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1. US20200212781 - Linear Vibration Motor

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[ EN ]

Claims

1. A linear vibration motor comprising:
a base with a containing space;
a vibration unit, disposed in the containing space and vibrating along a vibration direction, including a weight, a containing groove penetrating through the weight along the vibration direction, two magnets spaced oppositely in the containing groove and fixed to the weight respectively;
an elastic piece, for suspending the vibration unit in the containing space, located on and fixed to one side of the vibration unit along the vibration direction of the vibration unit;
a coil assembly fixed to the base for driving the vibration unit to vibrate;
wherein
an orthographic projection of the coil assembly along the vibration direction is located between the two magnets and is spaced from the two magnets;
the coil assembly comprises an iron core fixed to the base and a coil wound around the iron core; and
two magnets are magnetized along the vibration direction, and the magnetic poles of the two magnets are contrary arranged; a magnetizing direction of the coil assembly is perpendicular to the vibration direction and is parallel to a connecting line of the two magnets.
2. The linear vibration motor as described in claim 1, wherein the coil assembly extends partially between two magnets.
3. The linear vibration motor as described in claim 1, wherein the coil assembly comprises two pieces which are both fixed on the base and are respectively positioned on two opposite sides of the vibration unit along the vibration direction.
4. The linear vibration motor as described in claim 1, wherein the weight further comprises two fixing grooves recessed outwards from two opposite sides of the containing groove; the two magnets are respectively fixed in the two fixing grooves.
5. The linear vibration motor as describe in claim 4, wherein a depth of the fixing groove is equal to a thickness of the magnet.
6. The linear vibration motor as describe in claim 1, wherein the elastic piece comprises a ring-shaped first fixing arm, a ring-shaped second fixing arm and a spring arm connecting the first fixing arm to the second fixing arm; the first fixing arm is arranged around the periphery of the accommodating groove and is fixedly connected with the weight; the second fixing arm is connected to the base for suspending the spring arm.
7. The linear vibration motor as describe in claim 6, wherein the elastic piece further comprises a reinforcing arm bent and extended from the periphery of the second fixing arm, and the reinforcing arm is fixedly connected with the base
8. The linear vibration motor as describe in claim 6, wherein the weight protrudes from one side of the elastic piece for forming a fixing platform, the fixing platform extends along the periphery of the containing groove, and the first fixing arm is sleeved on and fixed to the fixing platform.