Dual-Angle Hologram Image Reading Device
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Solution Overview
Problem
Existing image reading devices for holograms, such as those described in JP-A-2000-293105 and JP-A-2006-39996, face challenges in accurately identifying holograms due to insufficient focusing and incomplete reading of light penetration, leading to inadequate identification at both macro and micro levels.
Innovation Solution
An image reading device is designed with a conveying unit and two light sources applied at different angles along the conveying path, using a light guide and lens arrays to converge reflected lights for detection by separated sensors, enabling precise discrimination of hologram authenticity by comparing output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light source and sensor configuration is used, then the device structure is simple, but the hologram identification precision is insufficient at both macro and micro levels
Solution Approach 1:
The patent divides the reading system into multiple segments: multiple light sources (first and second light sources) positioned at different angles, multiple sensors (first and second image sensors) separated by a prescribed distance, and separate lens arrays for each path. This segmentation enables multi-angle illumination and detection, resolving the contradiction by trading increased structural complexity for significantly improved hologram identification precision at both macro and micro levels.
Solution Approach 2:
The patent applies different local qualities to different parts of the system: light sources are positioned at specific angles relative to the conveying direction, sensors are placed at separated positions, and lens arrays are configured with specific focal lengths. Each component has optimized local characteristics that contribute to overall measurement precision, allowing the system to capture hologram information from multiple perspectives simultaneously.
2Measurement precision
If lights are applied from a single angle, then the optical path is simple, but the spectrum difference detection capability is insufficient for accurate authenticity discrimination
Solution Approach 1:
The patent employs asymmetric optical path configuration where the first light source and second light source are positioned at different angles relative to the conveying direction of the irradiated member. This asymmetric arrangement creates different illumination paths that reflect spectrum differences in the hologram area, enabling accurate authenticity discrimination while maintaining a manageable optical path structure.
Solution Approach 2:
The patent adds an angular dimension to the optical path by positioning light sources at different angles rather than using a single overhead source. This dimensional change allows the system to detect spectrum differences that are invisible to single-angle illumination, significantly improving measurement precision without creating an overly complex optical path.
3Measurement precision
If no lens array is used, then the device structure is simple, but the focusing position and read position cannot be determined, resulting in insufficient identification
Solution Approach 1:
The patent introduces lens arrays as intermediary components between the light sources and the hologram area, and between the hologram area and the image sensors. These lens arrays serve as mediators that focus the reflected light from the hologram area onto the sensors at determined read positions, resolving the contradiction by providing necessary focusing capability while keeping the overall system structure manageable.
Solution Approach 2:
The lens arrays are pre-configured with specific focal lengths and positions to ensure that light reflected from the hologram area is focused onto the image sensors at the correct read positions before detection occurs. This preliminary focusing action ensures accurate position determination and eliminates the need for complex real-time adjustment mechanisms.
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 allows for accurate and detailed discrimination of hologram authenticity, even for finely formed patterns, by effectively capturing and comparing the spectrum differences in reflected lights, enhancing the identification process beyond previous limitations.
Implementation Method 1
lights reflected by the hologram area are respectively received to detect an electric signal of the hologram area
Implementation Method 2
a lens array for converging the lights of the one and the other light sources reflected by the irradiated part of the hologram area
Implementation Method 3
a light guide part for guiding the light to the irradiated part
Data Source
AI summary
An image reading device having a conveying unit for conveying an irradiated member that has a hologram area in a conveying direction; a first light source for applying light to an irradiated part in the hologram area; and a second light source separated from the first light source along the conveying direction and applying light to an irradiated part in the hologram area when the hologram area is conveyed by a prescribed distance. An irradiation angle at which the irradiated part is irradiated with the light of the first light source is made to be different from an irradiation angle at which the irradiated part is irradiated with the light of the second light source when the hologram part is conveyed by the prescribed distance. Lights reflected by the hologram area are respectively received to detect an electric signal of the hologram area of the irradiated member.