A device for skin care that generates high-frequency pulses and applies them to the skin, comprising:
- a main body;
- and
- a handpiece connected to the main body to apply high-frequency pulses to the skin,
- wherein the main body includes:
- a power supply unit for supplying power to the device;
- a high-frequency signal generator for generating a high-frequency signal to be applied to the skin;
- an adjustment unit for determining an adjustment of an output of high frequency signal generator;
- and
- a controller for controlling an operation of the device and the output of high-frequency pulses in response to the adjustment determined by the adjustment unit,
- the adjustment unit includes:
- a high frequency output time adjusting unit for determining an adjustment of a time period for outputting high frequency (RF) to be applied to the skin;
- a high frequency pulse number adjusting unit for determining an adjustment of the number of pulses in the range of 1 to N (N is a natural number);
- a high frequency output intensity adjusting unit for determining an adjustment of the intensity of the output of high-frequency (RF);
- a high-frequency frequency adjusting unit for determining an adjustment of a high-frequency (RF) frequency;
- a high frequency pulse width adjusting unit for determining an adjustment of the width of a high frequency (RF) pulse;
- a needle length adjusting unit for determining an adjustment of a length of a needle to be inserted into the skin, the needle being mounted on the handpiece;
- and
- a high-frequency waveform output unit for determining a pulse waveform according to the adjustment determined by the high frequency output time adjusting unit and the high frequency pulse number adjusting unit,
- wherein each pulse of the pulse waveform has On time and Off time, the On time is a time period when pulse waveform is output, and the Off time is a time period when no pulse waveform is output;
- wherein when the selected number of pulses is 1, a time period of the On time is identical with the time period for outputting high frequency (RF), and Off time follows after the On time,
- wherein when the selected number of pulses is any one of 2 to N, the On time and the Off time are alternately repeated based on the number of pulses during the time period for outputting high frequency (RF), so that a desired high-frequency pulse is applied to the skin during the On time, and
- wherein when the selected number of pulses is any one of 2 to N, the time period of the On time is determined by Equation 1 and the time period of the Off time is determined by Equation 2.
- On time=[TRF Time×{(10−Pulse+1)×10}÷100]÷Pulse (Equation 1)
- Off time=[TRF Time×{(Pulse−1)×10}÷100]÷Pulse, (Equation 2)
- wherein the TRF Time denotes the time period for outputting high frequency (RF), and the Pulse denotes the selected number of high frequency pulses.