Optical Sensor Light Interference Reduction
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Solution Overview
Problem
Existing bill processing apparatuses face challenges in accurately reading and authenticating paper sheets with bar codes due to light interference from multiple light sources, which affects the reliability of authenticity judgments.
Innovation Solution
A paper sheet processing apparatus is designed with a first sensor and a second sensor, each emitting light in different directions to minimize interference, allowing for accurate reading and authentication of paper sheets by using distinct light paths for transmission and reflection data collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple optical sensors with light emitting diodes are installed in parallel to read paper sheets, then the reading capability is enhanced, but light interference between adjacent sensors occurs affecting measurement precision
Solution Approach 1:
The patent extracts and eliminates the harmful light interference between adjacent optical sensors by introducing light-shielding partitions. These partitions selectively block the light paths between sensors while preserving the light paths from the paper sheet to each sensor, thereby maintaining reading capability while improving measurement precision for authenticity judgment.
Solution Approach 2:
The light-shielding partition acts as an intermediary element between adjacent optical sensors. It mediates the light paths by blocking interfering light from neighboring sensors while allowing the desired light from the paper sheet to reach each sensor, thus resolving the contradiction between enhanced reading capability and accurate measurement.
2Measurement precision
If light-shielding partitions are added between optical sensors, then light interference is reduced improving authenticity judgment accuracy, but device complexity increases
Solution Approach 1:
The light-shielding partitions are strategically placed only in the specific regions where light interference occurs between adjacent sensors, rather than uniformly across the entire sensor array. This localized approach improves authenticity judgment accuracy by blocking interference paths while minimizing the addition of structural complexity.
Solution Approach 2:
The patent introduces light-shielding partitions in the spatial dimension between adjacent sensors, effectively adding a new dimensional element to control light paths. This approach addresses the interference problem by utilizing the third dimension (depth/spacing) rather than complicating the two-dimensional sensor layout, thus improving accuracy with minimal increase in overall device complexity.
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 accuracy of authenticity judgments by reducing light interference, enabling effective reading and validation of both bills and bar-coded paper sheets, improving the reliability of the authentication process.
Implementation Method 1
each of the respective optical sensors has a structure in which a light emitting diode and a light receiving transistor are installed in parallel in a case, and is configured to receive a light reflected on the bottom surface and top surface of each bill
Data Source
AI summary
When individual light emitting diodes of respectively-juxtaposed optical sensors are simultaneously caused to emit light, individual light receiving transistors therefor may be subjected to influences of the light from other light emitting diodes. Therefore, a paper sheet processing apparatus which can read an identification object accurately is provided. The bill processing apparatus (1) includes: a first sensor (8) having a first light emitting part (8a) for irradiating the identification object with light and a first light receiving part (8b) for receiving the light from the first light emitting part (8a), and a second sensor (88) having a second light emitting part (88a) for irradiating light in a direction different from that of the first light emitting part (8a) and a second light receiving part (88b) for receiving the light from the second light emitting part (88a).