OPTICAL IMAGE CAPTURING SYSTEM AND ELECTRONIC DEVICE

• US 20180307000A1
• Filed: 08/08/2017
• Published: 10/25/2018
• Est. Priority Date: 04/21/2017
• Status: Active Grant

• Current Assignee: Ability Opto-Electronics Technology Co., Ltd.
• Original Assignee: Ability Opto-Electronics Technology Co., Ltd.
• Inventors: LAI, Chien-Hsun, CHANG, Yeong-Ming, TSAI, Chen-Hung, CHEN, Ying-Jung, LIU, Yao-Wei, YANG, Hui-Hsuan
• Granted Patent: US 10,514,523 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 13/002 having at least one aspherical surface
• CPC Class Codes: G02B 13/003 having two lenses
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/06 Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G02B 7/028 with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
• CPC Class Codes: G02B 9/04 having two components only

Abstract

An optical image capturing system and an electronic using the same are disclosed. The optical image capturing system includes at least two lenses, an image plane, and a first position element. In certain condition, the design of the optical image capturing system may simantaneously inhibit the deviation of effect focal length and improve the imagining quality in response to temperature fluctuation.

Claims

1. An optical image capturing system, comprising:

an optical imaging lens assembly comprising at least two lenses having refractive power; and

an image plane;

wherein each lens of the at least two lenses has an object-side surface, which faces an object side, and an image-side surface, which faces an image side;

wherein at least one among the at least two lenses has positive refractive power, and the optical image capturing system satisfies;

1.0≤

FST/HEP≤

10.0;

0 deg<

HAF≤

150 deg;

WT1≤

100°

C.; and

BHOS1/BHOS≥

0.9, wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST, HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly;

wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane;

wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

2. The optical image capturing system according to claim 1, wherein the first working temperature WT1 satisfies:

−

50°

C.<

WT1≤

100°

C.

3. The optical image capturing system according to claim 1, wherein the first working temperature WT1 satisfies:

−

40°

C.<

WT1≤

70°

C.

4. The optical image capturing system according to claim 1, wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at the first working temperature WT1 and a reference wavelength of d-line, and the optical image capturing system satisfies:

−

200 (10<sup>−

6</sup>/°

C.)≤

DNT1<

0(10<sup>−

6</sup>/°

C.).

5. The optical image capturing system according to claim 1, wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a second thermal refractive index coefficient DNT2 at a second working temperature WT2 and a reference wavelength of d-line, the second working temperature WT2 is lower than the first working temperature WT1, and the optical image capturing system satisfies:

ST<

WT2<

WT1; and

−

200 (10<sup>−

6</sup>/°

C.)≤

DNT2<

−

1(10<sup>−

6</sup>/°

C.).

6. The optical image capturing system according to claim 5, wherein the second working temperature WT2 satisfies:

−

40°

C.<

WT2≤

50°

C.

7. The optical image capturing system according to claim 1, wherein the optical image capturing system further satisfies:

MTFE≥

00.1;

MTFE3≥

0.01; and

MTFE7≥

0.01, wherein MTFE0, MTFE3, and MTFE7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane.

8. The optical image capturing system according to claim 1, wherein the optical image capturing system further satisfies:

0.9≤

2(ARE/HEP)≤

2.0, wherein ARE is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface.

9. The optical image capturing system according to claim 1, wherein the optical image capturing system further satisfies:

0.9≤

ARS/EHD≤

2.0, wherein EHD is the maximum effective half diameter of any surface of any one of the at least two lenses, and ARS is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface of any surface of any one of the at least two lenses.

10. The optical image capturing system according to claim 1, wherein the optical image capturing system satisfies:

1<

FWT1/FST≤

5, wherein FWT1 is a first effective focal length of the optical imaging lens assembly at the first working temperature WT1.

11. The optical image capturing system according to claim 1, wherein the optical image capturing system satisfies:

|BHOS1−

BHOS|>

0.001 mm, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; and

wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

12. The optical image capturing system according to claim 1, wherein the optical image capturing system satisfies:

0<

|BHOS1−

BHOS|/BHOS2, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, and BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; and

wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

13. An optical image capturing system, comprising:

an optical imaging lens assembly comprising at least two lenses having refractive power; and

an image plane, wherein each lens of the at least two lenses has an object-side surface, which faces an object side, and an image-side surface, which faces an image side;

a first positioning element comprising a holder and a base, and wherein the holder is in a hollow shape and non-transparent, and configured to connect the optical imaging lens assembly, and the base is disposed near the image plane and configured to shield the image plane;

wherein at least one among the at least two lenses has positive refractive power, and the optical image capturing system satisfies;

1.0≤

FST/HEP≤

10.0;

0 deg<

HAF≤

150 deg;

1 mm≤

LPE1≤

1000 mm;

1.1(10<sup>−

6</sup>/°

C.)≤

CES1≤

120(10<sup>−

6</sup>/°

C.); and

DNT1<

0 (10<sup>−

6</sup>/T), wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST, HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly;

wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at a first working temperature WT1 and a reference wavelength of d-line, and LPE1 is a length of an outer wall of the first positioning element in parallel with the optical axis at the standard temperature ST, and CES1 is a thermal expansion coefficient of the first positioning element at the standard temperature ST.

14. The optical image capturing system according to claim 13, wherein the first working temperature WT1 satisfies:

−

50°

C.<

WT1≤

100°

C.

15. The optical image capturing system according to claim 13, wherein the first working temperature WT1 satisfies:

−

40°

C.<

WT1≤

70°

C.

16. The optical image capturing system according to claim 13, wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at a first working temperature WT1 and a reference wavelength of d-line, and the optical image capturing system satisfies:

−

200 (10<sup>−

6</sup>/°

C.)≤

DNT1<

0(10<sup>−

6</sup>/°

C.).

17. The optical image capturing system according to claim 13, wherein the optical image capturing system satisfies:

0<

|BHOS1−

BHOS|/BHOS≤

10, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, and BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane;

wherein under the first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane.

18. The optical image capturing system according to claim 13, wherein the optical image capturing system satisfies:

1 mm(10<sup>−

4</sup>/°

C.)≤

α

≤

10 mm (10<sup>−

4</sup>/°

C.), where a is the product of LPE1 and CES1.

19. The optical image capturing system according to claim 17, wherein the optical image capturing system satisfies:

0<

|BHOS1−

BHOS|/α

≤

100, where a is the product of LPE1 and CES1.

20. The optical image capturing system according to claim 13, wherein the optical image capturing system further satisfies:

MTFE≥

00.1;

MTFE3≥

0.01; and

MTFE7≥

0.01, wherein MTFE0, MTFE3, and MTFE7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane.

21. The optical image capturing system according to claim 13, wherein the optical image capturing system further satisfies:

0.9≤

2(ARE/HEP)≤

2.0, wherein ARE is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface.

22. The optical image capturing system according to claim 13, wherein material of the first positioning element is selected from the group consisting of aluminum, magnesium, copper, iron, silver, gold, and alloy thereof.

23. The optical image capturing system according to claim 13, wherein material of the first positioning element is selected from the group consisting of polycarbonate, liquid crystal plastic, and a mixture thereof.

24. An optical image capturing system, comprising:

an optical imaging lens assembly comprising at least two lenses having refractive power; and

an image plane;

wherein each lens of the at least two lenses has an object-side surface, which faces an object side, and an image-side surface, which faces an image side;

wherein at least one among the at least two lenses has positive refractive power, and the optical image capturing system satisfies;

1.0≤

FST/HEP≤

10.0;

0 deg<

HAF≤

150 deg;

−

50°

C.<

WT1≤

100°

C.;

−

200 (10<sup>−

6</sup>/°

C.)≤

DNT1<

0(10<sup>−

6</sup>/°

C.) and 0<

|BHOS1−

BHOS|/BHOS≤

5, wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST, HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side and the image plane, and BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane;

wherein under a first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane; and

wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at the first working temperature WT1 and a reference wavelength of d-line.

25. The optical image capturing system according to claim 24, further comprising a first positioning element comprising a holder and a base, wherein the holder is in a hollow shape and non-transparent, and configured to connect the optical imaging lens assembly, and the base is disposed near the image plane and configured to shield the image plane;

wherein the optical image capturing system satisfies;

0<

|BHOS1−

BHOS|/α

≤

100, wherein LPE1 is a length of an outer wall of the first positioning element in parallel with the optical axis at the standard temperature ST, CES1 is a thermal expansion coefficient of the first positioning element at the standard temperature ST, and α

is the product of LPE1 and CES1.

26. An electronic device, comprising:

an optical imaging lens assembly comprising at least two lenses having refractive power;

an image plane; and

a first positioning element comprising a holder and a base, and the holder is in a hollow shape and non-transparent, and configured to connect the optical imaging lens assembly, and the base is disposed near the image plane and configured to shield the image plane;

wherein at least one among the at least two lenses has positive refractive power, and the following relationships are satisfied;

1.0≤

FST/HEP≤

10.0;

0 deg<

HAF≤

150 deg; and

−

200 (10<sup>−

6</sup>/°

C.)≤

DNT1<

0(10<sup>−

6</sup>/T), wherein FST is a standard effective focal length of the optical imaging lens assembly at a standard temperature ST;

wherein at least one among the at least two lenses of the optical imaging lens assembly is made of material which has a first thermal refractive index coefficient DNT1 at a first working temperature WT1 and a reference wavelength of d-line, and the first working temperature WT1 is higher than the standard temperature ST;

wherein HEP is an entrance pupil diameter of the optical imaging lens assembly, HAF is a half of the maximum field angle of the optical imaging lens assembly.

27. The electronic device according to claim 26, wherein the optical image capturing system further satisfies:

MTFE≥

00.1;

MTFE3≥

0.01; and

MTFE7≥

0.01, wherein MTFE0, MTFE3, and MTFE7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 55 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane.

28. The electronic device according to claim 26, wherein the first working temperature WT1 satisfies:

−

50°

C.<

WT1≤

100°

C.

29. The electronic device according to claim 26, wherein the optical image capturing system further satisfies:

0.9≤

2(ARE/HEP)≤

2.0, wherein ARE is a length of outline curve from an axial point on any surface of any one of the at least two lenses to a coordinate point of perpendicular height with a distance of a half of the entrance pupil diameter from the optical axis on the surface along an outline of the surface.

30. The electronic device according to claim 26, wherein the optical image capturing system further satisfies:

0<

|BHOS1−

BHOS|/α

≤

100, wherein under the standard temperature ST, HOS is a distance on the optical axis between the object-side surface of the lens, which is nearest to the object side, and the image plane, BHOS is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane;

wherein under the first working temperature WT1, BHOS1 is a distance on the optical axis between the image-side surface of the lens, which is nearest to the image plane, and the image plane;

wherein LPE1 is a length of an outer wall of the first positioning element in parallel with the optical axis at the standard temperature ST, and CES1 is a thermal expansion coefficient of the first positioning element at the standard temperature ST, and α

is the product of LPE1 nd CES1.