Sensor Cover Heater Layout for Lens Droplet Removal
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Solution Overview
Problem
Existing optical devices face challenges in efficiently heating transmission portions, such as lenses, to remove water droplets or other foreign matter using heater portions, leading to inefficient heating and potential interference with thermistor measurements.
Innovation Solution
The heater portion is strategically disposed on the lower side and one lateral side of the transmission portion, with higher heat generation per unit length on the lower side compared to the lateral side, promoting efficient heating and reducing interference with thermistor measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heater portion is disposed to heat the transmission portion, then foreign matter such as water droplets can be removed, but the heating efficiency is insufficient and thermistor measurements are interfered with
Solution Approach 1:
The heater portion is configured with non-uniform heat generation characteristics, where the heat generation per unit length in the first direction (along the outer periphery on the lower side) is higher than in the second direction (along the outer periphery on the lateral side). This local quality variation optimizes heating efficiency by concentrating heat where most needed while reducing interference with thermistor measurements in other areas.
Solution Approach 2:
The heater portion employs an asymmetric configuration where the heat generation amount differs between different directions. Specifically, the heat generation per unit length is higher in the direction along the outer periphery on the lower side compared to the direction along the outer periphery on the lateral side, creating an asymmetric heating pattern that improves overall heating efficiency.
2Productivity
If uniform heat generation is used across the heater portion, then simple design is achieved, but heating efficiency is reduced and thermistor measurement interference increases
Solution Approach 1:
The heater portion implements local quality by having different heat generation characteristics in different regions. The heat generation per unit length varies between the first direction (higher heat generation on the lower side) and the second direction (lower heat generation on the lateral side), optimizing heating efficiency without requiring complex multi-component designs.
Solution Approach 2:
The heater portion utilizes parameter changes by varying the heat generation amount per unit length in different directions. This is achieved through designing the heater structure (such as winding density or resistance distribution) to produce higher heat generation in the first direction and lower heat generation in the second direction, thereby improving heating efficiency through parameter optimization rather than structural complexity.
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
This configuration enhances heating efficiency and minimizes interference with thermistor measurements, ensuring effective removal of foreign matter while maintaining accurate temperature control.
Implementation Method 1
a heater portion of which at least a portion is disposed on a lower side of the transmission portion and on one of opposite lateral sides of the transmission portion
Implementation Method 2
A temperature of the lens heated by the heater portion is controlled by measuring the temperature of the lens using the thermistor portion
Data Source
AI summary
A cover portion (300) includes a transmission portion (310) and a heater portion (320). At least a portion of the heater portion (320) is disposed on a lower side (negative side of a sixth direction (V)) of the transmission portion (310) and on one of opposite lateral sides (positive side of a fifth direction (L)) of the transmission portion (310). An amount of heat generated per unit length of the heater portion (320) in a direction along an outer periphery of the transmission portion (310) on the lower side (negative side of the sixth direction (V)) of the transmission portion (310) is higher than an amount of heat generated per unit length of the heater portion (320) in a direction along the outer periphery of the transmission portion (310) on the one of the opposite lateral sides (positive side of the fifth direction (L)) of the transmission portion (310).


