Rear-View Mirror Glass Structure for Thin Arcuate Edge Compliance
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Solution Overview
Problem
The existing rear-view mirror and vehicle-mounted display devices require a glass plate with an arcuate shape at the outer circumferential edge, which increases the thickness and weight, and subsequently the cost, while maintaining the arcuate shape is essential to meet regulatory requirements.
Innovation Solution
A combination of a glass plate with a first arcuate surface and a casing with a second arcuate surface, where the center and radius of both surfaces are identical, supports the glass plate from the rear surface side, forming a continuous arcuate shape that reduces the glass plate's thickness while maintaining the required arcuate shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the thickness of the glass plate is increased to maintain the arcuate shape at the outer circumferential edge, then the arcuate shape is maintained, but the weight and cost increase
Solution Approach 1:
The invention divides the arcuate shape formation into two separate components: the glass plate and the casing. The glass plate has a first arcuate surface at its outer circumferential edge, while the casing has a second arcuate surface that matches the first. This segmentation allows each component to be optimized independently - the glass plate can be thinner while the casing provides the remaining arcuate geometry, thus maintaining the overall arcuate shape without increasing glass thickness and weight.
Solution Approach 2:
The invention merges the arcuate surfaces of the glass plate and casing to form a continuous, unified arcuate shape. The first arcuate surface of the glass plate and the second arcuate surface of the casing are positioned adjacent to each other, creating a seamless transition that maintains the required arcuate geometry while allowing the glass plate to be thinner than if it had to provide the entire arcuate shape alone.
2Shape
If the thickness of the glass plate is increased to maintain the arcuate shape, then the arcuate shape is maintained, but the cost increases
Solution Approach 1:
By segmenting the arcuate shape provision between the glass plate and casing, the invention reduces the thickness requirement for the glass plate. This segmentation allows the glass plate to be manufactured at a reduced thickness, directly lowering material costs and manufacturing expenses associated with thicker glass while still achieving the required arcuate shape through the combined structure.
3Weight of moving object
If the glass plate thickness is reduced, then weight and cost are reduced, but the arcuate shape may not be maintained
Solution Approach 1:
The invention combines the first arcuate surface of the glass plate with the second arcuate surface of the casing to form a continuous arcuate shape. This merging ensures that even when the glass plate is thinner, the overall structure maintains the required arcuate geometry through the complementary contribution of the casing's arcuate surface, thus preserving the shape while reducing weight.
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 solution reduces the thickness and weight of the glass plate while ensuring it meets the regulatory requirements for arcuate shape, enhancing the strength against collisions and reducing costs, while maintaining the necessary arcuate shape and visibility.
Implementation Method 1
a reflective layer provided between the casing and the glass plate
Data Source
AI summary
A vehicle-mounted display device includes a glass plate that includes a first arcuate surface at a first outer circumferential edge part, the first arcuate surface facing a front surface side, a casing that supports the glass plate from a rear surface side, the casing including a housing and a frame that projects from the housing, and a display unit stored in the casing configured to output a display light toward the glass plate. A rear surface of the glass plate and a front surface of the frame face each other at a spaced distance. The frame further includes a projection that projects, within the spaced distance, from the front surface of the frame toward the rear surface of the glass plate at a second outer circumferential edge part of the front surface of the frame, and the projection includes a second arcuate surface.