Progressive Magnification Imaging Lens Assembly for Barcode Scanning
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Solution Overview
Problem
Barcode and optical readers face challenges in capturing sharp images at a distance due to their compact nature, which limits their ability to accommodate powerful magnification systems, and existing complex electromechanical solutions are costly and affect device reliability.
Innovation Solution
A modular imaging system with a moveable lens assembly and a base lens assembly that allows simultaneous magnification of different parts of the image, using a combination of aspherical and spherical lenses to achieve progressive magnification and correct barrel distortion, enabling high-resolution image capture over a long range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a compact device structure is used, then the device portability is improved, but the ability to accommodate powerful magnification systems deteriorates
Solution Approach 1:
The imaging system is divided into multiple lens assemblies (first lens assembly, second lens assembly, third lens assembly) with distinct functions. The first lens assembly provides initial imaging, the second provides magnification, and the third provides additional magnification. This segmentation allows each component to be optimized for its specific function while keeping the overall device compact.
Solution Approach 2:
The patent employs a nested arrangement where lens assemblies are positioned sequentially along the optical path within a compact housing. The multiple lens assemblies are integrated in a space-efficient manner, with each assembly nested within the overall device structure, maximizing the use of available space while maintaining optical performance.
2Measurement precision
If complex electromechanical components are added to achieve magnification, then the image capture capability at long distance is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces complex electromechanical zoom mechanisms with a purely optical solution using multiple lens assemblies with different focal lengths. The magnification is achieved through optical design rather than mechanical movement of components, eliminating the need for motors, gears, and control systems associated with electromechanical zoom.
Solution Approach 2:
The system achieves variable magnification by changing the optical parameters of the lens assemblies. Each lens assembly has a specific focal length that determines its magnification contribution. By selecting appropriate focal lengths for each assembly and positioning them at specific distances from the sensor, the system achieves progressive magnification without mechanical adjustment.
3Device complexity
If conventional lens systems are used, then the device simplicity is maintained, but the image resolution at varying distances deteriorates
Solution Approach 1:
Different regions of the optical system are assigned different functional qualities. The first lens assembly is optimized for wide-field imaging at shorter distances, while the second and third lens assemblies are optimized for magnified imaging at longer distances. This local optimization of optical properties across different parts of the system enables high resolution across a wide range of distances.
Solution Approach 2:
The system provides dynamic adaptability through its multi-lens design, allowing it to effectively capture images at varying distances without mechanical adjustment. The optical design inherently provides different magnification levels for different object distances, enabling the system to adapt to changing imaging requirements while maintaining simplicity.
4Device complexity
If a single magnification level is used, then the device simplicity is maintained, but the versatility for different scanning distances deteriorates
Solution Approach 1:
The imaging system is designed to perform multiple functions using a fixed optical configuration. The combination of three lens assemblies with different focal lengths enables the system to capture images at multiple distance ranges and magnification levels without requiring mechanical adjustment or switching mechanisms. This universal design achieves versatility through optical design rather than mechanical complexity.
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 system effectively captures barcodes at varying distances with improved resolution and field of view, reducing image degradation and enhancing device efficiency by using lightweight materials and electromechanical control for quick focus adjustment.
Implementation Method 1
light received within the FOV passes through the moveable lens assembly and the base lens assembly and impinges onto the image sensor
Implementation Method 2
At least one of the moveable lens assembly and the base lens assembly is operable to simultaneously magnify at a first magnification value and magnify at a second magnification value
Data Source
AI summary
A method and apparatus for capturing an image of at least one object appearing in a field of view (FOV). A housing has an image sensor and a base lens assembly fixedly mounted relative thereto. A moveable lens assembly is movably mounted relative to the housing. The moveable lens, the base lens assembly, and the image sensor are aligned such that light received within the FOV passes through the moveable lens and the base lens assembly and impinges onto the image sensor. The light received from the FOV forms an original image prior to entering the movable lens and the base assembly. Light from the FOV impinging onto the sensor forms an impinging image.