CN113179094B - Capacitive piezoelectric touch virtual key and design method thereof - Google Patents
Capacitive piezoelectric touch virtual key and design method thereof Download PDFInfo
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- CN113179094B CN113179094B CN202110401976.XA CN202110401976A CN113179094B CN 113179094 B CN113179094 B CN 113179094B CN 202110401976 A CN202110401976 A CN 202110401976A CN 113179094 B CN113179094 B CN 113179094B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000919 ceramic Substances 0.000 claims abstract description 64
- 230000000694 effects Effects 0.000 claims description 8
- 230000033001 locomotion Effects 0.000 claims description 8
- 239000004020 conductor Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000003306 harvesting Methods 0.000 claims description 3
- 230000005764 inhibitory process Effects 0.000 claims description 3
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 4
- 230000000007 visual effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/964—Piezoelectric touch switches
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Abstract
The invention relates to the technical field of virtual keys, in particular to a capacitive piezoelectric touch virtual key and a design method thereof, wherein a virtual key touch area is set on a dielectric layer through at least two rivets, a touch capacitance electrode is arranged on the upper surface of the dielectric layer in the virtual key touch area, the touch capacitance electrode is connected with the input end of a control circuit, a plurality of piezoelectric driving ceramic plates are arranged on the touch capacitance electrode and connected with the output end of the control circuit, a plurality of piezoelectric energy collecting ceramic plates are arranged on the touch capacitance electrode, and the piezoelectric energy collecting ceramic plates are connected with the input end of the control circuit; the invention simplifies the design of the mobile phone key, ensures that the surface exposed outside has no protrusion and design, avoids the defect of poor reliability of the traditional mechanical key, and has low cost, low power consumption, visual and convenient use and simple and convenient structure.
Description
Technical Field
The invention relates to the technical field of virtual keys, in particular to a capacitive piezoelectric touch virtual key and a design method thereof.
Background
The touch key design of the existing mobile equipment adopts mechanical or plastic keys all the time, the keys of the type need physical electric contact to realize key functions, and the mechanical moving part is an indispensable part of the keys of the type; because of the physical contact and mechanical movement required, the type of keys has poor reliability and high accident rate. In addition, due to the addition of the touch keys, the mobile device generates concave-convex feeling when the fingers slide to touch the keys, so that the touch position is determined, and the design of the protective shell is contrary to that of the existing protective shell.
In recent years, with the development of intelligent devices, touch screen keys have been widely used, and the type of keys have key functions in a part of a display area, and do not need mechanical moving parts to realize the key functions, so that the reliability of the keys is greatly improved, and the available display area of a mobile phone is maximally used, so that the mobile phone is not only used for display, but also used for recognition related to keys, handwriting and other strokes. However, the mobile phone key realized by the method has high cost, high power consumption and short usable time after the mobile phone is charged; the touch screen is not as intuitive, simple and convenient as a traditional keyboard, and the function of keys can be invalid when the touch screen is damaged; thus, a significant portion of smart devices still employ conventional mechanical keys.
Disclosure of Invention
Aiming at the defects, the invention adopts the piezoelectric ceramic plate as the piezoelectric component, realizes the vibration touch sense positioning key position and volume adjusting function through the positive and negative piezoelectric effects of the piezoelectric ceramic, simplifies the design of the mobile phone key, ensures that the surface exposed outside has no bulge and design, avoids the defect of poor reliability of the traditional mechanical key, and has low cost, small power consumption, visual and convenient use and simple and convenient structure.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a virtual button of capacitive piezoelectric touch, set for virtual button touch region (2) through two at least rivets (3) on dielectric layer (1), dielectric layer (1) upper surface in virtual button touch region (2) sets up touch capacitance electrode (4), touch capacitance electrode (4) are connected with control circuit input, set up a plurality of piezoelectricity drive potsherd (5) on touch capacitance electrode (4), piezoelectricity drive potsherd (5) are connected with the control circuit output, set up a plurality of piezoelectricity energy collection potsherd (6) on touch capacitance electrode (4), piezoelectricity energy collection potsherd (6) are connected with control circuit's input.
The technical scheme of the invention is further improved as follows: the piezoelectric driving ceramic piece (5) is of an inverse piezoelectric effect, a user abuts against the virtual key touch area (2), the touch capacitance electrode (4) receives signals and transmits the signals to the input end of the control circuit, the output end of the control circuit transmits signals to the piezoelectric driving ceramic piece (5), the piezoelectric driving ceramic piece (5) vibrates, the virtual key touch area (2) vibrates, and the abutting part of the user generates touch sense.
The technical scheme of the invention is further improved as follows: the virtual key touch area (2) is provided with at least two piezoelectric driving ceramic plates (5), the two piezoelectric driving ceramic plates (5) of the virtual key touch area (2) form resonance modes with the same frequency and the same shape, pi/2 difference in space and time is achieved, a traveling wave is formed on the virtual key touch area (2), the traveling wave is an elastomer motion wave, when a user abutting part moves in the virtual key touch area (2), and the traveling wave motion directions are consistent or opposite, the user experiences are different.
The technical scheme of the invention is further improved as follows: when the virtual key touch area (2) slides along different directions, a user can generate different inhibition effects on the traveling wave, so that the vibration of the virtual key touch area (2) is different, and the signals collected by the piezoelectric energy collection ceramic plate (6) are different, so that the volume is adjusted.
5. The design method of the capacitive piezoelectric touch virtual key is characterized by comprising the following steps of:
1) Selecting the position, shape and size of the virtual key touch area (2) on the mobile device according to the use habit of the user;
2) Selecting a dielectric layer (1) as a dielectric layer of a virtual key touch area (2), selecting a conductive material as a touch capacitance electrode (4), and selecting a piezoelectric ceramic material as a piezoelectric driving ceramic sheet (5) and a piezoelectric energy collecting ceramic sheet (6);
3) Connecting a capacitance electrode corresponding to the virtual key touch area (2) to a corresponding input channel of a control circuit of the virtual key touch area (2);
4) Connecting piezoelectric driving ceramic plates (6) forming vibration touch sense of the virtual key touch area (2) to corresponding output channels of a control circuit;
5) The piezoelectric energy harvesting ceramic sheet (6) in the virtual key touch area (2) is connected to a corresponding input channel of the control circuit.
The technical scheme of the invention is further improved as follows: in the step 2), the dielectric layer (1) is any one of an organic glass dielectric layer, an acrylic dielectric layer and a metal dielectric layer.
The technical scheme of the invention is further improved as follows: in the step 2), the conductive material ITO is a touch capacitance electrode (4), and the piezoelectric ceramic material PZT-5 piezoelectric ceramic plate is used as a piezoelectric driving ceramic plate (5) and a piezoelectric energy collecting ceramic plate (6).
Compared with the prior art, the capacitive piezoelectric touch virtual key and the design method thereof have the beneficial effects that:
1. The invention provides a capacitive piezoelectric touch virtual key and a design method thereof, wherein the capacitive piezoelectric touch virtual key mainly comprises a dielectric layer, a piezoelectric ceramic plate, a touch capacitance electrode and a control circuit, wherein the touch capacitance electrode can be directly sprayed or printed on the dielectric by using any conductive material or is arranged below the dielectric layer by using a printed PCB (printed circuit board), the piezoelectric ceramic plate is adhered below the dielectric layer of a virtual key touch area, so that the piezoelectric ceramic plate is exposed on the outer surface without any protrusion and design, the defect of poor reliability of the traditional mechanical key is avoided, and the advantages of low cost, low power consumption, visual and convenient use and simple and convenient structure are reserved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a capacitive piezoelectric touch virtual key for a side frame structure of an intelligent device;
FIG. 2 is a schematic diagram of a capacitive piezoelectric haptic virtual key region of FIG. 1;
FIG. 3 is a schematic diagram of the wiring of piezoelectric driving ceramic plates and piezoelectric energy collecting ceramic plates in a capacitive piezoelectric touch virtual key according to the present invention;
Fig. 4 is a schematic diagram of a piezoelectric mode stack to generate a traveling wave.
Reference numerals in the drawings: 1-a dielectric layer; 2-a virtual key area; 3-rivets; 4-touching the capacitive electrode; 5-piezoelectrically driving the ceramic wafer; 6-piezoelectric energy harvesting ceramic wafer.
Detailed Description
The technical scheme of the present invention will be clearly and completely described in the following detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-4, the capacitive piezoelectric touch virtual key is provided with a dielectric layer 1, a mobile phone frame, a piezoelectric driving ceramic piece 5, a piezoelectric energy collecting ceramic piece 6, a touch capacitive electrode 4 and a control circuit, wherein the touch capacitive electrode 4 is arranged in a capacitive piezoelectric touch virtual key area 2, the capacitive piezoelectric touch virtual key area 2 is fixed by two rivets 3, the piezoelectric driving ceramic piece 5 is arranged on the touch capacitive electrode 4, the piezoelectric energy collecting ceramic piece 6 is adhered to the touch capacitive electrode 4, the touch capacitive electrode 4 is connected with the input end of the control circuit, and the piezoelectric driving ceramic piece 5 and the piezoelectric energy collecting ceramic piece 6 are connected with the output end of the collection control circuit; preferably, the dielectric layer 1 is any one of an organic glass dielectric layer, an acrylic dielectric layer and a metal dielectric layer; furthermore, the conductive material ITO is a touch capacitance electrode (4), and the piezoelectric ceramic material PZT-5 piezoelectric ceramic sheet is used as a piezoelectric driving ceramic sheet (5) and a piezoelectric energy collecting ceramic sheet (6).
The capacitive piezoelectric tactile virtual key area 2 designed in the embodiment is a two-end fixed beam structure, the dielectric layer 1 is partially fixed by the rivet 3, when a user touches the capacitive piezoelectric tactile virtual key area 2, the touch capacitive electrode 4 generates a signal to an input channel of a control circuit and transmits an electric signal to the piezoelectric driving ceramic piece 5 from an output channel, so that the piezoelectric driving ceramic piece 5 vibrates, and the capacitive piezoelectric tactile feedback virtual key area 2 is driven to vibrate, and the piezoelectric energy collecting piezoelectric piece 6 is driven to vibrate due to the vibration generated by touching the key area 2; further, the design structure is obtained by combining relevant knowledge of vibration mechanics and elastic mechanics with ANSYS and other engineering software simulation calculation analysis, firstly, the medium layer 1 and the mobile phone frame material are determined, basic parameters such as elastic modulus, density, size and piezoelectric constant of the material are obtained, then the inherent characteristics of the fixed beams at the two ends are calculated, and the bonding position of the piezoelectric driving ceramic sheet 5 is determined by combining the simulation analysis result of the engineering software, so that the piezoelectric driving ceramic sheet 5 is finally positioned at the peak and trough of the inherent vibration mode of the fixed beams at the two ends when exciting; the two piezoelectric driving ceramic plates 5 are arranged in the capacitive piezoelectric tactile feedback virtual key area 2, and the same-frequency and same-shape resonance modes (standing waves) excited by the two piezoelectric driving ceramic plates 5 in the capacitive piezoelectric tactile feedback virtual key area 2 are different by pi/2 in space and time by combining the knowledge of wave superposition analysis and the like, wherein pi/2 in space is the excitation position phase difference lambda/4 of the two piezoelectric driving ceramic plates 5 in the virtual key area 2, lambda is the wavelength, pi/2 in time is the time phase difference 1/4 period, so that the capacitive piezoelectric tactile feedback virtual key area 2 can generate travelling waves; the traveling wave is a wave moving in an elastic body, and when a user's finger contacts in the capacitive piezoelectric tactile feedback virtual key region 2, a piezoelectric vibration touch feeling is generated, and when the touch movement of the user's finger coincides with the direction of the generated traveling wave movement, the touch feeling is different from that generated when the touch movement of the user's finger is opposite. When a finger slides in the virtual key area 2, the piezoelectric energy collecting ceramic plate 6 applies positive piezoelectric effect, and the finger slides along the traveling wave transmission direction and against the traveling wave transmission direction to cause different vibration inhibition, so that electric signals generated by different energies collected by the piezoelectric energy collecting ceramic plate 6 are different, and the generated energies are transmitted to the control circuit, so that volume adjustment is performed.
The invention adopts the capacitive piezoelectric tactile virtual key to replace the mechanical key, the principle of the capacitive piezoelectric tactile virtual key is that the corresponding capacitance value of the touched position is changed by touching the finger of a user, the capacitance change is detected by a control circuit of the capacitive piezoelectric tactile virtual key, and an electric signal is input to a piezoelectric driving ceramic plate at the position of the virtual key by an output circuit of the control circuit, so that the virtual key position has inverse piezoelectric effect to generate vibration touch. According to the invention, the two piezoelectric driving ceramic plates are adopted to generate traveling waves at the virtual key positions, so that vibration touch sense generated when a user slides upwards to touch is different from vibration touch sense generated when the user slides downwards to touch; when the finger of the user slides along the traveling wave transmission direction and against the traveling wave transmission direction, different vibration suppression is caused, and different vibration signals are collected by the piezoelectric energy collecting piezoelectric plate by the positive piezoelectric effect, so that output electric signals generated by different collected energies are different, and the different electric signals are transmitted to the control circuit, so that the volume of the mobile phone is adjusted.
The above embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. The utility model provides a virtual button of capacitive piezoelectric touch which characterized in that: the device comprises a virtual key touch area (2) arranged on a dielectric layer (1) through at least two rivets (3), wherein the virtual key touch area (2) is of a two-end fixed beam structure, a touch capacitance electrode (4) is arranged on the upper surface of the dielectric layer (1) in the virtual key touch area (2), the touch capacitance electrode (4) is connected with the input end of a control circuit, a plurality of piezoelectric driving ceramic plates (5) are arranged on the touch capacitance electrode (4), the piezoelectric driving ceramic plates (5) are connected with the output end of the control circuit, a plurality of piezoelectric energy collecting ceramic plates (6) are arranged on the touch capacitance electrode (4), and the piezoelectric energy collecting ceramic plates (6) are connected with the input end of the control circuit; the piezoelectric driving ceramic piece (5) is of an inverse piezoelectric effect, a user abuts against the virtual key touch area (2), the touch capacitance electrode (4) receives signals and transmits the signals to the input end of the control circuit, the output end of the control circuit transmits the signals to the piezoelectric driving ceramic piece (5), the piezoelectric driving ceramic piece (5) vibrates, the virtual key touch area (2) vibrates, and the abutting part of the user generates touch sense; the virtual key touch area (2) is provided with at least two piezoelectric driving ceramic plates (5), the piezoelectric driving ceramic plates (5) are positioned at wave crests and wave troughs of the natural vibration modes of the fixed beams at the two ends, the two piezoelectric driving ceramic plates (5) of the virtual key touch area (2) form resonance modes with the same frequency and the same shape, pi/2 difference in space and time is achieved, a traveling wave is formed on the virtual key touch area (2), the traveling wave is an elastomer motion wave, and when a user abutting part moves in the virtual key touch area (2), the traveling wave motion directions are consistent or opposite, the user experiences are different; when the virtual key touch area (2) slides along different directions, a user can generate different inhibition effects on the traveling wave, so that the vibration of the virtual key touch area (2) is different, and the signals collected by the piezoelectric energy collection ceramic plate (6) are different, so that the volume is adjusted.
2. A capacitive piezoelectric touch virtual key design method, comprising the capacitive piezoelectric touch virtual key of claim 1 and comprising the steps of:
1) Selecting the position, shape and size of the virtual key touch area (2) on the mobile device according to the use habit of the user;
2) Selecting a dielectric layer (1) as a dielectric layer of a virtual key touch area (2), selecting a conductive material as a touch capacitance electrode (4), and selecting a piezoelectric ceramic material as a piezoelectric driving ceramic sheet (5) and a piezoelectric energy collecting ceramic sheet (6); the pasting position of the piezoelectric driving ceramic piece (5) is obtained through the simulation calculation analysis of vibration mechanics and elastic mechanics knowledge combined with ANSYS engineering software;
3) Connecting a capacitance electrode corresponding to the virtual key touch area (2) to a corresponding input channel of a control circuit of the virtual key touch area (2);
4) Connecting piezoelectric driving ceramic plates (5) forming vibration touch sense of the virtual key touch area (2) to corresponding output channels of a control circuit;
5) The piezoelectric energy harvesting ceramic sheet (6) in the virtual key touch area (2) is connected to a corresponding input channel of the control circuit.
3. The method for designing the capacitive piezoelectric touch virtual key according to claim 2, wherein the method comprises the following steps of: in the step 2), the dielectric layer (1) is any one of an organic glass dielectric layer, an acrylic dielectric layer and a metal dielectric layer.
4. The method for designing the capacitive piezoelectric touch virtual key according to claim 2, wherein the method comprises the following steps of: in the step 2), the conductive material ITO is a touch capacitance electrode (4), and the piezoelectric ceramic material PZT-5 piezoelectric ceramic plate is used as a piezoelectric driving ceramic plate (5) and a piezoelectric energy collecting ceramic plate (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110401976.XA CN113179094B (en) | 2021-04-14 | 2021-04-14 | Capacitive piezoelectric touch virtual key and design method thereof |
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| CN202110401976.XA CN113179094B (en) | 2021-04-14 | 2021-04-14 | Capacitive piezoelectric touch virtual key and design method thereof |
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| CN113179094A CN113179094A (en) | 2021-07-27 |
| CN113179094B true CN113179094B (en) | 2024-05-17 |
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| CN114428551B (en) * | 2021-12-29 | 2024-02-06 | 南京信息工程大学 | Device for generating local vibration on touch screen and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338033A (en) * | 2013-06-05 | 2013-10-02 | 海芯科技(厦门)有限公司 | Capacitance-type touch keys applied to cell phones and a design method thereof |
| CN106775051A (en) * | 2016-11-15 | 2017-05-31 | 深圳天珑无线科技有限公司 | A kind of pressure sensitivity contact panel and pressure sensitivity contactor control device |
| CN110347249A (en) * | 2019-06-25 | 2019-10-18 | 燕山大学 | Based on modes superposition tactile feedback method |
| WO2019206280A1 (en) * | 2018-04-28 | 2019-10-31 | 北京钛方科技有限责任公司 | Control method for virtual keyboard |
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- 2021-04-14 CN CN202110401976.XA patent/CN113179094B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103338033A (en) * | 2013-06-05 | 2013-10-02 | 海芯科技(厦门)有限公司 | Capacitance-type touch keys applied to cell phones and a design method thereof |
| CN106775051A (en) * | 2016-11-15 | 2017-05-31 | 深圳天珑无线科技有限公司 | A kind of pressure sensitivity contact panel and pressure sensitivity contactor control device |
| WO2019206280A1 (en) * | 2018-04-28 | 2019-10-31 | 北京钛方科技有限责任公司 | Control method for virtual keyboard |
| CN110347249A (en) * | 2019-06-25 | 2019-10-18 | 燕山大学 | Based on modes superposition tactile feedback method |
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