CN112987261B

CN112987261B - Optical lens

Info

Publication number: CN112987261B
Application number: CN202110403107.0A
Authority: CN
Inventors: 王义龙; 刘绪明; 曾昊杰; 徐文; 曾吉勇
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-08-24
Anticipated expiration: 2041-04-15
Also published as: CN112987261A

Abstract

The invention provides an optical lens, which sequentially comprises the following components from an object side surface to an imaging surface: a first lens element having a negative optical power, at a paraxial region, both an object-side surface and an image-side surface of which are concave; a second lens having a positive optical power; a diaphragm; a third lens element having a positive optical power and a convex image-side surface at a paraxial region; a fourth lens element having a positive optical power, wherein at a paraxial region, both the object-side surface and the image-side surface are convex; a fifth lens having a negative optical power; a sixth lens element with negative optical power having a concave image-side surface at the paraxial region. Wherein the FOV of the optical lens is > 150 °; the distance TTL from the object side surface of the first lens of the optical lens to the image surface is less than 5.8 mm.

Description

Optical lens

Technical Field

The invention relates to the technical field of lens imaging, in particular to an optical lens.

Background

At present, with the increasing quality of life of the people, products of electronic consumption class are more and more sought after, and portable electronic devices (such as smart phones, tablet computers and the like) naturally become the primary consideration targets of consumers. Due to the rise of live broadcast software, social contact software and video software, consumers increasingly pay more attention to the effects of photographing and shooting, so that the mobile phone camera lens becomes one of the indexes which are considered first when the consumers purchase electronic equipment.

With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also developing in the directions of ultra-thinning, ultra-high definition imaging, imaging diversification and the like, which puts higher demands on the camera lenses mounted on the portable electronic devices. In recent years, along with the increasingly favorite of consumers for shooting, the requirements of a shooting lens on portable electronic equipment are higher and higher, and certain consideration is given to the imaging and imaging effects in different scenes while high-pixel and high-definition imaging is pursued; meanwhile, under the trend that portable electronic equipment is increasingly light and thin, the total length of the camera lens is greatly required, and the common camera lens is difficult to meet the requirements of consumers.

Disclosure of Invention

Accordingly, an object of the present invention is to provide an optical lens, which has at least advantages of super wide angle, short optical length, high resolution, and high pixel to meet the requirement of consumer for image capture.

The invention provides an optical lens, which sequentially comprises the following components from an object side surface to an imaging surface along an optical axis: a first lens element having a negative optical power, at a paraxial region, both an object-side surface and an image-side surface of which are concave; a second lens having a positive optical power; a diaphragm; a third lens element having a positive optical power and a convex image-side surface at a paraxial region; a fourth lens element having a positive optical power, wherein at a paraxial region, both the object-side surface and the image-side surface are convex; a fifth lens having a negative optical power; a sixth lens element with negative optical power having a concave image-side surface at the paraxial region. Wherein the FOV of the optical lens is > 150 °; the distance TTL from the object side surface of the first lens of the optical lens to the image surface is less than 5.8 mm.

The optical lens satisfies 0.4 < (CT 1+ CT 2)/(ET 1+ ET2) < 1.2, CT1 and CT2 respectively represent central thicknesses of the first and second lenses in the optical lens, and ET1 and ET2 respectively represent edge thicknesses of the first and second lenses in the optical lens.

Specifically, by limiting the range of (CT 1+ CT 2)/(ET 1+ ET2), the aberration of the optical lens is corrected, the imaging resolution is improved, and the optical lens is compact in structure and meets the miniaturization characteristic.

The optical lens satisfies 0.5 < f34/f36 < 1.1, where f34 denotes an effective focal length of third to fourth lenses in the optical lens, and f36 denotes an effective focal length of third to sixth lenses in the optical lens.

Specifically, by limiting the range of f34/f36, the third lens and the fourth lens can converge light in a system of the third lens to the sixth lens, and bear a specific optical power effect, so that the lens volume can be effectively reduced, and the imaging area can be increased.

The optical lens satisfies-6.2 < f12/f < -1.2, wherein f12 is the combined focal length of the first lens and the second lens, and f is the focal length of the optical lens.

Specifically, by limiting the range of f12/f, the aberration and distortion of the optical lens can be eliminated, and the back focal length of the optical lens can be suppressed, and the lens volume can be effectively reduced.

The optical lens satisfies 1.1 < | f45|/f < 2.6, wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is a focal length of the optical lens.

Specifically, by limiting the range of | f45|/f, the aberration generated when the light passes through the first lens to the third lens can be corrected, and the system resolving power is improved.

The optical lens meets 0.03 < SAG51/R51+ SAG52/R52< 0.45, wherein SAG51 and SAG52 respectively represent an object side rise and an image side rise of a fifth lens in the optical lens, and R51 and R52 respectively represent an object side curvature radius and an image side curvature radius of the fifth lens in the optical lens.

Specifically, by limiting the range of SAG51/R51+ SAG52/R52, the spherical aberration of the system can be effectively eliminated, the matching of the main ray angle CRA of the system is ensured, and a high-definition image is obtained.

The optical lens satisfies-2.5 < (CT 5-ET 5)/CT 5< 0, wherein CT5 represents a center thickness of a fifth lens of the optical lens, and ET5 represents an edge thickness of the fifth lens of the optical lens.

Specifically, by defining the range of (CT 5-ET 5)/CT 5, the fifth lens can be made to provide negative power, thereby playing a role in diverging light, reducing the power which is too strong, helping to correct the aberration of the peripheral field of view and improving the resolution thereof.

The optical lens satisfies 2< f3/f < 3, wherein f3 represents an effective focal length of a third lens of the optical lens, and f represents the effective focal length of the optical lens.

Specifically, by limiting the range of f3/f, the third lens can have larger positive focal power, which is beneficial to shortening the total length of the lens and meeting the market trend of thinning the portable electronic equipment.

The optical lens satisfies-2 < (SAG 62-SAG 61)/SAG62< 0.5, wherein SAG61 represents the object side sagittal height of the sixth lens in the optical lens, and SAG62 represents the image side sagittal height of the sixth lens in the optical lens.

Specifically, by limiting the range of (SAG 62-SAG 61)/SAG62, the surface shape of the sixth lens element can be effectively adjusted to adjust the aberration of the peripheral light rays, which is helpful for increasing the area of the image plane and the peripheral illumination, thereby effectively improving the imaging quality of the lens.

The optical lens satisfies-5.5 < (f 4+ f5+ f6)/f < -3, wherein f4, f5 and f6 respectively represent effective focal lengths of a fourth lens, a fifth lens and a sixth lens in the optical lens, and f represents the effective focal length of the optical lens.

Specifically, by limiting the range of (f 4+ f5+ f6)/f, the fourth lens, the fifth lens and the sixth lens can reasonably distribute the optical power in the whole optical lens, slow down the trend of ray turning, reduce the correction of higher-order aberration and reduce the difficulty of the correction of the whole lens aberration.

Compared with the prior art, the optical lens provided by the invention adopts six lenses with specific refractive power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while high pixel is met, the miniaturization of the lens and the balance of high pixels are better realized, meanwhile, the depth of field is longer, the clear imaging of scenes in front of and behind a shot main body can be ensured, the range of the shot scenes is wider, and great convenience is brought to later-stage cutting. In addition, the optical lens of the invention also enhances the spatial depth of the photographic picture, so that the imaging effect is more obvious.

Drawings

FIG. 1 is a schematic structural diagram of an optical lens system according to a first embodiment of the present invention;

FIG. 2 is a field curvature graph of an optical lens according to a first embodiment of the present invention;

FIG. 3 is a diagram illustrating a distortion curve of an optical lens according to a first embodiment of the present invention;

FIG. 4 is a graph of on-axis spherical aberration of an optical lens according to a first embodiment of the present invention;

FIG. 5 is a lateral chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;

FIG. 7 is a field curvature graph of an optical lens according to a second embodiment of the present invention;

FIG. 8 is a distortion graph of an optical lens in a second embodiment of the present invention;

FIG. 9 is a graph of on-axis spherical aberration of an optical lens according to a second embodiment of the present invention;

FIG. 10 is a lateral chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;

FIG. 11 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;

FIG. 12 is a field curvature graph of an optical lens according to a third embodiment of the present invention;

fig. 13 is a distortion graph of an optical lens in a third embodiment of the present invention;

FIG. 14 is a graph of on-axis spherical aberration of an optical lens according to a third embodiment of the present invention;

FIG. 15 is a lateral chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;

FIG. 16 is a schematic structural diagram of an optical lens system according to a fourth embodiment of the present invention;

fig. 17 is a field curvature graph of an optical lens in a fourth embodiment of the present invention;

fig. 18 is a distortion graph of an optical lens in a fourth embodiment of the present invention;

FIG. 19 is a graph showing an on-axis spherical aberration of an optical lens according to a fourth embodiment of the present invention;

fig. 20 is a lateral chromatic aberration diagram of an optical lens in a fourth embodiment of the present invention.

Description of the main element symbols:

the following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

For a better understanding of the present invention, reference will now be made to the following more complete description thereof taken in conjunction with the accompanying drawings. Several embodiments of the invention are presented in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention provides an optical lens, which sequentially comprises the following components from an object side surface to an imaging surface along an optical axis: a first lens element having a negative optical power, at a paraxial region, both an object-side surface and an image-side surface of which are concave; a second lens having a positive optical power; a diaphragm; a third lens element having a positive optical power and a convex image-side surface at a paraxial region; a fourth lens element having a positive optical power, wherein at a paraxial region, both the object-side surface and the image-side surface are convex; a fifth lens having a negative optical power; a sixth lens element with negative optical power having a concave image-side surface at the paraxial region. Wherein the FOV of the optical lens is > 150 °; the total optical length TTL of the optical lens is less than 5.8 mm.

The FOV of a conventional lens of an optical lens commonly applied to a mobile phone in the market is 40-60 degrees, the conventional ultra-wide-angle high-pixel lens is only used for a high-end flagship at present, and the market prospect is still good. The FOV of the optical lens provided by the invention is more than 150 degrees, and meanwhile, the optical lens has a short optical total length and good resolving power, and can ensure the lightness and thinness of the mobile phone body on the premise of meeting the camera shooting function of consumers.

In some embodiments, the optical lens satisfies the following conditional expression:

0.4 <（CT1+CT2）/(ET1+ET2) < 1.2 ；

wherein CT1 and CT2 represent center thicknesses of the first lens and the second lens in the optical lens, respectively, and ET1 and ET2 represent edge thicknesses of the first lens and the second lens in the optical lens, respectively. In the conditional expression range, the first lens and the second lens mainly play a role of diverging light rays in the whole optical lens, so that the field angle of the optical lens can be effectively improved.

0.5 <f34/f36 < 1.1 ；

where f34 denotes effective focal lengths of third to fourth lenses in the optical lens, and f36 denotes effective focal lengths of third to sixth lenses in the optical lens. In the conditional expression range, the third lens and the fourth lens can converge light in a system from the third lens to the sixth lens, and bear the specific focal power, so that the lens volume can be effectively reduced, and the imaging area can be increased.

-6.2＜f12/f＜-1.2；

wherein f12 is a combined focal length of the first lens and the second lens, and f is a focal length of the optical lens. In the conditional expression range, the aberration and distortion of the optical lens can be eliminated, the back focal length of the optical lens can be suppressed, and the lens volume can be effectively reduced.

1.1＜|f45|/f＜2.6；

wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is a focal length of the optical lens. By adopting the arrangement of the fourth lens element with positive refractive power and the fifth lens element with negative refractive power, the aberration generated when light passes through the first lens element and the third lens element can be corrected, and the system resolving power can be improved.

0.03 <SAG51/R51+SAG52/R52< 0.45 ；

wherein SAG51 and SAG52 denote an object-side sagittal height and an image-side sagittal height, respectively, of a fifth lens in the optical lens, and R51 and R52 denote an object-side curvature radius and an image-side curvature radius, respectively, of the fifth lens in the optical lens. In the conditional expression range, the system spherical aberration can be effectively eliminated, the matching of the main ray angle CRA of the system is ensured, and a high-definition image is obtained.

-2.5<（CT5-ET5）/CT5< 0；

wherein CT5 represents a center thickness of a fifth lens in the optical lens, and ET5 represents an edge thickness of the fifth lens in the optical lens. In the conditional expression range, the fifth lens can provide negative focal power, so that the fifth lens has a divergence effect on light, reduces the over-strong focal power, is beneficial to correcting the aberration of the peripheral field of view and improves the resolution power of the peripheral field of view.

2 <f3/f < 3；

wherein f3 represents the effective focal length of the third lens in the optical lens, and f represents the effective focal length of the optical lens. In the conditional expression range, the third lens has larger positive focal power, which is beneficial to shortening the total length of the lens and meeting the market trend of lightening and thinning the portable electronic equipment.

-2<(SAG62- SAG61)/SAG62< 0.5；

SAG61 represents the object side SAGs of the sixth lens in the optical lens, and SAG62 represents the image side SAGs of the sixth lens in the optical lens. In the conditional expression range, the surface type of the sixth lens element can be effectively adjusted to adjust the aberration of the peripheral light, which is helpful for increasing the area of the imaging surface and the peripheral illumination, thereby effectively improving the imaging quality of the lens.

-5.5<( f4+f5+f6)/f< -3；

wherein f4, f5 and f6 respectively represent effective focal lengths of a fourth lens, a fifth lens and a sixth lens of the optical lens, and f represents an effective focal length of the optical lens. In the conditional range, the fourth lens, the fifth lens and the sixth lens can reasonably distribute focal power in the whole optical lens, the trend of ray turning is slowed down, the correction of high-grade aberration is reduced, and the difficulty of the aberration correction of the whole lens is reduced.

In some embodiments, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are all plastic aspheric lenses. Each lens adopts an aspheric lens, and the aspheric lens at least has the following three advantages:

1. the lens has better imaging quality;

2. the structure of the lens is more compact;

3. the total optical length of the lens is shorter.

The surface shape of the aspheric lens in each embodiment of the invention satisfies the following equation:

，

wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction, c is the paraxial curvature radius of the surface, k is the quadric coefficient, A_2iIs the aspheric surface type coefficient of 2i order.

In the following embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables of the embodiments.

First embodiment

Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention includes, in order from an object side to an image side along a paraxial direction: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens element L1 is a plastic aspheric lens with negative power, the object-side surface S1 of the first lens element being concave at the paraxial region and the image-side surface S2 of the first lens element being concave at the paraxial region;

the second lens element L2 is a plastic aspheric lens with positive power, the object-side surface S3 of the second lens element being convex at the paraxial region and the image-side surface S4 of the second lens element being concave at the paraxial region;

the third lens element L3 is a plastic aspheric lens with positive power, the object-side surface S5 of the third lens element is convex at the paraxial region, and the image-side surface S6 of the third lens element is convex at the paraxial region;

the fourth lens element L4 is a plastic aspheric lens with positive power, the object-side surface S7 of the fourth lens element is convex at the paraxial region, and the image-side surface S8 of the fourth lens element is convex at the paraxial region;

the fifth lens element L5 is a plastic aspheric lens with negative power, the fifth lens element having an object-side surface S9 that is concave at the paraxial region and an image-side surface S10 that is concave at the paraxial region;

the sixth lens element L6 is a plastic aspheric lens with negative power, and has a concave object-side surface S11 at the paraxial region and a concave image-side surface S12 at the paraxial region.

In the present embodiment, FOV of optical lens 100 =157.4 °; the distance TTL between the object side surface of the first lens of the optical lens and the image surface is =5.79 mm.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 may all be glass lenses, or may be a combination of plastic lenses and glass lenses.

The relevant parameters of each lens in the optical lens 100 provided in this embodiment are shown in table 1, where R represents a curvature radius, d represents an optical surface distance, and n represents_dD-line refractive index, V, of the material_dRepresents the abbe number of the material.

TABLE 1

The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.

TABLE 2

In the present embodiment, the graphs of the curvature of field, distortion, on-axis spherical aberration and lateral chromatic aberration of the optical lens 100 are shown in fig. 2, fig. 3, fig. 4 and fig. 5, respectively, and it can be seen from fig. 2 to fig. 5 that the curvature of field is less than or equal to 0.3mm, which is better optimized by the design; the maximum distortion f-tan theta of the ultra-wide-angle lens only reaches 70%, and compared with the distortion f-tan theta of the common ultra-wide-angle lens which can reach 100%, the distortion is better optimized through the design; while the chromatic aberration is also well corrected.

Second embodiment

Referring to fig. 6, the structure of the optical lens 200 of the present embodiment differs greatly from the structure of the optical lens 100 of the first embodiment in that the thicknesses of the second lens L2 and the fifth lens L5, and the concave-convex variations of the second lens L2, the fifth lens L5, and the sixth lens L6 are obvious. The optical lens 200 sequentially comprises, from the object side to the image side along the paraxial direction: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

the second lens element L2 is a plastic aspheric lens with positive power, the object-side surface S3 of the second lens element is convex at the paraxial region, and the image-side surface S4 of the second lens element is convex at the paraxial region;

the fifth lens element L5 is a plastic aspheric lens with negative power, the object-side surface S9 of the fifth lens element is concave at the paraxial region, and the image-side surface S10 of the fifth lens element is convex at the paraxial region;

the sixth lens element L6 is a plastic aspheric lens with negative power, and has a convex object-side surface S11 and a concave image-side surface S12 at a paraxial region.

In the present embodiment, the FOV of the optical lens 200 =157.4 °; the distance TTL between the object side surface of the first lens of the optical lens and the image surface is =5.41 mm.

In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may all be glass lenses, or may be a combination of plastic lenses and glass lenses.

The present embodiment provides the relevant parameters of each lens in the optical lens 200 as shown in table 3.

TABLE 3

The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.

TABLE 4

In the present embodiment, the graphs of the field curvature, distortion, on-axis point spherical aberration and lateral chromatic aberration of the optical lens 200 are shown in fig. 7, fig. 8, fig. 9 and fig. 10, respectively, and it can be seen from fig. 7 to fig. 10 that the field curvature is less than 0.05mm, which is better optimized by the design; the maximum distortion f-tan theta of the ultra-wide-angle lens only reaches 70%, and compared with the distortion f-tan theta of the common ultra-wide-angle lens which can reach 100%, the distortion is better optimized through the design; while the chromatic aberration is also well corrected.

Third embodiment

Referring to fig. 11, a schematic structural diagram of an optical lens 300 provided in the present embodiment mainly differs from the structure of the optical lens 300 in the first embodiment in that: the radii of curvature of the object-side surface and the image-side surface of the first lens are different, and variations in the convexoconcave of the second lens L2, the fifth lens L5, and the sixth lens L6 are significant. The optical lens 300 sequentially includes, from the object side to the image side along the paraxial region: a first lens L1, a second lens L2, a stop, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

the second lens element L2 is a plastic aspheric lens with positive power, the object-side surface S3 of the second lens element being concave at the paraxial region and the image-side surface S4 of the second lens element being concave at the paraxial region;

the fifth lens element L5 is a plastic aspheric lens with negative power, the object-side surface S9 of the fifth lens element is convex at the paraxial region, and the image-side surface S10 of the fifth lens element is concave at the paraxial region;

In the present embodiment, FOV of optical lens 300 =157.4 °; the distance TTL between the object side surface of the first lens of the optical lens and the image surface is =5.79 mm.

The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5.

TABLE 5

The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.

TABLE 6

In the present embodiment, the graphs of field curvature, distortion, on-axis spherical aberration and lateral chromatic aberration of the optical lens 300 are shown in fig. 12, 13, 14 and 15, respectively, and as can be seen from fig. 12 to 15, the field curvature is less than 0.1mm, which is better optimized by the design; the maximum distortion f-tan theta of the ultra-wide-angle lens only reaches 70%, and compared with the distortion f-tan theta of a common ultra-wide-angle lens which can reach 100%, the distortion is better optimized through the design; while the chromatic aberration is also well corrected.

Fourth embodiment

Referring to fig. 16, the optical lens 400 of the present embodiment has a structure substantially the same as that of the optical lens 100 of the first embodiment, and the largest difference is that the thickness of the fifth lens element varies significantly, and the concave-convex variations of the second lens element L2, the third lens element L3, the fifth lens element L5 and the sixth lens element L6 are more significant. The optical lens 400 sequentially includes, from the object side to the image side along the paraxial region: a first lens L1, a second lens L2, a stop, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

the third lens element L3 is a plastic aspheric lens with positive power, the object-side surface S5 of the third lens element is concave at the paraxial region, and the image-side surface S6 of the third lens element is convex at the paraxial region;

In the present embodiment, FOV of optical lens 400 =157.4 °; the distance TTL between the object side surface of the first lens of the optical lens and the image surface is =5.75 mm.

The relevant parameters of each lens in the optical lens 400 in the present embodiment are shown in table 7.

TABLE 7

The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.

TABLE 8

In the present embodiment, the graphs of field curvature, distortion, on-axis point spherical aberration and lateral chromatic aberration of the optical lens 400 are shown in fig. 17, 18, 19 and 20, respectively, and it can be seen from fig. 17 to 20 that the field curvature is less than 0.1mm, which is better optimized by the design; the maximum distortion f-tan theta of the ultra-wide-angle lens only reaches 70%, and compared with the distortion f-tan theta of the common ultra-wide-angle lens which can reach 100%, the distortion is better optimized through the design; while the chromatic aberration is also well corrected.

Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the system focal length F, F #, total optical length TTL, and field angle 2 θ, and the values corresponding to each conditional expression.

TABLE 9

In summary, the optical lens provided in this embodiment has at least the following advantages:

(1) the FOV of a conventional lens of an optical lens commonly applied to a mobile phone in the market is 40-60 degrees, the conventional ultra-wide-angle high-pixel lens is only used for a high-end flagship at present, and the market prospect is still good. The optical lens provided by the invention has FOV =150 degrees, and meanwhile, the optical total length and the resolving power are good, so that the lightness and the thinness of the mobile phone body can be ensured on the premise of meeting the camera shooting function of a consumer.

(2) The six lenses with specific refractive power are adopted, and the specific surface shapes and the matching of the surface shapes are adopted, so that the structure is more compact while the wide visual angle is met, and the miniaturization of the lens and the balance of the wide visual angle are better realized.

(3) The depth of field is longer, the scene before and after the subject can be clearly imaged, the range of the shot scene can be wider, and great convenience is brought to later-stage cutting. In addition, the optical lens of the invention also enhances the spatial depth of the photographic picture, so that the imaging effect is more obvious.

The optical lens in the above embodiments can be applied to mobile phones, tablets, cameras, and other terminals.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical lens assembly, comprising six lenses, in order from an object side surface to an image plane in an optical axis direction:

a first lens element having a negative optical power, at a paraxial region, both an object-side surface and an image-side surface of which are concave;

a second lens having a positive optical power;

a diaphragm;

a third lens element having a positive optical power and a convex image-side surface at a paraxial region;

a fourth lens element having a positive optical power, wherein at a paraxial region, both the object-side surface and the image-side surface are convex;

a fifth lens having a negative optical power;

a sixth lens element with negative optical power, having a concave image-side surface at the paraxial region;

wherein the optical lens satisfies a relational expression,

FOV＞150°；

TTL＜5.8mm；

-6.2＜f12/f＜-1.2；

the FOV is the maximum field angle of the optical lens, the TTL is the total optical length of the optical lens, f12 is the combined focal length of the first lens and the second lens, and f is the focal length of the optical lens.

2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.4 <（CT1+CT2）/(ET1+ET2) < 1.2 ；

wherein CT1 and CT2 represent center thicknesses of the first lens and the second lens in the optical lens, respectively, and ET1 and ET2 represent edge thicknesses of the first lens and the second lens in the optical lens, respectively.

3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.5 <f34/f36 < 1.1 ；

where f34 denotes an effective focal length of third to fourth lenses in the optical lens, and f36 denotes an effective focal length of third to sixth lenses in the optical lens.

4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

1.1＜|f45|/f＜2.6；

wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is a focal length of the optical lens.

5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

0.03 <SAG51/R51+SAG52/R52< 0.45 ；

wherein SAG51 and SAG52 denote an object-side sagittal height and an image-side sagittal height, respectively, of a fifth lens in the optical lens, and R51 and R52 denote an object-side curvature radius and an image-side curvature radius, respectively, of the fifth lens in the optical lens.

6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

-2.5 <（CT5-ET5）/CT5< 0；

wherein CT5 represents a center thickness of a fifth lens in the optical lens, and ET5 represents an edge thickness of the fifth lens in the optical lens.

7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

-2 <(SAG62- SAG61)/SAG62< 0.5 ；

SAG61 represents the object side SAGs of the sixth lens in the optical lens, and SAG62 represents the image side SAGs of the sixth lens in the optical lens.

8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:

-5.5<( f4+f5+f6)/f< -3；

wherein f4, f5 and f6 respectively represent effective focal lengths of a fourth lens, a fifth lens and a sixth lens in the optical lens, and f represents an effective focal length of the optical lens.

9. An optical lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all plastic aspheric lenses.