Structure and method for improving assembly tilt angle of lens and voice coil motor

Abstract

The invention discloses a structure and method for improving the assembly tilt angle of a lens and a voice coil motor. The structure includes: a lens, a bracket of a voice coil motor and a soft lantern ring; a through hole is formed in the center of the bracket; the lens is fixed in the through hole of the bracket through the lantern ring; the outer circumference of the lantern ring is tightly fitted in the through hole of the bracket; and an inner ring of the lantern ring forms a tight fit with the outer circumference of the lens. The soft lantern ring is added at a joint between the bracketand the lens, and the lens and the bracket form a gapless fit through the lantern ring; when UV glue is solidified between the lens and the bracket, the lens and the bracket form an interference fit through the lantern ring, there is no gap in the center, so that the lens will not tilt off, and the lens is located at a central position of the bracket all the time. The assembly accuracy of the lensand the bracket is improved, and the yield of the products can be improved; the problem that the assembly of the lens and the support needs to be broken mechanically during reworking, the lens and the bracket are damaged, and the lens cannot be reused can be solved; and the reworking efficiency is improved.

Description

technical field [0001] The invention relates to a focus lens, in particular to a structure and method for improving the assembly tilt angle of the lens and a voice coil motor. Background technique [0002] Mobile phone cameras widely use Voice Coil Motors (VCM) to achieve auto-focus function, through which the position of the lens can be adjusted to present clear images. The voice coil motor has the characteristics of high frequency response and high precision. Its main principle is to control the stretching position of the spring leaf by changing the DC current of the inner coil of the motor in a permanent magnetic field, so as to drive the lens to move up and down to achieve focusing. [0003] The original lens and voice coil motor are mostly connected by screw teeth. There will be a gap between the screw teeth of the lens and the screw teeth of the voice coil motor bracket. The existence of the gap will easily cause the lens to tilt, causing imaging problems and causing ...

AI Technical Summary

Problems solved by technology

[0003] The original lens and voice coil motor are mostly connected by screw teeth. There will be a gap between the screw teeth of the lens and the screw teeth of the voice coil motor bracket. The existence of the gap will easily cause the lens to tilt, causing imaging problems and causing product failure. The rate of scrapping and defects is increasing. In order to improve this phenomenon, the AA process is often used to assemble the straight lens and the bracket through hole of the voice coil motor. Glue is applied to the inner surface of the bracket to fix the lens on the bracket. The way of screw connection will be improved, but there is also a fit gap between the lens and the voice coil motor bracket. When the UV glue is cured, the glue will shrink. Because there is a gap between the lens and the voice coil motor bracket, the lens The angle will be tilted, resulting in poor assembly, and related products need to be reworked or scrapped. After the lens and voice coil motor are fixed by dispensing glue, go to AA with the sensor holder, and finally perform a module drawing test to confirm whether the module characteristics are correct. OK, if it is NG, the glue bonding the lens and the voice coil motor needs to be destroyed violently. Take out the lens and replace it with a new lens for re-matching. The efficiency is very low, and there is a risk that the voice coil motor and the lens cannot be reused

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