There is provided a vibrator including: an elastic member of which both end portions are fixedly attached to a housing; a piezoelectric element installed on one surface of the elastic member; and a circuit board attached to the elastic member to be connected to the piezoelectric element, wherein an opening portion for a connection between the piezoelectric element and the circuit board is provided in the elastic member, and a step portion insertedly disposed in the opening portion is formed at the circuit board.
1. A vibrator comprising:
an elastic member of which both end portions are fixedly attached to a housing;
a piezoelectric element installed on one surface of the elastic member; and
a circuit board installed on another surface of the elastic member, which is opposite to the one surface of the elastic member,
wherein the elastic member includes an opening portion through which the piezoelectric element and the circuit board are connected to each other, and
wherein the circuit board includes a step portion which is formed to be inserted to the opening portion of the elastic member.
2. The vibrator of claim 1 , wherein the circuit board further includes a connection electrode which is formed on the step portion to make an electric connection with the piezoelectric element.
3. The vibrator of claim 1 , wherein the piezoelectric element includes at least one pair of external electrodes.
4. The vibrator of claim 1 , wherein the opening portion has a rectangular shape when viewed from above, and the step portion has a shape corresponding to the opening portion so that the step portion can be inserted to the opening portion.
5. The vibrator of claim 1 , further comprising a mass body part disposed on the piezoelectric element to increase a degree of vibrations of the elastic member.
6. The vibrator of claim 5 , wherein the mass body part includes a mass body case connected to the piezoelectric element via an adhesive member, and a mass body installed in the mass body case.
7. The vibrator of claim 2 , wherein the connection electrode includes:
a first connection electrode connected to a first external electrode formed at one end portion of a bottom surface of the piezoelectric element; and
a second connection electrode connected to a second external electrode formed at the other end portion of the bottom surface of the piezoelectric element.
8. The vibrator of claim 1 , wherein the circuit board is formed of a flexible printed circuit board (FPCB).
9. The vibrator of claim 1 , wherein the housing includes:
an upper case having an internal space and an open lower end portion; and
a lower case attached to the upper case and having a support part supporting both end portions of the elastic member.
10. A vibrator comprising:
an upper case having an internal space and an open lower end portion;
a lower case attached to the upper case and including a support part provided at both end portions thereof;
an elastic member of which both end portions are supported by the support part and which includes an opening portion;
a piezoelectric element installed on one surface of the elastic member; and
a circuit board installed on another surface of the elastic member and including a step portion which is formed to be inserted to the opening portion of the elastic member,
wherein the circuit board is formed of a flexible printed circuit board.