Modular Focus System for Image Code Readers
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Solution Overview
Problem
Existing image-based code readers face limitations in flexibility and durability, as fixed focus readers are unsuitable for varying target distances, manual focus readers are cumbersome and expose internal components to environmental conditions, and variable focus readers are expensive and prone to breakage due to their electromechanical components.
Innovation Solution
A modular focus system for image-based code readers that includes removable lens attachments, such as a manual focus lens cap with a focus ring and a variable focus lens module with a liquid lens electrically controlled by electrodes, allowing for easy switching between focus modes without moving parts and exposure to the environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed focus lens is used in a code reader, then the device structure is simple and cost-effective, but the reader cannot adapt to varying target distances
Solution Approach 1:
The lens system is divided into a fixed focus lens and removable lens attachments. The fixed lens provides the base optical function, while separate attachments (manual focus ring, variable focus module) can be added to the lens barrel to provide additional focusing capabilities without complicating the core lens structure.
Solution Approach 2:
The code reader is designed with a universal lens mount that can accept multiple types of lens attachments. A single base unit can function with fixed focus, manual focus, or variable focus modes depending on which attachment is installed, making the system multi-functional and adaptable to different target distance requirements.
2Adaptability or versatility
If manual focus components are added to enable focus adjustment, then the reader can adapt to different distances, but mechanical parts are exposed to environmental conditions
Solution Approach 1:
The focus adjustment mechanism is extracted from the internal housing and placed in external removable lens attachments. The manual focus ring and variable focus module are separate components that attach to the lens barrel externally, keeping the internal code reader housing sealed and protected from environmental factors while still providing focus adjustment capability.
Solution Approach 2:
The mechanical focus adjustment system is replaced with a variable focus module that uses electrowetting technology. Instead of mechanical moving parts that expose internal components, electrical signals control the liquid lens element to adjust focus, eliminating the need for mechanical connections between the attachment and internal components.
3Adaptability or versatility
If variable focus modules with mechanical components are installed, then continuous focus adjustment is achieved, but the system becomes costly and prone to mechanical failure
Solution Approach 1:
The variable focus module replaces traditional mechanical focus adjustment mechanisms (motors, gears, moving lens elements) with an electrowetting-based liquid lens system. Electrical signals control the surface tension of the liquid lens to change its focal length continuously, eliminating mechanical wear and failure points while providing reliable continuous focus adjustment.
Solution Approach 2:
The focus adjustment is achieved by changing the electrical parameters (voltage) applied to the liquid lens rather than changing mechanical parameters. By varying the electrical signal, the liquid lens's optical properties change, providing continuous focus adjustment without mechanical movement or contact, thereby improving reliability.
4Adaptability or versatility
If multiple separate code readers are installed at different target distances, then complete coverage is achieved, but the system complexity and cost increase
Solution Approach 1:
Instead of installing multiple separate code readers for different target distances, a single code reader is designed with universal lens attachment capability. By installing different lens attachments (fixed focus for distant targets, variable focus for varying distances), one reader can replace multiple specialized readers, reducing system complexity and cost while maintaining complete target distance coverage.
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 modular focus system provides a cost-effective, compact, and reliable solution that can be easily transformed between fixed, manual, and variable focus modes, ensuring consistent image quality without the drawbacks of existing technologies.
Implementation Method 1
a variable focus lens module, able to be secured to the lens barrel such that a liquid lens disposed therein is electrically connected to the code reader
Data Source
AI summary
A modular focus system for image based code readers includes swappable lens attachments enables fixed focus, manual focus, and variable focus operation from a single reader. A manual focus lens cap includes a manually adjustable focus ring to change the focus of the reader. A variable focus lens module includes a liquid lens that is manipulated by a voltage delivered via a pair of electrodes to adjust the focus of the reader. The lens attachments can be swapped out and replaced as needed.