Low-leakage mouse

Abstract

The invention discloses a low-leakage mouse, and belongs to the technical field of mouses.The low-leakage mouse comprises a mouse body and a mouse cable, the mouse body comprises a mouse shell and a PCB, the PCB is arranged in the mouse shell, a bus bar on the front face of the PCB covers and is in lap joint with a first metal shell, a bus bar on the back face of the PCB covers and is in lap joint with a second metal shell, and the first metal shell and the second metal shell are in lap joint. The first metal shell is provided with a cable passing hole for a mouse cable. The first metal shell and the second metal shell are arranged on the circuit bus bars on the front face and the back face of the PCB in a covering and lap joint mode respectively, so that shielding cavities are formed in the circuits on the front face and the back face of the PCB, electromagnetic wave leakage of the circuits is avoided, meanwhile, a mouse cable is replaced by a shielding cable, and therefore the shielding effect is improved. The electromagnetic waves of the signal line and the power line can be suppressed through the shielding layer, and the leakage of the electromagnetic waves at the cable is avoided, so that the electromagnetic shielding protection level is greatly improved, and the anti-radiation effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of mice, in particular to a low-leakage mouse. Background Art

[0002] With the rapid development of the information industry, the mouse has been widely used in highly confidential office systems for information input. The mouse is an input device for the computer and an indicator of the comprehensive coordinate positioning of the computer display system. When working, it can generate strong electromagnetic radiation. The radiated electromagnetic field not only interferes with various electronic devices, but also the information of electromagnetic radiation can be easily intercepted and reproduced. Therefore, it is necessary to improve the existing mouse and enhance its electromagnetic shielding protection level to overcome the problem that important information is easily stolen due to its strong electromagnetic radiation. Summary of the invention

[0003] The purpose of the present invention is to solve the above-mentioned technical problems and provide a low-leakage mouse. After the first metal shell and the second metal shell are overlapped with the circuit bus bar of the PCB circuit board, a shielding cavity for the circuit can be formed to avoid leakage of electromagnetic waves from the circuit. At the same time, the mouse cable is replaced with a shielded cable to avoid leakage of electromagnetic waves from the cable, thereby greatly improving the electromagnetic shielding protection level and the anti-radiation effect.

[0004] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses a low-leakage mouse, including a mouse body and a mouse cable, the mouse body including a mouse shell and a PCB circuit board, the PCB circuit board is built in the mouse shell, the front bus bar of the PCB circuit board is covered and overlapped with a first metal shell, the back bus bar of the PCB circuit board is covered and overlapped with a second metal shell, and the first metal shell is provided with a cable passage hole for the mouse cable.

[0005] Preferably, the first metal shell and the second metal shell are subjected to conductive treatment.

[0006] Preferably, the PCB circuit board includes a filtering function module, a USB drive interface, a mouse infrared pair tube, a mouse controller, a left mouse button, a right mouse button, a mouse wheel button and a mouse encoder. The USB drive interface, the mouse infrared pair tube, the left mouse button, the right mouse button, the mouse wheel button and the mouse encoder are electrically connected to the mouse controller through the filtering function module respectively, the mouse cable is connected to the USB drive interface, and the filtering function module, the USB drive interface, the mouse infrared pair tube and the mouse controller are located within the covering range of the first metal shell.

[0007] Preferably, the filtering function module includes a through-hole capacitor.

[0008] Preferably, the mouse body comprises an optical lens, the optical lens is fixed in the second metal shell, a light-transmitting hole is provided in the second metal shell, and the optical lens is electrically connected to the mouse controller.

[0009] Preferably, the PCB circuit board includes a first layer of printed boards, a second layer of printed boards, a third layer of printed boards and a fourth layer of printed boards, the front bus bar, the filtering function module, the USB drive interface, the mouse infrared pair tube, the mouse controller, the left mouse button, the right mouse button, the mouse wheel button, and the mouse encoder are located on the first layer of printed boards, the board surface of the first layer of printed boards is subjected to network copper cladding treatment, the board surface of the second layer of printed boards is provided with a casing ground plane layer, the casing ground plane layer is grounded, the third layer of printed boards is used for wiring of key signals, the back bus bar is located on the fourth layer of printed boards, the board surface of the fourth layer of printed boards is provided with a signal ground plane layer, and the signal ground plane layer is grounded.

[0010] Preferably, the mouse cable includes a power line and a signal line, and the power line is grounded.

[0011] Preferably, the signal line is a mutually insulated twisted pair cable, and the mouse cable includes four shielding layers.

[0012] Preferably, the mouse cable is a shielded cable.

[0013] Preferably, the shielding layer of the mouse shell and the shielded cable are overlapped with the metal foil of the cable itself, the shielded cable is welded to the first metal shell by soldering, and the shielded cable is fixed to the PCB circuit board by a metal clip, and the metal clip covers the cable through a hole and overlaps it.

[0014] Preferably, the wiring design of the third layer of printed circuit board strictly controls the routing length, limits the wiring area, strictly controls the equal length, width and spacing of differential lines, impedance matching, and source suppression protection measures to ensure the impedance continuity and signal integrity of the signal. When wiring, the signal is kept away from the gap between the first metal shell, the second metal shell and the PCB circuit board.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The present invention provides a low-leakage mouse, which forms a shielding cavity on the circuits on the front and back of the PCB circuit board by respectively covering and overlapping the circuit bus bars on the front and back of the PCB circuit board with a first metal shell and a second metal shell, thereby preventing leakage of electromagnetic waves from the circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of a low-leakage mouse in an embodiment;

[0019] Figure 2 Schematic diagram of the front view structure of the low-leakage mouse in the embodiment;

[0020] Figure 3 Schematic diagram of the side view structure of the low-leakage mouse in the embodiment;

[0021] Figure 4 Schematic diagram of the structure of a low-leakage mouse in an embodiment;

[0022] Figure 5 is an exploded view of a low-leakage mouse in an embodiment;

[0023] Figure 6 is a schematic diagram of the three-dimensional structure of a PCB circuit board in the embodiment;

[0024] Figure 7 Schematic diagram of the top view of the PCB circuit board in the embodiment;

[0025] Figure 8 is a circuit schematic diagram of a PCB circuit board in the embodiment;

[0026] Fig. 9 Schematic diagram of the structure of the first layer of the PCB circuit board in the embodiment;

[0027] Fig.10 Schematic diagram of the structure of the second layer of the PCB circuit board in the embodiment;

[0028] Fig.11 Schematic diagram of the structure of the third layer of the PCB circuit board in the embodiment;

[0029] Fig.12 It is a schematic structural diagram of the fourth layer printed board of the PCB circuit board in the embodiment.

[0030] Description of reference numerals:

[0031] 1. Upper shell; 2. Lower shell; 3. Double-sided tape; 4. Roller; 5. Optical lens; 6. Counterweight; 7. PCB circuit board; 8. First metal shell; 9. Second metal shell; 10. Metal buckle; 11. Mouse cable;

[0032] 110, roller outlet;

[0033] 210, cable outlet; 211, light transmission port;

[0034] 71. Filter function module; 72. USB drive interface; 73. Front bus bar; 74. Mouse infrared pair tube; 75. Mouse controller; 76. Left mouse button; 77. Mouse wheel button; 78. Right mouse button; 79. Mouse encoder;

[0035] 710, first layer printed circuit board; 711, second layer printed circuit board; 712, third layer printed circuit board; 713, fourth layer printed circuit board. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0037] This embodiment provides a low-emission mouse, such as Figures 1 to 12 As shown, it includes a mouse body and a mouse cable 11. The mouse body includes a mouse shell and a PCB circuit board 7, and the PCB circuit board 7 is built in the mouse shell. The front bus bar 73 of the PCB circuit board 7 is covered and overlapped with a first metal shell 8 to form a shielding cavity. The back bus bar of the PCB circuit board 7 is covered and overlapped with a second metal shell 9 to form a shielding cavity. The first metal shell 8 is provided with a cable through hole for the mouse cable 11 to pass through the first metal shell 8. After the first metal shell 8, the second metal shell 9 and the circuit bus bars of the PCB circuit board 7 are overlapped, a shielding cavity is formed on the front and back circuit bus bars of the PCB circuit board 7, forming a good shielding structure to prevent electromagnetic wave leakage of the circuit.

[0038] In one embodiment, if Figures 1 to 12 As shown, the first metal shell 8 and the front bus bar 73, and the second metal shell 9 and the back bus bar are connected by welding. Of course, if there are other fixing methods, other fixing methods can also be used.

[0039] Further, in one embodiment, if Figures 1 to 12 As shown, the opening ends of the first metal shell 8 and the second metal shell 9 are both provided with positioning plugs, and the front bus bar 73 and the back bus bar are both provided with positioning slots. The positioning plugs and the positioning slots are plugged in and matched to facilitate positioning, which is conducive to precise welding.

[0040] Further, in one embodiment, if Figures 1 to 12 As shown, the metal buckle 10 and the PCB circuit board 7 are fixed by welding. Of course, other fixing methods can also be used if there are other fixing methods.

[0041] Further, in one embodiment, if Figures 1 to 12 As shown, the metal foil is copper foil, and the first metal shell 8 and the second metal shell 9 are made of copper. Of course, the metal foil and the metal shell do not exclude other metal materials.

[0042] Further, in one embodiment, if Figures 1 to 12 As shown, the first metal shell 8 and the second metal shell 9 are treated with conductive treatment. After the front bus bar 73 and the back bus bar of the PCB circuit board 7 are overlapped with the first metal shell 8 and the second metal shell 9 respectively, the sealing and conductive continuity of the shielding shell are effectively solved.

[0043] In one embodiment, if Figures 1 to 12 As shown, the PCB circuit board 7 includes a filtering function module 71, a USB drive interface 72, a mouse infrared pair tube 74, a mouse controller 75, a left mouse button 76, a mouse wheel button 77, a right mouse button 78, and a mouse encoder 79. The USB drive interface 72, the mouse infrared pair tube 74, the left mouse button 76, the right mouse button 78, the mouse wheel button 77, and the mouse encoder 79 are electrically connected to the mouse controller 75 through the filtering function module 71. The mouse cable 11 is connected to the USB drive interface 72, and the filtering function module 71, the USB drive interface 72, the mouse infrared pair tube 74, and the mouse controller 75 are located within the cover range of the first metal shell 8. The mouse cable 11 will input information signals or power signals through the USB driver interface 72. The information signals or power signals will be filtered by the filtering function module 71 and connected to the mouse controller 75, which can eliminate the influence of the lead inductance and filter out part of the noise brought in, thereby solving the influence of external interference noise on the mouse control signal. In addition, the filtering function module 71 also effectively prevents high-frequency signals from coupling from the input end to the mouse controller 75, providing an excellent suppression effect.

[0044] In one embodiment, if Figures 1 to 12 As shown, the filtering function module 71 includes a through-hole capacitor. Compared with the traditional LC filtering module, filtering through the through-hole capacitor has relatively small loss, good out-of-band selection performance, large power capacity, small size, and small board space occupation. It can also compensate for the impact of other components' lack of adaptability to the operating temperature, greatly improving the stability of the filtering module.

[0045] Further, in one embodiment, if Figures 1 to 12As shown, the mouse controller 75 is the core component of the mouse operation, and is a light flow sensor used to collect light displacement information. When the mouse is moved, it can convert the information of the moving distance and direction into pulses and send them to the computer, and the computer then converts the pulses into the coordinate data of the mouse cursor, thereby achieving the purpose of indicating the position. The left mouse button 76, the right mouse button 78 and the mouse wheel button 77 for pressing the scroll wheel down use spring touch buttons. The mouse encoder 79 is an AB phase digital encoder, which is used for scroll wheel operation. Because it is necessary to distinguish between forward and reverse rotation, the AB phase is used. The mouse infrared pair tube 74 is a red LED, which is used to generate a light source.

[0046] In one embodiment, if Figures 1 to 12 As shown, the mouse body includes an optical lens 5, and the optical lens 5 is electrically connected to the mouse controller 75. The optical lens 5 is fixed in the second metal shell 9. Fixing the lens can avoid the mouse pointer from shaking and enhance the impact resistance and vibration resistance of the mouse. The second metal shell 9 is provided with a light-transmitting hole for the mouse infrared pair tube 74 to emit infrared light outward and for the optical lens 5 to receive infrared light.

[0047] In one embodiment, if Figures 1 to 12As shown, the PCB circuit board 7 is designed in a stacked manner during the design process. The PCB circuit board 7 includes a first layer of printed boards 710, a second layer of printed boards 711, a third layer of printed boards 712, and a fourth layer of printed boards 713. The filter function module 71, the USB drive interface 72, the front bus bar 73, the mouse infrared pair tube 74, the mouse controller 75, the left mouse button 76, the mouse wheel button 77, the right mouse button 78, and the mouse encoder 79 are located on the first layer of printed boards 710. The surface of the first layer of printed boards 710 is treated with network copper cladding to shield the external signal interference and play the role of electromagnetic shielding. The surface of the second layer of printed boards 711 is provided with a housing ground plane layer, which covers the entire surface of the second layer of printed boards 711. The housing ground plane layer is grounded to form a shielding layer, and its plane is used to provide a complete reference plane for wiring, which well suppresses the common mode interference inherent in the circuit board. The third layer of printed boards 712 is used for wiring of key signals. The back bus bar is located on the fourth layer of printed board 713. The surface of the fourth layer of printed board 713 is provided with a signal ground plane layer. The signal ground plane layer is grounded. The signal ground plane layer covers the entire fourth layer of printed board 713, which not only provides a complete reference plane for the signal line, but also forms a complete shielding net to provide protection for the key signal of the third layer of printed board 712, ensuring the performance of electromagnetic protection. The third layer of printed board 712 is used as the wiring of the key signal because it can make full use of the absorption of electromagnetic waves by the housing ground plane layer of the second layer of printed board 711 and the signal ground plane layer of the fourth layer of printed board 713, so that the radiation leaked from the wiring is minimal. The above-mentioned stacking design adopts a multi-layer board structure, so that all signal routings of the PCB circuit board 7 have a complete reference plane, ensuring that the key signal has two layers of reference planes (the second layer of printed board 711 and the fourth layer of printed board 713), so that the signal shielding and anti-interference capabilities are further improved. At the same time, there is no signal crosstalk between two adjacent layers, and the key signals are all wired in the inner layer, reducing the influence of far-end crosstalk.

[0048] In one embodiment, if Figures 1 to 12 As shown, the mouse cable 11 includes a power line and a signal line, and the power line is grounded. In this way, the ground signal of the low-leakage mouse is also independently divided into the chassis ground (chassis ground plane layer), the power ground and the signal ground (signal ground plane layer), which minimizes the crosstalk between the signals. The power ground, signal ground and shielding ground are independent, ensuring the integrity of the signal, less noise interference and maintaining the stability of the circuit.

[0049] In one embodiment, if Figures 1 to 12As shown, the mouse cable 11 adopts a shielded cable. The shielding layer can suppress the electromagnetic waves of the signal line and the power line, thereby shielding the circuit of the cable and avoiding the leakage of electromagnetic waves from the cable, thereby improving the shielding effectiveness, reducing the risk of information leakage, and improving the electromagnetic shielding protection level and anti-radiation effect.

[0050] In one embodiment, if Figures 1 to 12 As shown, a cable outlet 210 is provided on the mouse housing, and the shielded cable (mouse cable 11) passes through the cable outlet 210, and the shielding layer of the shielded cable (mouse cable 11) is overlapped with the cable outlet 210 through the metal foil of the cable itself, thereby improving the overall shielding efficiency of the mouse while ensuring normal communication of the mouse. The shielded cable (mouse cable 11) is welded to the first metal housing 8 by soldering. The shielded cable (mouse cable 11) is fixed to the PCB circuit board 7 by a metal buckle 10, and the metal buckle 10 is set and overlapped inside the cable through the hole cover, and in this way, the shielding of the outlet position of the first metal housing 8 is realized to perform electromagnetic protection.

[0051] In one embodiment, if Figures 1 to 12 As shown, the ground plane layer of the casing is connected to the shielding layer of the mouse cable 11, which can enhance the overall grounding performance, reduce the grounding resistance, ensure signal integrity, and prevent the occurrence of crosstalk problems.

[0052] In one embodiment, if Figures 1 to 12 As shown, the wiring design of the third layer of printed circuit board 712 strictly controls the length of the routing, effectively shortens the length of the signal, ensures the rate and integrity of signal transmission, and avoids the influence of signal reflection and overshoot caused by branches or stumps. Strictly control the equal length, width and spacing of the differential lines to ensure that the two differential signals always maintain opposite polarity, reduce the common mode component, and greatly improve the anti-interference ability. Limit the wiring area, and design a special area for wiring to avoid signal interference in other areas. At the same time, EMC protection measures are taken during the wiring process. During wiring, the signal is kept away from the gap between the first metal shell 8, the second metal shell 9 and the PCB circuit board 7 to reduce the influence of gap leakage. Strictly control impedance matching and source suppression protection measures to ensure the impedance continuity and signal integrity of the signal. For example, the impedance of the single-ended line is designed to be 50Ω±10%, and the impedance of the differential line is designed to be 90Ω±10%. The signal integrity problems such as signal reflection and crosstalk during the transmission of high-speed signals are solved.

[0053] In one embodiment, if Figures 1 to 12As shown, the mouse housing includes an upper housing 1 and a lower housing 2, and the upper housing 1 and the lower housing 2 are connected by screws. The PCB circuit board 7 is installed in the lower housing 2. The bottom of the lower housing 2 is provided with a light-transmitting port 211 for the mouse infrared pair tube 74 to emit infrared light outward and for the optical lens 5 to receive infrared light. The cable outlet 210 is located on the lower housing 2. The optical lens 5 is installed at the bottom of the PCB circuit board 7, the double-sided tape 3 is installed at the bottom of the optical lens 5, and the second metal housing 9 is installed at the bottom of the PCB circuit board 7, and the optical lens 5 and the second metal housing 9 are bonded by the double-sided tape 3. A roller 4 is installed on the mouse encoder 79 of the PCB circuit board 7, and a roller outlet 110 for the roller 4 to extend is provided on the upper housing 1. A counterweight 6 is installed in the upper housing 1 and fixed by screws.

[0054] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A low-leakage mouse, comprising a mouse body and a mouse cable, wherein the mouse body comprises a mouse housing and a PCB circuit board, wherein the PCB circuit board is built in the mouse housing, characterized in that: The front bus bar of the PCB circuit board is covered and overlapped with a first metal shell, and the back bus bar of the PCB circuit board is covered and overlapped with a second metal shell. The first metal shell is provided with a cable passing hole for a mouse cable.

2. A low-emission mouse according to claim 1, characterized in that: The first metal shell and the second metal shell are subjected to conductive treatment.

3. A low-emission mouse according to claim 1 or 2, characterized in that: The PCB circuit board includes a filtering function module, a USB drive interface, a mouse infrared pair tube, a mouse controller, a left mouse button, a right mouse button, a mouse wheel button and a mouse encoder. The USB drive interface, the mouse infrared pair tube, the left mouse button, the right mouse button, the mouse wheel button and the mouse encoder are electrically connected to the mouse controller through the filtering function module respectively. The mouse cable is connected to the USB drive interface. The filtering function module, the USB drive interface, the mouse infrared pair tube and the mouse controller are located within the covering range of the first metal shell.

4. A low-emission mouse according to claim 3, characterized in that: The filtering function module includes a through-hole capacitor.

5. The low-leakage mouse according to claim 3, characterized in that: The mouse body comprises an optical lens, and the optical lens is fixed in the second metal shell. The second metal shell is provided with a light-transmitting hole, and the optical lens is electrically connected to the mouse controller.

6. The low-emission mouse according to claim 3, characterized in that: The PCB circuit board includes a first layer of printed boards, a second layer of printed boards, a third layer of printed boards and a fourth layer of printed boards. The front bus bar, the filtering function module, the USB drive interface, the mouse infrared pair tube, the mouse controller, the left mouse button, the right mouse button, the mouse wheel button and the mouse encoder are located on the first layer of printed boards. The board surface of the first layer of printed boards is subjected to network copper cladding treatment. The board surface of the second layer of printed boards is provided with a casing ground plane layer, and the casing ground plane layer is grounded. The third layer of printed boards is used for wiring of key signals. The back bus bar is located on the fourth layer of printed boards. The board surface of the fourth layer of printed boards is provided with a signal ground plane layer, and the signal ground plane layer is grounded.

7. The low-emission mouse according to claim 6, characterized in that: The mouse cable comprises a power line and a signal line, and the power line is grounded.

8. The low-emission mouse according to claim 8, characterized in that: The mouse cable is a shielded cable.

9. The low-emission mouse according to claim 8, characterized in that: The shielding layers of the mouse shell and the shielded cable are overlapped with the metal foil of the cable itself, the shielded cable is welded to the first metal shell by soldering, and the shielded cable is fixed to the PCB circuit board by a metal clip, and the metal clip covers the cable through a hole and overlaps it.

10. The low-emission mouse according to claim 6, characterized in that: The wiring design of the third layer printed circuit board strictly controls the routing length, limits the wiring area, strictly controls the equal length, width and spacing of the differential lines, impedance matching, and source suppression protection measures to ensure the impedance continuity and signal integrity of the signal. When wiring, the signal is kept away from the gap between the first metal shell, the second metal shell and the PCB circuit board.

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