Plane pressing membrane switch

Abstract

The utility model relates to a plane pressing membrane switch, which belongs to the technical field of membrane switches and comprises a bottom plate, a lower circuit board is fixed at the top of the bottom plate, a partition plate is fixed at the top of the lower circuit board, a metal elastic sheet is arranged at the top of the lower circuit board, an upper circuit strip is arranged above the partition plate and the metal elastic sheet, and a lower circuit strip is arranged above the partition plate and the metal elastic sheet. The top of the upper circuit strip is fixedly provided with a filling layer, the top of the filling layer is fixedly provided with a thin film layer, and the bottom of the metal elastic sheet is fixedly provided with a metal sheet. According to the plane pressing membrane switch, when the membrane layer is pressed, the upper circuit strip, the filling layer and the metal elastic sheet are extruded, so that the metal elastic sheet pushes the linkage assembly to move downwards due to elastic deformation, the telescopic rod in the linkage assembly is lifted up, the stroke of the metal elastic sheet can be effectively reduced, and when the metal elastic sheet is loosened, the upper circuit strip and the filling layer are separated from each other. Therefore, the distance between the telescopic rod and the metal elastic sheet is guaranteed, and mistaken touch is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane switches, in particular to a plane pressing membrane switch. Background Art

[0002] Membrane switch is an operating system that integrates key functions, indicating elements and instrument panels. Membrane switch has rigorous structure, beautiful appearance, good sealing, moisture resistance and long service life. It is widely used in electronic communication and electronic measurement instruments, industrial control, medical equipment, automotive industry, smart toys, household appliances and other fields.

[0003] A flat push membrane switch usually causes a metal spring to elastically dent when pressed, thereby connecting a circuit board. When the pressure is stopped, the metal spring elastically returns to its original position, thereby disconnecting the circuit. However, during the pressing process, the elastic dent travel of the metal spring is relatively large. After people press the metal spring a lot, the metal spring is very likely to have its service life reduced due to excessive elastic deformation. Therefore, a flat push membrane switch is proposed to solve the above problem. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a flat push membrane switch, which has the advantages of high durability and solves the problem that the service life of metal springs is easily reduced due to excessive elastic deformation.

[0005] To achieve the above object, the utility model provides the following technical solutions: a flat push membrane switch, comprising a bottom plate, a lower circuit board is fixed on the top of the bottom plate, a partition plate is fixed on the top of the lower circuit board, a metal spring penetrating the partition plate is arranged on the top of the lower circuit board, an upper circuit strip is arranged above the partition plate and the metal spring strip, and a filling layer is fixed on the top of the upper circuit strip;

[0006] A film layer is fixed on the top of the filling layer, a metal sheet is fixed on the bottom of the metal spring, and two linkage components are arranged between the lower circuit board and the metal spring, and the linkage components are used to reduce the moving stroke of the metal spring;

[0007] The linkage assembly includes a telescopic rod, a positioning block, a traction wheel, a connecting block, a connecting line and a reset spring. The telescopic rod is fixed to the top of the lower circuit board, the top of the lower circuit board is fixed to the positioning block, the interior of the positioning block is rotatably connected to the traction wheel, the bottom of the metal spring is fixed to the connecting block, the opposite sides of the two telescopic rods are fixed to the connecting line that bypasses the traction wheel, the side of the connecting line away from the telescopic rod is fixed to the bottom of the connecting block, and the telescopic rod and the lower circuit board are fixed to the reset spring.

[0008] Furthermore, the telescopic rod comprises an extension rod fixed to the lower circuit board, and an extension block is slidably connected to the outer surface of the extension rod.

[0009] Furthermore, a sliding block is fixed on the outer surface of the extension rod, and a sliding groove slidably connected to the sliding block is provided inside the extension block.

[0010] Furthermore, the metal sheet, the extension rod and the extension block are all conductive parts, and the positioning block, the traction wheel, the connecting block and the connecting wire are all insulating parts.

[0011] Furthermore, a surface adhesive layer is fixed on the top of the partition plate and the metal spring sheet, and the surface adhesive layer is fixed to the upper circuit strip.

[0012] Furthermore, the metal spring sheet, the upper circuit strip, the filling layer and the film layer are all "convex" shaped parts.

[0013] Furthermore, a light-transmitting hole is opened inside the filling layer, and the upper circuit strip is an LED light strip.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] The flat push membrane switch squeezes the upper circuit strip, the filling layer and the metal spring when the membrane layer is pressed, so that the metal spring pushes the linkage component downward due to elastic deformation, so that the telescopic rod inside the linkage component is lifted, which can effectively reduce the stroke of the metal spring. When the metal spring is released, the telescopic rod is extended and retracted, thereby ensuring the distance between the telescopic rod and the metal spring to prevent accidental touch. The overall structure is simple, which can effectively improve the overall service life, making the overall more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the linkage assembly of the utility model;

[0018] Figure 3 It is a three-dimensional diagram of the telescopic rod structure of the utility model.

[0019] In the figure: 1 bottom plate, 2 lower circuit board, 3 partition plate, 4 metal spring sheet, 5 upper circuit strip, 6 filling layer, 7 film layer, 8 metal sheet, 9 linkage assembly, 901 telescopic rod, 902 positioning block, 903 traction wheel, 904 connecting block, 905 connecting line, 906 return spring, 10 surface adhesive layer. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1 A flat push membrane switch in this embodiment includes a bottom plate 1, a lower circuit board 2 is fixed on the top of the bottom plate 1, and the lower circuit board 2 is a PCB circuit board. When the PCB circuit board is connected, an electrical signal is transmitted. A partition plate 3 is fixed on the top of the lower circuit board 2. The partition plate 3 is used to separate the lower circuit board 2 from the upper circuit bar 5. A metal spring 4 is arranged on the top of the lower circuit board 2 and passes through the partition plate 3. The metal spring 4 has a certain elasticity, so that after the metal spring 4 is pressed, the metal spring 4 can be reset.

[0022] In addition, an upper circuit bar 5 is provided above the partition plate 3 and the metal spring sheet 4. The upper circuit bar 5 is an LED light bar. A surface adhesive layer 10 is fixed on the top of the partition plate 3 and the metal spring sheet 4. The surface adhesive layer 10 is fixed to the upper circuit bar 5. The upper circuit bar 5 and the partition plate 3 can be fixed by the set surface adhesive layer 10, so that the whole is more stable. A filling layer 6 is fixed on the top of the upper circuit bar 5, and a light-transmitting hole is opened inside the filling layer 6.

[0023] Furthermore, a film layer 7 is fixed on the top of the filling layer 6, and a metal sheet 8 is fixed on the bottom of the metal spring sheet 4. The metal sheet 8 is used to connect the two telescopic rods 901. Two linkage components 9 are provided between the lower circuit board 2 and the metal spring sheet 4. The linkage components 9 are used to reduce the moving stroke of the metal spring sheet 4.

[0024] In this embodiment, the metal spring sheet 4, the upper circuit strip 5, the filling layer 6 and the film layer 7 are all "convex" shaped parts, which are arranged as "convex" shaped parts so that the metal spring sheet 4 can be squeezed more conveniently.

[0025] In general, the light-transmitting holes provided on the filling layer 6 allow the light of the upper circuit strip 5 to pass through the film layer 7, thereby illuminating the film layer 7, making the overall use more convenient.

[0026] See also Figure 2-3The linkage assembly 9 in this embodiment includes a telescopic rod 901, a positioning block 902, a traction wheel 903, a connecting block 904, a connecting line 905 and a reset spring 906. The telescopic rod 901 is fixed to the top of the lower circuit board 2. The two telescopic rods 901 are the two ends of the contact of the lower circuit board 2. The telescopic rod 901 includes an extension rod fixed to the lower circuit board 2. The outer surface of the extension rod is slidably connected with an extension block. The outer surface of the extension rod is fixed with a sliding block. The extension block and the sliding block are set so that the sliding of the extension block is more stable. A sliding groove slidably connected to the sliding block is opened inside the extension block. The top of the lower circuit board 2 is fixed to the positioning block 902. The interior of the positioning block 902 is rotatably connected to the traction wheel 903. The traction wheel 903 is a prior art and can limit the moving direction of the connecting line 905.

[0027] In addition, the bottom of the metal spring 4 is fixed to the connecting block 904, the opposite sides of the two telescopic rods 901 are fixed to the connecting wire 905 that bypasses the traction wheel 903, the side of the connecting wire 905 away from the telescopic rod 901 is fixed to the bottom of the connecting block 904, and the telescopic rod 901 and the lower circuit board 2 are fixed with a reset spring 906. In the figure, the reset spring 906 has been squeezed to generate a prestressed state.

[0028] In this embodiment, the metal sheet 8, the extension rod and the extension block are all conductive parts, and the positioning block 902, the traction wheel 903, the connecting block 904 and the connecting wire 905 are all insulating parts.

[0029] In general, the length of the connecting line 905 is a fixed value. When the connecting block 904 moves downward, the connecting line 905 is changed from a tensioned state to a relaxed state by the downward force, and the reset spring 906 can push the telescopic rod 901 to move upward, thereby ensuring the distance between the telescopic rod 901 and the metal sheet 8. The set metal spring sheet 4 also has a certain rigidity, so that the metal spring sheet 4 can be deformed only when there is an external force.

[0030] The electrical components appearing in the text are all electrically connected to the controller and the power supply. The control method of the utility model is controlled by the controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power supply is also common knowledge in this field. The utility model is mainly used to protect mechanical devices, so the utility model will no longer explain the control method and circuit connection in detail.

[0031] The working principle of the above embodiment is:

[0032] When the film layer 7 is pressed, the filling layer 6, the upper circuit strip 5 and the metal spring sheet 4 are squeezed, so that the metal spring sheet 4 moves downward due to elastic deformation, thereby pushing the connecting block 904 to move downward. When the connecting block 904 moves downward, the side where the connecting line 905 is fixed to the connecting block 904 is loosened, so that the end where the connecting line 905 is fixed to the telescopic rod 901 has a certain moving space, and under the push of the prestressed return spring 906, the extension block slides upward on the outer surface of the extension rod, thereby effectively By reducing the distance between the telescopic rod 901 and the metal spring 4, the travel of the metal spring 4 can be effectively reduced, so that the telescopic rod 901 is easier to contact with the metal sheet 8, and when the metal spring 4 is pressed, the prestress of the return spring 906 will push the telescopic rod 901 to move, so that the telescopic rod 901 will have a certain pulling effect on the connecting line 905 and the connecting block 904, so that when the metal spring 4 is pressed, it can be easier, the overall structure is simple, and the overall service life is effectively improved, making the overall structure more practical.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention.

Claims

1. A flat push membrane switch, comprising a bottom plate (1), characterized in that: A lower circuit board (2) is fixed on the top of the bottom plate (1), a partition plate (3) is fixed on the top of the lower circuit board (2), a metal spring (4) penetrating the partition plate (3) is provided on the top of the lower circuit board (2), an upper circuit strip (5) is provided above the partition plate (3) and the metal spring (4), and a filling layer (6) is fixed on the top of the upper circuit strip (5); A film layer (7) is fixed on the top of the filling layer (6), a metal sheet (8) is fixed on the bottom of the metal spring sheet (4), and two linkage components (9) are provided between the lower circuit board (2) and the metal spring sheet (4), and the linkage components (9) are used to reduce the movement stroke of the metal spring sheet (4); The linkage assembly (9) comprises a telescopic rod (901), a positioning block (902), a traction wheel (903), a connecting block (904), a connecting wire (905) and a reset spring (906); the telescopic rod (901) is fixed to the top of the lower circuit board (2); the top of the lower circuit board (2) is fixed to the positioning block (902); the interior of the positioning block (902) is rotatably connected to the traction wheel (903); the bottom of the metal spring sheet (4) is fixed to the connecting block (904); the opposite sides of the two telescopic rods (901) are fixed to the connecting wire (905) bypassing the traction wheel (903); the side of the connecting wire (905) away from the telescopic rod (901) is fixed to the bottom of the connecting block (904); and the telescopic rod (901) and the lower circuit board (2) are fixed to the reset spring (906).

2. The flat push membrane switch according to claim 1, characterized in that: The telescopic rod (901) comprises an extension rod fixed to the lower circuit board (2), and an extension block is slidably connected to the outer surface of the extension rod.

3. The flat push membrane switch according to claim 2, characterized in that: A sliding block is fixed on the outer surface of the extension rod, and a sliding groove slidably connected to the sliding block is provided inside the extension block.

4. The flat push membrane switch according to claim 2, characterized in that: The metal sheet (8), the extension rod and the extension block are all conductive parts, and the positioning block (902), the traction wheel (903), the connection block (904) and the connection line (905) are all insulating parts.

5. The flat push membrane switch according to claim 1, characterized in that: A surface adhesive layer (10) is fixed on the top of the partition plate (3) and the metal spring sheet (4), and the surface adhesive layer (10) is fixed to the upper circuit strip (5).

6. The flat push membrane switch according to claim 1, characterized in that: The metal spring (4), the upper circuit strip (5), the filling layer (6) and the film layer (7) are all "convex" shaped parts.

7. The flat push membrane switch according to claim 1, characterized in that: A light-transmitting hole is provided inside the filling layer (6), and the upper circuit strip (5) is an LED light strip.

Images