CN110850556A

CN110850556A - Optical lens assembly

Info

Publication number: CN110850556A
Application number: CN201911256348.6A
Authority: CN
Inventors: 林肖怡; 刘涵; 袁嘉华
Original assignee: Guangdong Xuye Optoelectronics Technology Co Ltd
Current assignee: Guangdong Xuye Optoelectronics Technology Co Ltd
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-02-28

Abstract

The invention discloses an optical lens assembly. The lens assembly sequentially comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a filter along an optical axis from an object side to an image side. Wherein the first, second, fourth and sixth lenses have positive refractive power; the third, fifth and seventh lenses have negative refractive power; in the seven lenses, at least one of the object side surface and the image side surface is an aspheric surface. The optical lens assembly satisfies the following relational expression: (1) TTl/f is more than 1.00 and less than 1.65; (2) -1 ≤ (CT1+ CT3)/(CT1-CT3) ≤ 15.5; (3) i f/f7 < 1.589. The optical lens assembly of the invention is of seven lens type, the surface shape structure of each lens is combined with the optimization range of optical parameters, the whole length of the optical lens assembly can be effectively shortened and the lens visual angle can be improved under the condition of maintaining high imaging quality, and the optical lens assembly has high resolution power brought by high pixels, thereby being provided for a small or thin portable device which needs to be provided with high imaging quality equipment.

Description

Optical lens assembly

The technical field is as follows:

the invention relates to the technical field of photographic lens products, in particular to an optical lens assembly.

Background art:

with the development of technology, the functions of various digital products are increasing, for example, a camera lens assembly is integrated in many digital products (e.g., various mobile terminals and mobile phones). However, with the continuous update of products, the consumer's demand for photo quality in digital products is also increasing.

In recent years, with the rapid development of miniaturized camera lenses, the demand of miniaturized image capture modules is increasing, and with the advancement of semiconductor process technology, the pixel size of the photosensitive element is reduced, and nowadays, electronic products are developed with a good function, a light weight, a small size and a light weight. Therefore, the miniaturized photographing lens with good imaging quality is apparently the mainstream in the market. Meanwhile, with the rapid development of science and technology, the application range of the camera module is increasingly diversified. As portable electronic devices become multifunctional, the requirements for the imaging quality of the camera module mounted thereon have been increased, and the volume of the camera module is also more restricted.

However, it is difficult for the prior art camera module with six lenses to meet the requirement of the current market for imaging quality, so that a camera module with seven lenses is required to meet the high standard of imaging quality required at present. However, the camera module with seven lenses does not easily limit the size of the portable electronic device. In order to meet the market demand, it is necessary to provide a miniature camera module with high imaging quality.

The invention has the following patent contents:

the invention aims to overcome the defects of the prior art and provide an optical lens assembly matched with seven lenses.

In order to solve the technical problems, the invention adopts the following technical scheme: an optical lens assembly, comprising in order along an optical axis thereof from an object side to an image side: a first lens element with positive refractive power having an object-side surface and an image-side surface which are aspheric; a second lens element having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof; a stop located on one side of the image-side surface of the second lens; a third lens element with negative refractive power having an object-side surface being convex and an image-side surface being concave at a paraxial region; a fourth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region; a fifth lens element with negative refractive power having an object-side surface being concave at a paraxial region and an image-side surface being convex at a paraxial region; a sixth lens element with positive refractive power having an object-side surface being convex at a paraxial region; a seventh lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, the image-side surface having at least one inflection point in a region away from the paraxial region thereof; the optical filter is positioned between the seventh lens and the imaging surface; the optical lens assembly satisfies the following relational expression: (1) TTl/f is more than 1.00 and less than 1.65; (2) -1 ≤ (CT1+ CT3)/(CT1-CT3) ≤ 15.5; (3) i f/f7 < 1.589.

Further, in the above technical solution, the second lens element has positive refractive power; the sixth lens element has a convex image-side surface at a paraxial region, and both the object-side surface and the image-side surface are aspheric.

Further, in the above technical solution, the lens assembly further satisfies the following conditions: (3) i R11/R12I < 1.9; (4) f/f1 is less than or equal to 0.4.

Further, in the above technical solution, the lens assembly further satisfies the following conditions: (5) f34/f < 4.20.

Further, in the above technical solution, the lens assembly further satisfies the following conditions: (6)0.8 < CT2/CT1+ CT3 < 1.7;

further, in the above technical solution, the lens assembly further satisfies the following conditions: 7)0.4 < | f/f6| + | f/f7| < 3.5;

further, in the above technical solution, the lens assembly further satisfies the following conditions: (8) -50 < (CT6+ ET6)/(CT6-ET6) is less than or equal to 5.5;

further, in the above technical solution, the lens assembly further satisfies the following conditions: (9) LCT14/LCT57 is more than or equal to 0.7 and less than or equal to 1.3.

Further, in the above technical solution, the lens assembly further satisfies the following condition (10)1.5 < V1/V3 < 3.0.

Further, in the above technical solution, the aperture value Fno of the lens assembly is smaller than 1.65.

In the above technical solution, the content of each parameter representation of the parameter in the corresponding condition is described later.

The invention aims at the current requirement of high standard imaging quality and has the characteristic of large aperture. The imaging lens is of a seven-lens type, the surface shape structure of each lens is combined with the optimal range of optical parameters, the overall length of the imaging lens can be effectively shortened and the visual angle of the imaging lens can be improved under the condition of maintaining high imaging quality, and the imaging lens has high resolution power brought by high pixels, so that the imaging lens is provided for a small or thin portable device which needs to be provided with high-imaging-quality equipment.

Compared with the current similar products matched with seven lenses, the novel lens has the following advantages: the whole volume (along the direction of the optical axis) can be further compressed, so that the requirement of a miniaturized wide-angle lens can be met, and higher imaging quality can be ensured. The invention adopts the proper optical lens structure and lens layout, so that the light rays pass through the lens more smoothly, the aberration correction is more reasonable, the imaging picture distortion is small, the definition is high, and the clear, full and rich layering of the shot picture can be ensured while the wide angle and the large aperture are considered.

Description of the drawings:

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a table of specification parameters for a lens assembly according to one embodiment of the present invention;

FIG. 3 shows aspheric coefficients of the first embodiment of the present invention;

FIG. 4 is a graph of field curvature and distortion according to the first embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 6 is a table of specification parameters of a lens module according to a second embodiment of the present invention;

FIG. 7 shows aspheric coefficients of the second embodiment of the present invention;

FIG. 8 is a graph of field curvature and distortion for a second embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 10 is a table of specification parameters for a lens assembly according to the third embodiment of the present invention;

FIG. 11 shows aspheric coefficients of the third embodiment of the present invention;

FIG. 12 is a graph of field curvature and distortion according to a third embodiment of the present invention;

FIG. 13 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 14 is a table of specification parameters of a lens module according to the fourth embodiment of the present invention;

FIG. 15 shows aspheric coefficients of the fourth embodiment of the present invention;

FIG. 16 is a graph of field curvature and distortion according to the fourth embodiment of the present invention;

the specific implementation mode is as follows:

example 1

The invention relates to a camera lens component used in digital products. As shown in fig. 1-4, this is the first embodiment of the present invention.

As shown in fig. 1, the photographic lens assembly includes, in order along an optical axis thereof from an object side 10 to an image side 11 (from left to right): the lens comprises a first lens 1, a second lens 2, a diaphragm 8, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and a filter 9.

The first lens element 1 with positive refractive power has an object-side surface and an image-side surface that are both aspheric. The object side surface of the first lens 1 adopts an inverse curved surface design, and can effectively converge off-axis rays, so that the angle of the rays incident on the photosensitive element is more consistent with the preset angle of the chip, and the aberration of an off-axis field can be further corrected.

The second lens element 2 with positive refractive power has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region.

The third lens element 3 with negative refractive power has an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region.

The fourth lens element 4 with positive refractive power has an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region.

The fifth lens element 5 with negative refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof.

The sixth lens element 6 with positive refractive power has an object-side surface being convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the sixth lens element 6 is an inverse curved surface.

The seventh lens element with negative refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, and at least one inflection point is disposed on the image-side surface thereof in a region away from the paraxial region thereof. Namely, the surface on the image side of the seventh lens element 7 is of an inverse curved surface design.

The diaphragm 8 is positioned on one side of the surface on the image side of the second lens 2.

In the present invention, in the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7, at least one of all object side surfaces and all image side surfaces of the seven lenses is aspheric. The seven lenses can be made of resin materials.

The lens assembly satisfies the following conditions:

(1)1.00＜TTl/f＜1.65；

(2)-1≤(CT1+CT3)/(CT1-CT3)≤15.5；

(3)|f/f7|＜1.589；

(4)|R11/R12|＜1.9；

(5)f/f1≤0.4；

(6)f34/f＜4.20；

(7)0.8＜CT2/CT1+CT3＜1.7；

(8)0.4＜|f/f6|+|f/f7|＜3.5；

(9)-50＜(CT6+ET6)/(CT6-ET6)≤5.5；

(10)0.7≤LCT14/LCT57≤1.3；

(11)1.5＜V1/V3＜3.0；

(12) the aperture value Fno < 1.65.

In the above condition, the related parameters are expressed as follows:

f: focal length of high-definition optical imaging lens group

TTL: the total optical length of the image pickup optical lens

CT1: center thickness of the first lens on the optical axis

CT2: center thickness of the second lens on the optical axis

CT3: center thickness of the third lens on the optical axis

f 6: focal length of sixth lens

f 7: focal length of seventh lens

R11: radius of curvature of object-side surface of first lens

R12: radius of curvature of image-side surface of first lens

f 34: combined focal length of third and fourth lens

ET6: thickness of sixth lens edge

CT6: center thickness of sixth lens

LCT14: the distance between the object side surface of the first lens and the image side surface of the fourth lens on the optical axis

LCT57: the distance between the object side surface of the fifth lens and the image side surface of the seventh lens on the optical axis

V1: abbe number of the first lens

V3: abbe number of the third lens

Fno: the aperture value of the optical lens for image capture.

The specific conditions used in this example one, based on the above conditions, are shown in table 1 below:

referring to fig. 2, this is a specification parameter table of the lens assembly in one embodiment, wherein the focal length F of the lens assembly is 3.59mm, the F-number FNO is 1.500, and the HFOV is 40.7 °

Referring to fig. 3, it is shown that the aspheric coefficients of the first embodiment of the present invention are aspheric coefficients.

See fig. 4, which shows the field curvature and distortion diagram of the first embodiment.

Example 2

Referring to fig. 5-8, this is the second embodiment of the present invention, which has the same structure as the first embodiment, except that the parameters of the lens are slightly adjusted. The lens assembly of the second embodiment satisfies the following conditions:

the specific condition values adopted in the second example are shown in table 2 below:

referring to fig. 2, this is a specification parameter table of the lens assembly in one embodiment, wherein the focal length F of the lens assembly is 5.32mm, the F-number FNO is 1.500, and the view angle HFOV is 33 °

Example 3

Referring to fig. 9-12, this is a third embodiment of the present invention, which is different from the above two embodiments in the specification parameter table of the lens, and the lens assembly of the third embodiment satisfies the following conditions:

the specific condition values adopted in the third example are shown in table 3 below:

referring to fig. 2, this is a specification parameter table of the lens assembly in one embodiment, wherein the focal length F of the lens assembly is 3.96mm, the F-number FNO is 1.500, and the HFOV is 41.4 °

Example 4

Referring to fig. 13-16, this is the fourth embodiment of the present invention, which is different from the above three embodiments in the specification parameter table of the lens, and the lens assembly of the fourth embodiment satisfies the following conditions:

the specific condition values adopted in the fourth example are shown in table 4 below:

referring to fig. 2, this is a specification parameter table of the lens assembly in one embodiment, wherein the focal length F of the lens assembly is 4.07mm, the F-number FNO is 1.500, and the view angle HFOV is 40.71 °

In summary, the present invention has the characteristic of large aperture for meeting the current requirement of high standard imaging quality. The imaging lens is of a seven-lens type, the surface shape structure of each lens is combined with the optimal range of optical parameters, the overall length of the imaging lens can be effectively shortened and the visual angle of the imaging lens can be improved under the condition of maintaining high imaging quality, and the imaging lens has high resolution power brought by high pixels, so that the imaging lens is provided for a small or thin portable device which needs to be provided with high-imaging-quality equipment.

It should be understood that the above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.

Claims

1. An optical lens assembly, characterized in that: the lens assembly comprises the following components in sequence from an object side to an image side along an optical axis of the lens assembly:

a first lens element with positive refractive power having an object-side surface and an image-side surface which are aspheric;

a second lens element having an object-side surface being convex at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof;

a stop located on one side of the image-side surface of the second lens;

a third lens element with negative refractive power having an object-side surface being convex and an image-side surface being concave at a paraxial region;

a fourth lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being convex at a paraxial region;

a fifth lens element with negative refractive power having an object-side surface being concave at a paraxial region and an image-side surface being convex at a paraxial region;

a sixth lens element with positive refractive power having an object-side surface being convex at a paraxial region;

a seventh lens element with negative refractive power having an object-side surface being concave at a paraxial region thereof and an image-side surface being concave at a paraxial region thereof, the image-side surface having at least one inflection point in a region away from the paraxial region thereof;

the optical filter is positioned between the seventh lens and the imaging surface;

the optical lens assembly satisfies the following relational expression:

(1)1.00＜TTl/f＜1.65；

(2)-1≤(CT1+CT3)/(CT1-CT3)≤15.5；

(3)|f/f7|＜1.589；

in the above condition, the related parameters are expressed as follows:

TTL is the total optical length of the lens assembly;

CT1, which is the thickness of the first lens on the optical axis;

CT3, the thickness of the third lens on the optical axis;

f: is the focal length of the lens assembly;

f 7: is the focal length of the seventh lens.

2. An optical lens assembly as defined in claim 1, wherein: the second lens element with positive refractive power; the sixth lens element has a convex image-side surface at a paraxial region, and both the object-side surface and the image-side surface are aspheric.

3. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(3)|R11/R12|＜1.9；

(4)f/f1≤0.4；

in the above condition, the related parameters are expressed as follows:

r11 is the curvature radius of the object side surface of the first lens;

r12, the radius of curvature of the image side surface of the first lens;

f 1: is the focal length of the first lens.

4. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(5)f34/f＜4.20；

in the above condition, the related parameters are expressed as follows:

f 34: is the combined focal length of the third lens and the fourth lens.

5. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(6)0.8＜CT2/CT1+CT3＜1.7；

in the above condition, the related parameters are expressed as follows:

and CT2 is the thickness of the second lens on the optical axis.

6. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(7)0.4＜|f/f6|+|f/f7|＜3.5；

in the above condition, the related parameters are expressed as follows:

f6: is the focal length of the sixth lens.

7. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(8)-50＜(CT6+ET6)/(CT6-ET6)≤5.5；

in the above condition, the related parameters are expressed as follows:

CT6, which is the thickness of the sixth lens on the optical axis;

ET6 is the thickness of the edge of the sixth lens.

8. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(9)0.7≤LCT14/LCT57≤1.3；

in the above condition, the related parameters are expressed as follows:

LCT14 distance on optical axis from object side surface of the first lens to image side surface of the fourth lens;

LCT57 distance on the optical axis from the object side surface of the fifth lens to the image side surface of the seventh lens.

9. An optical lens assembly as defined in claim 1, wherein: the lens assembly further satisfies the following conditions:

(10)1.5＜V1/V3＜3.0；

in the above condition, the related parameters are expressed as follows:

v1: the abbe number of the first lens;

v3: the abbe number of the third lens.

10. An optical lens assembly as defined in claim 1, wherein: the aperture value Fno of the lens assembly is less than 1.65.