CN111273426A

CN111273426A - Wide-angle lens, imaging module, electronic device and driving device

Info

Publication number: CN111273426A
Application number: CN202010188196.7A
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: 2020-06-12

Abstract

The application relates to a wide-angle lens, an imaging module, an electronic device and a driving device. The wide-angle lens comprises a first lens element with negative refractive power along an optical axis from an object side to an image side, wherein the object side surface at a paraxial region is convex, and the image side surface at a paraxial region is concave; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power; a fourth lens element with negative refractive power having a concave image-side surface; a fifth lens element with positive refractive power having a convex object-side surface; a sixth lens element with positive refractive power; and a diaphragm provided on an object side of the sixth lens. When the wide-angle lens meets the specific relation, the wide-angle lens has wide visual angle and high resolution capability, and simultaneously has miniaturization, and the imaging quality of the wide-angle lens is less influenced by the ambient temperature.

Description

Wide-angle 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 a wide-angle 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 forward-looking cameras, automatic cruise instruments, automobile data recorders and reverse-view cameras on vehicle-mounted cameras have become higher and higher. The forward-looking camera device can be used as a camera system in an advanced driver assistance system to analyze video content and realize Lane Departure Warning (LDW), automatic Lane Keeping Assistance (LKA), high beam/low beam control and Traffic Sign Recognition (TSR). For example, when parking, the forward-looking camera device is automatically started, and a driver can visually see the obstacles in front of the vehicle, so that 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 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 automobile central system make a correct instruction, so that driving accidents are avoided.

The conventional vehicle-mounted lens generally adopts more than six lenses to obtain higher resolving power. However, increasing the number of lenses affects miniaturization of the lens, which is disadvantageous for mounting and using the lens, and increases the cost of the lens. In addition, the resolution of images shot by the traditional forward-looking wide-angle lens is low, the field depth range is small, and shooting in a wide-angle range cannot be realized while long-distance details are presented, so that a driving auxiliary system cannot accurately judge the environmental information around the vehicle in real time to make timely early warning or avoidance, and certain driving risk exists.

Disclosure of Invention

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

A wide-angle lens, comprising, 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; a second lens element with negative refractive power having a concave object-side surface; a third lens element with positive refractive power; a fourth lens element with negative refractive power having a concave image-side surface; a fifth lens element with positive refractive power having a convex object-side surface; a sixth lens element with positive refractive power; the diaphragm is arranged on the object side of the wide-angle lens or between the first lens and the sixth lens;

the wide-angle lens satisfies the following relation:

-2×10^-6/k＜dn5/dt5＜4.5×10^-6k is; wherein dn5/dt5 represents the temperature coefficient of relative refractive index of the fifth lens in the range of 20-40 ℃.

According to the wide-angle 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 imaging analysis capability of the wide-angle lens can be enhanced, the aberration can be effectively corrected, and the details of a scene can be captured more accurately; meanwhile, the temperature coefficient of the relative refractive index of the fifth lens in the working temperature range is controlled to meet the relationship, so that the refractive index change of other lenses is compensated, the influence of the temperature change on the image resolving capability of the lens is reduced, and the consistency of the imaging performance of the wide-angle lens at different temperatures is ensured.

In one embodiment, an object-side surface and/or an image-side surface of at least one of the first lens to the sixth lens is aspheric.

By the mode, the flexibility of lens design can be improved, aberration can be effectively corrected, and the imaging quality of the wide-angle lens is improved.

In one embodiment, the fourth lens and the fifth lens are cemented, and the wide-angle lens satisfies the following relation: r45 > 0; wherein R45 denotes a radius of curvature of a cemented surface of the fourth lens and the fifth lens at an optical axis, in mm.

By gluing the fourth lens and the fifth lens, the whole structure of the wide-angle lens can be more compact, the tolerance sensitivity problems such as inclination or eccentricity and the like generated in the assembling process of the lens can be reduced, and the assembling yield of the lens can be improved; meanwhile, the method is also beneficial to correcting chromatic aberration, and further improves the imaging quality.

In one embodiment, the wide-angle lens satisfies the following relationship: -4 < f1/f < 0; where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the wide-angle lens.

The focal length of the first lens and the effective focal length of the wide-angle lens meet the relationship through the relational expression, negative refractive power can be provided for the lens, and the negative refractive power of the first lens cannot be too strong through meeting the upper limit of the conditional expression, so that the occurrence of high-order aberration caused by light beams at the periphery of an imaging area can be favorably inhibited; the lower limit of the conditional expression is satisfied, and the negative refractive power of the first lens can be ensured, so that the decrease of the achromatic effect is restrained, and the lens has high resolution performance.

In one embodiment, the wide-angle lens satisfies the following relationship: f123/f is more than 0 and less than 4; wherein f123 denotes a combined focal length of the first lens, the second lens, and the third lens, and f denotes an effective focal length of the wide-angle lens.

When satisfying above-mentioned relation, be favorable to rationally setting up the effective focal length of first lens, second lens and third lens, provide positive refracting power for the camera lens to can make the structure of camera lens more compact, when guaranteeing wide visual angle and low sensitivity, realize the miniaturization.

In one embodiment, the wide-angle lens satisfies the following relationship:

0 < (RS2-RS1)/f1 < 1; wherein RS1 represents the radius of curvature of the first lens object side surface at the optical axis, RS2 represents the radius of curvature of the first lens image side surface at the optical axis, and f1 represents the effective focal length of the first lens.

When satisfying above-mentioned relation, can rationally set up the curvature radius of first lens object side and image side to reduce the processing degree of difficulty of lens, reduce the eccentric risk in the course of working.

In one embodiment, the wide-angle lens satisfies the following relationship:

-6 < (RS3+ RS4)/(RS3-RS4) < 2; 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.

When the lower limit of the relational expression is met, the incidence angle of the chief ray of the marginal field of view is favorably reduced, so that the lens is better matched with the photosensitive element, and the imaging quality is improved; when the upper limit of the above relational expression is satisfied, astigmatism can be suppressed advantageously, and the imaging quality can be further improved.

In one embodiment, the wide-angle lens satisfies the following relationship:

5 < | RS6|/| RS5| < 11; wherein RS5 represents the radius of curvature of the object-side surface of the third lens at the optical axis, and RS6 represents the radius of curvature of the image-side surface of the third lens at the optical axis.

When satisfying above-mentioned relation, can rationally set up the curvature radius of third lens object side and image side in optical axis department to be favorable to controlling the bending degree of lens, reduce the processing degree of difficulty of lens, reduce the eccentric risk in the course of working.

In one embodiment, the wide-angle lens satisfies the following relationship: 4 < TTL/Sigma D < 5;

wherein TTL represents a distance on an optical axis from an object-side surface of the first lens element to an image plane of the wide-angle lens, and Σ D represents a sum of distances on the optical axis from an image-side surface of a preceding lens element to an object-side surface of a subsequent lens element in each of adjacent lens elements of the first lens element to the sixth lens element.

When the relationship is met, the air intervals between every two adjacent lenses can be reasonably configured, so that the structure of the lens is more compact, and the miniaturization of the lens is realized; meanwhile, the arrangement is also beneficial to increasing the thermal stability of the lens.

In one embodiment, the wide-angle lens satisfies the following relationship: f456/f < 5 is more than 1; wherein f456 represents a combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f represents an effective focal length of the wide-angle lens.

When the relationship is satisfied, the fourth lens element, the fifth lens element and the sixth lens element can provide positive refractive power for the lens as a whole, and the refractive powers of the lens elements are reasonably configured according to the relationship, which is beneficial to reducing the sensitivity of the system, improving the production yield, ensuring the miniaturization characteristic of the system, simultaneously being beneficial to correcting aberration, and balancing between reducing the lens area and improving the lens resolving power.

In one embodiment, the wide-angle lens satisfies the following relationship: vd3 is more than 40, Vd5 is more than 40;

wherein Vd3 denotes a d-ray abbe number of the third lens, and Vd5 denotes a d-ray abbe number of the fifth lens.

The d-ray abbe numbers of the third lens and the fifth lens are controlled to meet the relation, so that the off-axis chromatic aberration of the lens can be corrected, the resolution of the lens is improved, and the imaging definition is ensured.

In one embodiment, the wide-angle lens satisfies the following relationship: -2X 10^-6/k＜dn5/dt5＜-0.1×10^-6/k。

The temperature coefficient of the relative refractive index of the fifth lens within the range of 20-40 ℃ is controlled to further satisfy the relationship, so that the refractive index change of the lens at different temperatures can be compensated better, the influence of the temperature change on the image resolving capability of the lens is reduced, and the consistency of the imaging performance of the wide-angle lens at different temperatures is ensured.

In one embodiment, the wide-angle lens satisfies the following relationship: 0 < | RS11/D6| < 4;

wherein RS11 denotes a radius of curvature of the object-side surface of the sixth lens at the optical axis, and D6 denotes a thickness of the sixth lens on the optical axis.

Through carrying out reasonable setting to the curvature radius of sixth lens objective side in optical axis department and the thickness of sixth lens on the optical axis, can restrain the aberration when effective control sixth lens bending degree, optimize the wide angle imaging quality of camera lens.

In one embodiment, the wide-angle lens satisfies the following relationship: 12mm < TTL/tan (1/2FOV) < 21 mm; 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 wide-angle lens, and FOV represents a field angle in a diagonal direction of the wide-angle lens.

By controlling the total length of the wide-angle lens and the field angle of the wide-angle lens in the diagonal direction to satisfy the above relationship, both the wide angle and miniaturization of the lens are facilitated.

In one embodiment, the wide-angle lens satisfies the following relationship: imgH/f is more than 0 and less than 3; wherein ImgH represents a diagonal length of an effective pixel area on an imaging surface of the wide-angle lens, and f represents an effective focal length of the wide-angle lens.

Through the image height of the reasonable wide-angle lens diagonal direction and the effective focal length of the wide-angle lens, the optical performance of the lens can be more stable, and therefore the imaging quality of high pixels is guaranteed while the miniaturization characteristic is met.

The application also provides an imaging module.

The utility model provides an imaging module, includes as aforesaid wide-angle lens and photosensitive element, photosensitive element locates the image side of wide-angle lens.

Above-mentioned imaging module utilizes aforementioned wide-angle lens can shoot and obtain high-definition, the wide image of visual angle, and imaging module still has miniaturized, lightweight structural feature simultaneously, makes things convenient for the adaptation to like the limited device of size such as cell-phone, flat board and on-vehicle lens.

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 and high pixel 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 view showing a wide-angle lens according to embodiment 1 of the present application;

fig. 2 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 1, respectively;

fig. 3 is a schematic structural view showing a wide-angle lens according to embodiment 2 of the present application;

fig. 4 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 2, respectively;

fig. 5 is a schematic structural view showing a wide-angle lens according to embodiment 3 of the present application;

fig. 6 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 3, respectively;

fig. 7 is a schematic structural view showing a wide-angle lens according to embodiment 4 of the present application;

fig. 8 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the wide-angle lens of example 4;

fig. 9 is a schematic structural view showing a wide-angle lens according to embodiment 5 of the present application;

fig. 10 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the wide-angle lens of example 5;

fig. 11 is a schematic structural view showing a wide-angle lens according to embodiment 6 of the present application;

fig. 12 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 6, respectively;

fig. 13 is a schematic structural view showing a wide-angle lens according to embodiment 7 of the present application;

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

FIG. 15 shows a schematic view of an imaging module according to an embodiment of the present application;

FIG. 16 is a schematic view of a driving device using an imaging module according to an embodiment of the present disclosure;

fig. 17 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.

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 high-pixel wide-angle lens can clearly present captured scene information on a photosensitive surface of the photosensitive element and transmit the captured scene information to a corresponding system for recognition processing, and plays an important role in a reversing system, an automatic driving system and a monitoring system. However, the conventional vehicle-mounted lens is difficult to design with both miniaturization and high resolution, so that the lens is high in preparation cost and difficult to produce in batch.

The defects existing in the above solutions are the results obtained after the inventor has practiced and studied carefully, so the discovery process of the above problems and the solutions proposed by the following embodiments of the present application for the above problems should be the contribution of the inventor to the present application in the process of the present application.

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, and fig. 13, the present invention provides a wide-angle lens that can achieve both high pixel and miniaturization. Specifically, the wide-angle 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 the object side to the image side along the optical axis, and the imaging surface of the wide-angle lens is positioned on the image side of the sixth lens.

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, so that large-angle light can enter the optical system, and the light can be converged to an imaging surface of the system by refraction of other lens elements in the optical system, thereby improving imaging quality.

The second lens element with negative refractive power has a concave object-side surface. The curvature radius of the object side surface and the curvature radius of the image side surface of the second lens are adjusted to be beneficial to correcting the edge aberration generated by part of the first lens, and the wide-angle imaging quality of the lens is optimized; meanwhile, the method is also beneficial to inhibiting the generation of astigmatism, and further improves the imaging quality.

The third lens has positive refractive power, so that light rays diverged by strong 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, the structure of the lens is more compact, and the miniaturization of the lens system is easy to realize.

The fourth lens element has negative refractive power, and the fifth lens element has positive refractive power, so that the fifth lens element can be used in combination with the fourth lens element to correct chromatic aberration of the lens assembly, further correct aberration, and improve imaging resolution of the lens assembly. Furthermore, the image side surface of the fourth lens is a concave surface, the object side surface of the fifth lens is a convex surface, and the image side surface of the fourth lens and the object side surface of the fifth lens can be glued, so that the whole structure of the wide-angle lens is more compact, aberration can be corrected, balance is obtained between the volume of the reduced lens and the image resolving power of the lens, meanwhile, the tolerance sensitivity problems such as inclination 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 correction of the whole chromatic aberration and aberration of the lens can be shared, and the resolving power of the wide-angle 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 fourth lens with negative refractive power and the fifth lens with positive refractive power.

The sixth lens element has positive refractive power, and is beneficial to reducing the emergent angle of a chief ray, reducing the angle of the ray incident on the chip and improving the photosensitive performance of the photosensitive element; and simultaneously, the miniaturization characteristic of the lens is also favorably ensured. The wide-angle lens is also provided with a diaphragm, and the diaphragm is arranged at the object side of the wide-angle 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 wide-angle 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.

Further, the wide-angle lens satisfies the following relation: -2X 10^-6/k＜dn5/dt5＜4.5×10^-6K is; wherein dn5/dt5 represents the temperature coefficient of relative refractive index of the fifth lens in the range of 20-40 ℃. Specifically, dn5/dt5 can be-1.5X 10^-6/k、-1×10^-6/k、0.5×10^-6/k、2×10^-6/k、3×10^-6/k、4×10^-6/k、4.2×10^-6K or 4.3X 10^-6K is the sum of the values of k and k. The fifth lens element can be made to satisfy the above relational expressionThe effective focal length of the lens meets the characteristics of high-temperature elongation and low-temperature shortening, thereby being beneficial to compensating the refractive index change of other lenses, reducing the influence of temperature change on the resolution capability of the lens and ensuring the consistency of the imaging performance of the wide-angle lens at different temperatures. When dn5/dt5 is lower than the lower limit or higher than the upper limit, the refractive index of the fifth lens is greatly influenced by temperature change, so that the resolution capability of the lens is greatly influenced by temperature, and the imaging quality is easily reduced.

When the wide-angle lens is used for imaging, light rays emitted or reflected by a shot object enter the wide-angle 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 wide-angle lens, the refractive power and the surface shape of each lens and the effective focal length of each lens are reasonably distributed by selecting a proper number of lenses, so that the imaging analysis capability of the wide-angle lens can be enhanced, the aberration can be effectively corrected, and the details of a scene can be captured more accurately; meanwhile, the influence of temperature change on the resolution capability of the lens is compensated through the temperature coefficient of the relative refractive index of the fifth lens, and the consistency of the imaging performance of the wide-angle lens at different temperatures is ensured.

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 wide-angle lens is improved.

In an exemplary embodiment, the fourth lens and the fifth lens are cemented, and the wide-angle lens satisfies the following relation: r45 > 0; where R45 denotes a radius of curvature of a cemented surface of the fourth lens and the fifth lens at the optical axis. R45 may be 2.3mm, 2.4mm, 2.45mm, 2.5mm, 2.55mm, 2.6mm, 2.65mm or 2.7 mm. The fourth lens and the fifth lens are glued, so that the overall structure of the wide-angle lens is more compact, the tolerance sensitivity problems such as inclination or eccentricity and the like generated in the assembling process of the lens are reduced, and the assembling 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 wide-angle lens satisfies the following relationship: -4 < f1/f < 0; where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the wide-angle lens. f1/f can be-3, -2.9, -2.8, -2.7, -2.6, -2.5, -2.4, -2, -1.5, -1.3 or-1. Under the condition that the relation formula is satisfied, negative refractive power can be provided for the lens, and by satisfying the upper limit of the condition formula, the negative refractive power of the first lens does not become too strong, so that the generation of high-order aberration caused by the light beam at the periphery of the imaging area is favorably inhibited; by satisfying the lower limit of the conditional expression, the negative refractive power of the first lens element can be ensured, thereby suppressing a decrease in the achromatic effect and providing the lens with high resolution performance.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: f123/f is more than 0 and less than 4; where f123 denotes a combined focal length of the first lens, the second lens, and the third lens, and f denotes an effective focal length of the wide-angle lens. f123/f can be 0.5, 1, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.5, 3, or 3.5. Under the condition that satisfies above-mentioned relational expression, be favorable to rationally setting up the effective focal length of first lens, second lens and third lens to can make the structure of camera lens more compact, when guaranteeing wide visual angle and low sensitivity, realize the miniaturization. When f123/f is less than 0, positive refractive power cannot be provided, which is not favorable for convergence of light; when f123/f is greater than or equal to 4, the positive refractive power of f123 is too strong, which is not favorable for correcting the high-order aberration.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0 < (RS2-RS1)/f1 < 1; wherein RS1 denotes the radius of curvature of the object-side surface of the first lens at the optical axis, RS2 denotes the radius of curvature of the image-side surface of the first lens at the optical axis, and f1 denotes the effective focal length of the first lens. (RS2-RS1)/f1 may be 0.2, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.4, 0.6, or 0.8. When satisfying above-mentioned relation, can rationally set up the curvature radius of first lens object side and image side to reduce the processing degree of difficulty of lens, reduce the eccentric risk in the course of working. When (RS2-RS1)/f1 is less than or equal to 0, the curvature radius of the image side surface of the first lens is too large, which is not beneficial to light collection and aberration correction; when (RS2-RS1)/f1 is 1 or more, the difference in the degree of curvature between the object-side surface and the image-side surface of the first lens is increased, the difficulty of processing is increased, and the risk of decentering during processing is easily increased.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship:

-6 < (RS3+ RS4)/(RS3-RS4) < 2; 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-5.5, -5.4, -5.3, -5.2, -5.1, -5, -3, -1, 1.3 or 1.5. When the lower limit of the relational expression is met, the incidence angle of the chief ray of the marginal field of view is favorably reduced, so that the lens is better matched with the photosensitive element, and the imaging quality is improved; when the upper limit of the above relational expression is satisfied, astigmatism can be suppressed advantageously, and the imaging quality can be further improved.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 5 < | RS6|/| RS5| < 11; wherein RS5 denotes the radius of curvature of the object-side surface of the third lens at the optical axis, and RS6 denotes the radius of curvature of the image-side surface of the third lens at the optical axis. | RS6|/| RS5| may be 5.2, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, or 10.5. When the relation is satisfied, the curvature radius of the object side surface and the curvature radius of the image side surface of the third lens can be reasonably set, so that the bending degree of the lens is favorably controlled, the processing difficulty of the lens is reduced, and the eccentric risk in the processing process is reduced. When the absolute value of RS 6/absolute value of RS5 is greater than the upper limit or lower than the lower limit, the difference between the bending degrees of the object-side surface and the image-side surface of the third lens is too large, which increases the processing difficulty of the lens and increases the risk of decentering during the processing.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 4 < TTL/Sigma D < 5; wherein, TTL represents a distance on the optical axis from the object-side surface of the first lens element to the image plane of the wide-angle lens, and Σ D represents a sum of distances on the optical axis from the image-side surface of the preceding lens element to the object-side surface of the subsequent lens element in each of the adjacent first to sixth lens elements. TTL/. sigma.D can be 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, or 4.9. When the relationship is met, the air intervals between every two adjacent lenses can be reasonably configured, so that the structure of the lens is more compact, and the miniaturization of the lens is realized; meanwhile, the arrangement is also beneficial to increasing the thermal stability of the lens. When TTL/Sigma D is less than or equal to 4, the distance between every two adjacent lenses is large, lens assembly is not facilitated, and generation of ghost images is not reduced; when TTL/Σ D is greater than or equal to 5, the total lens length is large, which is not conducive to miniaturization.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: f456/f < 5 is more than 1; where f456 denotes a combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f denotes an effective focal length of the wide-angle lens. f456/f may be 1.4, 1.8, 1.9, 2.0, 2.1, 2.2, 2.5, 3, 3.5, 4, 4.5, or 4.8. When the above relationship is satisfied, the fourth lens element, the fifth lens element and the sixth lens element can provide positive refractive power for the lens integrally, and the refractive powers of the respective lens elements are reasonably configured according to the above relationship, which is beneficial to reducing the sensitivity of the system, improving the yield of production, ensuring the miniaturization characteristic of the system, and simultaneously, also beneficial to correcting aberration, and achieving a balance between reducing the volume lens power and improving the resolution of the lens. When f456/f exceeds the lower limit or the upper limit, it is not favorable for the miniaturization of the lens and the aberration correction of the lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: vd3 is more than 40, Vd5 is more than 40; vd3 represents the d-ray abbe number of the third lens, and Vd5 represents the d-ray abbe number of the fifth lens. Specifically, d-light refers to light having a wavelength of 587.56 nm. Vd3 may be 42, 44, 46, 48, 50, or 52, and Vd5 may be 42, 44, 46, 48, 50, 51, 52, 54, or 55. The d-ray abbe numbers of the third lens and the fifth lens are controlled to meet the relation, so that the off-axis chromatic aberration of the lens can be corrected, the resolution of the lens is improved, and the imaging definition is ensured.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: -2X 10^-6/k＜dn5/dt5＜-0.1×10^-6K is the sum of the values of k and k. The temperature coefficient of the relative refractive index of the fifth lens within the range of 20-40 ℃ is controlled to further meet the relationship, so that the refractive index change of the lens at different temperatures can be well compensated, and the temperature is reducedThe influence of the degree change on the resolving power of the lens ensures the consistency of the imaging performance of the wide-angle lens at different temperatures.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0 < | RS11/D6| < 4; where RS11 denotes a radius of curvature of the object-side surface of the sixth lens at the optical axis, and D6 denotes a thickness of the sixth lens on the optical axis. | RS11/D6| can be 1, 2, 3, 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, 3.6, or 3.8. Through carrying out reasonable setting to the curvature radius of sixth lens objective side in optical axis department and the thickness of sixth lens on the optical axis, can restrain the aberration when effective control sixth lens bending degree, optimize the wide angle imaging quality of camera lens. When the ratio of RS11/D6 is greater than or equal to 4, the object side of the sixth lens element is easily over-bent, which increases the difficulty of lens processing and is also not favorable for suppressing lens aberration.

12mm < TTL/tan (1/2FOV) < 21 mm; 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 wide-angle lens, and FOV represents a diagonal field angle of the wide-angle lens. TTL/tan (1/2FOV) can be 12.1mm, 12.2mm, 12.3mm, 12.4mm, 12.5mm, 12.6mm, 12.7mm, 15mm, 18mm, 20mm, or 20.5 mm. Under the condition of satisfying the relation, the wide angle and the miniaturization of the lens can be better considered.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: imgH/f is more than 0 and less than 3; where ImgH represents a diagonal length of an effective pixel area on an imaging surface of the wide-angle lens, and f represents an effective focal length of the wide-angle lens. ImgH/f may be 1, 1.1, 1.2, 1.25, 1.3, 1.4, 1.5, 2 or 2.5. Through the image height of the reasonable wide-angle lens diagonal direction and the effective focal length of the wide-angle lens, the optical performance of the lens can be more stable, and therefore the imaging quality of high pixels is guaranteed while the miniaturization characteristic is met.

In an exemplary embodiment, each lens in the wide-angle lens may be made of glass or plastic, the plastic lens can reduce the weight and production cost of the wide-angle lens, and the glass lens can provide the wide-angle lens with good temperature tolerance characteristics and excellent optical performance. Further, when the lens is used for a vehicle, the material of each lens is preferably glass. It should be noted that the material of each lens in the wide-angle lens may also be any combination of glass and plastic, and is not necessarily all glass or all plastic.

In an exemplary embodiment, the wide-angle lens further includes an infrared filter. The infrared filter is arranged on 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 wide-angle lens is improved.

In an exemplary embodiment, the wide-angle lens further includes a protective glass. The protective glass is arranged on the image side of the infrared filter, so that the protective glass can be close to the photosensitive element when a module is assembled subsequently, and the effect of protecting the photosensitive element is achieved. The photosensitive element is positioned on the imaging surface of the wide-angle lens. Further, the image forming surface may be a photosensitive surface of a photosensitive element.

The wide-angle lens of the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. Through rational distribution of focal length, refractive power, surface type, thickness of each lens and on-axis distance between each lens, the total length of the wide-angle lens is small, the weight is light, the wide-angle lens has high imaging resolution, and the wide-angle lens also has a large aperture (FNO can be 1.6) 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 plate of a vehicle-mounted auxiliary system are better met. However, it will be appreciated by those skilled in the art that the number of lenses making up the wide-angle lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter.

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

Example 1

The wide-angle lens 100 of embodiment 1 of the present application is described below with reference to fig. 1 to 2.

Fig. 1 shows a schematic configuration diagram of a wide-angle lens 100 of embodiment 1. As shown in fig. 1, the wide-angle 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 an object-side surface S1 and an image-side surface S2 that are aspheric, wherein the object-side surface S1 is convex at a paraxial region thereof and the image-side surface S2 is concave at a paraxial region thereof.

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 negative refractive power has a planar object-side surface S7 and a spherical image-side surface S8, wherein the image-side surface S8 is concave.

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 convex and the image-side surface S10 is convex.

The sixth lens element L6 with positive 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 image side surface S8 of the fourth lens element L4 and the object side surface S9 of the fifth lens element L5 are cemented together to form a cemented lens, so that the overall structure of the wide-angle 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 and the image-side surface of the first lens L1 and the sixth lens L6 are both aspheric, which is advantageous for correcting aberrations and solving the problem of image surface distortion, and enables the lenses to achieve excellent optical imaging effects even when the lenses are small, thin, and flat, thereby enabling the wide-angle lens 100 to have a compact size.

The first lens L1 to the sixth lens L6 are made of glass, and the wide-angle lens 100 has good temperature resistance and excellent optical performance by using the glass lens.

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 wide-angle lens 100. The wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object-side surface S13 and an image-side surface S14, and a cover 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 wide-angle lens 100, so as to avoid imaging distortion. Specifically, the material of the filter 110 is glass. The filter 110 and the cover glass 120 may be part of the wide-angle lens 100, and may be assembled together with the respective lenses, or may be assembled together when the wide-angle lens 100 is assembled with the photosensitive elements.

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 wide-angle lens 100 of example 1, where the unit of the radius of curvature, thickness, and effective focal length of the lens is millimeters (mm). The surface of the lens closest to the object is called the object side surface, and the surface of the lens closest to the image plane is called the image side surface. 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 lens aspheres S1-S2 and S11-S12 in example 1.

TABLE 2

As can be seen from the data in tables 1 and 2, the wide-angle lens 100 in embodiment 1 satisfies:

dn5/dt5＝-1.2×10^-6the temperature coefficient of the relative refractive index of the fifth lens L5 is represented by dn5/dt5 in the range of 20-40 ℃;

r45 ═ 2.631mm, where R45 denotes a radius of curvature of the cemented surfaces of the fourth lens L4 and the fifth lens L5 at the optical axis;

f1/f — 1.374, where f1 denotes an effective focal length of the first lens L1, and f denotes an effective focal length of the wide-angle lens 100;

f123/f is 0.986, where f123 denotes a combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f denotes an effective focal length of the wide-angle lens 100;

(RS2-RS1)/f1 ═ 0.62, where RS1 denotes the radius of curvature of the object side surface S1 of the first lens L1 at the optical axis, RS2 denotes the radius of curvature of the image side surface S2 of the first lens L1 at the optical axis, and f1 denotes the effective focal length of the first lens L1;

(RS3+ RS4)/(RS3-RS4) ═ 1.399, where RS3 denotes the radius of curvature of the object side S3 of the second lens L2 at the optical axis, and RS4 denotes the radius of curvature of the image side S4 of the second lens L2 at the optical axis;

RS 6/| RS5| ═ 5.273, where RS5 denotes the radius of curvature of the object-side surface S5 of the third lens L3 at the optical axis, and RS6 denotes the radius of curvature of the image-side surface S6 of the third lens L3 at the optical axis;

TTL/Σ D is 4.852, where TTL denotes a distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens 100, and Σ D denotes a sum of 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 lens L1 to the sixth lens L6;

4.702, where f456 denotes a combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6, and f denotes an effective focal length of the wide-angle lens 100;

vd3 is 51.1, and Vd5 is 51.1, where Vd3 denotes the d-ray abbe number of the third lens L3, and Vd5 denotes the d-ray abbe number of the fifth lens L5;

RS11/D6| ═ 3.361, where RS11 denotes the radius of curvature of the object-side surface S11 of the sixth lens L6 at the optical axis, and D6 denotes the thickness of the sixth lens L6 on the optical axis;

TTL/tan (1/2FOV) ═ 20.134mm, where TTL denotes the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens 100, TTL is 24mm in this embodiment, and FOV denotes the diagonal field angle of the wide-angle lens 100;

ImgH/f is 1.106, where ImgH represents the diagonal length of the effective pixel area on the imaging plane S17 of the wide-angle lens 100, and in the embodiment, ImgH is 5.762mm, and f represents the effective focal length of the wide-angle lens 100.

Fig. 2 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 1, respectively, with wide-angle lens 100 having a reference wavelength of 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 2, the wide-angle lens 100 according to embodiment 1 can achieve good imaging quality.

Example 2

The wide-angle 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 wide-angle lens 100 according to embodiment 2 of the present application.

As shown in fig. 3, the wide-angle 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 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 concave.

The fourth lens element L4 with negative refractive power has a spherical object-side surface S7 and a spherical image-side surface S8, wherein the object-side surface S7 is convex and the image-side surface S8 is concave.

The object-side surface and the image-side surface of the first lens L1 and the sixth lens L6 are both aspheric, the first lens L1 to the sixth lens L6 are all made of glass, and a stop STO is further provided between the third lens L3 and the fourth lens L4. The wide-angle lens 100 further includes a filter 110 disposed on the image side of the sixth lens L6 and having an object-side surface S13 and an image-side surface S14, and a cover 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 wide-angle lens 100, so as to avoid imaging 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 wide-angle lens 100 of example 2, where the unit of 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 S1-S2 and S11-S12 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 the relevant parameters of the wide-angle lens 100 given in embodiment 2.

TABLE 3

TABLE 4

TABLE 5

Fig. 4 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens 100 of example 2, respectively, and the reference wavelength of the wide-angle lens 100 is 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 4, the wide-angle lens 100 according to embodiment 2 can achieve good imaging quality.

Example 3

The wide-angle 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 wide-angle lens 100 according to embodiment 3 of the present application.

As shown in fig. 5, the wide-angle 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 wide-angle lens 100 of example 3, where the unit of 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 aspheres S1-S2 and S11-S12 in example 3, in which the aspherical surface types can be defined by formula (1) given in example 1; table 8 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 3.

TABLE 6

TABLE 7

TABLE 8

Fig. 6 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 3, respectively, with wide-angle lens 100 having a reference wavelength of 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 6, the wide-angle lens 100 according to embodiment 3 can achieve good imaging quality.

Example 4

The wide-angle 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 wide-angle lens 100 according to embodiment 4 of the present application.

As shown in fig. 7, the wide-angle 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 fifth lens element L5 with positive refractive power has a spherical object-side surface S9 and a planar image-side surface S10, wherein the object-side surface S9 is convex.

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 wide-angle lens 100 of example 4, where the unit of 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 aspheres S1-S2 and S11-S12 in embodiment 4, in which the aspherical surface types can be defined by formula (1) given in embodiment 1; table 11 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 4.

TABLE 9

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TABLE 11

Fig. 8 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 4, respectively, with wide-angle lens 100 having a reference wavelength of 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 8, the wide-angle lens 100 according to embodiment 4 can achieve good imaging quality.

Example 5

The wide-angle 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 wide-angle lens 100 according to embodiment 5 of the present application.

As shown in fig. 9, the wide-angle 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 wide-angle lens 100 of example 5, where the unit of 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 aspheres S1-S2 and S11-S12 in example 5, in which the aspherical surface types can be defined by formula (1) given in example 1; table 14 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 5.

TABLE 12

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TABLE 14

Fig. 10 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens 100 of example 5, respectively, and the reference wavelength of the wide-angle lens 100 is 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 10, the wide-angle lens 100 according to embodiment 5 can achieve good imaging quality.

Example 6

The wide-angle 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 wide-angle lens 100 according to embodiment 6 of the present application.

As shown in fig. 11, the wide-angle 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 wide-angle lens 100 of example 6, where the unit of 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 aspheres S1-S2 and S11-S12 in example 6, in which the aspherical surface types can be defined by formula (1) given in example 1; table 17 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 6.

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TABLE 16

TABLE 17

Fig. 12 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of wide-angle lens 100 of example 6, respectively, with wide-angle lens 100 having a reference wavelength of 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 12, the wide-angle lens 100 according to embodiment 6 can achieve good imaging quality.

Example 7

The wide-angle 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 view showing wide-angle lens 100 according to embodiment 7 of the present application.

As shown in fig. 13, the wide-angle 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 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 wide-angle lens 100 of example 7, where the unit of 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 aspheres S1-S2 and S11-S12 in example 7, in which the aspherical surface types can be defined by formula (1) given in example 1; table 20 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 7.

Watch 18

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Watch 20

Fig. 14 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of wide-angle lens 100 of example 7, respectively, with wide-angle lens 100 having a reference wavelength of 546.07 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 430nm, 479.99nm, 546.07nm, 587.56nm, and 656.27nm through the wide-angle 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 wide-angle 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 wide-angle lens 100. As can be seen from fig. 14, the wide-angle lens 100 according to embodiment 7 can achieve good imaging quality.

As shown in fig. 15, the present application further provides an imaging module 200, which includes the wide-angle lens 100 as described above; and a light receiving element 210, the light receiving element 210 being disposed on the image side of the wide-angle lens 100, a light receiving surface of the light receiving element 210 coinciding 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 high-definition and wide-angle images by using the wide-angle 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. 16, 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. 16, 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-described 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. 17, 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 and a high pixel height 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. A wide-angle lens, comprising, 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;

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

a third lens element with positive refractive power;

a fourth lens element with negative refractive power having a concave image-side surface;

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

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

the diaphragm is arranged on the object side of the wide-angle lens or between the first lens and the sixth lens;

the wide-angle lens satisfies the following relation:

-2×10^-6/k＜dn5/dt5＜4.5×10^-6/k；

wherein dn5/dt5 represents the temperature coefficient of relative refractive index of the fifth lens in the range of 20-40 ℃.

2. The wide-angle lens of claim 1, wherein at least one of the first to sixth lenses has an object-side surface and/or an image-side surface that is aspheric.

3. The wide-angle lens of claim 1, wherein the fourth lens and the fifth lens are cemented, and the wide-angle lens satisfies the following relationship:

R45＞0；

wherein R45 denotes a radius of curvature of a cemented surface of the fourth lens and the fifth lens at an optical axis, in mm.

4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

-4＜f1/f＜0；

where f1 denotes an effective focal length of the first lens, and f denotes an effective focal length of the wide-angle lens.

5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0＜f123/f＜4；

wherein f123 denotes a combined focal length of the first lens, the second lens, and the third lens, and f denotes an effective focal length of the wide-angle lens.

6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0＜(RS2-RS1)/f1＜1；

wherein RS1 represents the radius of curvature of the first lens object side surface at the optical axis, RS2 represents the radius of curvature of the first lens image side surface at the optical axis, and f1 represents the effective focal length of the first lens.

7. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

-6＜(RS3+RS4)/(RS3-RS4)＜2；

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.

8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

5＜|RS6|/|RS5|＜11；

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

9. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

4＜TTL/∑D＜5；

10. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

1＜f456/f＜5；

wherein f456 represents a combined focal length of the fourth lens, the fifth lens, and the sixth lens, and f represents an effective focal length of the wide-angle lens.

11. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

Vd3＞40，Vd5＞40；

12. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship: -2X 10^-6/k＜dn5/dt5＜-0.1×10^-6/k。

13. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0＜|RS11/D6|＜4；

14. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

12mm＜TTL/tan(1/2FOV)＜21mm；

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 wide-angle lens, and FOV represents a field angle in a diagonal direction of the wide-angle lens.

15. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0＜ImgH/f＜3；

wherein ImgH represents a diagonal length of an effective pixel area on an imaging surface of the wide-angle lens, and f represents an effective focal length of the wide-angle lens.

16. An imaging module comprising the wide-angle lens according to any one of claims 1 to 15, and a photosensitive element disposed on an image side of the wide-angle 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.