Stable key structure

Abstract

Disclosed in the present invention is a stable key structure, comprising an independent T-shaped actuation stem, the actuation stem being composed of a stem top and a stem body, and the actuation stem contacting a center position of a bottom portion of a pressing head by means of the stem top of the actuation stem. A guide cavity is disposed on a key seat, and the stem body can be assembled in the guide cavity in a vertically movable manner. A return spring is sleeved outside the stem body, one end of the return spring contacting the key seat and the other end thereof contacting a bottom portion of the stem top. The pressing head is pressed down to drive the actuation stem to move downward against tension of the return spring, to thereby trigger an electronic component to generate a signal. The present invention, by means of a uniquely designed actuation stem, triggers an electronic component to generate a signal, causing the electronic component to be independent of the pressing head, which is prone to generating shaking when being pressed, and contacts the center position of the bottom portion of the pressing head to form a point contact, such that only downward pressure can be centralized to the actuation stem during unstable pressing of the pressing head, thereby greatly reducing and resisting the impact of shaking of the pressing head on the actuation stem, and causing an output signal to have high accuracy and stability.

Description

Stable key structure TECHNICAL FIELD

[0001] The present application relates to the field of switch, in particular to a stable key structure. BACKGROUND

[0002] Key switch as a commonly used switch is widely used, the user through the press switch shaft (also known as press head) down, trigger electronic element (may be metal sheet, pressure sensor, light pair tube, hall element, etc.) to produce corresponding switch signal, release hand when press head is up under the action of reset spring.

[0003] The traditional key is directly triggered by the press head to produce signal in the structure design, but because the press head is pressed, the press position of the user's finger is different, which is easy to cause the shaking of the press head, and the shaking will cause the signal produced by the electronic element to be unstable and inaccurate. For high performance key switch, it is a difficult technical obstacle to overcome. If only blindly improve the processing precision of the mechanical structure of the key to reduce the shaking, the cost is too high and the effect of reducing the shaking is very limited.

[0004] The motivation of the present application is to reduce the shaking problem of the key switch as much as possible with low cost by reconfiguring the structure of the key. SUMMARY

[0005] In view of the above problems, the present application aims to provide a stable key structure which can effectively reduce the shaking.

[0006] To achieve the technical purpose, the scheme of the present application is: a stable key structure for triggering electronic element to produce signal, comprising a key seat, a reset spring, and a press head capable of moving up and down in the key seat, further comprising a separate T-shaped trigger shaft, the trigger shaft is composed of a shaft top and a shaft body, the trigger shaft abuts against the bottom center position of the press head with the shaft top; a guide cavity is arranged on the key seat, and the shaft body is movably assembled in the guide cavity; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key seat, and the other end abuts against the bottom of the shaft top; driving the trigger shaft to overcome the tension of the reset spring to go down and trigger the electronic element to produce signal by pressing the press head.

[0007] Preferably, the surface of the shaft top is arc surface structure, and the shaft top and the bottom of the press head are in point contact.

[0008] Preferably, the electronic element is a light pair tube assembly composed of a light emitting element and a light sensitive element, and the up and down movement of the shaft body can affect the change of the light flux of the light sensitive element from the light emitting element to produce signal.

[0009] As preferred, the guide cavity is provided with a through hole, and the photosensitive element can receive the light emitted by the light emitting element through the through hole; the shaft body is provided with a light transmission hole; when the light transmission hole of the shaft body moves to the position of the through hole of the guide cavity, the photosensitive element receives the light from the light emitting element.

[0010] As preferred, the shaft body is a hollow structure, and a light barrier piece made of a lightproof material is inserted into the hollow structure of the shaft body, and the light barrier piece is provided with a light transmission tapered long hole.

[0011] As preferred, the light barrier piece is provided with wedge-shaped elastic ends at two ends.

[0012] As preferred, the bottom of the shaft top is further provided with a spring fixing column, and the top end of the return spring is sleeved on the spring fixing column.

[0013] As preferred, the two sides of the pressing head are respectively extended with a pair of limiting hooks, the key seat is provided with hook grooves at positions corresponding to the limiting hooks, and the limiting hooks are stopped by the hook grooves when the pressing head is reset and cannot continue to go up.

[0014] As preferred, the inner corners of the key seat are respectively provided with guide grooves, and the outer corners of the pressing head are matched with the guide grooves.

[0015] The present application has the advantages that: the present application triggers the electronic element to generate a signal through the trigger shaft designed in a unique way, so that the trigger shaft is independent of the pressing head which is easy to shake when pressed, and is abutted at the bottom center position of the pressing head to form a point contact, so that the unstable pressing of the pressing head can only concentrate the downward pressure on the trigger shaft, the influence of the shaking of the pressing head on the trigger shaft is greatly reduced and eliminated, and the stable up-down movement of the trigger shaft is ensured as much as possible through the guide cavity and other structures, the influence of the shaking of the key is reduced, and the output signal has higher accuracy and stability. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is an exploded view of the present application;

[0017] Fig. 2 is a side view of the pressing head in the present application;

[0018] Fig. 3 is a structure schematic view of the grating shaft and the grating piece in the present application;

[0019] Fig. 4 is a structure schematic view of the grating shaft and the grating piece in the present application;

[0020] Fig. 5 is a structure schematic view of the key seat in the present application;

[0021] Fig. 6 is a sectional view of the key seat in the present application;

[0022] Fig. 7 is a sectional view of the pressing head when it is not pressed in the present application;

[0023] Fig. 8 is a sectional view of the pressing head being pressed in the present application.

[0024] In the figure: 1, pressing head; 101, limiting hook; 2, trigger shaft; 201, shaft top; 202, spring fixing column; 203, shaft body; 204, light transmission hole; 3, return spring; 4, key seat; 401, guide cavity; 402, through hole; 403, upper part of guide table; 404, lower part of guide table; 405, hook groove; 406, guide groove; 5, grating piece; 501, wedge-shaped elastic end; 502, conical long hole. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in conjunction with the drawings and specific embodiments. In order to clearly and completely describe the technical solutions, the following embodiments are selected for description; the following embodiments are part of the embodiments of the present application; based on the present application, other embodiments obtained without making creative efforts all fall within the scope of protection of the present application.

[0026] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and the like orientation or position relationship are all based on the orientation or position relationship shown in the drawings, and are only for the convenience of clearly describing the embodiments, and do not indicate or imply that the devices or elements referred to must have a particular orientation, so it 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.

[0027] As shown in Figs. 1-8, the stable key structure involved in the present application is used to trigger electronic elements to generate signals, which comprises a key seat 4, a return spring 3, and a pressing head 1 capable of moving up and down in the key seat 4.

[0028] The core point of the present application is to design a T-shaped trigger shaft 2 independent of the pressing head 1, which triggers electronic elements to generate switching signals through the trigger shaft 2, rather than directly through the pressing head as in the traditional structure. The purpose of this is to effectively block and reduce the influence of the shaking of the pressing head 1 on the trigger electronic elements.

[0029] The trigger shaft 2 is composed of a shaft top 201 and a shaft body 203, and the trigger shaft 2 abuts against the bottom center position of the pressing head 1 with its shaft top 201. Such a connection structure makes the shaking of the pressing head brought by the user pressing at an uncertain position (such as any edge of the keycap / pressing head) not be transmitted to the trigger shaft 2, and maximally ensures that the pressing of the pressing head 1 can only transmit the downward pressure to the trigger shaft 2.

[0030] In addition, in order to further ensure smooth and stable up-down movement of the trigger shaft 2, a guide cavity 401 is arranged on the key seat 4, and the shaft body 203 is movably arranged in the guide cavity 401, so as to ensure that the shaft body 203 keeps linear movement during movement.

[0031] The reset spring 3 in the scheme is sleeved on the shaft body 203, one end of the reset spring 3 abuts against the key seat 4, and the other end abuts against the bottom of the shaft top 201; the press head 1 is pressed downward to drive the trigger shaft 2 to overcome the tension of the reset spring 3 and move downward to trigger the electronic element to generate a signal. The shaft top 201 of the trigger shaft 2 abuts against the press head 1, and the force applied by the user on the press head 1 is transmitted to the shaft body 203, so as to trigger the electronic element to generate a signal. By separating the trigger shaft 2 of the trigger structure from the press head 1 and further stably configuring the movement of the trigger shaft 2, the influence of the trigger shaft 2 caused by the shaking of the press head 1 is effectively reduced, and the output signal has higher accuracy and stability.

[0032] In the scheme, the surface of the shaft top 201 is an arc surface structure, and the shaft top 201 and the bottom of the press head 1 are in point contact, so that the unstable pressing of the press head 1 can only transmit the downward pressure to the trigger shaft 2, and the influence of the trigger shaft 2 caused by the shaking of the press head 1 is maximally reduced and eliminated.

[0033] The scheme provides an optical key, wherein the electronic element is a light pair tube assembly composed of a light emitting element and a light sensitive element, and the up-down movement of the shaft body 203 can affect the change of the light flux received by the light sensitive element from the light emitting element, so as to generate a signal. When the key is pressed, the shaft body 203 moves downward to block or change the light path between the light emitting element and the light sensitive element, so as to change the light flux received by the light sensitive element.

[0034] In the scheme, the guide cavity 401 is provided with a through hole 402, the light sensitive element can receive the light emitted by the light emitting element through the through hole 402, and the shaft body 203 is provided with a light transmission hole 204. When the light transmission hole 204 of the shaft body moves to the position of the through hole 402 of the guide cavity, the light sensitive element receives the light from the light emitting element.

[0035] Further, in order to more accurately adjust the key signal output, the scheme of the present application further provides a grating piece 5, the shaft body 203 is a hollow structure, the grating piece 5 is inserted into the hollow structure of the shaft body 203, the grating piece 5 is a non-light-transmitting material, and a light-transmitting tapered long hole 502 is formed on the grating piece 5. When the shaft body 203 moves, the grating piece 5 also moves, so that when the tapered long hole 502 moves through the through hole 402 of the guide cavity, the opening area of the through hole 402 corresponding to the light path also changes, so that the light flux received by the photosensitive element from the light emitting element changes, and more accurate signal feedback is obtained.

[0036] The grating piece of the present application is not limited to a tapered long hole, and the grating piece can also regularly arrange light-transmitting and non-light-transmitting parts. These parts will block or allow light to pass through as the grating piece moves, thereby achieving different light flux control effects.

[0037] As a specific embodiment of the present application, the two ends of the grating piece 5 are provided with wedge-shaped elastic ends 501, which facilitate the expansion of the grating piece 5 after being inserted into the shaft body 203, so that the grating piece 5 can be firmly inserted into the shaft body 203.

[0038] As a specific embodiment of the present application, a guide table is arranged at the bottom of the key seat 4, the guide cavity 401 is located at the center hollow position of the guide table, the guide table is composed of an upper part and a lower part, and the cross section of the guide table is preferably a "convex" structure. The reset spring 3 is sleeved on the upper part 403 of the guide table and abuts against the lower part 404 of the guide table. The arrangement of the guide table is beneficial to reducing the length of the reset spring 3, so that it is more suitable for the key structure, thereby ensuring the stability of the key operation.

[0039] Further, in order to facilitate assembly, the spring fixing column 202 is further arranged at the bottom of the shaft top 201 for fixing the top end of the reset spring 3, and the top end of the reset spring 3 is sleeved on the spring fixing column 202. The top end of the reset spring 3 is sleeved on the spring fixing column 202, and the bottom end is sleeved on the upper part 403 of the guide table.

[0040] In order to limit the pressing head 1, a pair of limiting hooks 101 are respectively extended on both sides of the pressing head 1, and hook grooves 405 corresponding to the limiting hooks 101 are arranged in the key seat 4. When the pressing head 1 is reset, the limiting hooks 101 are stopped by the hook grooves 405 and cannot continue to move upward, thereby avoiding the problem of over-elasticity of the key.

[0041] Further, in order to make the pressing head 1 move stably and smoothly, guide grooves 406 are respectively arranged on the inner corners of the key seat 4, the outer corners of the pressing head 1 are matched with the guide grooves 406, forming a stable sliding system, and further improving the stability of the up-and-down movement of the pressing head 1.

[0042] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application, and any slight modification, equivalent replacement and improvement made to the above embodiments 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 stable button structure for triggering electronic components to generate signals, comprising a key base, a return spring, and a pressing head capable of moving up and down within the key base, characterized in that, The trigger shaft is composed of a shaft top and a shaft body, and the shaft top is in contact with the bottom center of the pressing head; a guide cavity is arranged on the key seat, and the shaft body is movably arranged in the guide cavity; a reset spring is arranged outside the shaft body, one end of the reset spring is in contact with the key seat, and the other end is in contact with the bottom of the shaft top; the pressing head is pressed to drive the trigger shaft to move downward to trigger the electronic element to generate a signal.

2. The stable key structure of claim 1, wherein: The surface of the shaft top is arc-shaped, and the shaft top is in point contact with the bottom of the pressing head.

3. The stable key structure of claim 2, wherein: The electronic element is a light-sensitive element composed of a light-emitting element and a light-sensitive element, and the up-and-down movement of the shaft body can change the light flux of the light-sensitive element from the light-emitting element to generate a signal.

4. The stable key structure of claim 3, wherein: A through hole is arranged on the guide cavity, and the light-sensitive element can receive the light emitted by the light-emitting element through the through hole; a light-transmitting hole is arranged on the shaft body; when the light-transmitting hole of the shaft body moves to the position of the through hole of the guide cavity, the light-sensitive element receives the light from the light-emitting element.

5. The stable key structure of claim 4, wherein: The shaft body is a hollow structure, and a grating sheet made of a non-transparent material is inserted into the hollow structure of the shaft body; a light-transmitting tapered long hole is arranged on the grating sheet.

6. The stable key structure of claim 5, wherein: The two ends of the grating sheet are provided with wedge-shaped elastic ends.

7. The stable key structure according to any one of claims 2-6, wherein: The bottom of the shaft top is also provided with a spring fixing column, and the top end of the reset spring is sleeved on the spring fixing column.

8. The stable key structure according to any one of claims 2-6, wherein: A pair of limiting hooks is arranged on the two sides of the pressing head, and a hook groove is arranged on the key seat corresponding to the position of the limiting hook; when the pressing head is reset, the limiting hook is stopped by the hook groove and cannot continue to move upward.

9. The stable key structure according to any one of claims 2-6, wherein: The inner corners of the key seat are respectively provided with guide grooves, and the outer corners of the pressing head are matched with the guide grooves.

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