Key assembly applied to PCB (Printed Circuit Board)

Abstract

The utility model relates to the technical field of touch keys, in particular to a key assembly applied to a PCB (Printed Circuit Board), which comprises keys and a key frame matched with the keys, the keys comprise connecting bodies and touch bodies, the key frame comprises a frame body and limiting holes, the frame body is matched with the PCB, and the limiting holes are formed in the frame body. The limiting hole is formed in the position, corresponding to a key bonding pad on the PCB, of the frame body, the connecting body is arranged on the lower side face of the touch body, the touch body is fixedly arranged in the limiting hole, and the end, away from the touch body, of the connecting body penetrates through the frame body and then makes contact with the key bonding pad on the PCB. And the product assembly efficiency and the product maintenance efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of touch buttons, and specifically relates to a button assembly applied to a PCB circuit board. Background Art

[0002] There is an inductive capacitance between any two conductive objects. A button, that is, a pad and a ground terminal can form an inductive capacitance. When the surrounding environment remains unchanged, the inductive capacitance value is a fixed and small value. When a human finger approaches the touch button, an inductive capacitance is formed between the human finger and the ground terminal. The inductive capacitance formed by the parallel pad and the ground terminal will increase the total inductive capacitance value. After detecting that the inductive capacitance value of a certain button has changed, the capacitive touch button IC will output a confirmation signal that a certain button has been pressed. Because capacitive touch buttons have no mechanical structure, all detections are small changes in electricity, so they are more sensitive to various interferences. Therefore, the design of touch buttons, the design of touch panels, and the selection of touch ICs are all very critical. Traditional touch buttons are to set a key pad on the PCB circuit board, and then one end of the touch button is welded on the key pad. When maintenance is required or during product assembly, the button is fixed to the PCB board, so the production process is cumbersome. When the circuit is damaged and needs maintenance, it is necessary to heat the solder between the PCB board and the button to disconnect it, which can easily cause maintenance failure or overheating damage to the PCB board. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a key assembly applied to a PCB circuit board.

[0004] To achieve the above object, the utility model provides the following technical solution: a key assembly applied to a PCB circuit board, comprising a key and a key frame matching the key, wherein the key comprises a connecting body and a touch body, and the key frame comprises a frame body and a limiting hole,

[0005] The frame is arranged in cooperation with the PCB circuit board, the limiting hole is arranged on the frame corresponding to the key pad on the PCB circuit board, the connecting body is arranged on the lower side of the touch body, the touch body is fixedly placed in the limiting hole, and one end of the connecting body away from the touch body passes through the frame and contacts the key pad on the PCB circuit board.

[0006] In some embodiments, the limiting hole is a stepped slot hole, and the hole diameter at the end close to the PCB circuit board is smaller. The touch body is located in the slot hole at the larger end of the limiting hole. A through hole is provided on the frame at the stepped slot hole corresponding to the limiting hole, and the connector contacts the button pad on the PCB circuit board through the through hole.

[0007] In some embodiments, the touch body is arranged on one end of the connector, and the cross-section of the connector is larger than the cross-section of the touch body. The end of the connector away from the touch body is used to contact the key pad on the PCB circuit board. The touch body includes a spring part and a touch part. One end of the spring part is connected to the upper part of the connector, and the other end of the spring part is connected to the touch part.

[0008] The frame is arranged in cooperation with the PCB circuit board, the limiting hole is arranged on the frame corresponding to the key pad on the PCB circuit board, the key is matched and arranged in the limiting hole, the limiting hole is a stepped slot hole, and the hole diameter of the end close to the PCB circuit board is larger, the touch body is located in the slot hole at the smaller end of the limiting hole, and the connecting body is located in the slot hole at the larger end of the limiting hole.

[0009] In some embodiments, two limit blocks are symmetrically arranged on the side of the connector, and two limit plates are arranged in parallel at the large end of the limit hole on the frame, and the distance between the two limit plates matches the width of the limit blocks.

[0010] In some of the embodiments, one or more limiting protrusions are circumferentially arranged on the side surface of the connector, and a limiting groove matching the limiting protrusions is arranged on the side surface of the large end hole of the limiting hole.

[0011] In some embodiments, the hole height at the small end of the limiting hole is consistent with or smaller than the height of the touch body.

[0012] In some embodiments, the touch body is provided with a central through hole.

[0013] In some embodiments, the connecting body and the touch body are integrally injection molded.

[0014] In some embodiments, the key is made of conductive plastic or conductive resin material.

[0015] Compared with the prior art, the beneficial effect of the utility model is that through the cooperation of the key frame and the key, the key pressing limit is set on the PCB circuit board, which reduces the key welding process and improves the product assembly efficiency and the product later maintenance efficiency.

[0016] Details of one or more embodiments of the present application are presented in the following drawings and descriptions to make other features, purposes and advantages of the present application more concise and easy to understand. The present application is fully described and understood through the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2The structure of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the key structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the key frame structure of the utility model;

[0021] Figure 5 This is a cross-sectional view of the button of the utility model being arranged in a limited hole;

[0022] Figure 6 Match the cross-sectional view for the buttons, button frames, and PCB circuit boards;

[0023] Figure 7 Another embodiment structure diagram Figure 1 ;

[0024] Figure 8 for Figure 7 Schematic diagram of the embodiment structure Figure 2 ;

[0025] Fig. 9 for Figure 7 A cross-sectional view of an embodiment of the present invention.

[0026] In the figure: 1. connector; 2. touch body; 3. frame; 4. limit hole; 5. PCB circuit board; 6. key pad; 7. spring part; 8. touch part; 9. limit block; 10. limit plate; 11. through hole. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-9 The utility model provides a technical solution: a key component applied to a PCB circuit board, comprising a key and a key frame matching the key, wherein the key comprises a connector and a touch body, and the key frame comprises a frame body and a limit hole,

[0029] The frame is arranged in cooperation with the PCB circuit board, the limiting hole is arranged on the frame corresponding to the key pad on the PCB circuit board, the connecting body is arranged on the lower side of the touch body, the touch body is fixedly placed in the limiting hole, and one end of the connecting body away from the touch body passes through the frame and contacts the key pad on the PCB circuit board.

[0030] Through the design of the button frame and the button, the button is pressed against the pad of the PCB to achieve contact. Due to the characteristics of the touch button, it only requires a very small gap or point connection to realize the sensing of the electrical signal of the touch sensor, thereby realizing the corresponding function of the touch button.

[0031] The key structure of the present application can facilitate assembly and coordination of the keys as well as subsequent repair and maintenance.

[0032] like Figure 7-9 As shown, the limiting hole is a stepped slot hole, and the hole diameter of the end close to the PCB circuit board is smaller. The touch body is located in the slot hole at the larger end of the limiting hole. A through hole is provided at the stepped slot hole corresponding to the limiting hole on the frame, and the connector contacts the key pad on the PCB circuit board through the through hole.

[0033] The touch body and the limiting hole are installed in the limiting hole by using interference fit, or the touch body can be bonded to the limiting hole by using an adhesive to achieve fixation between the touch body and the limiting hole.

[0034] After the touch body is fixedly matched with the limiting hole, the connector on the lower side of the touch body contacts with the corresponding pad on the PCB through the through hole to achieve mutual connection.

[0035] like Figure 1-6 As shown, the touch body is arranged on one end of the connector, and the cross section of the connector is larger than the cross section of the touch body. The end of the connector away from the touch body is used to contact the key pad on the PCB circuit board. The touch body includes a spring part and a touch part. One end of the spring part is connected to the upper part of the connector, and the other end of the spring part is connected to the touch part.

[0036] The frame is arranged in cooperation with the PCB circuit board, the limiting hole is arranged on the frame corresponding to the key pad on the PCB circuit board, the key is matched and arranged in the limiting hole, the limiting hole is a stepped slot hole, and the hole diameter of the end close to the PCB circuit board is larger, the touch body is located in the slot hole at the smaller end of the limiting hole, and the connecting body is located in the slot hole at the larger end of the limiting hole.

[0037] When assembling the components, place the button in the limiting hole, then fix the button frame to the PCB circuit board, press the connector with the large end of the limiting hole so that the end of the connector is crimped onto the button pad to achieve the matching between the button and the PCB circuit board.

[0038] In order to prevent the button from rotating on the PCB, two limit blocks are symmetrically arranged on the side of the connector, and two limit plates are arranged in parallel at the large end of the limit hole on the frame, and the spacing between the two limit plates matches the width of the limit block, so as to limit the rotation of the button.

[0039] Based on the above technical solution, in order to prevent the button from rotating, one or more limiting protrusions are circumferentially arranged on the side of the connector, and a limiting groove matching the limiting protrusion is arranged on the side of the large end hole of the limiting hole.

[0040] In order to improve the trigger sensitivity, the hole height at the small end hole of the limiting hole is consistent with the height of the touch body or is smaller than the height of the touch body.

[0041] The touch body is provided with a central through hole. Through the provision of the through hole, an indicator light can be provided on the key. When there is a touch operation, the flashing of the indicator light can serve as a prompt. Meanwhile, the hollow design also saves the manufacturing material cost.

[0042] The connecting body and the touch body are integrally injection-molded.

[0043] The key is made of conductive plastic or conductive resin material.

[0044] 1. Touch buttons made of resin materials can be formed by traditional processes such as injection molding. Compared with cylindrical springs, the material cost is lower and the production efficiency is higher;

[0045] 2. The touch buttons made of resin material have stable size and good hardness, which is convenient for automatic mechanical installation. Compared with the soft spring, manual welding is adopted for production, which significantly improves the production efficiency.

[0046] 3. The buttons made of resin material are flexible and diverse, and can adapt to different installation requirements.

[0047] Through the technical solution, a novel touch key structure is crimped onto a PCB circuit board through a connector and is pressed and limited by a key frame, thereby reducing installation requirements.

[0048] At the same time, the buttons are directly attached to the PCB circuit board, which increases the application field of the buttons.

[0049] In actual use, the connector part of the button can also be connected to the pad on the PCB board by hot riveting.

[0050] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A key assembly applied to a PCB circuit board, characterized in that: It includes a key and a key frame matching the key, the key includes a connecting body and a touch body, the key frame includes a frame body and a limiting hole, The frame is arranged in cooperation with the PCB circuit board, the limiting hole is arranged on the frame corresponding to the key pad on the PCB circuit board, the connecting body is arranged on the lower side of the touch body, the touch body is fixedly placed in the limiting hole, and one end of the connecting body away from the touch body passes through the frame and contacts the key pad on the PCB circuit board.

2. The key assembly applied to a PCB circuit board according to claim 1, characterized in that: The limiting hole is a stepped slot hole, and the hole diameter of the end close to the PCB circuit board is smaller. The touch body is located in the slot hole at the larger end of the limiting hole. A through hole is provided on the frame at the stepped slot hole corresponding to the limiting hole, and the connector contacts the key pad on the PCB circuit board through the through hole.

3. The key assembly applied to a PCB circuit board according to claim 1, characterized in that: The touch body is arranged on one end of the connector, and the cross section of the connector is larger than the cross section of the touch body. The end of the connector away from the touch body is used to contact the key pad on the PCB circuit board. The touch body includes a spring part and a touch part. One end of the spring part is connected to the upper part of the connector, and the other end of the spring part is connected to the touch part. The button matching is set in the limiting hole, and the limiting hole is a stepped slot hole setting. The hole diameter at the end close to the PCB circuit board is larger, the touch body is located in the smaller slot hole at the limiting hole, and the connector is located in the larger slot hole at the limiting hole.

4. The key assembly applied to a PCB circuit board according to claim 3, characterized in that: Two limiting blocks are symmetrically arranged on the side of the connector, and two limiting plates are arranged in parallel at the large end of the limiting hole on the frame, and the spacing between the two limiting plates matches the width of the limiting blocks.

5. The key assembly applied to a PCB circuit board according to claim 3, characterized in that: One or more limiting protrusions are circumferentially arranged on the side surface of the connector, and a limiting groove matching the limiting protrusions is arranged on the side surface of the large end hole of the limiting hole.

6. The key assembly applied to a PCB circuit board according to claim 3, characterized in that: The hole height at the small end of the limiting hole is consistent with or smaller than the height of the touch body.

7. The key assembly applied to a PCB circuit board according to claim 1, characterized in that: The touch body is provided with a central through hole.

8. The key assembly applied to a PCB circuit board according to claim 1, characterized in that: The connecting body and the touch body are integrally injection-molded.

9. The key assembly applied to a PCB circuit board according to claim 8, characterized in that: The key is made of conductive plastic or conductive resin material.

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