Optical product, and spectacle lens and spectacles
It is an object to provide an optical product and the like which have antireflective performance, require less number of types of materials for film formation, have a simple film structure which makes film formation easy and reduces costs, and have sufficient heat resistance. In the optical product, an optical multilayer film having a five-layer structure in which SiO 2 and ZrO 2 are alternately layered is provided on one or both of surfaces of a base. With a layer closest to the base being a first layer, a quotient obtained by dividing a physical thickness of a fourth layer that is ZrO 2 by a physical thickness of a second layer that is ZrO 2 is greater than or equal to 1 and not greater than 4.
1. An optical product comprising:
a base; and
an optical multilayer film, which prevents reflection in a visible region, formed on both surfaces of the base, wherein the optical multilayer film comprises a five-layer structure in which SiO 2 and ZrO 2 are alternately layered;
wherein a layer of the multilayer film closest to the base is a first layer; and
wherein a quotient obtained by dividing a physical thickness of a fourth layer, that is ZrO 2 , by a physical thickness of a second layer, that is ZrO 2 , is in a range of 1 or more to 1.5 or less.
2. A spectacle lens comprising the optical product according to claim 1 .
3. Spectacles comprising the spectacle lens according to claim 2 .