CN104731151B - Measuration and feedback circuit, measuration and feedback button and measuration and feedback method - Google Patents

Abstract

The present invention provides a measurement and feedback circuit, a measurement and feedback button, and a measurement and feedback method for measuring external forces and outputting vibration feedback. The measurement and feedback circuit includes a piezoelectric material and a control unit; the control unit is initially in the Measurement mode and measure whether the output voltage generated by the deformation of the piezoelectric material by external force exceeds the preset voltage value. When the output voltage exceeds the preset voltage value, the control unit starts timing the predetermined measurement period and continues within the predetermined measurement period The output voltage is measured, and the maximum voltage value is obtained according to the change of the output voltage. When the predetermined measurement period ends, the control unit switches from the measurement mode to the feedback mode. In the feedback mode, the control unit outputs a feedback signal according to the maximum voltage value, and The feedback signal is applied to the piezoelectric material to drive the piezoelectric material to vibrate and output vibration feedback. The measurement and feedback button of the present invention can save the space for installing the sensing module in the keyboard and reduce its production cost.

Description

Measurement and feedback circuit, measurement and feedback button, and measurement and feedback method

technical field

The present invention is related to piezoelectric materials, in particular to a measurement and feedback circuit, a measurement and feedback button that realizes multi-stage measurement and feedback through piezoelectric properties and inverse piezoelectric properties of piezoelectric materials and measurement and feedback methods.

Background technique

In the prior art, a tri-state gate (Tri-state gate) is usually used as a component of a measurement and feedback circuit for switching piezoelectric materials. The circuit is initially in the measurement mode. When the piezoelectric material is deformed by an external force, it will output a voltage. After the circuit measures the output voltage, it will switch to the output mode and output an actuation signal to the piezoelectric material, so that It vibrates.

However, the existing technology does not clearly mention the complete control method of the measurement and feedback circuit of the piezoelectric material, especially when the piezoelectric material is actuated by the output of the circuit, it will start to continuously generate signals, so that the circuit cannot know when need to stop. In addition, the measurement and feedback circuits in the prior art can only provide a single stage of external force input measurement and vibration feedback output, and cannot provide different intensities or different types of feedback outputs in response to different intensities of external force inputs.

Contents of the invention

Therefore, one object of the present invention is to provide a measurement and feedback circuit, a measurement and feedback button, and a measurement and feedback method, so as to improve the above-mentioned problems encountered in the prior art.

A specific embodiment according to the present invention is a measurement and feedback circuit for measuring external force and outputting vibration feedback, comprising: a piezoelectric material for generating an output voltage when the piezoelectric material is deformed; and a control unit, coupling the piezoelectric material; wherein, the control unit is initially in a measurement mode, and the control unit measures whether the output voltage exceeds a preset voltage value; when the piezoelectric material is deformed by the external force and the generated output voltage exceeds the When the preset voltage value is reached, the control unit starts counting the predetermined measurement period, and the control unit continues to measure the output voltage within the predetermined measurement period, and obtains the maximum voltage value according to the change of the output voltage; when the predetermined measurement At the end of the period, the control unit switches from the measurement mode to the feedback mode; in the feedback mode, the control unit outputs a feedback signal according to the maximum voltage value, and applies the feedback signal to the piezoelectric material, so that the piezoelectric material The electrical material vibrates to output the vibration feedback.

In one embodiment, when the control unit switches from the measurement mode to the feedback mode, the control unit starts counting the predetermined output period, the control unit outputs the feedback signal to the piezoelectric material within the predetermined output period, and when the predetermined output period ends, the control unit The unit will exit feedback mode.

In one embodiment, the output voltage generated by the deformation of the piezoelectric material by the external force corresponds to the deformation of the piezoelectric material, and the deformation of the piezoelectric material corresponds to the external force.

In one embodiment, when the maximum voltage value is the first voltage, the vibration of the piezoelectric material has a first vibration characteristic, and when the maximum voltage value is a second voltage, the vibration of the piezoelectric material has a second vibration characteristic, the first The vibration characteristic and the second vibration characteristic are selected from at least one of vibration amplitude, vibration duration, vibration frequency and vibration waveform.

In one embodiment, the control unit is further coupled to the output device, and the control unit further applies a feedback signal to the output device to drive the output device to output light feedback or sound feedback.

Another specific embodiment of the present invention is a measurement and feedback button. In this embodiment, the measurement and feedback button is used to measure external force and output vibration feedback. The measurement and feedback button includes a keycap, a piezoelectric Material and control unit. The piezoelectric material is placed under the keycap. When the keycap is pressed by an external force, the piezoelectric material will be deformed to generate an output voltage. The control unit is coupled to the piezoelectric material. The control unit is initially in the measurement mode. The unit starts timing the predetermined measurement period, the control unit continues to measure the output voltage within the predetermined measurement period, and obtains the maximum voltage value according to the change of the output voltage, when the predetermined measurement period ends, the control unit switches from the measurement mode to the feedback mode mode, in the feedback mode, the control unit outputs a feedback signal according to the maximum voltage value, and applies the feedback signal to the piezoelectric material to drive the piezoelectric material to vibrate to output vibration feedback and transmit it to the keycap.

In one embodiment, the control unit measures whether the output voltage exceeds a predetermined voltage value; when the output voltage generated by the piezoelectric material exceeds the predetermined voltage value, the control unit starts counting a predetermined measurement period.

In one embodiment, the measurement and feedback key further includes a keyboard encoding circuit, and the character symbol is displayed on the keycap. When the maximum voltage value is less than the preset threshold value, the keyboard encoding circuit outputs the lowercase font of the character symbol. When the maximum voltage When the value is greater than or equal to the preset critical value, the keyboard encoding circuit outputs the uppercase font of the character symbol.

In one embodiment, the measurement and feedback button further includes a button electrode, and the button electrode is coupled to the control unit. When the potential difference between the piezoelectric material and the button electrode is not zero, the control unit determines that the keycap is not pressed; when the potential difference between the piezoelectric material and the button electrode is zero, the control unit determines that the keycap is pressed.

In one embodiment, the output voltage generated by the deformation of the piezoelectric material by the external force corresponds to the deformation of the piezoelectric material, and the deformation of the piezoelectric material corresponds to the external force.

In one embodiment, when the maximum voltage value is the first voltage, the vibration of the piezoelectric material has a first vibration characteristic; when the maximum voltage value is a second voltage, the vibration of the piezoelectric material has a second vibration characteristic; the first The vibration characteristic and the second vibration characteristic are selected from at least one of vibration amplitude, vibration duration, vibration frequency and vibration waveform.

In one embodiment, the control unit is further coupled to the output device, and the control unit further applies a feedback signal to the output device to drive the output device to output light feedback or sound feedback.

Another specific embodiment according to the present invention is a method of measurement and feedback. In this embodiment, the method of measurement and feedback is used to measure external force and output vibration feedback. The method of measurement and feedback includes the following steps: (a ) to enter the measurement mode; (b) start counting the predetermined measurement period; (c) continuously measure the output voltage generated by the piezoelectric material within the predetermined measurement period, wherein the piezoelectric material is deformed by an external force to generate an output voltage, and Obtaining the maximum voltage value according to the change of the output voltage; (d) switching from the measurement mode to the feedback mode when the predetermined measurement period ends; (e) outputting a feedback signal according to the maximum voltage value in the feedback mode; and (f) The feedback signal is applied to the piezoelectric material to drive the piezoelectric material to vibrate and output vibration feedback.

In one embodiment, the measurement and feedback method further includes the following steps: (b') In the measurement mode, measure whether the output voltage exceeds a preset voltage value, and when the measurement result is that the output voltage exceeds the preset voltage value , to start timing the scheduled measurement period.

In one embodiment, the measurement and feedback method further includes the following steps: when the step (d) is switched from the measurement mode to the feedback mode, start counting the predetermined output period; output the feedback signal within the predetermined output period; and when the predetermined output At the end of the period, exit reward mode.

In one embodiment, the output voltage generated by the deformation of the piezoelectric material by the external force corresponds to the deformation of the piezoelectric material, and the deformation of the piezoelectric material corresponds to the external force.

In one embodiment, when the maximum voltage value is the first voltage, the vibration of the piezoelectric material has a first vibration characteristic; when the maximum voltage value is a second voltage, the vibration of the piezoelectric material has a second vibration characteristic. The first vibration characteristic and the second vibration characteristic are selected from at least one of vibration amplitude, vibration duration, vibration frequency and vibration waveform.

In one embodiment, the measurement and feedback method further includes the following step: transmitting the vibration feedback output by the piezoelectric material to the keycap disposed above the piezoelectric material.

In one embodiment, the measurement and feedback method further includes the following steps: applying a feedback signal to the output device, driving the output device to output light feedback or sound feedback.

Compared with the prior art, the measurement and feedback circuit and method according to the present invention utilize the piezoelectric characteristics and inverse piezoelectric characteristics of piezoelectric materials to realize the specific effects of multi-stage measurement and feedback. In addition, the measurement and feedback button according to the present invention can be applied to an input device such as a keyboard. Since only the same set of piezoelectric materials can be used to complete external force measurement and vibration feedback at the same time, it is possible to save the need to set up a sensor in the keyboard. Module space and reduce its production cost.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1 is a functional block diagram of a measurement and feedback circuit according to an embodiment of the present invention;

FIG. 2 is a functional block diagram of the measurement and feedback circuit in FIG. 1 in the measurement mode;

3 is a schematic diagram of obtaining the maximum voltage value according to the variation of the output voltage within a predetermined measurement period;

FIG. 4 is a functional block diagram of the measurement and feedback circuit in FIG. 1 in the feedback mode;

5 is a schematic diagram of the measurement and feedback circuit applying the feedback signal to the output device to drive the output device to output other types of feedback;

FIG. 6 is an exploded view of a measurement and feedback button provided with a piezoelectric material;

FIG. 7 is a flowchart of a measurement and feedback method according to another embodiment of the present invention.

detailed description

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

A specific embodiment according to the present invention is a measurement and feedback circuit. In this embodiment, the measurement and feedback circuit utilizes the piezoelectric and inverse piezoelectric properties of the piezoelectric material to measure the external force on the piezoelectric material and drives the piezoelectric material to output corresponding vibration feedback.

First, please refer to FIG. 1 , which is a functional block diagram of a measurement and feedback circuit according to an embodiment of the present invention. As shown in FIG. 1 , the measurement and feedback circuit 1 includes a piezoelectric material PZ, a path switching unit 10 and a control unit 12 . Wherein, the piezoelectric material PZ is coupled to the path switching unit 10 ; the path switching unit 10 is coupled to the control unit 12 .

The control unit 12 of the measurement and feedback circuit 1 further includes a measurement unit 120 , a microprocessor 122 and a driving unit 124 . Wherein, the measuring unit 120 is coupled to the path switching unit 10 and the microprocessor 122; the microprocessor 122 is coupled to the path switching unit 10, the measuring unit 120 and the driving unit 124; the driving unit 124 is coupled to the path switching unit 10 and the microprocessor device 122.

In this embodiment, the piezoelectric material PZ has two functions: (1) in the measurement mode, when the piezoelectric material PZ is deformed by an external force, a corresponding output voltage is generated, and (2) in the feedback mode , when the piezoelectric material PZ is driven by the feedback signal, corresponding vibration feedback is generated, and the feedback signal may correspond to the maximum voltage value of the output voltage. The path switching unit 10 is used to switch different signal transmission paths between the piezoelectric material PZ and the control unit 12 in the measurement mode or the feedback mode; the control unit 12 is used to measure the output generated by the piezoelectric material in the measurement mode The maximum voltage value is obtained according to the change of the output voltage within a predetermined measurement period, and a corresponding feedback signal is generated according to the maximum voltage value in the feedback mode to drive the piezoelectric material PZ to generate corresponding vibration feedback.

Next, the operation of the measurement and feedback circuit 1 in this embodiment in the measurement mode and the feedback mode will be described in detail respectively.

As shown in Figure 2, when the control unit 12 is in the measurement mode, the path switching unit 10 will switch the signal transmission path between the piezoelectric material PZ and the control unit 12, so that the piezoelectric material PZ and the quantity in the control unit 12 The measuring unit 120 is coupled, so that the measuring unit 120 in the control unit 12 can measure the output voltage V _OUT generated by the piezoelectric material PZ.

In the measurement mode, the measurement unit 120 will first measure whether the output voltage V _OUT generated by the piezoelectric material PZ exceeds a preset voltage value, so as to avoid malfunction due to the background voltage value of the piezoelectric material PZ. In fact, the preset voltage value can be preset by the system or set by the user, and there is no specific limitation.

If the measurement result of the measurement unit 120 is that the output voltage V _OUT generated by the piezoelectric material PZ does not exceed the preset voltage value, the measurement unit 120 continues to measure the output voltage V _OUT generated by the piezoelectric material PZ; if The measurement result of the measurement unit 120 is that the output voltage V _OUT generated by the piezoelectric material PZ has exceeded the preset voltage value, which means that the piezoelectric material PZ is deformed by the external force F and generates a sufficiently large output voltage V _OUT , which means The timing measurement unit 120 will start counting the predetermined measurement period and continuously measure the output voltage V _OUT within the predetermined measurement period, and then the microprocessor 122 will obtain the maximum voltage according to the change of the output voltage V _OUT within the predetermined measurement period value.

For example, as shown in FIG. 3 , before time 9 milliseconds (ms), the output voltage V _OUT generated by the piezoelectric material PZ is 0 due to no external force. At the moment when the voltage is pressed for 9 ms, the output voltage V _OUT generated by the piezoelectric material PZ will begin to change drastically. If the output voltage V _OUT generated by the piezoelectric material PZ is a negative voltage, when the output voltage V _OUT is lower than the preset voltage value −V _D within 10 ms, the measurement unit 120 starts counting the predetermined measurement period ΔT. Conversely, if the output voltage V _OUT generated by the piezoelectric material PZ is a positive voltage, when the output voltage V _OUT exceeds the preset voltage value V _D , the measurement unit 120 will also start counting the predetermined measurement period ΔT. That is to say, as long as the absolute value |V _OUT | of the output voltage V _OUT generated by the piezoelectric material PZ is greater than the preset voltage value V _D , the measurement unit 120 starts counting the predetermined measurement period ΔT. Assuming that the predetermined measurement period ΔT timed by the measurement unit 120 is 10 milliseconds (ms), the measurement unit 120 will continue to measure the output voltage V _OUT within the 10 milliseconds, and then the microprocessor 122 will measure the output voltage V OUT according to the output voltage V _OUT The maximum voltage value V _MAX is obtained from the change situation within these 10 milliseconds.

When the predetermined measurement period ΔT ends, the control unit 12 will switch from the original measurement mode to the feedback mode, as shown in FIG. The signal transmission path connects the piezoelectric material PZ to the driving unit 124 in the control unit 12 , so that the driving unit 124 in the control unit 12 can drive the piezoelectric material PZ to generate vibration feedback.

After the microprocessor 122 obtains the maximum voltage value V _MAX , the microprocessor 122 will generate a corresponding feedback signal FB to the driving unit 124 according to the maximum voltage value V _MAX , and the driving unit 124 will apply the feedback signal FB to the piezoelectric material PZ, to drive the piezoelectric material PZ to vibrate and output the corresponding vibration feedback VF.

Table I

Maximum voltage value V _MAX Vibration frequency of piezoelectric material PZ less than 0.3 volts 150 Hz 0.3 volts to 0.6 volts 200 Hz greater than 0.6 volts 250 Hz

Formula 1: Vibration duration of piezoelectric material PZ (milliseconds) = maximum voltage value V _MAX (volts) * 100

In practical applications, the microprocessor 122 can generate feedback signals FB corresponding to different maximum voltage values V _MAX according to a look-up table (such as Table 1) or a formula (such as Formula 1), and drive the vibration of the piezoelectric material PZ to have a corresponding Corresponding vibration characteristics to generate corresponding vibration feedback VF. It should be noted that the vibration characteristics of the piezoelectric material PZ are not limited to the above-mentioned vibration duration and vibration frequency, and can actually be the vibration amplitude (for example: the higher the maximum voltage value V _MAX , the larger the vibration amplitude) or The vibration waveform (for example: the higher the maximum voltage V _MAX , the closer the vibration waveform is to a square wave), or a combination of the above changes, there is no specific limitation on the vibration characteristics.

From the above, it can be seen that in the measurement mode, the piezoelectric material PZ will be deformed to different degrees when it is subjected to different magnitudes of external forces F, and output output voltages V _OUT with different maximum voltage values V _MAX , so the measurement and measurement methods of the present invention The feedback circuit 1 can realize multi-stage external force measurement; in addition, the measurement and feedback circuit 1 of the present invention can control the piezoelectric material PZ to generate according to different maximum voltage values V _MAX (that is, external forces F of different sizes) in the feedback mode. Vibration feedback VFs with different vibration characteristics can realize multi-stage vibration feedback output.

It should be noted that, in addition to the above-mentioned vibration feedback, as shown in FIG. The output device 2 emits light to output light to feed back to LF or drive the output device 2 to emit sound to output sound to feed back to SF.

Another specific embodiment according to the present invention is a measurement and feedback button. In this embodiment, the measurement and feedback button uses the piezoelectric and inverse piezoelectric properties of the piezoelectric material to measure the external force on the piezoelectric material and drive the piezoelectric material to output corresponding vibration feedback. In fact, the measurement and feedback button of this embodiment can be applied to any push-type input device, such as a keyboard, but not limited thereto.

Please refer to FIG. 6 . FIG. 6 is an exploded view of the measurement and feedback buttons provided with piezoelectric materials disclosed in the CN103354185A patent application. In the measurement and feedback button 3, the piezoelectric material PZ is disposed under the keycap 30 and between the first circuit board 38 and the second circuit board 39, the first board 34 and the second board 36 are stacked on each other, The first circuit board 38 is sandwiched between the first board 34 and the second board 36 , the second circuit board 39 is arranged on the bottom board 32 relative to the first circuit board 38 , and the button electrodes 37 are arranged on the second circuit board 39 And located below the piezoelectric material PZ. The piezoelectric material PZ and the button electrode 37 are respectively coupled to the control unit (not shown). When the potential difference between the piezoelectric material PZ and the button electrode 37 is not zero, it means that the piezoelectric material PZ arranged under the key cap 30 is not deformed by external force and contacts the button electrode 37 below it, and the control unit will determine that The key cap 30 is not pressed; when the potential difference between the piezoelectric material PZ and the key electrode 37 is zero, it means that the piezoelectric material PZ disposed under the key cap 30 has been pressed and deformed by an external force and is in contact with the key electrode 37 below it. , the control unit will determine that the keycap 30 is pressed.

It should be noted that when the keycap 30 is pressed by an external force, the piezoelectric material PZ will be deformed to generate an output voltage. The control unit in the measurement mode will continuously measure the output voltage of the piezoelectric material PZ within a predetermined measurement period and obtain the maximum voltage value according to the change of the output voltage. Then, the control unit switches to the feedback mode and outputs a feedback signal to the piezoelectric material PZ according to the maximum voltage value, so as to drive the piezoelectric material PZ to vibrate and output the vibration to feed back to the keycap 30 . If the user presses the keycap 30 with his finger at this time, he will feel the vibration feedback.

In addition, the measurement and feedback button 3 may further include a keyboard encoding circuit (not shown). When the user's hand presses the measurement and feedback button 3 provided on the keyboard, assuming that the keycap 30 of the measurement and feedback button 3 displays a character symbol (such as the English letter A), when the maximum voltage value is less than the preset threshold value, the keyboard coding circuit will output the lowercase font of the character symbol (for example, the lowercase font a of the English letter A); when the maximum voltage value is greater than or equal to the preset critical value, the keyboard coding circuit will output the uppercase of the character symbol Glyph (for example, the uppercase glyph A of the English letter A). In fact, the preset threshold can be preset by the system or set by the user, and there is no specific limitation.

Another specific embodiment according to the present invention is a measurement and feedback method. In this embodiment, the measurement and feedback method utilizes piezoelectric properties and inverse piezoelectric properties of piezoelectric materials to measure external forces and output vibration feedback. In fact, the measurement and feedback method of this embodiment can be applied to any push-type input device, such as a keyboard, but not limited thereto.

Please refer to FIG. 7 , which shows a flow chart of the measurement and feedback method of this embodiment. As shown in FIG. 7 , firstly, in step S10 , the method enters into a measurement mode. In step S11, the method measures whether the output voltage generated by the piezoelectric material exceeds a preset voltage value in the measurement mode. In fact, the preset voltage value can be preset by the system or set by the user, and there is no specific limitation.

It should be noted that since the piezoelectric material has piezoelectric properties, it is deformed by an external force to generate an output voltage. In more detail, the output voltage generated by the deformation of the piezoelectric material by the external force corresponds to the deformation of the piezoelectric material, and the deformation of the piezoelectric material corresponds to the external force. That is to say, when the external force on the piezoelectric material is greater, the deformation of the piezoelectric material will be greater and the output voltage generated by it will be greater; and vice versa.

If the measurement result of step S11 is yes, that is, the output voltage generated by the piezoelectric material has exceeded the preset voltage value, then the method executes steps S12 and S13 in sequence, starting from the first time T1=0 and continuing for a certain amount of time. The output voltage generated by the piezoelectric material is measured and the maximum voltage value is obtained according to its change. If the measurement result of step S11 is negative, that is, the output voltage generated by the piezoelectric material does not exceed the preset voltage value, then the method re-executes step S11.

In step S14, the method judges whether the first time T1 is greater than a predetermined measurement period. If the determination result of step S14 is yes, that is, the first time T1 is greater than the predetermined measurement period, then the method executes step S15 to switch from the original measurement mode to the feedback mode. If the judgment result of step S14 is negative, that is, the first time T1 is not greater than the predetermined measurement period, then the method continues to execute step S13. In fact, the predetermined measurement period can be preset by the system or set by the user, without any specific limitation.

In step S16, the method determines a corresponding feedback signal according to the maximum voltage value in the feedback mode. Next, the method executes steps S17 and S18 in sequence, counting from the second time T2=0 and outputting the corresponding feedback signal determined in step S16.

In step S19, the method judges whether the second time T2 is greater than a predetermined output period. If the judgment result of step S19 is yes, that is, the second time T2 is greater than the predetermined output period, which means that the feedback signal has been output, then the method executes step S20 to exit the feedback mode. If the judgment result of step S19 is negative, that is, the second time T2 is not greater than the predetermined output period, it means that the output of the feedback signal has not been completed, and the method continues to execute step S18. In fact, the predetermined output time period can be preset by the system or set by the user, and there is no specific limitation. It should be noted that after the method exits the feedback mode in step S20, the method can switch back to the original measurement mode, but not limited thereto.

It should be noted that the feedback signal corresponding to the maximum voltage value output by this method can be applied to the piezoelectric material, so as to drive the piezoelectric material to generate corresponding vibration and output vibration feedback. In practical application, when the maximum voltage value is the first voltage, the vibration of the piezoelectric material has the first vibration characteristic; when the maximum voltage value is the second voltage, the vibration of the piezoelectric material has the second vibration characteristic.

The above-mentioned first vibration characteristic and second vibration characteristic may be vibration amplitude, vibration duration, vibration frequency or vibration waveform. Taking the vibration duration as an example, when the maximum voltage value is 1 volt, the vibration duration of the piezoelectric material is 0.3 seconds; when the maximum voltage value is 2 volts, the vibration duration of the piezoelectric material is 0.6 seconds. Since the maximum voltage value also corresponds to the magnitude of the external force on the piezoelectric material, when the external force pressed to the piezoelectric material is large, the corresponding maximum voltage value is also large, and the vibration feedback generated by the piezoelectric material The duration is also longer; and vice versa.

In fact, the above measurement and feedback methods can also be applied to buttons. In one embodiment, the piezoelectric material is disposed under the key cap of the key. When the piezoelectric material vibrates to output vibration feedback, the vibration feedback will be transmitted to the keycap disposed above the piezoelectric material, so that the user's finger pressing on the keycap of the key will feel the vibration feedback.

In addition, in addition to driving the piezoelectric material to generate vibration feedback, the method can also apply a feedback signal to the output device to drive the output device to output other types of feedback, such as emitting light to output light feedback or emitting sound to output sound feedback.

Compared with the prior art, the measurement and feedback circuit and method according to the present invention utilize the piezoelectric and inverse piezoelectric properties of the piezoelectric material to achieve specific effects of multi-stage measurement and feedback. In addition, the measurement and feedback button according to the present invention can be applied to an input device such as a keyboard. Since only the same set of piezoelectric materials can be used to complete external force measurement and vibration feedback at the same time, it is possible to save the need to set up a sensor in the keyboard. Module space and reduce its production costs.

Through the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the appended claims of the present invention.

Claims (17)

1. a kind of measurement and feedback circuit, in order to measure external force and to export vibration feedback it is characterised in that this measurement and feedback are electric Road comprises：

Piezoelectric, for producing output voltage when this piezoelectric is pressed deformation, and when this piezoelectric is driven Produce this vibration feedback；

Control unit, comprises measurement unit and driver element；And

Path switching unit, this path switching unit is respectively coupled to this piezoelectric and this control unit, and the switching of this path is single Unit is in order to switch the unlike signal transmission path between this piezoelectric and this control unit；

Wherein, when this control unit is initially in measurement pattern, this path switching unit can switch this piezoelectric and this control Signal transmission path between unit, allows this piezoelectric to couple with this measurement unit, and this control unit passes through this measurement unit Measure whether this piezoelectric this output voltage produced exceedes preset voltage value；

When this piezoelectric by this outer force deformation and produce this output voltage exceed this preset voltage value when, this control unit is opened Beginning timing makes a reservation for measure the period, and this control unit persistently measures this output voltage in this predetermined measurement in the period, and defeated according to this The change going out voltage obtains maximum voltage value；

At the end of this predetermined measurement period, from this measurement pattern switching to feedback pattern, the switching of this path is single for this control unit Unit can switch signal transmission path between this piezoelectric and this control unit, allows this piezoelectric and this driver element coupling Connect；Under this feedback pattern, this control unit exports feedback signal to this driver element according to this maximum voltage value, and by this drive Moving cell this feedback signal is applied to this piezoelectric so that this piezoelectric material vibration and export this vibration feedback.

2. measurement as claimed in claim 1 and feedback circuit are it is characterised in that work as this control unit from this measurement pattern switching During to this feedback pattern, this control unit starts timing and makes a reservation for the output period, and this control unit is defeated within this predetermined output period Go out this feedback signal to this piezoelectric, at the end of this predetermined output period, this control unit exits this feedback pattern.

3. measurement as claimed in claim 1 and feedback circuit are it is characterised in that this piezoelectric is produced by this outer force deformation This output voltage correspond to this piezoelectric deflection, and the deflection of this piezoelectric correspond to this external force.

4. measurement as claimed in claim 1 and feedback circuit are it is characterised in that when this maximum voltage value is first voltage, be somebody's turn to do The vibration of piezoelectric has the first vibration characteristics, when this maximum voltage value is second voltage, the vibration tool of this piezoelectric There is the second vibration characteristics, this first vibration characteristics and this second vibration characteristics are selected from vibration amplitude, vibration duration, vibration Frequency and one kind at least within of vibrational waveform.

5. as claimed in claim 1 measure and feedback circuit it is characterised in that this control unit is coupled to output device, this control This feedback signal is applied to this output device by unit processed, orders about this output device output light feedback or sound feedback.

6. a kind of measurement and feedback button, in order to measure external force and to export vibration feedback it is characterised in that this measurement and feedback are pressed Key comprises：

Keycap；

Piezoelectric, is arranged at below this keycap, when this keycap is by this pressed by external force, the deformation of this piezoelectric can be led to produce Give birth to output voltage, and exported this vibration when this piezoelectric drives and be fed back to this keycap；

Control unit, comprises measurement unit and driver element；And

Path switching unit, this path switching unit is respectively coupled to this piezoelectric and this control unit, and the switching of this path is single Unit is in order to switch the unlike signal transmission path between this piezoelectric and this control unit；

Wherein, when this control unit is initially in measurement pattern, this path switching unit can switch this piezoelectric and this control Signal transmission path between unit, allows this piezoelectric to couple with this measurement unit, and this control unit passes through this measurement unit Measure whether this piezoelectric this output voltage produced exceedes preset voltage value；When this output produced by this piezoelectric When voltage exceedes this preset voltage value, this control unit starts timing and makes a reservation for measure the period, and this control unit is in this predetermined measurement Persistently measure this output voltage in period, and maximum voltage value is obtained according to the change of this output voltage；

At the end of this predetermined measurement period, from this measurement pattern switching to feedback pattern, the switching of this path is single for this control unit Unit can switch signal transmission path between this piezoelectric and this control unit, allows this piezoelectric and this driver element coupling Connect；Under this feedback pattern, this control unit exports feedback signal to this driver element according to this maximum voltage value, and by this drive This feedback signal is applied to this piezoelectric by moving cell, orders about this piezoelectric material vibration and exports this vibration feedback and pass to This keycap.

7. measurement as claimed in claim 6 and feedback button are it is characterised in that this measurement and feedback button also comprise keyboard volume Code circuit, this keycap shows character symbol, and when this maximum voltage value is less than preset critical, this keyboard coding circuit exports The small letter font of this character symbol, when this maximum voltage value is more than or equal to this preset critical, this keyboard coding circuit is defeated Go out the capitalization font of this character symbol.

8. measurement as claimed in claim 6 and feedback button are it is characterised in that this measurement and feedback button also comprise button electricity Pole, this button electrode couples this control unit, when the potential difference between this piezoelectric and this button electrode is not zero, this control Unit processed judges that this keycap is not pressed, when the potential difference between this piezoelectric and this button electrode is zero, this control list Unit judges that this keycap is pressed.

9. measurement as claimed in claim 6 and feedback button are it is characterised in that this piezoelectric is produced by this outer force deformation This output voltage correspond to this piezoelectric deflection, and the deflection of this piezoelectric correspond to this external force.

10. as claimed in claim 6 measure and feedback button it is characterised in that when this maximum voltage value be first voltage when, The vibration of this piezoelectric has the first vibration characteristics, when this maximum voltage value is second voltage, the vibration of this piezoelectric There is the second vibration characteristics, this first vibration characteristics and this second vibration characteristics are selected from vibration amplitude, vibration duration, shake Dynamic frequency and one kind at least within of vibrational waveform.

11. as claimed in claim 6 measure and feedback button it is characterised in that this control unit is further coupled to output device, This feedback signal is applied to this output device by this control unit, orders about this output device output light feedback or sound feedback.

A kind of 12. measurement and feedback methods measuring key press using piezoelectric and exporting vibration feedback, this piezoelectricity Material is subject to pressed by external force to produce output voltage when deforming in order to measure this external force, and the output vibration when this piezoelectric is driven It is characterised in that this button comprises piezoelectric, path switching unit and control unit, this control unit comprises to measure list for feedback Unit and driver element, this measurement and feedback method comprise the steps of：

A. enter measurement pattern, the signal that now this path switching unit can switch between this piezoelectric and this control unit passes Defeated path, allows this piezoelectric to couple with this measurement unit；

B., under this measurement pattern, this control unit measures this piezoelectric this output voltage produced by this measurement unit Whether exceed preset voltage value, when measurement exceedes this preset voltage value for this output voltage, start timing and make a reservation for measure Period；

C. persistently measure this output voltage produced by this piezoelectric in this predetermined measurement in the period, and according to this output voltage Change obtain maximum voltage value；

D. at the end of this predetermined measurement period, from this measurement pattern switching to feedback pattern, now this path switching unit meeting Switch the signal transmission path between this piezoelectric and this control unit, allow this piezoelectric to couple with this driver element；

E., under this feedback pattern, feedback signal is exported to this driver element according to this maximum voltage value；And

F. this feedback signal is applied to by this piezoelectric by this driver element, orders about this piezoelectric material vibration and export this vibration Feedback.

13. as claimed in claim 12 measure and feedback method it is characterised in that this measurement and feedback method also comprise following Step：

When step (d) is from this measurement pattern switching to this feedback pattern, starts timing and make a reservation for the output period；

Export this feedback signal within this predetermined output period；And

At the end of this predetermined output period, exit this feedback pattern.

14. measurements as claimed in claim 12 and feedback method are it is characterised in that this piezoelectric is produced by this outer force deformation This raw output voltage corresponds to the deflection of this piezoelectric, and the deflection of this piezoelectric corresponds to this external force.

15. as claimed in claim 12 measure and feedback method it is characterised in that when this maximum voltage value be first voltage when, The vibration of this piezoelectric has the first vibration characteristics, when this maximum voltage value is second voltage, the vibration of this piezoelectric There is the second vibration characteristics, this first vibration characteristics and this second vibration characteristics are selected from vibration amplitude, vibration duration, shake Dynamic frequency and one kind at least within of vibrational waveform.

16. as claimed in claim 12 measure and feedback method it is characterised in that this measurement and feedback method also comprise following Step：

This vibration feedback that this piezoelectric is exported passes to the keycap being arranged above this piezoelectric.

17. as claimed in claim 12 measure and feedback method it is characterised in that this measurement and feedback method also comprise following Step：

This feedback signal is applied to output device, orders about this output device output light feedback or sound feedback.