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Safety Protected Electrochromic Rearview Mirrors
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English
Abstract
Should a rearview mirror shatter under impact in an accident, it is important that occupants are not injured by glass fragments that scatter about the vehicle, and that occupants are not injured should they contact shattered glass retained in the mirror assembly. For decades, the safety of prismatic interior mirrors, and of flat and convex exterior mirrors, has been assured by use of antiscattering backings such as tapes or elastomeric layers which are firmly bonded to the rearmost surface of a single mirror glass element. Such backing materials are designed to prevent fragments detaching from the mirror should the glass shatter, and to securely retain shattered glass such that shards do not slide or otherwise displace so as to create a sharp edge or protrusion likely to lead to a lacerative injury. Recently, electro-optic mirrors have been introduced for use both on the interior and exterior of automobiles. Several constructions involve an electrochromic material sandwiched between two glass elements. This paper describes use of tear-resistant, transparent polymer layers to ensure that multiglass mirror constructions have a safety performance, under impact, at least equivalent to that currently delivered by single glass element rearview mirrors in widespread use. Regulatory and industry safety standards and specifications are discussed, safety statistics from national accident records are briefly reviewed, and the impact performance of safety protected electrochromic rearview mirror assemblies is described.
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Citation
Lynam, N., "Safety Protected Electrochromic Rearview Mirrors," SAE Technical Paper 920402, 1992, https://doi.org/10.4271/920402.Also In
References
- Official Journal of the European Communities Commission Directive of February 18, 1985 adapting Council Directive 71/127/EEC
- “Motor Vehicle Safety Standard No: 111 Rearview Mirrors” National Highway Traffic Safety Administration Washington, DC
- “Glass, Laminated” U.S. Army Specification May 13 1942
- “Safety Code for Safety Glazing for Glazing Motor Vehicles Operating on Land Highways” ANSI Z26.1-1988 American National Standards Institute New York 10018
- “Safety Glazing Materials - Motor Vehicles -SAE J674 Nov 83” SAE Recommended Practice
- “Motor Vehicle Safety Standard No: 201 Occupant Protection in Interior Impact - Passenger Cars” National Highway Traffic Safety Administration Washington, DC
- “Drop Test for Evaluating Laminated Safety Glass for Use in Automotive Windshields - SAE J938 Jun 1984” SAE Recommended Practice
- National Accident System U.S. Department of Transportation National Highway Traffic Safety Administration National Center for Statistics and Analysis Washington, DC 20590
- “Review of NASS Data as it Pertains to Rearview Mirrors” Helder Dorothy Technical Report April 1991 Donnelly Corporation Holland, MI, USA
- “The Abbreviated Injury Scale - 1985 Revision” Association for the Advancement of Automotive Medicine Des Plaines, IL