Piezoelectric electret film button

Abstract

The invention discloses a piezoelectric electret film key. The piezoelectric electret film key is characterized in that a piezoelectric electret film is adopted as a force sensitive element of the key; a plurality of key areas are arranged on the piezoelectric electret film; the upper surface and the lower surface of the piezoelectric electret film are coated with upper surface electrodes and lower surface electrodes which are vertical to the key areas and are in one-to-one correspondence with the key areas; the outer layers of the upper surface electrodes are covered with one surface layer; the lower surface electrodes are bonded on a key base layer; an upper surface encapsulation layer is arranged between the surface layer and the upper surface electrodes; a lower surface encapsulation layer is arranged between the lower surface electrodes and the base layer; and a shielding layer is arranged between the lower surface encapsulation layer and the base layer. The piezoelectric electret film key is advantageous in high sensitivity and strong stability. The piezoelectric electret film key is flexible and can be bent freely, and can identify key pressing strength and has functions such as sliding control.

Description

technical field

[0001] The invention relates to the technical field of keyboard keys, in particular to a piezoelectric electret film key. Background technique

[0002] The button mentioned in this article mainly refers to the button used to control whether a circuit has electrical signal generation or the direction and size of the electrical signal flow; the most common form of button is a switch.

[0003] At present, the traditional buttons mainly include: silicone buttons, membrane buttons, capacitive buttons and PVDF piezoelectric film buttons; these buttons have a wide range of applications in life, and they are introduced respectively below.

[0004] Silicone button is a button mainly made of silica gel. It has the advantages of good hand feeling and low price, so it is widely used in traditional digital products such as computers, remote controls, mobile phones and computer keyboards. However, there are still shortcomings such as short life (300,000 times), large volu...

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