Optical imaging system

Patent metadata

Field	Value
Publication number	US-2018180847-A1
Application number	US-201715631251-A
Country	US
Kind code	A1
Filing date	Jun 23, 2017
Priority date	Dec 28, 2016
Publication date	Jun 28, 2018
Grant date	—

Abstract

An optical imaging system includes: a plurality of lenses disposed along an optical axis; and a reflection member closer to an object than the plurality of lenses, and including a reflection surface configured to change a path of light; wherein the plurality of lenses are spaced apart from each other by preset distances along the optical axis; and the condition 0.9<DF/DC<1.3 is satisfied, where DF is an effective aperture radius of an image-side surface of a lens closest to an image sensor among the plurality of lenses, and DC is an effective aperture radius of an object-side surface of a lens closest to the reflection member among the plurality of lenses.

First claim

What is claimed is:

1 . An optical imaging system comprising:
a plurality of lenses disposed along an optical axis; and a reflection member disposed closer to an object than the plurality of lenses, and comprising a reflection surface configured to change a path of light; wherein the plurality of lenses are spaced apart from each other by preset distances along the optical axis; and the condition 0.9<DF/DC<1.3 is satisfied, where DF is an effective aperture radius of an image-side surface of a lens closest to an image sensor among the plurality of lenses, and DC is an effective aperture radius of an object-side surface of a lens closest to the reflection member among the plurality of lenses.

2 . The optical imaging system of claim 1 , wherein the condition FOV≤40 is satisfied, where FOV is a field of view of an optical system comprising the plurality of lenses.

3 . The optical imaging system of claim 1 , wherein the condition 1.3<TTL/BFL<3.5 is satisfied, where TTL is a distance from the object-side surface of the lens closest to the reflection member to an imaging plane of the image sensor, and BFL is a distance from the image-side surface of the lens closest to the image sensor to the imaging plane of the image sensor.

4 . The optical imaging system of claim 1 , wherein the condition 0.8<TTL/f<1.5 is satisfied, where TTL is a distance from the object-side surface of the lens closest to the reflection member to an imaging plane of the image sensor, and f is an overall focal length of an optical system comprising the plurality of lenses.

5 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the plurality of lenses toward an image side of the optical system; and
the condition 0.6<f12/f<2.0 is satisfied, where f12 is a combined focal length of the first lens and the second lens, and f is an overall focal length of an optical system comprising the first, second, third, fourth, and fifth lenses.

6 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise:
a first lens having a positive refractive power, an object-side surface thereof being convex and an image-side surface thereof being concave; a second lens having a negative refractive power; a third lens having a negative refractive power, an image-side surface thereof being convex; a fourth lens, an object-side surface thereof being concave; and a fifth lens, an object-side surface thereof being convex; and the first, second, third, fourth, and fifth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, and fifth lenses to an image side of the optical system.

7 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise:
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; and a fifth lens having a positive refractive power; and the first, second, third, fourth, and fifth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, and fifth lenses toward an image side of the optical system.

8 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise:
a first lens having a positive refractive power, an object-side surface and an image-side surface thereof being convex; a second lens having a negative refractive power, an object-side surface thereof being convex and an image-side surface thereof being concave; a third lens having a negative refractive power; a fourth lens having a negative refractive power; and a fifth lens; and the first, second, third, fourth, and fifth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, and fifth lenses toward an image side of the optical system.

9 . The optical imaging system of claim 8 , wherein an object-side surface and an image-side surface of the fifth lens are convex.

10 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, fifth, and sixth lenses toward an image side of the optical system; and
the condition 0.6<f12/f<2.0 is satisfied, where f12 is a combined focal length of the first lens and the second lens, and f is an overall focal length of an optical system comprising the first, second, third, fourth, fifth, and sixth lenses.

11 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise:
a first lens having a positive refractive power, an object-side surface and an image-side surface thereof being convex; a second lens having a negative refractive power, an object-side surface thereof being convex; a third lens, an object-side surface thereof being concave; a fourth lens, an object-side surface thereof being convex; a fifth lens; and a sixth lens, an object-side surface and an image-side surface thereof being convex; and the first, second, third, fourth, fifth, and sixth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, fifth, and sixth lenses toward an image side of the optical system.

12 . The optical imaging system of claim 1 , wherein the plurality of lenses comprise:
a first lens having a positive refractive power, an object-side surface and an image-side surface thereof being convex; a second lens having a negative refractive power, an object-side surface thereof being convex; a third lens, an object-side surface thereof being concave; a fourth lens; a fifth lens, an object-side surface thereof being concave; and a sixth lens, an object-side surface and an image-side surface thereof being convex; and the first, second, third, fourth, fifth, and sixth lenses are sequentially disposed in numerical order beginning with the first lens from an object side of an optical system comprising the first, second, third, fourth, fifth, and sixth lenses toward an image side of the optical system.

13 . The optical imaging system of claim 1 , wherein the lens closest to the reflection member and the lens closest to the image sensor are plastic lenses made of a first plastic material; and
remaining lenses of the plurality of lenses are plastic lenses respectively made of other plastic materials having respective optical characteristics that are different from optical characteristics of the first plastic material, and different from one another, such that each one of the remaining lenses is made of a plastic material having optical characteristics that are different from the optical characteristics of the first plastic material, and different from the respective optical characteristics of the respective plastic materials of which all other ones of the remaining lenses are made.

14 . An optical imaging system comprising:
a plurality of lenses disposed along an optical axis; and a reflection

Assignees

• Samsung Electro Mech

Inventors

• Yoo Ho Sik

Classifications

• G03B17/17 Primary

  with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera · CPC title

• G02B13/0065

  having a beam-folding prism or mirror · CPC title

• G02B27/0025

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

• G02B13/0045 Primary

  having five or more lenses · CPC title

• G02B13/001 Primary

  Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras (G02B23/243 takes precedence) · CPC title