Mask, and skin care apparatus comprising same
A mask according to an embodiment comprises: a first substrate disposed on a first base layer; a first wire disposed on the first substrate; a piezoelectric element disposed on the first wire; a second wire disposed on the piezoelectric element; a second substrate disposed on the second wire; a second base layer disposed on the second substrate; and a cavity disposed between the first base layer and the piezoelectric element, wherein the cavity is disposed in a region overlapping the piezoelectric element in a vertical direction.
1 . A mask comprising:
a first substrate disposed on a first base layer;
a first wire disposed on the first substrate;
a piezoelectric element disposed on the first wire;
a second wire disposed on the piezoelectric element;
a second substrate disposed on the second wire;
a second base layer disposed on the second substrate; and
a cavity disposed between the first base layer and the piezoelectric element,
wherein the cavity is disposed in a region overlapping the piezoelectric element in a vertical direction.
2 . The mask of claim 1 , wherein the cavity is disposed between the first substrate and the piezoelectric element, and
a width of the cavity in a horizontal direction is 40% or more of a width of the piezoelectric element in the horizontal direction.
3 . The mask of claim 2 , wherein the piezoelectric element overlaps the first wire in the vertical direction.
4 . The mask of claim 2 , wherein the piezoelectric element does not overlap the first wire in the vertical direction.
5 . The mask of claim 2 , comprising
a third substrate disposed between the piezoelectric element and the cavity,
wherein the third substrate includes a silicone-based material and a polymer-based material.
6 . The mask of claim 5 ,
wherein piezoelectric element includes a first electrode disposed facing the cavity, and
wherein the third substrate is in direct contact with the first electrode.
7 . The mask of claim 5 , wherein a width of the cavity in the horizontal direction is 40% to 160% of a width of the piezoelectric element in the horizontal direction.
8 . The mask of claim 7 , comprising
a fourth substrate disposed between the first substrate and the cavity,
wherein the fourth substrate includes a silicone-based material and a polymer-based material.
9 . The mask of claim 1 , wherein the cavity is disposed between the first base layer and the first substrate.
10 . The mask of claim 1 , wherein the cavity is an air gap containing air.
11 . The mask of claim 1 , wherein a thickness of the cavity is 200 μm or less.
12 . The mask of claim 1 , wherein the cavity is disposed in a region where a center of the cavity overlaps a center of the piezoelectric element.
13 . The mask of claim 1 , wherein the first wire and the second wire are formed in a curved shape having a radius of curvature of 3R to 20R (mm).
14 . The mask of claim 1 , wherein the piezoelectric element generates ultrasonic energy of 10 KHz to about 1 MHz.
15 . The mask of claim 1 , wherein a thickness of the first substrate and a thickness of the second substrate are 0.5 μm to 5 μm.
16 . The mask of claim 1 , wherein a thickness of the first wire and a thickness of the second wire are 2 μm to 50 μm.
17 . The mask of claim 1 , comprising
a first metal layer disposed between the piezoelectric element and the second wire.
18 . The mask of claim 1 , comprising
a protective layer disposed between the first and second substrates to surround the piezoelectric element,
wherein the protective layer includes a same material as that of at least one of the first and second base layers.
19 . A skin care apparatus comprising:
a main body in which one side thereof is open and an accommodation space is formed inside an open region; and
a mask according to claim 1 disposed in the open region and connected to the main body.