US 2015/0029383 A1Published application

Image lens assembly and image capturing device

AssigneeLargan Precision Co., Ltd.

InventorsTsung-Han TSAI, Wei-Yu CHEN

Life of this patent

Estimating the term…

Loading patent…

Abstract

An image lens assembly includes five lens elements with refractive power, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element has refractive power. The second lens element with positive refractive power has a convex image-side surface in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the surfaces thereof are aspheric. The fifth lens element with refractive power has a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one convex shape in an off-axis region thereof, and the surfaces thereof are aspheric.

Claims27

Dependent claims

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

a first lens element having refractive power;
a second lens element with positive refractive power having a convex image-side surface in a paraxial region thereof;
a third lens element having positive refractive power;
a fourth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric;
and
a fifth lens element with refractive power having a concave image-side surface in a paraxial region thereof, wherein the image-side surface of the fifth lens element has at least one convex shape in an off-axis region thereof, and an object-side surface and the image-side surface of the fifth lens element are aspheric;
wherein the image lens assembly has a total of five lens elements with refractive power, each of the five lens elements of the image lens assembly is separated from each other, an axial distance between an object-side surface of the first lens element and an image plane is TL, a curvature radius of an image-side surface of the first lens element is R2, and the following condition is satisfied:
TL/R2<3.0.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/954,987Filed 31 Jul 2013
Priority: TW 10212630223 Jul 2013
Published: 29 Jan 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 3/04
With non-spherical faces: with continuous faces that are rotationally symmetrical but deviate from a true sphere , e.g. so called "aspheric" 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 13/04
Optical objectives specially designed for the purposes specified below: reversed telephoto objectives