Low-leakage handheld intelligent terminal

Abstract

The invention discloses a low-leakage handheld intelligent terminal, and relates to the technical field of intelligent terminals, the low-leakage handheld intelligent terminal comprises an outer shell, a liquid crystal display screen mounting structure, a main control board shielding structure and a power supply element, the main control board shielding structure, the liquid crystal display screen mounting structure and the power supply element are all mounted in the outer shell, and the power supply element is used for providing a power supply; and shielding modules for providing electromagnetic shielding are arranged in the main control board shielding structure and the liquid crystal display screen mounting structure. The shielding effect can be improved, information leakage is effectively prevented, and the security of confidential information is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent terminals, and in particular to a low-radiation handheld intelligent terminal. Background Art

[0002] With the acceleration of informatization, information processing devices are increasingly used. These devices generate not only electromagnetic radiation but also electromagnetic information leakage during operation, leading to the theft and restoration of confidential information and resulting in leaks. Ordinary handheld devices lack high electromagnetic protection levels, and their operation is often accompanied by significant electromagnetic wave leakage. The radiation frequencies range from low to high, and the sources include magnetic, electric, and electromagnetic waves. Research has shown that the electromagnetic waves emitted by ordinary handheld terminals without electromagnetic shielding can be intercepted and restored at distances up to one kilometer. Using highly sensitive equipment, the maximum interception distance is even greater. In this scenario, if the information processed by the device is critical, the security of the information cannot be guaranteed, making the device's information highly susceptible to leakage.

[0003] Therefore, without safe and reliable means of protecting against electromagnetic leakage emissions, even the most advanced information processing equipment is not suitable for use in confidential and secret systems. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-radiation handheld intelligent terminal to solve the problems existing in the above-mentioned prior art, improve the shielding effect, effectively prevent information leakage, and ensure the security of confidential information.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a low-radiation handheld intelligent terminal, comprising an outer shell, a liquid crystal display mounting structure, a main control board shielding structure and a power supply element. The main control board shielding structure, the liquid crystal display mounting structure and the power supply element are all mounted in the outer shell. The power supply element is used to provide power. The main control board shielding structure and the liquid crystal display mounting structure are both provided with a shielding module for providing electromagnetic shielding.

[0007] Preferably, the outer shell includes a front cover, a middle frame and a back cover that can be detachably connected from top to bottom. An upper cavity is formed between the front cover and the middle frame, and the upper cavity is used to install the LCD mounting structure. A lower cavity is formed between the middle frame and the back cover, and the lower cavity is used to install the main control board shielding structure and the power supply element.

[0008] Preferably, the LCD screen mounting structure includes a display screen assembly and a human body sensing switch, the human body sensing switch is installed on the middle frame, and the human body sensing switch is electrically connected to the display screen assembly, and the human body sensing switch can control the display screen assembly to be turned off according to whether a human body is sensed, and the upper end surface of the middle frame is provided with a groove body for installing the display screen assembly, and the display screen assembly includes a capacitive touch screen, a liquid crystal display and a random mesh shielding film arranged in sequence from top to bottom, the random mesh shielding film is installed between the capacitive touch screen and the liquid crystal display, and the capacitive touch screen, the liquid crystal display and the random mesh shielding film are optically bound, and a shielding element is provided at the contact position of the random mesh shielding film and the middle frame.

[0009] Preferably, the upper end surface of the middle frame is provided with a circle of embedding grooves, the embedding grooves are arranged close to the outer circle of the middle frame, and the shielding element is installed in the embedding grooves; the outer edge of the capacitive touch screen extends out of the liquid crystal display screen, and the random mesh shielding film covers the lower end surface of the capacitive touch screen, and when the middle frame is connected to the front cover, the capacitive touch screen can press the random mesh shielding film and the shielding element above the embedding grooves, and the shielding element is located at the lower end of the random mesh shielding film; the display screen assembly also includes a touch control board, a filter circuit is provided on the touch control board, a shielding chamber body is provided between the lower end of the liquid crystal display screen and the upper end surface of the middle frame, the touch control board is installed in the shielding chamber body, and the touch control board is electrically connected to the liquid crystal display screen through a flexible flat cable.

[0010] Preferably, the upper end surface of the middle frame is further provided with a sensing groove, the human body sensing switch is installed in the sensing groove, and the middle frame is provided with a wire outlet hole, the wire outlet hole is used for the connection cable of the human body sensing switch to pass through, and the connection cable is wrapped with a conductive cloth on the outer periphery of the position corresponding to the wire outlet hole, and the conductive cloth is filled between the inner wall of the wire outlet hole and the outer wall of the connection cable; the sensing angle of the human body sensing switch is 45° to 45°, and the sensing distance of the human body sensing switch is within 0.3m.

[0011] Preferably, the main control board shielding structure includes a main control board and functional devices, the inner side of the middle frame is provided with a mounting groove for installing the main control board, the back cover is buckled on one side of the middle frame, and an installation chamber is formed between the back cover and the middle frame, the main control board is located in the installation chamber, the functional devices are installed on the main control board, the shielding module on the main control board shielding structure includes a main control shielding cover and a shielding element, the main control shielding cover is installed on the side of the main control board close to the back cover, and a shielding chamber is formed between the main control shielding cover and the main control board, the functional devices are installed in the shielding chamber, and the shielding element is installed on the periphery of the main control board and the functional devices.

[0012] Preferably, the functional devices include a rear camera, a rear macro camera, an infrared thermal imaging camera and a flash, all of which are installed on the main control board on the side close to the back cover, one end of the rear camera, the rear macro camera, the infrared thermal imaging camera and the flash all extend out of the main control shielding cover, and the rear camera, the rear macro camera, the infrared thermal imaging camera and the flash are all provided with the shielding element; a light outlet is provided on the back cover at a position corresponding to the flash, and a light shield, a fixing bracket and a soft light shield are provided at the flash, the light shield is installed on the outer periphery of the flash on the side close to the back cover, the fixing bracket is installed at the light outlet, and the middle part of the fixing bracket is opened and used for light transmission, the soft light shield is installed on the fixing bracket, and the fixing bracket is located between the light shield and the soft light shield.

[0013] Preferably, the shielding element includes a copper-plated layer, a shielding window, a metal conductive mesh and a conductive foam layer, the copper-plated layer is coated on the outer ring of the main control board, and one end of the copper-plated layer extends to the upper end surface of the main control board and is in close contact with the middle frame, and the other end of the copper-plated layer extends to the lower end surface of the main control board and is in close contact with the main control shielding cover; a rear window is provided on the back cover corresponding to the positions of the rear camera and the rear macro camera, the shielding window is installed on the inner side of the back cover, and the shielding window can cover the two rear windows, and the outer edge of the shielding window is adhered to the inner side of the back cover. The metal conductive mesh is installed on the side of the fixing frame away from the light shield, and one side of the metal conductive mesh contacts the soft light cover; the conductive foam layer is arranged around the periphery of the image acquisition end of the infrared thermal imaging camera, and one end of the conductive foam layer is in close contact with the base of the infrared thermal imaging camera, the other end of the conductive foam layer is in close contact with the inner wall of the back cover, and the periphery of the conductive foam layer is in close contact with the main control shielding cover; a germanium glass layer is installed on the back cover at a position corresponding to the infrared thermal imaging camera, and the periphery of the germanium glass layer is bonded to the back cover by conductive glue.

[0014] Preferably, the power supply element includes a battery and a power supply board, the battery is electrically connected to the power supply board, and a power supply shielding cover is also connected to the lower end of the middle frame, and a power supply shielding cavity is formed between the power supply shielding cover and the middle frame. The power supply board is installed at the lower end of the middle frame and is located in the power supply shielding cavity. An extrusion spring is also provided at the contact position between the power supply shielding cover and the middle frame, and the power supply shielding cover and the middle frame can compress the extrusion spring; the battery is installed on the back cover, and a heat-conductive film is installed between the battery and the back cover.

[0015] Preferably, the power supply shielding cover is provided with a plurality of ventilation holes, the aperture of the ventilation holes is 2 mm, and the distance between adjacent ventilation holes is 4 mm.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention provides a low-emission handheld intelligent terminal, comprising an outer shell, an LCD display mounting structure, a main control board shielding structure, and a power supply element. The main control board shielding structure, LCD display mounting structure, and power supply element are all mounted within the outer shell. The power supply element is used to provide power. Both the main control board shielding structure and the LCD display mounting structure are equipped with shielding modules for providing electromagnetic shielding. The shielding module in the main control board shielding structure can achieve electromagnetic shielding for the main control board and its connected functional components. The shielding module in the LCD display mounting structure can protect the privacy and sensitive information of users within the device, reduce potential leaks, improve user safety, and prevent electromagnetic information leakage from the LCD display during use. Through the aforementioned shielding design, the present invention ensures that electromagnetic radiation and conducted emission indicators meet the electromagnetic shielding requirements of GJB4216-2001, "Requirements and Measurements for Electromagnetic Leakage Emissions of Cryptographic Machines," effectively preventing information leakage and ensuring the security of confidential information. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0019] Figure 1 This is a front view of the low-radiation handheld intelligent terminal of the present invention;

[0020] Figure 2 A side view of the low-radiation handheld intelligent terminal of the present invention;

[0021] Figure 3 This is a rear view of the low-radiation handheld smart terminal of the present invention;

[0022] Figure 4 This is a structural exploded view of the low-radiation handheld intelligent terminal of the present invention;

[0023] Figure 5 A schematic diagram of the arrangement position of the display screen assembly in the present invention;

[0024] Figure 6 This is a schematic diagram of the location of the human body sensing switch in the present invention;

[0025] Figure 7 Schematic diagram of the sensing range of the human body sensing switch in the present invention;

[0026] Figure 8 A schematic diagram of the arrangement position of the power supply element in the present invention;

[0027] Figure 9 A schematic diagram of the installation position of the shielding cover in the present invention;

[0028] Figure 10 Schematic diagram of the arrangement position of the cable pressing plate in the present invention;

[0029] Figure 11 Schematic diagram of the structure of the shielding element at the functional device of the present invention;

[0030] In the figure: 1-front cover, 2-capacitive touch screen, 3-random mesh shielding film, 4-LCD screen, 5-function buttons, 6-button pressure plate, 7-microphone, 8-middle frame, 9-power supply board, 10-power supply shielding cover, 11-speaker, 12-infrared thermal imaging camera, 13-touch control board, 14-battery, 15-germanium glass layer, 16-conductive foam layer, 17-back cover, 18-soft cover, 19-shielding window, 20-fixing frame, 21-metal conductive mesh film, 22-cable pressure plate, 23-light shielding cover, 24-main control shielding cover, 25-flexible cable, 26-main control board, 27-connecting cable, 28-front camera, 29-conductive rubber plate, 30-dustproof film, 31-human body sensing switch, 32-conductive rubber strip, 33-reed, 34-flash, 35-rear camera, 36-rear macro camera, 37-copper plating layer. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a low-radiation handheld intelligent terminal to solve the problems existing in the prior art, improve the shielding effect, effectively prevent information leakage, and ensure the security of confidential information.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1-11 As shown, this embodiment provides a low-leakage handheld intelligent terminal, comprising an outer shell, an LCD display mounting structure, a main control board shielding structure, and a power supply element. The main control board shielding structure, LCD display mounting structure, and power supply element are all mounted within the outer shell. The power supply element is used to provide power. Both the main control board shielding structure and the LCD display mounting structure are provided with a shielding module for providing electromagnetic shielding. The shielding module in the main control board shielding structure can achieve electromagnetic shielding for the main control board 26 and its connected functional components. The shielding module in the LCD display mounting structure can protect the privacy and sensitive information of users within the device, reduce potential leaks, improve user safety, and prevent electromagnetic information leakage from the LCD display 4 during use. Through the above-mentioned shielding design, the present invention ensures that the electromagnetic radiation and conducted emission indicators meet the electromagnetic shielding requirements of GJB4216-2001 "Electromagnetic Leakage Emission Requirements and Measurements for Cryptographic Machines," effectively preventing information leakage and ensuring the security of confidential information.

[0035] Specifically, the outer shell includes a front cover 1, a middle frame 8 and a back cover 17 that can be detachably connected from top to bottom. An upper cavity is formed between the front cover 1 and the middle frame 8, and the upper cavity is used to install the LCD mounting structure. A lower cavity is formed between the middle frame 8 and the back cover 17, and the lower cavity is used to install the main control board shielding structure and power supply components.

[0036] The LCD screen installation structure includes a display screen assembly and a human body sensing switch 31. The human body sensing switch 31 is installed on the middle frame 8, and the human body sensing switch 31 is electrically connected to the display screen assembly. Combining the human body sensing switch 31 with the display screen assembly significantly improves the intelligence level of the device. The human body sensing switch 31 can control the display screen assembly to turn off according to whether a human body is sensed. When the staff enters the sensing range of the human body sensing switch 31, the human body sensing switch 31 detects changes in the infrared spectrum of the human body. At this time, the power button is pressed and the device enters the working state. As long as the staff does not leave the sensing range of the human body sensing switch 31, the device will remain in the working state. When the staff leaves the sensing range of the human body sensing switch 31, the human body sensing switch 31 cannot detect human body information and the device automatically turns off to prevent others from peeping, timely protect the privacy and sensitive information of users in the device, reduce the risk of leakage, improve the safety of use, and at the same time, reduce unnecessary energy consumption and achieve energy saving and consumption reduction. , providing convenience for users, and it is simple and convenient to use, improving user experience and energy efficiency. The upper end surface of the middle frame 8 is milled with a groove for installing the display screen assembly to ensure that the display screen assembly can be stably installed in the middle frame 8. The display screen assembly includes a capacitive touch screen 2, a liquid crystal display 4 and a random mesh shielding film 3 arranged from top to bottom. The random mesh shielding film 3 is installed between the capacitive touch screen 2 and the liquid crystal display 4, and the random mesh shielding film 3 has high shielding effectiveness in the full band and has no moiré fringes. The capacitive touch screen 2, the liquid crystal display 4 and the random mesh shielding film 3 are optically bound. After binding, not only can the shielding requirements be better met, but the shock absorption and optical performance of the liquid crystal display 4 can also be effectively improved. A shielding element is provided at the contact position of the random mesh shielding film 3 and the middle frame 8, which effectively prevents the electromagnetic information leakage of the liquid crystal display 4 during use through electromagnetic protection. Through the above-mentioned shielding treatment measures, it has excellent shielding effectiveness in the full band.

[0037] The upper end surface of the middle frame 8 is provided with a circle of embedded grooves, which are arranged near the outer circle of the middle frame 8, and the shielding element is installed in the embedded grooves. The outer edge of the capacitive touch screen 2 extends beyond the liquid crystal display 4, and the random mesh shielding film 3 covers the lower end surface of the capacitive touch screen 2. The middle frame 8 is connected to the front cover 1, and when the liquid crystal display 4 is installed in the groove, it can ensure that the capacitive touch screen 2 presses the random mesh shielding film 3 and the shielding element above the embedded groove, and the shielding element is located at the lower end of the random mesh shielding film 3, and the random mesh shielding film 3 and the shielding element are in close contact. As a preferred embodiment, the shielding element is a conductive rubber sheet 29, more preferably an aluminum-silver-plated conductive rubber sheet. By squeezing and deforming the conductive rubber sheet 29, electrical continuity is maintained, effectively preventing the leakage of electromagnetic waves at the gap, and achieving a better shielding effect.

[0038] As a preferred solution, the capacitive touch screen 2 in this embodiment is a screen technology that uses the current induction of the human body to detect electric shock. It is mainly composed of a glass substrate, an ITO conductive layer and a protective layer. It supports multi-touch and is scratch-resistant and oil-resistant.

[0039] The display assembly also includes a touch control board 13. A shielding chamber is provided between the lower end of the liquid crystal display screen 4 and the upper end surface of the middle frame 8. The touch control board 13 is installed in the shielding chamber to achieve signal shielding. The touch control board 13 is electrically connected to the liquid crystal display screen 4 via a flexible flat cable 25. The touch control board 13 is also interconnected with other devices via a flexible flat cable 25 to avoid external radiation. A filtering circuit is provided on the touch control board, so that the touch control board 13 provides charge to the electrodes of the capacitive touch screen 2 while also filtering the signal fed back by the capacitive touch screen 2.

[0040] An induction groove is also provided on the upper end face of the middle frame 8, and a human body induction switch 31 is installed in the induction groove, and a wire outlet hole is provided on the middle frame 8. The wire outlet hole is semicircular and is used for the connection cable 27 of the human body induction switch 31 to pass through. Since holes are one of the main reasons for leakage of the shielding body, the connection cable 27 is wrapped with a conductive cloth at the outer periphery of the position corresponding to the wire outlet hole. The conductive cloth is preferably made of aluminum. The conductive cloth is filled between the inner wall of the wire outlet hole and the outer wall of the connection cable 27, and the wrapped connection cable 27 can cooperate with the conductive cloth to completely fill the wire outlet hole. Then, when the back cover 17 is locked with screws, the connection cable 27 at the wire outlet hole is also tightened to ensure that the electromagnetic waves inside the device will not leak at the wire outlet hole, thereby meeting the shielding effectiveness requirements.

[0041] The human sensor switch 31 features low power consumption and is housed in a separate cavity from the other internal components within the middle frame 8. Its sensing angle ranges from 45° in pitch to 45° in elevation, and its sensing distance is within 0.3m, enabling coverage over a wide area. As a preferred solution, the human sensor switch 31 is designed to automatically shut down after 10 seconds of no human presence detection.

[0042] The outer ring of the upper end surface of the middle frame 8 is provided with a circle of bosses, and the inner sidewalls of the bosses are used to limit the periphery of the capacitive touch screen 2, thereby improving the installation stability of the capacitive touch screen 2 and preventing the capacitive touch screen 2 from shaking.

[0043] The inner side of the middle frame 8 is provided with an installation groove for installing the main control board 26. The back cover 17 is snapped onto one side of the middle frame 8, and an installation chamber is formed between the back cover 17 and the middle frame 8 to provide installation space for the main control board 26 and functional devices. The main control board 26 is located in the installation chamber, and the functional devices are installed on the main control board 26. The shielding assembly includes a main control shielding cover 24 and a shielding element. The main control shielding cover 24 is installed on the side of the main control board 26 close to the back cover 17, and a shielding chamber is formed between the main control shielding cover 24 and the main control board 26. The functional devices are installed in the shielding chamber, thereby providing electromagnetic shielding for the main control board 26 and the functional devices connected thereto. The shielding element is installed on the periphery of the main control board 26 and the functional devices to improve the shielding effect.

[0044] As a preferred solution, the main control shield 24 is made of a metal material, preferably a low-resistance metal material, to effectively resist interference from the high-frequency electromagnetic field generated by the main control board 26. The main control shield 24, made of metal, absorbs and reflects the electromagnetic field, achieving the desired shielding effect. High-frequency electromagnetic waves (above 1 MHz) not only have the electromagnetic induction characteristics of low-frequency electromagnetic waves, but also have refractive and reflective properties that are rarely found in low-frequency electromagnetic waves. Therefore, the main control shield 24 is made of aluminum, which has good electrical conductivity.

[0045] The functional components include a rear camera 35, a rear macro camera 36, an infrared thermal imaging camera 12 and a flash 34, which are all installed on the main control board 26 near the side of the rear cover 17. One end of the rear camera 35, the rear macro camera 36, the infrared thermal imaging camera 12 and the flash 34 extends out of the main control shielding cover 24, and the rear camera 35, the rear macro camera 36, the infrared thermal imaging camera 12 and the flash 34 are all provided with shielding elements; a light outlet is opened on the rear cover 17 at the position corresponding to the flash 34, and a light shielding cover 23, The fixing frame 20 and the soft light cover 18, the light shield 23 is installed on the outer periphery of the flash 34 near the back cover 17, which can effectively block unnecessary light in the surrounding environment from entering the lens, prevent these stray lights from interfering with the light of the flash 34, and at the same time reduce the scattering of light to the surroundings, improve the contrast and clarity of the captured image, and make the color purer. The fixing frame 20 is installed at the light outlet, and the middle part of the fixing frame 20 is open and used for light transmission. The soft light cover 18 is installed on the fixing frame 20, and the fixing frame 20 is located between the light shield 23 and the soft light cover 18.

[0046] A front camera 28 is also installed at the upper end of the middle frame 8 to meet different camera needs.

[0047] The shielding element includes a copper-plated layer 37, a shielding window 19, a metal conductive mesh film 21 and a conductive foam layer 16, wherein:

[0048] A copper-plated layer 37 wraps around the outer ring of the main control board 26. One end of the copper-plated layer 37 extends to the upper end of the main control board 26 and makes close contact with the middle frame 8. The other end of the copper-plated layer 37 extends to the lower end of the main control board 26 and makes close contact with the main control shield 24. This ensures that the main control shield 24 effectively overlaps the copper-plated layer 37 on the lower end of the main control board 26, and also effectively overlaps the copper-plated layer 37 around the interface socket, fully blocking the electromagnetic waves generated by the main control board 26. This overall shielding of the main control board 26 not only meets the shielding effectiveness requirements, but also meets the functional requirements. As a preferred embodiment, the copper-plated layer 37 at the upper and lower ends of the main control board 26 is 3 mm wide, and a copper-plated layer 37 with a width of 3 mm is also designed around the interface socket.

[0049] The shielding window 19 is designed to have high shielding effectiveness across the entire wavelength range. A rear window is provided on the rear cover 17, corresponding to the positions of the rear camera 35 and the rear macro camera 36. The shielding window 19 is mounted on the inner side of the rear cover 17 and can cover both rear windows. The outer edge of the shielding window 19 is bonded to the inner side of the rear cover 17 with a high-performance conductive adhesive. For the rear camera 35, after capturing images through the shielding window 19, it can meet the user's requirements for shooting effects while also meeting the requirements for shielding effectiveness.

[0050] The metal conductive mesh 21 has high transparency. A copper foil ring around the metal conductive mesh 21 is attached without affecting the operation of the flash 34. This reduces electromagnetic emissions or related interference from the main control board 26 circuit, making any leakage of related electromagnetic emissions undetectable, thereby better meeting shielding requirements. The metal conductive mesh 21 is mounted on the side of the fixing frame 20 away from the light shield 23, with one side of the metal conductive mesh 21 contacting the diffuser 18. The diffuser 18 can significantly soften the light emitted by the flash 34, making it softer and more natural, thereby optimizing the shooting effect.

[0051] Conductive foam layer 16 is a 3D, omnidirectional conductive foam layer with a three-dimensional shielding effect. It surrounds the periphery of the image acquisition terminal of the infrared thermal imaging camera 12. One end of conductive foam layer 16 is in close contact with the base of the infrared thermal imaging camera 12, while the other end is in close contact with the inner wall of the back cover 17. The outer periphery of conductive foam layer 16 is in close contact with the main control shielding cover 24. During installation, the conductive foam layer 16 is compressed by tightening the screws between the back cover 17 and the middle frame 8. This compressive deformation of conductive foam layer 16 ensures electrical continuity and achieves a better shielding effect.

[0052] A germanium glass layer 15 is installed on the back cover 17 at the position corresponding to the infrared thermal imaging camera 12. The outer periphery of the germanium glass layer 15 is bonded to the back cover 17 by high-performance conductive adhesive. The germanium glass layer 15 can help the infrared thermal imaging camera 12 clearly detect targets in complex environments without being excessively disturbed by bad weather and environment, thereby improving the safety and accuracy of military operations.

[0053] The upper end face of the middle frame 8 is provided with a circle of limiting grooves, which are arranged close to the outer circle of the middle frame 8. The lower end face of the back cover 17 is provided with a circle of limiting protrusions, which are arranged close to the outer circle of the back cover 17. A circle of conductive rubber strips is embedded in the limiting grooves. The conductive rubber strips are preferably hollow aluminum silver-plated conductive rubber strips. The middle frame 8 and the back cover 17 are connected by screws, and the limiting protrusions can be embedded in the limiting grooves and press the conductive rubber strips. The concave-convex matching structure is used to extrude and deform the conductive rubber strip 32 to meet electrical continuity and achieve shielding effectiveness requirements.

[0054] In this embodiment, after the connection cable 27 on the main control board 26 is installed, the cable pressing plate 22 is used to screw and fix the connection cable 27 to ensure that the connection cable 27 will not move or shake at will, thereby ensuring the safety and stability of the connection cable 27 and better meeting the requirements of the ship vibration test.

[0055] The power supply element includes a battery 14 and a power supply board 9. The battery 14 is electrically connected to the power supply board 9. A power supply shielding cover 10 is also connected to the lower end of the middle frame 8. A power supply shielding cavity is formed between the power supply shielding cover 10 and the middle frame 8. The power supply board 9 is preferably directly mounted on the lower end of the middle frame 8 using screws, and the power supply board 9 is located in the power supply shielding cavity to achieve overall shielding of the power supply board 9. At the same time, since it is impossible for the main control shielding cover 24 of the power supply board 9 to fully contact the middle frame 8, they can only contact at certain points, which constitutes a hole arrangement. The gap is one of the main reasons for the degradation of the shielding performance of the shielded chassis. Therefore, an extrusion spring 33 is also provided at the contact position between the power supply shielding cover 10 and the middle frame 8. The power supply shielding cover 10 and the middle frame 8 can compress the extruded spring 33, and eliminate the non-contact points on the gap by extruding and deforming the spring 33, thereby meeting the electrical continuity and effectively blocking the electromagnetic waves generated by the power supply board 9. At the same time, the power supply board 9 is placed in an independent shielding cavity to meet the shielding efficiency requirements. The spring 33 is preferably made of beryllium copper material; the battery 14 is installed on the back cover 17, and a thermal conductive film with high thermal conductivity is installed between the battery 14 and the back cover 17. The thermal conductive film is preferably a graphene film, which can quickly dissipate the heat generated during the charging and discharging process of the battery 14 to the back cover 17, thereby preventing local overheating of the battery 14, improving the safety of the battery 14, and extending its service life.

[0056] In this embodiment, the cable shielding processing method is designed as a shielded cable, and the common-mode interference current injected into the cable can be guided to the ground through the grounding of the shielding layer, so that the signal and cable interface in the shielding layer are protected from external interference.

[0057] In the present embodiment, the battery 14 is preferably a 10000 mAh polymer battery, which can be used for 100 hours when discharged at a current of 100 mA.

[0058] The power supply shield 10 is provided with a plurality of ventilation holes. The size of the ventilation holes is designed so that when the size of the ventilation holes is larger than the wavelength corresponding to the highest interference frequency, electromagnetic waves can pass through without attenuation. The smaller the ventilation holes, the greater the attenuation of electromagnetic waves. Due to the superposition effect of interference, the more ventilation holes there are, the worse the shielding effectiveness. The smaller the spacing between adjacent ventilation holes, the worse the shielding effectiveness. Therefore, based on the frequency, type, and location of the electromagnetic waves generated by the power supply board 9, ventilation holes are designed on the power supply shield 10. The aperture of the ventilation holes is 2 mm, and the distance between adjacent ventilation holes is 4 mm. This ensures that the working heat of the components inside the power supply board 9 is dissipated in a timely manner while meeting the shielding effectiveness.

[0059] As a preferred solution, designing a filter circuit at the input end of the power supply board 9 can significantly reduce the level of conducted interference to meet the requirements of CE102 and prevent various circuits from interfering with each other when working in the low-emission handheld smart terminal, so that they can work compatibly with each other.

[0060] In actual use, the power supply board 9 generates low-frequency electromagnetic waves. The energy of these low-frequency electromagnetic waves is primarily composed of magnetic field energy. Therefore, it is the magnetic field component of these electromagnetic waves that should be shielded. The purpose of magnetic shielding is to prevent interference from low-frequency magnetic fields. The shielding body utilizes a highly permeable and highly saturated magnetic material to absorb or dissipate the electromagnetic field to achieve the shielding purpose. High magnetic permeability is as important as high electrical conductivity. Cold-rolled steel, as a good conductor, offers a satisfactory level of magnetic permeability while also providing significant mechanical strength at a low cost. Therefore, the power supply shield 10 is designed to be made of cold-rolled steel.

[0061] The low-emission handheld smart terminal in this embodiment features a modular internal design, with each module designed as an independent component. It supports fast charging and features a variety of function keys 5, which are mounted on the side of the middle frame 8 via a keypad 6, providing convenient user operation. A 6-pin port is also reserved on the side of the middle frame 8 for attaching a lanyard. A dedicated dock is also included, which, when plugged into the dock, enables charging and wired network access, providing convenient user experience.

[0062] A microphone 7, a loudspeaker 11 and an earpiece are also mounted on the outer shell, and a dustproof film 30 is also mounted on the earpiece.

[0063] In order to prevent various circuits from interfering with each other during operation and enable them to work compatibly with each other, the low-leakage handheld intelligent terminal in this embodiment is grounded after perfect overlap between each functional module, and the terminal of the AC power supply line is grounded. While effectively suppressing external electromagnetic fields, it can also protect the safety of equipment and personnel, thereby improving the electromagnetic compatibility of electronic equipment and ensuring the normal and reliable operation of electronic equipment.

[0064] The low-leakage handheld intelligent terminal in this embodiment prevents the leakage of electromagnetic information itself or during its use by means of electromagnetic protection, and performs corresponding processing on sensitive components and areas inside it, as well as circuit boards that generate signal sources, so that the signal electromagnetic transmission field of sensitive information is attenuated to a sufficiently small level that it is almost unreceivable. It not only has strong environmental adaptability, high reliability and maintainability, but also is compact, highly mobile and flexible, powerful in function, lightweight, easy to disassemble and assemble, and easy to carry, which can meet the relevant requirements of ship vibration and can be widely used in military, diplomatic, confidentiality, confidential, finance, public security, security and other fields.

[0065] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A low-radiation handheld intelligent terminal, characterized by: It includes an outer shell, an LCD mounting structure, a main control board shielding structure and a power supply element. The main control board shielding structure, the LCD mounting structure and the power supply element are all installed in the outer shell. The power supply element is used to provide power. The main control board shielding structure and the LCD mounting structure are both provided with a shielding module for providing electromagnetic shielding.

2. The low-radiation handheld intelligent terminal according to claim 1, characterized in that: The outer shell includes a front cover, a middle frame and a back cover that can be detachably connected from top to bottom. An upper cavity is formed between the front cover and the middle frame, and the upper cavity is used to install the LCD mounting structure. A lower cavity is formed between the middle frame and the back cover, and the lower cavity is used to install the main control board shielding structure and the power supply element.

3. The low-radiation handheld intelligent terminal according to claim 2, characterized in that: The LCD screen mounting structure includes a display screen assembly and a human body sensing switch. The human body sensing switch is installed on the middle frame and is electrically connected to the display screen assembly. The human body sensing switch can control the display screen assembly to be turned off according to whether a human body is sensed. The upper end surface of the middle frame is provided with a groove for installing the display screen assembly. The display screen assembly includes a capacitive touch screen, a liquid crystal display and a random mesh shielding film arranged in sequence from top to bottom. The random mesh shielding film is installed between the capacitive touch screen and the liquid crystal display, and the capacitive touch screen, the liquid crystal display and the random mesh shielding film are optically bound. A shielding element is provided at the contact position between the random mesh shielding film and the middle frame.

4. The low-radiation handheld intelligent terminal according to claim 3, characterized in that: The upper end surface of the middle frame is provided with a circle of embedding grooves, the embedding grooves are arranged close to the outer circle of the middle frame, and the shielding element is installed in the embedding grooves; the outer edge of the capacitive touch screen extends out of the liquid crystal display screen, and the random mesh shielding film covers the lower end surface of the capacitive touch screen. When the middle frame is connected to the front cover, the capacitive touch screen can press the random mesh shielding film and the shielding element above the embedding grooves, and the shielding element is located at the lower end of the random mesh shielding film; the display screen assembly also includes a touch control board, a filter circuit is provided on the touch control board, a shielding chamber body is provided between the lower end of the liquid crystal display screen and the upper end surface of the middle frame, the touch control board is installed in the shielding chamber body, and the touch control board is electrically connected to the liquid crystal display screen through a flexible flat cable.

5. The low-radiation handheld intelligent terminal according to claim 3, characterized in that: The upper end surface of the middle frame is also provided with a sensing groove, and the human body sensing switch is installed in the sensing groove. The middle frame is provided with a wire outlet hole, and the wire outlet hole is used for the connection cable of the human body sensing switch to pass through. The connection cable is wrapped with a conductive cloth at the outer periphery of the position corresponding to the wire outlet hole, and the conductive cloth is filled between the inner wall of the wire outlet hole and the outer wall of the connection cable; the sensing angle of the human body sensing switch is 45° to 45°, and the sensing distance of the human body sensing switch is within 0.3m.

6. The low-radiation handheld intelligent terminal according to claim 2, characterized in that: The main control board shielding structure includes a main control board and functional devices. The inner side of the middle frame is provided with an installation groove for installing the main control board. The back cover is buckled on one side of the middle frame, and an installation chamber is formed between the back cover and the middle frame. The main control board is located in the installation chamber, and the functional devices are installed on the main control board. The shielding module on the main control board shielding structure includes a main control shielding cover and a shielding element. The main control shielding cover is installed on the side of the main control board close to the back cover, and a shielding chamber is formed between the main control shielding cover and the main control board. The functional devices are installed in the shielding chamber, and the shielding element is installed on the periphery of the main control board and the functional devices.

7. The low-radiation handheld intelligent terminal according to claim 6, characterized in that: The functional devices include a rear camera, a rear macro camera, an infrared thermal imaging camera and a flash, all of which are installed on the main control board on the side close to the back cover. One end of the rear camera, the rear macro camera, the infrared thermal imaging camera and the flash extends out of the main control shielding cover, and the rear camera, the rear macro camera, the infrared thermal imaging camera and the flash are all provided with the shielding element; a light outlet is provided on the back cover at a position corresponding to the flash, and a light shield, a fixing bracket and a soft light shield are provided at the flash, the light shield is installed on the outer periphery of the flash on the side close to the back cover, the fixing bracket is installed at the light outlet, and the middle part of the fixing bracket is opened and used for light transmission, the soft light shield is installed on the fixing bracket, and the fixing bracket is located between the light shield and the soft light shield.

8. The low-radiation handheld intelligent terminal according to claim 7, characterized in that: The shielding element includes a copper-plated layer, a shielding window, a metal conductive mesh and a conductive foam layer. The copper-plated layer is coated on the outer ring of the main control board, and one end of the copper-plated layer extends to the upper end surface of the main control board and is in close contact with the middle frame. The other end of the copper-plated layer extends to the lower end surface of the main control board and is in close contact with the main control shielding cover; a rear window is provided on the back cover corresponding to the position of the rear camera and the rear macro camera, the shielding window is installed on the inner side of the back cover, and the shielding window can cover the two rear windows, and the outer edge of the shielding window is bonded and fixed to the inner side of the back cover Fixed; the metal conductive mesh is installed on the side of the fixing frame away from the light shield, and one side of the metal conductive mesh is in contact with the soft light cover; the conductive foam layer is arranged around the periphery of the image acquisition end of the infrared thermal imaging camera, and one end of the conductive foam layer is in close contact with the base of the infrared thermal imaging camera, the other end of the conductive foam layer is in close contact with the inner wall of the back cover, and the periphery of the conductive foam layer is in close contact with the main control shielding cover; the back cover is provided with a germanium glass layer at a position corresponding to the infrared thermal imaging camera, and the periphery of the germanium glass layer is bonded to the back cover by conductive glue.

9. The low-radiation handheld intelligent terminal according to claim 2, characterized in that: The power supply element includes a battery and a power supply board, the battery is electrically connected to the power supply board, and a power supply shielding cover is also connected to the lower end of the middle frame. A power supply shielding cavity is formed between the power supply shielding cover and the middle frame. The power supply board is installed at the lower end of the middle frame and is located in the power supply shielding cavity. An extrusion spring is also provided at the contact position between the power supply shielding cover and the middle frame. The power supply shielding cover and the middle frame can compress the extrusion spring; the battery is installed on the back cover, and a heat-conductive film is installed between the battery and the back cover.

10. The low-radiation handheld intelligent terminal according to claim 9, characterized in that: The power supply shielding cover is provided with a plurality of ventilation holes, each of which has a diameter of 2 mm and a distance between adjacent ventilation holes of 4 mm.

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