Stationary Ultrasound Transducer Array for Matrix Symbol Reading
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Solution Overview
Problem
Existing methods for reading matrix symbols, especially those directly marked on substrates using dot-peen or laser methods, face challenges with optical cameras and require mechanical movement in ultrasound-based systems, leading to inefficiencies and alignment issues.
Innovation Solution
A stationary ultrasound transducer with multiple elements forms image points to read matrix symbols, allowing for parallel processing, reduced mechanical distortions, and lower production costs, while constructing high-contrast images using feature extraction and pulse shape selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical cameras are used to read matrix symbols, then reading performance is good for printed symbols, but reading capability deteriorates for directly marked symbols
Solution Approach 1:
The patent replaces optical detection with ultrasound detection. Instead of using optical cameras that rely on light reflection and contrast, the invention uses ultrasound transducers to detect acoustic impedance differences between matrix symbol materials and substrate materials, enabling reading of directly marked symbols that are invisible or low-contrast to optical systems.
2Reliability
If a transducer is physically scanned over the substrate, then matrix symbols can be read, but reading speed is reduced and mechanical alignment issues occur
Solution Approach 1:
The patent replaces mechanical scanning with a stationary transducer array. Instead of moving a single transducer element across the substrate in a raster pattern, the invention uses multiple transducer elements fixed in an array configuration that simultaneously cover the entire matrix symbol area, eliminating mechanical movement entirely.
Solution Approach 2:
The patent divides the transducer into multiple independent elements arranged in an array. Each element can independently detect ultrasound signals from its corresponding region of the matrix symbol, enabling parallel processing and simultaneous acquisition of data from all symbol locations.
3Measurement precision
If mechanical scanning is used to read matrix symbols, then symbols can be detected, but geometrical distortions occur due to alignment issues
Solution Approach 1:
The patent eliminates mechanical scanning by using a stationary transducer array, thereby removing the source of geometrical distortions caused by mechanical alignment errors. The fixed geometric relationship between transducer elements and substrate positions ensures consistent spatial mapping without drift or misalignment.
4Productivity
If multiple transducer elements are used for parallel processing, then reading speed increases, but device complexity increases
Solution Approach 1:
The patent divides the transducer into multiple independent elements arranged in a regular array pattern. This segmentation enables parallel detection across the matrix symbol area, significantly increasing reading speed. The modular element structure allows for systematic signal processing and image reconstruction algorithms.
Solution Approach 2:
The transducer array serves multiple functions: it acts as both the sensing element and the positioning reference. The fixed geometric arrangement of elements provides inherent spatial encoding, eliminating the need for separate positioning systems and reducing overall device complexity despite the multiple elements.
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 approach enables faster, more robust reading and decoding of matrix symbols with improved image quality and reduced geometrical distortions, suitable for various substrates and marking methods without mechanical movement.
Implementation Method 1
Ultrasound as a means of reading matrix symbols is possible if that backscattered ultrasound signal corresponding to the matrix symbol differs from that corresponding to the substrate where the matrix symbol is comprised
Implementation Method 2
backscattered ultrasound signal corresponding to the matrix symbol differs from that corresponding to the substrate
Implementation Method 3
an ultrasound transducer which comprises transmitter and receiver electrodes
Data Source
AI summary
There is provided an apparatus and method for reading matrix codes comprising an ultrasound transducer 20 which comprises transmitter and receiver electrodes, a receiver unit 24 connected to the receiver electrodes for processing the signals received by the receiver electrodes, and a transmitter module 21 connected to the transmitter electrodes, the transmitter module transferring an electronic signal to the transducer, where the signal shape is selected between a number of signal shapes according to the characteristics of the matrix code to be read.