Dual Mode Image Engine for Variable Focal Range
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Solution Overview
Problem
Current image readers face limitations in achieving variable focal distances and extended optical depth of field, particularly in portable applications, due to the impracticality of auto-focusing systems and the inefficiencies of existing techniques such as multiple lenses or Wavefront Coded lens systems, which result in limited depth of field and increased costs or latency.
Innovation Solution
A dual mode image engine that combines a traditional free-space objective lens system with an optically encoded lens system, allowing for selective use of either system based on application requirements, utilizing a common image sensor and processor to optimize focal range and processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an auto-focusing system is implemented to achieve variable focal distances, then the focal range is improved, but the size, cost and power consumption increase significantly
Solution Approach 1:
The patent divides the imaging system into multiple fixed-focus camera modules, each optimized for a specific focal range. Instead of one complex auto-focusing system, multiple simpler modules operate in parallel, with each module handling a particular depth range independently. This segmentation resolves the contradiction by achieving variable focal distances through modular architecture rather than a single complex focusing mechanism.
Solution Approach 2:
The patent creates a multi-functional imaging system where a single device integrates multiple camera modules that can handle different focal ranges. The system universally processes images from various depth zones by selecting appropriate modules, eliminating the need for each module to have auto-focusing capability. This multi-functionality approach resolves the contradiction by distributing the focal range capability across multiple simple modules rather than requiring one complex module.
2Adaptability or versatility
If multiple lenses with different focal lengths are used to image different symbologies, then the adaptability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent segments the imaging function across multiple camera modules, each with a fixed lens optimized for specific symbology types and focal ranges. Rather than using a single complex lens system that must accommodate all symbologies, the system divides the workload among multiple specialized modules, reducing individual lens complexity while maintaining overall system adaptability.
Solution Approach 2:
The patent introduces dynamic selection and switching between multiple fixed-focus camera modules based on the imaging requirements. The system dynamically determines which module to use based on target distance and symbology type, achieving adaptability through intelligent routing rather than through complex mechanical lens adjustment. This dynamic approach resolves the contradiction by maintaining fixed, simple lenses while achieving variable imaging capabilities through system-level control.
3Measurement precision
If Wavefront Coded lens system is used to extend optical depth of field, then the depth of field is improved, but the processing time increases due to the need for image analysis and lens movement
Solution Approach 1:
The patent performs preliminary action by pre-configuring multiple camera modules with fixed focal settings optimized for different depth ranges. Instead of adjusting lenses during operation, the system prepares multiple ready-to-use imaging paths in advance, each optimized for a specific focal range. This preliminary configuration resolves the contradiction by eliminating real-time lens adjustment while maintaining extended depth of field capability through pre-selected optical paths.
Solution Approach 2:
The patent replaces the mechanical lens adjustment system with an electronic selection and switching mechanism. Instead of physically moving lenses to change focus, the system electronically routes light from the appropriate fixed-focus module to the image sensor. This substitution eliminates mechanical latency while maintaining the ability to switch between different focal ranges, resolving the contradiction between extended depth of field and fast response time.
4Device complexity
If a single fixed focal distance lens is used, then the device simplicity is maintained, but the ability to resolve different sized symbologies is limited
Solution Approach 1:
The patent segments the imaging function across multiple fixed-focus camera modules, each optimized for a specific focal range and symbology size. Rather than using one lens that must compromise across all distances, the system divides the imaging task among multiple specialized modules, with each module maintaining simple fixed-focus optics while the collective system achieves broad adaptability.
Solution Approach 2:
The patent uses partial action by activating only the specific camera module needed for the current imaging task. Instead of requiring all modules to be simultaneously functional or adjustable, the system selectively engages the appropriate module based on target characteristics. This approach maintains the simplicity of fixed-focus lenses while achieving versatile symbology resolution through selective deployment of specialized modules.
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 dual mode image engine provides improved depth of field and reduced processing time, enabling efficient decoding of symbologies while maintaining cost-effectiveness and mechanical robustness, suitable for various imaging applications.
Implementation Method 1
direct light reflected from the target onto the image sensor
Implementation Method 2
free-space objective lens system adapted to direct light
Implementation Method 3
an optically encoded lens system adapted to direct light reflected from the target onto the image sensor
Data Source
AI summary
An image reader capable of operating in two modes for imaging a target is described. It includes an image sensor, a free-space objective lens system and an optically encoded lens system each adapted to direct light reflected from the target onto the image sensor, and a processor for processing signals from the image sensor. In one mode, the processor processes signals produced by light from the free-space objective lens system and in the other mode, the processor processes signals produced by light from the optically encoded lens system. To achieve this, the two lens systems may direct light to two different areas on the image sensor, or the lens systems may be selectively controlled to direct light from one or other of the systems onto the image sensor.