WO2021007969A1

WO2021007969A1 - Short stroke button switch

Info

Publication number: WO2021007969A1
Application number: PCT/CN2019/111607
Authority: WO
Inventors: 刘宁; 黎振东
Original assignee: 东莞璟阳电子科技有限公司
Priority date: 2019-07-18
Filing date: 2019-10-17
Publication date: 2021-01-21
Also published as: CN110223869A

Abstract

A short stroke button switch, comprising a base (1). A recess (101) is manufactured on the base. An upper cap (2) snap-fitted to the base is provided on the base. The upper cap closes the recess and constitutes an accommodating space for accommodating and embedding a central shaft (3) and an electromagnetic assembly (4). The electromagnetic assembly comprises an iron core (5) and a coil (6) provided coaxially, the iron core being fixedly provided within the recess of the base and the coil being embedded within a mounting space manufactured on the iron core. The central shaft movably passes within the coil and is connected to a push button (7) vertically passing through the upper cap and extending into the accommodating space. A partition part (301) for dividing the central shaft into two halves is further manufactured on the central shaft. A first magnetic element (8) is provided on the upper half portion of the central shaft, and a reset spring (9) is provided on the lower half portion of the central shaft. When the push button is pressed, the electromagnetic assembly provides a controllable magnetic force to interact with the first magnetic element, such that the central shaft reciprocately moves in a short stroke in a vertical direction and extends/retracts along a guide hole (104) manufactured at the center of the bottom of the base to correspondingly turn on or turn off the button switch.

Description

A short-stroke key switch

Technical field

The invention relates to the technical field of electronic products, in particular to a short-stroke key switch.

Background technique

With the continuous progress of people's lives, the use of computers has become more and more popular in society and has become an indispensable item in people's lives. As an indispensable input device for computers, the keyboard has more and more functions and types. The keyboard is a frequently used computer peripheral device. Its operating performance has been gradually improved with the continuous innovation of technology, from mechanical to Optoelectronics, from optoelectronics to optics, from wired to wireless, the reliability and functionality of keyboards are getting better and better.

The existing non-contact key switch emits a light source through a transmitting device (PT), and the emitted light source is received by a symmetrically arranged receiving device (IR). The central axis of the key switch is opposed to the transmitting device during the vertical reciprocating motion. The emitted light source is blocked, and the button is turned on when the receiving device cannot receive the light source; there is also a button that increases the pressing strength of the above non-contact button switch, that is, a magnetic element is arranged on the axis of the button. The keys are constructed as magnetic keys through adaptation. For the above non-contact keys with magnetic elements, the settings are: before the key shaft reaches the conductive position, a signal is given to the key to apply a magnetic force to the magnetic element and produce a reverse force. When the shaft moves to the When the light source emitted by the transmitting device is blocked and cannot be received by the receiving device, the button is turned on, and the reverse force is used to offset and balance the pressure of pressing the key shaft, so that when the key shaft of the button moves to the on position, the key shaft is on. The applied pressing force is offset with the reverse force, so the button has a good pressing feeling in place.

The above non-contact key switches with added magnetic elements are long-stroke key switches. In order to achieve magnetic adjustment of the pressing strength, a magnet or magnetic element with high magnetic field strength can be set to complete the corresponding function, and the magnet or magnetic element with high magnetic field strength , It will inevitably require a larger space for assembly, and for long-stroke key switches, it meets and has a larger assembly space, but for short-stroke key switches, such as mouse buttons, the stroke of such key switches It is usually 0.3～0.5mm. When the size of the key switch is small and the key stroke is short, the internal assembly space of the key will inevitably be small. At this time, the use of conventional magnetic elements to adjust the pressing intensity control is obviously not satisfactory The control requirement, that is, the use of conventional magnetic elements, the magnetic force generated cannot offset and balance the pressure of pressing the key shaft, and increasing the magnetic field strength of the conventional magnetic elements will make it impossible to assemble.

Therefore, the creator of this study designed a short-stroke key switch to solve the above-mentioned problems.

Summary of the invention

The technical problem solved by the present invention is to provide a short-stroke key switch in view of the above-mentioned defects in the prior art. The short-stroke key switch has a compact structure, good push-down feel, good stability and product consistency.

In order to solve the above technical problems, a technical solution adopted by the present invention is as follows: A short-stroke key switch includes a base, a groove is formed on the base, and an upper cover that is buckled with it is provided on the base, so The upper cover closes the groove and forms a accommodating space for accommodating the central shaft and the electromagnetic component. The electromagnetic component includes a coaxially arranged iron core and a coil, and the iron core is fixed in the recess of the base. In the slot, the coil is embedded in the installation space made on the iron core; the central axis is movably installed in the coil and is connected with a handle that vertically penetrates the upper cover and extends into the accommodating space , The middle shaft is also provided with a partition that divides it into two halves, the upper half of the middle shaft is provided with a first magnetic element, and the lower half of the middle shaft is provided with a return spring; According to the handle, the electromagnetic component provides a controllable magnetic force to interact with the first magnetic element, which enables the central shaft to reciprocate in a short vertical stroke and extend/retract along the guide hole made in the center of the bottom of the base , The matching key switch is turned on or off.

As a further explanation of the above technical solution:

In the above technical solution, the first magnetic element is movably sleeved on the upper half of the central shaft, and the coil is an energizing coil with adjustable energization current, which adjusts the reverse or forward energization current of the coil, It can generate repulsive force or attractive force between the electromagnetic component and the first magnetic element, matching to keep the first magnetic element in the upper half of the central axis or make the first magnetic element move along the bottom of the central axis and hit the dividing part and produce the lower part. Suppress a sense of paragraph.

In the above technical solution, the coil is a cylindrical coil, the central axis is movably installed in the hollow space of the coil, and the central axis is also set to divide the central axis when the handle is not pressed. The part is located in the hollow space of the coil and makes the bottom end surface of the first magnetic element lower than the top end surface of the coil.

In the above technical solution, the coil is a copper coil or an aluminum coil, and the first magnetic element is a silicon steel sheet or a magnet.

In the above technical solution, a convex part is provided at the center of the bottom of the groove, a first groove is recessed on the convex part, and one end of the return spring is embedded in the first groove and movably connected with the base. One end is pierced on the central shaft and is movably connected with the dividing part.

In the above technical solution, the iron core is a cylindrical iron core, and an annular groove is made at the bottom of the installation space, the coil is embedded in the annular groove, and an inlay is made at the bottom of the iron core. Embedding hole

In the above technical solution, a plurality of buckles are formed on the peripheral side of the base, and the peripheral sides of the upper cover are formed with buckle grooves that match the buckles in position and number, and each of the buckles is embedded in the buckle. In the groove, the matching base is snap-connected with the upper cover.

In the above technical solution, the top of the base is also provided with a positioning rivet column, a position hole is set on the position matching the positioning rivet column on the upper cover, and the positioning rivet column is implanted in the matching positioning hole and is connected to the upper cover. The cover is riveted to match the base and the upper cover.

In the above technical solution, by pressing the pressing handle, the controllable magnetic force provided by the electromagnetic component interacts with the first magnetic element, so that the central shaft can reciprocate within a vertical stroke of 0.3-0.5 mm.

Compared with the prior art, the beneficial effect of the present invention is that: the key switch of the present invention adopts an electromagnetic component similar to an electromagnet function composed of an iron core and a coil and the first magnetic component is magnetically attracted to each other, and can be used in a smaller assembly space. In the case of short-stroke requirements, the function of increasing the pressing strength is realized. The iron core and the coil can produce high magnetic field strength, so that when the electromagnetic component interacts with the first magnetic element, it can produce matching magnetic force balance to press the key shaft The short-stroke key switch of the present invention has a compact structure, a good press-down feel, stability and product consistency.

Description of the drawings

Figure 1 is a perspective view of the key switch of this embodiment;

Figure 2 is an exploded view of the key switch of this embodiment;

Figure 3 is another exploded view of the key switch of this embodiment.

Fig. 4 is a half-sectional view of the key switch of this embodiment.

Detailed ways

The present invention will be further described in detail below in conjunction with the drawings.

The embodiments described by referring to the drawings are exemplary, and are intended to explain the present application, but should not be understood as a limitation to the present application. In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise" and other directions or positions indicated The relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore It cannot be understood as a restriction on this application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of this application, "several" and "multiple" mean two or more than two, unless specifically defined otherwise. In this application, unless otherwise clearly specified and limited, the terms "installation", "connected", "connected", "fixed" and other terms should be interpreted broadly, for example, it can be a fixed connection or a detachable connection , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In this application, unless expressly stipulated and defined otherwise, the first feature “on” or “under” the second feature may include the first and second features in direct contact, or may include the first and second features Not in direct contact but through other features between them. Moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature being directly above and obliquely above the second feature, or it simply means that the first feature is higher in level than the second feature. The "below", "below" and "below" of the first feature of the second feature include the first feature directly above and diagonally above the second feature, or it simply means that the level of the first feature is smaller than the second feature

Figures 1-4 illustrate a specific embodiment of the present invention. With reference to Figures 1-4, a short-stroke key switch includes a base 1, a groove 101 is formed on the base 1, and the base 1 The upper cover 2 is buckled connected to it. In this embodiment, a number of buckles 102 are formed on the peripheral side of the base 1, and the upper cover 2 is formed with buckles 102 in position and number. 102 matching buckle grooves 201, each of the buckles 102 is embedded in the buckle groove 201, and the base 1 and the upper cover 2 are buckled connected; in this embodiment, the top of the base 1 is also provided with a positioning A rivet post 103, a position hole 202 is set at a position matching the positioning rivet post 103 on the upper cover 2, and the positioning rivet post 103 is implanted in the matching positioning hole 202 and riveted with the upper cover 2 to match the base 1 The upper cover 2 is fixedly connected to the upper cover 2; the upper cover 2 closes the groove 101 and constitutes an accommodating space for accommodating the central shaft 3 and the electromagnetic component 4, and the electromagnetic component 4 includes a coaxially arranged iron core 5 and The coil 6, the iron core 5 is fixed in the groove 101 of the base 1, the coil 6 is embedded in the installation space 501 made on the iron core 5, and the iron core 5 is a cylindrical iron Core, and an annular groove 502 is made at the bottom of the installation space 501, the coil 6 is embedded in the annular groove 502, the coil 6 and the iron core 5 can form a closed magnetic flux loop; The shaft 3 is movably installed in the coil 6 (the central shaft 3 is placed in the installation space 501) and is connected to the pressing handle 7 that vertically penetrates the upper cover 2 and extends into the accommodating space, and the central shaft 3 is also There is a partition 301 that divides it into two halves. The upper half of the central shaft 3 is provided with a first magnetic element 8, and the lower half of the central shaft 3 is provided with a return spring 9; pressing the button Handle 7, the electromagnetic component 4 provides a controllable magnetic force to interact with the first magnetic element 8, enabling the central shaft 3 to reciprocate in a short vertical stroke and extend along the guide hole 104 made in the center of the bottom of the base 1. Out/back, the matching key switch is turned on or off. In this embodiment, press the handle 7, and the controllable magnetic force provided by the electromagnetic component 4 interacts with the first magnetic element 8, enabling centering The shaft 3 reciprocates within a vertical stroke of 0.3-0.5mm.

Preferably, referring to FIGS. 1-4, in this embodiment, the first magnetic element 8 is movably sleeved on the upper half of the central shaft 3, and the coil 6 is an energized coil with adjustable energization current. , Adjust the reverse or forward current of the coil 6 (including no current), which can make the electromagnetic component 4 and the first magnetic element 8 generate repulsive force or attraction, and match to keep the first magnetic element 8 on the central axis 3. Or make the first magnetic element 8 move to the bottom along the central axis 3 and hit the dividing portion 301 and generate a sense of pressure; it should be noted that the coil 6 is energized in the opposite direction, and the electromagnetic component 4 is The magnetic force of the magnetic element 8 is mutually repelling, and the mutually repelling magnetic force and the gravity greater than or equal to the first magnetic element 8, so that the first magnetic element 8 is in the upper half of the central axis 3 or is resisted by the upper cover 2, and When the current is not energized (the forward current is 0) and the forward current is energized, the first magnetic element 8 falls on the dividing portion 301, or the electromagnetic component 4 attracts the magnetic force of the first magnetic element 8 to cause the first magnetic element 8 moves to the bottom along the central axis 3 and hits the partition 301, producing a sense of pressing down paragraphs.

In this embodiment, as a preference, the coil 6 is a cylindrical coil, the central shaft 3 is movably installed in the hollow space 601 of the coil 6, and the central shaft 3 is also set to not press the handle At 7 o'clock, the dividing portion 301 of the central axis 3 is located in the hollow space 601 of the coil 6 and the bottom end surface of the first magnetic element 8 is lower than the top end surface of the wire 6 turns; preferably, the coil 6 is made of copper A coil or an aluminum coil, the first magnetic element 8 is a silicon steel sheet or a magnet; in this embodiment, the bottom center of the groove 101 is provided with a convex portion 105, and the convex portion 105 is recessed with a first groove 106. One end of the return spring 9 is embedded in the first groove 106 and is movably connected to the base 1, and the other end passes through the center shaft 3 and is movably connected to the dividing portion 301; in this embodiment The iron core 5 is a cylindrical iron core, and the bottom of the iron core 5 is provided with an embedded hole 503 inlaid with the convex portion 104.

The above does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims

A short-stroke key switch, which is characterized in that it comprises a base, a groove is made on the base, an upper cover is provided on the base, and the upper cover is connected with the buckle, and the upper cover closes the groove and constitutes a container The accommodating space of the central axis and the electromagnetic component, the electromagnetic component includes a coaxially arranged iron core and a coil, the iron core is fixed in the groove of the base, and the coil is embedded in the In the installation space on the iron core; the central shaft is movably installed in the coil and connected with the handle that vertically penetrates the upper cover and extends into the accommodating space, and the central shaft is also made to distinguish them It is a partition of the two halves, the upper half of the central shaft is provided with a first magnetic element, and the lower half of the central shaft is provided with a return spring; pressing the handle, the electromagnetic component provides controllable The magnetic force interacts with the first magnetic element, so that the central shaft can reciprocate in a short vertical stroke and extend/retract along the guide hole made at the bottom center of the base, and the matching key switch is turned on or off.
The short-stroke key switch according to claim 1, wherein the first magnetic element is movably sleeved on the upper half of the central shaft, and the coil is an energized coil with adjustable energization current, Adjusting the reverse or forward current of the coil can generate repulsive force or attraction between the electromagnetic component and the first magnetic element, matching to keep the first magnetic element on the upper half of the central axis or make the first magnetic element along The bottom of the middle axis moves and hits the dividing part and produces a sense of pressing down.
The short-stroke key switch according to claim 2, wherein the coil is a cylindrical coil, the central axis is movably installed in the hollow space of the coil, and the central axis is also set to When the pressing handle is pressed, the dividing part of the central shaft is located in the hollow space of the coil and the bottom end surface of the first magnetic element is lower than the top end surface of the coil.
The short-stroke key switch according to claim 3, wherein the coil is a copper coil or an aluminum coil, and the first magnetic element is a silicon steel sheet or a magnet.
The short-stroke key switch according to any one of claims 1 to 4, wherein a convex part is provided in the center of the bottom of the groove, and a first groove is recessed on the convex part, and the reset One end of the spring is embedded in the first groove and movably connected with the base, and the other end is pierced on the central shaft and movably connected with the dividing part.
The first short-stroke key switch according to claim 5, wherein the iron core is a cylindrical iron core, and an annular groove is formed at the bottom of the installation space, and the coil is embedded in the annular concave In the groove, the bottom of the iron core is provided with an embedded hole inlaid with the convex part.
The short-stroke key switch according to claim 6, wherein a plurality of buckles are made on the peripheral side of the base, and the peripheral sides of the upper cover are made to match the buckles in position and number. Buckle grooves, each of the buckles is embedded in the buckle groove to match the base and the upper cover with a buckle connection.
The short-stroke key switch according to claim 7, wherein the top of the base is further provided with a positioning rivet post, and a position hole is set on the upper cover that matches the positioning rivet post, and The positioning rivet column is implanted in a matching positioning hole and riveted with the upper cover, so that the base and the upper cover are fixedly connected by matching.
The short-stroke key switch according to claim 8, wherein the controllable magnetic force provided by the electromagnetic component interacts with the first magnetic element by pressing the handle, so that the central axis can be between 0.3-0.5 It moves back and forth within a vertical stroke of mm.