Optical lens assembly, device, and image forming method

Patent metadata

Field	Value
Publication number	US-12007532-B2
Application number	US-202017084898-A
Country	US
Kind code	B2
Filing date	Oct 30, 2020
Priority date	Nov 2, 2015
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

Provided are an optical lens assembly and an electronic device including the optical lens assembly. The optical lens assembly includes a front group closest to an object side and including a first lens having a positive refractive power and an image side surface that is concave, and a second lens having a negative refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power. Other embodiments may be provided.

First claim

The invention claimed is:

1. An optical lens assembly comprising, from an object side to an image side:
a first lens having a positive refractive power;
a second lens immediately adjacent to the first lens, having a negative refractive power;
a third lens immediately adjacent to the second lens, having a negative refractive power; and
a fourth lens immediately adjacent to the third lens, having a positive refractive power,
wherein the fourth lens is a closest lens to an image plane, and
wherein the optical lens assembly satisfies the following condition:
0≤ YL/YM< 0.4

28< FOV< 60 (Degrees),  <Condition>

where YL denotes a distance from an optical axis to a maximum sag in an image side surface of the fourth lens, YM denotes ½ of an effective diameter of the image side surface of the fourth lens, and FOV denotes a viewing angle.

2. The optical lens assembly of claim 1 , wherein the first lens and the second lens configure a front group, and the third lens and the fourth lens configure a rear group.

3. The optical lens assembly of claim 2 , wherein at least one of the third lens and the fourth lens has at least one aspherical surface, and the at least one aspherical surface has at least one inflection point.

4. The optical lens assembly of claim 3 , further comprising an intermediate group including at least one of a fifth lens, a sixth lens, and a seventh lens,
wherein the intermediate group is located between the front group and the rear group and has a negative refractive power.

5. The optical lens assembly of claim 4 , further comprising an aperture stop between the front group and the rear group.

6. The optical lens assembly of claim 2 , further comprising at least one aperture stop between the object side and the rear group.

7. The optical lens assembly of claim 2 , wherein the optical lens assembly satisfies the following condition:
0< F 1/ EFL< 10,  <Condition>

where F1 denotes a focal length of the front group, and EFL denotes a focal length of the optical lens assembly.

8. The optical lens assembly of claim 1 , wherein the optical lens assembly satisfies the following condition:
0< F 11/ EFL< 1,  <Condition>

where F11 denotes a focal length of the first lens, and EFL denotes a focal length of the optical lens assembly.

9. The optical lens assembly of claim 1 , wherein the optical lens assembly satisfies the following condition:
20< Vd 12<30,  <Condition>

where Vd12 denotes an Abbe's number of the second lens.

10. The optical lens assembly of claim 2 , further comprising an intermediate group having a negative refractive power between the front group and the rear group, wherein the intermediate group includes one or two lenses and the optical lens assembly satisfies the following condition:
−100< F 2/ EFL< 0,  <Condition>

where F2 denotes a focal length of the intermediate group, and EFL denotes a focal length of the optical lens assembly.

11. The optical lens assembly of claim 2 , wherein the optical lens assembly satisfies the following condition:
−100< F 3/ EFL< 0,  <Condition>

where F3 denotes a focal length of the rear group, and EFL denotes a focal length of the optical lens assembly.

12. The optical lens assembly of claim 2 , wherein the optical lens assembly satisfies the following condition:
−100< F 31/ EFL< 0,  <Condition>

where F31 denotes a focal length of the third lens, and EFL denotes a focal length of the optical lens assembly.

13. The optical lens assembly of claim 1 , wherein the optical lens assembly satisfies the following condition:
0.5< F 32/ EFL< 100,  <Condition>

where F32 denotes a focal length of the fourth lens, and EFL denotes a focal length of the optical lens assembly.

14. An optical lens assembly comprising, from an object side to an image side:
a first lens having a positive refractive power;
a second lens immediately adjacent to the first lens, having a negative refractive power;
a third lens immediately adjacent to the second lens, having a negative refractive power; and
a fourth lens immediately adjacent to the third lens, having a positive refractive power,
wherein the fourth lens is a closest lens to and
wherein the optical lens assembly has a viewing angle that is greater than 35° and less than 49°.

15. An electronic device comprising:
an optical lens assembly; and
an image sensor configured to receive light focused by the optical lens assembly,
wherein the optical lens assembly consists of, from an object side to an image side:
a first lens having a positive refractive power;
a second lens having a negative refractive power;
a third lens immediately adjacent to the second lens, having a negative refractive power; and
a fourth lens having a positive refractive power, wherein the optical lens assembly satisfies the following condition:
0≤ YL/YM< 0.4

28< FOV< 60 (Degrees),  <Condition>

where YL denotes a distance from an optical axis to a maximum sag in an image side surface of the fourth lens, YM denotes ½ of an effective diameter of the image side surface of the fourth lens, and FOV denotes a viewing angle.

16. The optical lens assembly of claim 1 , wherein the second lens is immediately adjacent to the first lens.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kang Byung-Kwon
• Zhao Liefeng

Classifications

• G02B27/0037

  with diffracting elements (G02B27/0056 takes precedence; holographic optical elements G02B5/32; zone systems G02B5/1876) · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• H04N23/54

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

• G02B13/0045

  having five or more lenses · CPC title

• G02B9/64

  having more than six components · CPC title