US Patent 10112538 Rearview mirror assembly for vehicle

An interior rearview mirror assembly for a vehicle includes a mirror casing and a mirror reflective element disposed at an outer end region of a sidewall of the mirror casing. The mirror reflective element includes a first glass substrate having a front surface and a rear surface and a substrate thickness spanning between the front and rear surfaces. The first glass substrate includes a flat region and a rounded perimeter edge circumscribing the flat region. Curvature of a rounded outside surface of the outer end region of the sidewall matches curvature of the rounded perimeter edge of the first glass substrate whereby the rounded outside surface of the outer end region of the sidewall and the rounded perimeter edge of the first glass substrate combine to provide a curved transition between the front surface of the flat region and a principal outside surface of the sidewall of the mirror casing.