Controller Actuation Timing for Contact Image Sensor Alignment
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Solution Overview
Problem
Misalignment of contact image sensor dies in imaging devices leads to skewed or broken images, especially in higher resolution image generation, requiring complex alignment procedures to correct.
Innovation Solution
An imaging system with a controller that determines the actuation order and timing of optical sensors based on their alignment, using a calibration scan to compensate for misalignment and ensure accurate image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple contact image sensor dies are used to create the array of optical sensors to accommodate various object sizes, then the imaging system can capture images of different object sizes, but misalignment of the dies and sensors occurs resulting in broken images
Solution Approach 1:
The system performs a calibration scan before actual imaging to determine the precise alignment of multiple sensor dies. This preliminary measurement allows the controller to calculate and apply compensation values that correct for misalignment between dies, ensuring accurate image reconstruction without requiring perfect mechanical alignment during manufacturing
Solution Approach 2:
The system dynamically adjusts the actuation timing and order of optical sensors based on measured alignment parameters. By changing the temporal parameters of sensor actuation rather than relying solely on fixed spatial alignment, the system compensates for manufacturing variations in die positioning and sensor placement
2Measurement precision
If contact image sensors are used to generate high resolution images, then image quality is improved, but misalignment of the die with the imaging area results in skewed images requiring modification
Solution Approach 1:
The system uses a calibration scan to measure the actual alignment between the sensor die and the imaging area, then feeds this information back to the controller. The controller uses this feedback to calculate compensation values that adjust the actuation sequence of sensors, thereby correcting skew in the captured image without requiring perfect initial alignment
Solution Approach 2:
A calibration scan is performed before actual high-resolution imaging to pre-determine the alignment characteristics of the die. This preliminary measurement enables the system to prepare compensation parameters in advance, ensuring that high-resolution images are captured without skew even when die alignment is imperfect
3Manufacturing precision
If alignment procedures are implemented to correct misalignment, then image accuracy is improved, but device complexity and processing time increase
Solution Approach 1:
The system performs self-calibration by automatically measuring its own sensor die alignment through a calibration scan and then automatically calculating and applying compensation values. This self-service approach eliminates the need for complex manual alignment procedures or additional alignment hardware, reducing device complexity while maintaining high image accuracy
Data Source
AI summary
Imaging systems and methods for actuating image sensors based on alignment are disclosed. An example method includes determining by a controller an alignment of a plurality of sensors, the sensors adapted to capture an image of an object. The method also includes actuating the sensors with the controller based on the alignment.