Thin dual-aperture zoom digital camera
A dual-aperture zoom camera comprising a Wide camera with a respective Wide lens and a Tele camera with a respective Tele lens, the Wide and Tele cameras mounted directly on a single printed circuit board, wherein the Wide and Tele lenses have respective effective focal lengths EFL W and EFL T and respective total track lengths TTL W and TTL T and wherein TTL W /EFL W >1.1 and TTL T /EFL T <1.0. Optionally, the dual-aperture zoom camera may further comprise an optical OIS controller configured to provide a compensation lens movement according to a user-defined zoom factor (ZF) and a camera tilt (CT) through LMV=CT*EFL ZF , where EFL ZF is a zoom-factor dependent effective focal length.
1. A dual-aperture zoom camera, comprising:
a) a Wide camera that includes a Wide lens with an effective focal length EFL W and a total track length TTL W ; and
b) a Tele camera that includes a Tele lens with five lens elements and with an effective focal length EFL T , a total track length TTL T and a F number smaller than 3.2,
wherein the respective Wide and Tele lens total track lengths and effective focal lengths fulfill the conditions TTL W /EFL W >1.1 and TTL T /EFL T <1.0, wherein the Tele lens comprises, in order from an object side to an image side of the Tele lens and along an optical axis of the Tele lens, first, second, third, fourth and fifth lens elements, wherein a focal length f 1 of the first lens element of the Tele lens is smaller than TTL T /2.
2. The dual-aperture zoom camera of claim 1 , wherein a height difference between the Tele and Wide cameras is equal to or smaller than 1.65 mm.
3. The dual-aperture zoom camera of claim 1 , wherein a ratio e=EFL T /EFL W between the effective focal lengths of the Tele and Wide cameras is in the range 1.3-2.0.
4. The dual-aperture zoom camera of claim 3 , wherein a ratio TTL T /TTL W between the total track lengths of the Tele and Wide cameras is smaller than 0.8e.
5. The dual-aperture zoom camera of claim 1 , wherein a height of the dual-aperture zoom camera has a value between 4 mm and 8 mm.
6. The dual-aperture zoom camera of claim 1 , wherein an air gap between the third lens element and the fourth lens element is greater than TTL T /5.
7. The dual-aperture zoom camera of claim 1 , wherein an air gap between the first lens element and the second lens element is smaller than half a width of the second lens element.
8. The dual-aperture zoom camera of claim 1 , wherein an air gap between the fourth lens element and the fifth lens element is smaller than 1.5 times a width of the fifth lens element.
9. The dual-aperture zoom camera of claim 1 , wherein the F number is substantially equal to 2.8.
10. The dual-aperture zoom camera of claim 1 , wherein the fourth lens element and the fifth lens element have different dispersions.
11. The dual-aperture zoom camera of claim 1 , wherein the fourth and fifth lens elements have opposite refractive power signs.
12. The dual-aperture zoom camera of claim 1 , wherein the third lens element has negative refractive power.
13. The dual-aperture zoom camera of claim 5 , wherein the fourth lens element and the fifth lens element have opposite refractive power signs.
14. The dual-aperture zoom camera of claim 5 , wherein the third lens element has negative refractive power.
15. A dual-aperture zoom camera, comprising:
a) a Wide camera that includes a Wide lens with an effective focal length EFL W and a total track length TTL W , wherein TTL W /EFL W >1.1, and
b) a Tele camera that comprises a Tele lens with an effective focal length EFL T , a total track length TTL T of 6 millimeters or less and a ratio TTL T /EFL T <1.0, wherein the Tele lens includes, in order from an object side to an image side, a first lens element L 1 with positive refractive power and a focal length f 1 , a second lens element L 2 with negative refractive power and a focal length f 2 , a third lens element L 3 with negative refractive power and a focal length f 3 , a fourth lens element L 4 , and a fifth lens element L 5 , and wherein 1.2×|f 3 |>|f 2 |>1.5×f 1 .
16. The dual-aperture zoom camera of claim 15 , wherein the Tele lens has a F number smaller than 2.9.
17. The dual-aperture zoom camera of claim 15 , wherein lens element L 1 has a convex image-side surface.
18. The dual-aperture zoom camera of claim 15 , wherein lens element L 1 has a concave image-side surface.
19. The dual-aperture zoom camera of claim 15 , wherein lens element L 1 has an image-side surface diameter between 2.3 mm and 2.5 mm.
20. A dual-aperture zoom camera, comprising:
a) a Wide camera that includes a Wide lens with an effective focal length EFL W and a total track length TTL W , wherein TTL W /EFL W >1.1; and
b) a Tele camera that comprises a Tele lens having, in order from an object side to an image side, a first lens element L 1 with positive refractive power and a focal length f 1 , a second lens element L 2 with negative refractive power, a third lens element L 3 , a fourth lens element L 4 , and a fifth lens element L 5 ,
wherein the Tele lens has an effective focal length EFL T , a total track length TTL T of 6.0 millimeters or less and a ratio TTL T /EFL T <1.0, wherein a F number of the Tele lens is smaller than 2.9, wherein f 1 is smaller than TTL T /2, wherein lens elements L 3 and L 4 are separated by a gap greater than TTL T /5, wherein lens elements L 4 and L 5 are separated by a gap smaller than TTL T /20, and wherein the five lens elements are made of plastic.
21. The dual-aperture zoom camera of claim 20 , wherein F number=2.8.
22. The dual-aperture zoom camera of claim 20 , wherein the ratio TTL T /EFL T is between 0.85 and 0.95.
23. The dual-aperture zoom camera of claim 20 , wherein a combined power of lens elements L 2 and L 3 is negative.