Space capacitance face induction electric shaver

Abstract

The utility model relates to the technical field of shavers, in particular to a space capacitance face induction electric shaver. In order to solve the problems that when the shaver gets close to the human face, the induction capacitance is increased, and when the shaver leaves the human face, the induction capacitance is reduced, but for an alloy shaver or a conductive shell with the shell surface subjected to electroplating treatment containing a metal coating for attractiveness, the shaver is difficult to implement, the following technical scheme is provided: the shaver comprises a shaver body; the space capacitor Cx comprises a shaver net cover installed at the head of the shaver body and a conductive shell installed on the outer side of the holding part of the shaver, the space capacitor Cx further comprises a ground wire connecting terminal connected with the shaver net cover, one end of the ground wire connecting terminal is connected with a capacitance-voltage conversion circuit, and the other end of the ground wire connecting terminal is connected with the conductive shell. And the sampling measurement terminal is connected with the conductive shell. According to the intelligent face induction type shaver, the intelligent face induction opening and leaving closing functions of the conductive shell type shaver are achieved under the condition that the structural appearance of the shell is not changed, the appearance is attractive, and meanwhile use convenience is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of shavers, in particular to a space capacitance human face induction electric shaver. Background Art

[0002] An electric shaver is a tool that people use to shave, and is usually activated by a mechanical switch set on the body. When in use, it is necessary to press the mechanical switch to start and stop the shaver. For ease of use, in recent years, many electric shavers that use a blade mesh cover or add metal touch electrodes to the structure as capacitive sensing sensors have appeared on the market. They can be turned on and off by touching the skin. The principle of this single metal capacitive sensing solution is achieved by detecting the change in the induced capacitance between the human body and the circuit ground of the shaver system. That is, when the shaver is close to the face, the induced capacitance increases, and when it is away, it decreases. However, this is more difficult to achieve for shavers made of alloys or conductive shells that have been electroplated with a metal coating on the surface for aesthetic purposes, because most of the induced capacitance of the human body to the circuit ground is isolated by the conductive shell. In view of this, the utility model proposes a spatial capacitance face sensing electric shaver. Utility Model Content

[0003] The purpose of the utility model is to address the problem in the background technology that the induction capacitance increases when the shaver is close to the face and decreases when it is away from the face, but this is difficult to achieve for shavers with conductive shells made of alloy or with the shell surface electroplated with a metal coating for aesthetic purposes. A space capacitance face-sensing electric shaver is proposed.

[0004] The technical solution of the present utility model is as follows: a spatial capacitance face-sensing electric shaver, comprising a shaver body; a spatial capacitor Cx, wherein the spatial capacitor Cx comprises a mesh cover mounted on the head of the shaver body, and a conductive shell mounted on the outside of the shaver gripping portion; the spatial capacitor Cx also comprises a ground connection terminal connected to the mesh cover, one end of the ground connection terminal being connected to a capacitance-voltage conversion circuit, and a sampling and measurement terminal connected to the conductive shell, wherein the sampling and measurement terminal is connected to the ground connection terminal; and a single-chip microcomputer, wherein the output end of the single-chip microcomputer is connected to a sampling capacitor, and the sampling capacitor is connected to the sampling and measurement terminal.

[0005] Optionally, the sampling and measuring terminal is further connected to an analog-to-digital converter, and the output end of the analog-to-digital converter is connected to the input end of the single-chip microcomputer.

[0006] Optionally, the knife mesh cover and the conductive shell are insulated from each other.

[0007] Optionally, the output end of the single chip microcomputer is connected to a motor driver, and one end of the motor driver is connected to a motor.

[0008] In summary, this application includes at least one of the following beneficial technical effects:

[0009] The utility model sets a space capacitor Cx and detects the change in the size of the space capacitor Cx to determine whether a face is close to the razor head. The AC square wave signal sent by the single-chip microcomputer passes through the sampling capacitor and the space capacitor Cx to the ground to form a series voltage-divided signal, performs analog-to-digital conversion, and reads the result. The single-chip microcomputer can determine whether a face is close based on the reading result, thereby realizing an intelligent face sensing function.

[0010] In summary, the present invention realizes the intelligent face sensing opening and closing functions of the conductive shell type shaver without changing the structure and appearance of the shell, and has an attractive appearance while enhancing the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the face sensing detection principle disclosed in this utility model;

[0012] Figure 2 This is a functional block diagram of an electric shaver according to an embodiment of the present invention.

[0013] Reference numerals:

[0014] 1. Knife mesh cover; 2. Conductive shell; 3. Sampling capacitor; 4. Sampling measurement terminal; 5. Ground connection terminal; 6. Analog-to-digital converter; 7. Microcontroller; 8. Motor driver; 9. Motor. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0016] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0018] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0020] Example 1

[0021] like Figure 1 and Figure 2 As shown, the utility model proposes a space capacitance face sensing electric shaver, which includes a shaver body for realizing the basic functions of the shaver.

[0022] It is worth mentioning that the above-mentioned shaver includes a spatial capacitor Cx, which includes a blade mesh cover 1 installed on the head of the shaver body. The blade mesh cover 1 first comes into contact with the human body when the shaver is shaving. And a conductive shell 2 installed on the outside of the grip of the shaver. When using the shaver, the hand first comes into contact with the conductive shell 2. The blade mesh cover 1 and the conductive shell 2 are insulated from each other, so that a capacitor is formed after the blade mesh cover 1 and the conductive shell 2 are connected through a line. The spatial capacitor Cx also includes a ground connection terminal 5 connected to the blade mesh cover 1, one end of the ground connection terminal 5 is connected to a capacitance-voltage conversion circuit, and a sampling and measurement terminal 4 connected to the conductive shell 2. The sampling and measurement terminal 4 is connected to the ground connection terminal 5 and is used to generate capacitance at the position of the blade mesh cover 1 and the conductive shell 2.

[0023] Furthermore, the shaver includes a single-chip microcomputer 7, the output of which is connected to a sampling capacitor 3, which is connected to a sampling and measurement terminal 4. The sampling capacitor 3 and the space capacitor Cx are connected in series. The AC square wave signal output by the single-chip microcomputer 7 passes through the sampling capacitor 3 and the space capacitor Cx to ground. The series AC divided voltage signal generated at the sampling and measurement terminal 4 is equal to Cs / (Cs+Cx)*AC signal voltage. When a person shaves with the shaver, Cx increases, and the series divided voltage signal at the sampling and measurement terminal 4 decreases.

[0024] Furthermore, the sampling and measurement terminal 4 is connected to an analog-to-digital converter 6, the output of which is connected to the input of a single-chip microcomputer 7. The analog-to-digital converter 6 is used to convert the increase or decrease in the voltage signal into a digital form and then read it into the single-chip microcomputer 7 for processing to determine whether a human face is approaching.

[0025] Finally, the output end of the single-chip microcomputer 7 is connected to a motor driver 8, and one end of the motor driver 8 is connected to a motor 9. The motor driver 8 receives the motor start and stop drive control signal generated by the single-chip microcomputer 7 and controls the motor 9 to start and stop, thereby completing the intelligent face sensing electric shaver function.

[0026] In this embodiment, when a person holds the razor in his hand to shave, the space capacitance Cx increases, and the series divided voltage signal on the sampling and measuring terminal 4 decreases. After analog-to-digital conversion by the analog-to-digital converter 6, it is read into the microcontroller 7 for processing to determine whether there is a human face close to it, and then a motor start-stop drive control signal is generated and output to the motor driver 8 to control the start and stop action of the motor 9, thereby completing the electric shaver function of intelligent face sensing.

[0027] Example 2

[0028] like Figure 1 and Figure 2 As shown, based on Example 1, the knife mesh cover 1 is connected to the sampling and measurement terminal 4, and the conductive shell 2 is grounded to realize the measurement of the space capacitance formed between the knife mesh cover 1 and the conductive shell 2. The whole principle and working process are the same as Example 1.

[0029] While this embodiment is nearly identical to the first embodiment, with the mesh cover 1 connected to ground and the conductive housing 2 connected to the sampling and measurement terminals 4 swapped, there are slight hardware differences in performance. The first embodiment is more effective in preventing false sensing caused by water splashes because the mesh cover 1 is grounded. However, connecting the mesh cover 1 to the sampling and measurement terminals 4 and the conductive housing 2 to ground results in improved facial sensitivity.

[0030] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art may make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A space capacitance face sensing electric shaver, characterized in that: include: razor body; A space capacitor Cx, the space capacitor Cx comprising a mesh cover (1) mounted on the head of the shaver body, and a conductive shell (2) mounted outside the grip portion of the shaver, the space capacitor Cx further comprising a ground connection terminal (5) connected to the mesh cover (1), one end of the ground connection terminal (5) being connected to a capacitance-voltage conversion circuit, and a sampling and measuring terminal (4) connected to the conductive shell (2), the sampling and measuring terminal (4) being connected to the ground connection terminal (5); A single-chip microcomputer (7), wherein the output end of the single-chip microcomputer (7) is connected to a sampling capacitor (3), and the sampling capacitor (3) is connected to a sampling measurement terminal (4).

2. The space capacitance face sensing electric shaver according to claim 1, characterized in that: The sampling and measuring terminal (4) is also connected to an analog-to-digital converter (6), and the output end of the analog-to-digital converter (6) is connected to the input end of the single-chip computer (7).

3. The space capacitance face sensing electric shaver according to claim 2, characterized in that: The knife mesh cover (1) and the conductive housing (2) are insulated from each other.

4. The space capacitance face sensing electric shaver according to claim 3, characterized in that: The output end of the single chip microcomputer (7) is connected to a motor driver (8), and one end of the motor driver (8) is connected to a motor (9).

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