WO2020191680A1

WO2020191680A1 - Key structure capable of reducing pressing feeling of elastic piece and electronic device

Info

Publication number: WO2020191680A1
Application number: PCT/CN2019/079934
Authority: WO
Inventors: 曹传春; 李明; 丁进新; 黎启东; 胡念
Original assignee: 深圳市汇创达科技股份有限公司
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-10-01

Abstract

Provided are a key structure capable of reducing pressing feeling of elastic piece and an electronic device, the key structure comprises: a fixed switch component having an electrode which can be conducted to carry out key identification; a movable switch component, which is arranged correspondingly to the fixed switch component and can be deformed so that a fixed switch is switched on or off; and a fixed component, which is used for maintaining a fixed relative position relationship between the movable switch component and the fixed switch component fixed, wherein the fixed component is provided with a recessed portion for accommodating the movable switch component in advance, and the fixed component is arranged in the recessed portion. The fixed component is provided with the recessed portion for accommodating the movable switch component in advance, and the fixed component is arranged in the recessed portion, so that the pressing on the movable switch component is reduced through the recessed portion, on one hand, the key stroke can be prolonged, and on the other hand, the hand feeling of the key can be enhanced.

Description

Key structure and electronic device capable of reducing the pressure of shrapnel

Technical field

The invention discloses a key structure, in particular a key structure and electronic equipment capable of reducing the pressure of an elastic sheet, and belongs to the technical field of electronic products.

Background technique

The keyboard or key is one of the indispensable accessories of a computer. The traditional keyboard has no structural restrictions, and most of its keys adopt a scissor-foot structure. The scissor-foot keyboard structure has a long key stroke and a good feel. However, its disadvantage is the keys. It is thick and cannot be ultra-thin. With the increasing development of electronic products, the degree of miniaturization and thinning has intensified. The traditional scissor-foot structure keyboard has long been unable to meet people's needs. Therefore, the ultra-thin keyboard structure has emerged. The thin keyboard structure generally uses DOME (ie, metal shrapnel) as the conduction element for circuit conduction to reduce the thickness of the entire product.

At present, DOME is usually installed with the circuit board through the DOME mounting film (usually using polyester film, also called Mylar). The Mylar attached to the shrapnel is a flat membrane structure with glue on one side, and the entire switch is attached to After the keyboard is installed, because Mylar's own stretchability is not enough to offset the thickness of the shrapnel itself, this will cause the shrapnel to be kept under pressure after placement, and the total height will become lower after placement. Please refer to Figure 1 . In this way, not only will the entire key stroke be shortened, but also the click ratio of the keys will be affected. After the keys are assembled with traditional technology, the click ratio will drop by about 10%, and the hand feeling will be worse than that of the shrapnel itself.

technical problem

Aiming at the shortcomings of short keystroke and poor hand feeling in the prior art mentioned above that Mylar is used to directly fix DOME, the present invention provides a key structure and electronic device that can reduce the pressure of shrapnel. A recessed portion for accommodating the movable switch member is provided in advance, and the fixing member is provided in the recessed portion.

Technical solutions

The technical solution adopted by the present invention to solve its technical problem is: a key structure that can reduce the pressure of the shrapnel, the key structure includes:

Fixed switch member, which has electrodes that can be turned on for key recognition;

The movable switch member is arranged corresponding to the fixed switch member, and the fixed switch is turned on or off through the deformation of the movable switch member;

The fixed member is used to maintain a fixed relative position relationship between the movable switch member and the fixed switch member. The fixed member is pre-disposed with a recess for accommodating the movable switch member, and the fixed member is arranged in the recess.

An electronic device includes more than one button structure capable of reducing the pressure of the shrapnel as described above, and the button structure corresponds to the button setting on the electronic device.

The technical scheme adopted by the present invention to solve its technical problems further includes:

The button structure includes a supporting member, and the fixed switch member is fixedly arranged on the supporting member.

The supporting member is fixedly provided with an isolating member, the fixing member is arranged above the isolating member, the isolating member is provided with a hollow portion corresponding to the position of the fixed switch member, and the fixed switch member is arranged in the hollow portion.

The sum of the height of the recess on the fixed member and the thickness of the isolation member is equal to or greater than the height of the movable switch member in a natural state.

The area of the depression on the fixed member in the plan direction is larger than the area of the movable switch member in the natural state.

A convex point is fixedly arranged on the fixed member corresponding to the position of the movable switch member, and the convex point is arranged above or below the fixed member.

The said convex point is arranged corresponding to the center position of the movable switch member.

The cross section of the recess on the fixed component is arc-shaped, and the radius of the arc of the recess is greater than or equal to the arc radius of the cross-section of the movable switch member.

Beneficial effect

In the present invention, the fixing member is provided with a recessed portion for accommodating the movable switch member in advance, the fixing member is arranged in the recessed portion, and the depression on the movable switch member is reduced by the recessed portion. It can enhance the feel of the keys and keep the Click ratio within the parameters of the shrapnel itself, without causing the click ratio to decrease.

Description of the drawings

Figure 1 is a partial cross-sectional structure diagram of a conventional key structure.

Fig. 2 is a partial cross-sectional structure diagram of the key structure of the present invention.

In the figure, 1- circuit board, 2- shrapnel, 3- fixed film, 4- gasket, 5- bump, 6-adhesive layer.

The best mode of the invention

[0007] This embodiment is a preferred embodiment of the present invention, and all other principles and basic structures that are the same as or similar to this embodiment are all within the protection scope of the present invention.

Please refer to Figure 1 and Figure 2 in combination, the present invention is mainly a key structure that can reduce the pressure of the shrapnel, the key structure mainly includes: (1), a fixed switch member, which can be turned on for key recognition Electrode; (2), the movable switch member, which is arranged corresponding to the fixed switch member, through the deformation of the movable switch member, the fixed switch is turned on or off; (3), the fixed member is used to maintain the movable switch The relative positional relationship between the component and the fixed switch component is fixed, the fixed component is pre-disposed with a recess for accommodating the movable switch component, and the fixed component is arranged in the recess.

The fixed switch member and the movable switch member are arranged correspondingly. When the movable switch member is pressed to make it deform, the two electrodes of the fixed switch member can be conducted through the movable switch member to make it perform key recognition. In the example, the fixed switch member is a switch electrode attached to the circuit board 1. In this embodiment, the movable switch member is a deformable component, and when deformed, the electrode on the fixed switch member can be conducted. In this embodiment, the movable switch member adopts DOME, which is also called elastic sheet 2.

In this embodiment, the fixed switch member is attached to the supporting member. The supporting member is usually a circuit board 1. The circuit board 1 can be a PCB or FPC, or a flexible and hard board can be used to fix the switch member (ie electrode) and wire attachment On the circuit board 1, during specific implementation, other forms of support members can also be selected according to actual needs. In this embodiment, the support member (mainly the circuit board 1) is fixedly attached with an isolation member, or it can also be called a protective member. The isolation member uses a gasket 4 (namely SPACER). The gasket 4 has an isolation function. It also has the effect of protecting the circuit on the supporting member. In this embodiment, the gasket 4 is bonded to the supporting member through the adhesive layer 6, and the gasket 4 is provided at a position corresponding to the movable switch member. Hollow, the movable switch member is arranged in the hollow on the gasket 4. In this embodiment, the area of the hollow on the gasket 4 is larger than the area occupied by the movable switch member in its natural state, and also greater than or equal to the movable switch member The area occupied in the deformed state (that is, when squeezed), that is, the position of the hollow will not have any effect on the deformation of the movable switch member.

The movable switch member is arranged corresponding to the fixed switch member through the fixed member. In this embodiment, the fixed member, the fixed film 3, is made of polyester film (also called Mylar), and the fixed member is pre-installed with The recessed part of the movable switch component, and the fixing member is arranged in the recessed part, and the recessed part can be formed by hot pressing with a hot pressing die before assembly, and it can also be processed by other processing techniques during specific implementation. The sum of the height of the recess on the fixed member and the thickness of the isolation member is equal to or greater than the height of the movable switch member in a natural state, so that the movable switch member can be smoothly installed on the circuit board 1 through the fixed member. The sum of the height of the recess on the fixing member and the thickness of the isolation member can be equal to or slightly greater than the height of the movable switch member in a natural state, so that it will not deform in the natural state and will not affect its normal use. In this embodiment, the area of the depression on the fixed member in the plan direction is larger than the area of the movable switch member in its natural state, so that it can completely cover the movable switch member. In this embodiment, the depression on the fixed member The cross section is arc-shaped, the cross-section of the movable switch member is arc-shaped, and the radius of the arc of the concave portion is greater than or equal to the radius of the arc of the movable switch member.

In this embodiment, a convex point 5 (PLUNGER) is fixedly arranged on the fixed member corresponding to the position of the movable switch member, and the convex point 5 is arranged above or below the fixed member. Preferably, it is arranged above the fixed member. Processing, on the other hand, the use effect is also better. The bump 5 is provided corresponding to the center position of the movable switch member.

In this embodiment, the thickness of the shrapnel 2 is 0.06±0.005mm, the height of the shrapnel 2 is 0.38±0.01mm, the thickness of the fixed film 3 is 0.05±0.005mm, the height of the recess is 0.38±0.01mm, and the thickness of the gasket 4 is 0.075±0.005. mm.

The present invention also protects an electronic device that includes more than one key structure that can reduce the pressure of the shrapnel as described above, and the key structure corresponds to the key setting on the electronic device. The electronic device can be a notebook computer, an ultra-thin keyboard, etc. , The buttons of the electronic device can all adopt the above-mentioned button structure, or partially adopt the above-mentioned button structure.

Claims

A key structure capable of reducing the pressure of shrapnel, characterized in that: the key structure includes

Fixed switch member, which has electrodes that can be turned on for key recognition;

The movable switch member is arranged corresponding to the fixed switch member, and the fixed switch is turned on or off through the deformation of the movable switch member;

The fixed member is used to maintain a fixed relative position relationship between the movable switch member and the fixed switch member. The fixed member is pre-disposed with a recess for accommodating the movable switch member, and the fixed member is arranged in the recess.
The button structure capable of reducing the pressure of the elastic sheet according to claim 1, wherein the button structure includes a supporting member, and the fixed switch member is fixedly arranged on the supporting member.
The button structure capable of reducing the pressure of the shrapnel according to claim 2, characterized in that: the supporting member is fixedly provided with an isolating member, the fixing member is arranged above the isolating member, and the isolating member corresponds to the position of the fixed switch member A hollow part is provided, and the fixed switch component is arranged in the hollow part.
The button structure capable of reducing the pressing feeling of the elastic sheet according to claim 3, wherein the sum of the height of the recess on the fixed member and the thickness of the isolation member is equal to or greater than the height of the movable switch member in a natural state.
The button structure capable of reducing the pressing feeling of the shrapnel according to claim 1, wherein the area of the depression on the fixed member in the plan direction is larger than the area of the movable switch member in a natural state.
The button structure capable of reducing the pressing feeling of the shrapnel according to claim 1, characterized in that: the fixed member is fixedly provided with a convex point corresponding to the position of the movable switch member, and the convex point is arranged above or below the fixed member.
The button structure capable of reducing the pressing feeling of the shrapnel according to claim 1, wherein the cross section of the recess on the fixing member is arc-shaped.
An electronic device, characterized in that: the electronic device comprises more than one button structure capable of reducing the pressure of the shrapnel according to any one of claims 1 to 7, and the button structure corresponds to the button setting on the electronic device .