Camera Module Focus Alignment Using Sensor Position Feedback
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Solution Overview
Problem
Current focus adjustment methods for camera modules are time-consuming and prone to variations in accuracy, requiring significant effort and time, especially when adjusting the position and angle of image sensors relative to the optical system.
Innovation Solution
A focus adjustment method that includes measuring the installation position and angle of the image sensor, adjusting the camera substrate's position and angle based on these measurements, and continuously imaging chart images to identify and achieve an in-focus state without stopping the camera substrate, thereby reducing the time required for focus adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If focus adjustment is performed manually or using conventional automatic methods, then the image sensor can be positioned relative to the optical system, but the adjustment time becomes excessively long and accuracy varies significantly
Solution Approach 1:
The patent measures the installation position and angle of the image sensor on the camera substrate before assembly, and pre-calculates the required adjustment amounts. This preliminary measurement and calculation phase enables the focus adjustment to be performed quickly and accurately after assembly without time-consuming trial and error
Solution Approach 2:
The patent implements a feedback mechanism where the measured installation position and angle of the image sensor are used to determine the precise adjustment amounts needed for the camera substrate. This closed-loop approach ensures accurate focus adjustment by continuously comparing the actual position with the target position and making corrective adjustments
2Measurement precision
If the camera substrate is stopped to acquire imaging data during focus adjustment, then measurement accuracy can be ensured, but productivity decreases due to repeated stopping and waiting for vibrations to subside
Solution Approach 1:
The patent transitions from a static measurement approach (stopping the camera substrate) to a dynamic measurement approach where imaging data is acquired during continuous movement. The system captures multiple imaging data points while the camera substrate moves, and processes this dynamic data to determine the in-focus state without requiring the substrate to be stationary
Solution Approach 2:
The patent enables continuous acquisition of imaging data during the focus adjustment process without interrupting the movement of the camera substrate. This continuous data acquisition maintains productivity by eliminating stopping and waiting time, while still providing sufficient data for accurate focus determination through processing multiple data points
Data Source
AI summary
A focus adjustment method for a camera module equipped with an optical system, an image sensor, and a camera substrate to which said image sensor is mounted. The focus adjustment method includes a measurement step of measuring an installation position and an installation angle of the image sensor on the camera substrate, an adjustment step of adjusting a position and an angle of the camera substrate relative to the optical system, and an assembly step of assembling the camera substrate to the optical system after adjusting the position and angle of the camera substrate. The adjustment step includes adjusting the position and angle of the camera substrate based on the installation position and angle of the image sensor as measured so that a position and an angle of the image sensor relative to the optical system become a set position and a set angle predefined according to the optical system.