Photographing optical lens assembly, imaging device and mobile terminal

Patent metadata

Field	Value
Publication number	US-2016011398-A1
Application number	US-201414464705-A
Country	US
Kind code	A1
Filing date	Aug 21, 2014
Priority date	Jul 14, 2014
Publication date	Jan 14, 2016
Grant date	—

Abstract

A photographing optical lens assembly comprises, 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 refractive power has a concave object-side surface in a paraxial region. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element with negative refractive power has an object-side and an image-side surfaces both being aspheric. The fifth lens element with refractive power has an aspheric object-side surface and an aspheric image-side surface being concave in a paraxial region with at least one inflection point. The photographing optical lens assembly has a total of five lens elements with refractive power.

First claim

1 . A photographing optical lens assembly consisting essentially of five lens elements, in order from an object side to an image side:
a first lens element having an object-side surface being concave in a paraxial region thereof; a second lens element; a third lens element; a fourth lens element having negative refractive power, both of an object-side surface and an image-side surface of the fourth lens element being aspheric; and a fifth lens element having an image-side surface being concave in a paraxial region thereof and at least one inflection point, both of an object-side surface and the image-side surface of the fifth lens element being aspheric; wherein an axial distance between the first lens element and the second lens element is shorter than an axial distance between the second lens element and the third lens element, a curvature radius of the image-side surface of the fifth lens element is R10, a focal length of the fourth lens element is f4, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied:
−2.0< R 10/ f 4<0; and

TL /Img H< 2.5.

2 . The photographing optical lens assembly of claim 1 , wherein an image-side surface of the first lens element is convex in a paraxial region thereof.

3 . The photographing optical lens assembly of claim 2 , wherein the object-side surface of the fifth lens element is convex in a paraxial region thereof.

4 . The photographing optical lens assembly of claim 3 , wherein the third lens element has positive refractive power.

5 . The photographing optical lens assembly of claim 3 , wherein an image-side surface of the third lens element is convex in a paraxial region thereof.

6 . The photographing optical lens assembly of claim 3 , wherein half of a maximal field of view of the photographing optical lens assembly is HFOV, and the following condition is satisfied:
35 degrees< HFOV< 55 degrees.

7 . The photographing optical lens assembly of claim 2 , wherein the first lens element has positive refractive power.

8 . The photographing optical lens assembly of claim 7 , wherein the object-side surface of the fourth lens element is concave in a paraxial region thereof and the image-side surface of the fourth lens element is convex in a paraxial region thereof.

9 . The photographing optical lens assembly of claim 7 , wherein a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following condition is satisfied:
0< CT 4/ CT 5<0.60.

10 . The photographing optical lens assembly of claim 7 , wherein a curvature radius of an object-side surface of the second lens element is R3, a curvature radius of an image-side surface of the second lens element is R4, a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, a curvature radius of the object-side surface of the fifth lens element is R9, the curvature radius of the image-side surface of the fifth lens element is R10, a shape factor of the second lens element is SF2, a shape factor of the fourth lens element is SF4, a shape factor of the fifth lens element is SF5, and the following conditions are satisfied:
SF 2=( R 3+ R 4)/( R 3− R 4);
SF 4=( R 7+ R 8)/( R 7− R 8);
SF 5=( R 9+ R 10)/( R 9− R 10);
0<|1/ SF 2|+|1/ SF 4|+|1/ SF 5|<0.90.

11 . The photographing optical lens assembly of claim 1 , wherein the photographing optical lens assembly further includes a stop, an axial distance between the stop and the image-side surface of the fifth lens element is SD, 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 the following condition is satisfied:
0.85< SD/TD< 1.2.

12 . The photographing optical lens assembly of claim 1 , wherein the object-side surface of the fourth lens element has the largest curvature among the first, second, third, fourth and fifth lens elements.

13 . The photographing optical lens assembly of claim 1 , wherein the axial distance between the object-side surface of the first lens element and the image surface is TL, the maximum image height of the photographing optical lens assembly is ImgH, and the following conditions are satisfied:
TL /Img H< 2.0.

14 . The photographing optical lens assembly of claim 1 , wherein a vertical distance between an off-axis tangential point of a tangent vertical to an optical axis on the image-side surface of the fifth lens element and the optical axis of the photographing optical lens assembly is Yc52, a curvature radius of the object-side surface of the first lens element is R1, and the following condition is satisfied:
−0.5< Yc 52/ R 1<0.

15 . The photographing optical lens assembly of claim 1 , wherein an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, and the following condition is satisfied:
0< T 12/ T 23<0.80.

16 . The photographing optical lens assembly of claim 1 , wherein a curvature radius of the object-side surface of the first lens element is R1, a focal length of the fourth lens element is f4, and the following condition is satisfied:
−7.0<Log( R 1/ f 4)<7.0.

17 . An imaging device, comprising:
the photographing optical lens assembly of claim 1 ; and an image sensor, wherein the image sensor is disposed on an image surface of the photographing optical lens assembly.

18 . A mobile terminal, comprising:
the imaging device of claim 17 .

19 . A photographing optical lens assembly consisting essentially of five lens elements, in order from an object side to an image side:
a first lens element with positive refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof; a second lens element having an image-side surface being concave in a paraxial region thereof; a third lens element; a fourth lens element having negative refractive power, both of an object-side surface and an image-side surface of the fourth lens element being aspheric; and a fifth lens element having an image-side surface being concave in a paraxial region thereof and at least one inflection point, both of an object-side surface and the image-side surface of the fifth lens element being aspheric; wherein a curvature radius of the image-side surface of the fifth lens element is R10, a focal length of the fourth lens element is f4, an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens assembly is ImgH, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the image-side surface of the first lens element is R2, and the following conditions are satisfied:
−2.0< R 10/ f 4<0;

TL /Img H< 2.5; and
1.00<( R 1+ R 2)/( R 1− R 2)<3.00.

20 . The photographing optical lens assembly of claim 19 , wherein the second lens element has negative refractive power, and the first through the fifth lens elements are non-cemented.

21 . The photographing optical lens assembly of claim 20 , wherein one of an object-side and

Assignees

• Largan Precision Co Ltd

Inventors

• Tsai Tsung-Han
• Huang Hsin-Hsuan

Classifications

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• G02B27/0025

  for optical correction, e.g. distorsion, aberration · CPC title

• G02B9/60

  having five components only · CPC title

• G02B13/0045 Primary

  having five or more lenses · CPC title