Back-Illuminated Image Sensor for High-Density 2D Barcode Reading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Indicia reading devices face challenges in efficiently reading and decoding two-dimensional matrix symbologies due to the need for higher resolution and multiple linear scans, which can be cumbersome and less efficient compared to one-dimensional codes, and there is a need for improved image capture and processing capabilities in portable and wireless devices.
Innovation Solution
The use of a back-illuminated image sensor with a light converting portion on the back face of the chip, combined with advanced optics and processing algorithms, allows for efficient digitization and decoding of both one-dimensional and two-dimensional barcodes, enabling improved data capture and processing in portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple linear scans are used to read 2D matrix codes, then data density increases, but scanning complexity and time increase
Solution Approach 1:
The patent replaces mechanical scanning systems with a back-illuminated image sensor that captures the entire 2D matrix code in a single snapshot. This allows the device to read high-density 2D barcodes without requiring multiple linear scans, thereby increasing data density while reducing scanning complexity and time.
2Measurement precision
If back-illuminated image sensor is used, then image capture quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent employs a back-illuminated image sensor where light enters through the back surface of the substrate rather than the front. This inversion of the traditional sensor architecture allows light to reach the photodetectors without being blocked by circuitry, significantly improving image capture quality and low-light performance while using standard CMOS fabrication processes.
3Measurement precision
If higher resolution imaging is used to read 2D codes, then decoding accuracy improves, but device power consumption increases
Solution Approach 1:
The patent utilizes back-illuminated CMOS technology with adjustable gain settings and adaptive exposure control. The image sensor can dynamically adjust its sensitivity and integration time based on lighting conditions, allowing high-resolution imaging of 2D codes with optimized power consumption by only using the necessary resolution and exposure levels for accurate decoding.
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
This solution enhances the ability to read and decode 2D matrix codes with greater data density, improving the efficiency and versatility of portable indicia reading devices by providing high-resolution image capture and processing, facilitating seamless communication with remote systems.
Implementation Method 1
back-illuminated image sensor which digitizes a representative image seen in an imaging field of view
Data Source
AI summary
An optical reading device for collecting and processing symbology data comprising: a back-illuminated image sensor for converting light reflected from an information bearing indicia (IBI) into output signals representative thereof; receive optics for directing light from the target to the back-illuminated image sensor; a processor for decoding the output signals; an illumination source for generating illumination light illuminating the target and illumination optics for directing the illumination light onto the target and a housing encompassing the back-illuminated image sensor, receive optics and illumination source adapted for hand held operation.