OPTICAL PLASTIC PRODUCT, AND PLASTIC SPECTACLE LENS AND SPECTACLES

• US 20200132886A1
• Filed: 12/23/2019
• Published: 04/30/2020
• Est. Priority Date: 07/03/2017
• Status: Active Grant

• Current Assignee: Tokai Optical Co., Ltd.
• Original Assignee: Tokai Optical Co., Ltd.
• Inventors: TAKAHASHI, Hirotoshi
• Granted Patent: US 11,709,292 B2
• Time in Patent Office: Days
• CPC Class Codes: B29D 11/00009 Production of simple or compound lenses
• CPC Class Codes: B29D 11/00355 with a refractive index gradient
• CPC Class Codes: B29D 11/00548 with surfaces formed by films
• CPC Class Codes: B29D 11/00788 Producing optical films
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• 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 7/107 Interference colour filters

Abstract

An optical plastic product has an optical multilayer film formed on one or both surfaces of a base made of plastic, directly or via an intermediate film, wherein the optical multilayer film includes a tensile-stress high-refractive-index layer having tensile stress as internal stress and made of a high refractive index material, and a low refractive index layer made of a low refractive index material, and the tensile-stress high-refractive-index layer is disposed with a physical film thickness of not greater than 10 nm, in a first layer as counted from the base side in the optical multilayer film.

Claims

1. An optical plastic product having an optical multilayer film disposed on one or both surfaces of a base made of plastic, directly or via an intermediate film, wherein

the optical multilayer film includes a tensile-stress high-refractive-index layer having tensile stress as internal stress and made of a high refractive index material, and a low refractive index layer made of a low refractive index material, and

the tensile-stress high-refractive-index layer is disposed with a physical film thickness of not greater than 10 nm, in a first layer as counted from the base side in the optical multilayer film.

2. The optical plastic product according to claim 1, wherein

in the optical multilayer film, a high refractive index layer made of a high refractive index material and the low refractive index layer are disposed alternately.

3. The optical plastic product according to claim 1, wherein

the tensile-stress high-refractive-index layer is a ZrO₂ layer.

4. The optical plastic product according to claim 1, wherein

a total physical film thickness of the optical multilayer film is not less than 200 nm.

5. The optical plastic product according to claim 1, wherein

the intermediate film is a hard coating film.

6. A plastic spectacle lens using the optical plastic product according to claim 1.

7. Spectacles using the plastic spectacle lens according to claim 6.