Photodetector for Fluorescent Toner Detection in Printers
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Solution Overview
Problem
The quality of printed images in electrophotographic printers depends on matching toner type and printing conditions, and existing systems lack efficient methods to identify and adjust for toner properties in real-time, leading to potential variations in image quality and security document integrity.
Innovation Solution
Incorporating a photodetector that emits light in an invisible wavelength band to detect fluorescent additives in the toner, allowing for accurate identification of toner type and adjustment of printing parameters, including the use of quantum dot-encoded additives for improved light resistance and luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photodetector is used to detect fluorescent additives in toner, then toner identification accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces a photodetector as an intermediary device that detects fluorescent additives in toner through light emission and reception. This intermediary component enables accurate toner identification without requiring direct complex analysis of toner composition, thereby improving measurement precision while managing device complexity through a dedicated detection module
2Stability of the object's composition
If printing conditions are adjusted based on toner type identification, then image quality stability is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent utilizes fluorescent additives that exhibit specific light emission characteristics (color changes in the optical domain) when excited. This allows for easy detection of toner type through optical properties rather than complex chemical or physical analysis, thereby improving image quality stability through accurate toner identification while avoiding difficult measurement processes
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
Ensures stable and high-quality image production by accurately determining toner properties and adjusting printing conditions, enhancing image density correction and security document integrity by minimizing external light interference and improving detection accuracy.
Implementation Method 1
a photodetector that emits light in an invisible wavelength band to detect fluorescent additives in the toner
Implementation Method 2
detect fluorescent additives in the toner
Data Source
AI summary
An example photodetector for detecting fluorescent toner includes a light emitting unit to emit light to a toner image, and a light receiving unit. The light receiving unit is to detect visible light reflected by the toner image, detect that the toner image includes the fluorescent toner based on the detection of the visible light, the visible light generated by the fluorescent toner and having a predetermined wavelength band different from a wavelength band of the emitted light, and output a signal corresponding to the detection of the fluorescent toner.