Low total track length lens assembly including seven lenses of +−+−++− refractive powers for large sensor format
Lens assemblies comprising from an object side to an image side, seven lens elements numbered L1-L7; an optical window; and an image sensor having a sensor diagonal length (SDL), wherein an exemplary lens assembly has a total track length TTL that includes the optical window an effective focal length EFL and a field of view (FOV), wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein FOV<90 degrees, wherein a normalized thickness standard deviation constant T_STD of at least four of the seven lens elements complies with T_STD<0.035, and wherein a focal length f 1 of lens element L1 fulfills f 1 /EFL<0.95.
1. A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, wherein a focal length f 1 of lens element L1 fulfills f 1 /EFL<0.95 and wherein lens element L1 is convex on the object side, and wherein TTL/SDL<0.63.
2. The lens assembly of claim 1 , wherein each element has a clear aperture (CA) and wherein a CA of lens elements L3 or L4 is the smallest of all CAs in the lens assembly.
3. The lens assembly of claim 1 , wherein TTL/EFL<1.090.
4. The lens assembly of claim 1 , wherein TTL/EFL<1.083.
5. The lens assembly of claim 1 , wherein TTL/SDL<0.61.
6. The lens assembly of claim 1 , wherein a central thickness CT of at least 6 of the 7 lens elements complies CT/TTL<0.07.
7. The lens assembly of claim 1 , wherein the T_STD of at least 5 of the 7 lens elements complies with T_STD≤0.064714.
8. The lens assembly of claim 1 , wherein the T_STD of at least 5 of the 7 lens elements complies with T_STD≤0.043499.
9. The lens assembly of claim 1 , wherein f 1 /EFL<0.9.
10. The lens assembly of claim 1 , wherein f 1 /EFL<0.85.
11. A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, wherein a focal length f 1 of lens element L1 fulfills f 1 /EFL<0.95, wherein lens element L1 is convex on the object side, and wherein a focal length f 5 of lens element L5 fulfills |f 5 /EFL|>4.0.
12. The lens assembly of claim 11 , wherein a focal length f 5 of lens element L5 fulfills |f 5 /EFL|>6.0.
13. The lens assembly of claim 11 , wherein a focal length f 5 of lens element L5 fulfills |f 5 /EFL|>8.0.
14. The lens assembly of claim 1 , wherein a focal length f 6 of lens element L6 fulfills f 6 /EFL|>15.0.
15. The lens assembly of claim 1 , wherein a focal length f 6 of lens element L6 fulfills f 6 /EFL|>30.0.
16. The lens assembly of claim 1 , wherein a focal length f 6 of lens element L6 fulfills f 6 /EFL|>45.0.
17. The lens assembly of claim 1 , wherein a normalized gap standard deviation constant G_STD of a gap between lens elements L1 and L2 complies with G_STD=0.005903.
18. The lens assembly of claim 1 , wherein SDL=12 mm and wherein FOV<82.1 degrees.
19. A lens assembly comprising: from an object side to an image side,
seven lens elements numbered L1-L7, wherein the lens elements have, starting with lens element L1, a power sign sequence of positive-negative-positive-negative-positive-positive-negative;
an optical window; and
an image sensor having a sensor diagonal length (SDL),
wherein the lens assembly has a total track length TTL that includes the optical window, an effective focal length EFL and a field of view (FOV)<90 degrees, wherein TTL/EFL<1.100, wherein TTL/SDL<0.64, wherein a normalized thickness standard deviation constant T_STD of four of the seven lens elements complies with T_STD≤0.02971, and wherein a focal length f 1 of lens element L1 fulfills f 1 /EFL<0.95 and wherein lens element L1 is convex on the object side.