Optical Reader Modular Imaging Module 2D Barcode Decoding
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Solution Overview
Problem
Conventional optical reading devices face limitations in efficiently reading and decoding two-dimensional bar code symbols due to the need for high-resolution scanning along multiple axes and the complexity of integrating illumination and aiming systems within a compact, portable form factor.
Innovation Solution
The development of an optical reading device with a modular imaging module architecture that incorporates surface-mounted LEDs, diffuser optics, and a support assembly with integrated struts and posts, allowing for compact design and efficient illumination and aiming patterns, while enabling flexible integration with various devices such as PDAs and cellular phones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical reading devices use high-resolution scanning along multiple axes to read 2D bar codes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The imaging module is divided into distinct functional components: a light source assembly with multiple LEDs positioned at different locations and angles, an optical system with separate illumination and collection paths, and a sensor array. This segmentation allows each component to be optimized independently for its specific function while contributing to the overall 2D imaging capability, resolving the contradiction between achieving high measurement precision and maintaining system simplicity.
Solution Approach 2:
The patent transitions from conventional 1D linear scanning to 2D matrix code reading by adding a vertical dimension to the light source arrangement. Multiple LEDs are positioned at different vertical heights and angles, creating multiple illumination planes that simultaneously capture horizontal and vertical bar code information. This dimensional expansion enables 2D decoding without requiring complex sequential scanning mechanisms.
2Ease of operation
If the device is made compact and portable, then ease of operation is improved, but the integration of illumination and aiming systems becomes more difficult
Solution Approach 1:
The illumination system and aiming system are merged into a single integrated light source assembly. Multiple LEDs are mounted on a common support structure with precise angular and positional relationships, allowing the same optical component to perform both illumination (for barcode reading) and aiming (for target acquisition) functions. This consolidation reduces the number of separate subsystems that would need to be integrated, thereby simplifying the overall device architecture while maintaining compact dimensions.
Solution Approach 2:
The light source assembly serves multiple functions simultaneously: it provides illumination for barcode decoding, creates aiming patterns for target alignment, and can be adjusted for different reading distances. The same optical components are used across multiple operational modes, eliminating the need for separate dedicated aiming lasers or additional illumination systems, thus reducing integration complexity while enhancing portability.
3Measurement precision
If multiple LEDs are positioned at different locations and angles, then imaging performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The support structure for the light sources is designed and pre-assembled with precisely positioned mounting locations before the LEDs are installed. The structural members include pre-formed features such as recesses, slots, or定位 pins that guide the LEDs into their correct positions and orientations during assembly. This preliminary preparation of the mounting structure eliminates the need for high-precision positioning during the final assembly process, reducing manufacturing precision requirements while maintaining optimal imaging performance.
Solution Approach 2:
The support structure employs different local geometries and features at different locations to accommodate the specific positioning requirements of each LED. Each mounting position is customized with appropriate constraints (such as angled slots for angular adjustment or fixed recesses for precise location) tailored to the optical requirements of that particular LED's function. This localized optimization allows each LED to achieve its required precision without demanding uniform high precision across the entire assembly process.
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 enables high-resolution imaging and efficient data decoding of 2D bar codes with improved compactness and versatility, facilitating integration into diverse devices and enhancing the reading performance across various distances and lighting conditions.
Implementation Method 1
Optical reading devices typically transmit light onto a symbol and receive light reflected off of the symbol
Implementation Method 2
incorporates surface-mounted LEDs
Data Source
AI summary
A data reader system comprising an optical reader for reading symbol indicia and producing a symbol signal representative of the symbol indicia; a memory device for storing parameter data specific to the optical reader; and a processor for controlling: the optical reader; receiving the symbol signal and interpreting the symbol signal; the processor having memory for storing parameter data specific to the optical reader, wherein the processor is located remotely from the optical reader and memory device.