Vehicle Mirror Heating Section Gradient Design
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Solution Overview
Problem
Existing heated mirrors experience stress at the outer peripheral portion due to uneven heating, which can lead to cracking and performance issues.
Innovation Solution
A mirror design with a heating section that varies heating density from the central side to the outer peripheral side by adjusting the cross-sectional area of the heat generation body and the spacing between electrodes, ensuring lower heating density at the edges to prevent sudden temperature rises and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uniform heating is applied across the mirror body, then the heating efficiency is improved, but stress arises at the outer peripheral portion
Solution Approach 1:
The heating section applies different heating densities to different regions of the mirror body. The central region receives higher heating density while the outer peripheral region receives lower heating density, optimizing both heating efficiency and stress prevention locally in each region.
Solution Approach 2:
The heating density parameter is varied across the mirror body surface. By changing the heating density from uniform to gradient distribution (higher at center, lower at edges), the system achieves both efficient heating and stress reduction.
2Temperature
If high heating density is applied to the outer peripheral portion, then the temperature rise is improved, but stress and cracking occur
Solution Approach 1:
The heating section is designed to preemptively reduce heating density at the outer peripheral portion before stress and cracking can occur. This preliminary adjustment in heating distribution prevents the adverse effect of thermal stress while maintaining adequate temperature rise.
3Productivity
If the heating section heats the entire mirror body uniformly, then the frost melting performance is improved, but the mirror body experiences thermal stress
Solution Approach 1:
The heating section provides differentiated heating to different regions: higher heating density in the central region where frost accumulation is typically greater, and lower heating density at the outer peripheral region to prevent thermal stress, thereby maintaining both frost melting performance and mirror reliability.
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 design effectively suppresses stress and cracking at the outer peripheral portion while maintaining efficient frost melting and condensation drying, enhancing the mirror's performance and longevity.
Implementation Method 1
a heat generation body that is provided at the heating section, and that generates heat so as to enable heating of the heated region of the mirror body
Implementation Method 2
a heating section that is configured to heat a heated region in a plate face of the mirror body
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
In a vehicle mirror 10, a heat generating body 22 of a heater 14 generates heat so as to heat a mirror body 12. A central side portion and an outer peripheral side portion of the heat generating body 22 configure a thick portion 24 and a thin portion 26, and the thin portion 26 generates a smaller amount of heat than the thick portion 24, such that a heating density of the mirror body 12 by the heat generating body 22 is lower on an outer peripheral side portion of the mirror body 12 than at a central side portion of the mirror body 12. Accordingly, the temperature of an outer peripheral portion of the mirror body 12 can be suppressed from rising suddenly on progression from the outer peripheral side toward the central side of the mirror body 12, thereby enabling stress arising in the outer peripheral portion of the mirror body 12 to be suppressed.