Eyeglass lens

Patent metadata

Field	Value
Publication number	US-11947191-B2
Application number	US-201917255400-A
Country	US
Kind code	B2
Filing date	Jun 27, 2019
Priority date	Jun 29, 2018
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

Provided is an eyeglass lens configured to cause rays that have entered from an object-side surface to be emitted from an eyeball-side surface and cause the emitted rays to converge at a predetermined position A. The eyeglass lens includes a lens base material having a plurality of base material convex portions on at least one of the object-side surface and the eyeball-side surface, and the eyeglass lens has a configuration for suppressing stray light rays that do not pass through the vicinity of the predetermined position A or the vicinity of the position B that is closer to the object than the predetermined position A is.

First claim

The invention claimed is:

1. An eyeglass lens configured to cause rays from a point source at infinity that enter the eyeglass lens at an object side of the eyeglass lens to exit the eyeglass lens from an eyeball side of the eyeglass lens and converge at a predetermined position A, the eyeglass lens comprising:
a lens base material having an object-side surface and an eyeball-side surface, at least one of the object-side surface and the eyeball-side surface including a plurality of base material convex portions,
wherein the eyeglass lens has a configuration for reducing, from among light rays from a point source at infinity that enter the eyeglass lens at an object side of the eyeglass lens to exit the eyeglass lens from an eyeball side of the eyeglass lens, a proportion of the light rays that pass through neither inside of the radius of 0.1 mm of the predetermined position A nor inside of the radius of 0.1 mm of any of a plurality B of positions that are closer to the object than the predetermined position A is;
a coating film covering the at least one of the object-side surface and the eyeball-side surface including the plurality of base material convex portions,
wherein the coating film includes a plurality of coating film convex portions, and
wherein, for each of the plurality of coating film convex portions:
a shape of an outermost surface of the coating film convex portion originates from a shape of an outermost surface of a corresponding one of the plurality of base material convex portions, and
the coating film convex portion is configured to cause rays from a point source at infinity that have entered the eyeglass lens to converge at a corresponding one of the plurality B of positions that is closer to the object than the predetermined position A is, and

wherein, out of a number of rays from a point source at infinity that evenly enter a predetermined range of the object side of the eyeglass lens and pass through the coating film, the proportion that pass through neither inside of the radius of 0.1 mm of the predetermined position A nor inside of the radius of 0.1 mm of any of the plurality B of positions is less than or equal to 30% of the number of rays;
wherein, for at least one of the plurality of coating film convex portions, a relationship between a protruding length L c of the coating film convex portion and a protruding length L l of the corresponding base material convex portion satisfies Formula (1) below,
0.6≤ L c /L l ≤1.5  Formula (1).

2. The eyeglass lens according to claim 1 ,
wherein each of the plurality B of positions is closer to the object than the predetermined position A is by an amount in a range of more than 0 mm and 10 mm or less.

3. The eyeglass lens according to claim 1 ,
wherein, for at least one of the plurality of coating film convex portions, the full width at half maximum at a base of the coating film convex portion is 0.20 mm or less in a profile curve of a distribution of cylinder power of the outermost surface shape of the coating film.

4. The eyeglass lens according to claim 1 ,
wherein the coating film includes a λ/4 film that is in contact with the lens base material, a hard coating film formed on the λ/4 film, and an antireflection film formed on the hard coating film.

5. The eyeglass lens according to claim 4 ,
wherein a refractive index of the lens base material is higher than that of the λ/4 film, and a refractive index of the λ/4 film is higher than that of the hard coating film.

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Qi Hua
• Ishizaki Takako
• Kono Shigetoshi

Classifications

• G02C7/022 Primary

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B1/14

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

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/02 Primary

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