CN203057505U - Piezoelectric Ceramic Array Thin Film - Google Patents

Abstract

The utility model provides a piezoelectric ceramic array film, comprising a base material and multiple vibration units. The multiple vibration units are arranged on the base material in a mutually independent manner; and each vibration unit comprises a piezoelectric ceramic layer and at least one pair of electrode layers, wherein the piezoelectric ceramic layer is arranged between the at least one pair of electrode layers. The piezoelectric ceramic array film of the utility model employs the mutually independent piezoelectric vibration units to realize diversified control modes; and can realize complex functions such as providing complex feedback signals and demodulating sound signals which can be heard by the ears.

Description

Piezoelectric Ceramic Array Thin Film

technical field

The utility model relates to a piezoelectric ceramic array film with diversified control modes.

Background technique

The ceramic layer in the vibrating layer of the existing piezoelectric ceramic array film is a large complete ceramic sheet, but the electrode layer on it is divided into multiple small pieces, but each small piece of the electrode layer is still connected to each other. When the inverse piezoelectric effect is used, the entire piezoelectric ceramic array film can only receive one input signal and only one vibration state, which cannot realize complex functions and provide a better tactile experience. When using the piezoelectric effect, no matter where the piezoelectric ceramic array film is pressed, there is only one output signal, so it can only provide a very simple feedback signal.

Since the ceramic layer is a large and complete ceramic sheet, it is difficult to form multiple small units with fixed boundaries when the ultrasonic signal is input, so it is difficult to generate nonlinear effects in the air, and it is impossible to demodulate sound signals audible to the human ear.

Utility model content

The technical problem mainly solved by the utility model is that the existing piezoelectric ceramic array film cannot realize complex functions, cannot provide complex feedback signals, and cannot demodulate sound signals audible to human ears.

In order to solve the above technical problems, the embodiment of the utility model discloses a piezoelectric ceramic array film, the piezoelectric ceramic array film includes a base material and a plurality of piezoelectric vibration units, and the plurality of piezoelectric vibration units are independent of each other Arranged on the substrate, each of the piezoelectric vibration units includes a piezoelectric ceramic layer and at least one pair of electrode layers, and the piezoelectric ceramic layer is sandwiched between the at least one pair of electrode layers.

In a preferred embodiment of the present invention, the driving signals received by each of the piezoelectric vibration units at the same time are the same or different.

In a preferred embodiment of the present invention, the piezoelectric ceramic array film includes a protective layer, and the piezoelectric vibration unit is located between the substrate and the protective layer.

In a preferred embodiment of the present invention, both the base material and the protective layer are tough materials.

In a preferred embodiment of the present invention, the piezoelectric ceramic array film includes a filling medium, and the filling medium is located between the base material and the protective layer.

In a preferred embodiment of the present invention, each piezoelectric vibration unit includes a driving signal line and a welding point, the welding point is welded to the electrode layer, and the driving signal line is connected to the welding point .

In a preferred embodiment of the present invention, the plurality of piezoelectric vibration units are distributed in an array on the surface of the substrate.

In a preferred embodiment of the present invention, the area of each piezoelectric vibration unit is less than or equal to 0.25 square centimeters.

In a preferred embodiment of the present utility model, the piezoelectric vibration unit is rectangular, circular, triangular or trapezoidal.

In a preferred embodiment of the present invention, the thickness of the piezoelectric ceramic array film is greater than or equal to 1 mm.

Compared with the prior art, the piezoelectric ceramic array film of the present invention adopts independent piezoelectric vibration units, which can realize diversified control modes, realize complex functions, provide complex feedback signals, and It can demodulate the sound signal audible to the human ear.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work, wherein:

Fig. 1 is the schematic diagram of the three-dimensional structure of a preferred embodiment of the piezoelectric ceramic array film of the present invention;

Fig. 2 is a schematic top view of the piezoelectric ceramic array film shown in Fig. 1;

3 is a schematic cross-sectional view of a partial structure of the piezoelectric ceramic array film shown in FIG. 1;

Fig. 4 is an example of the array distribution of the piezoelectric ceramic array film shown in Fig. 1;

Fig. 5 is a schematic diagram of the vibration of multiple piezoelectric vibration units of the piezoelectric ceramic array film of the present invention;

Fig. 6 is a schematic diagram of the protrusion and depression control effect of the piezoelectric ceramic array film of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a 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.

The embodiment of the utility model discloses a piezoelectric ceramic array film, please refer to Fig. 1 and Fig. 2, the thickness of the piezoelectric ceramic array film 1 is greater than or equal to 1 millimeter, and it includes a substrate 10 and a plurality of piezoelectric vibration units 11. The plurality of piezoelectric vibration units 11 are independently arranged on the base material 10 . Wherein, the base material 10 is a layer of plane material that acts as a load bearing, which can be a soft and bendable material (such as a flexible plate), or a material with a certain hardness that cannot be bent (such as a metal plate or a hard plate). plastic plane), and can also be formed by laminating multiple layers of materials.

The plurality of piezoelectric vibration units 11 are distributed in an array on the surface of the substrate 10 , and the shape of each piezoelectric vibration unit 11 may be a rectangle, a circle, a triangle, a trapezoid or other suitable polygons. Each of the piezoelectric vibration units 11 includes a piezoelectric ceramic layer 12 and at least one pair of electrode layers 13 , and the piezoelectric ceramic layer 12 is sandwiched between the at least one pair of electrode layers 13 . Wherein, the piezoelectric ceramic layer 12 may be composed of multilayer piezoelectric ceramics. Of course, the material of the piezoelectric ceramic layer 12 is not limited to piezoelectric ceramics, and may also be other suitable piezoelectric materials. Please refer to Fig. 3, each of the piezoelectric vibration units 11 has a certain physical independence, and the adjacent piezoelectric vibration units 11 are filled with air or some kind of dielectric material 14 to adjust the piezoelectric ceramic array Bulk vibration properties of membrane 1. In this embodiment, the area of each piezoelectric vibration unit 11 is less than or equal to 0.25 square centimeters, that is, the size of each piezoelectric vibration unit 11 is so small that during each touch , the user can touch multiple piezoelectric vibration units 11 at the same time.

Further, please refer to FIG. 3 , the piezoelectric ceramic array film 1 may also include a protective layer 15 and a filling medium 14, and the piezoelectric vibration unit 11 and the filling medium 14 are located between the substrate 10 and the filling medium 14. Between the protective layers 15. Both the protective layer 15 and the base material 10 may be tough materials, and the materials of the two may even be the same.

Each of the piezoelectric vibration units 11 includes a driving signal line 16 and a welding point 17, the welding point 17 is welded to the electrode layer 13, the driving signal line 16 is connected to the welding point 17, and each of the The piezoelectric vibrating units 11 are relatively independent, but the driving signal lines 16 that provide driving signals to them can be connected to each other in some form.

The driving signal of the driving signal line 16 is provided by a signal generation module (not shown in the figure), and the driving signal drives the piezoelectric vibration unit 11 through a power amplifier module (not shown in the figure). Wherein, the driving signals received by each of the piezoelectric vibration units 11 at the same time may be the same or different. When each of the piezoelectric vibration units 11 receives different driving signals at the same time, they will generate various motions according to their respective driving signals, thereby providing abundant control modes. The piezoelectric ceramic array is illustrated below with an example Multiple control modes for film 1.

Control Mode 1: When the input drive signal is an AC signal, since each piezoelectric vibration unit 11 is constantly bending and changing, it generates vibration, and the frequency of its vibration is related to the frequency of the input signal, and the amplitude of the vibration is determined by the signal The amplitude is determined by the amplitude, and multiple adjacent piezoelectric vibration units 11 can also increase the amplitude by giving the same AC signal at the same time. This control mode can be used to generate virtual haptics (Haptics).

Control Mode 2: When the input drive signal is a DC signal, if the piezoelectric vibration unit 11 can bend bidirectionally from a free state, then a stable protrusion and depression effect on a free plane can be achieved; if the piezoelectric vibration unit 11 can only With one-way bending, only one of the effects of protrusion and depression can be stably achieved. Increasing the magnitude of the DC signal increases the relative displacement of the bumps and dips. In addition, multiple adjacent piezoelectric vibration units 11 can also increase the relative displacement by giving the same DC signal at the same time. This mode of control can also be used to generate virtual haptics.

Control Mode 3: While the piezoelectric ceramic array film 1 is deformed due to the inverse piezoelectric effect, the piezoelectric ceramic array film 1 also has a piezoelectric effect, which deforms under the action of an external force, and then generates an electrical signal. The signal generated by the piezoelectric vibration unit 11 can reflect the pressure received by different positions, and at the same time, the pressure signal of multiple points can be collected (the upper limit of the number of points is the same as the number of the piezoelectric vibration unit 11), and the generated pressure signal can be analyzed Various complex control signals can be generated. This control mode can be used for functions such as touch control, handwriting control and virtual keys.

Control Mode 4: The piezoelectric ceramic array film 1 can be equivalent to an ultrasonic parameter array that can radiate ultrasonic waves. If the input ultrasonic signal is processed and then sent out by the piezoelectric ceramic array film 1, since the ultrasonic The non-linear effect in the medium can demodulate the signal audible to the human ear, and due to the characteristics of ultrasound, the propagation of this signal in the air has extremely strong directivity (strong privacy) and extremely long propagation distance (low energy attenuation).

Please refer to Fig. 4, when the vibration mode is distributed in an array in the manner shown in Fig. 4, the regions A and B each contain at least one piezoelectric vibration unit, and when the piezoelectric vibration unit in the region A vibrates at the first frequency At the same time, the piezoelectric vibration units in the area B vibrate at the second frequency, and the piezoelectric vibration units in the area C except for the area A and the area B are all stationary. At this time, touching area A, area B, and area C can experience different vibration sensations at the same time.

Please refer to Figure 5. The left part of Figure 5 is the area division diagram, and the right part is the time-amplitude schematic diagram. Taking the piezoelectric vibration unit as a circle as an example, A', B', and C' are three radii that increase in turn The input signal of the piezoelectric vibration unit in A' is ①, the input signal of the piezoelectric vibration unit in B' is ②, and the input signal of the piezoelectric vibration unit in C' is ③. The three input signals have the same amplitude but are sequentially out of phase by 90°. In this driving mode, A', B' and C' together form a wave-like vibration mode.

Please refer to Fig. 6 again. The left part in Fig. 6 is a schematic diagram of the piezoelectric vibration unit arrangement, and the right part is a time-amplitude schematic diagram. Taking the piezoelectric vibration unit as a circle as an example, a part of the piezoelectric vibration unit A" is input DC signal ①', and another part of the piezoelectric vibration unit 11B" is input with DC signal ②'. A "displaces a certain distance from the equilibrium position, and B " displaces a certain distance from the equilibrium position in the opposite direction to A ". Both A " and B " remain at their respective offset positions, and the piezoelectric ceramic array film 1 produces alternating protrusions and depressions. If more complex processing is performed on the signal amplitudes of the protrusions and depressions and the position of the piezoelectric vibration unit, the sensations experienced will produce many different changes.

In summary, the piezoelectric ceramic array film of the present invention adopts independent piezoelectric vibration units, which can realize diversified control modes, realize complex functions, provide complex feedback signals, and solve Calls up an audible signal audible to the human ear.

The above descriptions are only examples of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the utility model description, or directly or indirectly used in other related technologies Fields are all included in the scope of patent protection of the utility model in the same way.

Claims (10)

1. A piezoelectric ceramic array film, characterized in that it comprises a base material and a plurality of piezoelectric vibration units, the plurality of piezoelectric vibration units are independently arranged on the base material, each of the piezoelectric The vibration unit includes a piezoelectric ceramic layer and at least one pair of electrode layers, and the piezoelectric ceramic layer is interposed between the at least one pair of electrode layers. 2 . The piezoelectric ceramic array film according to claim 1 , wherein the driving signals received by each of the piezoelectric vibration units at the same time are the same or different. 3 . The piezoelectric ceramic array film according to claim 1 , wherein the piezoelectric ceramic array film comprises a protective layer, and the piezoelectric vibration unit is located between the substrate and the protective layer. 4 . 4 . The piezoelectric ceramic array thin film according to claim 3 , wherein both the substrate and the protective layer are tough materials. 5 . The piezoelectric ceramic array thin film according to claim 3 , wherein the piezoelectric ceramic array thin film comprises a filling medium, and the filling medium is located between the base material and the protective layer. 6. The piezoelectric ceramic array film according to claim 1, wherein each piezoelectric vibration unit includes a driving signal line and a welding point, the welding point is welded to the electrode layer, and the driving signal Wires are connected to the pads. 7. The piezoelectric ceramic array film according to claim 1, wherein the plurality of piezoelectric vibration units are distributed in an array on the surface of the substrate. 8 . The piezoelectric ceramic array film according to claim 1 , wherein the area of each piezoelectric vibration unit is less than or equal to 0.25 square centimeters. 9 . The piezoelectric ceramic array thin film according to claim 1 , wherein the piezoelectric vibration unit is rectangular, circular, triangular or trapezoidal. 10. The piezoelectric ceramic array thin film according to claim 1, characterized in that the thickness of the piezoelectric ceramic array thin film is greater than or equal to 1 mm.

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