Optical element, method for producing the same, and display apparatus

Patent metadata

Field	Value
Publication number	US-9535191-B2
Application number	US-82289510-A
Country	US
Kind code	B2
Filing date	Jun 24, 2010
Priority date	Jul 3, 2009
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

An optical element having an anti-reflection function includes a base having a main surface, and a plurality of projecting or recessed structures arranged on the main surface of the base at a fine pitch equal to or less than the wavelength of visible light, wherein the main surface of the base, the main surface having the structures thereon, has hydrophilicity, and a contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 30° or less.

First claim

The invention is claimed as follows:

1. An optical element having an anti-reflection function, comprising:
a base having a main surface; and
a plurality of projecting or recessed structures arranged on the main surface of the base at a fine pitch equal to or less than the wavelength of visible light,
wherein the main surface of the base, the main surface having the structures thereon, has hydrophilicity,
a contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 30° or less, and
a contact angle of the main surface of the base, the main surface having the structures thereon, to oleic acid is 30° or less.

2. The optical element according to claim 1 ,
wherein the contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 10.6° or more and 30° or less.

3. The optical element according to claim 1 ,
the contact angle of the main surface of the base, the main surface having the structures thereon, to oleic acid is 5° or more and 30° or less.

4. The optical element according to claim 1 ,
the contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 10.6° or more and 30° or less, and
the contact angle of the main surface of the base, the main surface having the structures thereon, to oleic acid is 5° or more and 30° or less.

5. The optical element according to claim 1 ,
wherein the structures each have an elliptical cone shape or a truncated elliptical cone shape, the major axis direction of which is a direction in which the tracks extend.

6. The optical element according to claim 1 ,
wherein the structures are arranged so as to form a plurality of rows of tracks on the main surface of the base and form a hexagonal lattice pattern, a quasi-hexagonal lattice pattern, a tetragonal lattice pattern, or a quasi-tetragonal lattice pattern.

7. The optical element according to claim 1 , wherein a filling factor of the structures to the main surface of the base is 65% or more.

8. The optical element according to claim 6 ,
wherein the structures are arranged so as to form a plurality of rows of linear tracks and form a quasi-hexagonal lattice pattern, and
an average difference between a maximum height and a minimum depth between adjacent structures in the direction in which the tracks extend is smaller than an average difference between a maximum height and a minimum depth between adjacent structures in a row direction of the tracks.

9. The optical element according to claim 6 ,
wherein the structures are arranged so as to form a plurality of rows of linear tracks and form a tetragonal lattice pattern or a quasi-tetragonal lattice pattern, and
an average difference between a maximum height and a minimum depth between adjacent structures in an arrangement direction that is slanted with respect to the direction in which the tracks extend is smaller than an average difference between a maximum height and a minimum depth between adjacent structures in the direction in which the tracks extend.

10. The optical element according to claim 6 , wherein an arrangement pitch P 1 of the structures in the same track is longer than an arrangement pitch P 2 of the structures between two adjacent tracks.

11. The optical element according to claim 6 ,
wherein the structures form a hexagonal lattice pattern or a quasi-hexagonal lattice pattern on the main surface of the base, and
when an arrangement pitch of the structures in the same track is represented by P 1 and an arrangement pitch of the structures between two adjacent tracks is represented by P 2 , the ratio P 1 /P 2 satisfies the relationship 1.00≦P 1 /P 2 ≦1.1 or 1.00<P 1 /P 2 ≦1.1.

12. The optical element according to claim 6 ,
wherein the structures form a tetragonal lattice pattern or a quasi-tetragonal lattice pattern on the main surface of the base, and
when an arrangement pitch of the structures in the same track is represented by P 1 and an arrangement pitch of the structures between two adjacent tracks is represented by P 2 , the ratio P 1 /P 2 satisfies the relationship 1.4<P 1 /P 2 ≦1.5.

13. A display apparatus comprising:
an optical element having an anti-reflection function, comprising:
a base having a main surface; and
a plurality of projecting or recessed structures arranged on the main surface of the base at a fine pitch equal to or less than the wavelength of visible light,
wherein the main surface of the base, the main surface having the structures thereon, has hydrophilicity,
a contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 30° or less, and
a contact angle of the main surface of the base, the main surface having the structures thereon, to oleic acid is 30° or less.

14. A method for producing an optical element having an anti-reflection function, the method comprising:
forming a plurality of projecting or recessed structures arranged on a main surface of a base at a fine pitch equal to or less than the wavelength of visible light by transferring recesses and projections formed on a surface of a master to a transfer material; and
wherein the main surface of the base, the main surface having the structures thereon, has hydrophilicity,
a contact angle of the main surface of the base, the main surface having the structures thereon, to pure water is 30° or less, and
a contact angle of the main surface of the base, the main surface having the structures thereon, to oleic acid is 30° or less.

Assignees

• Tazawa Hiroshi
• Sony Corp

Inventors

• Tazawa Hiroshi

Classifications

• G02B1/118 Primary

  having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures · CPC title