Surface treatment method and optical part
A surface treating method of forming a coating layer on a base material, comprising conducting a plasma processing under an atmospheric pressure for the base material so as to form a coating layer on the base material having at least one of a curved surface and an uneven surface.
1. A surface treating method of forming a coating layer on a base material, comprising:
conducting a plasma processing under an atmospheric pressure for the base material so as to form a coating layer on the base material having at least one of a curved surface and an uneven surface, wherein the base material is a lens having an effective optical surface and the lens satisfies the following formulas:
0<D≦300
0< T/D≦ 1.0
where D is a diameter (mm) of the effective optical surface and T is a thickness (mm) of the effective optical surface on an optical axis.
2. The surface treating method of claim 1 , wherein the lens is a lens for use in an optical pickup apparatus and the lens satisfies the following formulas:
1≦D≦10
0.23 T/D≦ 0.5.
3. The surface treating method of claim 1 , wherein plural ring-shaped step portions are provided on the effective optical surface and satisfy the following formula.
0<Hi≦0.01
0.001≦Li≦0.1
where Hi is a depth (mm) of the plural ring-shaped step portions and Li is an interval (mm) of the plural ring-shaped step portions.
4. The surface treating method of claim 1 , wherein the base material is a lens array on which plural lens sections are mounted in a form of an array and satisfies the following formulas:
0<Di≦300
0< Ti/Di≦ 1.0
0<Li≦200
where Di is a diameter (mm) of a lens section, Ti is a thickness (mm) of the lens section and Li is an interval (mm) of the plural lens sections.
5. The surface treating method of claim 4 , wherein the lens array is a micro lens array and satisfies the following formulas:
0.01≦Di≦2
0.2≦ Ti/Di≦ 0.5
0.01≦Li≦5.
6. The surface treating method of claim 1 , wherein at least one of a concave or a convex is provided on the uneven surface of the base material.
7. The surface treating method of claim 6 , wherein plural convexes being shaped in one of a saw tooth and a rectangle are provided on the base material with an arrangement satisfying the following formulas:
0<Li≦30
0< Hi/Li≦ 3.0
0<Wi<Li
where Hi is a height (mm) of the convex, Wi is a width (mm) of the convex and Li is an interval (mm) of plural convexes.
8. The surface treating method of claim 7 , wherein some of the plural convexes are provided on the base material with a different interval Lk (mm) and satisfies the following formula:
0<Wi<Lk.
9. The surface treating method of claim 7 , wherein the base material is a light introducing plate satisfying the following formulas:
0.05≦Li≦2
0.01≦ Hi/Li≦ 0.1.
10. The surface treating method of claim 1 , wherein the base material is a prism satisfying the following formulas:
0<W≦30
0<HW≦3.0
where H is a height (mm) of the prism and W is a width (mm) of the prism.
11. The surface treating method of claim 10 , wherein the prism is a micro prism satisfying the following formulas:
0.5≦W≦4.0
0.5≦H≦4.0.
12. An optical element, comprising:
at least one of a curved surface and an uneven surface on a base material; and
a coating layer formed on the at least one of a curved surface and an uneven surface by the surface treating method of claim 1 .
13. The optical element of claim 12 , wherein the lens is a lens for use in an optical pickup apparatus and the lens satisfies the following formulas:
1≦D≦10
0.2≦ T/D≦ 0.5.
14. The optical element of claim 12 , wherein plural ring-shaped step portions are provided on the effective optical surface and satisfy the following formula:
0<Hi≦0.01
0.001≦Li≦0.1
where Hi is a depth (mm) of the plural ring-shaped step portions and Li is an interval (mm) of the plural ring-shaped step portions.
15. The optical element of claim 12 , wherein the base material is a lens array on which plural lens sections are mounted in a form of an array and satisfies the following formulas:
0<Di≦300
0< Ti/Di≦ 1.0
0<Li≦200
where Di is a diameter (mm) of a lens section, Ti is a thickness (mm) of the lens section and Li is an interval (mm) of the plural lens sections.
16. The optical element of claim 15 , wherein the lens array is a micro lens array and satisfies the following formulas:
0.01≦Di≦2
0.2≦ Ti/Di≦ 0.5
0.01≦Li≦5.
17. The optical element of claim 12 , wherein at least one of a concave or a convex is provided on the uneven surface of the base material.
18. The optical element of claim 17 , wherein plural convexes being shaped in one of a saw tooth and a rectangle are provided on the base material with an arrangement satisfying the following formulas:
0<Li≦30
0< Hi/Li≦ 3.0
0<Wi<Li
where Hi is a height (mm) of the convex, Wi is a width (mm) of the convex and Li is an interval (mm) of plural convexes.
19. The optical element of claim 18 , wherein some of the plural convexes are provided on the base material with a different interval Lk (mm) and satisfies the following formula:
0<Wi<Lk.
20. The optical element of claim 18 , wherein the base material is a light introducing plate satisfying the following formulas:
0.05≦Li≦2
0.01≦ Hi/Li≦ 0.1.
21. The surface treating method of claim 12 , wherein the base material is a prism satisfying the following formulas:
0<W≦30
0< H/W≦ 3.0
where H is a height (mm) of the prism and W is a width (mm) of the prism.
22. The surface treating method of claim 21 , wherein the prism is a micro prism satisfying the following formulas:
0.5≦W≦4.0
0.5≦H≦4.0.