CN201946465U - Shrapnel Switch Assembly - Google Patents

Abstract

The utility model discloses a shell fragment switch module for in the keyboard of electronic product, shell fragment switch module set up in between the silica gel base button and the printed circuit board of keyboard, shell fragment switch module includes film, spacer and metal shrapnel, the middle part of film have with metal shrapnel matched with radian, metal shrapnel's upper surface with the middle part of film is in the same place with gaplessly, the edge-fixed in of film on the spacer, the spacer is fixed on the printed circuit board. The utility model discloses metal shrapnel among the shell fragment switch module laminates on the film fully, avoids metal shrapnel to produce the off normal phenomenon in the use to can improve shell fragment switch module's pressing and feeling and performance.

Description

Shrapnel switch assembly

technical field

The utility model relates to electronic product accessories, in particular to a shrapnel switch assembly used in a keyboard of an electronic product.

Background technique

In a modern information society with highly developed information and communication systems, electronic devices are widely used in various fields, such as mobile phones, MP3 and PDA, and other electronic products are widely used in daily life, and people can exchange information anytime and anywhere with the help of mobile phones , experience sharing and communication of opinions, while MP3 can bring entertainment and relax people. With the increasing popularity of electronic equipment, the increasing maturity of technology, the increasingly changeable appearance and the decreasing volume, how to improve the usability of the operating keyboard of electronic products has become one of the important issues in current design.

Taking a mobile phone as an example, a general mobile phone keypad is shown in FIG. 1 , which includes: an upper packaging cover 1 , a lower packaging cover 2 , and key modules placed in the upper and lower packaging covers. The button module includes: a printed circuit board 3 formed with a conductive terminal 3a; a dome switch assembly 4 arranged on the above-mentioned printed circuit board 3 for selectively connecting or conducting with the conductive terminal 3a; Above the component 4, there is a light guide plate 7 that can diverge the light emitted by the indicator light; and a silicone-based button 9 that is arranged on the upper package cover 1 and applies pressure to the dome switch component 4 to deform it. In this way, when the user presses the silicone-based button 9 and then releases it, the central part of the dome switch assembly 4 produces a concave elastic deformation, thereby contacting and conducting with the conductive terminal 3a to act as a switch. Specifically, the shrapnel switch assembly 4 in the above-mentioned button module includes a metal shrapnel 4a, a spacer 4b and a film 4c, the spacer 4b is fixed on the circuit board 3, and an accommodating hole is opened on it, and the metal The shrapnel 4a is placed in the accommodating hole of the spacer 4b, and the film 4c simultaneously covers the metal dome 4a and the dome 4b to fix the position of the metal dome 4a. However, since the film 4c is a flat sheet structure before it is attached to the metal dome, while the metal dome 4a has a certain curvature and is generally rounded, when the film 4c is attached to the metal dome 4a, it is only a metal dome. The top of the shrapnel 4a can be glued together with the film 4c, and the film 4c cannot be pasted on the entire upper surface of the metal dome 4a. Therefore, the connection between the metal dome 4a and the film 4c is not firm. During use, the metal dome 4a It is easy to produce offset phenomenon, which affects the pressing feel and performance of the keys

Therefore, there is an urgent need for a dome switch assembly that can improve the pressing feel and performance of the key to solve the above-mentioned defects.

Utility model content

The purpose of the utility model is to provide a shrapnel switch assembly that can improve the pressing feel and performance of the key to solve the above-mentioned defects.

In order to achieve the above object, the utility model provides a dome switch assembly, which is used in the keyboard of an electronic product. The dome switch assembly is arranged between the silicone-based keys of the keyboard and the printed circuit board. The dome switch assembly includes A film, a spacer and a metal shrapnel, the middle part of the film has a radian matching the metal shrapnel, the upper surface of the metal shrapnel and the middle part of the film are bonded together without gaps, and the edge of the film is It is fixed on the spacer, and the spacer is fixed on the printed circuit board.

Compared with the prior art, the utility model has an arc-shaped structure matched with the metal shrapnel because the film in the shrapnel switch assembly of the utility model has an arc structure, and the metal shrapnel can be completely attached to the film and firmly fixed together to avoid The displacement phenomenon occurs during use, thereby improving the pressing feel and performance of the shrapnel switch assembly.

In a preferred embodiment of the present invention, the film includes a high polymer layer and a viscous adhesive layer, and the adhesive layer is bonded to the upper surface of the metal elastic sheet and the upper surface of the spacer at the same time.

Preferably, the spacer includes a high polymer layer and an adhesive layer, and the adhesive layer is bonded to the upper surface of the printed circuit board.

Also preferably, the thickness of the metal shrapnel is 0.055mm.

Description of drawings

FIG. 1 is a schematic diagram of a cross-sectional structure of a traditional mobile phone keyboard.

Fig. 2 is a schematic cross-sectional structure diagram of a dome switch assembly of the present invention.

Fig. 3 is the layer structure of the film in the dome switch assembly of the utility model.

Fig. 4 is the layer structure of the spacer in the dome switch assembly of the utility model.

Detailed ways

The technical solutions in the embodiments will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to Fig. 2, the shrapnel switch assembly 10 of the present embodiment is used on a mobile phone keyboard (taking the traditional mobile phone keyboard shown in Fig. 1 as an example), and it is arranged between the silica gel-based button 9 and the printed circuit board 3 of the mobile phone keyboard, The dome switch assembly 10 includes a film 110, a spacer 120 and a metal dome 130. The middle portion 110a of the film 110 has a curvature matching the metal dome 130. Specifically, in this embodiment, the metal dome 130 It is punched into a circular arch shape, and the middle part of the film 110 is also punched into a circular arch shape corresponding to the metal dome 130 . The upper surface of the metal dome 130 is bonded to the middle portion 110a of the film 110 without gaps, the edge 110b of the film 110 is fixed on the spacer 120, and the spacer 120 is further fixed on the spacer. on the printed circuit board 3 and make the center of the metal dome 130 align with the conductive terminal 3 a on the printed circuit board 3 .

Preferably, the metal dome 130 has a thickness of 0.055mm, which is convenient for being stamped into a circular arch shape, and can improve the click feel while ensuring the service life of the metal dome 130 .

Preferably, as shown in FIG. 3 and FIG. 4 , the film 110 is composed of upper and lower layers, which are respectively a high polymer layer 111 and an adhesive layer 112 . Likewise, the spacer 120 has the same layer structure as the film 110 , that is, includes a high polymer layer 121 and an adhesive layer 122 . The middle part of the adhesive layer 112 of the film 110 is bonded to the upper surface of the metal dome 130, while its edge is pasted on the high polymer layer 121 of the spacer 120, and the adhesive layer 122 of the spacer 120 is then It is further pasted on the printed circuit board 3 , so that the metal dome 130 can be firmly fixed on the printed circuit board 3 without any deviation.

Compared with the prior art, the utility model has an arc-shaped structure matched with the metal shrapnel because the film in the shrapnel switch assembly of the utility model has an arc structure, and the metal shrapnel can be completely attached to the film and firmly fixed together to avoid The displacement phenomenon occurs during use, thereby improving the pressing feel and performance of the shrapnel switch assembly.

What is disclosed above is only the preferred embodiment of the present utility model, and of course the scope of rights of the present utility model cannot be limited with this. Therefore, the equivalent changes made according to the patent scope of the utility model still belong to the scope covered by the utility model .

Claims (4)

1. elastic sheet switch assembly, be used in the keyboard of electronic product, described elastic sheet switch assembly is arranged between the silica gel base button and printed circuit board (PCB) of described keyboard, described elastic sheet switch assembly comprises film, partition and metal clips, it is characterized in that: the middle part of described film has the radian that matches with described metal clips, the upper surface of described metal clips and the middle part of described film seamlessly fit together, the edge of described film is fixed on the described partition, and described partition is fixed on the described printed circuit board (PCB).

2. elastic sheet switch assembly as claimed in claim 1 is characterized in that: described film comprises high polymer layer and the glue-line with viscosity, and described glue-line is bonding with the upper surface of the upper surface of described metal clips and partition simultaneously.

3. elastic sheet switch assembly as claimed in claim 1 is characterized in that: described partition comprises high polymer layer and the glue-line with viscosity, and the upper surface of described glue-line and described printed circuit board (PCB) is bonding.

4. elastic sheet switch assembly as claimed in claim 1 is characterized in that: the thickness of described metal clips is 0.055mm.

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