Camera Module Lens Holder Bonding for Tilt Prevention
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Solution Overview
Problem
Conventional camera modules face issues with vertical tilting of the lens unit due to improper epoxy coating, leading to reduced adhesive strength and performance degradation from heat and gas generated during curing, which affects image resolution and causes ghost phenomena.
Innovation Solution
Bonding the lens unit to the lateral surface of a holder with two bodies, where the lens unit is fixed to the inner surface of one body and the other body is mounted on top, with exhaust grooves on the contacted surfaces to discharge heat and gas, enhancing adhesive power and preventing vertical tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxy is coated to bond the lens unit to the PCB, then the lens unit is fixed in position, but vertical tilting occurs due to improper coating leading to reduced adhesive strength
Solution Approach 1:
The holder is divided into two separate bodies: a first body that bonds to the lens unit and a second body that mounts to the first body. This segmentation allows the bonding surface to be separated from the mounting surface, enabling better control of adhesive coating and preventing vertical tilting while maintaining strong bonding.
Solution Approach 2:
The lens unit is bonded to the lateral surface of the holder rather than the top surface. This dimensional change in bonding orientation provides a larger effective bonding area and allows for more uniform epoxy distribution, eliminating vertical tilt issues while maintaining strong adhesion.
2Reliability
If epoxy is coated for bonding, then the lens unit is fixed, but heat and gas generated during curing reduce adhesive power and cause ghost phenomena
Solution Approach 1:
Exhaust grooves are created to extract and vent the heat and gas generated during epoxy curing. These grooves provide escape paths for harmful byproducts, preventing them from compromising adhesive performance and causing ghost phenomena, while allowing the bonding process to proceed effectively.
Solution Approach 2:
The exhaust grooves convert the harmful heat and gas byproducts of curing into a beneficial venting mechanism. By providing controlled escape paths, the design transforms potential defects into a feature that actually improves bonding reliability by preventing pressure buildup and adhesive degradation.
3Device complexity
If the lens unit is bonded to the PCB, then the structure is simple, but the bonded surface is narrow reducing adhesive strength
Solution Approach 1:
The bonding interface is moved from the top surface (PCB plane) to the lateral surface of the holder. This dimensional repositioning provides a significantly larger bonding area for the epoxy adhesive, dramatically increasing adhesive strength while the two-body holder structure adds minimal complexity to the overall assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents vertical tilting, increases adhesive strength, and reduces the occurrence of ghost phenomena and resolution degradation by allowing for better heat and gas discharge during epoxy curing.
Implementation Method 1
exhaust grooves for discharging gas and heat generated in the course of curing adhesive
Implementation Method 2
exhaust grooves for discharging gas and heat generated in the course of curing adhesive
Implementation Method 3
adhesive for the light to be irradiated to the image sensor (2) through the plurality of lenses
Data Source
AI summary
The present invention relates to a camera module including: a lens unit mounted with at least one or more lenses; an image sensor mounted with an image pickup device for converting a light converged through the lenses to an electric signal; a PCB (Printed Circuit Board) mounted with the image sensor; and a holder accommodated inside the lens unit for supporting the lens unit, wherein the lens unit is bonded and fixed at an inner surface of the holder, whereby the lens unit mounted with a plurality of lenses is bonded to a lateral surface of a holder to prevent generation of vertical tilting phenomenon at the lens unit caused by a conventional improper coating of epoxy, and particularly, the coating of epoxy on the lateral surface of the holder advantageously enhances adhesive power to increase a bonded area.