Non-Orthogonal Camera Assemblies for Bar Code Scanning Volume
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Solution Overview
Problem
Conventional multicamera imaging-based bar code readers have limited scanning volumes due to symmetric camera assembly configurations, which fail to effectively cover the desired imaging field, especially when target bar codes are positioned adjacent to but facing away from the presentation windows.
Innovation Solution
The use of non-orthogonal camera assemblies, where the sensor array is tilted with respect to the optical axis of the imaging lens assembly, results in a non-symmetric scanning volume that encompasses a greater portion of the desired imaging field, including areas previously uncovered by conventional symmetric camera assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional symmetric camera assemblies are used, then the device structure is simple and easy to manufacture, but the scanning volume is limited and cannot effectively cover the desired imaging field
Solution Approach 1:
The patent applies asymmetry by configuring the sensor array non-orthogonally with respect to the optical axis of the imaging lens assembly. This non-orthogonal arrangement creates a non-symmetric scanning volume that extends further in certain directions, allowing the camera assembly to cover a larger portion of the desired imaging field, particularly areas adjacent to and facing away from presentation windows that conventional symmetric assemblies cannot effectively reach.
2Adaptability or versatility
If non-orthogonal camera assemblies are used, then the imaging field coverage is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by deliberately altering the angular relationship between the sensor array and optical axis from the conventional orthogonal configuration to a non-orthogonal configuration. This parameter change transforms the scanning volume geometry to achieve superior imaging field coverage. The specific non-orthogonal angle is optimized to maximize coverage of previously inaccessible areas while maintaining feasible manufacturing tolerances.
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 configuration enhances the ability to image and decode bar codes regardless of orientation, providing a more comprehensive and effective imaging field, thereby improving the reader's ability to capture bar codes positioned in any direction relative to the presentation windows.
Implementation Method 1
an imaging lens assembly of the camera assembly such that an imaging or scanning volume of the camera assembly
Implementation Method 2
a sensor array of the camera assembly is non-orthogonal with an optical axis of an imaging lens assembly
Data Source
AI summary
A multicamera imaging-based bar code reader wherein for least one camera assembly of the reader, a sensor array of the camera assembly is non-orthogonal with respect to an optical axis of an imaging lens assembly of the camera assembly such that an imaging or scanning volume of the camera assembly more closely conforms to a desired imaging field or region of the reader. In one exemplary embodiment the reader features: a housing supporting first and second transparent presentation windows and defining an interior region; an imaging system including a plurality of camera assemblies within the interior region, at least one camera assembly includes a sensor array and an imaging lens assembly, the sensor array being positioned with respect to the imaging lens assembly at an angle so as to be non-orthogonal with respect to an optical axis of the imaging lens assembly of the camera assembly.