Patent ID: 8608326

Claim:
A mirror reflector sub-assembly suitable for use in an exterior rearview mirror assembly of a vehicle, said mirror reflector sub-assembly comprising: a mirror reflective element; said mirror reflective element comprising a glass substrate having a first surface and a second surface; wherein said mirror reflective element has a principal reflector portion and an auxiliary reflector portion; wherein said principal reflector portion of said mirror reflective element has a first radius of curvature; wherein said auxiliary reflector portion of said mirror reflective element comprises a spherically curved recess established at said second surface of said glass substrate by at least one of grinding and ablating; wherein said curved recess of said auxiliary reflector portion of said mirror reflective element has a second radius of curvature; wherein said second radius of curvature is smaller than said first radius of curvature; wherein said curved recess has a cross-dimension size that is less than about 80 millimeters; wherein said second radius of curvature of said curved recess comprises a radius of curvature that is less than about 1,000 millimeters; wherein said curved recess has a maximum recess depth that is less than about 2.26 millimeters; a reflector established at said curved recess; a principal mirror reflector established at said principal reflector portion; wherein said mirror reflective element is supported at a side of a mirror back plate and wherein an opposing side of said mirror back plate is adapted for attaching said mirror back plate to a mirror actuator; wherein a heater pad is disposed at said second surface of said glass substrate between said mirror reflective element and said mirror back plate; and wherein said mirror reflective element comprises a fixed reflectance non-electro-optic mirror reflective element and wherein said principal mirror reflector is established at said second surface of said glass substrate.