US 2021/0080692 A1 · IMAGING LENS

Abstract

An imaging lens includes a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave at a paraxial region thereof. The seventh lens is formed in a shape so that a surface thereof on the image plane side is aspheric. The first lens and the second lens have a specific composite focal length. The third lens have a specific focal length. The fourth lens and the fifth lens have a specific composite focal length. The sixth lens and the seventh lens have a specific composite focal length.

Claims20

Dependent claims

An imaging lens comprising:

a first lens;
a second lens;
a third lens;
a fourth lens;
a fifth lens;
a sixth lens;
and
a seventh lens, arranged in this order from an object side to an image plane side,
wherein said sixth lens is formed in a shape so that a surface thereof on the image plane side is concave at a paraxial region thereof,
said seventh lens is formed in a shape so that a surface thereof on the image plane side is aspheric, and
said first lens and said second lens have a composite focal length f12, said third lens has a focal length f3, said fourth lens and said fifth lens have a composite focal length f45, and said sixth lens and said seventh lens have a composite focal length f67 so that the following conditional expressions are satisfied:
−1.0<f12/f3<−0.1,
−3<f45/f67<−0.8.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/109,451Filed 2 Dec 2020

Priority

JP 2014-08353015 Apr 2014

Published

18 Mar 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G02B 9/64
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having more…
G02B 5/005
Optical elements other than lenses: diaphragms
G02B 9/12
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having three…
G02B 13/0045
Having at least one aspherical surface: having five or more lenses

Family

Application15/260,399Continuation · filed 9 Sep 2016

Application15/925,903Continuation · filed 20 Mar 2018

Application16/445,759Continuation · filed 19 Jun 2019

Application17/109,451Continuation

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