Spectacle lens

Patent metadata

Field	Value
Publication number	US-2017075144-A1
Application number	US-201415038829-A
Country	US
Kind code	A1
Filing date	Nov 26, 2014
Priority date	Nov 26, 2013
Publication date	Mar 16, 2017
Grant date	—

Abstract

An aspect of the present invention relates to a spectacle lens including a multilayer film of a vapor deposition film (excluding a metal film and a metal alloy film) directly or indirectly at least on one surface of a lens substrate. The multilayer film includes at least one high refractive index layer and at least one low refractive index layer, the total optical film thickness of the high refractive index layer is λ/4 or more at a wavelength λ=780 nm, and a reflection spectrum measured in a wavelength range of 380 to 2000 nm on a surface having the multilayer film has a maximum reflectance in a wavelength range of 800 to 1350 nm.

First claim

1 . A spectacle lens comprising a multilayer film of a vapor deposition film (excluding a metal film and a metal alloy film) directly or indirectly at least on one surface of a lens substrate, wherein
the multilayer film includes at least one high refractive index layer and at least one low refractive index layer, the total optical film thickness of the high refractive index layer is λ/4 or more at a wavelength λ=780 nm, and a reflection spectrum measured in a wavelength range of 380 to 2000 nm on a surface having the multilayer film has a maximum reflectance in a wavelength range of 800 to 1350 nm.

2 . The spectacle lens according to claim 1 , wherein the total layer number of the high refractive index layer and the low refractive index layer is nine or less.

3 . The spectacle lens according to claim 1 , wherein the lens substrate is a plastic lens substrate.

4 . The spectacle lens according to claim 1 , wherein the reduction ratio in solar infrared spectrum is 25% or more.

5 . The spectacle lens according to claim 1 , wherein the reflectance on the surface having the multilayer film is 30% or less at a wavelength 1800 nm.

6 . The spectacle lens according to claim 1 , wherein the mean reflectance on the surface having the multilayer film is less than 10% in a wavelength range of 600 to 780 nm.

7 . The spectacle lens according to claim 1 , wherein the mean transmittance in a wavelength range of 600 to 780 nm is 75% or more.

8 . The spectacle lens according to claim 1 , wherein the luminous transmittance is 80% or more.

9 . The spectacle lens according to claim 1 , having a main wavelength in a wavelength range of 400 to 500 nm.

10 . The spectacle lens according to claim 1 , comprising the multilayer film directly or indirectly on both surfaces of the lens substrate.

11 . The spectacle lens according to claim 1 , wherein the high refractive index layer is a vapor deposition film made of a high refractive index material having a refractive index of 2.0 or more and less than 2.4 at a wavelength 780 nm.

12 . The spectacle lens according to claim 1 , wherein the low refractive index layer is a vapor deposition film made of a low refractive index material having a refractive index of 1.2 or more and 1.8 or less at a wavelength 780 nm.

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Matsui Yoshitaka
• Ogo Yoichi
• HARADA Koushi

Classifications

• G02B5/282

  reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection · CPC title

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title

• G02C7/107 Primary

  Interference colour filters · CPC title

• G02C7/104

  having spectral characteristics for purposes other than sun-protection · CPC title

• G02C2202/16

  Laminated or compound lenses · CPC title