CN111258031A

CN111258031A - Optical lens, imaging module, electronic device and driving device

Info

Publication number: CN111258031A
Application number: CN202010187400.3A
Authority: CN
Inventors: 蔡雄宇; 兰宾利; 赵迪; 周芮
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-06-09

Abstract

The application relates to an optical lens, an imaging 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; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; and the diaphragm is arranged on the object side of the optical lens or between the first lens and the sixth lens. The optical lens has the characteristics of wide visual angle, larger field depth range, high image resolution capability and miniaturization.

Description

Optical lens, imaging module, electronic device and driving device

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, an imaging module, an electronic device, and a driving device.

Background

In recent years, with the development of vehicle-mounted technology, the technical requirements of front-view or side-view cameras, automatic cruise instruments, automobile data recorders, and back-up cameras on vehicle-mounted cameras have become higher and higher. The forward-looking or side-looking camera device can be used as a camera system in an advanced driver assistance system to analyze video content, and Lane Departure Warning (LDW), automatic Lane Keeping Assistance (LKA), high beam/low beam control and Traffic Sign Recognition (TSR) are achieved. For example, when parking, the forward-looking or side-looking camera device is controlled to be started, so that a driver can visually see the obstacles in front of the vehicle, and the parking operation is facilitated; when the automobile passes through a special place (such as a roadblock, a parking lot and the like), the forward-looking or side-looking camera device can be automatically opened to acquire the environmental information around the automobile and feed back the environmental information to the automobile central system to make the central system make a correct instruction, so that driving accidents are avoided.

However, the image captured by the conventional forward-looking or side-looking lens has low resolution and small depth of field range, and cannot be captured in a wide-angle range while presenting remote details, so that the driving assistance system cannot accurately judge the environmental information around the vehicle in real time to make timely early warning or evasion, and certain driving risk exists.

Disclosure of Invention

Therefore, an improved optical lens is needed to be provided for solving the problems that the conventional vehicle-mounted camera has low resolution and is difficult to take a large depth of field range and a large angle range.

An optical lens comprises, in order from an object side to an image side along an optical axis, a first lens element with negative refractive power; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a fourth lens element with positive refractive power; a fifth lens element with positive refractive power; a sixth lens element with negative refractive power; and the diaphragm is arranged on the object side of the optical lens or between the first lens and the sixth lens.

According to the optical lens, the refractive power, the surface type and the effective focal length of each lens are reasonably distributed by selecting a proper number of lenses, so that the wide-angle shooting performance of the optical lens can be ensured, the imaging analysis capability of the lens is enhanced, the aberration is effectively corrected, and the scene details can be accurately captured; in addition, the optical lens has the characteristic of miniaturization structure, and is convenient to adapt to light and thin electronic products.

In one embodiment, the fifth lens and the sixth lens are cemented, and the optical lens satisfies the following relation: r56 is less than 0; where R56 denotes a radius of curvature of the cemented surface of the fifth lens and the sixth lens at the optical axis, in mm.

The fifth lens and the sixth lens are bonded, so that the bonding surface is concave to the object side, the whole structure of the optical lens can be more compact, the tolerance sensitivity problems such as inclination or eccentricity and the like generated in the assembling process of the lenses are reduced, and the assembly yield of the lens is improved; meanwhile, the method is also beneficial to correcting chromatic aberration, and further improves the imaging quality.

In one embodiment, the optical lens satisfies the following relationship: -2 < f1/f < -0.5; 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 met, negative refractive power can be provided for the optical lens, and the negative refractive power of the first lens cannot be too strong, so that the lens has a wider shooting visual angle; when the lower limit of the relation is satisfied, the negative refractive power of the first lens element can be ensured, which is beneficial to reducing the sensitivity of the lens and enabling the lens to have the characteristic of miniaturization.

In one embodiment, the optical lens satisfies the following relationship: RS1/CT1 is more than 30; wherein RS1 denotes a radius of curvature of the object-side surface of the first lens at the optical axis, and CT1 denotes a thickness of the first lens on the optical axis.

When the relation is met, the curvature radius of the object side surface of the first lens at the optical axis and the thickness of the first lens on the optical axis can be reasonably distributed, so that the bending degree of the object side surface of the first lens can be controlled; when the lower limit of the relational expression is met, the central aberration can be restrained, the lens can be easily widened, the eccentric risk caused by the fact that the first lens is bent due to the fact that the curvature radius of the object side face of the first lens at the optical axis is too small can be avoided, and the processing difficulty of the lens is reduced.

In one embodiment, the optical lens satisfies the following relationship: RS1/CT1 is more than or equal to 70.

When the curvature radius of the object side surface of the first lens at the optical axis tends to infinity, the object side surface of the first lens approaches to a plane, and at the moment, the wide angle of the lens can be ensured, the lens aberration can be better inhibited, and the sensitivity of the optical lens is reduced.

In one embodiment, the optical lens satisfies the following relationship: f23/f is more than 0.5 and less than 3; wherein f23 denotes a combined focal length of the second lens and the third lens, and f denotes an effective focal length of the optical lens.

When the upper limit of the relational expression is met, the second lens and the third lens can be ensured to integrally provide positive refractive power for the lens, so that light rays diverged by the negative refractive power of the first lens can be converged, the diaphragm can be closer to the second lens and the third lens, the lens is easier to miniaturize, and meanwhile, the convergent light ray burden of the fourth lens and the fifth lens can be reduced; when the lower limit of the relational expression is satisfied, the positive refractive power of the second lens element and the third lens element as a whole is not too strong, so that the included angles between the incident light rays and the normals on the object-side surface and the image-side surface of the third lens element are not too large, and the generation of high-order aberration is favorably inhibited.

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

1 < | RS2-RS3|/D12 < 4; wherein RS2 represents a radius of curvature of the first lens image-side surface at the optical axis, RS3 represents a radius of curvature of the second lens object-side surface at the optical axis, and D12 represents a distance on the optical axis from the first lens image-side surface to the second lens object-side surface.

When the relation is met, the curvature radiuses of the object side surface of the first lens and the image side surface of the second lens at the optical axis can be reasonably configured, so that the difference of the curvature radiuses of the two surfaces is not too large, and the processing and assembling difficulty of the first lens and the second lens is reduced; when the absolute value of RS2-RS 3/D12 is lower than the lower limit or higher than the upper limit, a large eccentricity problem is easily caused during processing or assembling, so that the processing difficulty is increased, and the surface precision stability of two surfaces is poor.

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

-9 < (RS3+ RS4)/(RS3-RS4) < -4; wherein RS3 represents the radius of curvature of the object-side surface of the second lens at the optical axis, and RS4 represents the radius of curvature of the image-side surface of the second lens at the optical axis.

By meeting the upper limit of the relational expression, the incident angle of the principal ray of the peripheral visual angle is favorably reduced, so that the pixel units at the edge position of the photosensitive element can more effectively receive the light, and the resolution of the image is improved; by satisfying the lower limit of the relational expression, the occurrence of the lens astigmatism can be suppressed.

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

4 < RS7/(RS8+ CT4) < 8; wherein RS7 represents a radius of curvature of the object-side surface of the fourth lens at the optical axis, RS8 represents a radius of curvature of the image-side surface of the fourth lens at the optical axis, and CT4 represents a thickness of the fourth lens at the optical axis.

When the relation is met, the curvature radius of the object side surface and the image side surface of the fourth lens at the optical axis and the thickness of the fourth lens on the optical axis can be reasonably set, so that the bending degree of the fourth lens can be effectively controlled, the occurrence of aberration is inhibited, and the wide angle of the lens is easier; when the RS7/(RS8+ CT4) is lower than the lower limit or higher than the upper limit, the convergence ability of the fourth lens to the light emitted from the third lens is easily reduced, which is not favorable for suppressing the aberration of the lens, and it is difficult to ensure the imaging quality of the lens.

In one embodiment, the optical lens satisfies the following relationship: f4/f is more than 0.5 and less than 3; where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens.

The fourth lens can be ensured to provide positive refractive power for the lens by meeting the upper limit of the relational expression, so that light rays emitted by the third lens can be further converged, and the imaging quality is ensured; by satisfying the lower limit of the relational expression, the positive refractive power can not become too strong, so that the occurrence of high-order aberration is inhibited, and meanwhile, the sensitivity of the lens group can be reduced, and the production yield is improved.

In one embodiment, the optical lens satisfies the following relationship: -13 < f56/f < -4; where f56 denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical lens.

By satisfying the upper limit of the relational expression, the negative refractive power of the fifth lens element and the sixth lens element as a whole can not be too strong, and the refractive power of the fifth lens element and the cemented surface of the sixth lens element can not be too strong, so that the suppression of high-order aberration caused by light beams around the imaging region is facilitated; by meeting the lower limit of the relational expression, the fifth lens and the sixth lens can be ensured to have certain negative refractive power integrally, so that the achromatization effect is ensured, and the detail resolution capability of the lens is improved.

In one embodiment, the optical lens satisfies the following relationship: BFL/f is more than 0 and less than 2; wherein BFL represents a back focal length of the optical lens, and f represents an effective focal length of the optical lens.

The rear focal length of the optical lens and the effective focal length of the optical lens are controlled to meet the relationship, so that a larger optical rear focus can be obtained, the lens has a telecentric effect, the sensitivity of the optical lens can be reduced, the total length of the lens can be shortened, and the miniaturization of the lens can be realized.

In one embodiment, the optical lens satisfies the following relationship: nd6-Nd5 is more than 0; wherein Nd6 denotes a d-optical refractive index of the sixth lens, and Nd5 denotes a d-optical refractive index of the fifth lens.

The refractive indexes of the light d of the fifth lens and the light d of the sixth lens are controlled to meet the relation, so that the off-axis chromatic aberration can be corrected, the resolution of the lens is improved, and the definition of an image is guaranteed.

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

50 degrees < (FOV x f)/ImgH < 70 degrees; wherein f represents the effective focal length of the optical lens, FOV represents the field angle of the optical lens in the diagonal direction, and ImgH represents the diagonal length of the effective pixel area on the imaging surface of the optical lens.

When the relation is satisfied, the large wide-angle characteristic of the lens is favorably ensured, the resolving power of the optical lens can be improved, and the imaging quality is improved.

In one embodiment, the optical lens satisfies the following relationship: TTL/f is more than 2 and less than 6; 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.

When the relation is satisfied, the reasonable configuration of the total length of the lens and the effective focal length of the lens is facilitated, and the wide-angle and miniaturization of the lens are realized simultaneously; when the TTL/f is lower than the lower limit, the focal length is easily too long, which is not good for the wide angle, and when the TTL/f is higher than the upper limit, the total length of the lens is easily too long, which is not good for the miniaturization.

The application also provides an imaging module.

An imaging module comprises the optical lens and a photosensitive element, wherein the photosensitive element is arranged at the image side of the optical lens.

The imaging module can shoot images with large depth of field range, high pixels and wide visual angle by utilizing the optical lens, has the structural characteristics of miniaturization and light weight, and is convenient to adapt to devices with limited sizes such as mobile phones, flat plates and vehicle-mounted lenses.

The application also provides an electronic device.

An electronic device comprises a shell and the imaging module, wherein the imaging module is installed on the shell.

The electronic device can shoot images with wide visual angle, high pixel and large field depth range by utilizing the imaging module, and can transmit the images to the corresponding processing system in time so that the system can make accurate analysis and judgment.

The application also provides a driving device.

The driving device comprises a vehicle body and the imaging module, wherein the imaging module is arranged on the vehicle body to acquire environmental information around the vehicle body.

The driving device can timely and accurately acquire the surrounding environmental information through the imaging module, and can analyze the surrounding road conditions in real time according to the acquired environmental information, so that the driving safety is improved.

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 structural view showing an optical lens of embodiment 7 of the present application;

fig. 14 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the optical lens of example 7;

fig. 15 is a schematic structural view showing an optical lens according to embodiment 8 of the present application;

fig. 16 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens of example 8;

fig. 17 is a schematic structural view showing an optical lens according to embodiment 9 of the present application;

fig. 18 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the optical lens of example 9;

FIG. 19 shows a schematic view of an imaging module according to an embodiment of the present application;

FIG. 20 is a schematic view of a driving device using an imaging module according to an embodiment of the present disclosure;

fig. 21 is a schematic view of an electronic device using an imaging module according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This 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 for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present 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.

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, fig. 11, fig. 13, fig. 15, and fig. 17, an optical lens system with wide viewing angle, high pixel density, and small size is provided in an embodiment of the present disclosure. Specifically, the optical lens includes six lens elements with refractive power, namely a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The six lenses are arranged in sequence from an object side to an image side along an optical axis, and an imaging surface of the optical lens is positioned at the image side of the sixth lens.

The first lens has negative refractive power, so that large-angle light can enter the optical lens, and the light is converged to an imaging surface of the lens through refraction of other lenses in the optical lens, and the imaging quality is improved.

The second lens element with negative refractive power has a concave object-side surface, which is favorable for correcting astigmatism generated by the refraction of light rays through the first lens element, thereby further improving the imaging quality.

The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface, so that light rays diverged by strong negative refractive power of the first and second lens elements can be converged, and the distance between the third lens element and the diaphragm is reduced, thereby enabling the lens assembly to be more compact in structure and easy to miniaturize.

The fourth lens element with positive refractive power can further converge the light refracted by the third lens element, thereby ensuring the imaging quality.

The fifth lens element with positive refractive power and the sixth lens element with negative refractive power can correct chromatic aberration of the lens assembly, correct aberration, and improve image resolution of the lens assembly. 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 a balance is obtained between reducing the lens body 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 the correction of the aberration 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, such as the fifth lens element with positive refractive power and the sixth lens element with negative refractive power.

The optical lens is also provided with a diaphragm, and the diaphragm is arranged at the object side of the optical 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.

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.

In an exemplary embodiment, the fifth lens and the sixth lens are cemented, and the optical lens satisfies the following relation: r56 is less than 0; where R56 denotes a radius of curvature of the cemented surface of the fifth lens and the sixth lens at the optical axis, in mm. R56 can be-3 mm, -2.9mm, -2.8mm, -2.7mm, -2.6mm, -2.5mm, -2.4mm, -2.3mm, -2.2mm or-2.1 mm. The fifth lens and the sixth lens are bonded, so that the bonding surface is concave to the object side, the whole structure of the optical lens can be more compact, the tolerance sensitivity problems such as inclination or eccentricity and the like generated in the assembling process of the lenses are reduced, and the assembly yield of the lens is improved; meanwhile, the method is also beneficial to correcting chromatic aberration, and further improves the imaging quality.

In an exemplary embodiment, the optical lens satisfies the following relationship: -2 < f1/f < -0.5; 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-1.9, -1.6, -1.5, -1.4, -1.35, -1.3, -1.25, -1.2 or-1.1. When the upper limit of the relational expression is met, negative refractive power can be provided for the optical lens, and the negative refractive power of the first lens cannot be too strong, so that the lens has a wider shooting visual angle; when the lower limit of the relation is satisfied, the negative refractive power of the first lens element can be ensured, which is beneficial to reducing the sensitivity of the lens and enabling the lens to have the characteristic of miniaturization. When f1/f is greater than or equal to 0, negative refractive power cannot be provided for the lens, and the wide angle cannot be ensured; when f1/f is smaller than or equal to-2, the negative refractive power of the first lens element is smaller or the effective focal length of the lens is too long, which is not favorable for reducing the sensitivity of the lens and realizing the miniaturization and wide angle of the lens.

In an exemplary embodiment, the optical lens satisfies the following relationship: RS1/CT1 is more than 30; where RS1 denotes the radius of curvature of the object-side surface of the first lens at the optical axis, and CT1 denotes the thickness of the first lens on the optical axis. RS1/CT1 can be 35, 40, 45, 50, 55, 60, 65, 70, 75 or 80. When the relation is met, the curvature radius of the object side surface of the first lens at the optical axis and the thickness of the first lens on the optical axis can be reasonably distributed, so that the bending degree of the object side surface of the first lens can be controlled; when the lower limit of the relational expression is met, the occurrence of central aberration of the lens is favorably inhibited, the lens is easy to widen and angle, the eccentric risk caused by over-bending of the first lens due to the fact that the curvature radius of the object side surface of the first lens at the optical axis is too small can be avoided, and the processing difficulty of the lens is reduced.

Further, the optical lens satisfies the following relation: RS1/CT1 is more than or equal to 70. RS1/CT1 can be 70, 80, 90, 100, 110, 120, or infinite. When the curvature radius of the object side surface of the first lens at the optical axis is controlled to be larger than or equal to 70 and even tends to infinity, the object side surface of the first lens approaches a plane, and at the moment, the wide angle of the lens can be ensured, the lens aberration can be better inhibited, and the sensitivity of the optical lens is reduced.

In an exemplary embodiment, the optical lens satisfies the following relationship: f23/f is more than 0.5 and less than 3; where f23 denotes a combined focal length of the second lens and the third lens, and f denotes an effective focal length of the optical lens. f23/f may be 1, 1.2, 1.4, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 2, 2.5 or 2.8. When the upper limit of the relational expression is met, the second lens and the third lens can be ensured to integrally provide positive refractive power for the lens, so that light rays diverged by the negative refractive power of the first lens can be converged, the diaphragm can be closer to the second lens and the third lens, the lens is easier to miniaturize, and meanwhile, the convergent light ray burden of the fourth lens and the fifth lens can be reduced; when the lower limit of the relational expression is satisfied, the positive refractive power of the second lens element and the third lens element as a whole is not too strong, so that the included angles between the incident light rays and the normals on the object-side surface and the image-side surface of the third lens element are not too large, and the generation of high-order aberration is favorably inhibited.

In an exemplary embodiment, the optical lens satisfies the following relationship: 1 < | RS2-RS3|/D12 < 4; wherein RS2 represents the radius of curvature of the image-side surface of the first lens at the optical axis, RS3 represents the radius of curvature of the object-side surface of the second lens at the optical axis, and D12 represents the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the second lens. | RS2-RS3|/D12 can be 2, 2.2, 2.4, 2.6, 2.8, 3, 3.1, 3.2, 3.5, or 3.8. When the relation is met, the curvature radiuses of the object side surface of the first lens and the image side surface of the second lens at the optical axis can be reasonably set, so that the difference of the curvature radiuses of the two surfaces is not too large, and the processing and assembling difficulty of the first lens and the second lens is reduced; when the absolute value of RS2-RS 3/D12 is lower than the lower limit or higher than the upper limit, a large eccentricity problem is easily caused during processing or assembling, so that the processing difficulty is increased, and the surface precision stability of two surfaces is poor.

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

-9 < (RS3+ RS4)/(RS3-RS4) < -4; wherein RS3 denotes the radius of curvature of the object-side surface of the second lens at the optical axis, and RS4 denotes the radius of curvature of the image-side surface of the second lens at the optical axis. (RS3+ RS4)/(RS3-RS4) may be-8.5, -8, -7, -6.8, -6.6, -6.4, -6.2, -6, -5.5, -5 or-4.5. By meeting the upper limit of the relational expression, the incident angle of the principal ray of the peripheral visual angle is favorably reduced, so that the pixel units at the edge position of the photosensitive element can more effectively receive the light, and the resolution of the image is improved; by satisfying the lower limit of the relational expression, the occurrence of the lens astigmatism can be suppressed.

4 < RS7/(RS8+ CT4) < 8; wherein RS7 denotes a radius of curvature of the object-side surface of the fourth lens at the optical axis, RS8 denotes a radius of curvature of the image-side surface of the fourth lens at the optical axis, and CT4 denotes a thickness of the fourth lens at the optical axis. S7(RS8+ CT4) may be 4.5, 5, 5.3, 5.6, 5.9, 6.2, 6.5, 6.8, 7.1, 7.4, or 7.7. When the relation is met, the curvature radius of the object side surface and the image side surface of the fourth lens at the optical axis and the thickness of the fourth lens on the optical axis can be reasonably set, so that the bending degree of the fourth lens can be effectively controlled, the occurrence of aberration is inhibited, and the wide angle of the lens is easier; when the RS7/(RS8+ CT4) is lower than the lower limit or higher than the upper limit, the convergence ability of the fourth lens to the light emitted from the third lens is easily reduced, which is not favorable for suppressing the lens aberration and is difficult to ensure the imaging quality of the lens.

In an exemplary embodiment, the optical lens satisfies the following relationship: f4/f is more than 0.5 and less than 3; where f4 denotes an effective focal length of the fourth lens, and f denotes an effective focal length of the optical lens. f4/f may be 1, 1.3, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.2, 2.5 or 2.8. The fourth lens can be ensured to provide positive refractive power for the lens by meeting the upper limit of the relational expression, so that light rays emitted by the third lens can be further converged, and the imaging quality is ensured; by satisfying the lower limit of the relational expression, the positive refractive power can not become too strong, so that the occurrence of high-order aberration is inhibited, and meanwhile, the sensitivity of the rear partial lens group can be reduced, and the production yield is improved.

In an exemplary embodiment, the optical lens satisfies the following relationship: -13 < f56/f < -4; where f56 denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical lens. f56/f can be-12.5, -12, -11.5, -11, -10.5, -10, -9.5, -9, -8, -7, -6, -5 or-4.1. By satisfying the upper limit of the relational expression, the negative refractive power of the fifth lens element and the sixth lens element as a whole can not be too strong, and the refractive power of the fifth lens element and the cemented surface of the sixth lens element can not be too strong, so that the suppression of high-order aberration caused by light beams around the imaging region is facilitated; by meeting the lower limit of the relational expression, the fifth lens and the sixth lens can be ensured to have certain negative refractive power integrally, so that the achromatization effect is ensured, and the detail resolution capability of the lens is improved. When f56/f is greater than or equal to-4, the negative refractive power of the fifth lens element and the sixth lens element is too strong, which is not favorable for suppressing the aberration of the peripheral field; when f56/f is less than or equal to-13, the negative refractive power of the fifth lens element and the sixth lens element is small, so that the achromatic effect is easily reduced, and the resolution performance of the lens is not high.

In an exemplary embodiment, the optical lens satisfies the following relationship: BFL/f is more than 0 and less than 2; where BFL denotes a back focal length of the optical lens, and f denotes an effective focal length of the optical lens. The BFL/f may be 1.1, 1.2, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.7, 1.8, or 1.9. The rear focal length of the optical lens and the effective focal length of the optical lens are controlled to meet the relationship, so that a larger optical rear focus can be obtained, the lens has a telecentric effect, the sensitivity of the optical lens can be reduced, the total length of the lens can be shortened, and the miniaturization of the lens can be realized.

In an exemplary embodiment, the optical lens satisfies the following relationship: nd6-Nd5 is more than 0; where Nd6 denotes the d-optical refractive index of the sixth lens, and Nd5 denotes the d-optical refractive index of the fifth lens. Specifically, d-light refers to light having a wavelength of 587.56 nm. Nd6-Nd5 may be 0.03, 0.1, 0.13, 0.16, 0.2, 0.23, 0.25, 0.27, 0.29, or 0.3. The refractive indexes of the light d of the fifth lens and the light d of the sixth lens are controlled to meet the relation, so that the off-axis chromatic aberration can be corrected, the resolution of the lens is improved, and the definition of an image is guaranteed.

In an exemplary embodiment, the optical lens satisfies the following relationship: 50 degrees < (FOV x f)/ImgH < 70 degrees; where f denotes an effective focal length of the optical lens, FOV denotes a field angle in a diagonal direction of the optical lens, and ImgH denotes a diagonal length of an effective pixel region on an imaging plane of the optical lens. (FOV xf)/ImgH may be 55, 60.2, 60.9, 61, 61.5, 62, 62.5, 63, 63.5, or 64 in degrees. When the relation is satisfied, the large wide-angle characteristic of the lens is favorably ensured, the resolving power of the optical lens can be improved, and the imaging quality is improved. When (FOV × f)/ImgH is lower than the lower limit or higher than the upper limit, it is difficult to balance between ensuring the wide angle of the lens and improving the resolution.

In an exemplary embodiment, the optical lens satisfies the following relationship: TTL/f is more than 2 and less than 6; 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 3, 4, 4.5, 4.8, 4.85, 4.9, 4.95, 5, 5.4, or 5.8. When the relation is satisfied, the reasonable configuration of the total length of the lens and the effective focal length of the lens is facilitated, and the wide-angle and miniaturization of the lens are realized simultaneously; when the TTL/f is lower than the lower limit, the focal length is easily too long, which is not good for the wide angle, and when the TTL/f is higher than the upper limit, the total length of the lens is easily too long, which is not good for the miniaturization.

In an exemplary embodiment, an object-side surface and/or an image-side surface of at least one of the first lens to the sixth lens is an aspherical surface. 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. It should be noted that the surfaces of the lenses in the optical lens may also be any combination of spherical surfaces and aspherical surfaces, and are not necessarily all spherical surfaces or all aspherical surfaces.

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. Further, when used in an in-vehicle system, the material of each lens is preferably glass. 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 further includes an infrared filter. The infrared filter is arranged at the image side of the sixth lens and used for filtering incident light, particularly isolating infrared light and preventing the infrared light from being absorbed by the photosensitive element, so that the influence of the infrared light on the color and the definition of a normal image is avoided, and the imaging quality of the optical lens is improved.

In an exemplary embodiment, the optical lens further includes a protective glass. The protective glass is arranged at the image side of the infrared filter, plays a role of protecting the photosensitive element, and can also prevent the photosensitive element from being polluted and dust falling, thereby further ensuring the imaging quality.

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. Through reasonable distribution of focal length, refractive power, surface type, thickness of each lens, on-axis distance between each lens and the like, the total length of the optical lens is small, the optical lens is light and has high imaging resolution, and meanwhile, the optical lens further has a large aperture (FNO can be 2.0) and a large field angle, so that the application requirements of light-weight electronic equipment such as a lens, a mobile phone and a flat panel of a vehicle-mounted auxiliary system are better met. 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 a spherical image-side surface S2, wherein the object-side surface S1 is convex and the image-side surface S2 is concave.

The second lens element L2 with negative refractive power has a spherical object-side surface S3 and a spherical image-side surface S4, wherein the object-side surface S3 is concave and the image-side surface S4 is convex.

The third lens element L3 with positive refractive power has a spherical object-side surface S5 and a spherical image-side surface S6, wherein the object-side surface S5 is convex and the image-side surface S6 is convex.

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 a spherical object-side surface S9 and a spherical image-side surface S10, wherein the object-side surface S9 is concave and the image-side surface S10 is convex.

The sixth lens element L6 with negative refractive power has a spherical object-side surface S11 and a spherical image-side surface S12, wherein the object-side surface S11 is concave and the image-side surface S12 is convex.

The image side surface S10 of the fifth lens element L5 and the object side surface S11 of the sixth lens element L6 are cemented together to form a cemented lens, so that the overall structure of the optical lens 100 is more compact, the tolerance sensitivity problems such as tilt and eccentricity generated during the assembly of the lens elements are reduced, and the assembly yield of the lens elements is improved.

The object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are both aspheric, which is advantageous for correcting aberrations and solving the problem of image surface distortion, and enables the lens element to achieve excellent optical imaging effects even when the lens element is small, thin and flat, thereby enabling the optical lens system 100 to have a compact size.

The first lens L1 to the sixth lens L6 are made of glass, and the optical lens 100 has good temperature tolerance and excellent optical performance by using the glass lens, so that the imaging quality is further ensured.

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. Further, the optical filter 110 is an infrared filter for filtering out infrared light from the external light incident on the optical lens 100, so as to avoid color distortion. Specifically, the material of the filter 110 is 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, wherein 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 sequence of the first lens element L1 is the thickness of the lens element on the optical axis, and the second numerical value is the distance between the image-side surface of the lens element and 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 and the optical axis), and we default that the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens 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 S7 to S8 of the lens in example 1.

TABLE 2

The distance TTL on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S17 of the optical lens 100 is 17.1mm, and the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the optical lens 100 is 6.61 mm. As can be seen from the data in tables 1 and 2, the optical lens 100 in embodiment 1 satisfies:

r56 ═ 2.48mm, where R56 denotes a radius of curvature of the cemented surface of the fifth lens L5 and the sixth lens L6 at the optical axis;

f1/f — 1.456, where f1 denotes an effective focal length of the first lens L1, and f denotes an effective focal length of the optical lens 100;

RS1/CT1 ═ 37.8, where RS1 denotes the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis, and CT1 denotes the thickness of the first lens L1 at the optical axis;

f23/f is 1.827, where f23 denotes a combined focal length of the second lens L2 and the third lens L3, and f denotes an effective focal length of the optical lens 100;

RS2-RS 3/D12 is 2.852, where RS2 represents the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis, RS3 represents the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis, and D12 represents the distance of the image-side surface S2 of the first lens L1 to the object-side surface S3 of the second lens L2 on the optical axis;

(RS3+ RS4)/(RS3-RS4) — 6.711, where RS3 denotes a radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis, RS4 denotes a radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis, and CT4 denotes a thickness of the fourth lens L4 at the optical axis;

RS7/(RS8+ CT4) ═ 5.79, where RS7 denotes the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis, RS8 denotes the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis, and CT4 denotes the thickness of the fourth lens L4 at the optical axis;

f4/f is 1.684, where f4 denotes an effective focal length of the fourth lens L4, and f denotes an effective focal length of the optical lens 100;

f56/f — 5.141, where f56 denotes a combined focal length of the fifth lens L5 and the sixth lens L6, and f denotes an effective focal length of the optical lens 100;

BFL/f is 1.348, where BFL denotes a back focal length of the optical lens 100 and f denotes an effective focal length of the optical lens 100;

nd6-Nd5 is 0.133, where Nd6 denotes the d-light refractive index of the sixth lens L6, and Nd5 denotes the d-light refractive index of the fifth lens L5;

(FOV × f)/ImgH is 60.297 degrees, where f denotes an effective focal length of the optical lens 100, FOV denotes a field angle of the optical lens 100 in a diagonal direction, and ImgH denotes a diagonal length of an effective pixel region on the imaging plane S17 of the optical lens 100;

4.985, where TTL denotes an axial distance from the object-side surface S1 of the first lens L1 to the image plane S17 of the optical lens 100, and f denotes an effective focal length of the optical lens 100.

Fig. 2 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical lens 100 of example 1, respectively, and the reference wavelength of the optical lens 100 is 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the 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 object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both aspheric. The first lens element L1 to the sixth lens element L6 are all made of glass. 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. Further, the optical filter 110 is an infrared filter for filtering out infrared light from the external light incident on the optical lens 100, so as to avoid color distortion.

Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 2, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 4 shows high-order term coefficients that can be used for the lens aspheres S7-S8 in example 2, in which the aspherical surface types can be defined by formula (1) given in example 1; table 5 shows the values of relevant parameters of the optical lens 100 given in embodiment 2.

TABLE 3

TABLE 4

TABLE 5

Fig. 4 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of embodiment 2, and the reference wavelength of the optical lens 100 is 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the 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 6 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 3, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 7 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in embodiment 3, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1; table 8 shows the values of relevant parameters of the optical lens 100 given in embodiment 3.

TABLE 6

TABLE 7

TABLE 8

Fig. 6 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of embodiment 3, the reference wavelength of the optical lens 100 being 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the 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 9 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 4, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 10 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in embodiment 4, wherein the aspherical surface types can be defined by formula (1) given in embodiment 1; table 11 shows the values of relevant parameters of the optical lens 100 given in embodiment 4.

TABLE 9

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TABLE 11

Fig. 8 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of embodiment 4, the reference wavelength of the optical lens 100 being 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the 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 12 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 5, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 13 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in example 5, wherein the aspherical surface type can be defined by formula (1) given in example 1; table 14 shows the values of relevant parameters of the optical lens 100 given in embodiment 5.

TABLE 12

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TABLE 14

Fig. 10 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of example 5, the reference wavelength of the optical lens 100 being 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the 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 15 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 6, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 16 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in example 6, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 17 shows the values of relevant parameters of the optical lens 100 given in embodiment 6.

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TABLE 16

TABLE 17

Fig. 12 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of example 6, the reference wavelength of the optical lens 100 being 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the optical lens 100. As can be seen from fig. 12, the optical lens 100 according to embodiment 6 can achieve good imaging quality.

Example 7

An optical lens 100 of embodiment 7 of the present application is described below with reference to fig. 13 to 14. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 13 is a schematic structural diagram showing an optical lens 100 according to embodiment 7 of the present application.

As shown in fig. 13, 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 planar object-side surface S1 and a spherical image-side surface S2, wherein the image-side surface S2 is concave.

Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 7, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 19 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in example 7, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 20 shows the values of relevant parameters of the optical lens 100 given in embodiment 7.

Watch 18

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Fig. 14 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of example 7, the optical lens 100 having a reference wavelength of 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the optical lens 100. As can be seen from fig. 14, the optical lens 100 according to embodiment 7 can achieve good imaging quality.

Example 8

An optical lens 100 of embodiment 8 of the present application is described below with reference to fig. 15 to 16. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 15 shows a schematic structural diagram of an optical lens 100 according to embodiment 8 of the present application.

As shown in fig. 15, 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 21 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 8, where the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 22 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in embodiment 8, wherein the aspherical surface types can be defined by formula (1) given in embodiment 1; table 23 shows the values of relevant parameters of the optical lens 100 given in embodiment 8.

TABLE 21

TABLE 22

TABLE 23

Fig. 16 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of example 8, the optical lens 100 having a reference wavelength of 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the optical lens 100. As can be seen from fig. 16, the optical lens 100 according to embodiment 8 can achieve good imaging quality.

Example 9

An optical lens 100 of embodiment 9 of the present application is described below with reference to fig. 17 to 18. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 17 shows a schematic structural diagram of an optical lens 100 according to embodiment 9 of the present application.

As shown in fig. 17, 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 24 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of the optical lens 100 of example 9, wherein the unit of the radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 25 shows high-order term coefficients that can be used for the lens aspherical surfaces S7 to S8 in example 9, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 26 shows the values of relevant parameters of the optical lens 100 given in example 9.

Watch 24

TABLE 25

Watch 26

Fig. 18 shows a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph, respectively, of the optical lens 100 of example 9, the optical lens 100 having a reference wavelength of 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays having wavelengths of 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the optical lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the optical lens 100; the distortion graph shows the distortion of light with a wavelength of 587.56nm at different image heights after passing through the optical lens 100. As can be seen from fig. 18, the optical lens 100 according to embodiment 9 can achieve good imaging quality.

As shown in fig. 19, the present application further provides an imaging module 200, including the optical lens 100 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.

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

As shown in fig. 20, the imaging module 200 may be applied to a driving device 300 as an in-vehicle camera. Steering device 300 may be an autonomous vehicle or a non-autonomous vehicle. The imaging module 200 may be used as a front camera, a rear camera or a side camera of the driving device 300. Specifically, the driving device 300 includes a vehicle body 310, and the imaging 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 environment 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 imaging module 200 and display screen 320 communication connection, and the image information that imaging module 200 obtained 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.

In particular, in some embodiments, the imaging module 200 may be used in an autonomous vehicle. With continued reference to fig. 20, the imaging module 200 is mounted at any position on the body of the autonomous vehicle, and specific reference may be made to the mounting position of the imaging module 200 in the driving device 300 according to the above embodiment. For an autonomous vehicle, the imaging module 200 may also be mounted on top of the vehicle body. At this time, by installing a plurality of imaging modules 200 on the autonomous vehicle to obtain environmental information of a 360 ° view angle around the vehicle body 310, the environmental information obtained by the imaging modules 200 will be transmitted to an analysis processing unit of the autonomous vehicle to analyze road conditions around the vehicle body 310 in real time. Through adopting imaging module 200, can improve the accuracy of analysis processing unit identification and analysis to security performance when promoting autopilot.

As shown in fig. 21, the present application further provides an electronic device 400, which includes a housing 410 and the imaging module 200 as described above, wherein the imaging module 200 is mounted on the housing 410. Specifically, the imaging module 200 is disposed in the housing 410 and exposed from the housing 410 to acquire an image, the housing 410 can provide protection such as dust prevention, water prevention, falling prevention for the imaging module 200, and the housing 410 is provided with a hole corresponding to the imaging module 200, so that light can penetrate into or penetrate out of the housing through the hole.

The electronic device 400 can capture an image with a wide viewing angle, a high pixel, and a wide depth of field by using the imaging 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.

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 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 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, in order from an object side to an image side along an optical axis, comprising:

a first lens element with negative refractive power;

a second lens element with negative refractive power having a concave object-side surface;

a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface;

a fourth lens element with positive refractive power;

a fifth lens element with positive refractive power;

a sixth lens element with negative refractive power; and the number of the first and second groups,

and the diaphragm is arranged on the object side of the optical lens or between the first lens and the sixth lens.

2. An optical lens according to claim 1, wherein the fifth lens and the sixth lens are cemented, and the optical lens satisfies the following relation:

R56＜0；

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

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

-2＜f1/f＜-0.5；

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:

RS1/CT1＞30；

wherein RS1 denotes a radius of curvature of the object-side surface of the first lens at the optical axis, and CT1 denotes a thickness of the first lens on the optical axis.

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

RS1/CT1≥70。

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

0.5＜f23/f＜3；

wherein f23 denotes a combined focal length of the second lens and the third 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:

1＜|RS2-RS3|/D12＜4；

wherein RS2 represents a radius of curvature of the first lens image-side surface at the optical axis, RS3 represents a radius of curvature of the second lens object-side surface at the optical axis, and D12 represents a distance on the optical axis from the first lens image-side surface to the second lens object-side surface.

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

-9＜(RS3+RS4)/(RS3-RS4)＜-4；

wherein RS3 represents the radius of curvature of the object-side surface of the second lens at the optical axis, and RS4 represents the radius of curvature of the image-side surface of the second lens at the optical axis.

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

4＜RS7/(RS8+CT4)＜8；

wherein RS7 represents a radius of curvature of the object-side surface of the fourth lens at the optical axis, RS8 represents a radius of curvature of the image-side surface of the fourth lens at the optical axis, and CT4 represents a thickness of the fourth lens at the optical axis.

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

0.5＜f4/f＜3；

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

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

-13＜f56/f＜-4；

where f56 denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical lens.

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

0＜BFL/f＜2；

wherein BFL represents a back focal length of the optical lens, and f represents an effective focal length of the optical lens.

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

Nd6-Nd5＞0；

wherein Nd6 denotes a d-optical refractive index of the sixth lens, and Nd5 denotes a d-optical refractive index of the fifth lens.

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

50 degrees < (FOV x f)/ImgH < 70 degrees;

wherein f represents the effective focal length of the optical lens, FOV represents the field angle of the optical lens in the diagonal direction, and ImgH represents the diagonal length of the effective pixel area on the imaging surface of the optical lens.

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

2＜TTL/f＜6；

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.

16. An imaging module comprising the optical lens of any one of claims 1 to 15 and a photosensitive element, wherein the photosensitive element is disposed on an image side of the optical lens.

17. An electronic device comprising a housing and the imaging module of claim 16, wherein the imaging module is mounted on the housing.

18. A driving device comprising a vehicle body and the imaging module of claim 16, wherein the imaging module is disposed on the vehicle body to obtain environmental information around the vehicle body.