阅读说明：本技术 光学镜头 (Optical lens ) 是由 徐超 张绍鹏 杨佳 于 2018-06-27 设计创作，主要内容包括：本申请公开了一种光学镜头,该光学镜头沿着光轴由物侧至像侧依序可包括：第一透镜、第二透镜、第三透镜、第四透镜、第五透镜和第六透镜。其中,第一透镜可具有正光焦度；第二透镜可具有负光焦度,其物侧面为凸面,像侧面为凹面；第三透镜可具有正光焦度,其物侧面为凹面,像侧面为凸面；第四透镜可具有正光焦度,其物侧面和像侧面均为凸面；第五透镜可具有正光焦度,其物侧面和像侧面均为凸面；以及第六透镜可具有正光焦度,其物侧面和像侧面均为凸面。根据本申请的光学镜头,可实现高解像、小畸变、小FNO、主光线角小、热稳定性强等中的至少一个有益效果。(The present application discloses an optical lens, which sequentially comprises, from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Wherein the first lens may have a positive optical power; the second lens can have negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens can have positive focal power, and the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens can have positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; and the sixth lens element may have a positive optical power, and both the object-side surface and the image-side surface thereof are convex. According to the optical lens, at least one beneficial effect of high resolution, small distortion, small FNO, small chief ray angle, strong thermal stability and the like can be realized.)

1. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens,

it is characterized in that the preparation method is characterized in that,

the first lens has positive optical power;

the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces;

the fifth lens has positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; and

the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces.

2. An optical lens barrel according to claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface.

3. An optical lens barrel according to claim 1, wherein the object side surface of the first lens element is convex and the image side surface is flat.

4. An optical lens barrel according to claim 1, wherein the object-side surface and the image-side surface of the first lens are convex.

5. An optical lens according to claim 1, characterized in that the third lens and the sixth lens are both aspherical lenses.

6. An optical lens according to any one of claims 1 to 5, characterized in that a combined focal length value F12 of the first and second lenses and a full set of focal length values F of the optical lens satisfy: F12/F is less than or equal to-1.5.

7. An optical lens according to any one of claims 1 to 5, characterized in that the radius of curvature of the object-side surface of the third lens R6, the radius of curvature of the image-side surface of the third lens R7 and the thickness of the third lens d6 satisfy: 1.2 is less than or equal to (R6-d6)/R7 is less than or equal to 1.7.

8. An optical lens according to any one of claims 1 to 5, characterized in that a focal length value F3 of the third lens and a focal length value F6 of the sixth lens satisfy: F3/F6 is more than or equal to 1 and less than or equal to 2.1.

9. An optical lens according to any one of claims 1 to 5, characterized in that a focal length value F4 of the fourth lens and a focal length value F5 of the fifth lens satisfy: F4/F5 is more than or equal to 0.8 and less than or equal to 1.3.

10. An optical lens as claimed in claim 9, characterized in that the radius of curvature of the object-side surface of the fourth lens R8, the thickness of the fourth lens d8, the radius of curvature of the object-side surface of the fifth lens R10 and the thickness of the fifth lens d10 satisfy: not less than 0.6 (R8-d8)/(R10-d10) not more than 1.

11. An optical lens according to any one of claims 1 to 5, characterized in that the radius of curvature of the object-side surface of the fourth lens R8, the thickness of the fourth lens d8, the radius of curvature of the object-side surface of the fifth lens R10 and the thickness of the fifth lens d10 satisfy between: not less than 0.6 (R8-d8)/(R10-d10) not more than 1.

12. The optical lens sequentially comprises from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens,

it is characterized in that the preparation method is characterized in that,

the first lens has positive focal power, and the object side surface of the first lens is a convex surface;

the second lens has a negative optical power;

the third lens, the fourth lens, the fifth lens and the sixth lens each have a positive optical power; and

the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy that: F4/F5 is more than or equal to 0.8 and less than or equal to 1.3.

Technical Field

The present application relates to an optical lens, and more particularly, to an optical lens including six lenses.

Background

The optical lens is an important component for realizing unmanned driving. For some lens applications, it is generally desirable that the lens FNO be smaller in order to collect more light. For some specific lenses, a higher resolution is generally required for image clarity. However, in general, the smaller the FNO, the more blurred the imaging, and thus it is difficult to achieve a high resolution for a lens having a small FNO.

The application aims to provide the optical lens which can realize high resolution simultaneously besides the characteristic of ensuring the FNO to be small.

Disclosure of Invention

The present application provides an optical lens that is adaptable for on-board installation and that overcomes, at least in part, at least one of the above-identified deficiencies in the prior art.

An aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Wherein the first lens may have a positive optical power; the second lens can have negative focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens can have positive focal power, and the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens can have positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens can have positive focal power, and both the object side surface and the image side surface of the fifth lens are convex surfaces; and the sixth lens element may have a positive optical power, and both the object-side surface and the image-side surface thereof are convex.

In one embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be concave.

In another embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be planar.

In yet another embodiment, both the object-side surface and the image-side surface of the first lens can be convex.

In one embodiment, the third lens and the sixth lens may each be an aspheric lens.

In one embodiment, the combined focal length value F12 of the first lens and the second lens and the entire set of focal length values F of the optical lens may satisfy: F12/F is less than or equal to-1.5.

In one embodiment, the radius of curvature R6 of the object-side surface of the third lens, the radius of curvature R7 of the image-side surface of the third lens, and the thickness d6 of the third lens may satisfy: 1.2 is less than or equal to (R6-d6)/R7 is less than or equal to 1.7.

In one embodiment, the focal length value F3 of the third lens and the focal length value F6 of the sixth lens may satisfy: F3/F6 is more than or equal to 1 and less than or equal to 2.1.

In one embodiment, the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy: F4/F5 is more than or equal to 0.8 and less than or equal to 1.3. Further, or alternatively, the radius of curvature of the object-side surface of the fourth lens, R8, the thickness of the fourth lens, d8, the radius of curvature of the object-side surface of the fifth lens, R10, and the thickness of the fifth lens, d10, may satisfy between: not less than 0.6 (R8-d8)/(R10-d10) not more than 1.

Another aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have a negative optical power; the third lens, the fourth lens, the fifth lens and the sixth lens can all have positive focal power; and the focal length value F4 of the fourth lens and the focal length value F5 of the fifth lens satisfy that: F4/F5 is more than or equal to 0.8 and less than or equal to 1.3.

In one embodiment, the image side surface of the first lens may be concave.

In another embodiment, the image side surface of the first lens can be a plane.

In yet another embodiment, the image-side surface of the first lens element can be convex.

In one embodiment, the object-side surface of the second lens element can be convex and the image-side surface can be concave.

In one embodiment, the object-side surface of the third lens element can be concave and the image-side surface can be convex.

In one embodiment, both the object-side surface and the image-side surface of the fourth lens can be convex.

In one embodiment, both the object-side surface and the image-side surface of the fifth lens can be convex.

In one embodiment, both the object-side surface and the image-side surface of the sixth lens element can be convex.

In one embodiment, the third lens and the sixth lens may each be an aspheric lens.

In one embodiment, the combined focal length value F12 of the first lens and the second lens and the entire set of focal length values F of the optical lens may satisfy: F12/F is less than or equal to-1.5.

In one embodiment, the radius of curvature R6 of the object-side surface of the third lens, the radius of curvature R7 of the image-side surface of the third lens, and the thickness d6 of the third lens may satisfy: 1.2 is less than or equal to (R6-d6)/R7 is less than or equal to 1.7.

In one embodiment, the focal length value F3 of the third lens and the focal length value F6 of the sixth lens may satisfy: F3/F6 is more than or equal to 1 and less than or equal to 2.1.

In one embodiment, the radius of curvature R8 of the object-side surface of the fourth lens, the thickness d8 of the fourth lens, the radius of curvature R10 of the object-side surface of the fifth lens, and the thickness d10 of the fifth lens may satisfy: not less than 0.6 (R8-d8)/(R10-d10) not more than 1.

The optical lens adopts six lenses, the shape of the lenses is set through optimization, the focal power of each lens is distributed reasonably, and at least one of the beneficial effects of high resolution, miniaturization, small distortion, small chief ray angle, small FNO, strong thermal stability and the like of the optical lens is realized.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

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

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

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

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent 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.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, 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.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. 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.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

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

An optical lens according to an exemplary embodiment of the present application includes, for example, six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in order from the object side to the image side along the optical axis.

The optical lens according to the exemplary embodiment of the present application may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

The first lens element can have a positive optical power, and can have a convex object-side surface and a concave or planar image-side surface. The first lens is arranged in a convex shape towards the object side, so that light rays in a field of view can be collected as much as possible, and the collected light rays are converged into the second lens at the rear part. In practical application, the outdoor installation and use environment of the vehicle-mounted lens is considered, the vehicle-mounted lens can be in severe weather such as rain and snow, the shape design protruding towards the object side is more suitable for environments such as rain and snow, water drops can slide off easily, and the influence of the external environment on imaging is reduced. Furthermore, the first lens can adopt a positive focal length and a large refractive index, for example, the refractive index Nd1 of the material of the first lens is more than or equal to 1.75, which is beneficial to reducing the aperture of the second lens and realizing miniaturization.

The second lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The second lens can make the light trend smoothly transit to the rear system.

The third lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface. The third lens can converge the light, so that the diffused light can smoothly enter the rear system. Furthermore, the third lens can be made of a material with a large refractive index, for example, the refractive index Nd3 of the material of the third lens is larger than or equal to 1.65, so that the distance between the third lens and the rear fourth lens can be favorably reduced, the overall size of the lens is reduced, and the miniaturization is favorably realized.

The fourth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface.

The fifth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface.

The fourth lens can smoothly transit the collected light to the fifth lens.

The sixth lens element can have a positive optical power, and can have a convex object-side surface and a convex image-side surface. The sixth lens can converge light rays and can successfully form images on a chip with a specified size.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between, for example, the second lens and the third lens to further improve the imaging quality of the lens. When the diaphragm is arranged at the position, the front and the rear light rays can be effectively converged, the total length of the optical system is shortened, and the calibers of the front and the rear lens groups are reduced. It should be noted, however, that the positions of the diaphragms disclosed herein are merely examples and not limitations; in alternative embodiments, the diaphragm may be disposed at other positions according to actual needs.

In an exemplary embodiment, the optical lens according to the present application may further include a filter disposed between the sixth lens and the imaging surface to filter light rays having different wavelengths, as necessary; and may further include a protective glass disposed between the optical filter and the imaging surface to prevent internal elements (e.g., chips) of the optical lens from being damaged.

In an exemplary embodiment, a combined focal length value F12 of the first and second lenses and a full set focal length value F of the optical lens may satisfy: F12/F is not more than-1.5, and more preferably, F12/F is not more than-2. When the conditional expression F12/F is less than or equal to-1.5, the second lens can play a role in smooth transition and smoothly transition light rays to a rear system.

In an exemplary embodiment, the radius of curvature R6 of the object-side surface of the third lens, the radius of curvature R7 of the image-side surface of the third lens, and the thickness d6 of the third lens may satisfy: 1.2. ltoreq. R6-d 6)/R7. ltoreq.1.7, more preferably 1.35. ltoreq. R6-d 6)/R7. ltoreq.1.6. The third lens is limited by the special shape, so that the aberration can be reduced, the resolving power can be improved, and the distortion can be reduced.

In an exemplary embodiment, a focal length value F3 of the third lens and a focal length value F6 of the sixth lens may satisfy: F3/F6 of 1. ltoreq. F2.1, more preferably 1.2. ltoreq. F3/F6. ltoreq.1.9. By properly distributing the focal lengths of the two lenses so that the focal length values of the two lenses are substantially identical, optimization of the corrective aberrations and minimization of the CRA (chief ray angle) can be achieved.

In an exemplary embodiment, a focal length value F4 of the fourth lens and a focal length value F5 of the fifth lens may satisfy: F4/F5 of 0.8. ltoreq.1.3, and more preferably, F4/F5 of 0.9. ltoreq.1.2.

In an exemplary embodiment, the radius of curvature of the object-side surface of the fourth lens R8, the thickness of the fourth lens d8, the radius of curvature of the object-side surface of the fifth lens R10, and the thickness of the fifth lens d10 may satisfy: not less than 0.6 (R8-d8)/(R10-d10) not more than 1, more preferably not less than 0.7 (R8-d8)/(R10-d10) not more than 0.95.

As described above, the fourth lens and the fifth lens are designed in a special shape and are configured as two biconvex lenses with similar shapes, and the focal lengths of the two lenses are basically consistent, which can help to reduce FNO of the whole system.

Further, in an exemplary embodiment, a variation dn/dt (4) of the refractive index of the material of the fourth lens with temperature variation may satisfy: i dn/dt (4) | ≥ 5 × 10^-6V. C. With the aid of this arrangement it is possible to,can help the whole system eliminate the heat difference.

In an exemplary embodiment, an optical lens according to the present application may employ an aspherical lens. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved. For example, the third lens may adopt an aspheric lens to reduce aberration and improve resolution quality. The sixth lens element can also adopt an aspheric lens to further improve the image quality and reduce the distortion. Ideally, the third lens and the sixth lens are both aspheric lenses. It is to be understood that other lenses in the optical lens according to the present application may employ aspherical lenses as necessary in order to improve imaging quality.

In an exemplary embodiment, the lens used in the optical lens may be a plastic lens, or may be a glass lens. The lens made of plastic has a large thermal expansion coefficient, and when the ambient temperature change of the lens is large, the lens made of plastic causes a large amount of change of the optical back focus of the lens. The glass lens can reduce the influence of temperature on the optical back focus of the lens.

According to the optical lens of the embodiment of the application, the shape of the lens is optimally set, the focal power is reasonably distributed, the front end aperture can be reduced, the TTL is shortened, the miniaturization of the lens is ensured, and meanwhile, the characteristics of high resolving power, small distortion, small principal ray angle (CRA), strong thermal stability and the like are realized; the third lens and the sixth lens adopt aspheric lenses, and the optical arrangement is favorable for reducing tolerance sensitivity of the lenses and facilitating athermal treatment; the small FNO is facilitated by the specific shape design of the fourth and fifth lenses.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical lens is not limited to including six lenses. The optical lens may also include other numbers of lenses, if desired.

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