Linear vibrator having terminal connections through first cover

1. A linear vibrator, comprising:

a stator including a circuit substrate formed at a bottom surface with a connection terminal and a coil block arranged at an upper surface opposite to the bottom surface and electrically connected to the connection terminal;

a first cover arranged at the bottom surface of the circuit substrate and formed with an opening for exposing the connection terminal;

a second cover coupled to the first cover in a bottom-opened cylindrical shape; and

a vibrator including a magnet arranged inside the coil block, a yoke in which the magnet is mounted, and an elastic member coupled to the yoke and the second cover to vertically vibrate the magnet relative to the coil block,

wherein the opening of the first cover includes a first opening and a second opening discrete from the first opening, and

wherein the circuit substrate opposite to the first opening is arranged with a first connection terminal electrically connected to the coil block, and the circuit substrate opposite to the second opening is arranged with a second connection terminal electrically connected to the coil block.

2. The linear vibrator of claim 1 , wherein the first and second connection terminals include solder.

3. The linear vibrator of claim 1 , wherein each of the first and second openings takes the shape of any one shape of a circle, a square and a polygon when viewed in a top plan view.

4. The linear vibrator of claim 1 , wherein the first connection terminal exposed by the opening of the first cover takes the shape of a band, and the second connection terminal takes the shape of a plate arranged inside the first connection terminal.

5. The linear vibrator of claim 1 , wherein an upper surface of the connection terminal and a periphery of the first cover are on the same planar surface.

6. The linear vibrator of claim 1 , wherein the connection terminal has a thinner thickness than that of the first cover.

7. The linear vibrator of claim 6 , wherein a height difference between the upper surface of the connection terminal and the periphery of the first cover is 0.1 mm.

8. The linear vibrator of claim 6 , wherein a thickness of the connection terminal is less than 70% of that of the first cover.

9. The linear vibrator of claim 1 , wherein the circuit substrate takes the shape of a rectangle when viewed in a top plan view.

10. The linear vibrator of claim 1 , further comprising a bonding member interposed between the circuit substrate and the first cover to absorb shock and to bond the circuit substrate and the first cover.

11. The linear vibrator of claim 1 , wherein the first cover includes a dummy solder membrane formed on at least a part of the periphery of the first cover to be bonded to a dummy solder pattern of an outside substrate.

12. The linear vibrator of claim 11 , wherein the dummy solder membrane is formed on the first cover in any one shape of a surface shape, a line shape and a spot shape.

13. The linear vibrator of claim 1 , wherein an inner lateral surface of the first cover arranged with the circuit substrate is formed with a circuit substrate accommodation groove for accommodating the circuit substrate to reduce the thickness of the circuit substrate.

14. The linear vibrator of claim 1 , wherein the first and second covers are mutually coupled by welding.

15. The linear vibrator of claim 1 , wherein the magnet includes a first magnet fixed to the yoke and moving inside the coil block, and a second magnet fixed to the yoke to wrap an exterior of the coil block.

16. The linear vibrator of claim 1 , further comprising a weight.

17. The linear vibrator of claim 1 , wherein the elastic member includes a leaf spring connected to the yoke and an inner lateral surface of the second cover.