Optical product and spectacle lens

• US 10,101,502 B2
• Filed: 01/13/2016
• Issued: 10/16/2018
• Est. Priority Date: 08/28/2013
• Status: Active Grant

• Current Assignee: Tokai Optical Co., Ltd.
• Original Assignee: Tokai Optical Co., Ltd.
• Inventors: Takahashi, Hirotoshi
• Primary Examiner(s): Collins, Darryl J
• Application Number:
  US14/994,490
• Publication Number:
  US 20160124118A1
• Time in Patent Office: 1,007 Days
• Field of Search: None
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: G02B 5/282 reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
• CPC Class Codes: G02C 2202/16 Laminated or compound lenses
• CPC Class Codes: G02C 7/022 Ophthalmic lenses having special refractive features achieved by special materials or material structures G02C7/049 takes precedence
• CPC Class Codes: G02C 7/10 Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses

Abstract

An optical product (spectacle lens) according to the present invention includes a base having a convex surface and a concave surface, and an optical multilayer film formed on at least the concave surface of the base. The optical multilayer film has, in total, six layers in which a first layer is closest to the base, and a layer formed of zirconium dioxide and a layer formed of silicon dioxide are alternately layered such that the first layer is the layer formed of zirconium dioxide. A physical film thickness of a fourth layer formed of silicon dioxide is greater than or equal to 10 nm and not greater than 22 nm. A sum of physical film thicknesses of the first layer formed of zirconium dioxide and a second layer formed of silicon dioxide is greater than or equal to 35 nm and not greater than 45 nm.

Claims

1. An optical product comprising:

a base having a convex surface and a concave surface; and

an optical multilayer film formed on at least the concave surface of the base;

wherein the optical multilayer film has, in total, six layers in which a first layer is closest to the base, and a layer formed of zirconium dioxide and a layer formed of silicon dioxide are alternately layered such that the first layer is the layer formed of zirconium dioxide;

wherein a physical film thickness of a fourth layer, which is the layer formed of silicon dioxide, is greater than or equal to 10 nm and not greater than 22 nm; and

wherein a sum of physical film thicknesses of the first layer, which is the layer formed of zirconium dioxide, and a second layer, which is the layer formed of silicon dioxide, is greater than or equal to 35 nm and not greater than 45 nm; and

wherein a sum of physical film thicknesses of the first layer to the fourth layer is greater than or equal to 100 nm and not greater than 110 nm;

whereby an average reflectance of light in the visible range and in the ultraviolet range is reduced, so that the average reflectance of light in the ultraviolet range having wavelengths that are greater than or equal to 280 nm and less than 400 nm is less than or equal to 3.5% at the concave surface, and the average reflectance of light in the visible region having wavelengths of greater than 400 nm and 720 nm or less is less than or equal to 2.5%.

2. The optical product according to claim 1, wherein the average reflectance of light in the ultraviolet range having wavelengths that are greater than or equal to 300 nm and less than 400 nm is less than or equal to 2.5% at the concave surface.

3. A spectacle lens comprising the optical product according to claim 1, wherein the base is a spectacle lens base.