Optical lens
An optical lens includes a substrate, at least one derivative structure and a diffractive optical structure. The substrate has an optically operable region and a derivatively operable region. The derivatively operable region is arranged around the optically operable region. The derivative structure is disposed on the derivatively operable region to increase structural strength of the optical lens and to reduce the stray light as being assembled in a module. The diffractive optical structure is disposed on the optically operable region, and includes a microstructure pattern for generating a structured light and/or correcting the optical defects. Consequently, the optical lens is suitable for miniaturization and assembling applications to a module.
1. An optical lens, comprising:
a substrate having an optically operable region and a derivatively operable region, wherein the derivatively operable region is arranged around the optically operable region, and the substrate comprises at least one perforation, and at least one microstructure is arranged around the at least one perforation, wherein when a light beam strikes an edge of the at least one perforation, the at least one microstructure destroys edge diffraction of the light beam;
at least one derivative structure disposed on the derivatively operable region, wherein the derivative structure has a surface obliquely extended upwardly and outwardly or the derivative structure covers a corner of the substrate; and
a diffractive optical structure disposed on the optically operable region, and having at least one microstructure pattern, wherein a structured light is generated after a light beam passes through the at least one microstructure pattern, and/or at least one optical defect is corrected by the at least one microstructure pattern.
2. The optical lens according to claim 1 , wherein the at least one optical defect includes aberration or chromatic dispersion.
3. The optical lens according to claim 1 , wherein the maximum thickness of the optical lens is smaller than 0.4 mm.
4. The optical lens according to claim 1 , wherein a difference between refractive indexes of any two of the diffractive optical structure, the at least one derivative structure and the substrate is smaller than 5%.
5. The optical lens according to claim 1 , wherein the diffractive optical structure is formed on the substrate by an imprinting process or a spray coating process.
6. The optical lens according to claim 1 , wherein the at least one derivative structure is formed on the substrate by an imprinting process or a spray coating process.
7. The optical lens according to claim 1 , wherein the at least one derivative structure is assembled with a barrel, wherein while the at least one derivative structure is assembled with the barrel, the at least one derivative structure increases structural strength of the optical lens and/or reduces a portion of a stray light to be diffused or directed toward the optically operable region.
8. The optical lens according to claim 1 , wherein the at least one derivative structure includes a stray-light absorption structure.
9. The optical lens according to claim 8 , wherein the at least one derivative structure includes a small-scale micro-structure patterns in a distribution like moth-eye-like structure or a distributed regular structure with multiple layer like a crystal in which the orientation of each layer is specified.
10. The optical lens according to claim 8 , wherein the stray-light absorption structure has absorptivity larger than 80%.
11. The optical lens according to claim 1 , wherein the at least one derivative structure comprises plural derivative structures, wherein the plural derivative structures are symmetrically arranged with respect to an optical axis of the optical lens.
12. The optical lens according to claim 1 , wherein the derivative structure provides a directional mark while the optical lens is installed.
13. The optical lens according to claim 1 , wherein the optical lens is applied to a tilt-shift optical system, and the at least one derivative structure comprises plural derivative structures, wherein the plural derivative structures are asymmetrically arranged.
14. The optical lens according to claim 1 , wherein the at least one derivative structure comprises plural convex structures, and the plural convex structures are discretely arranged on the optically operable region at regular intervals with respect to a center of the optical lens.
15. The optical lens according to claim 1 , wherein a surface of the substrate has the optically operable region and the derivatively operable region, wherein the surface of the substrate is a flat surface or a curved surface.
16. The optical lens according to claim 1 , wherein the substrate has a circular shape or a rectangular shape.
17. The optical lens according to claim 1 , wherein the substrate is a prism or a polygonal block.
18. The optical lens according to claim 1 , wherein at least one of an anti-reflection coating and a high reflection coating is further formed on the optical lens.
19. The optical lens according to claim 18 , wherein the anti-reflection coating has transmittance larger than 95%.