Matrix Testing Target for Parallel Camera Module Inspection
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Solution Overview
Problem
Standard testing targets require each camera module to be tested individually due to the need for each module to see the same image at the same angle, making parallel testing inefficient and time-consuming, especially since the sharpness of lenses varies with distance from the optical center.
Innovation Solution
A matrix testing target is designed with multiple tiles, each containing specific information for testing particular optical properties, allowing adjacent camera modules to face different tiles but see the same information at the same angle, enabling multiple camera modules to be tested in parallel using a single target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single standard testing target is used for each camera module, then each module can be tested individually with accurate sharpness measurement, but testing multiple modules in parallel is not possible and testing time increases
Solution Approach 1:
The testing target is divided into multiple independent tiles, where each tile contains complete testing information (such as ISO-12233 sharpness test patterns). This segmentation allows multiple camera modules to simultaneously view different tiles while receiving equivalent testing content, enabling parallel testing of multiple modules without requiring multiple separate targets.
Solution Approach 2:
A single testing target structure serves multiple camera modules simultaneously by incorporating multiple tiles that can be viewed at different angles. The target becomes a multi-functional device that can test N camera modules in parallel, replacing the traditional one-to-one mapping between target and module, thereby significantly improving testing productivity.
2Loss of time
If multiple standard testing targets are used to test multiple camera modules in parallel, then testing time is reduced, but the cost and space requirements increase
Solution Approach 1:
Multiple testing functions are merged into a single target structure by arranging multiple tiles containing identical or equivalent testing information on one target. This consolidation allows N camera modules to be tested simultaneously using one target instead of requiring N separate targets, reducing both the quantity of targets needed and the associated costs while maintaining parallel testing capability.
Solution Approach 2:
The testing target is designed as a universal structure that can serve multiple camera modules concurrently. By incorporating multiple tiles that provide equivalent testing content, the single target performs the function of multiple targets, enabling time-efficient parallel testing without proportionally increasing the number of physical targets required.
3Productivity
If camera modules are arranged to face the same target, then parallel testing is enabled, but modules at different positions see the target at different angles affecting measurement accuracy
Solution Approach 1:
The target is segmented into multiple tiles, each containing complete testing information. Camera modules positioned at different angles can each view a specific tile frontally, ensuring that despite their different positions, each module receives optimal viewing conditions for accurate sharpness measurement. This segmentation resolves the angle-dependent accuracy issue while maintaining parallel testing capability.
Solution Approach 2:
Different regions (tiles) of the target are designed to serve specific viewing angles and positions. Each tile is optimally positioned and oriented so that camera modules at particular locations can view their assigned tile at the correct angle for accurate measurement. This local optimization ensures measurement precision is maintained across all parallel testing positions.
Data Source
AI summary
An example system for testing camera modules includes: a structure for holding camera modules under test, where each of the camera modules includes an image sensor, and where the camera modules are arranged in a same plane on the structure and offset from each other in the plane; and a target for use in testing the camera modules concurrently, where the target includes multiple tiles that are repeated, where each tile contains information for use in testing a camera module, and where the camera modules and the tiles are arranged so that different camera modules face different tiles but see at least some of the same information at the same angle.