Ultrasonic head contact detection circuit and ultrasonic beauty instrument

Abstract

The ultrasonic head contact detection circuit comprises an operational amplifier, a first contact and a second contact, the first contact and the second contact are installed on the surface of an ultrasonic head, the positive phase input end of the operational amplifier is connected with a power source end, the negative phase input end of the operational amplifier is connected with the first contact, and the output end of the operational amplifier is connected with a controller. A divider resistor is bridged between the positive phase input end and the negative phase input end of the operational amplifier, and the second contact is grounded. When the ultrasonic beauty instrument works, if the contact between the ultrasonic head and the skin is interrupted, the first contact and the second contact on the ultrasonic head are not in contact with the skin, so that the connection between the first contact and the second contact is disconnected, the divider resistor cannot form a voltage division circuit with the skin, and the positive phase input end voltage of the operational amplifier is not higher than the negative phase input end voltage; if the contact signal is not received, the output end of the operational amplifier cannot output the contact signal to the controller, and the controller can feed back the contact interruption condition to an operator in real time through the display device when the contact signal is not received.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ultrasonic beauty instrument, especially relates to an ultrasonic head contact detection circuit and ultrasonic beauty instrument. BACKGROUND

[0002] The ultrasonic beauty instrument is a kind of beauty equipment for skin care using ultrasonic technology, and its core components usually include ultrasonic head, boost circuit, power management module etc., ultrasonic head is internally provided with ultrasonic transducer, and ultrasonic head emits high-frequency sound wave to skin deep layer through ultrasonic transducer, to achieve cleaning, tightening, anti-aging, absorption promotion etc.

[0003] When working, ultrasonic beauty instrument needs to keep ultrasonic head and skin in stable contact to realize efficient high-frequency sound wave conduction, but in actual operation process, ultrasonic head needs to be frequently moved to cover different treatment sites, and during moving operation, ultrasonic head and skin contact can be interrupted due to uneven pressure or angle deviation.This unexpected contact interruption not only reduces sound wave conduction efficiency, affects treatment effect, but also can cause equipment idling operation, and there are potential safety hazards. UTILITY MODEL CONTENT

[0004] The utility model provides a circuit that can detect the contact of ultrasonic head with skin in real time.

[0005] To solve the above technical problems, the utility model provides an ultrasonic head contact detection circuit, including operational amplifier, first contact and second contact installed on the surface of ultrasonic head, the positive input end of operational amplifier is connected with power supply end, the negative input end is connected with first contact, and the output end is connected with controller, and the positive input end and the negative input end of operational amplifier are crossed with voltage dividing resistor, and the second contact is grounded.

[0006] Further, the first contact and the second contact are metal conductive sheets, and are symmetrically arranged on the edge of the working end surface of the ultrasonic head.

[0007] Further, the output end of the operational amplifier is connected to the controller through an AD conversion module.

[0008] The utility model also provides an ultrasonic beauty instrument, which comprises an ultrasonic head, a controller and the above-mentioned ultrasonic head contact detection circuit, and the ultrasonic head is internally provided with an ultrasonic transducer.

[0009] Further, the controller is connected to a gyroscope sensor.

[0010] Further, the controller is an MCU controller.

[0011] Further, the controller is connected to a gyroscope sensor.

[0012] The utility model has the following beneficial effects: when the ultrasonic beauty instrument is working, the operator contacts the ultrasonic head with the skin, the first contact point and the second contact point on the ultrasonic head contact the skin, the skin acts as a short-circuit wiring to connect the first contact point and the second contact point, so that the voltage of the positive input end of the operational amplifier is higher than that of the negative input end, the output end of the operational amplifier outputs a contact signal to the controller, and the controller can feed back the good contact condition to the operator in real time through the display device according to the contact signal. When the ultrasonic head is interrupted in contact with the skin, the first contact point and the second contact point on the ultrasonic head do not contact the skin, the connection between the first contact point and the second contact point is disconnected, so that the voltage of the positive input end of the operational amplifier is not higher than that of the negative input end, the output end of the operational amplifier cannot output a contact signal to the controller, and the controller can feed back the contact interruption condition to the operator in real time through the display device when no contact signal is received. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a circuit principle drawing of the ultrasonic head contact detection circuit.

[0014] Figure 2 It is a circuit principle drawing of the gyroscope sensor. DETAILED DESCRIPTION

[0015] The application will be further described in detail in combination with the specific embodiments.

[0016] The embodiment provides an ultrasonic beauty instrument, which comprises an ultrasonic head, a controller, an ultrasonic head contact detection circuit and a display device, the ultrasonic head is internally provided with an ultrasonic transducer, the controller is specifically an MCU controller, and the display device is connected with the controller. Figure 1 As shown in the figure, the ultrasonic head contact detection circuit comprises an operational amplifier U3, a first contact point TP1 and a second contact point TP2, wherein the first contact point TP1 and the second contact point TP2 are metal conductive sheets which are symmetrically arranged at the edge of the working end face of the ultrasonic head and are installed on the surface of the ultrasonic head, the positive input end of the operational amplifier U3 is connected with a power supply end VCC_5V, the negative input end is connected with the first contact point TP1, the output end is connected with the signal input end of the controller after passing through the AD conversion module through the contact point TOUCH, and the positive input end and the negative input end of the operational amplifier U3 are connected with a voltage dividing resistor R1, and the second contact point TP2 is grounded.

[0017] When the ultrasonic cosmetic instrument is working, the ultrasonic transducer inside the ultrasonic head emits ultrasonic waves, and the operator contacts the ultrasonic head with the skin, so that the first contact point TP1 and the second contact point TP2 on the surface of the ultrasonic head contact the skin, and the skin acts as a short-circuit wire to connect the first contact point TP1 and the second contact point TP2, so that the voltage at the positive input terminal of the operational amplifier U3 is higher than that at the negative input terminal, and the output terminal of the operational amplifier U3 outputs a contact signal to the controller through the contact point TOUCH, and the controller can feed back the good contact condition to the operator in real time through the display device. When the ultrasonic head is moving, the ultrasonic head is disconnected from the skin due to uneven pressure or angle deviation, the first contact point TP1 and the second contact point TP2 on the surface of the ultrasonic head do not contact the skin, so that the connection between the first contact point TP1 and the second contact point TP2 is disconnected, and the voltage at the positive input terminal of the operational amplifier U3 is not higher than that at the negative input terminal, so that the output terminal of the operational amplifier U3 cannot output a contact signal to the controller, and the controller U1 can feed back the disconnection condition to the operator in real time through the display device, so that the operator can adjust the position and angle of the ultrasonic head in time according to the disconnection condition, and ensure that the ultrasonic head keeps in contact.

[0018] In the embodiment, a gyroscope sensor is arranged on the handle of the ultrasonic cosmetic instrument, and the signal output terminal of the gyroscope sensor is connected to the controller. Figure 2 During the working process of the ultrasonic cosmetic instrument, the controller detects the movement of the ultrasonic head through the gyroscope sensor U1.

[0019] The above description is only an embodiment of the application, and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions on the basis of the application, and still fall within the scope of patent protection.

Claims

1. An ultrasonic head contact detection circuit, characterized in that, It includes an operational amplifier, a first contact and a second contact mounted on the surface of the ultrasonic head. The positive input terminal of the operational amplifier is connected to the power supply terminal, the negative input terminal is connected to the first contact, and the output terminal is connected to the controller. A voltage divider resistor is connected between the positive input terminal and the negative input terminal of the operational amplifier, and the second contact is grounded.

2. The ultrasonic head contact detection circuit according to claim 1, characterized in that, The first and second contacts are metal conductive sheets, symmetrically arranged on the edge of the working end face of the ultrasonic head.

3. The ultrasonic head contact detection circuit according to claim 1, characterized in that, The output of the operational amplifier is connected to the controller via an AD conversion module.

4. An ultrasonic beauty device, characterized by: It includes an ultrasonic head, a controller, and an ultrasonic head contact detection circuit as described in any one of claims 1 to 3, wherein the ultrasonic head is provided with an ultrasonic transducer.

5. The ultrasonic beauty device according to claim 4, characterized in that, Includes a display device, which is connected to the controller.

6. The ultrasonic beauty device according to claim 4, characterized in that, The controller is an MCU controller.

7. The ultrasonic beauty device according to claim 4, characterized in that, This includes a gyroscope sensor connected to the controller.

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