Eyeglass lens

Patent metadata

Field	Value
Publication number	US-9927557-B2
Application number	US-201314430974-A
Country	US
Kind code	B2
Filing date	Sep 30, 2013
Priority date	Sep 28, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

An aspect of the present invention relates to an eyeglass lens comprising a lens substrate and a vapor-deposited film either directly or indirectly on the lens substrate, wherein the vapor-deposited film is an oxide film of metal selected from the group consisting of zirconium and tantalum, with a proportion accounted for by regions observed in a streaky shape, in a columnar shape, or in a lump shape in a cross-sectional image of the vapor-deposited film obtained by a transmission electron microscope of equal to or less than 20%.

First claim

The invention claimed is:

1. An eyeglass lens comprising a lens substrate and a vapor-deposited film either directly or indirectly on the lens substrate, wherein
the vapor-deposited film is an oxide film of zirconium, with a proportion accounted for by columnar structure or crystalline grains observed in a cross-sectional image of the vapor-deposited film obtained by a transmission electron microscope of from 2% to 20% based on the entire area of the observed field, which is set to 100 nm square (100 nm × 100 nm) to 150 nm square (150 nm × 150 nm) at a magnification of 100,000 to 200,000-fold, or 50 nm square (50 nm × 50 nm) to 100 nm square (100 nm × 100 nm) at a magnification of exceeding 200,000-fold;
an average grain size of the vapor-deposited film observed in a planar image obtained by a transmission electron microscope ranges from 5 nm to 20 nm; and
a film stress of the vapor-deposited film ranges from −200 MPa to 50 MPa.

2. The eyeglass lens according to claim 1 , wherein the columnar structure or crystalline grains comprise an amorphous material.

3. The eyeglass lens according to claim 1 , wherein the proportion accounted for by the columnar structure or crystalline grains is equal to or less than 15% based on the entire area of the observed field.

4. The eyeglass lens according to claim 1 , wherein the proportion accounted for by the columnar structure or crystalline grains is equal to or less than 10% based on the entire area of the observed field.

5. The eyeglass lens according to claim 1 , wherein a proportion accounted for by grain boundaries, which are boundaries separating grains from regions outside of the grains, in a planar image obtained by a transmission electron microscope is less than 10% based on the entire area of the observed field.

6. The eyeglass lens according to claim 1 , which comprises the vapor-deposited film as at least one layer in a multilayer vapor-deposited film.

7. The eyeglass lens according to claim 1 , wherein the proportion accounted for by the columnar structure or crystalline grains is from 2% to 15% based on the entire area of the observed field.

8. The eyeglass lens according to claim 1 , wherein the proportion accounted for by the columnar structure or crystalline grains is from 2% to 10% based on the entire area of the observed field.

9. The eyeglass lens according to claim 1 , wherein a proportion accounted for by grain boundaries, which are boundaries separating grains from regions outside of the grains, in a planar image obtained by a transmission electron microscope is from 1% to 5% based on the entire area of the observed field.

10. The eyeglass lens according to claim 1 , wherein an average grain size of the vapor-deposited film observed in a planar image obtained by a transmission electron microscope ranges from 5.8 nm to 11.5 nm.

Assignees

• Hoya Corp

Inventors

• Tadokoro Nobuyuki
• Ogawa Naomi
• Adachi Makoto
• Komine Yuko
• HARADA Koushi

Classifications

• G02B1/14 Primary

  Protective coatings, e.g. hard coatings · CPC title

• G02B1/10

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• C23C14/24

  Vacuum evaporation · CPC title

• G02C7/02 Primary

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

• B32B9/00

  Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00 · CPC title