Multilayer Antireflection Layer, Method for Producing the Same, and Plastic Lens
A multilayer antireflection layer includes a high refractive index layer and a low refractive index layer that are laminated alternately, the high reflective index layer having a grain boundary, and particles forming the grain boundary having an average particle diameter of 30 nm or less.
1 . A multilayer antireflection layer comprising a high refractive index layer and a low refractive index layer that are laminated alternately,
the high reflective index layer having a grain boundary, and
particles forming the grain boundary having an average particle diameter of 30 nm or less.
2 . The layer according to claim 1 , wherein the average particle diameter of the particles forming the grain boundary is from 14 to 30 nm.
3 . The layer according to claim 1 , wherein the high refractive index layer contains at least one of zirconium oxide, tantalum oxide and niobium oxide.
4 . The layer according to claim 1 , wherein the low refractive index layer contains silicon oxide.
5 . A plastic lens comprising a plastic lens substrate having formed thereon the multilayer antireflection layer according to claim 1 .
6 . A method for producing the multilayer antireflection layer according to claim 1 , the method comprising:
forming the high refractive index layer by a dry film forming method.
7 . The method according to claim 6 , wherein the dry film forming method is an ion assisted vapor deposition method.