Portable electronic device, optical imaging system, and lens assembly

Patent metadata

Field	Value
Publication number	US-12313910-B2
Application number	US-202318494802-A
Country	US
Kind code	B2
Filing date	Oct 26, 2023
Priority date	Aug 22, 2018
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed from an object side, wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region, the first lens and the second lens each have a non-circular shape when viewed in an optical axis direction, and the optical imaging system satisfies 0.62398<ZS1/ZS2<1.36318, where ZS1 is a ratio of an area of an object-side surface of the first lens to a distance from the object-side surface of the first lens to an imaging plane of an image sensor, and ZS2 is a ratio of an area of an object-side surface of the second lens to a distance from the object-side surface of the second lens to the imaging plane of the image sensor.

First claim

What is claimed is:

1. An optical imaging system comprising:
a first lens having positive refractive power;
a second lens having negative refractive power;
a third lens having refractive power;
a fourth lens having refractive power; and
a fifth lens having refractive power, sequentially disposed from an object side,
wherein the first to fifth lenses are spaced apart from each other by predetermined distances along an optical axis in a paraxial region,
wherein the optical imaging system satisfies 1.607 mm<ZS1<2.014 mm, where ZS1 is a ratio of an area of an object-side surface of the first lens to a distance on the optical axis from the object-side surface of the first lens to an imaging plane of an image sensor, and
wherein the optical imaging system satisfies f/IMG HT>4.9, where f is a total focal length of the optical imaging system, and IMG HT is one-half of a diagonal length of the imaging plane of the image sensor.

2. The optical imaging system according to claim 1 , wherein a length of the first lens in a first axial direction perpendicular to the optical axis is longer than a length of the first lens in a second axial direction perpendicular to both the optical axis and the first axial direction.

3. The optical imaging system according to claim 1 , wherein the optical imaging system satisfies 0.62398<ZS1/ZS2<1.36318, where ZS2 is a ratio of an area of an object-side surface of the second lens to a distance on the optical axis from the object-side surface of the second lens to the imaging plane of the image sensor.

4. The optical imaging system according to claim 1 , wherein a length of the second lens in a first axial direction perpendicular to the optical axis is longer than a length of the second lens in a second axial direction perpendicular to both the optical axis and the first axial direction, and
the optical imaging system satisfies 1.838 mm<ZS2<2.303 mm.

5. The optical imaging system according to claim 1 , wherein the first lens comprises a first side surface and a second side surface, each comprising an arc shape when viewed in an optical axis direction, and a third side surface and a fourth side surface connecting the first side surface and the second side surface.

6. The optical imaging system according to claim 5 , wherein the optical imaging system further satisfies 73.9 degrees<α<106.4 degrees, where α is an angle between a first imaginary line connecting the optical axis and a connection point between the first side surface and the fourth side surface and a second imaginary line connecting the optical axis and a connection point between the second side surface and the fourth side surface.

7. The optical imaging system according to claim 5 , wherein the optical imaging system further satisfies 0.599<AR<0.799, where a line segment connecting the third side surface and the fourth side surface through the optical axis in a shortest distance represents a minor axis, a line segment connecting the first side surface and the second side surface through the optical axis and perpendicular to the minor axis represents a major axis, and AR is a ratio of a length of the minor axis to a length of the major axis.

8. The optical imaging system according to claim 1 , wherein the first lens and the second lens each comprise an optical portion for refracting light and a flange portion extending along a periphery of at least a portion of the optical portion,
wherein the optical imaging system satisfies 0.73598<ZS'1/ZS'2<1.37987, where ZS'1 is a ratio of an area of the optical portion on an object-side surface of the first lens to a distance on the optical axis from the object-side surface of the first lens to an imaging plane of the image sensor, and ZS'2 is a ratio of an area of the optical portion on an object-side surface of the second lens to a distance on the optical axis from the object-side surface of the second lens to the imaging plane of the image sensor.

9. The optical imaging system according to claim 8 , wherein the optical imaging system further satisfies 1.218 mm<ZS'1<1.477 mm.

10. The optical imaging system according to claim 8 , wherein a length of the optical portion of the first lens in a first axial direction perpendicular to the optical axis is longer than a length of the optical portion of the first lens in a second axial direction perpendicular to both the optical axis and the first axial direction,
a length of the optical portion of the second lens in the first axial direction is longer than a length of the optical portion of the second lens in the second axial direction, and
wherein the optical imaging system satisfies 1.221 mm<ZS'2<1.404 mm.

11. The optical imaging system according to claim 10 ,
wherein the optical portion of the second lens comprises a first edge and a second edge, each comprising an arc shape when viewed in an optical axis direction, and a third edge and a fourth edge connecting the first edge and the second edge.

12. The optical imaging system according to claim 11 , wherein the optical imaging system further satisfies 34.7 degrees<α′2<82 degrees, where α′2 is an angle between a first imaginary line connecting the optical axis and a connection point between the first edge and the fourth edge and a second imaginary line connecting the optical axis and a connection point between the second edge and the fourth edge.

13. The optical imaging system according to claim 11 , wherein the optical imaging system further satisfies 0.755<AR'2<0.955, where a line segment connecting the third edge and the fourth edge through the optical axis in a shortest distance represents a minor axis, a line segment connecting the first edge and the second edge through the optical axis and perpendicular to the minor axis represents a major axis, and AR′2 is a ratio of a length of the minor axis to a length of the major axis.

14. The optical imaging system according to claim 1 , wherein the optical imaging system satisfies ER11/ER_max>1.1, where ER11 is an effective radius of the object-side surface of the first lens, and ER_max is a maximum value among effective radius of an object-side surface and effective radius of an image-side surface of the lenses, except for the first lens and the second lens.

15. The optical imaging system according to claim 1 , wherein the optical imaging system satisfies ER11/ER51>1.1, where ER11 is an effective radius of the object-side surface of the first lens, and ER51 is an effective radius of an object-side surface of the fifth lens.

16. The optical imaging system according to claim 1 , wherein a length of the second lens in a first axial direction perpendicular to the optical axis is longer than a length of the second lens in a second axial direction perpendicular to both the optical axis and the first axial direction, and
wherein the optical imaging system satisfies ER21/ER_max>1.0, where ER21 is an effective radius of an object-side surface of the second lens, and ER_max is a maximum value among effective radius of an object-side surface and effective radius of an image-side surface of the lenses, except for the first lens and the second lens.

17. The optical imaging system according to claim 1 , wherein a length of the second lens in a first axial direction perpendicular to the optical axis is longer than a length of the second lens in a second axial direction perpendicular to both the optical axis and the first axial direction, and
wherein the optical imaging system satisfies ER21/ER51>1.0, where ER21 is an effective radius of an object-side surface of the second lens, and ER51 is an effective radius of an object-s

Assignees

• Samsung Electro Mech

Inventors

• Jeong Dae Hyun
• Yoo Ho Sik
• Lee Jong In
• Kim Jong Ki

Classifications

• 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

• G02B7/021

  for more than one lens · CPC title

• G02B13/18

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

• G02B9/60

  having five components only · CPC title