Key module with anti-disassembly function and electronic equipment
By integrating anti-tamper functionality into the light guide plate, the problems of complex button module structure and increased thickness were solved, achieving the effects of simplified structure and reduced cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-03
AI Technical Summary
In the existing technology, the button module of electronic devices has a complex structure and is relatively thick due to the anti-tamper plate superimposed on the light guide plate, which increases the cost and assembly difficulty.
The anti-tamper function is integrated into the light guide plate, giving it both light guiding and anti-tamper functions. Safety protection is achieved through wiring detection on the light guide plate, eliminating the need for the anti-tamper plate in traditional solutions.
The structure of the button module has been simplified, the thickness has been reduced, production costs and assembly difficulty have been lowered, and safety protection functions have been achieved at the same time.
Smart Images
Figure CN224082360U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic device security protection technology, and in particular to a button module and electronic device with anti-tamper function. Background Technology
[0002] In related technologies, the button module of electronic devices typically includes buttons, a motherboard, a button board, a light guide plate, and a light source. The button board can respond to the user's pressing of the button and generate a corresponding electrical signal. The motherboard can analyze the electrical signal and execute corresponding operations. The light guide plate can evenly conduct the light emitted by the light source to the button area to make the button light up. For financial / payment devices such as POS machines, an anti-tamper plate is also required on the light guide plate to prevent the financial / payment device from being maliciously disassembled, thereby ensuring the security of the financial / payment device. However, adding an anti-tamper plate to the light guide plate makes the button module structure complex and thicker, ultimately increasing the cost and assembly difficulty. Utility Model Content
[0003] This application provides a button module and electronic device with anti-tamper function, aiming to solve the problem that button modules with anti-tamper plates in related technologies have complex structures and are relatively thick overall.
[0004] To address the aforementioned drawbacks in related technologies, this application provides a button module with anti-tamper functionality, comprising a main circuit board, a button circuit board, a light guide plate, a light source, and a button panel. The button circuit board is disposed on and electrically connected to the main circuit board. The light guide plate is disposed on the button circuit board, and the button panel is disposed on the light guide plate. The button panel has multiple buttons, and the button circuit board has multiple conductive contacts. Each of the multiple buttons has a conductive portion penetrating the button panel. The multiple conductive portions penetrate the light guide plate and extend above the multiple conductive contacts. The light source is disposed on the button circuit board and electrically connected to the main circuit board. The surface of the light guide plate facing the button panel has traces electrically connected to the main circuit board. The light source is used to emit light from the light guide plate; the light guide plate is used to uniformly transmit light to the button panel; the conductive part is used to make electrical contact with the conductive contact when the button is pressed; the button circuit board is used to identify the user's pressing of each button and generate corresponding electrical signals based on the electrical contact between the conductive contact and the conductive part; the main circuit board is used to analyze the electrical signals and perform corresponding operations, as well as to detect whether the wiring is broken in real time and trigger a preset safety protection mechanism when it is broken.
[0005] In some implementations, the button module also includes a pad, which is placed on the button circuit board. A light guide plate is placed on the pad, and multiple conductive parts pass through the light guide plate and the pad in sequence and extend above the multiple conductive contacts. An annular gap is formed between the button circuit board and the light guide plate, surrounding the pad. The light source is placed on the surface of the button circuit board facing the light guide plate and located within the annular gap.
[0006] In some implementations, the light source includes multiple light-emitting units for emitting light and electrically connected to the main circuit board. These multiple light-emitting units are spaced apart and distributed along at least one side of the keypad circuit board. Each light-emitting unit distributed along the same side of the keypad circuit board corresponds to the same side of a light guide plate. Further, each side of the light guide plate corresponding to the light-emitting units has a light guide portion extending towards the keypad circuit board, which guides the light emitted by the light-emitting units into the light guide plate. Further, the light-emitting unit includes at least one light-emitting diode (LED); wherein, when the light-emitting unit includes multiple LEDs, the multiple LEDs are arranged in a predetermined pattern.
[0007] In some implementation schemes, the light guide plate has multiple first through holes corresponding to multiple conductive parts, and the pad plate has multiple second through holes corresponding to multiple first through holes. Multiple conductive contacts are located in multiple second through holes, and the conductive parts pass through the first through holes and extend above the conductive contacts.
[0008] In some implementations, the button module also includes a button bracket, which is mounted on the main circuit board, and the button circuit board is mounted on the button bracket.
[0009] In some implementations, the button module also includes a conductive component. One end of the conductive component is located on the main circuit board, and the other end of the conductive component passes through the button bracket, the button circuit board, and the pad in sequence, extending to the light guide plate for electrical connection of the wiring. Further, the conductive component is a zebra stripe.
[0010] The second aspect of this application provides an electronic device, including a housing and a button module provided in the first aspect of this application. The housing has a plurality of button holes, and the ends of the plurality of buttons in the button module that are away from the button panel pass through the plurality of button holes through the housing.
[0011] The button module provided in the first aspect of this application comprises a light source, a light guide plate, a button circuit board, a main circuit board, and a button panel. The button circuit board is disposed on the main circuit board and electrically connected to the main circuit board. The light guide plate is disposed on the button circuit board, and the button panel is disposed on the light guide plate. The button panel is provided with multiple buttons, and the button circuit board is provided with multiple conductive contacts. Each of the multiple buttons has a conductive part that penetrates the button panel. The multiple conductive parts penetrate the light guide plate and extend above the multiple conductive contacts. The light source is disposed on the button circuit board and electrically connected to the main circuit board. The surface of the light guide plate facing the button panel has traces that are electrically connected to the main circuit board. In practical applications, the main circuit board controls the light source to emit light through the light guide plate. The light guide plate evenly transmits the emitted light to the button panel, causing the button panel to emit light. The conductive parts make electrical contact with the corresponding conductive contacts when the user presses a button. The button circuit board identifies the user's button press based on the electrical contact between each conductive contact and the corresponding conductive part, generates a corresponding electrical signal, and transmits the signal to the main circuit board. The main circuit board not only analyzes the electrical signals from the button circuit board and performs corresponding operations, but also detects in real time whether the traces on the light guide plate are broken, triggering a preset safety protection mechanism when a break occurs. Therefore, compared to traditional solutions that use a light guide plate and an anti-tamper plate to achieve light guiding and anti-tamper functions respectively, this application integrates the anti-tamper function into the light guide plate. That is, the light guide plate of this application simultaneously possesses both light guiding and anti-tamper functions, thus eliminating the need for the anti-tamper plate found in traditional solutions. This simplifies the button module structure, reduces the button module thickness, and consequently lowers the production cost and assembly difficulty of the button module.
[0012] The electronic device provided in the second aspect of this application has all the advantages of the button module provided in the first aspect of this application since it includes the button module provided in the first aspect of this application. Attached Figure Description
[0013] To more clearly illustrate the related technologies or the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the related technologies or the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application, and not all embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of the button module provided in the embodiments of this application;
[0015] Figure 2 This is an exploded view of the button module provided in an embodiment of this application;
[0016] Figure 3 Provided for the embodiments of this application Figure 2A magnified view of a section at point A in the middle;
[0017] Figure 4 This is another exploded view of the button module provided in the embodiments of this application;
[0018] Figure 5 Provided for the embodiments of this application Figure 4 A magnified view of a section at point B in the middle;
[0019] Figure 6 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application;
[0020] Figure 7 An exploded view of the electronic device provided in the embodiments of this application.
[0021] The labels in the above figures are as follows: 1-Main circuit board, 2-Button circuit board, 3-Light guide plate, 4-Light source, 5-Button panel, 6-Pad plate, 7-Button bracket, 8-Conductive component, 9-Housing, 21-Conductive contact, 31-First through hole, 41-Light-emitting unit, 51-Button, 511-Conductive part, 61-Second through hole, 91-Button hole. Detailed Implementation
[0022] In related technologies, the button module of an electronic device typically includes a button, a motherboard, a button board, a light guide plate, and a light source. The button board responds to the user's pressing of the button and generates a corresponding electrical signal. The motherboard analyzes the electrical signal and executes corresponding operations. The light guide plate evenly transmits the light emitted by the light source to the button area to make the button illuminate. However, for financial / payment devices such as POS machines, an anti-tamper plate is also needed to be superimposed on the light guide plate to prevent malicious disassembly of the financial / payment device and thus ensure its security. However, superimposing an anti-tamper plate on the light guide plate makes the button module structure complex and thicker, ultimately increasing the production cost and assembly difficulty of the button module. In view of this, the embodiments of this application propose a button module and electronic device with anti-tamper function to solve the above-mentioned drawbacks of related technologies.
[0023] To make the objectives, technical solutions, and advantages of this application more apparent and understandable, this application will be clearly and completely described below in conjunction with its embodiments and corresponding drawings. Throughout, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. It should be understood that the embodiments of this application described below are only for explaining this application and are not intended to limit this application. That is, all other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0024] Please see Figures 1 to 5 , Figure 1 This is a structural diagram of the button module. Figure 2 This is an exploded view of the button module. Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle. Figure 4 This is another exploded view of the button module. Figure 5 yes Figure 4 A partial enlarged view at point B. This embodiment provides a button module with anti-tamper function. The button module includes a main circuit board 1, a button circuit board 2, a light guide plate 3, a light source 4, and a button panel 5. The button circuit board 2 is disposed on the main circuit board 1 and electrically connected to the main circuit board 1. The light guide plate 3 is disposed on the button circuit board 2, and the button panel 5 is disposed on the light guide plate 3. The button panel 5 has multiple buttons 51. The button circuit board 2 has multiple conductive contacts 21. Each of the multiple buttons 51 has a conductive part 511 that penetrates the button panel 5 in the direction of the light guide plate 3. The multiple conductive parts 511 all penetrate the light guide plate 3 in the direction of the button circuit board 2 and extend above the multiple conductive contacts 21. The light source 4 is disposed on the button circuit board 2 and electrically connected to the main circuit board 1. The surface of the light guide plate 3 facing the button panel 5 is printed with traces electrically connected to the main circuit board 1 (not shown in the figure). Preferably, the traces on the light guide plate 3 are printed using indium tin oxide (ITO), which has strong light transmittance and good conductivity.
[0025] In this embodiment, the main circuit board 1 can control the light source 4 to emit light to the light guide plate 3. The light guide plate 3 can uniformly conduct the light emitted by the light source 4 to the key panel 5, so that the key panel 5 emits light. Each conductive part 511 can move towards the corresponding conductive contact 21 when the user presses the key 51 and make electrical contact with the corresponding conductive contact 21 when it reaches the position. The key circuit board 2 can identify the user's press of each key 51 based on the electrical contact between each conductive contact 21 and the corresponding conductive part 511, and transmit the electrical signal to the main circuit board 1 after generating the corresponding electrical signal. The main circuit board 1 can not only analyze the electrical signal from the key circuit board 2 and perform the corresponding operation (such as amount input, transaction confirmation, etc.), but also detect whether the wiring on the light guide plate 3 is broken in real time, and trigger the preset safety protection mechanism when the wiring is detected to be broken. It is understandable that, taking financial / payment devices such as POS machines and ATMs as examples, if criminals attempt to disassemble the device using probes or other drilling tools, the dense wiring on the light guide plate 3 will inevitably break. The main circuit board 1 can detect this breakage and trigger a preset security protection mechanism, such as clearing the key, locking the device, or remotely triggering an alarm. Furthermore, it should be noted that the main circuit board 1 is the core control part of the button module, integrating a main control chip, a security chip, a storage unit, and a communication module (such as 4G / WiFi). The security chip is mainly responsible for detecting whether the wiring on the light guide plate 3 is broken and triggering the preset security protection mechanism when it is broken. It should also be noted that features such as the button circuit board 2 recognizing the user's press of each button 51 and generating corresponding electrical signals, the main circuit board 1 parsing the electrical signals from the button circuit board 2 and performing corresponding operations, and the light guide plate 3 conducting light from the light source 4, are all relatively mature technologies in the field, and therefore will not be elaborated upon in this embodiment.
[0026] As can be seen from the above, compared with the traditional solution of superimposing an anti-tamper plate on the light guide plate 3 and using the light guide plate 3 and the anti-tamper plate to realize the light guiding function and the anti-tamper function respectively, this embodiment integrates the anti-tamper function on the light guide plate 3. That is, the light guide plate 3 of this application has both the light guiding function and the anti-tamper function. Thus, there is no need to set the anti-tamper plate in the traditional solution, thereby simplifying the structure of the button module, reducing the thickness of the button module, and thus reducing the production cost and assembly difficulty of the button module.
[0027] In some embodiments, please refer to Figures 1 to 5In addition to the structure described above, the button module also includes a pad 6, which is disposed on the button circuit board 2. A light guide plate 3 is disposed on the pad 6. Multiple conductive parts 511 pass through the light guide plate 3 and the pad 6 in sequence and extend above the multiple conductive contacts 21. An annular gap (not shown) is formed between the button circuit board 2 and the light guide plate 3, surrounding the pad 6. The light source 4 is disposed on the surface of the button circuit board 2 facing the light guide plate 3 and located within the annular gap. It can be understood that the main purpose of placing the pad 6 between the light guide plate 3 and the button circuit board 2 is to increase the distance between the light guide plate 3 and the button circuit board 2, thereby forming an annular gap around the pad 6 between the light guide plate 3 and the button circuit board 2, and thus providing space for the placement of the light source 4.
[0028] In one embodiment, the light guide plate 3 has multiple first through holes 31 corresponding to multiple conductive parts 511, and the pad 6 has multiple second through holes 61 corresponding to multiple first through holes 31. After the pad 6 is placed on the button circuit board 2, multiple conductive contacts 21 on the button circuit board 2 are respectively located in multiple second through holes 61. The conductive parts 511 of multiple buttons 51 first pass through multiple first through holes 31, and then extend into multiple second through holes 61 and stop above the corresponding conductive contacts 21. It can be understood that there is a one-to-one correspondence between the multiple conductive parts 511, the multiple first through holes 31, the multiple second through holes 61 and the multiple conductive contacts 21. The purpose of opening multiple first through holes 31 on the light guide plate 3 and multiple second through holes 61 on the pad 6 is to ensure that multiple conductive parts 511 can pass through the light guide plate 3 and the pad 6 in sequence and stop above the multiple conductive contacts 21, so that the button circuit board 2 can identify the user's press on each button 51 and generate the corresponding electrical signal.
[0029] In some embodiments, please refer to Figures 1 to 5The light source 4 includes multiple light-emitting units 41 electrically connected to the main circuit board 1. Each light-emitting unit 41 can emit light to the light guide plate 3 under the control of the main circuit board 1. The multiple light-emitting units 41 are distributed along at least one side of the button circuit board 2 at intervals, and each light-emitting unit 41 distributed along the same side of the button circuit board 2 corresponds to the same side of the light guide plate 3. For example, suppose the button circuit board 2 has four sides (denoted as a, b, c, and d, with side a opposite to side b and side c opposite to side d), and the light guide plate 3 has four sides (denoted as A, B, C, and D, with side A opposite to side B and side C opposite to side D), and side a corresponds to side A, side b corresponds to side B, side c corresponds to side C, and side d corresponds to side D. Then, the distribution of multiple light-emitting units 41 on the button circuit board 2 can be as follows: all light-emitting units 41 are distributed along side a at intervals, and they all correspond to side A; or, half of the light-emitting units 41 are distributed along side a at intervals (they all correspond to side A), and the other half of the light-emitting units 41 are distributed along side b at intervals (they all correspond to side B); or... The multiple light-emitting units 41 are divided into three parts: the first part of the light-emitting units 41 are distributed along side a (corresponding to side A) at intervals; the second part of the light-emitting units 41 are distributed along side c (corresponding to side C) at intervals; and the third part of the light-emitting units 41 are distributed along side d (corresponding to side D) at intervals. Alternatively, the multiple light-emitting units 41 are divided into four parts: the first part of the light-emitting units 41 are distributed along side a (corresponding to side A) at intervals; the second part of the light-emitting units 41 are distributed along side b (corresponding to side B) at intervals; the third part of the light-emitting units 41 are distributed along side c (corresponding to side C) at intervals; and the fourth part of the light-emitting units 41 are distributed along side d (corresponding to side D) at intervals. It should be noted that this application does not impose a unique limitation on the distribution of the multiple light-emitting units 41 on the keypad circuit board 2, and those skilled in the art can design it according to actual needs.
[0030] In one embodiment, a light guide portion (not shown) is formed on each side of the light guide plate 3 corresponding to the light-emitting unit 41, extending towards the button circuit board 2. Each light-emitting unit 41 on the same side of the light guide plate 3 is aligned with the light guide portion formed on that same side. In practical applications, when the main circuit board 1 controls each light-emitting unit 41 to emit light to the light guide plate 3, the emitted light first enters the light guide portion. The light guide portion can guide as much of the incident light as possible into the light guide plate 3. The light will propagate through total internal reflection within the light guide plate 3 and will be scattered when it encounters a light guide point to disrupt the total internal reflection condition. Finally, the light guide plate 3 can uniformly illuminate the button panel 5.
[0031] In one embodiment, the light-emitting unit 41 includes a light-emitting diode (not shown). It should be noted that the light-emitting unit 41 is not limited to including only one light-emitting diode. In other embodiments, the light-emitting unit 41 may include two or more light-emitting diodes. When the light-emitting unit 41 includes multiple light-emitting diodes, the multiple light-emitting diodes can be arranged in a preset pattern. This preset pattern can be any shape commonly found in the art, such as a circle, ellipse, rectangle, triangle, trapezoid, or other polygons, etc., and can be selected according to actual needs. This embodiment does not impose a unique limitation on this. It should also be noted that the light-emitting unit 41 is not limited to light-emitting diodes. In other embodiments, any device with light-emitting function in the art can also be used, such as a quantum dot light source, laser diode, cold cathode fluorescent lamp, hot cathode fluorescent lamp, electroluminescent device, organic light-emitting diode, field emission display, etc., and can be selected according to actual needs. This embodiment does not impose a unique limitation on this.
[0032] In some embodiments, please refer to Figures 1 to 5 In addition to the structure described above, the button module also includes a button bracket 7 and a conductive component 8. The button bracket 7 is mounted on the main circuit board 1, and the button circuit board 2 is mounted on the button bracket 7. One end of the conductive component 8 is mounted on the main circuit board 1, and the other end of the conductive component 8 passes through the button bracket 7, the button circuit board 2, and the pad 6 in sequence, extending to the light guide plate 3 to electrically connect the traces on the light guide plate 3. That is, the conductive component 8 is used to achieve the electrical connection between the main circuit board 1 and the traces on the light guide plate 3. It can be understood that the button bracket 7 mainly serves as a mechanical support and protective isolation mechanism. In other words, the button bracket 7 supports the button circuit board 2, the light guide plate 3, the pad 6, and the button panel 5, while effectively preventing direct contact between the button circuit board 2 and the main circuit board 1 to prevent short circuits. Furthermore, it should be noted that the conductive component 8 can be any component commonly used in the art that has electrical connection and physical support functions, such as zebra strips, conductive foam, metal springs, anisotropic conductive adhesive, spring pin connectors, etc. The specific selection of the conductive component 8 can be determined according to actual needs, and this application does not impose a unique limitation on it.
[0033] In one embodiment, the conductive component 8 is a zebra strip. The zebra strip not only serves to electrically connect the main circuit board 1 to the traces on the light guide plate 3, but also acts as an anti-tampering device. Specifically, the zebra strip is a flexible connecting material made of conductive rubber. The zebra strip has alternating conductive and insulating layers. Under normal circumstances, the main circuit board 1 is electrically connected to the traces on the light guide plate 3 through the conductive layers in the zebra strip. However, when the light guide plate 3 or the main circuit board 1 is illegally disassembled, the zebra strip will inevitably be stretched, torn, or displaced, causing a change in the connection area between the light guide plate 3 and the zebra strip. This can affect or even interrupt the electrical connection between the main circuit board 1 and the traces on the light guide plate 3. In this case, the circuit resistance detected by the main circuit board 1 increases or the state of the traces on the light guide plate 3 cannot be detected. This detection anomaly will trigger the safety protection mechanism of the main circuit board 1.
[0034] Please see Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the electronic device. Figure 7 This is an exploded view of the electronic device. This embodiment provides an electronic device including a housing 9 and the button module described above. The housing 9 has multiple button holes 91. Multiple buttons 51 in the button module extend from the housing 9 through the button holes 91 at their ends furthest from the button panel 5, allowing the user to press the buttons 51. It should be noted that the electronic device in this embodiment can be any electronic device in the art with buttons 51 and tamper-proof requirements, such as a POS machine, ATM, smart meter, access control controller, electronic safe, etc. The specific device can be selected according to actual needs, and this embodiment does not impose a unique limitation.
[0035] The above embodiments are merely preferred implementations of this application and are not the only limitation on button modules and related electronic devices with anti-tamper functionality. Those skilled in the art can make flexible settings based on the above embodiments and actual application scenarios. It is understood that through the implementation of the above embodiments of this application, a button module is constructed using a light source 4, a light guide plate 3, a button circuit board 2, a main circuit board 1, and a button panel 5. The button circuit board 2 is disposed on the main circuit board 1 and electrically connected to it. The light guide plate 3 is disposed on the button circuit board 2, and the button panel 5 is disposed on the light guide plate 3. The button panel 5 has multiple buttons 51, and the button circuit board 2 has multiple conductive contacts 21. Each button 51 has a conductive portion 511 penetrating the button panel 5. The multiple conductive portions 511 penetrate the light guide plate 3 and extend above the multiple conductive contacts 21. The light source 4 is disposed on the button circuit board 2 and electrically connected to the main circuit board 1. The surface of the light guide plate 3 facing the button panel 5 has traces electrically connected to the main circuit board 1. In practical applications, the main circuit board 1 can control the light source 4 to emit light to the light guide plate 3. The light guide plate 3 can evenly conduct the light emitted by the light source 4 to the button panel 5 to make it emit light. The conductive part 511 can make electrical contact with the corresponding conductive contact 21 when the user presses the button 51. The button circuit board 2 can identify the user's press of each button 51 according to the electrical contact between each conductive contact 21 and the corresponding conductive part 511, and transmit the electrical signal to the main circuit board 1 after generating the corresponding electrical signal. The main circuit board 1 can not only analyze the electrical signal from the button circuit board 2 and perform the corresponding operation, but also detect whether the wiring on the light guide plate 3 is broken in real time, and trigger the preset safety protection mechanism when it is broken. Therefore, compared with the traditional solution that uses the light guide plate 3 and the anti-tamper plate to achieve the light guiding function and the anti-tamper function respectively, this application integrates the anti-tamper function into the light guide plate 3. That is, the light guide plate 3 of this application has both the light guiding function and the anti-tamper function. Thus, there is no need to set up the anti-tamper plate in the traditional solution, thereby simplifying the structure of the button module, reducing the thickness of the button module, and thus reducing the production cost and assembly difficulty of the button module.
[0036] It should be noted that the several embodiments shown above in this application are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. It should also be noted that in the textual description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements may include not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus; and, without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0037] Furthermore, those skilled in the art can implement or use this application by practicing the several embodiments shown above. Various modifications to the embodiments shown above will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments not shown without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the several embodiments shown above, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A key module with anti-disassembly function, characterized in that, The application relates to a key circuit board, a light guide plate, a light source and a key panel, wherein the key circuit board is arranged on the main circuit board and electrically connected with the main circuit board; the light guide plate is arranged on the key circuit board; the key panel is arranged on the light guide plate; a plurality of keys are arranged on the key panel; a plurality of conductive contacts are arranged on the key circuit board; a plurality of conductive parts of the keys respectively penetrate the key panel; the conductive parts penetrate the light guide plate and respectively extend above the conductive contacts; the light source is arranged on the key circuit board and electrically connected with the main circuit board; and a surface of the light guide plate facing the key panel is printed with a trace electrically connected with the main circuit board. The light source is used for emitting light to the light guide plate. The light guide plate is used for uniformly conducting the light to the key panel. The conductive parts are used for electrically contacting the conductive contacts when the keys are pressed; the key circuit board is used for identifying the pressing of each key by a user and generating a corresponding electric signal according to the electrical contact between the conductive contacts and the conductive parts; the main circuit board is used for analyzing the electric signal and performing corresponding operations, and detecting whether the trace is disconnected in real time, and triggering a preset safety protection mechanism when the trace is detected to be disconnected.
2. The key module of claim 1, wherein, The application further relates to a pad arranged on the key circuit board, the light guide plate is arranged on the pad, the conductive parts penetrate the light guide plate and the pad in sequence and respectively extend above the conductive contacts, an annular gap is formed between the key circuit board and the light guide plate and surrounds the pad, and the light source is arranged on a surface of the key circuit board facing the light guide plate and located in the annular gap.
3. The key module of claim 2, wherein, The light source comprises a plurality of light emitting units for emitting the light and electrically connected with the main circuit board, the light emitting units are distributed along at least one side of the key circuit board at intervals, and each light emitting unit distributed along the same side of the key circuit board corresponds to a same side of the light guide plate.
4. The key module of claim 3, wherein, The light guide plate is provided with a light guide part extending towards the key circuit board on each side corresponding to the light emitting unit, and the light guide part is used for guiding the light emitted by the light emitting unit into the light guide plate.
5. The key module of claim 3, wherein, The light emitting unit comprises at least one light emitting diode; when the light emitting unit comprises a plurality of light emitting diodes, the light emitting diodes are arranged in a preset pattern.
6. The key module of claim 2, wherein, The light guide plate is provided with a plurality of first through holes corresponding to the conductive parts, the pad is provided with a plurality of second through holes corresponding to the first through holes, the conductive contacts are located in the second through holes, and the conductive parts penetrate the first through holes and extend above the conductive contacts.
7. The key module of claim 2, wherein, The application further relates to a key support arranged on the main circuit board, and the key circuit board is arranged on the key support.
8. The key module of claim 7, wherein, The conductive piece is arranged on the main circuit board at one end, and extends to the light guide plate through the key support, the key circuit board and the backing plate at the other end to electrically connect the wire.
9. The key module of claim 8, wherein, The conductive piece is a zebra strip.
10. An electronic device, comprising: The key module is arranged in the shell, and a plurality of key holes are arranged on the shell.