US 8,780,459 B2Granted

Optical imaging lens system

AssigneeLargan Precision Co., Ltd.

InventorsChun-Shan Chen, Hsin-Hsuan Huang

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Abstract

This invention provides an optical imaging lens system in order from an object side to an image side comprising five non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface; a second lens element with positive refractive power; a third lens element with negative refractive power, and both surfaces being aspheric; a fourth lens element having a convex image-side surface, and both surfaces being aspheric; and a plastic fifth lens element having a concave image-side surface, both surfaces being aspheric, and at least one inflection point is formed on at least one of the surfaces thereof. By such arrangement, the refractive power of the optical imaging lens system can be effectively distributed with improved light converging power so that the total track length can be shortened effectively, and the aberration of system can be corrected to facilitate high image quality.

Claims25

Dependent claims

An optical imaging lens system having non-cemented lens elements with refractive power in a total number of five, in order from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface;
a second lens element with positive refractive power;
a third lens element with negative refractive power, and both the object-side and image-side surfaces thereof being aspheric;
a fourth lens element having a convex image-side surface, and both the object-side and image-side surfaces thereof being aspheric;
and
a plastic fifth lens element having a concave image-side surface, with both the object-side and image-side surfaces thereof being aspheric, and having at least one inflection point positioned on at least one of the object-side and image-side surfaces thereof;
wherein a maximal effective radial distance on the image-side surface of the fifth lens element is SD52, a maximal effective radial distance on the image-side surface of the fourth lens element is SD42, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the second lens element and the third lens element is T23, a distance between a non-axial critical point of the image-side surface of the fifth lens element and the optical axis is Yp52, and they satisfy the following relations:
0.25<(SD52−SD42)/TD<0.60;
0.1<T34/T23<2.8;
and
0.3<Yp52/SD52<0.95.

8 more elements

An optical imaging lens system having non-cemented lens elements with refractive power in a total number of five, in order from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface;
a second lens element with positive refractive power;
a third lens element with both the object-side and image-side surfaces thereof being aspheric;
a fourth lens element with positive refractive power and with both the object-side and image-side surfaces thereof being aspheric;
and
a plastic fifth lens element having a concave image-side surface, with both the object-side and image-side surfaces thereof being aspheric, and having at least one inflection point positioned on at least one of the object-side and image-side surfaces thereof;
wherein the optical imaging lens system further comprises an image plane;
an axial distance between the object-side surface of the first lens element and the image plane is TTL, a maximum image height of the optical imaging lens system is ImgH, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the second lens element and the third lens element is T23, a distance between a non-axial critical point of the image-side surface of the fifth lens element and an optical axis is Yp52, a maximal effective radial distance on the image-side surface of the fifth lens element is SD52, and they satisfy the following relations:
TTL/ImgH<1.6;
0.1<T34/T23<2.8;
and
0.3<Yp52/SD52<0.95.

9 more elements

An optical imaging lens system having non-cemented lens elements with refractive power in a total number of five, in order from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface;
a second lens element with positive refractive power;
a third lens element with both the object-side and image-side surfaces thereof being aspheric;
a fourth lens element with both the object-side and image-side surfaces thereof being aspheric;
and
a plastic fifth lens element having a concave image-side surface, with both the object-side and image-side surfaces thereof being aspheric, and having at least one inflection point positioned on at least one of the object-side and image-side surfaces thereof;
wherein half of the maximal field of view of the optical imaging lens system is HFOV, a curvature radius of the image-side surface of the fifth lens element is R10, a focal length of the optical imaging lens system is f, a distance between a non-axial critical point of the image-side surface of the fifth lens element and an optical axis is Yp52, a maximal effective radial distance on the image-side surface of the fifth lens element is SD52, and they satisfy the following relations:
40 deg<HFOV<55 deg;
0<R10/f<0.4;
and
0.3<Yp52/SD52<0.95.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/592,046Filed 22 Aug 2012
Priority: TW 101112176 A6 Apr 2012
Published: US 2013/0265650 A110 Oct 2013
Granted: 15 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 9/60
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having five…
G02B 13/008
Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras: designed for infrared light
G02B 13/18
Optical objectives specially designed for the purposes specified below: with lenses having one or more non-spherical faces, e.g. for reducing…