Image Sensor Ultraviolet Cut Part and Detection for Intensity Correction
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Solution Overview
Problem
The ultraviolet light LED light source in existing optical line sensor devices experiences irradiation intensity reduction due to deterioration, which cannot be corrected because the filter used to detect visible light also blocks ultraviolet light reflected by a white reference, preventing the image sensor from accurately measuring the irradiation intensity.
Innovation Solution
An image sensor unit with a light source that emits ultraviolet light, a light condenser, and an ultraviolet cut part that allows fluorescent light to pass through while blocking ultraviolet light, along with an ultraviolet detection part to measure the reflected ultraviolet light from a reflecting part, enabling the correction of irradiation intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an ultraviolet cut part is disposed between the object to be illuminated and the image sensor to cut off ultraviolet light and allow fluorescent light to transmit, then the capability of detecting the fluorescent image is improved, but the ability to detect ultraviolet light reflected by the white reference is lost, making it impossible to correct the irradiation intensity of the ultraviolet light source
Solution Approach 1:
The image sensor is divided into two distinct detection parts: an ultraviolet detection part that detects ultraviolet light for irradiation intensity correction, and a visible light detection part that detects fluorescent light for image reading. This segmentation allows each part to perform its specialized function without interference from the ultraviolet cut part, resolving the contradiction between fluorescent image detection and irradiation intensity correction.
Solution Approach 2:
A beam splitter is introduced as an intermediary optical element that separates ultraviolet light and visible light paths. The beam splitter directs ultraviolet light to the ultraviolet detection part and visible light to the visible light detection part, enabling both detection functions to coexist despite the presence of the ultraviolet cut part in the visible light path.
2Measurement precision
If the ultraviolet light LED light source is used to read fluorescent images, then the ability to excite fluorescent materials is improved, but the irradiation intensity decreases due to deterioration with age, reducing the luminance of the read image
Solution Approach 1:
The ultraviolet detection part continuously monitors the irradiation intensity of the ultraviolet light source and provides feedback to a correction unit. The correction unit adjusts the reading of the visible light detection part based on this feedback, compensating for age-related deterioration of the ultraviolet LED light source and maintaining consistent image quality.
Solution Approach 2:
The system dynamically changes the correction parameter applied to the fluorescent image reading based on the measured irradiation intensity. As the ultraviolet LED deteriorates and its intensity decreases, the correction parameter is adjusted to compensate, maintaining the effective luminance and detection precision of the read images.
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
The solution effectively corrects the irradiation intensity of the ultraviolet light source, ensuring consistent image quality despite age-related deterioration, by allowing detection of ultraviolet light reflected from a reference material.
Implementation Method 1
allows fluorescent light to transmit therethrough, the fluorescent light having been caused from a fluorescent material irradiated with ultraviolet light
Implementation Method 2
a light condenser that focuses light from the object to be illuminated
Implementation Method 3
an image sensor that converts the light focused by the light condenser, into an electric signal
Data Source
AI summary
An image sensor unit (60) includes: a light source part (25) that emits at least ultraviolet light in a main-scan direction to an object to be illuminated; a light condenser (32) that focuses light from the object to be illuminated; an image sensor (75) that converts the light focused by the light condenser (32), into an electric signal; and an ultraviolet cut part (65) that is disposed between the object to be illuminated and the image sensor (75), cuts off ultraviolet light in light reflected by the object to be illuminated, and allows fluorescent light to transmit therethrough. The image sensor (75) includes an ultraviolet detection part (77) that detects light in the ultraviolet light emitted from the light source part (25), the detected light having been reflected by a reflecting part but having not transmitted through the ultraviolet cut part (65).