Reduced temperature sensitive polymeric optical article and method of making same
View Patent ↗An optical nanocomposite material has a nanoparticulate filler dispersed in a host plastic material. According to the method of making the nanocomposite material, a predetermined temperature sensitive optical vector, such as refractive index, of the plastic host material and nanoparticulate filler are directionally opposed resulting in a nanocomposite material having significantly improved stability of the refractive index with respect to temperature.
1. An optical plastic lens having reduced temperature sensitivity comprising:
a plastic host material having a temperature sensitive optical vector x 1 ; and
a nanoparticulate material dispersed in said plastic host material having a temperature sensitive optical vector x 2 corresponding to said temperature sensitive optical vector x 1 ;
wherein said temperature sensitive optical vectors x 1 and x 2 are defined by a change in refractive index of said plastic host material and said nanoparticle material, respectively, with respect to temperature change of said optical plastic lens and said temperature sensitive optical vector x 1 is directionally opposed to said temperature sensitive optical vector x 2 , to thereby reduce temperature sensitivity of said optical plastic lens in order to reduce a range of change of focal length of said optical plastic lens produced by a temperature change of said optical plastic lens and wherein said nanoparticle material is dispersed in said plastic host material such that there are no agglomerates and/or viods larger than 40 nm.
2. The optical plastic lens recited in claim 1 wherein said temperature sensitive optical vector x 1 has a negative direction and a magnitude greater than about 100×10 −6 /degree C.; and, wherein said temperature sensitive optical vector x 2 has a positive direction and a magnitude greater than about 6×10 −6 /degree C.
3. The optical plastic lens recited in claim 1 wherein said nanoparticle material has a particulate size range that is less than 40 nm.
4. The optical plastic lens recited in claim 3 wherein said nanoparticulate material has a particulate size range that is less than 20 nm.