Tilted Measurement Chart for Camera Module Alignment
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Solution Overview
Problem
Conventional camera module manufacturing apparatuses are time-consuming in adjusting the position of the sensor board relative to the lens unit due to the need for capturing images at multiple positions, which hampers productivity.
Innovation Solution
A camera module manufacturing apparatus that utilizes a collimator lens and a tilted measurement chart to form images on the image sensor, allowing for quick adjustment of the relative position of the lens unit and sensor board by obtaining spatial frequency response or focus assessment values in a single image capture, with a telecentric optical system configuration for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple image captures at different positions are performed to adjust the sensor board position, then the position adjustment accuracy is improved, but the adjustment time increases
Solution Approach 1:
The measurement chart is tilted relative to the optical axis, introducing a spatial dimension that allows multiple measurement positions to be captured simultaneously in a single image. This transforms a time-consuming sequential measurement process into a parallel spatial measurement, resolving the contradiction between measurement precision and adjustment time.
Solution Approach 2:
The system dynamically adjusts the tilt angle of the measurement chart to optimize the distribution of image formation plane heights. By making the measurement chart tiltable rather than fixed, the system can adaptively configure the spatial frequency response measurement geometry to achieve both high precision and efficiency.
2Productivity
If a tilted measurement chart is used to obtain multiple focus assessment values simultaneously, then the productivity is improved, but the optical system complexity increases
Solution Approach 1:
The tilted measurement chart serves multiple functions simultaneously: it acts as both the measurement target and the spatial encoder. By tilting the chart, it encodes multiple measurement positions in a single image, enabling the optical system to perform multiple focus assessments without requiring additional optical components or complex mechanisms.
Solution Approach 2:
The tilted measurement chart acts as an intermediary that translates spatial position information into optical path variations. Instead of requiring complex mechanical positioning systems to move the sensor board through multiple positions, the tilted chart mediates the measurement process by encoding position information in its tilt geometry, simplifying the overall system.
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
Enables rapid and accurate adjustment of the lens unit and sensor board position, significantly increasing productivity by obtaining multiple focus assessment values simultaneously and reducing error factors.
Implementation Method 1
an optical unit including a collimator lens and a measurement chart for forming an image of the measurement chart on the image sensor through the collimator lens and the taking lens
Implementation Method 2
a sensor board to which an image sensor configured to convert an image that is formed by the taking lens into an image signal is attached
Data Source
AI summary
There is disclosed a camera module manufacturing apparatus for joining together a lens unit that incorporates a taking lens and a sensor board to which an image sensor is attached. The camera module manufacturing apparatus includes an optical unit including a collimator lens and a measurement chart for forming an image of the measurement chart on the image sensor through the taking lens. The relative position of the lens unit and the sensor board is adjusted based on an image signal obtained by converting, using the image sensor, an image of the measurement chart that is formed on the image sensor by the optical unit. The measurement chart is disposed to be tilted with respect to a plane that is perpendicular to an optical axis of the collimator lens.