Hand piece for skin treatment apparatus
Provided is a hand piece for a skin treatment apparatus, the hand piece including: a hand piece body capable of being operated by a user hand; a skin treatment unit connected to an end of the hand piece body, and treating a user skin; a pressure sensing unit installed on the skin treatment unit, and sensing a pressure between the skin and the skin treatment unit; and a pressure display unit emitting light in a plurality of colors based on a pressure value measured by the pressure sensing unit.
1. A hand piece for a skin treatment apparatus, the hand piece comprising:
a hand piece body capable of being operated by a user hand;
a skin treatment unit connected to an end of the hand piece body, and treating a user skin;
a pressure sensing unit installed on the skin treatment unit, and sensing a pressure between the skin and the skin treatment unit; and
a pressure display unit emitting light in a plurality of colors corresponding to respective ranges of on a pressure value measured by the pressure sensing unit,
wherein the pressure sensing unit includes a plurality of elastic assemblies change in length in response to the pressure at which the skin treatment unit presses on the skin,
wherein the elastic assembly includes
an upper elastic body adjacent to the skin treatment unit,
a lower elastic body adjacent to the hand piece body, and
an intermediate elastic body disposed between the upper elastic body and the lower elastic body, and
wherein an elastic modulus of the intermediate elastic body is within a predetermined pressure reference range,
an elastic modulus of the upper elastic body is below the predetermined pressure reference range, and
an elastic modulus of the lower elastic body is above the predetermined pressure reference range.
2. The hand piece of claim 1 , wherein
the plurality of elastic assemblies are installed between the hand piece body and the skin treatment unit.
3. The hand piece of claim 2 , wherein
the elastic assembly includes a multi-stage pogo pin including
an upper pogo pin adjacent to the skin treatment unit,
a lower pogo pin adjacent to the hand piece body, and
an intermediate pogo pin disposed between the upper pogo pin and the lower pogo pin, and
the upper elastic body, the intermediate elastic body, and the lower elastic body are mounted on the upper pogo pin, the intermediate pogo pin, and the lower pogo pin, respectively.
4. The hand piece of claim 2 , wherein
the pressure display unit
emits light in the plurality of colors as the length of the elastic assembly is changed.
5. The hand piece of claim 4 , further comprising
a control unit controlling the pressure display unit by transmitting, to the pressure display unit, a control signal in response to on a length change of the elastic assembly.