US 9,316,817 B2Granted

Six-piece lens assembly for capturing images

AssigneeAbility Opto-Electronics Technology Co., Ltd.

InventorHung-Wen Lee

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Abstract

A six-piece lens assembly for capturing images is provided, which comprises an optical lens, an aperture stop, and an image-plane. The optical lens comprises six lenses as below. A first lens with positive refractive power has a convex image-side surface. A second lens with negative refractive power has a convex object-side surface. A third lens with refractive power has a concave image-side surface. A fourth lens has the refractive power. A fifth lens has a convex image-side surface and a convex object-side surface and a sixth lens has a concave image-side and a concave object-side surface. At least one of the object-side surface and the image-side surface of the second lens and the fourth lens are aspheric. At least one of the object-side surface and the image-side surface of the third lens, the fifth lens, and the sixth lens have at least one an inflection points.

Claims19

Dependent claims

A six-piece lens assembly for capturing images, comprising:

an optical lens for capturing images, in order from an object-side toward an image-side along an optical axis comprising:
a first lens element with positive refractive power having a convex image-side surface near the optical axis;
a second lens element with negative refractive power having a convex object-side surface near the optical axis, and at least one of the object-side and an image-side surfaces of the second lens element being aspheric;
a third lens element with refractive power having a concave image-side surface near the optical axis, and at least one of an object-side and the image-side surfaces of the third lens element having at least one inflection point;
a fourth lens element with refractive power near the optical axis, and at least one of an object-side and an image-side surfaces of the fourth lens element being aspheric;
a fifth lens element having a convex image-side surface and a convex object-side surface near the optical axis, and at least one of the object-side and the image-side surfaces of the fifth lens element having at least one inflection point;
and
a sixth lens element having a concave image-side surface and a concave object-side surface near the optical axis, and at least one of the object-side and the image-side surfaces of the sixth lens element having at least one inflection point;
an image-plane for imaging an object to be imaged;
and
an aperture stop disposed between the object and the first lens element;
wherein a distance from the object-side surface of the first lens element to the image-side surface of the sixth lens element is OL, and an entrance pupil diameter of the six-piece lens assembly for capturing images is EPD, and the aforementioned parameters are satisfied with the following relationship:
1.5<OL/EPD<2.5,
and an absolute value of a focal length of at least two of the six lens elements being less than 5 mm.

11 more elements

A six-piece lens assembly for capturing images, comprising:

an optical lens for capturing images, in order from an object-side toward an image-side along an optical axis comprising:
a first lens element with positive refractive power having a convex image-side surface near the optical axis;
a second lens element with negative refractive power having a convex object-side surface near the optical axis, and at least one of the object-side and an image-side surfaces of the second lens element being aspheric;
a third lens element with positive refractive power having a concave image-side surface near the optical axis, and at least one of an object-side and the image-side surfaces of the third lens element having at least one inflection point;
a fourth lens element with refractive power near the optical axis, and at least one of an object-side and an image-side surfaces of the fourth lens element having at least one inflection point;
a fifth lens element with positive refractive power having a convex image-side surface and a convex object-side surface near the optical axis, and at least one of the object-side and the image-side surfaces of the fifth lens element having at least one inflection point;
and
a sixth lens element with negative refractive power having a concave image-side surface and a concave object-side surface near the optical axis, and at least one of the object-side and the image-side surfaces of the sixth lens element having at least one inflection point;
an image-plane for imaging an object to be imaged;
and
an aperture stop;
wherein an absolute value of a focal length of at least two of the six lens elements is less than 5 mm, 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, and the aforementioned parameters are satisfied with the following relationship:
R5−R4<0.5 mm.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/611,567Filed 2 Feb 2015
Priority: TW 103124346 A16 Jul 2014
Published: US 2016/0018627 A121 Jan 2016
Granted: 19 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G02B 13/0045
Having at least one aspherical surface: having five or more lenses
G02B 9/62
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having six…
G02B 5/208
Filters: for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
G02B
Optical elements, systems or apparatus