Media Transparency Detection Using Dynamic Light Emission Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing media detection sensors struggle to accurately differentiate between transparent and non-transparent media, leading to potential misdetection and high operational costs, especially in environments where both types of media coexist.
Innovation Solution
A media determining apparatus using a transmission sensor with a light emitting device and a light receiving device, where the control section compares output voltages before, during, and after medium detection to determine transparency, allowing for accurate detection of both transparent and non-transparent media by adjusting the emission amount of the light emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a transmission sensor with fixed light emission is used to detect non-transparent media, then non-transparent media can be detected, but transparent media cannot be detected due to collapsed output voltage
Solution Approach 1:
The patent applies dynamics by making the light emission amount adjustable rather than fixed. The control section dynamically changes the light emission intensity from the light emitting device based on the detected output voltage level. When transparent media is detected (indicated by collapsed output voltage), the system increases light emission to restore detectability, thereby enabling versatile detection across both transparent and non-transparent media types.
Solution Approach 2:
The patent changes the parameter of light emission intensity to resolve the detection problem. By adjusting the light emission amount from the light emitting device, the system can adapt to different media transparency levels. This parameter change allows the output voltage to be maintained within a detectable range regardless of whether the media is transparent or non-transparent, achieving both high measurement precision and broad adaptability.
2Measurement precision
If high emission amount is used to detect transparent media, then transparent media detection is possible, but non-transparent media detection becomes unreliable
Solution Approach 1:
The system dynamically adjusts light emission intensity based on real-time output voltage feedback. When non-transparent media is detected (output voltage within normal range), the system reduces light emission to appropriate levels, ensuring reliable detection. This dynamic adjustment prevents the collapsed voltage issue while maintaining accurate transparent media detection capability.
Solution Approach 2:
The patent implements feedback control where the control section monitors the output voltage from the light receiving device and adjusts the light emission amount accordingly. This closed-loop feedback mechanism ensures that light emission is optimized for the current media type being detected, maintaining both transparent and non-transparent media detection reliability through continuous adaptation.
3Measurement precision
If conventional sensors are used to differentiate media types, then detection is possible, but cost increases significantly
Solution Approach 1:
The patent replaces expensive specialized transparent media detection sensors with a conventional transmission sensor combined with dynamic light emission control. This substitution uses readily available, low-cost components (standard light emitting device and light receiving device) to achieve the same functional capability, significantly reducing system cost while maintaining media type differentiation accuracy.
Solution Approach 2:
The system achieves media type differentiation through parameter changes in light emission intensity rather than through expensive specialized hardware. By controlling the light emission amount and analyzing output voltage responses, the system can distinguish between transparent and non-transparent media using simple, low-cost transmission sensor technology, avoiding the need for expensive specialized sensors.
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 cost-effective detection of medium transparency and front-end position, ensuring high printing position accuracy irrespective of media type, by using inclined sensors to differentiate output voltages and adjust emission levels accordingly.
Implementation Method 1
a light emitting device (LED) and a light receiving device (phototransistor) have been widely used
Implementation Method 2
a sensor having a light emitting device and a light receiving device... the microprocessor is capable of capturing the output voltage of the collector of the phototransistor
Data Source
AI summary
To provide a media determining apparatus for enabling transparency of a medium to be determined at low cost, the media determining apparatus is provided with a transport section that transports a medium, a sensor including a light emitting device and a light receiving device to detect the medium, and a control section that detects the medium transported with the transport section corresponding to an output voltage of the sensor. The control section determines transparency of the medium by comparing the output voltage A of the sensor before a front end of the medium arrives at a detection position of the sensor, the output voltage B of the sensor when the front end arrives at the detection position, and the output voltage C of the sensor after the front end arriving at the detection position.