Camera lens

Patent metadata

Field	Value
Publication number	US-9703079-B1
Application number	US-201615230594-A
Country	US
Kind code	B1
Filing date	Aug 8, 2016
Priority date	Mar 25, 2016
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A camera lens is disclosed. The camera lens includes four piece ultra-thin and wide angle lenses with excellent optical properties and with chromatic aberration sufficiently corrected as follows: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power; which are arranged sequentially from object side. The camera lens is characterized in that it meets specified conditions.

First claim

What is claimed is:

1. A camera lens comprising, in an order from an object side to an image side:
a first lens with positive refractive power;
a second lens with negative refractive power;
a third lens with positive refractive power;
a fourth lens with negative refractive power; wherein the camera lens satisfies the following conditions (1)˜(5):
1.10≦ f 1/ f≦ 1.20  (1);

−0.55≦ f 4/ f≦− 0.30  (2);

−2.00≦( R 1+ R 2)/( R 1− R 2)≦−1.25  (3);

1.50≦( R 5+ R 6)/( R 5− R 6)≦3.00  (4);

1.45≦( R 7+ R 8)/( R 7− R 8)≦3.00  (5);

where,
f: overall focal distance of the camera lens;
f1: focal distance of the first lens;
f4: focal distance of the fourth lens;
R1: curvature radius of the first lens' object side surface;
R2: curvature radius of the first lens' image side surface;
R5: curvature radius of the third lens' object side surface;
R6: curvature radius of the third lens' image side surface;
R7: curvature radius of the fourth lens' object side surface;
R8: curvature radius of the fourth lens' image side surface.

2. The camera lens as described in claim 1 further satisfying the following condition (6):
0.40≦ f 3/ f≦ 0.50  (6);

where,
f: overall focal distance of the camera lens;
f3: focal distance of the third lens.

Assignees

• Teraoka Hiroyuki
• Aac Technologies Pte Ltd

Inventors

• Teraoka Hiroyuki

Classifications

• G02B27/0025

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

• G02B13/005 Primary

  having spherical lenses only · CPC title

• G02B9/34

  having four components only · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title