Chromatic Path Splitting for Multi-Plane Optical Code Imaging
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Solution Overview
Problem
Current barcode reading technologies, such as laser-based scanners and imager-based readers, have limitations in reading both one-dimensional and two-dimensional optical codes efficiently, with laser scanners being better suited for one-dimensional codes and imager-based readers for high-density codes, but lacking in multi-plane reading capabilities.
Innovation Solution
A data reading system with a bioptic configuration using dichroic mirrors and multiple light sources of different wavelengths to illuminate and reflect light from multiple angles onto an image sensor, allowing for simultaneous two-dimensional image capture and processing of optical codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser-based scanners are used, then one-dimensional barcode reading capability is improved, but two-dimensional code reading capability deteriorates
Solution Approach 1:
The imaging-based reader is designed to read both one-dimensional and two-dimensional optical codes using a single device. The system captures images of optical codes and processes them to decode both linear barcodes and matrix codes, eliminating the need for separate laser scanners for different code types.
Solution Approach 2:
The patent replaces the mechanical scanning mechanism of laser scanners with an imaging-based system that captures the entire code area at once. This substitution allows the system to handle both one-dimensional and two-dimensional codes effectively, as the imaging approach naturally accommodates various code geometries without mechanical movement.
2Adaptability or versatility
If imager-based readers are used, then two-dimensional code reading capability is improved, but one-dimensional code reading capability deteriorates
Solution Approach 1:
The imaging-based reader is designed to read both one-dimensional and two-dimensional optical codes using a single device. The system captures images of optical codes and processes them to decode both linear barcodes and matrix codes, eliminating the need for separate laser scanners for different code types.
3Adaptability or versatility
If bioptic configuration with multiple light sources is used, then multi-plane reading capability is improved, but device complexity increases
Solution Approach 1:
The system divides the illumination function into multiple segments by using separate light sources for different wavelength ranges. One light source illuminates in a first wavelength range while another illuminates in a second wavelength range, allowing simultaneous capture of multiple planes or angles through chromatic path splitting.
Solution Approach 2:
The patent introduces dichroic mirrors as intermediary elements that separate and direct different wavelength ranges to different optical paths. These mirrors act as mediators that enable the system to handle multiple light planes simultaneously by routing specific wavelengths to appropriate imaging paths.
4Reliability
If chromatic path splitting with dichroic mirrors is used, then depth of field is improved, but device complexity increases
Solution Approach 1:
The patent introduces dichroic mirrors as intermediary elements that separate and direct different wavelength ranges to different optical paths. These mirrors act as mediators that enable the system to handle multiple light planes simultaneously by routing specific wavelengths to appropriate imaging paths.
Solution Approach 2:
The system adds a spectral dimension to the optical path by using chromatic path splitting. Different wavelength ranges are directed along different paths, effectively adding a third dimension (wavelength) to the traditional two-dimensional spatial imaging, which enables multi-plane reading capabilities.
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
Enables efficient reading of both one-dimensional and two-dimensional optical codes with improved depth of field and multi-plane reading capabilities, combining the advantages of existing technologies.
Implementation Method 1
a first view of an object in a scan volume is directed towards an image sensor through a dichroic mirror reflecting a first wavelength range and transmitting a second wavelength range
Implementation Method 2
a first light source generating light of a first wavelength range and a second light source generating light of a second wavelength range
Implementation Method 3
Light reflecting off the item passes back through the lower window and is reflected by the dichroic mirror
Implementation Method 4
The light is focused by a lens system projecting a two-dimensional image onto the image sensor
Data Source
AI summary
An optical code or data imaging system and method for forming image data from an item bearing an optical code present in a read volume, including an image splitter, such as a dichroic mirror, operative to transmit light of a first wavelength range from a first field of view of the item toward the imager and reflect light of a second wavelength range from a second field of view of the item toward the imager. The incoming images from both the first and second fields of view are focused, at least primarily, by the same focusing optics and are detected by the same detecting portions or preferably at least some overlapping portions of the imager.