Patent ID: 11874440
Assignee: TOKYO VISIONARY OPTICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. An imaging lens comprising in order from an object side to an image side,
a first lens,
a second lens,
a third lens having negative refractive power,
a fourth lens,
a fifth lens,
a sixth lens, and
a seventh lens having negative refractive power, wherein the following conditional expressions (2a), (16) and (17) are satisfied:

−7.1<f2/f<−2.5  (2a)

2.5≤|f34|/f<12.0  (16)

1.7<f5/f<4.5  (17), where, f: a focal length of the overall optical system,, f2: a focal length of the second lens,, f5: a focal length of the fifth lens, and, f34: a composite focal length of the third lens and the fourth lens.