OPTICAL IMAGE CAPTURING MODULE

• US 20200096738A1
• Filed: 12/20/2018
• Published: 03/26/2020
• Est. Priority Date: 09/21/2018
• Status: Active Grant

• Current Assignee: Ability Opto-Electronics Technology Co., Ltd.
• Original Assignee: Ability Opto-Electronics Technology Co., Ltd.
• Inventors: CHANG, YEONG-MING, LAI, CHIEN-HSUN, LIU, YAO-WEI
• Granted Patent: US 10,642,003 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• CPC Class Codes: G02B 13/0045 having five or more lenses
• CPC Class Codes: G02B 13/008 designed for infrared light
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 7/021 for more than one lens
• CPC Class Codes: G02B 9/62 having six components only
• CPC Class Codes: H04N 23/50 Constructional details
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

An optical image capturing module includes a lens assembly and a circuit assembly. The circuit substrate has a through hole. A lower surface of the circuit substrate has multiple circuit contacts. A sensing surface of an image sensing component has multiple image contacts. Each image contact is electrically connected to one of the circuit contacts via a signal transmission element, thereby the sensing surface directly faces the through hole. The lens base made of an opaque material has a receiving hole. The lens assembly includes a lens base disposed on an upper surface of the circuit substrate and a lens group, thereby the sensing surface directly faces the receiving hole via the through hole. The image sensing component is located in the receiving hole. The lens group includes at least two lenses having refractive power, and is disposed on the lens base and is located in the receiving hole.

Claims

1. An optical image capturing module, comprising:

a circuit assembly, which comprises a circuit substrate and an image sensing component, wherein the circuit substrate has an upper surface and a lower surface, which are located on opposite side, and has a through hole penetrating through the upper surface and the lower surface;

the lower surface of the circuit substrate has a plurality of circuit contacts thereon;

the image sensing component has a sensing surface, wherein a surface of the image sensing component has a plurality of image contacts on the same side with the sensing surface;

each of the image contacts is electrically connected to one of the circuit contacts on the circuit substrate via a signal transmission element, so that the sensing surface directly faces the through hole; and

a lens assembly, which comprises a lens base and a lens group, wherein the lens base is made of an opaque material and has a receiving hole penetrating through two ends of the lens base, so that the lens base is hollow;

in addition, the lens base is disposed on the upper surface of the circuit substrate, so that the image sensing component directly faces the receiving hole;

the lens group comprises at least two lenses having refractive power, and is disposed on the lens base and is located in the receiving hole;

moreover, an image plane of the lens group is located on the sensing surface, and an optical axis of the lens group overlaps with a central normal of the sensing surface, so that a light passes through the lens group in the receiving hole and the through hole, and projects onto the sensing surface;

wherein the optical image capturing module satisfies;

1.0≤

f/HEP≤

10.0;

0 deg<

HAF≤

150 deg;

0 mm<

PhiD≤

18 mm;

0<

PhiA/PhiD≤

0.99; and

0.9≤

2(ARE/HEP)≤

2.0;

where f is a focal length of the lens group;

HEP is an entrance pupil diameter of the lens group;

HAF is a half of a maximum field angle of the lens group;

PhiD is a maximum value of a minimum length on a periphery of the lens base perpendicular to the optical axis of the lens group;

PhiA is a maximum effective diameter of an image-side surface of the at least two lenses of the lens group closest to the image plane;

ARE is a profile curve length measured from a start point where the optical axis of the lens group passes through any surface of one of the at least two lenses, along a surface profile of the corresponding lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis.

2. The optical image capturing module of claim 1, wherein the optical image capturing module further satisfies:

0.9≤

ARS/ERD≤

2.0;

where for any surface of any lens, ARS is a profile curve length measured from a start point where the optical axis passes therethrough, along a surface profile thereof, and finally to an end point of the maximum effective half diameter thereof;

MD is a maximum effective half diameter thereof.

3. The optical image capturing module of claim 1, wherein the optical image capturing module further satisfies:

PLTA≤

100 μ

m;

PSTA≤

100 μ

m;

NLTA≤

100 μ

m;

NSTA≤

100 μ

m;

SLTA≤

100 μ

m;

SSTA≤

100 μ

m; and

|TDT|<

250%

where HOI is a maximum height for image formation perpendicular to the optical axis on the image plane;

PLTA is a transverse aberration at 0.7 HOI in a positive direction of a tangential ray fan aberration after the longest operation wavelength passing through an edge of the entrance pupil;

PSTA is a transverse aberration at 0.7 HOI in the positive direction of the tangential ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil;

NLTA is a transverse aberration at 0.7 HOI in a negative direction of the tangential ray fan aberration after the longest operation wavelength passing through the edge of the entrance pupil;

NSTA is a transverse aberration at 0.7 HOI in the negative direction of the tangential ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil;

SLTA is a transverse aberration at 0.7 HOI of a sagittal ray fan aberration after the longest operation wavelength passing through the edge of the entrance pupil;

SSTA is a transverse aberration at 0.7 HOI of the sagittal ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil;

TDT is a TV distortion for image formation in the optical image capturing module.

4. The optical image capturing module of claim 1, wherein the lens group comprises four lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, and a fourth lens in order along an optical axis from an object side to an image side;

the lens group satisfies;

0.1≤

InTL/HOS≤

0.95;

where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane;

InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the fourth lens.

5. The optical image capturing module of claim 1, wherein the lens group comprises five lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order along an optical axis from an object side to an image side;

the lens group satisfies;

0.1≤

InTL/HOS≤

0.95;

where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane;

InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the fifth lens.

6. The optical image capturing module of claim 1, wherein the lens group comprises six lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a six lens in order along an optical axis from an object side to an image side;

the lens group satisfies;

0.1≤

InTL/HOS≤

0.95;

where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane;

InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the sixth lens.

7. The optical image capturing module of claim 1, wherein the lens group comprises seven lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order along an optical axis from an object side to an image side;

the lens group satisfies;

0.1≤

InTL/HOS≤

0.95;

where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane;

InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the seventh lens.

8. The optical image capturing module of claim 1, wherein the optical image capturing module further satisfies:

MTFQ0≥

0.2;

MTFQ3≥

0.01; and

MTFQ7≥

0.01;

where HOI is a maximum height for image formation perpendicular to the optical axis on the image plane;

MTFQ0, MTFQ3, and MTFQ7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 110 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOI on an image plane for visible light.

9. The optical image capturing module of claim 1, further comprising an aperture, wherein the optical image capturing module further satisfies:

0.2≤

InS/HOS≤

1.1;

where InS is a distance on the optical axis between the aperture and the image plane;

HOS is a distance in parallel with the optical axis between an object-side surface of one of the at least two lenses of the lens group furthest from the image plane and the image plane.

10. The optical image capturing module of claim 1, wherein the lens base further comprises a lens barrel and a lens holder;

the lens holder is fixed on the circuit substrate and has a lower through hole penetrating through two ends of the lens holder;

the lens barrel is disposed in the lens holder and is located in the lower through hole, and has an upper through hole penetrating through two ends of the lens barrel, so that the upper through hole communicates with the lower through hole to form the receiving hole;

the upper through hole of the lens barrel directly faces the sensing surface of the image sensing component;

in addition, the lens group is disposed in the lens barrel to be located in the upper through hole;

PhiD is a maximum value of a minimum length on a periphery of the lens holder perpendicular to an optical axis of the lens group.

11. The optical image capturing module of claim 10, wherein the optical image capturing module further satisfies:

0 mm<

TH1+TH2≤

1.5 mm;

where TH1 is a maximum thickness of the lens holder;

TH2 is a minimum thickness of the lens barrel.

12. The optical image capturing module of claim 10, wherein the optical image capturing module further satisfies:

0<

(TH1+TH2)/HOI≤

0.95;

where TH1 is a maximum thickness of the lens holder;

TH2 is a minimum thickness of the lens barrel;

HOI is a maximum height for image formation perpendicular to the optical axis on the image plane.

13. The optical image capturing module of claim 10, wherein an outer peripheral wall of the lens barrel has an external thread thereon, and an inner wall of the lower through hole has an inner thread thereon, wherein the inner thread is screwed with the external thread, so that the lens barrel is disposed in the lens holder to be fixed in the lower through hole.

14. The optical image capturing module of claim 10, wherein a glue is coated between the lens barrel and the lens holder, and the lens barrel and the lens holder are fixed to each other via the glue, so that the lens barrel is disposed in the lens holder and is fixed in the lower through hole.

15. The optical image capturing module of claim 1, wherein the lens base is integrally formed as a monolithic unit.

16. The optical image capturing module of claim 1, wherein the optical image capturing module further comprises an IR-cut filter which is disposed on the circuit substrate and covers the through hole to be located above the image sensing component.

17. The optical image capturing module of claim 1, wherein the circuit assembly further comprises a bracket having a recess;

a portion of the bracket around an opening of the recess is connected to the lower surface of the circuit substrate;

the image sensing component is located in the recess.

18. The optical image capturing module of claim 1, wherein each of the signal transmission elements is a solder ball, a projection, a pin, or a group of their constituents.

19. The optical image capturing module of claim 1, wherein the optical image capturing module is applied to one of a group consisting of an electronic portable device, an electronic wearable device, an electronic monitoring device, an electronic information device, an electronic communication device, a machine vision device, and a vehicle electronic device.