CN211856927U - Living body approach detection device and electronic apparatus - Google Patents

Abstract

The embodiment of the application provides a living body approaches detection device, electronic equipment, and living body approaches detection device includes: the device comprises a capacitance sensor, a humidity sensor and a control circuit, wherein the capacitance sensor and the humidity sensor are respectively connected with the control circuit; the capacitive sensor senses that a living body approaches to generate a first capacitive signal and transmits the first capacitive signal to the control circuit; the humidity sensor senses the approach of a living body to generate a first humidity signal and transmits the first humidity signal to the control circuit; the control circuit comprises a clock circuit, a signal receiving circuit and a signal detection circuit; the clock circuit is connected with the signal receiving circuit, the signal receiving circuit is electrically connected with the capacitance sensor and the humidity sensor, and the signal receiving circuit is connected with the signal detection circuit. The embodiment of the application reduces the false recognition when the detected living body approaches and improves the accuracy of the approach of the detected living body.

Description

Living body approach detection device and electronic apparatus

Technical Field

The embodiment of the application relates to the technical field of electronics, in particular to a living body approach detection device and electronic equipment.

Background

With the development of electronic devices and earphones, in order to more intelligently meet the requirement of a user for listening to audio, whether the user has an intention of listening may be determined, for example, two scenes of wearing and taking off the earphone by the user, and for example, two scenes of approaching the earphone and departing the earphone by the user may be identified. In general, the capacitance sensor is used for detecting the change of the sensing capacitance to identify, but in the process of implementing the above scheme, taking the earphone as an example, if a user takes the earphone off and puts the earphone on a conductive desktop such as metal, or conductive objects around the earphone are close to the earphone, the capacitance sensor can also detect the change, so that false identification can be generated, and the user experience is reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a living body approach detection device and an electronic apparatus, so as to overcome the defect of the prior art that when a sensing living body approaches, a false recognition is easily generated.

In a first aspect, an embodiment of the present application provides a living body proximity detection apparatus, which includes: the device comprises a capacitance sensor, a humidity sensor and a control circuit, wherein the capacitance sensor and the humidity sensor are respectively connected with the control circuit; the capacitive sensor senses that a living body approaches to generate a first capacitive signal and transmits the first capacitive signal to the control circuit; the humidity sensor senses the approach of a living body to generate a first humidity signal and transmits the first humidity signal to the control circuit; a control circuit including a clock circuit, a signal receiving circuit that receives the first capacitance signal and the first humidity signal according to a clock cycle of a clock signal output by the clock circuit, and a signal detecting circuit that generates a living body approach signal according to the first capacitance signal and the first humidity signal received by the signal receiving circuit; the clock circuit is connected with the signal receiving circuit and sends a clock signal to the signal receiving circuit; the signal receiving circuit is electrically connected with the capacitance sensor and the humidity sensor and is connected with the signal detection circuit.

Optionally, in an embodiment of the present application, the humidity sensor includes: the humidity sensitive device, the first driving circuit and the first operational amplifier; two ends of the humidity sensitive device are respectively connected with the first driving circuit and the inverting input end of the first operational amplifier; the positive phase input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is connected with the control circuit.

Optionally, in an embodiment of the present application, the humidity sensor further includes a first feedback branch; two ends of the first feedback branch are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.

Optionally, in one embodiment of the present application, the humidity sensitive device comprises a first electrode, a second electrode, and a shielding metal mesh disposed outside the first electrode and the second electrode.

Optionally, in an embodiment of the present application, the capacitive sensor includes: the inductive capacitor, the second drive circuit and the second operational amplifier; two ends of the induction capacitor are respectively connected with the second driving circuit and the inverting input end of the second operational amplifier; the positive phase input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with the control circuit.

Optionally, in an embodiment of the present application, the sensing capacitor includes a third electrode and a fourth electrode, and the third electrode and the fourth electrode are located on the same plane to form the sensing capacitor.

Optionally, in an embodiment of the present application, the capacitive sensor further includes a second feedback branch; two ends of the second feedback branch are respectively connected with the inverting input end of the second operational amplifier and the output end of the second operational amplifier.

In a second aspect, an embodiment of the present application provides an electronic device including the living body proximity detection apparatus as described in the first aspect or any one of the embodiments of the first aspect.

Optionally, in an embodiment of the present application, the electronic device further includes an audio playing device, the audio playing device is connected to the control circuit in the living body proximity detection apparatus, and the sensing capacitor of the capacitance sensor in the living body proximity detection apparatus and the humidity sensor of the humidity sensor are located beside the audio playing device in the electronic device.

Optionally, in an embodiment of the present application, the electronic device is a headset; the earphone also comprises a loudspeaker, and the loudspeaker is connected with a control circuit in the living body approach detection device; the sensing capacitance of the capacitance sensor in the living body approach detection device and the humidity sensitive device of the humidity sensor are both positioned beside the loudspeaker in the earphone.

Optionally, in an embodiment of the present application, the electronic device is a mobile phone; the mobile phone also comprises a receiver, and the receiver is connected with a control circuit in the living body approach detection device; the sensing capacitor of the capacitance sensor and the humidity sensor of the humidity sensor are both positioned beside the listening cylinder in the mobile phone.

The living body proximity detection device and the electronic device provided by the embodiment of the application comprise: the device comprises a capacitance sensor, a humidity sensor and a control circuit, wherein the capacitance sensor and the humidity sensor are respectively connected with the control circuit; the capacitive sensor senses that a living body approaches to generate a first capacitive signal and transmits the first capacitive signal to the control circuit; the humidity sensor senses the approach of a living body to generate a first humidity signal and transmits the first humidity signal to the control circuit; a control circuit including a clock circuit, a signal receiving circuit that receives the first capacitance signal and the first humidity signal according to a clock cycle of a clock signal output by the clock circuit, and a signal detecting circuit that generates a living body approach signal according to the first capacitance signal and the first humidity signal received by the signal receiving circuit; the clock circuit is connected with the signal receiving circuit and sends a clock signal to the signal receiving circuit; the signal receiving circuit is electrically connected with the capacitance sensor and the humidity sensor and is connected with the signal detection circuit. The moisture sensor can sense the humidity increase caused by the approach of the living body, the capacitance sensor is combined to sense a first capacitance signal generated by the approach of the living body, and the humidity sensor senses a first humidity signal generated by the approach of the living body, so that the approach of the living body can be more accurately determined, the false recognition during the approach of the living body is reduced, and the accuracy of the approach of the living body is improved.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a structural diagram of a living body proximity detection apparatus according to an embodiment of the present application;

FIG. 2 is a block diagram of a humidity sensor according to an embodiment of the present disclosure;

FIG. 3 is a block diagram of another humidity sensor provided in accordance with an embodiment of the present application;

fig. 4 is a structural diagram of a capacitive sensor according to an embodiment of the present application;

FIG. 5 is a block diagram of another capacitive sensor provided in accordance with an embodiment of the present application;

fig. 6 is a block diagram of an electronic device according to an embodiment of the present disclosure;

fig. 7 is a structural diagram of an earphone according to an embodiment of the present application;

fig. 8 is a schematic view of an application scenario of an earphone according to an embodiment of the present application;

fig. 9 is a structural diagram of a mobile phone according to an embodiment of the present application;

fig. 10 is a schematic view of an application scenario of a mobile phone according to an embodiment of the present application.

Detailed Description

The embodiment of the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, fig. 1 is a structural diagram of a living body proximity detection apparatus 10 according to an embodiment of the present invention. The living body proximity detection apparatus 10 includes: the humidity sensor 101 is connected with the control circuit 103, and the humidity sensor 102 is connected with the humidity sensor 101; the capacitance sensor 101 senses the approach of a living body to generate a first capacitance signal and transmits the first capacitance signal to the control circuit 103; the humidity sensor 102 senses the approach of the living body to generate a first humidity signal and transmits the first humidity signal to the control circuit 103; a control circuit 103 including a clock circuit 1031, a signal receiving circuit 1032 that receives the first capacitance signal and the first humidity signal in accordance with a clock cycle of the clock signal output by the clock circuit 1031, and a signal detecting circuit 1033 that generates a living body approach signal in accordance with the first capacitance signal and the first humidity signal received by the signal receiving circuit 1032; the clock circuit 1031 is connected to the signal receiving circuit 1032, and the clock circuit 1031 transmits a clock signal to the signal receiving circuit 1032; the signal receiving circuit 1032 is electrically connected to the capacitance sensor 101 and the humidity sensor 102, and the signal receiving circuit 1032 is connected to the signal detecting circuit 1033.

Since the living body discharges water vapor through sweat pores and pores, the approach of the living body may cause an increase in humidity. If the change in the sensing capacitance 1011 is detected only by the capacitance sensor 101, a false recognition may be caused because the approaching object is not a living body, and if the change in humidity is detected only by the humidity sensor 102, a false recognition may be caused because the change in the air humidity. The living body approach detection device 10 of the embodiment of the application, the capacitance sensor 101 is used for sensing the approach of the living body to generate the first capacitance signal, meanwhile, the humidity sensor 102 is used for sensing the approach of the living body to generate the first humidity signal, the approach of a conductor can be determined through the first capacitance signal, the approach conductor can be determined to be the living body through the first humidity signal, the approach of the living body can be more accurately determined, the false recognition when the approach of the living body is detected is reduced, and the approach accuracy of the living body is improved.

Alternatively, in one embodiment of the present application, the capacitive sensor 101 senses the living body is far from generating the second capacitive signal, and transmits the second capacitive signal to the control circuit 103; the humidity sensor 102 senses that the living body is far away from the living body to generate a second humidity signal and sends the second humidity signal to the control circuit 103; the signal receiving circuit 1032 receives the second capacitance signal and the second humidity signal in accordance with the clock cycle of the clock signal, and the signal detecting circuit 1033 generates the living body away signal from the second capacitance signal and the second humidity signal received by the signal receiving circuit 1032. The humidity is reduced due to the fact that the living body is far away, the living body can be more accurately determined to be far away by combining the second capacitance signal generated when the capacitance sensor 101 senses the living body to be far away and the second humidity signal generated when the humidity sensor 102 senses the humidity to be reduced, false identification when the living body is far away is reduced, and the accuracy of detecting the living body to be far away is improved.

Alternatively, the living body approach signal is used to indicate that there is a living body approaching the living body approach detection device, and the living body distant signal is used to indicate that there is a living body distant from the living body approach detection device.

It should be noted that, in the present application, the first capacitance signal and the second capacitance signal may indicate the size of the detected sensing capacitance, and the capacitance increase or decrease may be determined according to the reference capacitance value; for example, if it is determined from the first capacitance signal that the capacitance value is greater than or equal to the reference capacitance value, an increase in capacitance is indicated; as another example, if the capacitance value is determined to be less than the reference capacitance value based on the second capacitance signal, a decrease in capacitance is indicated. Further, in an implementation manner, the approach of the conductor causes the capacitance to increase, it may be determined that the approach of the conductor causes the capacitance to increase when the capacitance increase is greater than or equal to a first threshold value, the capacitance value indicated by the first capacitance signal is greater than or equal to a reference capacitance value, the capacitance increase may be calculated by subtracting the reference capacitance value from the capacitance value indicated by the first capacitance signal, and if the capacitance increase is greater than or equal to the first threshold value, it is determined that the conductor approaches; the capacitance is reduced due to the fact that the conductor is far away, when the capacitance reduction amount is larger than or equal to a second threshold value, it is determined that the conductor is far away and the capacitance is reduced, the capacitance value indicated by the second capacitance signal is smaller than the reference capacitance value, the capacitance reduction amount can be calculated by subtracting the capacitance value indicated by the second capacitance signal from the reference capacitance value, and if the capacitance reduction amount is larger than or equal to the second threshold value, it is determined that the conductor is far away; or, in another implementation, the approach of the conductor causes a decrease in capacitance, a first capacitance signal is generated, a capacitance value indicated by the first capacitance signal is smaller than a reference capacitance value, the decrease of the capacitance is greater than or equal to a second threshold value, it is determined that the conductor approaches, the approach of the conductor causes an increase of the capacitance, a second capacitance signal is generated, a capacitance value indicated by the second capacitance signal is greater than or equal to the reference capacitance value, the increase of the capacitance is greater than or equal to the first threshold value, and it is determined that the conductor moves away. The first threshold and the second threshold may be the same or different, both of which may be valued according to specific situations, and may be values greater than or equal to 0.

The first and second humidity signals may indicate a detected humidity value, and an increase or decrease in humidity may be determined based on a reference humidity value, and whether a living body is approaching may be determined in combination with the first or second capacitance signal. The humidity value indicated by the first humidity signal is greater than or equal to the reference humidity value, the humidity increase can be determined according to the first humidity signal, and if the humidity increase is greater than or equal to a third threshold value, in combination with the first capacitance signal, the living body approach can be determined; the humidity value indicated by the second humidity signal is smaller than the reference humidity value, the humidity reduction can be determined according to the second humidity signal, if the humidity reduction amount is larger than or equal to a fourth threshold value, the living body can be determined to be far away by combining the second capacitance signal, the third threshold value and the fourth threshold value can be the same or different, the first threshold value and the second threshold value can be values according to specific conditions, and the third threshold value and the fourth threshold value can be values larger than or equal to 0. The first threshold, the second threshold, the third threshold and the fourth threshold are set, so that false recognition caused by micro changes of capacitance and humidity caused by environmental influences can be reduced, and the accuracy of judging the approach and/or the distance of the living body is further improved.

Alternatively, if the time difference between the reception of the first capacitance signal and the first humidity signal by the control circuit 103 is less than or equal to a preset time length, it may be determined that a living body is approaching, and if the time difference between the reception of the first capacitance signal and the first humidity signal by the control circuit 103 is greater than the preset time length, it may be determined that no living body is approaching. The preset time length may be set according to specific situations, for example, the preset time length may be n clock cycles of the clock circuit 1031, n is an integer greater than or equal to 1, and for example, the preset time length may be 1 clock cycle, or 2 or 3 clock cycles. One clock period may be set as the case may be, and for example, one clock period may be 1 second, 2 seconds, 3 seconds, or 5 seconds.

Based on the living body proximity detection apparatus 10 shown in fig. 1, specific structures of the humidity sensor 102 and the capacitance sensor 101 in the living body proximity detection apparatus 10 shown in fig. 1 will be described herein by way of two specific examples, respectively.

Optionally, in a first example, fig. 2 is a structural diagram of a humidity sensor provided in an embodiment of the present application, and as shown in fig. 2, a humidity sensor 102 includes: a humidity sensor 1021, a first drive circuit 1022, a first operational amplifier 1023; two ends of the humidity sensitive device 1021 are respectively connected with the first driving circuit 1022 and the inverting input terminal of the first operational amplifier 1023; the non-inverting input terminal of the first operational amplifier 1023 is grounded, and the output terminal of the first operational amplifier 1023 is connected to the control circuit 103. When the humidity sensing device 1021 senses that the humidity is increased, the signal input by the humidity sensing device 1021 to the inverting input terminal of the first operational amplifier 1023 changes, so that the first operational amplifier 1023 outputs a first humidity signal; when the humidity sensing device 1021 senses the humidity reduction, the signal input by the humidity sensing device 1021 to the inverting input terminal of the first operational amplifier 1023 changes, so that the first operational amplifier 1023 outputs a second humidity signal.

Optionally, in an embodiment of the present application, as shown in fig. 2, the humidity sensor 102 further includes a first feedback branch 1024; two ends of the first feedback branch 1024 are respectively connected to the inverting input terminal of the first operational amplifier 1023 and the output terminal of the first operational amplifier 1023. Optionally, as shown in fig. 2, the first feedback branch 1024 includes a first capacitor 1124 and a first resistor 1224 connected in parallel, where two ends of the first capacitor 1124 are respectively connected to the output end and the inverting input end of the first operational amplifier 1023; the first resistor 1224 is connected to the output terminal and the inverting input terminal of the first operational amplifier 1023. The first feedback branch 1024 may increase the stability of the output signal of the humidity sensor 102.

Alternatively, in an embodiment of the present application, the humidity sensitive device 1021 may be a capacitive humidity sensitive device 1021 or a resistive humidity sensitive device 1021, where the capacitive humidity sensitive device 1021 is taken as an example for illustration, as shown in fig. 3, the humidity sensitive device 1021 includes a first electrode 1121, a second electrode 1221, and a shielding metal mesh 1321 disposed outside the first electrode 1121 and the second electrode 1221. When the humidity sensor 1021 senses an increase in humidity, the dielectric constant between the first electrode 1121 and the second electrode 1221 increases due to the increase in humidity, which causes the equivalent capacitance to increase, so that the voltage of the signal output by the first operational amplifier 1023 increases, that is, the first humidity signal is output; when the humidity sensing device 1021 senses a decrease in humidity, the first electrode 1121 and the second electrode 1221 decrease in dielectric constant due to the decrease in humidity, resulting in a decrease in equivalent capacitance, so that the signal voltage output by the first operational amplifier 1023 decreases, that is, a second humidity signal is output. It should be noted that the shielding metal mesh 1321 can allow air to enter between the first electrode 1121 and the second electrode 1221, so that humidity change can be sensed, and the shielding metal mesh 1321 can shield the electric field, thereby preventing the electric field from affecting humidity sensing and improving accuracy of proper sensing.

Optionally, in a second example, fig. 4 is a structural diagram of a capacitive sensor provided in an embodiment of the present application, and as shown in fig. 4, a capacitive sensor 101 includes: a sensing capacitor 1011, a second driving circuit 1012, and a second operational amplifier 1013; the two ends of the sensing capacitor 1011 are respectively connected to the inverting input terminals of the second driving circuit 1012 and the second operational amplifier 1013; the non-inverting input terminal of the second operational amplifier 1013 is grounded, and the output terminal of the second operational amplifier 1013 is connected to the control circuit 103. It should be noted that the capacitive sensor may be a mutual capacitance sensor, when a living body approaches, the electric field lines of the sensing capacitor 1011 are blocked by the living body, resulting in a decrease in the equivalent capacitance, and thus causing a decrease in the signal voltage output by the output end of the second operational amplifier 1013, that is, outputting the first capacitance signal; when the living body is far away, the equivalent capacitance of the sensing capacitor 1011 increases, causing the signal voltage output from the output terminal of the second operational amplifier 1013 to increase, i.e., outputting the second capacitance signal.

Optionally, in an embodiment of the present application, as shown in fig. 4, the capacitive sensor 101 further comprises a second feedback branch 1014; the two ends of the second feedback branch 1014 are connected to the inverting input terminal of the second operational amplifier 1013 and the output terminal of the second operational amplifier 1013, respectively. Optionally, as shown in fig. 4, the second feedback branch 1014 includes a second capacitor 1114 and a second resistor 1214, which are connected in parallel, and two ends of the second capacitor 1114 are respectively connected to the output end and the inverting input end of the second operational amplifier 1013; the second resistor 1214 has two ends connected to the output end and the inverting input end of the second operational amplifier 1013, respectively. The second feedback branch 1014 may increase the stability of the output signal of the capacitive sensor 101.

Optionally, in an embodiment of the present application, the sensing capacitor 1011 includes a third electrode 1111 and a fourth electrode 1211, and the third electrode 1111 and the fourth electrode 1211 are located on the same plane to form the sensing capacitor 1011. As shown in fig. 5, the external surfaces of the third electrode 1111 and the fourth electrode 1211 are in the same plane, so that the opening of the formed electric field is better, and the approach or the distance of the conductor can be more easily detected.

The living body approaching detection device provided by the embodiment of the application combines the capacitance sensor to sense the first capacitance signal generated by the approaching of the living body and the humidity sensor to sense the first humidity signal generated by the approaching of the living body, so that the approaching of the living body can be more accurately determined, the false identification when the living body is detected to approach is reduced, and the accuracy of the approaching of the living body is improved.

Based on the living body proximity detection apparatus 10 described in the above embodiments, the present embodiment provides an electronic device, as shown in fig. 6, the electronic device 20 including the living body proximity detection apparatus 10 described in any embodiment of the present invention; the electronic device 20 further comprises an audio playing device 201, the audio playing device 201 is connected to the control circuit 103 of the living body proximity detection apparatus 10, and the sensing capacitor 1011 of the capacitance sensor 101 and the humidity sensor 1021 of the humidity sensor 102 of the living body proximity detection apparatus 10 are located beside the audio playing device 201 of the electronic device.

It should be noted that, the vicinity of the audio playing device 201 may be an area within a preset distance from the audio playing device, the preset distance may be set according to specific situations, and may be 5 mm or 10 mm, and the vicinity of the audio playing device 201 may also be said to be the vicinity of the audio playing device 201, or the area where the audio playing device 201 is located. When a living body approaches or leaves the audio playing device 201, the sensing capacitor 1011 is caused to change, and the humidity sensor 1021 detects the humidity change, so that whether the living body approaches or leaves the audio playing device 201 can be identified more accurately. The living body approach signal output by the living body approach detection apparatus 10 may control the audio playback device 201 to play back the audio data, and the living body away signal may control the audio playback device 201 to stop playing back the audio data.

Alternatively, in an embodiment of the present application, the electronic device 20 may be an earphone 30, as shown in fig. 7, the earphone 30 further includes a speaker 301, and the speaker 301 is electrically connected to the living body proximity detection apparatus 10; the sensing capacitor 1011 of the capacitance sensor 101 and the humidity sensor 1021 of the humidity sensor 102 in the living body proximity detection apparatus 10 are both located near the speaker 301 in the earphone 30.

It should be noted that, the side of the speaker 301 may be an area within a preset distance from the audio playing device, the preset distance may be set according to specific situations, and may be 5 mm or 10 mm, and the side of the speaker 301 may also be an area near the speaker 301 or where the speaker 301 is located. When a living body approaches or leaves the loudspeaker 301, the sensing capacitor 1011 is caused to change, and the humidity sensor 1021 detects the humidity change, so that whether the living body approaches or leaves the loudspeaker 301 can be identified more accurately.

Alternatively, in one embodiment of the present application, the earphone 30 is an in-ear earphone 30, and the sensing capacitor 1011 of the living body proximity detection apparatus 10 and the humidity sensitive device 1021 of the living body proximity detection apparatus 10 are located in an in-ear region of the earphone 30. The in-ear area of the in-ear earphone 30 is placed in the ear when the user wears the earphone 30, and the sensing capacitor 1011 and the humidity sensor 1021 are arranged in the in-ear area, so that whether the user wears the earphone 30 can be identified more accurately. Here, a specific application scenario is listed for detailed description, and optionally, as shown in fig. 8, fig. 8 is a schematic view of an application scenario of the headset 30 according to an embodiment of the present application. Fig. 8 shows an earphone 30 and a living body 31, in this application scenario, the living body 31 may be an ear of a human body, in the earphone 30 shown in fig. 8, a capacitance sensor 101 and a humidity sensor 102 are disposed inside the earphone 30, and a sensing capacitor 1011 of the capacitance sensor 101 and a humidity sensor 1021 of the humidity sensor 102 are located in an ear entering area of the earphone 30, when a user wears the earphone 30, because the human body approaches the earphone 30, a first change occurs in the sensing capacitor 1011 to cause the capacitance sensor 101 to output a first capacitance signal, and simultaneously, because the humidity increases to cause the humidity sensor 102 to output a first humidity signal, and when receiving the first capacitance signal and the first humidity signal, a control circuit 103 of the earphone 30 generates a living body approach signal, and plays audio data through the earphone 30. When the user takes off the earphone 30, the capacitance sensor 101 outputs a second capacitance signal due to the second change of the sensing capacitor 1011, and the humidity sensor 102 outputs a second humidity signal due to the reduction of the humidity, so that the control circuit 103 of the earphone 30 generates a living body away signal when receiving the second capacitance signal and the second humidity signal, and controls the earphone 30 to stop playing the audio data. If it is determined whether the user wears the earphone 30 only according to the variation of the sensing capacitance 1011 of the capacitance sensor 101, the situation causing the variation of the sensing capacitance 1011 is too many, so that the false recognition may occur, for example, when the earphone 30 is placed on a conductive desktop such as metal, or a conductive object is close to the periphery, it may be determined that the user wears the earphone 30. In this application scenario, because the sweat pores and pores of the skin of the human body can discharge water vapor, when the change of the inductive capacitor 1011 is detected, whether a living body is approaching can be more accurately determined in combination with the change of the humidity, and in this application scenario, whether a human body is approaching can be determined, so that the earphone 30 can be more accurately controlled to play audio data.

The earphone that this application embodiment provided combines the first capacitance signal that capacitive sensor sensing living body was close to produced to and humidity transducer sensing living body is close to the first humidity signal that produces and can confirm more accurately that there is the living body to be close, has reduced the mistake discernment when detecting the living body and being close to, has improved the degree of accuracy that detects the living body and close to.

Alternatively, in an embodiment of the present application, the electronic device 20 may be a mobile phone 40, as shown in fig. 9, the mobile phone 40 further includes an earphone 401, and the earphone 401 is connected to the control circuit 103 in the living body proximity detection apparatus 10; the sensing capacitor 1011 of the capacitance sensor 101 and the humidity sensor 1021 of the humidity sensor 102 are located beside the earpiece 401 in the handset 40.

It should be noted that, the area near the earpiece 401 may be within a preset distance from the audio playing device, the preset distance may be set according to specific situations, and may be 5 mm, 10 mm, or 15 mm, 20 mm, and the area near the earpiece 401 or the area where the earpiece 401 is located may also be referred to as near the earpiece 401. When a living body approaches or leaves the earphone 401, the sensing capacitor 1011 is caused to change, and the humidity sensor 1021 detects the humidity change, so that whether the living body approaches or leaves the earphone 401 can be identified more accurately.

Optionally, as shown in fig. 9, the cell phone 40 further includes a display screen 402; the handset 401, the sensing capacitor 1011 and the humidity sensitive device 1021 are located at the same end of the display 402. Because the earpiece 401, the sensing capacitor 1011 and the humidity sensitive device 1021 are located at the same end of the display 402, it is possible to more accurately identify whether a living body is approaching the earpiece 401. Here, a specific application scenario is taken for explanation, and as shown in fig. 10, fig. 10 is a schematic view of an application scenario of a mobile phone according to an embodiment of the present application. Fig. 10 shows a cell phone 40 and a living body 41, in this application scenario, the living body 41 may be an ear of a human body. The sensing capacitor 1011 of the capacitive sensor 101 and the humidity sensor 1021 of the humidity sensor 102 can be arranged near the earphone 401 of the mobile phone 40, when a user brings ears close to the earphone 401 of the mobile phone 40, because a human body approaches the earphone 401 of the mobile phone 40, the sensing capacitor 1011 generates a first change to enable the capacitive sensor 101 to output a first capacitive signal, and simultaneously because humidity is increased to enable the humidity sensor 102 to output a first humidity signal, when the control circuit 103 obtains the first capacitive signal and the first humidity signal, a living body approach signal is generated, the mobile phone 40 plays audio data through the earphone 401, and the screen is turned off. When the user moves the ear away from the earpiece 401 of the mobile phone 40, the capacitance sensor 101 outputs a second capacitance signal due to the second change of the sensing capacitance 1011, and the humidity sensor 102 outputs a second humidity signal due to the reduction of the humidity, the control circuit 103 generates a living body away signal when obtaining the second capacitance signal and the second humidity signal, and the mobile phone 40 switches from the earpiece 401 to the speaker 301 to play audio data and lights up the screen.

The cell-phone that this application embodiment provided combines the first capacitance signal that capacitive sensor sensing living body is close to produced to and humidity transducer sensing living body is close to the first humidity signal that produces and can confirm more accurately that there is the living body to be close, has reduced the false recognition when detecting the living body and being close to, has improved the degree of accuracy that detects the living body and close to.

Thus, particular embodiments of the present subject matter have been described. Other embodiments are within the scope of the following claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may be advantageous.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (11)

1. A living body approach detection device, comprising: a capacitance sensor, a humidity sensor and a control circuit;

the capacitance sensor and the humidity sensor are respectively connected with the control circuit;

the capacitance sensor senses a first capacitance signal generated by approach of a living body and transmits the first capacitance signal to the control circuit;

the humidity sensor senses a first humidity signal generated by the approach of the living body and transmits the first humidity signal to the control circuit;

the control circuit comprises a clock circuit, a signal receiving circuit for receiving the first capacitance signal and the first humidity signal according to the clock period of the clock signal output by the clock circuit, and a signal detection circuit for generating a living body approach signal according to the first capacitance signal and the first humidity signal received by the signal receiving circuit; the clock circuit is connected with the signal receiving circuit and sends a clock signal to the signal receiving circuit; the signal receiving circuit is electrically connected with the capacitance sensor and the humidity sensor, and is connected with the signal detection circuit.

2. The living body proximity detection device according to claim 1, wherein the humidity sensor includes: the humidity sensitive device, the first driving circuit and the first operational amplifier;

two ends of the humidity sensitive device are respectively connected with the first driving circuit and the inverting input end of the first operational amplifier;

the positive phase input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is connected with the control circuit.

3. The living body proximity detection device according to claim 2, wherein the humidity sensor further comprises a first feedback branch; and two ends of the first feedback branch are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.

4. The living body proximity detection apparatus according to claim 3, wherein the humidity sensitive device includes a first electrode, a second electrode, and a shielding metal mesh provided outside the first electrode and the second electrode.

5. The living body proximity detection device according to claim 1, wherein the capacitance sensor includes: the inductive capacitor, the second drive circuit and the second operational amplifier;

two ends of the induction capacitor are respectively connected with the second driving circuit and the inverting input end of the second operational amplifier;

the positive phase input end of the second operational amplifier is grounded, and the output end of the second operational amplifier is connected with the control circuit.

6. The living body proximity detection device according to claim 5,

the sensing capacitor comprises a third electrode and a fourth electrode, and the third electrode and the fourth electrode are located on the same plane to form the sensing capacitor.

7. The living body proximity detection device of claim 6, wherein the capacitive sensor further comprises a second feedback branch; and two ends of the second feedback branch are respectively connected with the inverting input end of the second operational amplifier and the output end of the second operational amplifier.

8. An electronic apparatus characterized by comprising the living body proximity detection device according to any one of claims 1 to 7.

9. The electronic device according to claim 8, wherein the electronic device further comprises an audio playing device, the audio playing device is connected to the control circuit in the living body proximity detection apparatus, and the sensing capacitor of the capacitance sensor in the living body proximity detection apparatus and the humidity sensor of the humidity sensor are located beside the audio playing device in the electronic device.

10. The electronic device of claim 8, wherein the electronic device is a headset;

the earphone further comprises a loudspeaker which is connected with a control circuit in the living body proximity detection device; the sensing capacitor of the capacitance sensor in the living body approach detection device and the humidity sensor of the humidity sensor are both positioned beside the loudspeaker in the earphone.

11. The electronic device of claim 8, wherein the electronic device is a cell phone;

the mobile phone also comprises a receiver, the receiver is connected with a control circuit in the living body approach detection device, and the induction capacitor of the capacitor sensor and the humidity sensor of the humidity sensor are both positioned beside the receiver in the mobile phone.

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