Plastic lens
AssigneeNippon Sheet Glass Co., Ltd.
InventorsShoji Mase, Noboru Otani, Motoaki Yoshida, Satoshi Ishizuka, Hisayuki Kayanoki, Naoto Hirayama
Life of this patent
Estimating the term…
Abstract
A plastic lens formed by laminating, in the order as described below, (A) a plastic lens substrate having a refractive index in the range of 1.50 to 1.70, (B) a primer layer containing a metal compound of at least one metal selected from the group consisting of Al, Ti, Zr, Sn and Sb and a polyurethane, or (B') a primer layer formed from a polyurethane containing at least one element selected from the group consisting of Cl, Br, I and S, (C) a hard coating layer, and (D) a single-layered or multi-layered anti-reflection layer formed by vapor-depositing an inorganic substance.
Claims11
A plastic lens formed by laminating, in the order described below,
- (A) a plastic lens substrate having a refractive index in the range of 1.50 to 1.70,
- (B) a primer layer containing a metal compound of at least one metal selected from the group consisting of Al, Ti, Zr, Sn and Sb and a thermosetting polyurethane obtained by reacting a blocked polyisocyanate and a polyol, and having a refractive index in the range of 1.45 to 1.60 and satisfying both the following equation (1), ##EQU4## wherein:
- n.sub.s is the refractive index of the plastic lens substrate (A),
- n.sub.H is the refractive index of a coating layer (C) to be described below, and
- n.sub.p is the refractive index of the primer layer (B),
- and the following equation (2),
- D=.lambda./4n.sub.p ( 2)
- wherein:
- .lambda. is the wavelength of visible light at 450 to 650 nm,
- n.sub.p is as defined above, and
- d is the thickness (nm) of the primer layer (B),
- (C) a coating layer comprising a silicon based resin, and
- (D) a single-layered or multi-layered anti-reflection layer formed by vapor-depositing an inorganic substance.
A plastic lens formed by laminating, in the order described below,
- (A) a plastic lens substrate having a refractive index in the range of 1.50 to 1.70,
- (B') a primer layer formed from a polyurethane containing at least one element selected from the group consisting of Cl, Br, I and S, having a refractive index in the range of 1.45 to 1.60 and satisfying both the following equation (1), ##EQU5## wherein:
- n.sub.s is the refractive index of the plastic lens substrate (A),
- n.sub.H is the refractive index of a coating layer (C) to be described later, and
- n.sub.p is the refractive index of the primer layer (B'),
- and the following equation (2),
- d=.lambda./4n.sub.p ( 2)
- wherein:
- .lambda. is the wavelength of visible light at 450 to 650 nm,
- n.sub.p is as defined above, and
- d is the thickness (nm) of the primer layer (B'),
- (C) a coating layer comprising a silicon based resin, and
- (D) a single-layered or multi-layered anti-reflection layer formed by vapor-depositing an inorganic substance.
Dependencies are inferred from the claim text.