Linear vibration motor

Abstract

The invention provides a linear vibration motor. The motor comprises a housing, a vibration unit which is contained in the housing, an elastic component and a driving unit. The vibration unit comprises a mass block with a through hole and a permanent magnet which is mounted in the through hole; the driving unit comprises an iron core which is fixedly installed in the housing and passes through thethrough hole, and a coil which is wrapped around the iron core. The iron core comprises an iron core body portion which passes through the through hole, and two iron core abutting portions which areformed by respectively extending from the two ends of the iron core body portion, away from the iron core body portion, to the central axis direction; the coil is wrapped around the iron core body portion, and the magnetic polarity on the side, close to the coil, of the permanent magnet, is opposite to the magnetic polarity on the side, close to the mass block, of the permanent magnet, and the twoiron core abutting portions can have opposite magnetic polarity after the coil is electrified. According to the linear vibration motor, the vibration unit of the invention is large in driving force,and high in response speed during vibrating compared with the prior art.

Description

【Technical field】 [0001] The invention relates to the field of vibration motors, in particular to a linear vibration motor. 【Background technique】 [0002] A linear vibration motor is a component that uses the principle of electromagnetic force to convert electrical energy into mechanical energy. The linear vibration motor is usually installed in a portable mobile device to generate vibration feedback, such as the vibration of a mobile phone or the vibration feedback of a game console. [0003] In the related art, a linear vibration motor includes a housing with a housing space, a vibration unit accommodated in the housing space, an elastic component suspending the vibration unit in the housing space, and a device for driving the vibration unit to vibrate. A drive unit, the vibration unit includes a permanent magnet, the drive unit includes a coil, and the linear vibration motor usually only provides a driving force through the Lorentz force generated by the interaction betw...

AI Technical Summary

Problems solved by technology

[0003] In the related art, a linear vibration motor includes a housing with a housing space, a vibration unit accommodated in the housing space, an elastic component suspending the vibration unit in the housing space, and a device for driving the vibration unit to vibrate. A drive unit, the vibration unit includes a permanent magnet, the drive unit includes a coil, and the linear vibration motor usually only provides a driving force through the Lorentz force generated by the interaction between the coil and the permanent magnet's magnetic field to drive The vibration assembly vibrates back and forth, but the driving force of the above-mentioned linear vibration motor is small, so the response time of the vibration is long

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