| 摘要 |
PROBLEM TO BE SOLVED: To restrain the deformation of a synthetic resin lens substrate having an antireflection film and widen a low reflection wavelength range. SOLUTION: This lens has a QHQ type antireflection film with an intermediate refraction factor layer, a high refraction factor layer and a low refraction factor layer respectively stacked in order on a lens substrate made of synthetic resin. In this case, the high refraction factor layer is formed to have the refraction factor changed in a thicknesswise direction, so that the factor at wavelength as the center of the design becomes lower by a value between 0.01 and 0.20 on surface side than on the lens substrate side. |
