CN212364696U

CN212364696U - Optical lens, image capturing module, electronic device and driving device

Info

Publication number: CN212364696U
Application number: CN202021433980.1U
Authority: CN
Inventors: 蔡雄宇; 兰宾利; 赵迪; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-07-20
Filing date: 2020-07-20
Publication date: 2021-01-15
Anticipated expiration: 2030-07-20

Abstract

The application relates to an optical lens, an image capturing module, an electronic device and a driving device. The optical lens sequentially comprises a first lens with negative refractive power from an object side to an image side along an optical axis, wherein the object side surface at a paraxial region is a convex surface, and the image side surface at the paraxial region is a concave surface; the second lens element with negative refractive power has a concave image-side surface at the paraxial region; a third lens element with positive refractive power; a fourth lens element with refractive power; a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region; a sixth lens element with negative refractive power having a convex image-side surface at the paraxial region; the sixth lens is cemented with the fifth lens; the optical lens further comprises a diaphragm, the diaphragm is arranged on the object side of the first lens or between the first lens and the sixth lens, and the object side surface and/or the image side surface of at least one of the first lens to the sixth lens are/is aspheric. The optical lens satisfies a specific relationship and is balanced in terms of widening a field angle range, securing high imaging performance, and achieving miniaturization.

Description

Optical lens, image capturing module, electronic device and driving device

Technical Field

The utility model relates to an optical imaging technology field especially relates to an optical lens, get for instance module, electron device and drive device.

Background

At present, with the increasing requirements of the country for road traffic safety and automobile safety and the rise of the around-looking camera, ADAS (Advanced Driving Assistance System) and unmanned Driving market, the vehicle-mounted lens is increasingly applied to the automobile Driving Assistance System. Meanwhile, people also put higher demands on the aspects of imaging quality, picture comfort and the like of the vehicle-mounted lens. Look around the camera, through with a plurality of super wide angle optical lens in the rational distribution of automobile body, splice the birds-eye view picture of car top all directions together, make the driver see car image all around clearly to effectively avoid backing a car and roll, scrape the emergence of accidents such as bumper and wheel hub, look around the camera simultaneously and can also discern parking passageway sign, curb and near vehicle, guaranteed the driving safety nature of car greatly.

The traditional super-wide angle optical lens is difficult to simultaneously meet the shooting and clear imaging of a large visual angle range, so that the early warning is difficult to accurately make in real time, and the driving risk is caused. In addition, the ultra-wide angle optical lens is usually assembled by matching a plurality of lenses in order to obtain a larger field angle, so that the lens has a larger size and a higher price, and is difficult to meet the market demand.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for an improved optical lens, which is difficult to balance the small size, wide viewing angle and high imaging performance of the conventional super-wide angle optical lens.

An optical lens, in order from an object side to an image side along an optical axis,

the first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the second lens element with negative refractive power has a concave image-side surface at the paraxial region;

a third lens element with positive refractive power;

a fourth lens element with refractive power;

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

a sixth lens element with negative refractive power having a convex image-side surface at a paraxial region;

the sixth lens is glued with the fifth lens;

the optical lens further comprises a diaphragm, the diaphragm is arranged on the object side of the first lens or between the first lens and the sixth lens, and the object side surface and/or the image side surface of at least one of the first lens to the sixth lens are aspheric surfaces;

the optical lens satisfies the following relation:

1/R56＜-1mm^-1；

wherein R56 denotes a radius of curvature of a cemented surface of the fifth lens and the sixth lens at an optical axis.

According to the optical lens, the imaging analysis capability of the lens can be enhanced and the aberration can be effectively corrected by selecting a proper number of lenses and reasonably distributing the refractive power and the surface type of each lens, so that the definition of an image is ensured; in addition, when the relation is met, the curvature radius of the gluing surfaces of the fifth lens and the sixth lens at the optical axis can be reasonably configured, so that the light rays can be further converged, the deviation of the incident angles and the emergent angles of the light rays with different fields of view can be reduced, and the resolving power of the lens can be improved.

In one embodiment, the optical lens satisfies the following relationship:

f56 is more than 3mm and less than 4 mm; wherein f56 denotes a combined focal length of the fifth lens and the sixth lens.

When the relationship is satisfied, the combined focal length of the fifth lens element and the sixth lens element is favorably and reasonably configured, so that astigmatism generated by the lens system is avoided, and the imaging quality of the lens is further improved.

In one embodiment, the optical lens satisfies the following relationship:

-9.5 < f1/f < -6.5; where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the optical lens.

When the upper limit of the relational expression is satisfied, the negative refractive power of the first lens element is ensured not to be too strong, so that the high-order aberration caused by the light beam at the periphery of the imaging region is favorably inhibited; when the lower limit of the relation is satisfied, the first lens element can provide enough negative refractive power for the lens, so that the decrease of the achromatic effect can be inhibited, and the lens has high resolution performance.

In one embodiment, the optical lens satisfies the following relationship:

-5 < f2/CT2 < -2; wherein f2 represents the effective focal length of the second lens, and CT2 represents the optic thickness of the second lens on the optical axis.

When the upper limit of the relation is met, the thickness of the second lens can be reasonably configured, so that the arrangement structure of the lens system is more compact, the miniaturization is realized, and the sensitivity of the rear lens group is reduced; when the lower limit of the relation is satisfied, the second lens element can provide enough negative refractive power for the lens, so that the decrease of the achromatic effect can be inhibited, and the lens has high resolution performance.

In one embodiment, the optical lens satisfies the following relationship:

4< f3/f < 12; where f3 denotes an effective focal length of the third lens, and f denotes an effective focal length of the optical lens.

When the relationship is satisfied, the third lens provides positive refractive power for the lens, so that light rays diverged by the negative refractive power of the first lens and the second lens can be converged, the distance between the third lens and the diaphragm is reduced, and the miniaturization of the lens is realized. In addition, the light converging burden of the fourth lens can be reduced. Specifically, when the upper limit of the above relation is satisfied, the third lens element can be ensured to provide sufficient positive refractive power for the lens, so that aberration can be corrected, and balance between lens volume reduction and lens resolving power improvement is obtained; when the lower limit of the above relation is satisfied, the positive refractive power of the third lens element is not excessively strong, and therefore the incident angles of the light rays on the object-side surface and the image-side surface of the third lens element do not become excessively large, which is advantageous for suppressing the generation of high-order aberrations.

In one embodiment, the optical lens satisfies the following relationship:

-14< f4/f < 43; where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens.

When the relationship is satisfied, the fourth lens element provides positive refractive power or negative refractive power for the lens element. Specifically, when f4/f is less than-14 and less than 0, the fourth lens provides negative refractive power for the lens, which is beneficial to reducing the distance between the third lens and the diaphragm, so that large-angle light rays can enter the lens, the object space imaging range of the optical lens is enlarged, and when f4/f is lower than the lower limit, the aberration of the optical lens is not corrected, and the imaging quality is easily reduced; when the refractive power is 0< f4/f <43, the fourth lens element provides positive refractive power to the lens element, which helps to further converge light rays and reduce the burden of converging light rays of the fifth lens element, and when f4/f exceeds the upper limit, the more serious astigmatism phenomenon is easily generated, which is not favorable for improving the imaging quality.

In one embodiment, the optical lens satisfies the following relationship:

f56/(CT5-CT6) < 3; wherein f56 denotes a combined focal length of the fifth lens and the sixth lens, CT5 denotes a spectacle lens thickness of the fifth lens on the optical axis, and CT6 denotes a spectacle lens thickness of the sixth lens on the optical axis.

When the above relationship is satisfied, the thicknesses of the fifth lens element and the sixth lens element can be reasonably configured, which is beneficial to reasonably matching the refractive powers of the fifth lens element and the sixth lens element when a positive lens element and a negative lens element are adopted, so as to perform mutual aberration correction, and provide the minimum aberration contribution ratio for the lens system by the fifth lens element and the sixth lens element. When the thickness of the fifth lens is lower than the lower limit of the relational expression, the difference between the central thicknesses of the fifth lens and the sixth lens is too large, so that the gluing process is not facilitated, and under the condition that the environmental high-temperature and low-temperature changes are large, the difference between cold and hot deformation quantities is also large, so that the phenomena of glue cracking or glue failure and the like are easily generated; when the upper limit of the conditional expression is exceeded, the combined focal length of the fifth lens element and the sixth lens element is too large, so that the refractive power provided by the fifth lens element and the sixth lens element for the lens system is too small, and the lens system is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality.

In one embodiment, the optical lens satisfies the following relationship:

-2 < (RS5+ RS6)/(RS5-RS6) < 3; wherein RS5 denotes a radius of curvature of an object-side surface of the third lens at an optical axis, and RS6 denotes a radius of curvature of an image-side surface of the third lens at the optical axis.

When the relation is satisfied, the curvature radii of the object side surface and the image side surface of the third lens at the optical axis can be reasonably configured, so that the bending degree of the third lens is controlled, the generation rate of ghost is reduced, and the resolution capability of the lens is improved.

In one embodiment, the optical lens satisfies the following relationship:

1 < | Sagf5|/(CT5-CT6) < 4; wherein Sagf5 represents a distance between a vertical projection point of an edge of an image side surface of the fifth lens on an optical axis and an intersection point of the image side surface of the fifth lens and the optical axis, CT5 represents a lens thickness of the fifth lens on the optical axis, and CT6 represents a lens thickness of the sixth lens on the optical axis.

When the relationship is satisfied, the parameter relationship between the fifth lens and the sixth lens can be reasonably configured, so that the ratio of ghost generation is reduced, the imaging quality is improved, and the lens has high resolution. When the height of the image side surface of the fifth lens element exceeds the upper limit of the relational expression, the higher the rise value of the image side surface of the fifth lens element, the more curved the cemented surface, which is disadvantageous to the cementing process, and is easy to increase the eccentricity of the cemented fifth lens element and the cemented sixth lens element and reduce the resolving power of the lens system.

In one embodiment, the optical lens satisfies the following relationship:

TTL/f is more than 15 and less than 19; wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens, and f represents an effective focal length of the optical lens.

The total length of the optical lens and the effective focal length of the lens are limited to meet the relation, so that the wide visual angle of the lens is guaranteed, the optical total length of the lens is controlled, and the miniaturization characteristic is realized. When the upper limit of the relational expression is exceeded, the total length of the optical lens is too long, which is not beneficial to miniaturization; if the effective focal length of the optical lens is too long below the lower limit of the relational expression, it is not favorable for satisfying the field angle range of the lens (i.e. not favorable for widening angle), and sufficient object space information cannot be obtained.

In one embodiment, the optical lens satisfies the following relationship:

2 < ∑ CT16/Σ D16 < 3; Σ CT16 represents the sum of the thicknesses of the first to sixth lenses on the optical axis, and Σ D16 represents the sum of the air distances on the optical axis from the image-side surface of the preceding lens to the object-side surface of the subsequent lens in each of the adjacent lenses of the first to sixth lenses.

When the relation is satisfied, the central thickness of each lens and the air space between adjacent lenses can be reasonably configured, so that the manufacturing sensitivity of the optical lens is reduced, the total length of the optical lens is effectively reduced, and the miniaturization is realized.

The application also provides an image capturing module.

An image capturing module includes the optical lens and a photosensitive element, wherein the photosensitive element is disposed at an image side of the optical lens.

Above-mentioned get for instance the module, utilize aforementioned optical lens can shoot and obtain the wide, high image of pixel of visual angle, get for instance the module simultaneously and still have miniaturized, lightweight structural feature, convenient adaptation to like mobile phone, dull and stereotyped and on-vehicle lens class restricted device of size, satisfy the market demand more easily.

The application also provides an electronic device.

An electronic device comprises a shell and the image capturing module, wherein the image capturing module is arranged on the shell.

Above-mentioned electronic device has lightweight characteristics, and utilizes aforementioned get for instance the module and can shoot and obtain the wide, the high image of pixel of visual angle, and then promotes user's shooting experience.

The application also provides a driving device.

A driving device comprises a vehicle body and the image capturing module, wherein the image capturing module is arranged on the vehicle body to acquire environmental information inside the vehicle body or around the vehicle body.

The driving device can timely and accurately acquire the internal or surrounding environmental information through the image acquisition module, judge the driving state of a driver according to the acquired internal information, or analyze the surrounding road conditions in real time according to the environmental information, thereby improving the driving safety.

Drawings

Fig. 1 is a schematic structural diagram showing an optical lens according to embodiment 1 of the present application;

fig. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 1;

fig. 3 is a schematic structural diagram showing an optical lens according to embodiment 2 of the present application;

fig. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 2;

fig. 5 is a schematic structural diagram showing an optical lens according to embodiment 3 of the present application;

fig. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 3;

fig. 7 is a schematic structural view showing an optical lens according to embodiment 4 of the present application;

fig. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 4;

fig. 9 is a schematic structural view showing an optical lens according to embodiment 5 of the present application;

fig. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 5;

fig. 11 is a schematic structural view showing an optical lens of embodiment 6 of the present application;

fig. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens of example 6;

fig. 13 is a schematic diagram illustrating an image capturing module according to an embodiment of the present application;

fig. 14 is a schematic view illustrating a driving device using an image capturing module according to an embodiment of the present application;

fig. 15 is a schematic view illustrating an electronic device using an image capturing module according to an embodiment of the disclosure.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown 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. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

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.

In the present description, the expressions first, second, third and the like are used only for distinguishing one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application. For ease of illustration, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

In this specification, a space on a side of the optical element where the object is located is referred to as an object side of the optical element, and correspondingly, a space on a side of the optical element where the object is located is referred to as an image side of the optical element. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface. And defines the positive direction with distance from the object side to the image side.

In addition, in the following description, if it appears that a lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least near the optical axis; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least at the position near the optical axis. Here, the paraxial region means a region near the optical axis. Specifically, the irregularity of the lens surface region is determined on the image side or the object side by the intersection point of the light ray passing through the region in parallel with the optical axis. For example, when the parallel light passes through the region, the light is focused toward the image side, and the intersection point of the light and the optical axis is located at the image side, the region is a convex surface; on the contrary, if the light ray passes through the region, the light ray is diverged, and the intersection point of the extension line of the light ray and the optical axis is at the object side, the region is a concave surface. In addition, the lens includes an optical axis vicinity region, a circumference vicinity region, and an extension portion for fixing the lens. Ideally, the imaging light does not pass through the extension portion, and therefore the range from the region near the optical axis to the region near the circumference can be defined as the effective aperture range of the lens. The following embodiments omit portions of the extensions for clarity of the drawings. Further, the method of determining the range of the optical axis vicinity region, the circumference vicinity region, or the plurality of regions is as follows:

first, a central point is defined as an intersection point of the lens surface and the optical axis, the distance from the central point to the boundary of the effective aperture range of the lens is the effective semi-aperture of the lens, and a point of inflection is located on the lens surface and is not located on the optical axis, and a tangent line passing through the point of inflection is perpendicular to the optical axis (i.e. the surface types of both sides of the point of inflection on the lens surface are opposite). If there are several points of inflection from the central point to the outside in the radial direction of the lens, the points of inflection are the first point of inflection and the second point of inflection in sequence, and the point of inflection farthest from the central point in the effective aperture range of the lens is the Nth point of inflection. Defining the range between the central point and the first inflection point as an area near the optical axis, defining an area radially outward of the Nth inflection point as an area near the circumference, and dividing the area between the first inflection point and the Nth inflection point into different areas according to the inflection points; if there is no inflection point on the lens surface, the region near the optical axis is defined as a region corresponding to 0 to 50% of the effective half-aperture, and the region near the circumference is defined as a region corresponding to 50 to 100% of the effective half-aperture.

The features, principles and other aspects of the present application are described in detail below.

Referring to fig. 1, fig. 3, fig. 5, fig. 7, fig. 9 and fig. 11, an optical lens system with wide viewing angle, high pixel and small size is provided in an embodiment of the present disclosure. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The six lenses are arranged in order from an object side to an image side along an optical axis from the first lens to the sixth lens, and an imaging surface of the optical lens is located at the image side of the sixth lens.

The optical lens is also provided with a diaphragm, and the diaphragm is arranged on the object side of the first lens or between the first lens and the sixth lens so as to better control the size of an incident beam and improve the imaging quality of the optical lens. Further, the diaphragm is arranged between the third lens and the fourth lens. Specifically, the diaphragms include an aperture diaphragm and a field diaphragm. Preferably, the diaphragm is an aperture diaphragm. The aperture stop may be located on a surface of the lens (e.g., the object side and the image side) and in operative relationship with the lens, for example, by applying a light blocking coating to the surface of the lens to form the aperture stop at the surface; or the surface of the clamping lens is fixedly clamped by the clamping piece, and the structure of the clamping piece on the surface can limit the width of the imaging light beam of the on-axis object point, so that the aperture stop is formed on the surface.

Specifically, the first lens element with negative refractive power has a convex object-side surface near-optical axis and a concave image-side surface near-optical axis, which is beneficial for enabling light rays incident at a large angle to enter the lens, thereby being beneficial for expanding the field range of the optical lens, simultaneously being beneficial for inhibiting the reduction of the achromatic effect of the lens and improving the resolution of the lens;

the second lens has negative refractive power, and the image side surface of the second lens is concave at the paraxial region, so that the width of incident light rays is favorably increased, the light rays incident at a large angle are further widened after being refracted and converted by the first lens, the pupil is filled, the light rays are fully transmitted to a high-pixel image surface, a wider field range is obtained, the reduction of the achromatic effect of the lens is favorably inhibited, and the high-pixel characteristic of the lens is realized.

The third lens element with positive refractive power. After the light rays are emitted from the first lens element and the second lens element with strong negative refractive power, the incident image surface of the light rays with marginal field of view is easy to generate larger field curvature, so that the negative refractive power of the lens element at the front end of the lens can be balanced by arranging the third lens element with positive refractive power, the marginal aberration is corrected, the imaging resolution of the lens is improved, the generation probability of ghost images is reduced, the distance between the third lens element and the diaphragm is favorably reduced, and the balance between miniaturization and improvement of the resolving power is realized.

The fourth lens element with positive or negative refractive power has a concave object-side surface near the optical axis, so that the configuration of the refractive power can be effectively dispersed, excessive aberration can be avoided, and the imaging quality can be further improved.

The fifth lens element with positive refractive power has a convex object-side surface at a paraxial region thereof, and the sixth lens element with negative refractive power has a convex image-side surface at a paraxial region thereof. The positive and negative refractive power of the fifth lens element and the sixth lens element can be used to reduce the sensitivity of the lens system, correct the chromatic aberration of the lens and the astigmatism generated by the refraction of the light beam through the front lens element, further correct the aberration, and improve the imaging resolution capability of the lens. Furthermore, the image side surface of the fifth lens element and the object side surface of the sixth lens element can be cemented, so that the overall structure of the optical lens is more compact, which is beneficial to correcting aberration, and balance is obtained between reducing the lens head volume and improving the lens resolving power, and meanwhile, the tolerance sensitivity problems such as tilt or eccentricity and the like generated in the assembling process of the lens can be reduced, and the assembling yield of the lens is improved.

As known to those skilled in the art, discrete lenses at ray breaks are susceptible to manufacturing errors and/or assembly errors, and the use of cemented lenses can effectively reduce the sensitivity of the lens. The cemented lens is used in the application, so that the sensitivity of the lens can be effectively reduced, the whole length of the lens can be shortened, the whole chromatic aberration and aberration correction of the lens can be shared, and the resolving power of the optical lens can be improved. Further, the cemented lens may include a lens with negative refractive power and a lens with positive refractive power. If the fifth lens element has positive refractive power, the sixth lens element has negative refractive power.

In addition, the object-side surface and/or the image-side surface of at least one of the first lens element to the sixth lens element is aspheric. By the mode, the flexibility of lens design can be improved, aberration can be effectively corrected, and the imaging quality of the optical lens can be improved. Specifically, the object side surface and the image side surface of each of the second lens to the sixth lens are aspheric, so that aberration generated in the light transmission process can be corrected better. It should be noted that the surface of each lens in the optical lens may also be any combination of spherical and aspherical surfaces, which is not limited in this application.

Further, the optical lens satisfies the following relation: 1/R56 < -1mm^-1. Where R56 denotes a radius of curvature of a cemented surface of the fifth lens and the sixth lens at the optical axis. 1/R56 may be-1.8 mm^-1、-1.6mm^-1、-1.5mm^-1、-1.45mm^-1、-1.4mm^-1、-1.35mm^-1、-1.3mm^-1、-1.2mm^-1Or-1.1 mm^-1. When the relationship is satisfied, the curvature radius of the bonding surface of the fifth lens and the sixth lens at the optical axis can be reasonably configured, so that the light rays can be further converged, the deviation of the light ray incidence angles and the light ray emergence angles of different fields of view can be reduced, and the resolving power of the lens can be improved. When the 1/R56 exceeds the range, the bonding surface is too flat or too curved, which is easy to increase the deviation of the incident angle and the exit angle of the light rays in different fields, and is not favorable for improving the resolution of the lens.

When the optical lens is used for imaging, light rays emitted or reflected by a shot object enter the optical lens from the object side direction, sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and finally converge on an imaging surface.

According to the optical lens, the imaging analysis capability of the lens can be enhanced and the aberration can be effectively corrected by selecting a proper number of lenses and reasonably distributing the refractive power and the surface type of each lens, so that the resolution of the lens is improved, and the definition of an image is ensured; meanwhile, when the bonding surfaces of the fifth lens and the sixth lens meet a specific relationship, further light convergence is facilitated, the deviation of the light incidence angles and the light emergence angles of different fields of view is reduced, and the resolving power of the lens is improved.

In an exemplary embodiment, the optical lens satisfies the following relationship: f56 is more than 3mm and less than 4 mm. Where f56 denotes a combined focal length of the fifth lens and the sixth lens. f56 may be 3.02mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm or 3.9 mm. When the relationship is satisfied, the combined focal length of the fifth lens element and the sixth lens element is favorably and reasonably configured, so that astigmatism generated by the lens system is avoided, and the imaging quality of the lens is further improved. When f56 exceeds the range, the refractive power provided by the fifth lens element and the sixth lens element to the lens assembly is too strong or too weak, which is not favorable for suppressing the astigmatism phenomenon, and the imaging quality of the lens assembly is reduced.

In an exemplary embodiment, the optical lens satisfies the following relationship:

-9.5 < f1/f < -6.5; where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the optical lens. f1/f can be-9, -8.7, -8.4, -8.1, -7.8, -7.5, -7.2, -6.9 or-6.6. When the upper limit of the relational expression is satisfied, the negative refractive power of the first lens element is ensured not to be too strong, so that the high-order aberration caused by the light beam at the periphery of the imaging region is favorably inhibited; when the lower limit of the relation is satisfied, the first lens element can provide enough negative refractive power for the lens, so that the decrease of the achromatic effect can be inhibited, and the lens has high resolution performance. When f1/f exceeds the upper limit, the negative refractive power of the first lens element is too strong to suppress the peripheral aberration; when f1/f is lower than the lower limit, the negative refractive power of the first lens element is weaker, which is not favorable for suppressing the decrease of the achromatic effect and is easy to reduce the resolution of the lens.

In an exemplary embodiment, the optical lens satisfies the following relationship: -5 < f2/CT2 < -2; where f2 denotes the effective focal length of the second lens, and CT2 denotes the optic thickness of the second lens on the optical axis. f2/CT2 can be-4.8, -4.4, -4, -3.8, -3.6, -3.4, -3.2, -3, -2.8 or-2.5. When the upper limit of the relation is met, the thickness of the second lens can be reasonably configured, so that the arrangement structure of the lens system is more compact, the miniaturization is realized, and the sensitivity of the rear lens group is reduced; when the lower limit of the relation is satisfied, the second lens element can provide enough negative refractive power for the lens, so that the decrease of the achromatic effect can be inhibited, and the lens has high resolution performance. When f2/CT2 exceeds the upper limit, the central thickness of the second lens is too large, which is not beneficial to miniaturization; when f2/CT2 is lower than the lower limit, the negative refractive power of the second lens element is weaker, which is not favorable for inhibiting the decrease of the achromatic effect and is easy to reduce the resolution of the lens.

4< f3/f < 12; where f3 denotes an effective focal length of the third lens, and f denotes an effective focal length of the optical lens. f3/f may be 4.1, 4.2, 4.3, 4.4, 4.5, 5, 6, 7, 8, 9, 10, 11 or 11.5. When the relationship is satisfied, the third lens provides positive refractive power for the lens, so that light rays diverged by the negative refractive power of the first lens and the second lens can be converged, the distance between the third lens and the diaphragm is reduced, and the miniaturization of the lens is realized. In addition, the light converging burden of the fourth lens can be reduced. Specifically, when the upper limit of the above relation is satisfied, the third lens element can be ensured to provide sufficient positive refractive power for the lens, so that aberration can be corrected, and balance between lens volume reduction and lens resolving power improvement is obtained; when the lower limit of the above relation is satisfied, the positive refractive power of the third lens element is not excessively strong, and therefore the incident angles of the light rays on the object-side surface and the image-side surface of the third lens element do not become excessively large, which is advantageous for suppressing the generation of high-order aberrations. When f3/f exceeds the upper limit, the positive refractive power of the third lens element is weaker, which is not favorable for aberration correction; when f3/f is lower than the lower limit, the positive refractive power of the third lens element is stronger, which tends to increase the incident angles of the light beams on the object-side and image-side surfaces of the third lens element, and is not favorable for suppressing the generation of high-order aberrations.

In an exemplary embodiment, the optical lens satisfies the following relationship: -14< f4/f < 43; where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens. f4/f can be-13.7, -13.5, -12, -11.5, -11, -5, 10, 20, 30, 40 or 42.5. When the relationship is satisfied, the fourth lens element provides positive refractive power or negative refractive power for the lens element. Specifically, when f4/f is less than-14 and less than 0, the fourth lens provides negative refractive power for the lens, which is beneficial to reducing the distance between the third lens and the diaphragm, so that large-angle light rays can enter the lens, the object space imaging range of the optical lens is enlarged, and when f4/f is lower than the lower limit, the aberration of the optical lens is not corrected, and the imaging quality is easily reduced; when the refractive power is 0< f4/f <43, the fourth lens element provides positive refractive power to the lens element, which helps to further converge light rays and reduce the burden of converging light rays of the fifth lens element, and when f4/f exceeds the upper limit, the more serious astigmatism phenomenon is easily generated, which is not favorable for improving the imaging quality.

f56/(CT5-CT6) < 3; wherein CT5 represents the optic thickness of the fifth lens on the optical axis, and CT6 represents the optic thickness of the sixth lens on the optical axis. f56/(CT5-CT6) may be 3.5, 4, 4.1, 4.2, 4.3, 4.4, 4.6, 4.9, 5.2, 5.5, or 5.8. When the above relationship is satisfied, the thicknesses of the fifth lens element and the sixth lens element can be reasonably configured, which is beneficial to reasonably matching the refractive powers of the fifth lens element and the sixth lens element when a positive lens element and a negative lens element are adopted, so as to perform mutual aberration correction, and provide the minimum aberration contribution ratio for the lens system by the fifth lens element and the sixth lens element. When f56/(CT5-CT6) is lower than the lower limit, the difference of the central thicknesses of the fifth lens and the sixth lens is too large, which is not beneficial to the gluing process, and under the condition of large environmental high and low temperature changes, the difference of cold and hot deformation quantities is also large, so that phenomena such as glue cracking or degumming are easily generated; when f56/(CT5-CT6) exceeds the upper limit, the combined focal length of the fifth lens element and the sixth lens element is too large, so that the total refractive power provided by the fifth lens element and the sixth lens element for the lens system is too small, and the lens system is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality.

-2 < (RS5+ RS6)/(RS5-RS6) < 3; wherein RS5 denotes a radius of curvature of the object-side surface of the third lens at the optical axis, and RS6 denotes a radius of curvature of the image-side surface of the third lens at the optical axis. (RS5+ RS6)/(RS5-RS6) may be-1.95, -1.5, -1, 1.4, 1.8, 2.2, 2.6 or 2.9. When the relation is satisfied, the curvature radii of the object side surface and the image side surface of the third lens at the optical axis can be reasonably configured, so that the bending degree of the third lens is controlled, the generation rate of ghost is reduced, and the resolution capability of the lens is improved. When the (RS5+ RS6)/(RS5-RS6) exceeds the upper limit or is lower than the lower limit, the object-side surface of the third lens is over-bent or the image-side surface of the third lens is over-bent, so that the generation probability of ghost images is increased, and the improvement of the imaging quality is not facilitated.

1 < | Sagf5|/(CT5-CT6) < 4; wherein, Sagf5 represents the distance between the vertical projection point of the edge of the image side surface of the fifth lens on the optical axis and the intersection point of the image side surface of the fifth lens and the optical axis, CT5 represents the lens thickness of the fifth lens on the optical axis, and CT6 represents the lens thickness of the sixth lens on the optical axis. | Sagf5|/(CT5-CT6) may be 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, or 3.4. When the relationship is satisfied, the parameter relationship between the fifth lens and the sixth lens can be reasonably configured, so that the ratio of ghost generation is reduced, the imaging quality is improved, and the lens has high resolution. When the Sagf 5/(CT 5-CT6) exceeds the upper limit, the higher the rise value of the image side surface of the fifth lens is, the more curved the gluing surface is, so that the gluing process is more unfavorable, the eccentricity between the fifth lens and the sixth lens after gluing is easily increased, and the resolution of the lens system is reduced; when the ratio of Sagf 5/(/ CT5-CT6) is lower than the lower limit, the difference between the central thicknesses of the fifth lens and the sixth lens is large, which is not favorable for the gluing process and is easy to generate the phenomena of glue crack or glue failure.

TTL/f is more than 15 and less than 19; wherein, TTL represents a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the optical lens, and f represents an effective focal length of the optical lens. TTL/f can be 15.05, 15.1, 15.2, 15.3, 15.4, 15.6, 16, 17, 18, 18.5 or 18.7. The total length of the optical lens and the effective focal length of the lens are limited to meet the relation, so that the wide visual angle of the lens is guaranteed, the optical total length of the lens is controlled, and the miniaturization characteristic is realized. When TTL/f exceeds the upper limit, the total length of the optical lens is too long, which is not beneficial to miniaturization; when TTL/f is lower than the lower limit, the effective focal length of the optical lens is too long, which is not favorable for satisfying the field angle range of the lens (i.e. not favorable for widening angle), and cannot obtain enough object space information.

2 < ∑ CT16/Σ D16 < 3; Σ CT16 represents the sum of the thicknesses of the first to sixth lenses on the optical axis, and Σ D16 represents the sum of the air distances on the optical axis from the image-side surface of the preceding lens to the object-side surface of the subsequent lens in each of the adjacent first to sixth lenses. Σ CT16/Σ D16 may be 2.2, 2.4, 2.5, 2.55, 2.6, 2.65, 2.7, 2.8 or 2.9. When the relation is satisfied, the central thickness of each lens and the air space between adjacent lenses can be reasonably configured, so that the manufacturing sensitivity of the optical lens is reduced, the total length of the optical lens is effectively reduced, and the miniaturization is realized. When the sigma CT 16/sigma D16 exceeds the upper limit or is lower than the lower limit, the central thickness of each lens of the lens is too large or the air space between adjacent lenses is too large, which is not favorable for realizing the miniaturization of the lens.

In an exemplary embodiment, an optical filter is further disposed between the sixth lens and the imaging surface of the optical lens, and is configured to filter light rays in a non-operating wavelength band, so as to prevent a phenomenon of generating a false color or moire due to interference of light rays in the non-operating wavelength band, and avoid distortion of imaging colors. Specifically, the optical filter may be an infrared filter, and the material of the optical filter is glass.

In an exemplary embodiment, each lens in the optical lens may be made of glass or plastic, the plastic lens can reduce the weight and production cost of the optical lens, and the glass lens can provide the optical lens with good temperature tolerance and excellent optical performance. Furthermore, when the optical lens is applied to a vehicle-mounted lens, the material of each lens is preferably glass, so that the vehicle-mounted lens can have better optical performance in different environments. It should be noted that the material of each lens in the optical lens may also be any combination of glass and plastic, and is not necessarily all glass or all plastic.

In an exemplary embodiment, the optical lens may further include a protective glass. The protective glass is arranged at the image side of the sixth lens or the image side of the optical filter, plays a role in protecting the photosensitive element, and can also prevent the photosensitive element from being polluted and dust falling, thereby further ensuring the imaging quality. It should be noted that when the optical lens is applied to an electronic device such as a mobile phone and a tablet, the protective glass may not be provided, so as to further reduce the weight of the electronic device.

The optical lens of the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By reasonably distributing the focal length, the refractive power, the surface shape, the thickness, the on-axis distance between the lenses and the like of each lens, the optical lens has the characteristics of large field angle, small total length and high resolution, and simultaneously has larger aperture (FNO can be 2.06) and lighter weight, thereby better meeting the application requirements of electronic equipment such as mobile phones, flat plates, vehicle-mounted lenses and the like. However, it will be understood by those skilled in the art that the number of lenses constituting the optical lens may be varied to obtain the respective results and advantages described in the present specification without departing from the technical solutions claimed in the present application.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens 100 of embodiment 1 of the present application is described below with reference to fig. 1 to 2.

Fig. 1 shows a schematic structural diagram of an optical lens 100 of embodiment 1. As shown in fig. 1, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

The first lens element L1 with negative refractive power has a spherical object-side surface S1 and an image-side surface S2, wherein the object-side surface S1 is convex at the paraxial region and the image-side surface S2 is concave at the paraxial region.

The second lens element L2 with negative refractive power has an object-side surface S3 and an image-side surface S4 that are aspheric, wherein the object-side surface S3 is concave at a paraxial region thereof and the image-side surface S4 is concave at a paraxial region thereof.

The third lens element L3 with positive refractive power has an object-side surface S5 and an image-side surface S6 that are aspheric, wherein the object-side surface S5 is convex at a paraxial region thereof and the image-side surface S6 is convex at a paraxial region thereof.

The fourth lens element L4 with positive refractive power has an object-side surface S7 and an image-side surface S8 that are aspheric, wherein the object-side surface S7 is concave at a paraxial region thereof and the image-side surface S8 is convex at a paraxial region thereof.

The fifth lens element L5 with positive refractive power has an object-side surface S9 and an image-side surface S10 that are aspheric, wherein the object-side surface S9 is convex at a paraxial region thereof and the image-side surface S10 is convex at a paraxial region thereof.

The sixth lens element L6 with negative refractive power has an object-side surface S11 and an image-side surface S12 that are aspheric, wherein the object-side surface S11 is concave at a paraxial region thereof and the image-side surface S12 is convex at a paraxial region thereof.

The object-side and image-side surfaces of the second lens element L2 through the sixth lens element L6 are aspheric, which is advantageous for correcting aberrations and solving the problem of image surface distortion, and enables the lens elements to achieve excellent optical imaging effects even when the lens elements are small, thin and flat, thereby enabling the optical lens system 100 to have a compact size.

The first lens L1 and the fourth lens L4 are made of glass, and the optical lens 100 has good temperature endurance and excellent optical performance due to the glass lens. The second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are all made of plastic, and the use of the plastic lens can reduce the weight of the optical lens 100 and reduce the production cost.

A stop STO is further disposed between the third lens L3 and the fourth lens L4 to limit the size of an incident light beam, and further improve the imaging quality of the optical lens 100. The optical lens 100 further includes a filter 110 disposed on the image side of the sixth lens element L6 and having an object-side surface S13 and an image-side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object-side surface S15 and an image-side surface S16. Light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17. The optical filter 110 is used for filtering the light rays in the non-working wavelength band, thereby preventing the phenomenon of generating false color or moire caused by the interference of the light rays in the non-working wavelength band, and avoiding the distortion of the imaging color. Specifically, the filter 110 is an infrared filter and is made of glass.

Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of the lens of the optical lens 100 of example 1, where the reference wavelength corresponding to the refractive index and abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, thickness, and effective focal length of the lens is millimeters (mm). In addition, taking the first lens element L1 as an example, the first numerical value in the "thickness" parameter row of the first lens element L1 is the optical thickness of the lens element, and the second numerical value is the optical distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element in the image-side direction; the numerical value of the stop ST0 in the "thickness" parameter column is the distance on the optical axis from the stop ST0 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens surface and the optical axis), and we default that the direction from the object-side surface to the image-side surface of the last lens of the first lens L1 is the positive direction of the optical axis, when the value is negative, it indicates that the stop ST0 is disposed on the right side of the vertex of the object-side surface of the lens in fig. 1, and when the thickness of the stop STO is positive, the stop is on the left side of the vertex of the object-.

TABLE 1

The aspherical surface shape in the lens is defined by the following formula:

wherein x is the rise of the distance from the aspheric surface vertex to 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 of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the ith order coefficient of the aspheric surface. Table 2 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical surfaces S3 to S12 of the lens in example 1.

TABLE 2

The TTL is 17.365mm from the object-side surface S1 of the first lens L1 to the image plane S17 of the optical lens 100 on the optical axis. As can be seen from the data in tables 1 and 2, the optical lens 100 in embodiment 1 satisfies:

1/R56＝-1.391mm^-1wherein R56 denotes a radius of curvature of a cemented surface of the fifth lens and the sixth lens at the optical axis;

f56 ═ 3.431mm, where f56 denotes a combined focal length of the fifth lens and the sixth lens;

f1/f — 7.102, where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the optical lens;

f2/CT2 is-3.614, wherein f2 represents the effective focal length of the second lens, and CT2 represents the lens thickness of the second lens on the optical axis;

f3/f 5.858, wherein f3 represents the effective focal length of the third lens;

f4/f 42.381, wherein f4 denotes an effective focal length of the fourth lens;

f56/(CT5-CT6) ═ 4.32, where CT5 denotes the optic thickness of the fifth lens on the optical axis, and CT6 denotes the optic thickness of the sixth lens on the optical axis;

(RS5+ RS6)/(RS5-RS6) — 1.947, where RS5 denotes a radius of curvature of the object-side surface of the third lens at the optical axis, and RS6 denotes a radius of curvature of the image-side surface of the third lens at the optical axis;

i Sagf5|/(CT5-CT6) ═ 1.64, where Sagf5 denotes a distance between a perpendicular projection point of the edge of the image side surface S10 of the fifth lens L5 on the optical axis and an intersection point of the image side surface 10 of the fifth lens L5 and the optical axis;

15.644, where TTL represents the distance on the optical axis from the object side surface of the first lens element to the imaging surface of the optical lens;

Σ CT16/Σ D16 is 2.625, where Σ CT16 denotes the sum of the thicknesses of the first to sixth lenses on the optical axis, and Σ D16 denotes the sum of the air distances on the optical axis from the image-side surface of the preceding lens to the object-side surface of the subsequent lens in each of the adjacent first to sixth lenses.

Fig. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of embodiment 1, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 2, the optical lens 100 according to embodiment 1 can achieve good imaging quality.

Example 2

An optical lens 100 of embodiment 2 of the present application is described below with reference to fig. 3 to 4. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical lens 100 according to embodiment 2 of the present application.

As shown in fig. 3, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

The fourth lens element L4 with negative refractive power has an object-side surface S7 and an image-side surface S8 that are aspheric, wherein the object-side surface S7 is concave at a paraxial region thereof and the image-side surface S8 is convex at a paraxial region thereof.

The object-side surface and the image-side surface of the second lens L2 through the sixth lens L6 are each set to an aspherical surface. The first lens L1 and the fourth lens L4 are made of glass, and the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are made of plastic. A stop STO is further disposed between the third lens L3 and the fourth lens L4 to limit the size of an incident light beam, and further improve the imaging quality of the optical lens 100. The optical lens 100 further includes a filter 110 disposed on the image side of the sixth lens element L6 and having an object-side surface S13 and an image-side surface S14, and a protective glass 120 disposed on the image side of the filter 110 and having an object-side surface S15 and an image-side surface S16. Light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17. Specifically, the filter 110 is an infrared filter and is made of glass.

Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number) of each lens of the optical lens 100 of example 2, and effective focal length of each lens, where the reference wavelength corresponding to the refractive index and the abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, the thickness, and the effective focal length of the lens are all millimeters (mm); table 4 shows high-order term coefficients that can be used for the lens aspherical surfaces S3 to S12 in embodiment 2, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1.

TABLE 3

TABLE 4

Fig. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of embodiment 2, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 4, the optical lens 100 according to embodiment 2 can achieve good imaging quality.

Example 3

An optical lens 100 of embodiment 3 of the present application is described below with reference to fig. 5 to 6. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 5 shows a schematic structural diagram of an optical lens 100 according to embodiment 3 of the present application.

As shown in fig. 5, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

Table 5 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number) of each lens of the optical lens 100 of example 3, and effective focal length of each lens, where the reference wavelength corresponding to the refractive index and the abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, the thickness, and the effective focal length of the lens are all millimeters (mm); table 6 shows high-order term coefficients that can be used for the lens aspherical surfaces S3 to S12 in embodiment 3, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1.

TABLE 5

TABLE 6

Fig. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of embodiment 3, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 6, the optical lens 100 according to embodiment 3 can achieve good imaging quality.

Example 4

An optical lens 100 of embodiment 4 of the present application is described below with reference to fig. 7 to 8. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 7 shows a schematic structural diagram of an optical lens 100 according to embodiment 4 of the present application.

As shown in fig. 7, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

Table 7 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number) of each lens of the optical lens 100 of example 4, and effective focal length of each lens, where the reference wavelength corresponding to the refractive index and the abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, the thickness, and the effective focal length of the lens are all millimeters (mm); table 8 shows high-order term coefficients that can be used for the lens aspherical surfaces S3 to S12 in example 4, wherein the aspherical surface type can be defined by formula (1) given in example 1.

TABLE 7

TABLE 8

Fig. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of example 4, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 8, the optical lens 100 according to embodiment 4 can achieve good imaging quality.

Example 5

An optical lens 100 of embodiment 5 of the present application is described below with reference to fig. 9 to 10. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 9 shows a schematic structural diagram of an optical lens 100 according to embodiment 5 of the present application.

As shown in fig. 9, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number) of each lens of the optical lens 100 of example 5, and effective focal length of each lens, where the reference wavelength corresponding to the refractive index and the abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, the thickness, and the effective focal length of the lens are all millimeters (mm); table 10 shows high-order term coefficients that can be used for the lens aspherical surfaces S3 to S12 in example 5, wherein the aspherical surface type can be defined by formula (1) given in example 1.

TABLE 9

Watch 10

Fig. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of example 5, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 10, the optical lens 100 according to embodiment 5 can achieve good imaging quality.

Example 6

An optical lens 100 of embodiment 6 of the present application is described below with reference to fig. 11 to 12. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 11 shows a schematic structural diagram of an optical lens 100 according to embodiment 6 of the present application.

As shown in fig. 11, the optical lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, and an image plane S17.

Table 11 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number) of each lens of the optical lens 100 of example 6, and effective focal length of each lens, in which the reference wavelength corresponding to the refractive index and the abbe number is 587.56nm, the reference wavelength corresponding to the effective focal length is 546.07nm, and the unit of the radius of curvature, the thickness, and the effective focal length of the lens is millimeters (mm); table 12 shows high-order term coefficients that can be used for the lens aspherical surfaces S3 to S12 in embodiment 6, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1.

TABLE 11

TABLE 12

Fig. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of example 6, respectively. Wherein the longitudinal spherical aberration plots show the deviation of the convergent focus of light rays having wavelengths of 435.83nm, 486.13nm, 546.07nm, 587.56nm, and 656.27nm after passing through the optical lens 100; the astigmatism graphs show meridional and sagittal curvature of field for a light ray with a wavelength of 546.07nm after passing through the optical lens 100; the distortion plot shows the distortion at different angles of view for a light ray having a wavelength of 546.07nm after passing through optical lens 100. As can be seen from fig. 12, the optical lens 100 according to embodiment 6 can achieve good imaging quality.

Table 13 shows the numerical values of the correlation equations of the present invention corresponding to the above embodiments.

Watch 13

As shown in fig. 13, the present application further provides an image capturing module 200, which includes the optical lens system 100 (shown in fig. 1) as described above; and a light sensing element 210, wherein the light sensing element 210 is arranged on the image side of the optical lens 100, and the light sensing surface of the light sensing element 210 is overlapped with the image forming surface S17. Specifically, the photosensitive element 210 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor, and the imaging surface S17 may be a plane or a curved surface with any curvature, especially a curved surface with a concave surface facing the object side, depending on the photosensitive element 210.

In other embodiments, the image capturing module 200 further includes a lens barrel (not shown) for carrying the optical lens 100 and a corresponding supporting device (not shown).

In addition, the image capturing module 200 further includes a driving device (not shown) and an image stabilizing module (not shown). The driving device may have an Auto-Focus (Auto-Focus) function, and the driving method may use a driving system such as a Voice Coil Motor (VCM), a Micro Electro-Mechanical Systems (MEMS), a Piezoelectric system (piezo electric), and a Memory metal (Shape Memory Alloy). The driving device can make the optical lens 100 obtain a better imaging position, so that the shot object can be shot to obtain a clear image under the state of different object distances; the image stabilization module may be an accelerometer, a gyroscope, or a Hall Effect Sensor. The driving device and the Image stabilizing module together serve as an Optical anti-shake device (OIS), and compensate a blurred Image generated by shaking at the moment of shooting by adjusting the displacement of the Optical lens 100 on the Optical axis, or provide an Electronic anti-shake function (EIS) by using an Image compensation technology in Image software, so as to further improve the imaging quality of shooting dynamic and low-illumination scenes.

The image capturing module 200 can capture an image with high pixels and wide viewing angle by using the optical lens 100, and the image capturing module 200 has the structural characteristics of miniaturization and light weight. The image capturing module 200 can be applied to the fields of mobile phones, automobiles, monitoring, medical treatment and the like. The camera can be used as a mobile phone camera, a vehicle-mounted camera, a monitoring camera or an endoscope and the like, and has a wide market application range.

As shown in fig. 14, the image capturing module 200 can be used as a vehicle-mounted camera in a driving device 300. Steering device 300 may be an autonomous vehicle or a non-autonomous vehicle. The image capturing module 200 can be used as a front camera, a rear camera, a side camera or an internal camera of the driving device 300. Specifically, the driving device 300 includes a vehicle body 310, and the image capturing module 200 is mounted at any position of the vehicle body 310, such as a left rear view mirror, a right rear view mirror, a rear box, a front light, and a rear light, so as to obtain a clear image around the vehicle body 310. In addition, still be provided with display screen 320 among the controlling device 300, display screen 320 installs in automobile body 310, and gets for instance module 200 and display screen 320 communication connection, gets for instance the image information that module 200 obtained and can transmit and show to display screen 320 in to make the driver can obtain more complete peripheral image information, improve the safety guarantee when driving. When the image capturing module 200 is applied to the driving assistance system, the image capturing module 200 may be disposed inside the vehicle body 310 to obtain the driving state of the driver, so as to remind the driver of paying attention during fatigue driving, thereby further improving the driving safety.

In particular, in some embodiments, the image capturing module 200 can be applied to an auto-driving vehicle. With reference to fig. 14, the image capturing module 200 is mounted at any position on the body of the automatic driving vehicle, and specifically, reference may be made to the mounting position of the image capturing module 200 in the driving device 300 according to the above embodiment. For an auto-driven vehicle, the image capturing module 200 can also be mounted on the top of the vehicle body. At this time, by installing a plurality of image capturing modules 200 on the autonomous vehicle to obtain environment information of a 360 ° view angle around the vehicle body 310, the environment information obtained by the image capturing modules 200 is transmitted to the analysis processing unit of the autonomous vehicle to analyze the road condition around the vehicle body 310 in real time. By adopting the image capturing module 200, the accuracy of the identification and analysis of the analysis processing unit can be improved, and the safety performance during automatic driving is improved.

As shown in fig. 15, the image capturing module 200 can also be used as a light and thin camera in an electronic device 400. The electronic device 400 includes a housing 410 and the image capturing module 200 as described above, wherein the image capturing module 200 is mounted on the housing 410. Specifically, the image capturing module 200 is disposed in the housing 410 and exposed from the housing 410 to obtain an image, the housing 410 can provide protection for the image capturing module 200, such as dust prevention, water prevention, falling prevention, and the like, and the housing 410 is provided with a hole corresponding to the image capturing module 200, so that light rays can penetrate into or out of the housing through the hole.

The electronic device 400 has a light weight, and can capture an image with a wide viewing angle and a high pixel by using the image capturing module 200. In other embodiments, the electronic device 400 is further provided with a corresponding processing system, and the electronic device 400 can transmit the image to the corresponding processing system in time after the image of the object is captured, so that the system can make accurate analysis and judgment.

In other embodiments, the use of "electronic device" may also include, but is not limited to, devices configured to receive or transmit communication signals via a wireline connection and/or via a wireless interface. Electronic devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the "electronic device" may further include a three-dimensional image capturing device, a digital camera, a tablet computer, a smart television, a network monitoring device, a car recorder, a car backing developing device, a multi-lens device, an identification system, a motion sensing game machine, a wearable device, and the like. The electronic device is only an exemplary practical application example of the present invention, and is not intended to limit the application scope of the image capturing module of the present application.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical lens assembly includes, in order from an object side to an image side along an optical axis,

a third lens element with positive refractive power;

a fourth lens element with refractive power;

the sixth lens is glued with the fifth lens;

the optical lens satisfies the following relation:

1/R56＜-1mm^-1；

2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

3mm＜f56＜4mm；

wherein f56 denotes a combined focal length of the fifth lens and the sixth lens.

3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-9.5＜f1/f＜-6.5；

where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the optical lens.

4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-5＜f2/CT2＜-2；

wherein f2 represents the effective focal length of the second lens, and CT2 represents the optic thickness of the second lens on the optical axis.

5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

4＜f3/f＜12；

where f3 denotes an effective focal length of the third lens, and f denotes an effective focal length of the optical lens.

6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-14＜f4/f＜43；

where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens.

7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

3＜f56/(CT5-CT6)＜6；

wherein f56 denotes a combined focal length of the fifth lens and the sixth lens, CT5 denotes a spectacle lens thickness of the fifth lens on the optical axis, and CT6 denotes a spectacle lens thickness of the sixth lens on the optical axis.

8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

-2＜(RS5+RS6)/(RS5-RS6)＜3；

wherein RS5 denotes a radius of curvature of an object-side surface of the third lens at an optical axis, and RS6 denotes a radius of curvature of an image-side surface of the third lens at the optical axis.

9. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

1＜|Sagf5|/(CT5-CT6)＜4；

wherein Sagf5 represents a distance between a vertical projection point of an edge of an image side surface of the fifth lens on an optical axis and an intersection point of the image side surface of the fifth lens and the optical axis, CT5 represents a lens thickness of the fifth lens on the optical axis, and CT6 represents a lens thickness of the sixth lens on the optical axis.

10. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

15＜TTL/f＜19；

wherein, TTL represents a distance on an optical axis from an object side surface of the first lens element to an imaging surface of the optical lens, and f represents an effective focal length of the optical lens.

11. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:

2＜∑CT16/∑D16＜3；

Σ CT16 represents the sum of the thicknesses of the first to sixth lenses on the optical axis, and Σ D16 represents the sum of the air distances on the optical axis from the image-side surface of the preceding lens to the object-side surface of the subsequent lens in each of the adjacent lenses of the first to sixth lenses.

12. An image capturing module, comprising the optical lens of any one of claims 1 to 11 and a photosensitive element, wherein the photosensitive element is disposed on an image side of the optical lens.

13. An electronic device, comprising a housing and the image capturing module as claimed in claim 12, wherein the image capturing module is mounted on the housing.

14. A driving apparatus, comprising a vehicle body and the image capturing module as claimed in claim 12, wherein the image capturing module is disposed on the vehicle body to obtain environmental information inside or around the vehicle body.