Piezoelectric thin film array shell key

Abstract

The utility model discloses a piezoelectric film array watch case button, watch case button includes inner shell, shell and a plurality of piezoelectric film, the shell is equipped with in the lateral wall of inner shell, a plurality of piezoelectric film sets up between the inner shell and the shell, a plurality of piezoelectric film sets up in the one side of inner shell, and a plurality of piezoelectric film array arrangement, the inner shell is provided with the board card, and piezoelectric film all is connected with the board card communication through signal acquisition circuit, a plurality of piezoelectric film array arrangement in the utility model embodiment, through the signal trigger timing of different piezoelectric film and combination, can accurate identification point press, double -click, up and down sliding operation, a plurality of piezoelectric film sets up between the inner shell and the shell, and there is no gap between the inner shell and the shell, and the overall waterproof performance of watch case button is improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of button technology, and in particular to a piezoelectric thin film array watch case button. Background Technology

[0002] With the development of smartwatches, their functions are becoming increasingly diverse, and people have higher and higher requirements for convenient operation and water resistance. Traditional watches all have physical buttons, but these buttons need to move, creating gaps between them and the case, making water resistance difficult. Furthermore, physical buttons only have a single-click function, which is relatively limited. Therefore, existing buttons suffer from the problem of limited functionality. Utility Model Content

[0003] This invention provides a piezoelectric thin film array watch case button, which aims to solve the problem of existing buttons having limited functionality.

[0004] To solve the above-mentioned technical problems, this utility model provides a piezoelectric thin film array watch case button. The watch case button includes an inner shell, an outer shell, and multiple piezoelectric thin films. The outer shell is sleeved on the outer side wall of the inner shell, and the multiple piezoelectric thin films are disposed between the inner shell and the outer shell.

[0005] Multiple piezoelectric films are disposed on one side of the inner shell, and the multiple piezoelectric films are arranged in an array.

[0006] The inner shell contains a circuit board, and the piezoelectric films are all connected to the circuit board via a signal acquisition circuit.

[0007] Furthermore, a first button area is provided on one side of the inner shell, and the piezoelectric film is adhered to the first button area.

[0008] Furthermore, a second button area is provided on one side of the outer casing, and the second button area corresponds to the first button area.

[0009] Furthermore, the signal acquisition circuit includes a high-pass amplifier module, a low-pass filter module, a comparator module, and a control chip;

[0010] The signal output by the piezoelectric film is processed sequentially by the high-pass amplifier module, the low-pass filter module, and the comparator module, and finally outputs a digital signal to the control chip.

[0011] Furthermore, the high-pass amplifier module includes a second capacitor, a third capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a ninth resistor, and a first operational amplifier;

[0012] The signal output terminal of the piezoelectric film is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the first terminal of the third resistor, the second terminal of the third resistor is simultaneously connected to the inverting input terminal of the first operational amplifier, the first terminal of the fifth capacitor and the first terminal of the ninth resistor, and the second terminal of the fifth capacitor and the second terminal of the ninth resistor are simultaneously connected to the output terminal of the first operational amplifier. The connection point serves as the first signal output terminal of the high-pass amplifier module.

[0013] The first end of the second capacitor is connected to the first end of the second resistor, and the connection point is grounded. The second end of the second capacitor, the second end of the second resistor, and the second end of the first resistor are all connected to the non-inverting input of the first operational amplifier. The first end of the first resistor is connected to the power supply.

[0014] Furthermore, the low-pass filter module includes a first capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a seventh resistor, a tenth resistor, and a second operational amplifier;

[0015] The first end of the fourth resistor is connected to the first signal output terminal, the second end of the fourth resistor is connected to the first end of the fifth resistor, and its connection point is connected to the first end of the first capacitor. The second end of the first capacitor is simultaneously connected to the output terminal of the second operational amplifier and the second end of the seventh resistor, and its connection point serves as the second signal output terminal of the low-pass filter module.

[0016] The first end of the seventh resistor is connected to both the non-inverting input of the second operational amplifier and the first end of the tenth resistor, and the second end of the tenth resistor is grounded; the second end of the fifth resistor is connected to both the first end of the fourth capacitor and the inverting input of the second operational amplifier, and the second end of the fourth capacitor is grounded.

[0017] Furthermore, the comparator module includes a sixth resistor, an eighth resistor, and a third operational amplifier. The first end of the sixth resistor is connected to the power supply terminal, and the second end of the sixth resistor is connected to both the first end of the eighth resistor and the inverting input terminal of the third operational amplifier. The second end of the eighth resistor is grounded.

[0018] The second signal output terminal is connected to the non-inverting input terminal of the third operational amplifier, and the output terminal of the third operational amplifier is connected to the control chip.

[0019] Furthermore, the piezoelectric film is connected to the board via LDS circuitry.

[0020] Furthermore, the board is connected to the LDS circuit via a spring clip.

[0021] Furthermore, the inner shell is injection molded, and the outer shell is injection molded a second time.

[0022] This utility model discloses a piezoelectric film array watch case button. The watch case button includes an inner shell, an outer shell, and multiple piezoelectric films. The outer shell is fitted onto the outer wall of the inner shell, and the multiple piezoelectric films are disposed between the inner shell and the outer shell. The multiple piezoelectric films are also disposed on one side of the inner shell, arranged in an array. A circuit board is disposed inside the inner shell, and each piezoelectric film is communicatively connected to the circuit board via a signal acquisition circuit. The array arrangement of multiple piezoelectric films in this utility model allows for precise identification of operations such as tapping, double-tapping, and sliding by using the signal triggering sequence and combination of different piezoelectric films. The multiple piezoelectric films are disposed between the inner shell and the outer shell, with no gap between them, significantly improving the overall waterproof performance of the watch case button. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a partial structural diagram of the piezoelectric thin film array watch case button provided in this embodiment of the utility model;

[0025] Figure 2 This is a structural diagram of the piezoelectric thin film array watch case button provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the signal acquisition circuit provided in an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the principle of the piezoelectric thin film array watch case button provided in this embodiment of the utility model;

[0028] The labels for the attached figures are as follows:

[0029] 1. Inner shell; 2. Outer shell; 3. Piezoelectric film; 4. Second button area; 5. LDS circuit; MCU, control chip; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, fourth capacitor; C5, fifth capacitor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; U1, first operational amplifier; U2, second operational amplifier. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0032] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0033] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] Please see Figure 1 and Figure 2 This utility model proposes a piezoelectric thin film array watch case button. The watch case button includes an inner shell 1, an outer shell 2, and multiple piezoelectric thin films 3. The outer shell 2 is sleeved on the outer side wall of the inner shell 1, and the multiple piezoelectric thin films 3 are disposed between the inner shell 1 and the outer shell 2. The multiple piezoelectric thin films 3 are disposed on one side of the inner shell 1 and are arranged in an array. A circuit board is disposed inside the inner shell 1, and the piezoelectric thin films 3 are all communicatively connected to the circuit board through a signal acquisition circuit.

[0035] In this embodiment, the watch case button includes an inner shell 1, an outer shell 2, and a plurality of piezoelectric films 3. The outer shell 2 is sleeved on the outer side wall of the inner shell 1, and the plurality of piezoelectric films 3 are disposed between the inner shell 1 and the outer shell 2. There is no gap between the inner shell 1 and the outer shell 2, which significantly improves the overall waterproof performance of the watch case button. Preferably, the inner shell 1 and the outer shell 2 are seamlessly bonded by injection molding.

[0036] Multiple piezoelectric films 3 are disposed on one side of the inner shell 1, and the multiple piezoelectric films 3 are arranged in an array. A circuit board is disposed inside the inner shell 1, and the piezoelectric films 3 are all connected to the circuit board through a signal acquisition circuit. The piezoelectric film 3 is a material that works based on the piezoelectric effect, which can convert mechanical energy into electrical energy. This solution utilizes the positive piezoelectric effect of the piezoelectric film 3. When the material is subjected to mechanical stress, the internal crystal structure deforms and generates charges. At this time, the signal acquisition circuit collects this charge change to determine the external stress change, thereby realizing the single-point pressing and sliding functions. Specifically, when the user slides on the array of piezoelectric films 3, multiple signals can be generated. By the signal triggering sequence and combination of different piezoelectric films 3, operations such as single press, double click, and up and down sliding can be accurately identified.

[0037] In one embodiment, such as Figure 1 and Figure 2 As shown, the inner shell 1 is injection molded, and the outer shell 2 is injection molded in a secondary manner.

[0038] In this embodiment, after the inner shell 1 is manufactured, multiple piezoelectric films 3 are adhered to the outer wall of the inner shell 1. After adhesion, a second injection molding process is performed to wrap the piezoelectric films 3 between the inner shell 1 and the outer shell 2. This embodiment of the invention uses an injection molding process, which significantly improves the overall waterproof performance of the watch case buttons.

[0039] In one embodiment, such as Figure 1 and Figure 2 As shown, a first button area is provided on one side of the inner shell 1, and the piezoelectric film 3 is adhered to the first button area.

[0040] In this embodiment, a first button area is pre-formed on one side of the inner shell 1, and the piezoelectric film 3 is adhered to the first button area.

[0041] In one embodiment, such as Figure 1 and Figure 2 As shown, a second button area 4 is provided on one side of the outer casing 2, and the second button area 4 corresponds to the first button area.

[0042] In this embodiment, a second button area 4 is provided on one side of the outer shell 2. The second button area 4 corresponds to the first button area. When in use, pressing or sliding on the second button area 4 can realize the human-computer interaction function.

[0043] In one embodiment, such as Figure 3As shown, the signal acquisition circuit includes a high-pass amplifier module, a low-pass filter module, a comparator module, and a control chip MCU; the signal output by the piezoelectric film 3 is processed sequentially by the high-pass amplifier module, the low-pass filter module, and the comparator module, and finally outputs a digital signal to the control chip MCU.

[0044] In this embodiment, the signal acquisition circuit includes a high-pass amplifier module, a low-pass filter module, a comparator module, and a control chip MCU; the signal output by the piezoelectric film 3 is processed sequentially by the high-pass amplifier module, the low-pass filter module, and the comparator module, and finally outputs a digital signal to the control chip MCU, realizing the accurate conversion from analog signal to digital instruction.

[0045] When the user slides on the second button area 4, multiple signals are generated. The generated signals are processed sequentially by the high-pass amplification module and the low-pass filtering module to form a filtered and amplified waveform. Then, after being processed by the comparator module, a comparator waveform is formed and transmitted to the control chip MCU. The control chip MCU accurately identifies operations such as tapping, double-tapping, and sliding up and down by the triggering timing and combination of the comparator waveforms.

[0046] In one embodiment, such as Figure 1 and Figure 3 As shown, the high-pass amplifier module includes a second capacitor C2, a third capacitor C3, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a ninth resistor R9, and a first operational amplifier U1. The signal output terminal of the piezoelectric film 3 is connected to the first terminal of the third capacitor C3. The second terminal of the third capacitor C3 is connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is simultaneously connected to the inverting input terminal of the first operational amplifier U1, the first terminal of the fifth capacitor C5, and the first terminal of the ninth resistor R9. The second terminals of the fifth capacitor C5 and the ninth resistor R9 are simultaneously connected to the output terminal of the first operational amplifier U1, and their connection point serves as the first signal output terminal of the high-pass amplifier module. The first terminal of the second capacitor C2 is connected to the first terminal of the second resistor R2, and their connection point is grounded. The second terminals of the second capacitor C2, the second terminals of the second resistor R2, and the second terminals of the first resistor R1 are simultaneously connected to the non-inverting input terminal of the first operational amplifier U1. The first terminal of the first resistor R1 is connected to the power supply terminal.

[0047] In this embodiment, the high-pass amplification module utilizes the high-pass filtering characteristics to allow high-frequency signals (such as feature signals from button sliding and pressing) generated by the piezoelectric film 3 to pass through and be amplified smoothly, while suppressing low-frequency interference and amplifying the weak piezoelectric signals to a suitable amplitude for convenient subsequent processing.

[0048] In this embodiment of the invention, to simplify the system power supply design, a single power supply scheme is adopted. A voltage divider circuit composed of a first resistor R1 and a second resistor R2 provides a DC bias voltage to the first operational amplifier U1. After the bias voltage is superimposed on the signal output by the piezoelectric film 3, it ensures that the signal is in the effective amplification range of the operational amplifier throughout the entire process, avoiding waveform distortion under single power supply and ensuring the integrity of signal acquisition. The high-pass cutoff frequency of the first operational amplifier U1 is determined by the formula f = 1 / 2πR9C3, and the specific amplification factor is -R9 / R3, which can accurately filter out low-frequency interference and realize signal gain adjustment.

[0049] In one embodiment, such as Figure 3 As shown, the low-pass filter module includes a first capacitor C1, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, a tenth resistor R10, and a second operational amplifier U2. The first end of the fourth resistor R4 is connected to the first signal output terminal, and the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5. Their connection point is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is simultaneously connected to the output terminal of the second operational amplifier U2 and the second end of the seventh resistor R7, with this connection point serving as the second signal output terminal of the low-pass filter module. The first end of the seventh resistor R7 is simultaneously connected to the non-inverting input terminal of the second operational amplifier U2 and the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is grounded. The second end of the fifth resistor R5 is simultaneously connected to the first end of the fourth capacitor C4 and the inverting input terminal of the second operational amplifier U2, and the second end of the fourth capacitor C4 is grounded.

[0050] In this embodiment, the low-pass filter module is used to filter out high-frequency noise mixed in after the signal is amplified and processed, making the signal waveform purer and more regular, ensuring that the signal transmitted to the subsequent modules meets the requirements, and making the subsequent recognition of button operations (click, slide, etc.) more accurate.

[0051] Specifically, R4 = R5, C1 = C4, the low-pass cutoff frequency of U2 is 1 / 2πR4C1, and the amplification factor is 1 + R7 / R10.

[0052] In one embodiment, such as Figure 3 As shown, the comparator module includes a sixth resistor R6, an eighth resistor R8, and a third operational amplifier U3. The first end of the sixth resistor R6 is connected to the power supply terminal, and the second end of the sixth resistor R6 is connected to both the first end of the eighth resistor R8 and the inverting input terminal of the third operational amplifier U3. The second end of the eighth resistor R8 is grounded. The second signal output terminal is connected to the non-inverting input terminal of the third operational amplifier U3, and the output terminal of the third operational amplifier U3 is connected to the control chip MCU.

[0053] In this embodiment, the comparator module compares the filtered and amplified analog signal with a preset reference voltage. When the input signal voltage is higher than the reference voltage, it outputs a stable state (e.g., high level); when it is lower than the reference voltage, it outputs another state (e.g., low level), converting the analog signal into a digital signal. This allows the control chip (MCU) to identify specific button operations based on the changes in high and low levels, thus parsing the button interaction commands. Specifically, the reference voltage (comparison voltage) is set using resistors R6 and R8, where reference voltage = R8 / (R6+R8).

[0054] In one embodiment, such as Figure 1 and Figure 2 As shown, the piezoelectric film 3 is connected to the board via LDS line 5.

[0055] In this embodiment, the piezoelectric film 3 is electrically connected to the board via the LDS line 5.

[0056] In one embodiment, such as Figure 2 As shown, the board is connected to the LDS line 5 via a spring clip.

[0057] In this embodiment, the board is connected to the LDS line 5 via a spring contact to realize signal acquisition of the piezoelectric film 3.

[0058] This utility model discloses a piezoelectric film array watch case button. The watch case button includes an inner shell, an outer shell, and multiple piezoelectric films. The outer shell is fitted onto the outer wall of the inner shell, and the multiple piezoelectric films are disposed between the inner shell and the outer shell. The multiple piezoelectric films are also disposed on one side of the inner shell, arranged in an array. A circuit board is disposed inside the inner shell, and each piezoelectric film is communicatively connected to the circuit board via a signal acquisition circuit. The array arrangement of multiple piezoelectric films in this utility model allows for precise identification of operations such as tapping, double-tapping, and sliding by using the signal triggering sequence and combination of different piezoelectric films. The multiple piezoelectric films are disposed between the inner shell and the outer shell, with no gap between them, significantly improving the overall waterproof performance of the watch case button.

[0059] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A piezoelectric thin film array shell key, characterized by, The watch case button includes an inner shell, an outer shell, and multiple piezoelectric films. The outer shell is sleeved on the outer side wall of the inner shell, and the multiple piezoelectric films are disposed between the inner shell and the outer shell. Multiple piezoelectric films are disposed on one side of the inner shell, and the multiple piezoelectric films are arranged in an array. The inner shell contains a circuit board, and the piezoelectric films are all connected to the circuit board via a signal acquisition circuit.

2. The piezoelectric thin film array shell key according to claim 1, wherein A first button area is provided on one side of the inner shell, and the piezoelectric film is adhered to the first button area.

3. The piezoelectric thin film array watch case button according to claim 2, characterized in that, A second button area is provided on one side of the housing, and the second button area corresponds to the first button area.

4. The piezoelectric thin film array watch case button according to claim 1, characterized in that, The signal acquisition circuit includes a high-pass amplifier module, a low-pass filter module, a comparator module, and a control chip; The signal output by the piezoelectric film is processed sequentially by the high-pass amplifier module, the low-pass filter module, and the comparator module, and finally outputs a digital signal to the control chip.

5. The piezoelectric thin film array watch case button according to claim 4, characterized in that, The high-pass amplifier module includes a second capacitor, a third capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a ninth resistor, and a first operational amplifier; The signal output terminal of the piezoelectric film is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the first terminal of the third resistor, the second terminal of the third resistor is simultaneously connected to the inverting input terminal of the first operational amplifier, the first terminal of the fifth capacitor and the first terminal of the ninth resistor, and the second terminal of the fifth capacitor and the second terminal of the ninth resistor are simultaneously connected to the output terminal of the first operational amplifier. The connection point serves as the first signal output terminal of the high-pass amplifier module. The first end of the second capacitor is connected to the first end of the second resistor, and the connection point is grounded. The second end of the second capacitor, the second end of the second resistor, and the second end of the first resistor are all connected to the non-inverting input of the first operational amplifier. The first end of the first resistor is connected to the power supply.

6. The piezoelectric thin film array watch case button according to claim 5, characterized in that, The low-pass filter module includes a first capacitor, a fourth capacitor, a fourth resistor, a fifth resistor, a seventh resistor, a tenth resistor, and a second operational amplifier; The first end of the fourth resistor is connected to the first signal output terminal, the second end of the fourth resistor is connected to the first end of the fifth resistor, and its connection point is connected to the first end of the first capacitor. The second end of the first capacitor is simultaneously connected to the output terminal of the second operational amplifier and the second end of the seventh resistor, and its connection point serves as the second signal output terminal of the low-pass filter module. The first end of the seventh resistor is connected to both the non-inverting input of the second operational amplifier and the first end of the tenth resistor, and the second end of the tenth resistor is grounded; the second end of the fifth resistor is connected to both the first end of the fourth capacitor and the inverting input of the second operational amplifier, and the second end of the fourth capacitor is grounded.

7. The piezoelectric thin film array watch case button according to claim 6, characterized in that, The comparator module includes a sixth resistor, an eighth resistor, and a third operational amplifier. The first end of the sixth resistor is connected to the power supply terminal, and the second end of the sixth resistor is connected to both the first end of the eighth resistor and the inverting input terminal of the third operational amplifier. The second end of the eighth resistor is grounded. The second signal output terminal is connected to the non-inverting input terminal of the third operational amplifier, and the output terminal of the third operational amplifier is connected to the control chip.

8. The piezoelectric thin film array watch case button according to claim 1, characterized in that, The piezoelectric film is connected to the board via LDS circuitry.

9. The piezoelectric thin film array watch case button according to claim 8, characterized in that, The board is connected to the LDS circuit via a spring clip.

10. The piezoelectric thin film array watch case button according to claim 1, characterized in that, The inner shell is injection molded, and the outer shell is injection molded in a secondary manner.

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