Linear Array Imager for Long-Range Barcode Reading
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Solution Overview
Problem
Existing imaging readers, particularly those with two-dimensional sensor arrays, are unable to read one-dimensional bar code symbols at extended ranges like moving laser beam readers, which are expensive and difficult to miniaturize for portable devices.
Innovation Solution
A solid-state imager with a linear array of image sensors and an adjustable imaging lens assembly allows for reading one-dimensional symbols at variable working distances, using elongated sensors and a cylindrical optical element to optimize sensitivity and field of view, along with a compact design and intense illumination system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a two-dimensional sensor array is used to read symbols, then color imaging capability is improved, but reading range for one-dimensional symbols is limited
Solution Approach 1:
The sensor array is segmented into multiple independent linear arrays, each optimized for specific reading tasks. The system can activate only the necessary linear array segments based on the symbol type and distance, rather than using the full two-dimensional array, thus improving performance for one-dimensional symbol reading while maintaining color capability when needed.
Solution Approach 2:
The imaging system dynamically adjusts its operational mode between full two-dimensional array operation for color imaging and selective linear array operation for long-range one-dimensional symbol reading. This dynamic reconfiguration allows the system to optimize performance for the current task while conserving resources.
2Measurement precision
If a moving laser beam reader is used to read extended range symbols, then reading range is improved, but manufacturing cost and device size increase
Solution Approach 1:
The patent replaces the mechanical scanning system of laser beam readers with a stationary solid-state linear array imager. The linear array captures the entire symbol image simultaneously without mechanical movement, eliminating the need for complex scanning mechanisms, rotating mirrors, and precise optical alignment systems, thereby significantly reducing manufacturing cost and device complexity while maintaining extended reading range.
Solution Approach 2:
The system creates a complete optical copy of the symbol at the sensor plane, allowing the entire symbol to be captured in a single static image. This eliminates the need for mechanical scanning that copies information sequentially over time, simplifying the system architecture.
3Area of stationary object
If a two-dimensional sensor array is used, then field of view is improved, but sensitivity for long range reading decreases
Solution Approach 1:
The patent applies local quality optimization by using elongated sensor elements in the linear array that are specifically dimensioned to maximize light collection area along the reading axis. Each sensor element has a larger active area in the direction critical for long-range reading sensitivity, rather than using uniform square pixels that distribute area equally in all directions.
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
The solution enables reading of one-dimensional symbols at extended ranges with improved sensitivity, resolution, and cost-effectiveness, while maintaining a compact and portable form factor, overcoming the limitations of two-dimensional sensor arrays and expensive, bulky laser beam readers.
Implementation Method 1
capturing return light scattered and/or reflected from the symbol being imaged
Implementation Method 2
capturing return light scattered and/or reflected from the symbol being imaged
Implementation Method 3
an imaging lens assembly for capturing return light... and for projecting the return light onto the sensor array
Implementation Method 4
a solid-state imager having a linear array of image sensors or pixels arranged in a single row for capturing return light from the symbols
Data Source
AI summary
An imaging module or reader for electro-optically reading both far-out and close-in, one-dimensional symbols located at variable working distances from the module or reader, includes a solid-state imager having a linear array of image sensors arranged in a single row for capturing return light from the symbols, and an imaging lens assembly for adjustably focusing the return light onto the linear array of image sensors to enable the symbols to be read.