Method for producing polarizing lens, polarizing film and polarizing lens

Patent metadata

Field	Value
Publication number	US-12384124-B2
Application number	US-202117393768-A
Country	US
Kind code	B2
Filing date	Aug 4, 2021
Priority date	Jun 28, 2019
Publication date	Aug 12, 2025
Grant date	Aug 12, 2025

Abstract

A method for producing a polarizing lens having a high luminous transmittance and degree of polarization with astigmatism kept low, and a polarizing film and a polarizing lens. The method for producing a polarizing lens includes: contracting a polarizing film at a maximum rate of contraction of 14% or more and 30% or less under moist conditions; processing the polarizing film into a curve; drying the polarizing film; providing a mold having a cavity in which the polarizing film is placed in the inside; injecting a curable composition into the cavity; curing the curable composition to obtain a polarizing lens in which the polarizing film is placed in the inside; and annealing the polarizing lens.

First claim

The invention claimed is:

1. A method for producing a polarizing lens, comprising:
contracting a polarizing film at a maximum rate of contraction of 14% or more and 30% or less under moist conditions;
processing the polarizing film into a curve;
drying the polarizing film;
providing a mold having a cavity in which the polarizing film is placed in the inside;
injecting a curable composition into the cavity;
curing the curable composition to obtain a polarizing lens in which the polarizing film is placed in the inside; and
annealing the polarizing lens,
wherein the polarizing lens has a luminous transmittance of 30% or more.

2. The method for producing a polarizing lens according to claim 1 , wherein
temperature T 1 of the drying is 100° C. or higher and 140° C. or lower.

3. The method for producing a polarizing lens according to claim 1 , wherein
temperature T 2 of the annealing is 100° C. or higher and 130° C. or lower.

4. The method for producing a polarizing lens according to claim 1 , wherein
the polarizing lens has a glass transition temperature of 80° C. or higher and 150° C. or lower.

5. The method for producing a polarizing lens according to claim 1 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

6. The method for producing a polarizing lens according to claim 5 , wherein
a minimum value of a distance between the side of the cavity of the upper mold and the polarizing film is 0.05 mm or larger and 2.0 mm or smaller.

7. The method for producing a polarizing lens according to claim 6 , wherein
the polarizing lens has a negative power.

8. The method for producing a polarizing lens according to claim 2 , wherein
temperature T 2 of the annealing is 100° C. or higher and 130° C. or lower.

9. The method for producing a polarizing lens according to claim 2 , wherein
the polarizing lens has a glass transition temperature of 80° C. or higher and 150° C. or lower.

10. The method for producing a polarizing lens according to claim 3 , wherein
the polarizing lens has a glass transition temperature of 80° C. or higher and 150° C. or lower.

11. The method for producing a polarizing lens according to claim 8 , wherein
the polarizing lens has a glass transition temperature of 80° C. or higher and 150° C. or lower.

12. The method for producing a polarizing lens according to claim 2 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

13. The method for producing a polarizing lens according to claim 3 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

14. The method for producing a polarizing lens according to claim 4 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

15. The method for producing a polarizing lens according to claim 8 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

16. The method for producing a polarizing lens according to claim 9 , wherein
the preparation of the mold comprises placing an upper mold, the polarizing film after the drying, and a lower mold at respective intervals in the presented order, and closing the intervals between the upper mold and the lower mold with a sealing member.

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Takada Keisuke
• MATSUE Aoi
• Yamashita Teruo
• Watanabe Tsuyoshi

Classifications

• G02C2202/16

  Laminated or compound lenses · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02C7/12

  Polarisers · CPC title

• B29D11/00432

  Auxiliary operations, e.g. machines for filling the moulds (B29D11/00125 takes precedence) · CPC title

• B29C2071/022

  Annealing · CPC title