Flat oscillating motor

Abstract

The invention discloses a flat type vibrating motor for electronic products which are mobile phones and pagers and the like, wherein the center portion of an upper shell and a lower shell which provide round space in the mutually butted inner portions is perpendicularly fixed with a rotating shaft, the rotating shaft supports a rotor to rotate, the rotor is a flat structure which is integrally formed by two coils and a vibrator with high specific gravity, the two coils are fixed with generation magnetic fields on a printed circuit board which is matched with commutators, the vibrator with high specific gravity is fixed on the upper portion of the coil, the vibrator is tungsten alloy powder with high specific gravity and less quantitative nickel, a circular arc body of the vibrator is subject to a rotating center, more than half of the upper surface of the coil is covered not exceeding the range of 180 degrees, and the lower portion of the rotor is orderly equipped with a permanent magnet and a soft printed winding board, a circular circle of the permanent magnet is equipped with an N pole and an S pole crossways, and the soft printed winding board is connected with an external power supply. One side of an electric brush is fixed on the soft printed circuit board, the other surface contacts with the commutators, the rotor is an integrated structure of resin and metal vibrator with high specific gravity, the resin is used for the upper portion of the coil, a wire casing is formed on the periphery of a bearing, the outer edge of the vibrator is formed into a step shape, the structure of firmly binding with resin injection objects is increased, a hollow core of the coil is also injected by the resin, thereby reducing the coil to deform because of plastic pressure in maximal degree.

Description

Technical field: [0001] The invention relates to electronic devices, in particular to a flat vibrating motor used in electronic products such as mobile phones and pagers. Background technique: [0002] As we all know, mobile communication terminals such as cell phones and pagers use vibrating motors to notify users of incoming calls. At first, the vibrating motors were mainly bar-type motors, but now flat types are widely used. (coin type). [0003] figure 1 with figure 2 Shown is the basic structure of a conventional flat type vibration motor. [0004] figure 1 It is a perspective view illustrating an assembled state of a conventional flat vibration motor, figure 2 It is an exploded oblique view of the vibration motor. [0005] Such as figure 1 , figure 2 As shown, the vibration motor provides an internal space for the press-fit joint of the upper casing (10) and the lower casing (12), and a part of the flexible printed circuit board (16) extends outside the casi...

AI Technical Summary

Problems solved by technology

[0008] Because the vibrator (26) imparts eccentricity to the rotor (20), it should be made of high specific gravity metal. Therefore, the center of the weight of the rotor (20) and the vibrator (26) is concentrated on a specific position. Due to this structural characteristic, If the vibrator (26) is strengthened, the vibrator (26) will be detached from the rotor (20) and the center bearing (28) will also be detached from the body (24) formed by resin injection molding. Limit the volume of the vibrator within the specified size (in order to prevent the vibrator from being given a force greater than the specified size), so it becomes a step limit to limit the increase in the amount of vibration

[0009] In addition, when injecting resin, resin cannot be injected into the space in the center of the coil to form a space. This space will be deformed due to external pressure during injection molding. If the deformed coil is used for a long time, it will cause broken wires. It also becomes a factor that shortens the life of the motor

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