Optical Linear Sensor Ultraviolet Measurement
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Solution Overview
Problem
The existing optical linear sensor units face challenges in accurately measuring ultraviolet light due to fluorescent member deterioration and potential color filter degradation when exposed to ultraviolet light, which affects image correction of paper sheets.
Innovation Solution
An optical linear sensor unit configuration that includes a reflective member, an ultraviolet light blocking filter, and a color filter, where ultraviolet light is reflected by the reflective member and measured directly by the light-receiving unit without passing through the color filter, allowing for accurate ultraviolet light measurement and preventing color filter deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fluorescent member is used to measure ultraviolet light amount, then the ultraviolet light amount can be measured, but the fluorescent member deteriorates due to long-term ultraviolet light irradiation
Solution Approach 1:
The patent extracts the ultraviolet light measurement function from the fluorescent member-based system. By using a reflective member to reflect ultraviolet light directly onto the light-receiving unit, the system eliminates the need for fluorescent members that deteriorate under continuous ultraviolet irradiation, thus maintaining measurement precision while improving reliability.
Solution Approach 2:
The reflective member acts as an intermediary between the ultraviolet light source and the light-receiving unit. Instead of using a fluorescent member that absorbs and re-emits ultraviolet light (causing deterioration), the reflective member simply reflects the ultraviolet light directly, avoiding the chemical processes that lead to degradation while still enabling accurate measurement.
2Adaptability or versatility
If ultraviolet light is allowed to pass through the color filter to reach the light-receiving unit, then the color filter can be used for visible light transmission, but the color filter deteriorates due to ultraviolet light exposure
Solution Approach 1:
The patent segments the optical path into distinct regions: a first region for ultraviolet light measurement without the color filter, and a second region for visible light transmission through the color filter. This spatial segmentation allows the color filter to perform its visible light transmission function while protecting it from ultraviolet light exposure that would cause deterioration.
Solution Approach 2:
The ultraviolet light blocking filter serves as an intermediary element that protects the color filter from ultraviolet light exposure. By placing this blocking filter between the ultraviolet light source and the color filter, the system enables the color filter to maintain its visibility transmission function while preventing ultraviolet-induced deterioration.
3Reliability
If an ultraviolet light blocking filter is placed before the color filter, then the color filter is protected from ultraviolet light, but the ultraviolet light cannot reach the light-receiving unit for measurement
Solution Approach 1:
The patent divides the optical path into separate regions: the first region receives reflected ultraviolet light directly without passing through the color filter or ultraviolet blocking filter, enabling measurement. The second region receives visible light through the color filter for image capture. This segmentation allows both ultraviolet measurement and color filter protection to coexist.
Solution Approach 2:
The patent utilizes the spatial dimension by positioning the reflective member and light-receiving unit in a configuration where ultraviolet light can reach the light-receiving unit through reflection without passing through the color filter. This dimensional arrangement allows the ultraviolet blocking filter to protect the color filter while still enabling ultraviolet measurement through the reflective path.
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
Enables accurate measurement of ultraviolet light without a fluorescent member, thereby correcting images and preventing color filter deterioration, ensuring reliable authentication of paper sheets.
Implementation Method 1
a reflective member, an ultraviolet light blocking filter, and a color filter, wherein a reflective member is disposed on an optical path from the linear light source to the lens array
Implementation Method 2
an ultraviolet light blocking filter, provided closer to the light-receiving unit than the reflective member, and configured to block ultraviolet light from entering the light-receiving unit
Implementation Method 3
a color filter, provided closer to the light-receiving unit than the ultraviolet light blocking filter, and configured to allow visible light in a specific wavelength range to pass through the color filter
Implementation Method 4
a lens array, and a light-receiving unit, wherein the lens array guides light from the illuminated paper sheet, and the light-receiving unit receives light
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A reflective member 17 is disposed on the optical path from the linear light source to the lens array 11. An ultraviolet light blocking filter 15 is provided closer to a light-receiving unit 12 than the reflective member 17. A color filter 18 is provided closer to the light-receiving unit 12 than the ultraviolet light blocking filter 15. A light-receiving surface 12A of the light-receiving unit 12 has a first region 121 opposed to the reflective member 17 without the ultraviolet light blocking filter 15 and the color filter 18 interposed therebetween, a second region 122 opposed to the reflective member 17 and the ultraviolet light blocking filter 15 without the color filter 18 interposed therebetween, and a third region 123 opposed to the reflective member 17, the ultraviolet light blocking filter 15, and the color filter 18.