Five-aspheric-surface wafer-level lens systems having wide viewing angle
A wafer-level lens system includes a first substrate, a first lens having a planar surface in contact with the first substrate and a concave aspheric surface, a second substrate, a second lens having a convex aspheric surface facing the first lens and a planar surface in contact with the second substrate, a third lens having a planar surface in contact with the second substrate and a concave aspheric surface, a third substrate, a fourth lens having a convex aspheric surface facing the third lens and a planar surface in contact with the third substrate, and a fifth lens having a planar surface in contact with the third substrate and a concave aspheric surface.
1. A lens system, comprising:
a first substrate having an outside surface;
a first lens having a concave aspheric surface and a focal length F1;
a second lens having a convex aspheric surface facing the first lens and a focal length F2; and
a third lens having a concave aspheric surface and a focal length F3;
wherein the lens system satisfies the following conditions:
0.2 <EFFL/TTL< 0.5;
−0.75 <EFFL/F 1<−0.35;
1 <EFFL/F 2<1.4;
−0.65 <EFFL/F 3<−0.15;
V 2 >V 3 and V 3<35;
wherein: (i) EFFL is an effective focal lens of the lens system; (ii) TTL is a distance from the outside surface of the first substrate to an image plane; and (iii) V2 is an Abbe number of the second lens, and V3 is an Abbe number of the third lens.
2. The lens system of claim 1 , further comprising a second substrate, the second substrate being sandwiched between the second lens and the third lens.
3. The lens system of claim 2 , wherein:
the first lens further comprises a planar surface in contact with the first substrate opposite to the outside surface;
the second lens further comprises a planar surface in contact with the second substrate; and
the third lens further comprises a planar surface in contact with the second substrate.
4. The lens system of claim 3 , further comprising a stop interposed between the second substrate and the third lens.
5. The lens system of claim 4 , further comprising:
a fourth lens having a convex aspheric surface facing the third lens;
a fifth lens having a concave aspheric surface; and
a third substrate, the third substrate being sandwiched between the fourth lens and the fifth lens.
6. The lens system of claim 5 , wherein:
the fourth lens further comprises a planar surface in contact with the third substrate; and
the fifth lens further comprises a planar surface in contact with the third substrate.
7. The lens system of claim 6 , wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of reflow-compatible materials.
8. The lens system of claim 6 , wherein a glass plate is disposed between the fifth lens and the image plane.
9. The lens system of claim 8 , wherein the glass plate is a cover glass of an image sensor.
10. The lens system of claim 6 , wherein a field of view of the lens system is equal to or greater than 90°.
11. The lens system of claim 6 , wherein a total length of the lens system from the outer surface of the first substrate to the image plane is equal to or less than 5 mm.
12. The lens system of claim 6 , wherein an effective focal length of the lens system is equal to or less than 2 mm.
13. The lens system of claim 6 , wherein an F-number of the lens system is equal to or less than 3.2.
14. The lens system of claim 6 , wherein each of the first substrate, the second substrate, and the third substrate has two parallel planar surfaces.
15. The lens system of claim 6 , wherein the lens system comprises a wafer-level lens.
16. A lens system, comprising:
a first substrate having an outside surface;
a first lens having a planar surface in contact with the first substrate opposite to the outside surface and a concave aspheric surface;
a second substrate;
a second lens having a convex aspheric surface facing the first lens and a planar surface in contact with the second substrate;
a third lens having a planar surface in contact with the second substrate and a concave aspheric surface;
wherein the second substrate is sandwiched between the second lens and the third lens;
a third substrate;
a fourth lens having a convex aspheric surface facing the third lens and a planar surface in contact with the third substrate; and
a fifth lens having a planar surface in contact with the third substrate and a concave aspheric surface;
wherein the third substrate is sandwiched between the fourth lens and the fifth lens;
wherein the lens system satisfies the following conditions:
0.2 <EFFL/TTL< 0.5;
−0.75 <EFFL/F 1<−0.35;
1 <EFFL/F 2<1.4;
−0.65 <EFFL/F 3<−0.15;
V 2 >V 3 and V 3<35;
wherein: (i) EFFL is an effective focal lens of the lens system; (ii) TTL is a distance from the outside surface of the first substrate to an image plane; (iii) F1, F2, and F3 are focal lengths of the first lens, the second lens, and the third lens, respectively; and (iv) V2 is an Abbe number of the second lens, and V3 is an Abbe number of the third lens.
17. The lens system of claim 16 , wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of reflow-compatible materials.
18. The lens system of claim 16 , wherein the lens system comprises a wafer-level lens.
19. A wafer-level lens system, comprising:
a first substrate having an outside surface;
a first lens having a planar surface in contact with the first substrate opposite to the outside surface and a concave aspheric surface;
a second substrate;
a second lens having a convex aspheric surface facing the first lens and a planar surface in contact with the second substrate;
a third lens having a planar surface in contact with the second substrate and a concave aspheric surface;
wherein the second substrate is sandwiched between the second lens and the third lens;
a third substrate;
a fourth lens having a convex aspheric surface facing the third lens and a planar surface in contact with the third substrate; and
a fifth lens having a planar surface in contact with the third substrate and a concave aspheric surface;
wherein the third substrate is sandwiched between the fourth lens and the fifth lens;
wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of reflow-compatible materials;
wherein the lens system satisfies the following conditions:
0.2 <EFFL/TTL< 0.5;
−0.75 <EFFL/F 1<−0.35;
1 <EFFL/F 2<1.4;
−0.65 <EFFL/F 3<−0.15;
V 2 >V 3 and V 3<35;
wherein: (i) EFFL is an effective focal lens of the lens system; (ii) TTL is a distance from the outside surface of the first substrate to an image plane; (iii) F1, F2, and F3 are focal lengths of the first lens, the second lens, and the third lens, respectively; and (iv) V2 is an Abbe number of the second lens, and V3 is an Abbe number of the third lens.