Eyeglass lens

Patent metadata

Field	Value
Publication number	US-12013598-B2
Application number	US-201917255412-A
Country	US
Kind code	B2
Filing date	Jun 27, 2019
Priority date	Jun 29, 2018
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

Provided is an eyeglass lens 1 configured to cause rays that have entered from an object-side surface 3 to be emitted from an eyeball-side surface 4 and cause the emitted rays to converge at a predetermined position A. The eyeglass lens 1 includes a lens base material 2 having a plurality of base material convex portions 6 on at least one of the object-side surface 3 and the eyeball-side surface 4 , and a coating film covering the surface provided with the base material convex portions 6 , in which convex portions present on the outermost surface of the eyeglass lens 1 located on a side on which the base material convex portions 6 are provided and the base material convex portions 6 have common light ray convergence properties.

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; and
a coating film covering the at least one of the object-side surface and the eyeball-side surface that includes the plurality of base material convex portions,
wherein
the base material convex portion is configured to cause rays from a point source at infinity that entered the eyeglass lens to converge at a corresponding one of a plurality of positions B that is closer to the object than the predetermined position A is,
the coating film has a hard coating film and an antireflection film, and
the coating film has a thickness of 3.0 μm or less, and
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 a plurality of positions B that is closer to the object than the predetermined position A is.

2. The eyeglass lens according to claim 1 ,
wherein, for each of the plurality of coating film convex portions:
a maximum absolute value in a lens thickness direction between a shape of the coating film convex portion and a shape of the base material convex portions is 0.1 μm or less.

3. The eyeglass lens according to claim 1 ,
wherein each of the plurality of positions B 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.

4. The eyeglass lens according to claim 1 ,
wherein, out of a large 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 the vicinity of the predetermined position A nor the vicinity of any of the plurality of positions B is less than or equal to 30% of the large number of rays.

5. The eyeglass lens according to claim 1 ,
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).

6. 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 of a profile curve of cylinder power at a base of the coating film convex portion in a distribution of cylinder power for the outermost surface shape of the coating film is 0.20 mm or less.

7. 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, the hard coating film formed on the λ/4 film, and the antireflection film formed on the hard coating film.

8. The eyeglass lens according to claim 7 ,
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
• Qi Hua
• Ishizaki Takako
• Kono Shigetoshi

Inventors

• Qi Hua
• Ishizaki Takako
• Kono Shigetoshi

Classifications

• G02C7/027

  considering wearer's parameters · CPC title

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B1/14

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

• G02C7/10 Primary

  Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses · CPC title

• G02C2202/24

  Myopia progression prevention · CPC title