromagnetic shielding window film with low reflection and high light transmittance has the following problems in actual use:

[0006] In order to increase the light transmittance of the electromagnetic shielding device, the processing line width of the metal wire mesh is generally reduced. Reducing the processing line width of the metal wire mesh will lead to a decrease in the conductivity of the metal wire mesh, thereby reducing the electromagnetic shielding effect. In order to increase the electromagnetic shielding efficiency, it is necessary to superimpose layers of metal wire mesh. Most existing metal wire meshes are grid metal wire mesh structures or circular metal wire mesh structures. When observing through the electromagnetic shielding device, optical shadow stripes will be generated due to interference, obstructing the line of sight (moiré phenomenon), affecting the observation. Summary of the invention

[0007] The purpose of the present invention is to provide a high-transmittance adaptive electromagnetic shielding device and its application in order to solve the above-mentioned problems.

[0008] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0009] A high-transmittance adaptive electromagnetic shielding device comprises an equipment housing and a mounting mechanism, wherein a first transparent member, a second transparent member and a third transparent member are arranged on the mounting mechanism, both sides of the first transparent member are planes, a side of the second transparent member close to the first transparent member is a plane, a side of the second transparent member away from the first transparent member is a convex spherical surface, a side of the third transparent member close to the second transparent member is a concave spherical surface, and a side of the third transparent member away from the second transparent member is a plane, a first electromagnetic shielding net is arranged between the first transparent member and the second transparent member, and a second electromagnetic shielding net is arranged between the second transparent member and the third transparent member;

[0010] The first electromagnetic shielding net includes a first net frame, on which oblique wires and braided wires are arranged, and the number of the oblique wires and the braided wires are both multiple. The multiple oblique wires are obliquely arranged on the first net frame, and the shape of the braided wire is zigzag, and the adjacent oblique wires are interlaced and woven together up and down. The folding corners of the braided wires are right angles, the oblique wires are in a taut state, and the braided wires are in a non-taut state.

[0011] Preferably: the mounting mechanism comprises a first connecting frame, a second connecting frame is arranged on the first connecting frame, a third connecting frame is arranged on the second connecting frame, the second connecting frame is arranged between the first connecting frame and the third connecting frame, and the first connecting frame and the third connecting frame are both arranged on the device housing.

[0012] Preferably: a first sealing strip and a first sealing ring are provided on the first connecting frame, the first sealing ring is provided between the first connecting frame and the first transparent member, and a connecting bolt is provided on the first connecting frame.

[0013] Preferably: a connecting ring is arranged on the inner side of the second connecting frame, a first connecting groove and a second connecting groove are opened on the second connecting frame, and the first sealing strip is matched with the first connecting groove.

[0014] Preferably: the third connecting frame is provided with a second sealing strip and a second sealing ring, the second sealing strip is matched with the second connecting groove, the second sealing ring is arranged between the third connecting frame and the third transparent member, and the third connecting frame is provided with a connecting pipe.

[0015] Preferably, the second electromagnetic shielding net comprises a second net frame, and the second net frame is provided with horizontal wires and vertical wires.

[0016] Preferably: the first electromagnetic shielding net is arranged on a side of the device housing close to the shielded component, and the second electromagnetic shielding net is arranged on a side of the device housing away from the shielded component.

[0017] Preferably, the first transparent member is arranged on the first connecting frame, the third transparent member is arranged on the third connecting frame, and the second transparent member is arranged on the connecting ring.

[0018] Preferably: a threaded groove matched with the connecting bolt is formed on the inner side of the connecting pipe, and the first connecting frame and the third connecting frame are connected to the device housing through the connecting bolt and the connecting pipe.

[0019] An application of a high-transmittance adaptive electromagnetic shielding device includes being used to eliminate the moiré phenomenon caused by optical interference in areas of electronic products that require electromagnetic shielding and need to be observed or transmitted.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] When observing the shielded component through the shielding device, the moiré phenomenon caused by optical interference between the first electromagnetic shielding net and the second electromagnetic shielding net is avoided. During the use of the shielded component, when the power of the shielded component is increased, the electromagnetic interference it generates and the surrounding temperature will also increase accordingly. As the surrounding temperature increases, the electromagnetic shielding effect of the first electromagnetic shielding net is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0024] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of the present invention;

[0025] Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present invention;

[0026] Figure 4 for Figure 3 A schematic diagram of the structure enlargement at the center A;

[0027] Figure 5 It is a schematic cross-sectional structural diagram of a device housing and a mounting mechanism according to an embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the split structure of the device housing and the mounting mechanism of the embodiment of the present invention;

[0029] Figure 7 for Figure 6A schematic diagram of the structure enlarged at B in the middle;

[0030] Figure 8 for Figure 6 A schematic diagram of the structure enlarged at C in the middle;

[0031] Fig. 9 for Figure 6 A schematic diagram of the structure at D in the middle is enlarged;

[0032] Fig.10 It is a schematic cross-sectional structural diagram of the first transparent member, the second transparent member and the third transparent member of an embodiment of the present invention;

[0033] Fig.11 for Fig.10 A schematic diagram of the path of horizontal light in region E through the first transparent member, the second transparent member and the third transparent member;

[0034] Fig.12 for Fig.10 A schematic diagram of the path of light passing through the first transparent member, the second transparent member and the third transparent member at the first tilt angle in the middle E region;

[0035] Fig.13 for Fig.10 A schematic diagram of the path of light passing through the first transparent member, the second transparent member and the third transparent member at the second tilt angle in the middle E region;

[0036] Fig.14 It is a schematic structural diagram of a first electromagnetic shielding net according to an embodiment of the present invention;

[0037] Fig.15 It is a schematic structural diagram of oblique wires and braided wires in a first state in a first electromagnetic shielding net according to an embodiment of the present invention;

[0038] Fig.16 It is a schematic diagram of the structure of the oblique wires and the braided wires in the first electromagnetic shielding net in the embodiment of the present invention in the second state;

[0039] Fig.17 It is a schematic structural diagram of a second electromagnetic shielding net according to an embodiment of the present invention.

[0040] In the figure: 1. Equipment housing; 2. Installation mechanism; 21. First connecting frame; 211. First sealing strip; 212. First sealing ring; 213. Connecting bolt; 22. Second connecting frame; 221. Connecting ring; 222. First connecting groove; 223. Second connecting groove; 23. Third connecting frame; 231. Second sealing strip; 232. Second sealing ring; 233. Connecting pipe; 3. First transparent part; 4. Second transparent part; 5. Third transparent part; 6. First electromagnetic shielding net; 601. First net frame; 602. Oblique wire; 603. Braided wire; 7. Second electromagnetic shielding net; 701. Second net frame; 702. Horizontal wire; 703. Vertical wire. DETAILED DESCRIPTION

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The present invention will be further described below in conjunction with the accompanying drawings:

[0044] like Figures 1 to 5 As shown, a high-transmittance adaptive electromagnetic shielding device includes a device housing 1 and a mounting mechanism 2, on which a first transparent member 3, a second transparent member 4 and a third transparent member 5 are arranged. Figures 10 to 13 As shown, both sides of the first transparent member 3 are planes, the side of the second transparent member 4 close to the first transparent member 3 is a plane, the side of the second transparent member 4 away from the first transparent member 3 is a convex spherical surface, the side of the third transparent member 5 close to the second transparent member 4 is a concave spherical surface, and the side of the third transparent member 5 away from the second transparent member 4 is a plane. Figures 1 to 5 As shown, a first electromagnetic shielding net 6 is arranged between the first transparent part 3 and the second transparent part 4, a second electromagnetic shielding net 7 is arranged between the second transparent part 4 and the third transparent part 5, the first electromagnetic shielding net 6 is arranged on the side of the device housing 1 close to the shielded part, and the second electromagnetic shielding net 7 is arranged on the side of the device housing 1 away from the shielded part.

[0045] like Figures 4 to 6As shown, the mounting mechanism 2 includes a first connecting frame 21, a second connecting frame 22 and a third connecting frame 23. The second connecting frame 22 is arranged on the first connecting frame 21, the third connecting frame 23 is arranged on the second connecting frame 22, the second connecting frame 22 is arranged between the first connecting frame 21 and the third connecting frame 23, the first connecting frame 21 and the third connecting frame 23 are both arranged on the device housing 1, the first transparent member 3 is arranged on the first connecting frame 21, and the third transparent member 5 is arranged on the third connecting frame 23.

[0046] like Figures 4 to 7 As shown, a first sealing strip 211 and a first sealing ring 212 are provided on the first connecting frame 21 , the first sealing ring 212 is provided between the first connecting frame 21 and the first transparent member 3 , and a connecting bolt 213 is provided on the first connecting frame 21 .

[0047] like Figures 4 to 6 , Figure 8 As shown, a connecting ring 221 is disposed inside the second connecting frame 22 , the second transparent member 4 is disposed on the connecting ring 221 , a first connecting groove 222 and a second connecting groove 223 are formed on the second connecting frame 22 , and the first sealing strip 211 is matched with the first connecting groove 222 .

[0048] like Figures 4 to 6 , Fig. 9 As shown, the third connecting frame 23 is provided with a second sealing strip 231 and a second sealing ring 232, the second sealing strip 231 is adapted to the second connecting groove 223, the second sealing ring 232 is arranged between the third connecting frame 23 and the third transparent member 5, the third connecting frame 23 is provided with a connecting tube 233, the inner side of the connecting tube 233 is provided with a threaded groove adapted to the connecting bolt 213, and the first connecting frame 21 and the third connecting frame 23 are connected to the device housing 1 through the connecting bolt 213 and the connecting tube 233.

[0049] like Figures 14 to 16 As shown, the first electromagnetic shielding net 6 includes a first mesh frame 601, oblique wires 602 and braided wires 603. The first mesh frame 601 is provided with oblique wires 602 and braided wires 603. The number of oblique wires 602 and braided wires 603 is multiple. Multiple oblique wires 602 are obliquely arranged on the first mesh frame 601. The shape of the braided wire 603 is a sawtooth shape. The adjacent oblique wires 602 are interlaced and interspersed up and down to weave together. The folding corners of the braided wire 603 are right angles. The oblique wires 602 are in a taut state, and the braided wires 603 are in a non-taut state. The hypotenuse length a1 of the right-angled triangle grid formed by the oblique wires 602 and the braided wires 603 is equal to half of the minimum microwave wavelength that needs to be shielded, so that the scattering field of the electromagnetic wave after the incidence is mainly backward scattered, thereby ensuring the shielding efficiency.

[0050] like Fig.17As shown, the second electromagnetic shielding net 7 includes a second mesh frame 701, horizontal wires 702 and longitudinal wires 703. The second mesh frame 701 is provided with horizontal wires 702 and longitudinal wires 703. The number of horizontal wires 702 and longitudinal wires 703 is multiple. The multiple longitudinal wires 703 and the multiple horizontal wires 702 are perpendicular to each other and woven with each other. There is a certain pre-tightening force during weaving, so that any two mutually perpendicular longitudinal wires 703 and horizontal wires 702 are in close contact at the intersection to ensure that all longitudinal wires 703 and horizontal wires 702 are conductive. The material of the horizontal wire 702, the longitudinal wire 703, the oblique wire 602 and the braided wire 603 is a metal or alloy with good conductive properties, such as gold, silver, copper, aluminum, Permalloy, etc. According to electromagnetic scattering theory, the side length of the square formed by the longitudinal wires 703 and the transverse wires 702 is less than half of the minimum microwave wavelength that needs to be shielded, so that the electromagnetic wave that partially passes through the first electromagnetic shielding net 6 enters the second electromagnetic shielding net 7 and its scattering field is mainly backward scattered, thereby improving the shielding effect.

[0051] An application of a high-transmittance adaptive electromagnetic shielding device includes the following steps:

[0052] S1. When observing the shielded component through the shielding device, since both sides of the first transparent component 3 are planes, the light passes through the first transparent component 3 normally. Since the side of the second transparent component 4 close to the first transparent component 3 is a plane, and the side of the second transparent component 4 away from the first transparent component 3 is a convex spherical surface, the second transparent component 4 enlarges the second electromagnetic shielding net 7 and gathers the light passing through the second transparent component 4. Since the side of the third transparent component 5 close to the second transparent component 4 is a concave spherical surface, and the side of the third transparent component 5 away from the second transparent component 4 is a plane, the third transparent component 5 shrinks the first electromagnetic shielding net 6 and the second electromagnetic shielding net 7 and diffuses the light passing through the third transparent component 5, avoiding the second transparent component 4 from gathering the passing light and causing a greater impact on the propagation path of the light, thereby ensuring the light transmittance;

[0053] S2. When light of different wavelengths is incident on different positions of the second transparent member 4 and the third transparent member 5 with parallel optical axes, it cannot be focused into a point on the film plane (a plane perpendicular to the line connecting the center of the sphere and the focus of the sphere and passing through the focus), and aberrations (such as Figures 11 to 13 As shown), due to the aberration when the light passes through the convex spherical surface of the second transparent member 4 and the concave spherical surface of the third transparent member 5, the moiré phenomenon caused by optical interference between the first electromagnetic shielding net 6 and the second electromagnetic shielding net 7 is avoided;

[0054] S3. During the use of the shielded component, at normal temperature, the lengths of the two right-angled sides b1 and c1 of the right-angled triangle formed by the braided wire 603 and the oblique wire 602 are the same, and the two right-angled sides b1 and c1 are the braided wire 603, and the hypotenuse a1 of the right-angled triangle formed by the braided wire 603 and the oblique wire 602 is the oblique wire 602;

[0055] S4. When the power of the shielded component increases, the electromagnetic interference and the surrounding temperature will increase accordingly. Since the inclined wire 602 is in a tight state, the position of the inclined wire 602 will not change as the temperature of the shielded component increases.

[0056] S5, the braided wire 603 is not in a tight state. As the temperature of the shielded component increases, the braided wire 603 expands and deforms due to heat (although the thermal expansion coefficient of metal or alloy is low, it will still expand due to temperature changes), so that the angle between the two ends of the braided wire 603 and the oblique wire 602 becomes smaller, and the two right-angled sides b1 and c1 of the right-angled triangle formed by the braided wire 603 and the oblique wire 602 become longer due to the expansion of the braided wire 603;

[0057] S6. Since the hypotenuse a1 of the right triangle formed by the braided wire 603 and the oblique wire 602 is the oblique wire 602, and the oblique wire 602 is in a taut state and its position does not change, the elongated braided wire 603 is displaced on the oblique wire 602, and the angle between the two right-angled sides b1 and c1 of the right triangle formed by the braided wire 603 and the oblique wire 602 becomes smaller, so that the right triangle formed by the braided wire 603 and the oblique wire 602 becomes an acute triangle, and the hypotenuse a1 of the original right triangle becomes shorter due to the displacement of the braided wire 603 on the oblique wire 602, becoming the side a2 of the acute triangle, and the two right-angled sides b1 and c1 of the original right triangle expand and become the sides b2 and c2 of the acute triangle (such as Fig.15 and Fig.16 shown);

[0058] S7. Since the length of the side a2 of the acute triangle is shorter than the length of the hypotenuse a1 of the right triangle, and since the thermal expansion coefficient of the metal or alloy is relatively low, the lengths of the sides b2 and c2 of the acute triangle after expansion will not be longer than the length of the hypotenuse a1 of the right triangle before expansion.

[0059] S8. From the above, it can be seen that the lengths of the sides a2, b2, and c2 of the acute-angled triangle lattice after expansion are all smaller than the length of the hypotenuse a1 of the right-angled triangle lattice before expansion. Since the length of the hypotenuse a1 of the right-angled triangle lattice before expansion is equal to half of the minimum microwave wavelength that needs to be shielded, the lengths of the sides a2, b2, and c2 of the acute-angled triangle lattice after expansion are all smaller than half of the minimum microwave wavelength that needs to be shielded, thereby improving the electromagnetic shielding effect of the first electromagnetic shielding net 6.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A high-transmittance adaptive electromagnetic shielding device, comprising a device housing, characterized in that: It also includes a mounting mechanism, on which a first transparent member, a second transparent member and a third transparent member are arranged, both sides of the first transparent member are planes, a side of the second transparent member close to the first transparent member is a plane, a side of the second transparent member away from the first transparent member is a convex spherical surface, a side of the third transparent member close to the second transparent member is a concave spherical surface, a side of the third transparent member away from the second transparent member is a plane, a first electromagnetic shielding net is arranged between the first transparent member and the second transparent member, and a second electromagnetic shielding net is arranged between the second transparent member and the third transparent member; The first electromagnetic shielding net comprises a first net frame, on which oblique wires and braided wires are arranged, the oblique wires and the braided wires are both in plurality, the plurality of oblique wires are obliquely arranged on the first net frame, the braided wires are in a sawtooth shape, and the adjacent oblique wires are interlaced and braided together, the folding corners of the braided wires are right angles, the oblique wires are in a taut state, and the braided wires are in a non-taut state; The length of the hypotenuse of the right-angle triangle formed by the oblique wires and the braided wires is equal to half of the minimum microwave wavelength that needs to be shielded.

2. The high light transmittance adaptive electromagnetic shielding device according to claim 1, characterized in that: The mounting mechanism includes a first connecting frame, a second connecting frame is arranged on the first connecting frame, a third connecting frame is arranged on the second connecting frame, the second connecting frame is arranged between the first connecting frame and the third connecting frame, and the first connecting frame and the third connecting frame are both arranged on the device housing.

3. The high light transmittance adaptive electromagnetic shielding device according to claim 2, characterized in that: The first connection frame is provided with a first sealing strip and a first sealing ring, the first sealing ring is arranged between the first connection frame and the first transparent member, and the first connection frame is provided with connecting bolts.

4. The high light transmittance adaptive electromagnetic shielding device according to claim 3, characterized in that: A connecting ring is arranged on the inner side of the second connecting frame, a first connecting groove and a second connecting groove are opened on the second connecting frame, and the first sealing strip is matched with the first connecting groove.

5. The high light transmittance adaptive electromagnetic shielding device according to claim 4, characterized in that: The third connection frame is provided with a second sealing strip and a second sealing ring, the second sealing strip is matched with the second connection groove, the second sealing ring is arranged between the third connection frame and the third transparent member, and the third connection frame is provided with a connecting pipe.

6. The high light transmittance adaptive electromagnetic shielding device according to claim 1, characterized in that: The second electromagnetic shielding net includes a second net frame, and the second net frame is provided with horizontal wires and vertical wires.

7. The high light transmittance adaptive electromagnetic shielding device according to claim 1, characterized in that: The first electromagnetic shielding net is arranged on a side of the device housing close to the shielded component, and the second electromagnetic shielding net is arranged on a side of the device housing far from the shielded component.

8. The high light transmittance adaptive electromagnetic shielding device according to claim 4, characterized in that: The first transparent member is arranged on the first connecting frame, the third transparent member is arranged on the third connecting frame, and the second transparent member is arranged on the connecting ring.

9. The high light transmittance adaptive electromagnetic shielding device according to claim 5, characterized in that: A threaded groove matched with the connecting bolt is formed on the inner side of the connecting pipe, and the first connecting frame and the third connecting frame are connected to the device housing through the connecting bolt and the connecting pipe.

10. A high light transmittance adaptive electromagnetic shielding device according to any one of claims 1 to 9, characterized in that: It is used to eliminate the moiré phenomenon caused by optical interference in areas of electronic products that require electromagnetic shielding and need to be observed and transmitted light.

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