Slim pop-out wide camera lenses
Pop-out lens systems for compact digital cameras, comprising an image sensor and a lens with a field of view FOV>60 deg and having i lens elements L1-Li starting with L1 from an object side toward an image side, each lens element Li having a respective focal length f i , the lens elements divided into two lens groups G1 and G2 separated by a big gap (BG), the lens having a pop-out total track length TTL<20 mm in a pop-out state and a collapsed total track length c-TTL in a collapsed state, wherein BG>0.25×TTL, wherein either G1 can move relative to G2 and to the image sensor for focusing or G1 and G2 can move together relative to the image sensor for focusing, and wherein a ratio c-TTL/TTL<0.7.
1. A lens system for a compact digital camera, comprising:
an image sensor having a sensor diagonal (SD); and
a lens with a field of view (FOV)>60 deg and having a f number (f/#), a lens thickness (T Lens ), a back focal length (BFL), an effective focal length (EFL) and N≥6 lens elements L1-LN arranged along a lens optical axis (OA) starting with L1 from an object side toward an image side, each lens element Li having a respective focal length f i with a magnitude |f i |, the lens having a pop-out total track length (TTL): wherein TTL<20 mm in a pop-out state and a collapsed total track length (c-TTL) in a collapsed state, wherein the lens system is configured to switch from a pop-out state to a collapsed state by collapsing BFL to a collapsed BFL, wherein SD≥12 mm, wherein BFL>0.15×TTL, and wherein a ratio c-TTL/SD<0.65.
2. The lens system of claim 1 , wherein c-TTL/SD >0.4.
3. The lens system of claim 1 , wherein f/#<2.0.
4. The lens system of claim 1 , wherein f/#<1.8.
5. The lens system of claim 1 , wherein f/#>1.5.
6. The lens system of claim 1 , wherein BFL>1.5 mm.
7. The lens system of claim 1 , wherein BFL<3.0 mm.
8. The lens system of claim 1 , wherein c-TTL/SD<0.6.
9. The lens system of claim 1 , wherein c-TTL/SD<0.55.
10. The lens system of claim 1 , wherein c-TTL/TTL<0.9.
11. The lens system of claim 1 , wherein BFL>0.15×TTL.
12. The lens system of claim 1 , wherein BFL>0.2×TTL.
13. The lens system of claim 1 , wherein SD=16.0 mm.
14. The lens system of claim 1 , wherein SD is in the range of 12-30 mm.
15. The lens system of claim 1 , wherein SD is in the range of 14-20 mm.
16. The lens system of claim 1 , wherein a distance between L1 and L2 is marked d L1-L2 and wherein a ratio d L1-L2 /T Lens <2%.
17. The lens system of claim 1 , wherein a distance between L1 and L2 is marked d L1-L2 and wherein a ratio d L1-L2 /T Lens <1%.
18. The lens system of claim 1 , wherein a focal length of a strongest lens element is marked f LS and wherein F LS /EFL<1.
19. The lens system of claim 1 , wherein a focal length of a second from last lens element is marked f N−1 and wherein f N−1 /EFL<2.
20. The lens system of claim 1 , wherein a focal length of a second from last lens element is marked f N−1 and wherein f N−1 /EFL<1.5.
21. The lens system of claim 1 , wherein N=6, wherein a thickness profile of L5 taken along an axis perpendicular to the OA of the lens has a local minimum, and wherein the location of the local minimum is not at a margin of L5.
22. The lens system of claim 1 , wherein N=6, wherein a thickness profile of L5 taken along an axis perpendicular to the OA of the lens has a local minimum, and wherein the location of the local minimum is not at a margin of L5.
23. The lens system of claim 1 , wherein N=6, wherein a thickness profile of L6 taken along an axis perpendicular to the OA of the lens has a local maximum, and wherein the location of the local maximum is not at a margin of L6.
24. The lens system of claim 1 , wherein N=6, wherein a sequence of lens powers for lens elements L1 to L6 is plus-minus-plus-plus-plus-minus.
25. The lens system of claim 1 , wherein N=7 and wherein an average distance between L1 and L2 measured along axes parallel to the OA marked μ L1-L2 and a standard deviation from the average distance marked “σ L1-L2 ” fulfill σ DL1-L2 /μ L1-L2 <0.5.
26. The lens system of claim 1 , wherein N=7 and wherein an average distance between L3 and L4 measured along axes parallel to the OA marked μ L3-L4 and a standard deviation from the average distance marked σ L3-L4 fulfill σ dL3-L4 /μ L3-L4 <0.3.
27. The lens system of claim 1 , wherein N=7, wherein L6 has a deflection point that is not located at the OA of the lens.
28. The lens system of claim 1 , wherein N=7, wherein a sequence of lens powers for lens elements L1 to L7 is minus-plus-plus-minus-minus-plus-minus.
29. The lens system of claim 1 , wherein N=8, wherein a thickness profile of L6 taken along an axis perpendicular to the OA of the lens has a local minimum, and wherein the location of the local minimum is not at a margin of L6.
30. The lens system of claim 1 , wherein N=8, wherein a sequence of lens powers for lens elements L1 to L8 is minus-minus-plus-minus-minus-plus-plus-minus.
31. The lens system of claim 1 , wherein N=8 and wherein an average distance between L1 and L2 measured along axes parallel to the OA marked μ L1-L2 and a standard deviation from the average distance marked σ L1-L2 fulfill σ DL1-L2 /μ L1-L2 <1.25.
32. The lens system of claim 1 , wherein N=8 and wherein an average distance between L2 and L3 measured along axes parallel to the OA marked μ L2-L3 and a standard deviation from the average distance marked σ L2-L3 fulfill σ dL2-L3 /μ L2-L3 <0.75.
33. The lens system of claim 1 , wherein N=8 and wherein an average distance between L3 and L4 measured along axes parallel to the OA marked μL3-L4 and a standard deviation from the average distance marked σ L3-L4 fulfill σ dL3-L4 /μ L3-L4 <0.1.
34. The lens system of claim 1 , wherein the lens system is included in a pop-out camera, wherein the pop-out camera is included in a smartphone.