US 8,786,962 B2Granted

Photographing system

AssigneeLargan Precision Co., Ltd.

InventorsChun-Shan Chen, Hsiang-Chi Tang, Po-Lun Hsu, Ming-Ta Chou

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Abstract

A photographing system includes, 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 with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with positive refractive power is made of plastic material and has a convex object-side surface and a convex image-side surface. The fourth lens element with negative refractive power is made of plastic material and has a concave object-side surface and a convex image-side surface. The fifth lens element with refractive power is made of plastic material and has a concave image-side surface, wherein the fifth lens element has at least one inflection point. The object-side surfaces and the image-side surfaces of the third through fifth lens elements are aspheric.

Claims17

Dependent claims

A photographing system comprising, 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 negative refractive power;
a third lens element with positive refractive power made of plastic material and having a convex object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the third lens element are aspheric;
a fourth lens element with negative refractive power made of plastic material and having a concave object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric;
and
a fifth lens element with refractive power made of plastic material and having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point formed on at least one of the object-side surface and the image-side surface thereof;
wherein 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, 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, and a central thickness of the fifth lens element is CT5, the following relationships are satisfied:
−4.5<R5/R6<−1.0;
and
2.0<Td/CT5<4.4.

7 more elements

A photographing system comprising, 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 negative refractive power;
a third lens element with positive refractive power made of plastic material and having a convex object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the third lens element are aspheric;
a fourth lens element with negative refractive power made of plastic material and having a concave object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric;
and
a fifth lens element with refractive power made of plastic material having a concave image-side surface, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the fifth lens element has at least one inflection point formed on at least one of the object-side surface and the mage-side surface thereof;
wherein 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, an Abbe number of the third lens element is V3, and an Abbe number of the fourth lens element is V4, the following relationships are satisfied:
−5.5<R5/R6<0.0;
and
30<V3−V4<45.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/593,490Filed 23 Aug 2012
Priority: TW 100140534 A7 Nov 2011
Published: US 2013/0114151 A19 May 2013
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

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 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 13/18
Optical objectives specially designed for the purposes specified below: with lenses having one or more non-spherical faces, e.g. for reducing…

Family

US 2013/0114151 A1Pre-grant publication · published 9 May 2013
US 8,786,962 B2This patent

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

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