Bonded Rearview Mirror Structure for Impact Resistance
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Solution Overview
Problem
Conventional rearview mirrors suffer from glass shattering due to poor toughness when impacted, as the reflective mirror is suspended and deforms during a CCC head impact test.
Innovation Solution
The impact-resistant rearview mirror design bonds the reflective mirror to the display screen of the display module, with a heat dissipation plate fixedly connected to a support plate, forming a rigid loop that supports the reflective mirror and dissipates impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reflective mirror is mounted with a gap between the display screen, then the assembly structure is simple and easy to manufacture, but the glass deforms and shatters under impact due to poor toughness
Solution Approach 1:
The patent merges the reflective mirror and display screen into a unified bonded structure, eliminating the gap between them. The adhesive layer creates a combined assembly that distributes impact forces across both components, preventing the mirror glass from deforming and shattering while maintaining manufacturing feasibility through standardized bonding processes
Solution Approach 2:
The patent employs a composite structure combining glass (reflective mirror), polymer adhesive (bonding layer), and display screen materials. This composite assembly leverages the strengths of each material - the glass provides optical functionality, the adhesive provides flexibility and stress distribution, and the display screen provides structural support - achieving improved impact resistance while maintaining ease of manufacture
2Device complexity
If the reflective mirror is in a suspended state within the housing, then the housing structure is simple, but the glass exceeds its yield strength during deformation and breaks
Solution Approach 1:
The patent combines the reflective mirror with the display screen through adhesive bonding, creating a unified structure that eliminates the suspended state. This merged assembly is then mounted as a single unit to the housing, reducing housing complexity while ensuring the mirror glass cannot deform independently beyond its yield strength
Solution Approach 2:
The adhesive layer acts as an intermediary between the reflective mirror and display screen, providing mechanical bonding while allowing for thermal expansion and stress relief. This intermediary layer prevents direct stress transmission that would cause the glass to exceed its yield strength, thereby improving reliability without complicating the housing structure
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 prevents the reflective mirror glass from deforming and breaking upon impact by transmitting forces through the display module and support structure, enhancing the mirror's impact resistance.
Implementation Method 1
an inner side surface of the reflective mirror and an outer surface of the display screen are pasted together
Implementation Method 2
an external force may be transmitted from the display module to the base through force conduction when the force impacts the reflective mirror
Data Source
AI summary
An impact-resistant rearview mirror includes a housing, a display module, a reflective mirror, and a mounting bracket, where the housing includes a front housing and a rear housing that are mutually matched, a rear side of the display module is a heat dissipation plate, a front side is a display screen, the mounting bracket includes a base and a support plate that is supportingly connected to the base, the display module and the support plate are installed in the housing, the heat dissipation plate is fixedly connected to the support plate and causes the support plate to support the heat dissipation plate, the reflective mirror is installed on the front housing and located on a front side of the display screen, and an inner side surface of the reflective mirror and an outer surface of the display screen are pasted together via an adhesive layer.