Sound generating device and preparation method of metal plastic part

Abstract

The invention provides a sound generating device and a preparation method of a metal plastic part. The sound generating device comprises the metal plastic part; the metal plastic part comprises a plastic part body and a metal insert combined with the plastic part body; the surface of the metal insert is provided with an oxidation film layer obtained through metal nanometer treatment and nano-holes located on the surface of the oxidation film layer, and the hole diameter of the nano-holes ranges from 20 nm to 1,000 nm; the nano-holes are filled with a resin composition for preparing the plastic part body. According to the sound generating device and the preparation method of the metal plastic part, the nano-holes are filled with the resin composition from which the plastic part body is prepared, therefore, the purpose that the metal insert and the plastic part body are closely attached to each other is achieved, the adhesive grasping capability of the metal inset is greatly enhanced, and the condition that the metal insert and the plastic part body are separated from each other after being subjected to injection molding is prevented; the length that the metal insert is embedded into the plastic part body is greatly decreased, therefore, ultrasonic energy is smoothly transmitted, the ultrasonic non-melting problem of the metal plastic part is effectively prevented, then the waterproofness and the sealing property of the metal plastic part are improved, and the properties of the sound generating device are improved.

Description

technical field [0001] The invention relates to the field of acoustic products, more specifically, to a sound generating device and a method for preparing metal and plastic parts. Background technique [0002] With the advancement of science and technology, mobile phones, computers, TVs and other electronic products have higher and higher requirements for waterproof and sealing performance. How to improve the waterproof and sealing performance of electronic products has become a very important part of electronic product design. [0003] Taking the loudspeaker, which is commonly used in electronic products, as an example, the common loudspeakers at present mainly include dynamic loudspeakers, electromagnetic loudspeakers, capacitive loudspeakers, piezoelectric loudspeakers, etc. The dynamic loudspeakers are relatively simple to manufacture, Low cost, good low-frequency sound advantages and so on. The existing dynamic speaker is also called a dynamic speaker module, which usu...

AI Technical Summary

Problems solved by technology

Due to the large material difference between the metal insert and the plastic part, the bonding force is low, and the plastic part shrinks after the two injection molds are cooled, and the contact part of the plastic part and the metal insert is easily separated from the metal insert, so that the metal insert Form gaps with plastic parts, these gaps will deteriorate the waterproof performance and sealing performance of the speaker module

[0005] Moreover, in order to improve the bonding force between the metal insert and the plastic part and avoid forming a gap between the metal insert and the plastic part, the length of the metal insert inserted into the plastic part is usually increased, while the upper part of the speaker module shell When the shell and the lower shell are combined by ultrasonic sealing (also known as ultrasonic welding), the length of the larger metal insert embedded in the plastic part will affect the transmission of ultrasonic energy, resulting in ultrasonic infusibility near the metal insert, resulting in a loudspeaker module The waterproof performance and sealing performance are greatly reduced

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