US 8,786,964 B2Granted

Photographing lens assembly

AssigneeLargan Precision Co., Ltd.

InventorsTsung-Han Tsai, Wei-Yu Chen

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Abstract

A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element and a third lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region. The second lens element with negative refractive power has an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material and the surfaces thereof are aspheric. The third lens element with negative refractive power has an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the surfaces thereof are aspheric.

Claims22

Dependent claims

A photographing lens assembly comprising, in order from an object side to an image side:

a first lens element with positive refractive power having an object-side surface being convex at a paraxial region;
a second lens element with negative refractive power having an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens element is made of plastic material and the object-side surface and the image-side surface of the second lens element are aspheric;
and
a third lens element with negative refractive power having an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the object-side surface and the image-side surface of the third lens element are aspheric;
wherein the photographing lens assembly has a total of three lens elements with refractive power;
a distance in parallel with an optical axis from a maximum effective diameter position on the image-side surface of the second lens element to an axial vertex on the image-side surface of the second lens element is SAG22, a central thickness of the second lens element is CT2, and the following relationship is satisfied:
0<SAG22/CT2<0.40.

4 more elements

A photographing lens assembly comprising, in order from an object side to an image side:

a first lens element with positive refractive power having an object-side surface being convex at a paraxial region;
a second lens element with negative refractive power having an object-side surface being concave at a paraxial region and an image-side surface being concave or planar at a paraxial region, wherein the second lens ent is made of plastic material, and the object-side surface and the image-side surface of the second lens element are aspheric;
and
a third lens element with negative refractive power having an object-side surface being concave at a paraxial region, and an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein the third lens element is made of plastic material, and the object-side surface and the image-side surface of the third lens element are aspheric;
wherein the photographing lens assembly has a total of three lens elements with refractive power;
a curvature radius of the object-side surface of the second lens element R3, a curvature radius of the image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, a focal length of the photographing lens assembly is f, and the following relationships are satisfied:
−1.5<R3/R4≦0;
−0.5<R6/R5<0;
and
0<f/|R4|+f/|R5|<0.80.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/647,401Filed 9 Oct 2012
Priority: TW 101114199 A20 Apr 2012
Published: US 2013/0279025 A124 Oct 2013
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G02B 13/0035
Having at least one aspherical surface: having three lenses
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 13/18
Optical objectives specially designed for the purposes specified below: with lenses having one or more non-spherical faces, e.g. for reducing…
G02B
Optical elements, systems or apparatus

Family

US 2013/0279025 A1Pre-grant publication · published 24 Oct 2013
US 8,786,964 B2This patent

From the US filing history. Foreign family members aren’t listed.

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