Eyeglass frame having Ti-Ni-V alloy element with improved wear c

Details Eyeglass frame having Ti-Ni-V alloy element with improved wear c Eyeglass frame having Ti-Ni-V alloy element with improved wear c

1989-04-20

1991-01-08

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

351111, 351124, G02C 514, G02C 502

Patent

active

049830295

ABSTRACT:
In an eyeglass frame comprising a pair of lens fixing rims, a bridge connecting the paired rims, and a pair of temples, the bridge and/or the temples are made of Ti-Ni-V alloy having a super elasticity of a generally rectangular stress-strain hysteresis loop over a relevant temperature range of 0.degree.-20.degree. C. so as to improve eyeglass wearing comfortability. The Ti-Ni-V alloy comprises Ni and Ti with an atomic ratio Ni/Ti of 1.02-1.06 and V 0.25-2.0 at. %, and is worked into a desired shape and thereafter is heat-treated at 425.degree.-525.degree. C. for 10-60 minutes.

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