Patent ID: 11899182
Assignee: MAXELL, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An imaging lens comprising exactly seven lenses, the imaging lens including, sequentially from an object side:
a first lens having a negative power and being concave on an image side;
a second lens having a negative power and being concave on the image side;
a third lens having a positive power and being convex on an object side;
an aperture stop;
a fourth lens having a positive power and being convex on the image side;
a fifth lens;
a sixth lens whose object side is bonded to the image side of the fifth lens; and
a seventh lens being convex on the image side,
wherein expressions (1) and (2) are satisfied:

−3.0<f5/f<−2.2  (1).

2.8<f4/f<3.5  (2).

where a focal length of the fifth lens is f5, a focal length of the fourth lens is f4 and a focal length of an entire lens optical system is f.