KR101724842B1

KR101724842B1 - Notch type slim metal plate touch pad using piezo effect

Info

Publication number: KR101724842B1
Application number: KR1020150066535A
Authority: KR
Inventors: 김수호; 홍성욱
Original assignee: 주식회사 우정하이텍
Priority date: 2015-05-13
Filing date: 2015-05-13
Publication date: 2017-04-07
Also published as: KR20160133691A

Abstract

The present invention relates to a touch pad. More particularly, the present invention relates to a touch pad, and more particularly, to a touch pad capable of realizing a remarkably slim design in a metal material and capable of stably and sensitively recognizing an output value of the touch key, Type slim metal plate touch pad using an effect.
To this end, the present invention provides a metal plate having a touch key and a notch protruding from a bottom surface thereof; A piezo film disposed at an interval below the metal plate; A base plate for supporting the piezo film and forming a bending space of the piezo film by the notch when a touch key is input; And a control unit for recognizing a touch by a user by analyzing a displacement of the piezo film. The slit metal plate touch pad of the notch type using the piezo effect is provided.

Description

[0001] The present invention relates to a notch type slim metal plate touch pad using a piezoelectric effect,

The present invention relates to a touch pad, and more particularly, to a touch pad that can be implemented slimly in a metal material, can reliably and sensitively recognize an output value of a touch key, and can accurately recognize a touch by a user by filtering an artificial touch error Type slim metal plate touch pad using a piezo effect.

As a touch using a piezo effect of the related art, in order to solve a problem of a touch screen having a transparent electrode, a plurality of piezoelectric elements are provided along a bezel region of a transparent substrate, A touch panel using a piezoelectric element capable of sensing a potential position of a piezoelectric element according to an applied pressure and detecting the touch position has been developed (refer to Korean Patent No. 1329340).

In addition, in order to realize a touch panel using a piezoelectric polymer film as a touch using a piezo effect of the prior art, which is simple in structure and excellent in permeability and capable of recognizing the position of the input and the intensity of the input signal, A touch panel has been developed which recognizes a potential difference generated by a pressure through a transparent electrode using a piezoelectric substrate formed of a film (refer to Korean Patent No. 0980447).

However, the touch devices using the piezo effect of the prior art can not be applied directly to the metal or the new material without additional processing, and are vulnerable to external impact or vibration.

When a ceramic piezoelectric device is used, it can not be implemented in a considerably slim manner. Therefore, it is difficult to apply it to an ultra slim smart phone. If the plate thickness of a metal or the like equipped with a touch key is thick, or the interval between the touch keys is narrow, The output value is not sufficient, so that accurate and stable recognition of the touch by the user is not guaranteed.

Meanwhile, the present applicant has proposed a method of filtering an artificial touch error due to external impact, vibration, or foreign matter such as water or ketchup while using a piezo film, and accurately detecting the touch by the user even if the thickness of the metal plate is thick or the interval between the touch keys is narrow A metal plate touch device capable of accurately and stably recognizing a touch using a recognizable piezo effect has been developed (refer to Korean Patent Application No. 10-2014-0184304).

Korean Patent No. 1329340 (Nov. 31, 2013) Korean Patent No. 0980447 (Aug. 31, 2010) Korean Patent Application No. 10-2014-0184304 (December 19, 2014)

The present invention has been proposed in order to solve the problems of the related art as described above, and it is an object of the present invention to provide a touch sensor which can be applied to a metal material while using a piezo film, can be implemented slimly in an ultra slim smart phone, Type notch type slim metal plate touch pad that can recognize and filter artificial touch errors caused by external impact, vibration, or foreign matter, and that can accurately recognize the touch by the user even if the interval between the touch keys is narrow The purpose is to provide.

In order to achieve the above object, a notch type slim metal plate touch pad using a piezo effect according to the present invention includes a metal plate having a touch key and a notch protruding from a bottom surface thereof; A piezo film disposed at an interval below the metal plate; A base plate for supporting the piezo film and forming a bending space of the piezo film by the notch when a touch key is input; And a controller for analyzing the displacement of the piezo film to recognize a touch by a user.

In another embodiment of the present invention, the piezoelectric film emits ultrasonic waves, and the control unit analyzes the ultrasonic waves reflected by the surface of the metal plate and the touch object contacting the surface thereof to recognize the touch by the user .

Here, the controller not only detects the displacement of the piezo film when the touch key is input, but also recognizes only the touch key whose ultrasound is reflected by the touch object contacting the surface of the metal plate as a touch by the user.

The notch-type slim metal plate touch pad using the piezoelectric effect of the present invention having the above-described structure has the following advantageous effects.

First, the notch of the bottom of the metal plate and the piezo film placed on the top of the base plate allow the touch to be easily applied to the metal material, which can be implemented slimly and the output value of the touch key can be stably and sensitively recognized can do.

Second, while using a Piezo Film, an artificial touch error due to an external shock or vibration or foreign matter such as water or ketchup is filtered (by compensating for the disadvantage of a strain type by an impedance type) It is possible to accurately recognize the touch by the user.

1 is a sectional view of a notch type slim metal plate touch pad using a piezo effect according to the present invention;
2 is a cross-sectional view illustrating a notch type slim metal plate touch pad using a piezo effect according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present embodiment, the same designations and the same reference numerals are used for the same components, and further description thereof will be omitted.

FIG. 1 is a cross-sectional view showing a notch type slim metal plate touch pad using a piezo effect according to the present invention, FIG. 2 is a sectional view showing a notch type slim metal plate touch pad using a piezo effect according to another embodiment of the present invention to be.

1, a notch type slim metal plate touch pad using the piezo effect of the present invention includes a metal plate 100, a piezo film 200, a base plate 300, and a control unit (not shown) .

The metal plate 100 is provided with a plurality of touch keys K1, K2 and K3 and is preferably made of a metal but is not limited thereto. And other general touch panel materials.

A notch 110 protrudes from the bottom surface of the metal plate 100 so as to generate a displacement by pressing the piezo film 200 to be described later when the user touches the metal plate 100. The notch 110 has a touch key ) K1, K2, and K3, respectively.

The notch 110 preferably protrudes downward from the bottom surface of the metal plate 100 in a substantially hemispherical shape. However, the shape of the notch 110 is not limited thereto and may be various shapes such as a cylindrical shape and a polygonal shape.

A Piezo Film 200 is a piezoelectric film disposed at a lower portion of the metal plate 100 with an interval therebetween.

The piezoelectric film 200 is a film capable of changing the mechanical energy and electric energy applied thereto. When the piezoelectric film 200 receives a physical force from the outside, the piezoelectric film 200 generates electrical energy. On the contrary, the piezoelectric film 200 undergoes physical deformation .

At this time, it is preferable that the piezoelectric film 200 is formed in the form of a thin film, but the present invention is not limited thereto and includes a ceramic or other device having a certain thickness capable of exhibiting a piezoelectric effect.

The distance D between the piezo film 200 and the metal plate 100 is set to a distance of several micrometers so that the lower end of the notch 110 is in contact with the upper surface of the piezo film 200 ) Is sufficient.

The base plate 300 supports the piezoelectric film 200 at a lower portion thereof and is pressed by the notch 110 of the metal plate 100 when the user touches the touch key 200, Thereby forming a bending space 310, which is a step that can be turned to a predetermined position.

As shown in FIG. 1, the base plate 300 may form a bending space 310 for each touch key when a touch key is input. For this purpose, Spacers 320 for dividing the space may be provided in the bending space 310 at intervals.

A control section (not shown) analyzes the displacement of the piezoelectric film 200 by the deformation of the metal plate 100 to recognize a touch by a user (hereinafter referred to as a Piezoelectric Mode Detector) Quot; strain type ").

Here, as an embodiment of the present invention, the piezoelectric film 200 emits ultrasonic pulses to the surface of the metal plate 100 by input of an electric signal.

The ultrasound pulse emitted by the piezo film 200 moves to the surface of the metal plate 100 and then a portion of the ultrasound pulse is reflected back downward. At this time, the surface of the metal plate 100 and any touch object ) Of the ultrasonic waves.

Here, the piezoelectric film 200 refers to a portion including a piezoelectric film (Piezo Film Part), which is not merely a film but is electrically connected to a flexible printed circuit board (FPCB) (Not shown in the drawings), and the like.

In the present embodiment, the control section analyzes the ultrasonic wave reflected by the displacement of the piezoelectric film 200 and a touch object such as a finger or a touch pen, which is in contact with the surface of the metal plate 100 and its surface Thereby recognizing the touch by the user.

That is, the controller recognizes the accurate and stable touch by the user and not only detects the displacement of the piezo film 200 to filter the touch error, but also analyzes the ultrasonic waves reflected by various touch objects (Hereinafter referred to as an " impedance type ").

At this time, a separate ultrasonic receiver (not shown) such as a hydrophone array for detecting the ultrasonic waves reflected from the touch object touching the surface of the metal plate 100 and the surface thereof by the impedance type Lt; / RTI >

2, the bent space 310 may be formed to pass through the lower portion of the base plate 300, so that when the user touches the touch key, So that the piezoelectric film 200 can be distorted more sensitively by the piezoelectric film 110.

At this time, it is preferable that the width W of the bending space 310 is increased or decreased in proportion to the thickness of the metal plate 100. In this embodiment as well, as shown in FIG. 1, It is of course possible to configure them individually to form the bending space 310.

The notch type slim metal plate touch pad using the piezo effect of the present invention having the above-described structure basically includes a notch 110 on the bottom surface of the metal plate 100 and a notch 110 on the bottom surface of the base plate 300, It can be easily applied to metal material, can be implemented slimly, and the output value of the touch key can be stably and sensitively recognized.

In addition, as an embodiment of the present invention, touch can be recognized by the user by using the above-described strain type and impedance type touch recognition processes in parallel.

That is, the controller not only senses the displacement of the piezo film 200 when the touch key is pressed (when it is judged that the touch key is pressed), but also detects the displacement of the piezo film 200 by the touch object touching the surface of the metal plate 100 (Impedance type) touch key is recognized as a touch by the user.

This double-touch recognition not only compensates for the impairment type (artificial touch) such as external shock or vibration, which is a disadvantage of the strain type, but also improves the false recognition (artificial touch) due to foreign substances such as water or ketchup, Is complemented by the strain type, the touch by the user can be recognized accurately and stably.

At this time, the touch recognition processes of the strain type and the impedance type are not limited to each other in order, and either one type of recognition process may be performed first or two types of recognition processes may be performed at the same time.

Therefore, the metal plate touch pad according to the present invention overcomes considerably the problem of the application of the metal material of the piezo film and the thickness (slimness) of the touch pad, thereby making it possible to use not only touch menus of various ultra- It can be widely applied to touch technology in various industrial fields where material is main.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or scope of the invention as defined in the appended claims. It is self-evident to those who have.

Therefore, the above-described embodiments are to be considered as illustrative rather than restrictive, and the present invention is not limited to the above description, but may be modified within the scope of the appended claims and equivalents thereof.

100 ... metal plate 110 ... notch
200 ... Piezo film 300 ... Base plate
310 ... flexure space 320 ... spacers
K1, K2, K3 ... Touch key

Claims

A metal plate having a touch key and a notch protruding from a bottom surface thereof;
A piezo film disposed at an interval below the metal plate;
A base plate for supporting the piezo film and forming a bending space of the piezo film by the notch when a touch key is input; And
And a controller for analyzing a displacement of the piezo film to recognize a touch by a user,
The piezoelectric film emits ultrasonic waves,
The controller analyzes the ultrasonic waves reflected by the surface of the metal plate and the touch object contacting the surface of the metal plate to recognize the touch by the user,
Wherein the controller recognizes not only the displacement of the piezo film when the touch key is input but also only the touch key whose ultrasonic wave is reflected by the touch object contacting the surface of the metal plate as a touch by the user. Type slim metal plate touch pad.

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