Key switch with display screen

Abstract

The utility model discloses a key switch with a display screen, which comprises the display screen, a switch shaft, a key seat and a main PCB (printed circuit board), the switch shaft is assembled below the display screen and can move up and down in the key seat, the key seat is arranged on the main PCB, and a plurality of conductive reset springs for resetting the switch shaft are arranged between the switch shaft and the key seat. The display screen is electrically connected with the main PCB through the conductive reset spring. According to the key switch, the conductive reset spring is adopted as an electric connection assembly, stable reset of the key is achieved, the conductive reset spring is also adopted as an electric connection element, stable electric connection between the display screen and the main PCB is achieved, and the problems of material fatigue and conductor breakage caused by long-term repeated bending of an FPC are solved. In addition, the utility model has the remarkable advantages of simple structure, convenience in assembly, long service life and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of key switch, concretely relates to a key switch with display screen. BACKGROUND

[0002] The existing key with display screen, the stroke is short such as 3mm below, the display screen is connected between the mainboard generally with FPC (flexible circuit board). However, when involving the keyboard switch of long stroke, the stroke of key switch is usually more than 3mm, and the durability of FPC becomes a big challenge. The advantage of FPC is flexibility, and it is suitable for the application needing bending, but long-term repeated bending can lead to material fatigue, especially the fracture of copper conductor.

[0003] In the case of large stroke of keyboard switch, the bending degree of FPC is greater or the bending radius is smaller when pressing the key each time. If the bending radius is small, the stress of material is greater, and the conductor is prone to breakage. In addition, if the bending times and frequency are high, the cumulative fatigue effect will be more obvious, so that FPC is difficult to meet the service life requirement of keyboard switch up to tens of millions of times. SUMMARY

[0004] In view of the above problems, the utility model aims at providing a key switch with display screen, especially suitable for long-stroke application scenarios, and aims at solving the problem of insufficient durability of FPC connection in the prior art.

[0005] To achieve the technical purpose, the utility model provides a key switch with display screen, which comprises a display screen, a switch shaft, a key seat and a main PCB board, the switch shaft is assembled below the display screen and can move up and down in the key seat, the key seat is arranged on the main PCB board, a plurality of conductive reset springs for resetting the switch shaft are arranged between the switch shaft and the key seat, and the display screen is electrically connected with the main PCB board through the conductive reset springs.

[0006] As a preferred, the bottom of the switch shaft is provided with a first adapter plate, the second adapter plate is arranged in the key seat, the main PCB board is electrically connected with the second adapter plate through the second socket, and the first adapter plate is electrically connected with the display screen through the first socket. The middle part of the conductive reset spring is an elastic part, and the elastic part of the conductive reset spring abuts between the first adapter plate and the second adapter plate. The upper and lower ends of the conductive reset spring are conductive ends, and the first adapter plate and the second adapter plate are electrically connected through the conductive ends of the conductive reset spring.

[0007] As preferred, the switch shaft, the first adapter plate and the second adapter plate are all provided with corresponding through holes for the conductive end of the conductive reset spring to pass through; the switch shaft is provided with a first avoiding hole for the first socket to pass through, and the key seat is provided with a second avoiding hole for the second socket to pass through; the upper conductive end of the conductive reset spring passes through the through hole of the first adapter plate and is fixed and electrically connected therewith, and the lower conductive end of the conductive reset spring passes through the through hole of the second adapter plate and is fixed and electrically connected therewith.

[0008] As preferred, the conductive end is provided with a hook structure which is fixedly connected with the switch shaft and the second adapter plate by bending or buckling.

[0009] As preferred, the key seat is provided with a stopper for placing and lifting the second adapter plate.

[0010] As preferred, the switch shaft is extended downwardly with a guide column, the main PCB board or the second adapter plate is provided with an electrical element, and the guide column is provided with a triggering element which can trigger the electrical element to generate an electrical signal.

[0011] As preferred, the triggering element is a grating hole on the guide column, and the second adapter plate is provided with a light tube assembly, and the grating hole is used for cooperating with the light tube assembly to trigger a photoelectric signal.

[0012] As preferred, the triggering element is a magnetic element on the guide column, and the main PCB board is provided with a Hall element, and the magnetic element is used for cooperating with the Hall element to trigger an electromagnetic signal.

[0013] As preferred, the key switch further comprises a display screen protection cover, the display screen is arranged in the display screen protection cover, and the top of the display screen protection cover is provided with a transparent display screen protection cover.

[0014] The key switch has the advantages that: the conductive reset spring is used as the electrical connection component, the stable reset of the key is realized, the conductive reset spring is used as the electrical connection element, the stable electrical connection between the display screen and the main PCB board is realized, and the material fatigue and conductor fracture of the FPC caused by long-term repeated bending are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model;

[0016] Figure 2 It is an explosion view of the utility model;

[0017] Figure 3It is the internal structure schematic view of the utility model.

[0018] Figure 4 It is the structure schematic view of the key seat in the utility model.

[0019] Figure 5 It is the structure schematic view of the switch shaft and the key seat in the utility model.

[0020] Figure 6 It is the structure schematic view of the second adapter plate and the key seat in the utility model.

[0021] Figure 7 It is the structure schematic view of the switch shaft and the first adapter plate in the utility model.

[0022] Figure 8 It is the structure schematic view of the conductive reset spring in the utility model.

[0023] Figure 9 It is the structure schematic view of the Hall element in the utility model.

[0024] Figure 10 It is the structure schematic view of the light tube assembly in the utility model

[0025] Figure 11 It is the structure schematic view of the key seat bottom in the utility model.

[0026] In the drawing: 1, protective cover; 2, display screen; 3, display screen protective cover; 4, switch shaft; 401, through hole; 402, first air clearance hole; 403, guide column; 5, first socket; 6, first adapter plate; 601, first through hole; 7, conductive reset spring; 701, elastic part; 702, conductive end; 8, second adapter plate; 801, second through hole; 9, second socket; 10, key seat; 1001, second air clearance hole; 1002, stop block; 11, main PCB board; 12, grating hole; 13, light tube assembly; 14, Hall element. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and specific embodiment. In order to clearly and completely describe the technical scheme, the following embodiment is selected to explain; the following embodiment is a part of embodiment of the utility model; other embodiments obtained based on the present application under the premise of not making creative labor all belong to the protection scope of the utility model.

[0028] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and the like orientation or positional relationships are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of clearly describing the embodiments, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application. At the same time, "first", "second" in the embodiments are only used for distinguishing description purposes, and do not represent relative importance.

[0029] As shown in Figures 1-11 The specific embodiment of the utility model discloses a key switch with display screen, including display screen 2, display screen protection cover 3, switch shaft 4, key seat 10 and main PCB board 11. Display screen 2 is assembled at the top of display screen protection cover 3, is used to show information. Switch shaft 4 is assembled below display screen 2, and can move up and down in key seat 10, and key seat 10 is set on main PCB board 11, is used to fix and support the structure of entire key switch.

[0030] Between switch shaft 4 and key seat 10, a group of conductive reset springs 7 are arranged in the key switch, and display screen 2 is electrically connected to main PCB board 11 through conductive reset spring 7. In the application, preferably, 8 conductive reset springs 7 are used to ensure the stability and reliability of the connection and reduce electrical faults caused by poor connection. The middle part of conductive reset spring 7 is an elastic part 701 for resetting switch shaft 4 after pressing, and the upper and lower ends are conductive ends 702 for realizing electrical connection. The arrangement of conductive reset spring 7 not only solves the problem of key reset, but also avoids the bending fatigue problem of traditional FPC connection.

[0031] The bottom of switch shaft 4 is provided with a first adapter plate 6, and the key seat 10 is provided with a second adapter plate 8. The main PCB board 11 is electrically connected to the second adapter plate 8 through a second socket 9, and the first adapter plate 6 is electrically connected to the display screen 2 through a first socket 5. The elastic part 701 of the conductive reset spring 7 abuts between the first adapter plate 6 and the second adapter plate 8, so that the first adapter plate 6 and the second adapter plate 8 are electrically connected through the conductive end 702 of the conductive reset spring 7.

[0032] As shown in Figures 4-7 The switch shaft 4, the first adapter plate 6 and the second adapter plate 8 are all provided with corresponding through holes 401, 601 and 801 for the conductive end 702 of the conductive reset spring 7 to pass through. In addition, the switch shaft 4 is provided with a first avoidance hole 402 through which the first socket 5 can pass, and the key seat 10 is provided with a second avoidance hole 1001 through which the second socket 9 can pass. These arrangements ensure the correct alignment and stable connection between the components.

[0033] The upper conductive end 702 of the conductive reset spring 7 passes through the first through hole 601 of the first adapter plate 6 and is fixed and electrically connected with the first adapter plate 6, since the top of the switch shaft 4 is close to the first adapter plate 6, the switch shaft 4 is also provided with a corresponding through hole 401, and the through hole 401 is larger than the first through hole 601, so as to facilitate the electrical connection between the conductive end 702 and the first adapter plate 6. The lower conductive end 702 passes through the second through hole 801 of the second adapter plate 8 and is fixed and electrically connected with the second adapter plate 8. In order to realize stable fixed connection, the conductive end 702 is provided with a hook-shaped structure, and the hook-shaped structure firmly connects the conductive reset spring 7 on the first adapter plate 6 and the second adapter plate 8 by bending or buckling.

[0034] As shown in Figure 6 The key seat 10 is also provided with a stopper 1002 for placing and lifting the second adapter plate 8. The arrangement of the stopper 1002 ensures the correct alignment between the second adapter plate 8 and the main PCB plate 11 and the second socket 9.

[0035] The switch shaft 4 extends downwardly and is provided with a guide column 403, and the guide column 403 is provided with a trigger element. The main PCB plate 11 is provided with a corresponding electrical element. The trigger element can be a grating hole 12 on the guide column 403, which cooperates with a light pair tube assembly 13 arranged by a patch on the second adapter plate 8 to trigger an optical signal; or the trigger element can be a magnetic element, which cooperates with a Hall element 14 arranged by a patch on the main PCB plate 11 to trigger an electromagnetic signal. The trigger element can trigger the electrical element to generate an electrical signal, thereby realizing the function of the key switch.

[0036] In order to improve the durability and safety of the key switch, a transparent protective cover 1 is arranged on the top of the display screen protection cover 3. The protective cover 1 can effectively prevent the display screen 2 from being damaged by the outside world.

[0037] When the protective cover 1 is pressed, the switch shaft 4 drives the first adapter plate 6 to move downwardly, and the conductive reset spring 7 is compressed. At this time, the upper and lower ends of the conductive reset spring 7 are in electrical contact with the first adapter plate 6 and the second adapter plate 8 respectively, thereby ensuring the electrical signal transmission between the display screen 2 and the main PCB plate 11. At the same time, the trigger element on the guide column 403 below the switch shaft 4 cooperates with the electrical element on the main PCB plate 11 to generate an electrical signal. When the display screen protection cover 3 is released, the elastic part 701 of the conductive reset spring 7 restores to the original shape and pushes the switch shaft 4 and the first adapter plate 6 to reset.

[0038] In summary, the key switch with the display screen 2 of the utility model adopts the conductive reset spring 7 as the electrical connection and reset element, which not only realizes the stable reset of the key and the electrical signal transmission, but also avoids the bending fatigue problem of the traditional FPC connection. At the same time, the utility model also has the advantages of simple structure, convenient assembly, low cost and long service life.

[0039] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any slight modification, equivalent replacement and improvement of the above embodiment according to the technical essence of the present application shall be included in the protection scope of the technical scheme of the present application.

Claims

1. A key switch with a display screen, comprising a display screen (2), a switch shaft (4), a key seat (10) and a main PCB (11), the switch shaft (4) is assembled below the display screen (2) and can move up and down in the key seat (10), the key seat (10) is arranged on the main PCB (11), characterized in that: A plurality of conductive reset springs (7) for resetting the switch shaft are arranged between the switch shaft (4) and the key seat (10), and the display screen (2) is electrically connected with the main PCB (11) through the conductive reset spring (7).

2. The key switch with display according to claim 1, characterized in that The bottom of the switch shaft (4) is provided with a first adapter plate (6), the key seat (10) is provided with a second adapter plate (8), the main PCB (11) is electrically connected with the second adapter plate (8) through a second socket (9), the first adapter plate (6) is electrically connected with the display screen (2) through a first socket (5), the middle part of the conductive reset spring (7) is an elastic part (701), the elastic part (701) of the conductive reset spring (7) is abutted between the first adapter plate (6) and the second adapter plate (8), and the upper and lower ends of the conductive reset spring (7) are conductive ends (702).

3. The key switch with display according to claim 2, characterized in that: The switch shaft (4), the first adapter plate (6) and the second adapter plate (8) are all provided with corresponding through holes for the conductive ends (702) of the conductive reset spring (7) to pass through, the switch shaft (4) is provided with a first avoiding hole (402) for the first socket (5) to pass through, the key seat (10) is provided with a second avoiding hole (1001) for the second socket (9) to pass through, the upper conductive end (702) of the conductive reset spring (7) passes through and is fixedly and electrically connected with the first through hole (601) of the first adapter plate (6), and the lower conductive end (702) of the conductive reset spring (7) passes through and is fixedly and electrically connected with the second through hole (801) of the second adapter plate (8).

4. The key switch with display according to claim 3, characterized in that: The conductive end (702) is provided with a hook structure, the hook structure is fixedly connected between the switch shaft (4) and the second adapter plate (8) in a bending or buckling mode.

5. The key switch with display according to claim 4, characterized in that: The key seat (10) is provided with a stop block (1002) for placing and lifting the second adapter plate (8).

6. The key switch with display according to claim 5, characterized in that: A guide column (403) extends below the switch shaft (4), the main PCB (11) or the second adapter plate (8) is provided with an electrical element, the guide column (403) is provided with a triggering element, and the triggering element can trigger the electrical element to generate an electrical signal.

7. The key switch with display according to claim 6, characterized in that: The triggering element is a grating hole (12) on the guide column (403), the second adapter plate (8) is provided with a light tube assembly (13), and the grating hole (12) is used for cooperating with the light tube assembly (13) to trigger a photoelectric signal.

8. The key switch with display according to claim 6, characterized in that: The triggering element is a magnetic element on the guide column (403), the main PCB (11) is provided with a Hall element (14), and the magnetic element is used for cooperating with the Hall element (14) to trigger an electromagnetic signal.

9. The key switch with display according to any one of claims 1 to 8, characterized in that: The key switch further comprises a display screen protection cover (3), the display screen (2) is arranged in the display screen protection cover (3), and the top of the display screen protection cover (3) is provided with a transparent display screen protection cover (1).

Images