Annular optical spacer and optical lens system
An annular optical spacer includes an outer annular surface, an inner annular surface, a first side surface, a second side surface and a plurality of protruding structures. The inner annular surface surrounds a central axis of the annular optical spacer and is opposite to the outer annular surface. The first side surface connects the outer annular surface with the inner annular surface. The second side surface connects the outer annular surface with the inner annular surface and is opposite to the first side surface. The protruding structures are regularly disposed on the inner annular surface. Each of the protruding structures extends along a direction from the first side surface to the second side surface and is integrated with the inner annular surface.
1. An annular optical spacer, comprising:
an outer annular surface;
an inner annular surface surrounding a central axis of the annular optical spacer and opposite to the outer annular surface;
a first side surface connecting the outer annular surface with the inner annular surface;
a second side surface connecting the outer annular surface with the inner annular surface and opposite to the first side surface; and
a plurality of protruding structures regularly disposed on the inner annular surface, wherein each of t he protruding structures extends along a direction from the first side surface to the second side surface, and each of the protruding structures is integrated with the inner annular surface.
2. The annular optical spacer of claim 1 , wherein there is a shortest distance between each of the protruding structures and the central axis of the annular optical spacer, and the shortest distances are the same.
3. The annular optical spacer of claim 2 , wherein a light absorption rate of the annular optical spacer is Ac, and the following relationship is satisfied:
Ac>90%.
4. The annular optical spacer of claim 2 , wherein the annular optical spacer is made of plastic material.
5. The annular optical spacer of claim 2 , wherein the annular optical spacer is made of metallic material.
6. The annular optical spacer of claim 2 , wherein a shortest distance between the first side surface and the central axis of the annular optical spacer is D 1 , a shortest distance between the second side surface and the central axis of the annular optical spacer is D 2 , and the following relationship is satisfied:
D1<D2.
7. The annular optical spacer of claim 6 , wherein the shortest distance between the first side surface and the central axis of the annular optical spacer is D 1 , the shortest distance between the second side surface and the central axis of the annular optical spacer is D 2 , and the following relationship is satisfied:
0.50< D 1/ D 2<0.90.
8. The annular optical spacer of claim 6 , wherein a distance between the first side surface and the second side surface in parallel with the central axis of the annular optical spacer is T 12 , a maximum outer diameter of the annular optical spacer is Dmax, and the following relationship is satisfied:
0.03< T 12/ D max<0.5.
9. The annular optical spacer of claim 8 , wherein the distance between the first side surface and the second side surface in parallel with the central axis of the annular optical spacer is T 12 , the maximum outer diameter of the annular optical spacer is Dmax, and the following relationship is satisfied:
0.05< T 12/ D max<0.2.
10. The annular optical spacer of claim 6 , further comprising:
a bent portion formed on the inner annular surface and located between the first side surface and the second side surface.
11. The annular optical spacer of claim 10 , wherein each of the protruding structures comprises a first protruding portion and a second protruding portion, the second protruding portions are disposed farther from the central axis of the annular optical spacer than the first protruding portions, the first protruding portions are disposed between the first side surface and the bent portion, and the second protruding portions are disposed between the bent portion and the second side surface.
12. The annular optical spacer of, claim 2 , wherein the protruding structures are equally spaced around the central axis of the annular optical spacer.
13. The annular optical pacer of claim 12 , wherein each of the protruding structures comprises:
a surface length, wherein the surface length is a farthest distance between two points on a surface of the protruding structure; and
a plurality of widths perpendicular to the surface length, wherein the widths become smaller as getting closer to the central axis of the annular optical spacer.
14. The annular optical spacer of claim 13 , wherein a cross-section of each of the protruding structures is triangular.
15. The annular optical spacer of claim 13 , wherein the protruding structures are connected with each other.
16. The annular optical spacer of claim 15 , wherein a maximum outer diameter of the annular optical spacer is Dmax, and the following relationship is satisfied:
Dmax<10 mm.
17. The annular optical spacer of claim 2 , wherein a cross-section of each of the protruding structures is arc-shaped.
18. The annular optical spacer of claim 17 , wherein a maximum curvature radius of each of the protruding structures is Rmax, and the following relationship is satisfied:
0.01 mm<Rmax.
19. The annular optical spacer of claim 17 , wherein the protruding structures have a same shape.
20. The annular optical spacer of claim 19 , wherein the protruding structures have a same size.
21. An optical lens system for mobile terminals, comprising:
a barrel;
a lens assembly disposed in the barrel; and
an annular optical spacer disposed in the barrel and connected with the lens assembly, the annular optical spacer comprising:
an outer annular surface;
an inner annular surface surrounding a central axis of the annular optical spacer and opposite to the outer annular surface;
a first side surface connecting the outer annular surface with the inner annular surface;
a second side surface connecting the outer annular surface with the inner annular surface and opposite to the first side surface; and
a plurality of protruding structures regularly disposed on the inner annular surface, wherein each of the protruding structures extends along a direction from the first side surface to the second side surface, and each of the protruding structures is integrated with the inner annular surface.