Light Transmitter Vibration Control for Accurate Temperature Sensing
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Solution Overview
Problem
Conventional techniques for estimating the temperature of a light transmitter in imaging devices are inaccurate due to the impedance being dependent on both temperature and the amount of foreign matter attached, making it difficult to distinguish between temperature changes and foreign matter attachment.
Innovation Solution
A vibration device and method that determine a high-frequency-band resonant frequency to estimate the temperature of the light transmitter, using a controller to drive a vibrator within a high frequency band of at least 100 kHz, and adjust vibration frequencies to accurately assess and remove foreign matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If impedance response measurement is used to estimate temperature, then temperature estimation can be performed, but the estimation accuracy deteriorates due to foreign matter attachment affecting impedance
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands (low frequency band below 100 kHz and high frequency band 100 kHz or higher) and measures resonant frequency in each band separately. By comparing the resonant frequencies across different frequency bands, the system can distinguish between temperature-induced frequency shifts and foreign matter-induced frequency shifts, thereby resolving the contradiction between being able to perform temperature estimation and maintaining accuracy despite foreign matter presence.
Solution Approach 2:
The patent changes the measurement parameter from single-frequency impedance response to multi-frequency-band resonant frequency comparison. By measuring resonant frequencies in both low and high frequency bands and analyzing their relationship, the system transforms the temperature estimation problem into a differential measurement that eliminates the confounding effect of foreign matter attachment on impedance.
2Productivity
If vibration frequency is changed to remove foreign matter, then foreign matter removal effectiveness improves, but temperature estimation accuracy may deteriorate
Solution Approach 1:
The patent performs preliminary temperature estimation by measuring resonant frequencies in both low and high frequency bands before initiating foreign matter removal operations. This preliminary measurement establishes a baseline temperature that can be used for comparison after cleaning operations, ensuring that temperature estimation accuracy is maintained even as vibration frequency changes during foreign matter removal.
Solution Approach 2:
The patent implements a feedback mechanism where temperature is continuously estimated by comparing resonant frequencies across frequency bands, and this temperature information feeds back to control the vibration frequency adjustments. This allows the system to distinguish between resonant frequency changes caused by temperature variations and those caused by foreign matter removal, maintaining accurate temperature estimation throughout the cleaning process.
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 more accurate temperature estimation and effective removal of foreign matter from the light transmitter, improving image clarity by distinguishing between temperature changes and foreign matter attachment.
Implementation Method 1
a vibrator to vibrate the light transmitter
Implementation Method 2
a driver to drive the vibrator
Implementation Method 3
determine a high-frequency-band resonant frequency of the vibrator
Data Source
AI summary
A vibration device includes a light transmitter, a vibrator to vibrate the light transmitter, a driver to drive the vibrator, and a controller configured or programmed to control the driver and determine a high-frequency-band resonant frequency of the vibrator according to a state of the driver obtained by changing a drive frequency of the driver within a high frequency band higher than or equal to about 100 kHz, and estimate a temperature of the light transmitter from the determined high-frequency-band resonant frequency.