Sequential Light Switching in Image Reading for Single-Pass Scanning
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Solution Overview
Problem
Existing image reading operations require time-consuming processes for each light source, necessitating multiple scans to combine image signals, which can lead to increased reading time and potential operator errors.
Innovation Solution
An image reading device with multiple light sources that irradiate at different angles, utilizing a switching mechanism to sequentially switch light incidence during a single scanning operation, reducing the need for multiple scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light sources are used to irradiate the image reading target at different angles, then image quality and texture information are improved, but image reading time increases due to multiple scanning operations
Solution Approach 1:
The patent combines multiple light source irradiation operations into a single scanning operation by sequentially switching between light sources during one pass over the image reading target. This merging of operations maintains the quality benefits of multiple light angles while eliminating the time penalty of multiple separate scans.
Solution Approach 2:
The patent introduces dynamic switching between light sources during the scanning operation. The light sources are activated in sequence rather than simultaneously or in separate passes, allowing the system to adaptively capture different surface characteristics (specular vs. diffuse reflection) in a single dynamic scanning process.
2Reliability
If multiple light sources are used to capture both specular and diffuse reflected light, then reliability of image data is improved, but device complexity increases
Solution Approach 1:
The patent makes a single scanning mechanism universal by enabling it to perform multiple functions: capturing both specular and diffuse reflected light from different surface areas through sequential light source switching. This eliminates the need for separate scanning operations and reduces overall system complexity while maintaining data reliability.
Solution Approach 2:
The patent changes the operational parameters of the light sources (activation timing, intensity, angle) during a single scanning operation to achieve different imaging goals. By dynamically adjusting which light source is active and at what intensity, the system reliably captures both surface types without adding physical complexity.
3Productivity
If sequential switching of light sources is implemented during a single scan, then productivity is improved, but control complexity increases
Solution Approach 1:
The patent implements periodic switching between light sources during the scanning operation, with each light source activated for specific durations corresponding to different scanning regions. This periodic action pattern simplifies control logic compared to continuous adjustment while maintaining high productivity through single-pass operation.
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 significantly reduces image reading time, enhances productivity, and minimizes operator errors by allowing simultaneous acquisition of texture and color information in a single scan.
Implementation Method 1
a first imaging unit that images diffused reflected light from the image pick-up target irradiated with the light by the irradiation unit, a second imaging unit that images specularly reflected light from the image pick-up target irradiated with the light by the irradiation unit
Data Source
AI summary
An image reading device includes plural light sources that irradiate an image reading target with light at different angles; and a switching mechanism that sequentially switches the light incident to the image reading target from the plural light sources during an image reading operation on the image reading target.