Camera Module Focusing Adjustment for Adhesive Shrinkage
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Solution Overview
Problem
The existing methods for focusing adjustment in camera modules, which rely on manual or automatic adjustment of the image sensor's position and angle relative to the lens system, often result in misalignment due to thermal curing of thermosetting adhesives, leading to reduced focusing accuracy.
Innovation Solution
A focusing adjustment method that predicts and offsets the shrinkage deviation of the camera board and lens module during thermal curing by adjusting their positions and angles before securing them, ensuring precise alignment and higher focusing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermosetting adhesive is used to secure the camera board to the optical system, then the connection strength is improved, but the focusing accuracy deteriorates due to shrinkage during thermal curing
Solution Approach 1:
The patent applies preliminary action by adjusting the position and angle of the camera board relative to the optical system before the adhesive is thermally cured. The adjustment is performed in advance to account for the shrinkage that will occur during curing, ensuring that when the adhesive cures and secures the components, the focusing accuracy is maintained. This resolves the contradiction by performing the alignment adjustment before the harmful shrinkage effect is fully realized.
Solution Approach 2:
The patent applies preliminary anti-action by predicting the shrinkage deviation amount that will occur during adhesive curing and intentionally offsetting the camera board position by this predicted amount before curing. This counteracts the harmful shrinkage effect in advance, preventing misalignment. The anti-action directly addresses the contradiction by preparing for and compensating against the shrinkage that would otherwise reduce focusing accuracy.
2Productivity
If automatic adjustment is used to reduce adjustment time, then the productivity is improved, but the focusing accuracy deteriorates due to variations in focusing accuracy
Solution Approach 1:
The patent applies feedback by measuring the actual attitude of the image sensor with respect to the optical system and using this measurement to determine the necessary adjustment. The feedback loop ensures that the adjustment is based on actual measured values rather than predetermined assumptions, allowing automatic adjustment to achieve both high productivity and high focusing accuracy by continuously monitoring and correcting based on real measurements.
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 method enhances focusing accuracy by anticipating and compensating for adhesive shrinkage, maintaining precise alignment between the camera board and lens module, thus improving the assembly of camera modules.
Implementation Method 1
components constituting the camera module may be heat-shrink or the adhesive may shrink due to its thermal curing
Data Source
AI summary
A focusing adjustment method of a camera module predicts, before completion of securing of a camera board to an optical system, a shrinkage deviation amount by which the optical system and the camera board will approach one another. The focusing adjustment method adjusts a position and an angle of the camera board to separate, by the predicted shrinkage deviation amount, the camera board from the optical system as compared with a focusing attitude of the image sensor with respect to the optical system where the optical system is in focus on the image sensor to accordingly offset the predicted shrinkage deviation amount.