Image Sensor Module Lens Alignment for Pixel Sensitivity Uniformity
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Solution Overview
Problem
Image sensor modules face challenges in maintaining uniform pixel sensitivity due to the limited form factor of mobile devices, leading to image quality deterioration and increased costs due to defective modules.
Innovation Solution
An image sensor module assembly device and method that detect optimal positions for the module optical system and sensor optical system, minimizing sensitivity differences by assembling the module lens at positions that optimize the influence of both systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixels are made finer to increase resolution, then image resolution is improved, but pixel sensitivity uniformity deteriorates
Solution Approach 1:
The patent applies parameter changes by adjusting the position of the module lens relative to the image sensor to optimize optical alignment. By changing positional parameters during assembly, the system achieves both high resolution and uniform pixel sensitivity, resolving the contradiction between fine pixel structure and sensitivity uniformity
Solution Approach 2:
The patent implements preliminary action by performing sensitivity calibration and optimization during the assembly process before final module completion. The assembly device measures and adjusts pixel sensitivity uniformity in advance, preventing sensitivity issues from manifesting in the final product while maintaining fine pixel resolution
2Manufacturing precision
If sensitivity calibration is performed after module assembly, then sensitivity differences can be compensated, but production time and cost increase
Solution Approach 1:
The patent integrates sensitivity calibration into the assembly process itself, performing measurements and adjustments during module fabrication rather than as a separate post-assembly step. This preliminary action eliminates dedicated calibration time from the production schedule while ensuring sensitivity uniformity is achieved
Solution Approach 2:
The patent merges the sensitivity calibration function with the assembly device, combining what were previously separate processes (assembly and calibration) into a single integrated operation. The assembly device simultaneously performs mechanical assembly and optical sensitivity optimization, reducing total production time
3Manufacturing precision
If sensitivity calibration is performed after module assembly, then sensitivity differences can be compensated, but device complexity increases
Solution Approach 1:
The patent implements universality by designing the assembly device to perform multiple functions: mechanical assembly, optical alignment, and sensitivity calibration. This multi-functional device consolidates what would otherwise require separate specialized equipment, managing complexity through functional integration rather than adding separate systems
Solution Approach 2:
The patent merges sensitivity measurement and adjustment capabilities directly into the assembly device, combining functions that could have been separate systems. This integration reduces overall system complexity by eliminating the need for separate calibration equipment and processes
4Ease of manufacture
If module lens position is not optimized, then assembly is simpler, but image quality deteriorates due to sensitivity differences
Solution Approach 1:
The patent applies preliminary action by pre-positioning the module lens at optimized locations during assembly and verifying sensitivity uniformity before completing the assembly process. This ensures optimal image quality is achieved without requiring complex post-assembly adjustments or sacrificing assembly simplicity
Solution Approach 2:
The patent utilizes parameter changes by adjusting the module lens position to specific optimized coordinates that balance assembly simplicity with image quality. By changing positional parameters during assembly, the system achieves both ease of manufacture and high manufacturing precision
Data Source
AI summary
An assembly method of an image sensor module assembly device is provided. The assembly method includes: setting an image sensor and a module lens of an image sensor module at a first position; inputting image data to the image sensor module set at the first position; pre-processing data that are output from the image sensor module based on sensing the input image data; obtaining, based on the pre-processed data, a module optical system reference value of the module lens and a sensor optical system reference value of the image sensor; and determining whether to maintain the first position based on the module optical system reference value and the sensor optical system reference value.