CN221199947U - Electronic equipment - Google Patents
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- CN221199947U CN221199947U CN202322977807.8U CN202322977807U CN221199947U CN 221199947 U CN221199947 U CN 221199947U CN 202322977807 U CN202322977807 U CN 202322977807U CN 221199947 U CN221199947 U CN 221199947U
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Abstract
The utility model provides an electronic device comprising a first component, a second component, a third component and an impedance adjusting medium, wherein the second component is fixedly connected to the first component. A third member is fixedly connected to the first member and spaced from the second member. An impedance adjusting medium is disposed between the second and third members to reduce an impedance between the second and third members. According to the embodiment of the utility model, the impedance adjusting medium is arranged between the second component and the third component and is used for reducing the impedance between the second component and the third component, so that the electronic equipment passes the radiation emission test, and the electromagnetic compatibility of the electronic equipment is improved.
Description
Technical Field
The utility model relates to the technical field of electronic equipment and accessories, in particular to electronic equipment.
Background
In electromagnetic compatibility design, establishing a low impedance connection between metallic structural members is an important method of effectiveness. In general, in the structure of electronic devices, metal structural members are connected by bolts, or directly by a common metal structure. Specifically, take the laser radar as an example, including two parts of metal structure spare of lock about, such as base and shell, be provided with functional parts such as circuit board, lens cone in its inside, in conventional design, the base and the shell of lock about pass through bolted connection, but wherein functional parts set up on one of them metal structure spare, for example with base fixed connection, exist the clearance between with the shell.
When electromagnetic waves on functional parts such as a circuit board, a lens barrel and the like are coupled to the housing, since no direct connection is established between the functional parts and the housing, the electromagnetic waves can flow back only through the path of the housing→the base→the functional parts, as shown in fig. 1 a. The electromagnetic compatibility circuit model is shown in fig. 1b, a gap is formed between the shell and the functional component, and the formed parasitic capacitance is extremely small and can be ignored. In fig. 1b, Z 1 represents the ground impedance of the housing and the chassis, Z 2 represents the ground impedance of the functional components such as the circuit board, the lens barrel, etc. and the chassis, Z 3 represents the ability of electromagnetic waves to couple to the housing, and Z 3 is related to the structure of the electronic device, and is difficult to change by an electromagnetic compatibility design.
As can be seen from the circuit model in fig. 1b, the potential difference V 1 between the housing and the functional component can be expressed as:
Wherein V S represents interference electromagnetic waves generated by functional components such as a circuit board, a lens barrel and the like, and is related to the source of the electromagnetic waves and is also difficult to change. The smaller V 1 represents that the fewer electromagnetic waves the electronic device radiates outwards, the better the electromagnetic compatibility. According to the above formula, the conventional structure shown in fig. 1a can optimize the electromagnetic compatibility of the electronic device only by changing the value of (Z 1+Z2), and there is a limit in design and a limit in the optimizing effect that can be achieved, so that it is necessary to provide a new electromagnetic compatibility structural design.
The matters in the background section are only those known to the inventors and do not, of course, represent prior art in the field.
Disclosure of utility model
In view of one or more of the deficiencies in the prior art, the present utility model provides an electronic device comprising:
a first component;
A second component fixedly connected to the first component;
a third member fixedly connected to the first member and spaced from the second member; and
An impedance adjusting medium disposed between the second member and the third member to reduce an impedance between the second member and the third member.
According to one aspect of the utility model, wherein the electronic device further comprises an interference source having electromagnetic radiation of a preset frequency range, the impedance adjusting medium covering an area related to the frequency of the electromagnetic radiation of the interference source.
According to one aspect of the utility model, wherein the first, second and third parts form a first return path for the electromagnetic radiation; the second component, the third component, and the impedance adjusting medium form a second return path for the electromagnetic radiation.
According to one aspect of the utility model, the impedance adjusting medium is a thermally conductive paste.
According to one aspect of the utility model, the second component, the third component and the impedance adjusting medium form a plate capacitor, and the area covered by the impedance adjusting medium is determined according to the dielectric constant of the impedance adjusting medium, the frequency of electromagnetic radiation of an interference source and the distance between the second component and the third component.
According to one aspect of the utility model, wherein the impedance adjusting medium has a dielectric constant greater than that of air.
According to one aspect of the utility model, wherein the impedance adjusting medium comprises conductive foam.
According to one aspect of the present utility model, wherein the thickness of the conductive foam is matched to the distance between the second member and the third member such that the conductive foam is compressed between the second member and the third member, and the amount of compression is defined within a preset range.
According to an aspect of the present utility model, the impedance adjusting medium is provided at a plurality of positions between the second member and the third member.
According to one aspect of the utility model, the electronic device is a laser radar, the first component comprises a base made of metal, the third component comprises an upper cover, and the base is connected with the upper cover through a bolt; the second part comprises a lens barrel, the lens barrel is connected with the base through the bolt, and a gap is reserved between the lens barrel and the upper cover.
Compared with the prior art, the embodiment of the utility model provides the electronic equipment, and the impedance adjusting medium is arranged between the second component and the third component which are arranged at intervals and used for reducing the impedance between the second component and the third component, so that the electronic equipment can pass radiation emission test, and the electromagnetic compatibility of the electronic equipment is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1a is a schematic diagram of an electronic device in the prior art;
FIG. 1b is a circuit model diagram of the assembly relationship shown in FIG. 1 a;
FIG. 1c is a graph of radiation emission test results for the electronic device shown in FIG. 1 a;
FIG. 2 is an assembled schematic view of an electronic device in one embodiment of the utility model;
FIG. 3 is a circuit diagram of the assembled relationship shown in FIG. 2;
FIG. 4 is a graph of radiation emission test results for the electronic device shown in FIG. 2;
Fig. 5 is a schematic diagram of an impedance adjusting medium in one embodiment of the utility model.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless specifically defined otherwise.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, and may be mechanically connected, electrically connected, or may communicate with each other, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the utility model. Furthermore, the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present utility model provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiments of the present utility model will be described below with reference to the accompanying drawings, and it should be understood that the embodiments described herein are for illustration and explanation of the present utility model only, and are not intended to limit the present utility model.
Fig. 2 shows a schematic diagram of the electronic device 1 in one embodiment according to the utility model, fig. 3 is a circuit model diagram of the electronic device 1 shown in fig. 2, and the electronic device 1 is explained below in connection with fig. 2 and 3.
In this embodiment, the electronic device 1 includes a first component 10, a second component 20, and a third component 30, where the second component 20 and the third component 30 are fixedly connected to the first component 10, and a gap is provided between the second component 20 and the third component 30.
Specifically, the first component 10 and the third component 30 may be external wrapping structures or supporting structures of the electronic device 1, where the first component 10 is, for example, a base made of metal, the third component 30 is, for example, an upper cover, the first component 10 and the third component 30 are fixedly connected by bolts, through holes are machined in the first component 10, a threaded hole is provided in a side of the third component 30 facing the first component 10, and a position of the threaded hole corresponds to a position of the through hole, so that the first component 10 and the third component 30 can be fixedly connected by bolts.
The second component 20 may be a functional component arranged between the first component 10 and the third component 30, in particular, the second component 20 may have different forms according to the practical application of the electronic device 1, for example, the electronic device 1 is a laser radar, wherein the second component 20 may be a lens barrel for modulating a light beam in the laser radar, and the first component 10 is, for example, a metal base, and the lens barrel may be fixedly connected with the metal base through a bolt. In various embodiments of the present utility model, the second component 20 may be other circuit-related components, which are not limited in any way.
As shown in fig. 2, in the present embodiment, the electronic apparatus 1 further includes an impedance adjusting medium 40, the impedance adjusting medium 40 being disposed between the second member 20 and the third member 30 for reducing the impedance between the second member 20 and the third member 30. According to the foregoing, the second member 20 and the third member 30 in the present embodiment have a gap therebetween, that is, the second member 20 and the third member 30 are open-circuited by air, no direct electrical connection is formed, and by providing the impedance adjusting medium 40, the impedance between the second member 20 and the third member 30 is reduced to allow communication between the second member 20 and the third member 30, and particularly as shown in fig. 2, the impedance adjusting medium 40 can form a second return flow path between the second member 20 and the third member 30.
The electromagnetic radiation of the electronic device 1 in this embodiment can be grounded through the loop formed between the second component 20, the third component 30 and the impedance adjusting medium 40, so as to reduce the external radiation amount, so that the electronic device 1 can pass the radiation emission test, and meet the electromagnetic compatibility requirement. The following is a comparison of the electronic device 1 in this embodiment with a conventional electronic device assembly as shown in fig. 1 a-1 c.
An electronic device assembly condition in the prior art shown in fig. 1a, a circuit model of which is shown in fig. 1b, according to the description in the background art, the condition shown in fig. 1a has a return path of a case→a base→a functional component, and a potential difference V 1 between the case and the functional component can be expressed as:
Where V S represents an interfering electromagnetic wave generated by the functional component, Z 1 represents the ground impedance of the housing and the chassis, Z 2 represents the ground impedance of the functional component such as the circuit board, the lens barrel, and the like, and Z 3 represents the ability of the electromagnetic wave to couple to the housing. In the above formula, the smaller V 1 represents that the electromagnetic wave radiated outwards from the electronic device is less, and the better the electromagnetic compatibility is. In case Z 3 and V S are difficult to change, the structure shown in fig. 1a can only optimize the electromagnetic compatibility of the electronic device by changing the value of Z 1+Z2, and the adjustment capability for electromagnetic radiation is limited. In a specific application, the electronic device shown in fig. 1a is subjected to radiation emission test, and the test result is shown in fig. 1c, and at the electromagnetic wave frequency of 1.2GHz, the electromagnetic wave radiated outwards exceeds a threshold value by 13dB, so that the electromagnetic compatibility requirement is not satisfied.
As shown in fig. 2, two return paths are formed in the present embodiment, which are, respectively, the first return path formed by the third member 30, the first member 10, the second member 20, and the second return path formed by the third member 30, the second member 20, and the impedance adjusting medium 40. The electromagnetic waves can be grounded through the first and second return paths, thereby reducing the transmission of the electromagnetic waves through the path of the outward radiation shown in fig. 2, resulting in electromagnetic interference.
The second member 20, the third member 30, and the impedance adjusting medium 40 sandwiched therebetween can be regarded as a capacitance, and a circuit model of the electronic apparatus 1 shown in fig. 2 is shown in fig. 3. The impedance of the capacitor is inversely proportional to the capacitance value C thereof, and in particular, the impedance Z C of the capacitor formed by the second component 20, the third component 30 and the impedance adjusting medium 40 can be expressed as follows:
Where f represents the frequency of the electromagnetic wave generated by the interference source V S. According to the market, the larger the capacitance value C formed by the second member 20, the third member 30 and the impedance adjusting medium 40, the smaller the impedance Z C thereof.
Further, in the case where the first reflow path and the second reflow path exist at the same time, the potential difference V 2 between the third member 30 and the second member 20 can be expressed as follows:
Where Z 1 represents the ground impedance of the third component 30 and the first assembly 10, Z 2 represents the ground impedance of the second component 20 and the first component 10, and Z 3 represents the ability of electromagnetic waves to couple to the third component 30. According to the above equation, the larger the capacitance value C, the smaller the potential difference V 2 between the third member 30 and the second member 20, the smaller the amount of electromagnetic radiation to the outside, and the better the electromagnetic compatibility.
Meanwhile, according to the above formula, V 2 is also related to the electromagnetic wave frequency of the interference source V S, and in practical application, the electromagnetic wave frequency of the interference source V S is related to the specific interference source V S, which is not affected by the electromagnetic compatibility design. Thus, in accordance with a preferred embodiment of the present utility model, in performing an electromagnetic compatibility design, the capacitance value C may be set according to the electromagnetic wave frequency (or frequency range) of the interference source V S to reduce the potential difference V 2 between the third component 30 and the second component 20, reducing the amount of external radiation.
According to an embodiment of the present utility model, in the case of being substantially the same as the other conditions (the values of Z 1、Z2、Z3 and f) in fig. 1a, by adjusting the magnitude of the capacitance value C, the radiation amount of the electronic device 1 radiated outwards can be effectively reduced. For example, it is preferable that the radiation emission test result of the electronic device 1 shown in fig. 2 is that, as shown in fig. 4, the radiation amount radiated to the outside is reduced by about 16dB below the threshold value of the radiation emission test compared to the radiation amount of the electronic device shown in fig. 1a at a frequency of 1.2GHz, and the electronic device 1 in the present embodiment is capable of passing the radiation emission test.
Further, the interference source V S in the electronic device 1 has electromagnetic radiation in a preset frequency range, such as various circuit devices capable of radiating electromagnetic waves, and the area covered by the impedance adjusting medium 40 is related to the frequency of the electromagnetic radiation of the interference source V S.
According to a preferred embodiment of the present utility model, wherein the second member 20, the third member 30 and the impedance adjusting medium 40 therein are formed in a structure similar to a plate capacitor, the formula is calculated from the capacitance value of the plate capacitor:
C＝εrε0S/d，
Where ε 0 is the vacuum dielectric constant, the value 8.854 ×10 -12,εr is the relative dielectric constant, S is the area covered by the impedance adjusting medium 40, and d is the distance between the second member 20 and the third member 30. As can be seen from the above calculation formula, the capacitance value C of the plate capacitor is positively correlated with the area S covered by the impedance adjusting medium 40, and the area S covered by the impedance adjusting medium 40 can be calculated after selecting an appropriate capacitance value C according to the frequency f of the electromagnetic radiation of the interference source V S.
Specifically, as can be seen from the above equation, the area S covered by the impedance adjusting medium 40 is determined according to the dielectric constant ε r of the impedance adjusting medium 40, the frequency f of electromagnetic radiation of the disturbance source V S, and the distance d between the second member 20 and the third member 30. The frequency f of the electromagnetic radiation of the interference source V S is determined by the interference source V S of the electronic device 1, the distance d between the second component 20 and the third component 30 is determined by the structural design of the electronic device 1, and the distance d can be regarded as a fixed value when the electromagnetic compatibility design is performed. The dielectric constant epsilon r of the impedance adjusting medium 40 is determined by the material property of the impedance adjusting medium 40, and after a proper capacitance value C is selected according to the frequency f, fixed values epsilon 0、εr and d are substituted into the capacitance value calculation of the plate capacitance to obtain the covered area S of the impedance adjusting medium 40.
Similarly, according to the calculation formula of the capacitance value C of the plate capacitor, a suitable material of the impedance adjusting medium 40 (i.e. changing the relative dielectric constant epsilon r) can be selected, and the area S covered by the impedance adjusting medium 40 can be combined to obtain a suitable capacitance value C.
In fact, as shown in fig. 1a, the functional component and the housing are arranged at intervals, air exists between the functional component and the housing, and the functional component, the housing and the air filled in the middle can be regarded as a plate capacitor, but the relative dielectric constant of the air is 1, the value is smaller, the capacitance value is smaller, the impedance is larger, and therefore the plate capacitor is regarded as an open circuit when the electromagnetic compatibility design is carried out. Accordingly, in selecting the material of the impedance adjusting medium 40 in the embodiment of the present utility model, a material having a dielectric constant greater than that of air is selected.
According to a preferred embodiment of the present utility model, the impedance adjusting medium 40 comprises a heat conductive paste, i.e. the heat conductive paste is applied between the second part 20 and the third part 30, and the heat conductive paste generally comprises a silicone, the dielectric constant of which is greater than that of air, and the dielectric constant of the whole heat conductive paste is also greater than that of air, so that the heat conductive paste can be used as the impedance adjusting medium 40. Specifically, for example, TF350-L heat conducting adhesive manufactured by AoChuan manufacturer is selected, and the relative dielectric constant epsilon r is 7 and is larger than that of air. On the other hand, the heat conductive adhesive has good heat conductive and radiating properties, and the heat conductive adhesive of the model has a heat conductivity coefficient of 3.5W/m.K, and can be used for promoting the heat of the second component 20 to be transferred outwards through the third component 30. And moreover, the heat conducting glue can be automatically added, so that the processing efficiency of the electronic equipment 1 is improved, and the processing cost is reduced.
According to another embodiment of the present utility model, the impedance adjusting medium 40 includes conductive foam, which is an elastic material capable of performing a conductive function, and has a dielectric constant greater than that of air. Meanwhile, the conductive foam can generate elastic deformation after being pressed, and can absorb a certain amount of deformation. In practical applications, because the distances between the second component 20 and the third component 30 in the electronic device 1 are not equal everywhere and completely conform to the design values due to structural design and machining tolerances, the conductive foam can be compressed between the second component 20 and the third component 30 by utilizing the characteristic that the conductive foam can absorb deformation, so that the conductive foam is kept connected with the second component 20 and the third component 30. Further, conductive foam may be adhered between the second member 20 and the third member 30.
Specifically, in the preferred embodiment of the present utility model, the thickness of the conductive foam is matched to the distance between the second and third members 20 and 30 such that the conductive foam is compressed between the second and third members 20 and 30, and preferably the thickness of the conductive foam is slightly greater than the distance between the second and third members 20 and 30 such that the conductive foam is slightly compressed. Since the compression amount of the conductive foam has a limit, excessive compression of the conductive foam may cause excessive stress between the second part 20 and the third part 30, which is detrimental to structural stability of the electronic device 1, the compression amount of the conductive foam in the present embodiment is limited within a predetermined range, for example, the compression amount of the conductive foam is not more than 50%. In the case that the interval between the second member 20 and the third member 30 is too small, for example, less than 0.1mm, it is not preferable to provide the conductive foam, and it is preferable to use the conductive foam in cooperation with the conductive paste in the previous embodiment.
Fig. 5 shows a specific structure of the impedance adjusting medium 40 in the preferred embodiment according to the present utility model, in which the impedance adjusting medium 40 is provided at a plurality of positions between the second member 20 and the third member 30, that is, in the present embodiment, the impedance adjusting medium 40 may be discontinuous, a circuit model thereof may be a plurality of capacitances connected in parallel, and in particular, the position at which the impedance adjusting medium 40 is provided may be matched with the spacing between the second member 20 and the third member 30. Further, the impedance adjusting medium 40 includes a heat-conducting glue, and the heat-conducting glue may be added between the second component 20 and the third component 30, and the setting position of the heat-conducting glue may also be matched with the heating position in the second component 20, so as to further improve the heat dissipation effect.
Finally, it should be noted that: the foregoing description is only illustrative of the present utility model and is not intended to be limiting, and although the present utility model has been described in detail with reference to the foregoing illustrative embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. An electronic device, comprising:
a first component;
A second component fixedly connected to the first component;
a third member fixedly connected to the first member and spaced from the second member; and
An impedance adjusting medium disposed between the second member and the third member to reduce an impedance between the second member and the third member.
2. The electronic device of claim 1, wherein the electronic device further comprises an interference source having electromagnetic radiation of a preset frequency range, the impedance adjusting medium covering an area related to the frequency of the electromagnetic radiation of the interference source.
3. The electronic device of claim 2, wherein the first component, the second component, and the third component form a first return path for the electromagnetic radiation; the second component, the third component, and the impedance adjusting medium form a second return path for the electromagnetic radiation.
4. The electronic device of claim 2, wherein the impedance adjusting medium is a thermally conductive paste.
5. The electronic device of claim 4, wherein the second component, the third component, and the impedance adjusting medium form a plate capacitance, and wherein the area covered by the impedance adjusting medium is determined based on a dielectric constant of the impedance adjusting medium, a frequency of electromagnetic radiation of an interference source, and a spacing of the second component and the third component.
6. The electronic device of claim 4, wherein the impedance adjusting medium has a dielectric constant greater than a dielectric constant of air.
7. The electronic device of claim 2, wherein the impedance adjusting medium comprises conductive foam.
8. The electronic device of claim 7, wherein a thickness of the conductive foam matches a distance between the second component and the third component such that the conductive foam is compressed between the second component and the third component, and an amount of compression is defined within a preset range.
9. The electronic device according to any one of claims 1-8, characterized in that the impedance adjusting medium is provided at a plurality of locations between the second part and the third part.
10. The electronic device of any one of claims 1-8, wherein the electronic device is a lidar, the first component comprises a base made of metal, the third component comprises an upper cover, and the base is connected to the upper cover by a bolt; the second part comprises a lens barrel, the lens barrel is connected with the base through the bolt, and a gap is reserved between the lens barrel and the upper cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322977807.8U CN221199947U (en) | 2023-11-02 | 2023-11-02 | Electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322977807.8U CN221199947U (en) | 2023-11-02 | 2023-11-02 | Electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221199947U true CN221199947U (en) | 2024-06-21 |
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| CN202322977807.8U Active CN221199947U (en) | 2023-11-02 | 2023-11-02 | Electronic equipment |
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| CN (1) | CN221199947U (en) |
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2023
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