LINEAR VIBRATOR
Disclosed is a linear vibrator, the linear vibrator including: a case including a lower case and an upper case coupled to the lower case to form a space; a stator including a circuit substrate arranged on the lower case and a coil block electrically connected to the circuit substrate; a vibrator including a magnet facing the coil block and a weight secured to the magnet; and a back yoke including a back yoke unit securing the vibrator and a pair of symmetrically formed spring units integrally formed with the back yoke unit.
1 . A linear vibrator, comprising: a case including a lower case and an upper case coupled to the lower case to form a space; a stator including a circuit substrate arranged on the lower case and a coil block electrically connected to the circuit substrate; a vibrator including a magnet facing the coil block and a weight secured to the magnet; and a back yoke including a back yoke unit securing the vibrator and a pair of symmetrically formed spring units integrally formed with the back yoke unit.
2 . The linear vibrator of claim 1 , wherein the spring unit is vertically formed relative to the back yoke unit and formed in parallel with a lateral surface of the lower case.
3 . The linear vibrator of claim 1 , wherein an edge of the back yoke unit is formed with a lug inhibiting the spring unit from being contacted to the back yoke unit.
4 . The linear vibrator of claim 3 , wherein the spring unit opposite to the lug is formed with a clip unit securing the vibrator.
5 . The linear vibrator of claim 1 , wherein each pair of the spring units has a different width for adjusting elastic modulus of the spring units
6 . The linear vibrator of claim 1 , wherein the width of the spring unit tapers off from both distal ends of the spring unit to a center of the spring unit.
7 . The linear vibrator of claim 1 , wherein the spring unit includes a first spring unit integrally connected to the back yoke unit, a second spring unit secured to the case and a bent unit connected to the first and second spring units.
8 . The linear vibrator of claim 7 , wherein the first and second spring units are formed at an acute angle.
9 . The linear vibrator of claim 7 , wherein the second spring unit is formed with a coupling unit bent in parallel with a floor plate of the lower case to be coupled to the lower case.
10 . The linear vibrator of claim 9 , wherein the coupling unit is formed with a jig hole inserted by a jig pin to allow the coupling unit to be arranged at a designated position of the lower case.
11 . The linear vibrator of claim 7 , wherein each of the first spring unit and the second spring unit has the same length.
12 . The linear vibrator of claim 1 , wherein an edge of the back yoke unit is formed with a damping magnet mounting unit mounted with a damping magnet for inhibiting collision with the case.
13 . The linear vibrator of claim 1 , wherein the damping magnet is arranged with a magnetic liquid for absorbing shock.
14 . The linear vibrator of claim 1 , wherein a pair of damping magnet mounting units is formed with at a corner of a diagonal direction based on a center of the back yoke unit.
15 . The linear vibrator of claim 1 , wherein the circuit substrate of the stator is formed with a coil block damage prevention unit for inhibiting damage of the coil block by the vibrator when the vibrator is protruded to outside of the coil block and dropped.
16 . The linear vibrator of claim 15 , wherein the coil block damage prevention unit is extended from both edges facing the circuit substrate.
17 . The linear vibrator of claim 1 , wherein the spring unit is symmetrically formed to both edges facing the back yoke unit based on the center of the back yoke unit.
18 . The linear vibrator of claim 1 , wherein the weight includes an opening that fixes the magnet.
19 . The linear vibrator of claim 1 , wherein the back yoke unit encompasses the weight and the magnet to inhibit a magnetic flux generated by the magnet from being leaked.
20 . The linear vibrator of claim 1 , wherein the coil block is formed therein with a slip type oblong opening.