Touch sensor devices
The embodiments of the present disclosure provide a touch sensor device. The touch sensor device comprises a housing, configured to provide a touch region; and at least one sensor, configured to be fixed near the touch region. The at least one sensor includes: a signal transmitting unit, configured to generate a vibration signal under the action of an excitation signal; a signal receiving unit, configured to receive the vibration signal and generate an output signal; and a processor, configured to recognize a touch operation performed on the touch region according to the output signal.
1 . A touch sensor device, comprising:
a housing, configured to provide a touch region; and
at least one sensor, configured to be fixed near the touch region, wherein the at least one sensor includes:
a signal transmitting unit, configured to generate a vibration signal under the action of an excitation signal; wherein the signal transmitting unit includes a piezoelectric patch;
a signal receiving unit, configured to receive the vibration signal and generate an output signal, wherein the signal receiving unit is disposed on a side of the signal transmitting unit away from the housing, the signal transmitting unit is located between the housing and the signal receiving unit; wherein the signal receiving unit includes an air conduction microphone, the air conduction microphone includes a diaphragm, and a cavity is formed between the piezoelectric patch and the diaphragm; and
a processor, configured to recognize a touch operation performed on the touch region according to the output signal.
2 . The touch sensor device of claim 1 , wherein the air conduction microphone includes a microphone housing, the microphone housing forms an accommodation cavity for accommodating the diaphragm, and the diaphragm is configured to divide the accommodation cavity into a front cavity and a rear cavity, wherein
the cavity is in flow communication with the front cavity, and the processor is disposed in the rear cavity.
3 . The touch sensor device of claim 1 , wherein
the excitation signal includes a single-frequency electrical signal, and
the processor is configured to determine whether a touch occurs according to an amplitude of an output signal corresponding to the single-frequency electrical signal.
4 . The touch sensor device of claim 3 , wherein
the signal transmitting unit is configured to vibrate to drive the touch sensor device including the housing to vibrate to form a vibration system;
a frequency of the single-frequency electrical signal is less than a resonance frequency of the vibration system; and
to recognize the touch operation performed on the touch region, the processor is configured to:
determine that the touch operation occurs when a voltage amplitude of the output signal increases.
5 . The touch sensor device of claim 3 , wherein
the signal transmitting unit is configured to vibrate to drive the touch sensor device including the housing to vibrate to form a vibration system;
a frequency of the single-frequency electrical signal is near a resonance frequency of the vibration system; and
to recognize the touch operation performed on the touch region, the processor is configured to:
determine that the touch operation occurs when a voltage amplitude of the output signal decreases.
6 . The touch sensor device of claim 1 , wherein
the excitation signal includes electrical signals of multiple frequencies,
the output signal includes output signals of multiple frequencies corresponding to the electrical signals of multiple frequencies, and
the processor is configured to perform a weighting operation on the output signals of multiple frequencies and determine whether a touch occurs based on a result of the weighting operation.
7 . The touch sensor device of claim 1 , wherein
the excitation signal includes a sweep-frequency electrical signal,
the output signal includes a sweep-frequency output signal corresponding to the sweep-frequency electrical signal, and
the processor is configured to obtain a curve corresponding to the sweep-frequency output signal and determine whether a touch occurs according to a shape of the curve.
8 . The touch sensor device of claim 1 , wherein the touch region is disposed on a surface of the housing, and the at least one sensor is disposed in an inner cavity formed by the housing on an inner side wall of the housing facing the touch region.
9 . The touch sensor device of claim 1 , wherein the touch sensor device further includes a connection portion disposed between the air conduction microphone and the piezoelectric patch, and the connection portion is configure to connect the air conduction microphone and the piezoelectric patch, and cooperate with the air conduction microphone and the piezoelectric patch to form the cavity.
10 . The touch sensor device of claim 2 , wherein a hole portion is disposed on the microphone housing, and the cavity is in flow communication with the front cavity through the hole portion.
11 . The touch sensor device of claim 2 , wherein the air conduction microphone includes a diaphragm connection portion in the accommodation cavity, the diaphragm is disposed in the accommodation cavity and connected to an inner wall of the microphone housing through the diaphragm connection portion.
12 . The touch sensor device of claim 2 , wherein the cavity is located outside of the front cavity and the rear cavity, wherein when the piezoelectric patch vibrates in response to the excitation signal, vibrations of the piezoelectric patch cause a change in air pressure in the cavity or the front cavity to drive the diaphragm to vibrate.
13 . A touch sensor device, comprising:
a housing, configured to provide a touch region; and
a sensor, configured to be fixed near the touch region, wherein the sensor includes:
a vibration element, wherein the vibration element includes a piezoelectric patch, and a resonance frequency of the piezoelectric patch is in a range of 100 kHz-100 MHz;
an inductor element, wherein the vibration element and the inductor element are connected in parallel to form a loop, and the loop oscillates under the action of an excitation signal to generate an output signal; and
a processor, configured to recognize a touch operation performed on the touch region according to an oscillation frequency of the output signal.
14 . The touch sensor device of claim 13 , wherein an inductance value of the inductor element is in a range of 0.1 uH-100 uH.
15 . The touch sensor device of claim 13 , wherein the sensor further includes a capacitor element, and the capacitor element is connected to the vibration element and the inductor element to form the loop.
16 . The touch sensor device of claim 15 , wherein the capacitor element is connected in series or in parallel with the vibration element.
17 . The touch sensor device of claim 13 , wherein a value of a quality factor of the loop is greater than 2.
18 . The touch sensor device of claim 13 , wherein the sensor is connected to the housing through the vibration element, and the vibration element forms a vibration system with the housing.
19 . The touch sensor device of claim 13 , wherein the touch region and the vibration element face each other on two sides of the housing.
20 . The touch sensor device of claim 13 , wherein a center of the vibration element faces a center of the touch region.