Linear vibrator

Abstract

The invention discloses a linear vibrator. An upper-end fixation part includes an upper case and a first permanent magnet fixed with the upper case. A lower fixation part consists of a lower case, a flexible circuit board, and a second permanent magnet fixed to the lower case. A vibration part includes an elastic part, a hollow coil, a metal plate and a mass body; the elastic part enables the vibration part and the upper case to be connected mutually; the upper case and the lower case form a housing of the linear vibrator to provide internal space. The first permanent magnet and the second permanent magnet are opposed to the upper and lower end surface of the hollow coil respectively and the magnetic properties of the first permanent magnet and the second permanent magnet are identical with the magnetic property of a magnetic pole opposite to the hollow coil. The mass body is arranged at the periphery of the hollow coil; a metal body is arranged in the hollow coil; an external power supply is inputted into the coil by a flexible circuit board; and when the coil is electrified, the metal body becomes an electromagnet. According to the linear vibrator, the metal body inserted into the hollow coil serves as the electromagnet and interacts with the permanent magnets, so that the vibration part moves up and down rapidly to make vibration.

Description

technical field [0001] The invention relates to a linear vibrator, in particular to a linear vibrator applied to a hand-held communication device. Background technique [0002] Recently, there has been a surge in shipments of large-screen LCD mobile phones that are convenient for consumers to use, and most of the large-screen LCD mobile phones adopt the touch screen mode. Vibration motors are used to generate vibrations when touch screens are used. The vibration motor uses the principle of electromagnetic force to convert electromagnetic energy into mechanical energy, and is installed in the mobile phone to transmit signals in a silent manner. [0003] In the prior art, the rotating part of the unbalanced mass is rotated by generating rotational force to obtain mechanical vibration, such as the contact between the brush (Brush) and the commutator (Commutator) to produce a rectification effect, thereby obtaining the rotational force in the form of mechanical vibration . Br...

AI Technical Summary

Problems solved by technology

Brush series motors using commutators, due to the mechanical friction generated by the brushes when they pass through the commutator segments during rotation, sparks and foreign objects will be generated, which will shorten the service life of the motor

Moreover, it takes a certain amount of time to reach the target vibration amount due to the inertia of the rotation after the motor is turned on, so it is difficult to generate screen touch vibration

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