Patent ID: 11899187
Assignee: TOKYO VISIONARY OPTICS CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An imaging lens forming an image of an object on an image sensor and comprising, in order from an object side to an image side,
a first lens with positive refractive power,
a second lens with negative refractive power,
a third lens with positive refractive power,
a fourth lens with positive refractive power,
a fifth lens,
a sixth lens,
a seventh lens with positive refractive power, and
an eighth lens with negative refractive power,
wherein said eighth lens has an aspheric image-side surface having at least one inflection point, and is in a form of a meniscus lens with the image-side surface being concave in the paraxial region, and the following conditional expressions are satisfied:

−5.00<f2/f<−2.00

10.00<f4/f<25.00

where
f: a focal length of the overall optical system of the imaging lens,
f2: a focal length of the second lens, and
f4: a focal length of the fourth lens.