CN209842522U - Terminal device based on electromagnetic compatibility design - Google Patents
Terminal device based on electromagnetic compatibility design Download PDFInfo
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- CN209842522U CN209842522U CN201921063376.1U CN201921063376U CN209842522U CN 209842522 U CN209842522 U CN 209842522U CN 201921063376 U CN201921063376 U CN 201921063376U CN 209842522 U CN209842522 U CN 209842522U
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The utility model relates to a terminal device based on electromagnetic compatibility design, including panel and casing, be provided with display screen hole, button hole and screen limit key on the panel, be provided with the interface board in the casing, the front of interface board is provided with liquid crystal display, last keyboard board and the touch-sensitive screen of being provided with of liquid crystal display, keyboard board passes the button hole and links to each other with screen limit key, the touch-sensitive screen passes the display screen hole and fixes on the panel, the back of interface board is provided with external memory, CPU module and first filtering component; the utility model discloses a reduce the interference radiation from the source, reduce the casing shielding measure degree of difficulty, reinforcing machine incasement portion is from compatibility, reduces the outside electromagnetic emission in car leader terminal, and better realization RE102 item requires, effectively reduces electromagnetic radiation, strengthens whole quick-witted electromagnetic shield efficiency, through to electromagnetic radiation's in kind survey and the experiment of touching the end, finally formed above car leader terminal type structure, effectively restrained electromagnetic radiation.
Description
Technical Field
The utility model belongs to the technical field of vehicle mounted terminal, concretely relates to terminal device based on electromagnetic compatibility design.
Background
The conductor terminal is a control command system widely applied to various devices, and is displayed according to the detection result of the electromagnetic compatibility of the conductor terminal, wherein the detection result of the electromagnetic compatibility of the conductor terminal, such as the indexes of CE102 and RE102, does not meet the relevant electromagnetic compatibility requirement; the CE102 (conductive transmission of a 10KHz-10MHz power line) does not meet the requirement, namely the conductive transmission on the input power line (including a return line) of the detected equipment does not meet the electromagnetic transmission and sensitivity requirements specified by the CE102 project in the GJB at the specified frequency; the RE102(10KHz-18GHz electric field radiation emission) does not meet the requirement, namely the electric field emission of the tested equipment and related wires and cables does not meet the electromagnetic emission and sensitivity requirement specified by the CE102 project in the GJB at the specified frequency; resulting in poor stability of the operation of the truck owner terminal, poor accuracy of information transmission and severe impact on the safety of the equipment.
At present, due to the characteristics of more internal electromagnetic emission devices, wider distribution and complex structural opening, most of flat panel terminal products in the vehicle-mounted field are subjected to bay processing, and a functional module and a display screen are divided into two bays, so that the thickness of a terminal is increased and usually exceeds 10cm, and due to the improvement of national military standards, the existing flat panel terminal products with screen edge keys can only pass the test of GJB151A-RE102, and no effective reference scheme can be found for the GJB151B which has more severe requirements.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes the deficiencies in the prior art, the technical problem who solves is: the terminal device can resist electromagnetic radiation, enhance the electromagnetic shielding efficiency of the whole machine and is designed based on electromagnetic compatibility.
In order to solve the technical problem, the utility model discloses a technical scheme be: a terminal device based on electromagnetic compatibility design comprises a panel and a casing, wherein a display screen hole, a key hole and screen edge keys are arranged on the panel, an interface board is arranged in the casing, a liquid crystal display screen is arranged on the front side of the interface board, a keyboard plate and a touch screen are arranged on the liquid crystal display screen, the keyboard plate penetrates through the key hole to be connected with the screen edge keys, the touch screen penetrates through the display screen hole to be fixed on the panel, an external memory, a CPU module and a first filtering assembly are arranged on the back side of the interface board, a second filtering assembly, a brightness adjusting plate and an audio plate are arranged on the side face of the interface board, the interface board is electrically connected with an external interface through the first filtering assembly, and the touch screen is electrically connected with the interface board through the second filtering assembly.
Preferably, a power supply module is further disposed on the back surface of the interface board.
Preferably, the CPU module includes an upper case, a lower case, and a circuit board disposed within the upper case and the lower case.
Preferably, the screen edge key is an integrated rubber key.
Preferably, a conductive rubber strip is arranged between the panel and the casing.
Preferably, a conductive foam is arranged between the display screen and the panel.
Preferably, a conductive rubber pad is arranged between the keyboard plate and the panel.
Compared with the prior art, the utility model following beneficial effect has:
the utility model discloses a reduce the interference radiation from the source, reduce the casing shielding measure degree of difficulty, reinforcing machine incasement portion is from compatible, reduces the outside electromagnetic emission in car leader terminal, and the better realization RE102 item requires effectively to reduce electromagnetic radiation, strengthens whole quick-witted electromagnetic shield efficiency, through to electromagnetic radiation's in kind survey and the experiment of touching the end, has finally formed above car leader terminal type structure, has effectively restrained electromagnetic radiation.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a front view of the present invention;
FIG. 2 is an exploded view of the present invention;
fig. 3 is a schematic structural diagram of the CPU module of the present invention;
fig. 4 is a schematic structural view of the keyboard panel of the present invention;
FIG. 5 is a schematic circuit diagram of the present invention;
FIG. 6 is a test result chart of the present invention;
in the figure: the display device comprises a panel 1, a display screen hole 11, a key hole 12, a screen edge key 13, a casing 2, an interface board 21, a liquid crystal display 22, a keyboard plate 23, a conductive rubber pad 231, a touch screen 24, an external memory 25, a CPU module 26, an upper casing 261, a lower casing 262, a circuit board 263, a first filtering assembly 27, a second filtering assembly 28, a brightness adjusting plate 29, an audio plate 30 and a brightness adjusting key opening 31.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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.
As shown in fig. 1 and fig. 2, a terminal device based on electromagnetic compatibility design includes a panel 1 and a casing 2, the panel 1 is provided with a display hole 11, a key hole 12 and a screen edge key 13, the casing 2 is provided with an interface board 21, a front surface of the interface board 21 is provided with a liquid crystal display 22, the liquid crystal display 22 is provided with a keyboard board 23 and a touch screen 24, the keyboard board 23 passes through the key hole 12 and is connected with the screen edge key 13, the touch screen 24 passes through the display hole 11 and is fixed on the panel 1, a back surface of the interface board 21 is provided with an external memory 25, a CPU module 26 and a first filter assembly 27, a side surface of the interface board 21 is provided with a second filter assembly 28, a brightness adjusting board 29 and an audio board 30, the interface board 21 is electrically connected with an external interface through the first filter assembly 27 to achieve conductive continuity and electromagnetic shielding effect, the external interface comprises an RS232 interface, an RS422 interface, a power supply interface, a network interface and a USB interface; the touch screen 24 is electrically connected with the interface board 21 through a second filtering component 28; the touch screen 24 is connected with the interface board 21 through the second filtering component 28, so that interference conducted to the touch screen 24 through a cable in the casing 2 can be filtered; the multifunctional interface board 21 mainly realizes the conversion from the COM _ E interface of the CPU module 26 to the internal and external interfaces of the terminal, supplies power to the whole machine, and realizes the conversion from +26V input voltage to the secondary power supply of the whole machine; the reinforced liquid crystal display screen 22 controls brightness adjustment and displays multimedia information such as data, graphs, computer images, high-definition digital video images and the like; the keyboard board 23 mainly realizes peripheral key reading, PS2 interface conversion and indicator light driving of various information; the touch screen 24 mainly realizes the input of human-computer interaction position information; the external memory 25 is used for storing basic layer software, public supporting layer software and professional application layer software; the first filtering component 27 filters the electrical signals of the RS232 interface, the RS422 interface, the power interface, the network interface and the USB interface; the second filtering component 28 filters the input signal of the touch screen 24; the brightness adjusting plate 29 can perform key operation; the audio board 30 performs audio digital/analog conversion and signal amplification; the multi-part electrical connection within the housing 2 is shown in figure 5.
Specifically, the key hole 12 is subjected to an electromagnetic compatibility shielding process by means of electrical and structural combination.
Specifically, the keyboard plate 23 adopts a mode that the whole surface of the keyboard plate is coated with copper, the surface of the periphery of the keyboard plate is plated with gold, isolated islands and breakpoints are eliminated in design, and a conductive rubber pad 231 with the thickness of 1mm is combined with the keyboard plate at the gold-plated position, so that a continuous sealed conductor is effectively formed between the keyboard plate 23 and the panel 1, the key hole 12 is isolated outside, and the electromagnetic shielding performance is enhanced; the keyboard board 23 adopts single-chip microcomputer, crystal oscillator and other devices and the shell are positioned on the opposite sides of the keyboard board 23, physical shielding and isolation are realized through the printed board, the keyboard board 23 adopts the PS2 power supply for filtering, and the electromagnetic protection performance is better enhanced.
First filtering component 27 adopts all-metal enclosed construction, adopts all-metal shielding to external interface, carries out filtering to each interface, and first filtering component 27 adopts the integrated unified mode of wave filter and connector, and first filtering component 27 uses 1mm thick electrically conductive gasket to seal with casing 2 junction, reaches the conductivity continuity.
The second filtering component 28 adopts an all-metal closed structure to filter the input and output signals of the touch screen 24.
The brightness adjusting plate 29 adopts a mode that the gold plating is carried out on the peripheral surface, and the gold plating position adopts a conductive rubber pad with the thickness of 1mm to be combined with the panel 1, so that the panel 1 and the brightness adjusting plate 29 form a continuous sealed conductor, and the brightness adjusting key open hole 31 is isolated outside, thereby enhancing the electromagnetic shielding property.
Furthermore, the back of the interface board 21 is further provided with power modules, the power modules are electrically connected with the interface board 21 through the CPU module 26, at least four of the power modules are arranged on the back of the interface board 21, in order to reduce electromagnetic radiation of an interference source, a power module with a medium switching frequency of 250KHz and surface metal package is selected for power conversion, and a filter device X2Y is selected for filtering input and output of the power modules, so as to reduce the antenna effect of internal power line conduction and routing.
Further, as shown in fig. 3, the CPU module 26 includes an upper case 261, a lower case 262, and a circuit board 263, where the circuit board 263 is disposed in a cavity formed by the upper case 261 and the lower case 262; the upper case 261 and the lower case 262 are shielded by using a copper shielding case, so that electromagnetic conduction emission and radiation emission of an interference source are reduced.
Further, the screen edge key 13 is an integrated rubber key for water vapor sealing.
Further, a conductive rubber strip is arranged between the panel 1 and the casing 2; the joint of the panel 1 and the casing 2 is fixed by a fastening screw with the length of 14mm, and the contact surface of the panel 1 and the casing 2 is electromagnetically sealed by a conductive rubber strip with the diameter of 1.78 mm.
Further, be provided with between liquid crystal display 22 and the panel 1 that electrically conductive bubble is cotton to carry out electromagnetic seal, the outside uses the 3M adhesive tape to carry out steam and seals, and liquid crystal display 22 mainly adopts at the whole metal reinforcement of the face in liquid crystal display 22 back, and liquid crystal display 22 openly installs wire mesh shielding glass, and shielding glass links to each other through electrically conductive bubble cotton with casing 2, and touch-sensitive screen 24 passes through the measure of the cable outside parcel electrically conductive sticky tape, realizes electrically conductive continuity and electromagnetic shielding nature between liquid crystal display 22, touch-sensitive screen 24 and casing 2.
Further, as shown in fig. 4, a conductive rubber pad 231 is disposed between the keyboard board 23 and the panel 1; the joint of the keyboard panel 23 and the front panel 1 is sealed with a 1mm thick conductive rubber pad 231.
The internal differential signal wire of the utility model adopts a twisted pair mode, thereby reducing the interference between the lines; the chassis ground is used as an electromagnetic shield body, a main interference leakage channel, and the power ground and the signal ground of each module are separated from the chassis ground of the whole machine, so that the chassis 2 becomes an independent shield body, the electromagnetic compatibility shielding performance is enhanced, and meanwhile, the chassis ground also provides a discharge channel for static electricity.
The main power radiation frequency section of the utility model is concentrated between 2M-100 MHz, the opening size satisfies L <1/50 lambda according to the waveguide principle, and meanwhile, when no larger radiation source is arranged at the opening, the radiation can not pass through; the utility model discloses thickness only is 6cm, reduce the interference radiation from the source of device in the casing, reduce the 2 shielding measure difficulties of casing, reinforcing machine incasement portion is from compatible, reduce the outside electromagnetic emission in car length terminal, better realization RE102 item requires effectively to reduce electromagnetic radiation, strengthen whole quick-witted electromagnetic shield efficiency, through to electromagnetic radiation's in kind survey and touch the end experiment, the terminal type structure of car length above finally having formed, electromagnetic radiation has effectively been suppressed, terminal electromagnetic compatibility is experimental has been accomplished, as shown in fig. 6.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A terminal device designed based on electromagnetic compatibility is characterized in that: the interface board comprises a panel (1) and a shell (2), wherein a display screen hole (11), a key hole (12) and a screen edge key (13) are arranged on the panel (1), an interface board (21) is arranged in the shell (2), a liquid crystal display screen (22) is arranged on the front surface of the interface board (21), a keyboard board (23) and a touch screen (24) are arranged on the liquid crystal display screen (22), the keyboard board (23) penetrates through the key hole (12) to be connected with the screen edge key (13), the touch screen (24) penetrates through the display screen hole (11) to be fixed on the panel (1), an external memory (25), a CPU module (26) and a first filtering component (27) are arranged on the back surface of the interface board (21), a second filtering component (28), a brightness adjusting plate (29) and an audio plate (30) are arranged on the side surface of the interface board (21), and the interface board (21) is electrically connected with an external interface through the first filtering component (27, the touch screen (24) is electrically connected with the interface board (21) through a second filtering component (28).
2. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: the back of the interface board (21) is also provided with a power supply module.
3. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: the CPU module (26) comprises an upper machine shell (261), a lower machine shell (262) and a circuit board (263), wherein the circuit board (263) is arranged in a cavity formed by the upper machine shell (261) and the lower machine shell (262).
4. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: the screen edge key (13) is an integrated rubber key.
5. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: and a conductive rubber strip is arranged between the panel (1) and the shell (2).
6. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: and conductive foam is arranged between the liquid crystal display screen (22) and the panel (1).
7. The terminal device designed based on electromagnetic compatibility according to claim 1, wherein: and a conductive rubber pad (231) is arranged between the keyboard plate (23) and the panel (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063376.1U CN209842522U (en) | 2019-07-09 | 2019-07-09 | Terminal device based on electromagnetic compatibility design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921063376.1U CN209842522U (en) | 2019-07-09 | 2019-07-09 | Terminal device based on electromagnetic compatibility design |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209842522U true CN209842522U (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921063376.1U Expired - Fee Related CN209842522U (en) | 2019-07-09 | 2019-07-09 | Terminal device based on electromagnetic compatibility design |
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| Country | Link |
|---|---|
| CN (1) | CN209842522U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014890A (en) * | 2020-08-28 | 2020-12-01 | 福建平潭旭坤实业有限公司 | Anti-electromagnetic interference device and method for radio wave perspective instrument receiver |
-
2019
- 2019-07-09 CN CN201921063376.1U patent/CN209842522U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112014890A (en) * | 2020-08-28 | 2020-12-01 | 福建平潭旭坤实业有限公司 | Anti-electromagnetic interference device and method for radio wave perspective instrument receiver |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191224 |
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| CF01 | Termination of patent right due to non-payment of annual fee |