CN217060613U - Optical lens assembly - Google Patents

Abstract

The present application provides an optical lens assembly, in order from an object side to an image side along an optical axis comprising: the first lens group with positive focal power sequentially comprises a first lens, a second lens and a third lens which respectively have focal power; a second lens group having negative refractive power, including, in order, a fourth lens, a fifth lens, and a sixth lens each having refractive power; wherein, when the object distance changes, the optical lens group is switched between the first mode and the second mode by adjusting the distance between the first lens group and the second lens group on the optical axis, and a half ImgH of the diagonal line of the effective pixel area on the imaging surface of the optical lens group, a half Semi-FOVi of the maximum field angle of the optical lens group in the first mode, and a half Semi-FOVm of the maximum field angle of the optical lens group in the second mode satisfy: 1< (ImgH × TAN (Semi-FOVi))/(ImgH × TAN (Semi-FOVm)) < 1.1.

Description

Optical lens assembly

Technical Field

The present application relates to the field of optical elements, and more particularly, to an optical lens group.

Background

In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has increased, and under the trend of development of photographic lenses in the fields of miniaturization and high pixel, higher requirements are provided for focusing capability and focusing accuracy in long-shot and close-shot. Although some image processing methods using extended depth of field techniques partially compensate for the deficiencies of physical devices, there are problems of reduced image quality and large power consumption. If a plurality of cameras are arranged on the electronic equipment, for example, a long-focus camera and a common focal length camera are arranged, the focal length of the electronic equipment is changed by switching among the plurality of cameras, but the arrangement of the plurality of cameras occupies a large space of the electronic equipment, and the cost is relatively high.

Therefore, there is a need for an optical system that can improve the focusing problem in the long-distance and close-distance photographing and has the characteristics of miniaturization and low power.

SUMMERY OF THE UTILITY MODEL

An aspect of the present application provides an optical lens assembly, in order from an object side to an image side, comprising: the first lens group with positive focal power sequentially comprises a first lens, a second lens and a third lens which respectively have focal power; a second lens group having negative refractive power, including, in order, a fourth lens, a fifth lens, and a sixth lens each having refractive power; wherein the optical lens group is switched between the first mode and the second mode by adjusting a separation distance of the first lens group and the second lens group on an optical axis when an object distance is changed, and a half ImgH of a diagonal line of an effective pixel area on an imaging plane of the optical lens group, a half Semi-FOVi of a maximum angle of view of the optical lens group in the first mode, and a half Semi-FOVm of a maximum angle of view of the optical lens group in the second mode satisfy: 1< (ImgH × TAN (Semi-FOVi))/(ImgH × TAN (Semi-FOVm)) < 1.1.

In one embodiment of the present application, the second lens group includes a fourth lens, a fifth lens, and a sixth lens each having power, and the optical lens group includes a stop located between an object side of the optical lens group and the third lens.

In one embodiment of the present application, the optical lens group further includes a diaphragm, and the optical lens group satisfies: 3< (TD-SD)/(SL-SD) <3.1, where TD is a distance on the optical axis from an object-side surface of the first lens element to an image-side surface of the sixth lens element, SD is a distance on the optical axis from the diaphragm to an image-side surface of the sixth lens element, and SL is a distance on the optical axis from the diaphragm to an image plane of the optical lens group.

In one embodiment of the present application, the optical lens group satisfies: 1.85< (BFLi × TAN (Semi-FOVi))/(BFLm × TAN (Semi-FOVm)) <1.95, wherein Semi-FOVi is half of the maximum angle of view of the optical lens group in the first mode, Semi-FOVm is half of the maximum angle of view of the optical lens group in the second mode, BFLi is a distance from the image side surface of the sixth lens to an imaging plane of the optical lens group in the first mode on the optical axis, and BFLm is a distance from the image side surface of the sixth lens to the imaging plane of the optical lens group in the second mode on the optical axis.

In one embodiment of the present application, the optical lens group further includes a diaphragm, and the optical lens group satisfies: 1.3 <. DELTA.T/(TD-SD) <1.5, wherein TD is a distance on the optical axis from an object side surface of the first lens element to an image side surface of the sixth lens element, SD is a distance on the optical axis from the diaphragm to the image side surface of the sixth lens element, and DELTA.T is a variation amount of a spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode.

In an embodiment of the present application, a distance TTL between an object side surface of the first lens element and an image plane on the optical axis and an entrance pupil diameter EPD of the optical lens group satisfy: 3.2< TTL/EPD < 3.7.

In one embodiment of the present application, the optical lens group satisfies: 4 <. DELTA.T/(TTL-TD) <4.5, where DELTA.T is a variation of a distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode, TTL is a distance between an object side surface of the first lens and an image plane on the optical axis, and TD is a distance between an object side surface of the first lens and an image side surface of the sixth lens on the optical axis.

In one embodiment of the present application, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, and the focal length f4 of the fourth lens satisfy: 0.1< | (f1+ f2)/(f3+ f4) | < 0.4.

In one embodiment of the present application, a focal length fG1 of the first lens group, a focal length fG2 of the second lens group, a focal length fi of the optical lens group in the first mode, and a focal length fm of the optical lens group in the second mode satisfy: 0.9< | (fG1+ fG2)/(fi-fm) | < 1.2.

In one embodiment of the present application, a maximum value ETmax of the edge thicknesses of the respective first to sixth lenses and a minimum value ETmin of the edge thicknesses of the respective first to sixth lenses satisfy: 1< (ETmax + ETmin)/ETmax < 1.4.

In one embodiment of the present application, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the sum Σ ET of the edge thicknesses of the first to sixth lenses satisfy: 0.45< (ET2+ ET 4)/[ sigma ] ET < 0.6.

In one embodiment of the present application, the second lens group includes a fourth lens and a fifth lens each having a power, wherein a curvature radius R3 of an object side surface of the second lens, a curvature radius R4 of an image side surface of the second lens, a curvature radius R9 of an object side surface of the fifth lens, and a curvature radius R10 of an image side surface of the fifth lens satisfy: 0.9< (R3+ R4)/(R9+ R10) < 1.1.

In one embodiment of the present application, the second lens group includes a fourth lens, a fifth lens and a sixth lens each having a power, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a distance T45 of the fourth lens and the fifth lens on the optical axis, and a distance T56 of the fifth lens and the sixth lens on the optical axis satisfy: 0.8< (CT4+ CT5)/(T45+ T56) < 1.1.

In one embodiment of the present application, the second lens group includes a fourth lens, a fifth lens, and a sixth lens each having power, wherein a distance Tr1r6 on the optical axis from an object side surface of the first lens to an image side surface of the third lens, and a distance Tr7r12 on the optical axis from an object side surface of the fourth lens to an image side surface of the sixth lens satisfy: 0.9< Tr1r6/Tr7r12< 1.1.

In one embodiment of the present application, the optical lens group satisfies: 1< ((. DELTA.T + CTmax)/. SIGMA CT < 1.1), where < DELTA.T is a change amount of a spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode, CTmax is a maximum value of a center thickness of each of the first lens to the sixth lens on the optical axis, and SIGMA CT is a sum of center thicknesses of each of the first lens to the sixth lens on the optical axis.

In one embodiment of the present application, the second lens group includes a fourth lens, a fifth lens, and a sixth lens each having a power, wherein a maximum effective semi-aperture DT11 of an object side surface of the first lens, a maximum effective semi-aperture DT31 of an object side surface of the third lens, a maximum effective semi-aperture DT42 of an image side surface of the fourth lens, and a maximum effective semi-aperture DT62 of an image side surface of the sixth lens satisfy: 1.4< (DT11-DT31)/(DT62-DT42) < 1.9.

In one embodiment of the present application, the second lens includes a fourth lens having optical power, wherein the maximum effective semi-aperture DT31 of the object-side surface of the third lens, the maximum effective semi-aperture DT32 of the image-side surface of the third lens, the maximum effective semi-aperture DT41 of the object-side surface of the fourth lens, and the maximum effective semi-aperture DT42 of the image-side surface of the fourth lens satisfy: 0.95< (DT31/DT41)/(DT32/DT42) <1.

The application adjusts the spacing distance between the second lens group and the first lens group on the optical axis by moving the second lens group, so that the optical lens group is switched between the first mode and the second mode, and the moving focusing are realized. In addition, according to the image forming method and device, the maximum field angle of the first mode and the maximum field angle of the second mode and the image surface of the optical lens group are reasonably distributed, so that the performance balance of the dual lens system is guaranteed, the focusing problem is improved, and the imaging quality is improved. On the other hand, by reasonably distributing the focal length, the surface type, the central thickness of each lens, the distance of each lens on the optical axis and the like of each lens included in the lens group, the optical lens group has at least one beneficial effect of balancing the aberration generated by the lens group at the front end and the lens group at the rear end, realizing miniaturization and the like while meeting the requirement of accurate focusing.

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 structural view showing an optical lens group according to embodiment 1 of the present application in a first mode;

fig. 2 is a schematic structural view showing an optical lens group according to embodiment 1 of the present application in a second mode;

fig. 3A and 3B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 1 in the first mode;

fig. 4A and 4B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 1 in the second mode;

fig. 5 is a schematic structural view showing an optical lens group according to embodiment 2 of the present application in a first mode;

fig. 6 is a schematic structural view showing an optical lens group according to embodiment 2 of the present application in a second mode;

fig. 7A and 7B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 2 in the first mode;

fig. 8A and 8B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 2 in the second mode;

fig. 9 is a schematic structural view showing an optical lens group according to embodiment 3 of the present application in a first mode;

fig. 10 is a schematic structural view showing an optical lens group according to embodiment 3 of the present application in a second mode;

fig. 11A and 11B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 3 in the first mode;

fig. 12A and 12B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 3 in the second mode;

fig. 13 is a schematic structural view showing an optical lens group according to embodiment 4 of the present application in a first mode;

fig. 14 is a schematic structural view showing an optical lens group according to embodiment 4 of the present application in a second mode;

fig. 15A and 15B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 4 in the first mode;

fig. 16A and 16B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 4 in the second mode;

fig. 17 is a schematic structural view showing an optical lens group according to embodiment 5 of the present application in a first mode;

fig. 18 is a schematic structural view showing an optical lens group according to embodiment 5 of the present application in a second mode;

fig. 19A and 19B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 5 in the first mode;

fig. 20A and 20B show axial chromatic aberration curves and distortion curves of the optical lens group of embodiment 5 in the second mode.

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 of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

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, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the 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 following provides a detailed description of the features, principles, and other aspects of the present application.

An optical lens group according to an exemplary embodiment of the present application may include at least two lens groups (e.g., a first lens group and a second lens group), each including at least one lens having power. In some examples, the first lens group includes first, second, and third lenses each having power, and the second lens group includes fourth, fifth, and sixth lenses each having power. The six lenses are arranged in sequence from an object side to an image side along an optical axis. Any adjacent two lenses among the first to sixth lenses may have an air space therebetween. The optical lens assembly may further include optical devices (not shown) for deflecting light, such as a deflecting prism and a mirror. As an example, the turning prism and the mirror may be disposed between the subject and the first lens.

In an exemplary embodiment, the optical lens group may further include at least one diaphragm. The stop may be disposed at an appropriate position as needed to control the amount of light taken in the optical lens group, for example, between the object side of the optical lens group and the third lens, more specifically, between the second lens and the third lens.

In an exemplary embodiment, the first lens group may have positive power, and the second lens group may have negative power. The effect of shooting can be effectively improved by reasonably distributing the focal power of each lens group.

In an exemplary embodiment, the optical lens groups are switched between the first mode and the second mode by adjusting a separation distance of the first lens group and the second lens group on the optical axis when the object distance is changed. Illustratively, the first mode is, for example, a telephoto position, and the second mode is, for example, a close-up position, and when the object distance from the optical lens group moves from the telephoto position to the close-up position, focusing can be achieved by adjusting the distance between the first lens group and the second lens group on the optical axis.

In some examples, the half ImgH of the diagonal length of the effective pixel area on the imaging plane of the optical lens group, the half Semi-FOVi of the maximum angle of view of the optical lens group in the first mode, and the half Semi-FOVm of the maximum angle of view of the optical lens group in the second mode satisfy: 1< (ImgH × TAN (Semi-FOVi))/(ImgH × TAN (Semi-FOvm)) < 1.1. The Semi-FOV of the first mode and the second mode and the reasonable arrangement of the image plane ensure the consistency of the corresponding imaging plane and the Semi-FOV under the double lens system and ensure the performance balance of the double lens system.

In an exemplary embodiment, the optical lens group satisfies: 3< (TD-SD)/(SL-SD) <3.1, wherein TD is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, SD is the distance on the optical axis from the diaphragm to the image side surface of the sixth lens, and SL is the distance on the optical axis from the diaphragm to the imaging surface of the optical lens group. The spherical aberration, the coma aberration and the astigmatism in the first mode and the second mode are balanced by reasonably setting the position of the diaphragm and the distance between the diaphragm and the sixth lens as well as the imaging surface, and a better zooming effect is obtained.

In an exemplary embodiment, the optical lens group satisfies: 1.85< (BFLi × TAN (Semi-FOVi))/(BFLm × TAN (Semi-FOVm)) <1.95, where Semi-FOVi is half of the maximum angle of view of the optical lens group in the first mode, Semi-FOVm is half of the maximum angle of view of the optical lens group in the second mode, BFLi is a distance on the optical axis from the image side surface of the sixth lens of the optical lens group in the first mode to the imaging plane, and BFLm is a distance on the optical axis from the image side surface of the sixth lens of the optical lens group in the second mode to the imaging plane. Through the reasonable arrangement of half of the maximum field angle during the long-distance shooting and the close-distance shooting, the offset of the back focus during the microspur can be better compensated, and a better microspur design effect is obtained.

In an exemplary embodiment, the optical lens group satisfies: 1.3 <. DELTA.T/(TD-SD) <1.5, wherein TD is a distance on the optical axis from an object side surface of the first lens to an image side surface of the sixth lens, SD is a distance on the optical axis from the stop to the image side surface of the sixth lens, and DELTA.T is a variation amount of a spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode. The distance between the diaphragm and the sixth lens is reasonably set, so that spherical aberration, coma aberration and astigmatism in the first mode and the second mode can be balanced, and a good zooming effect can be obtained. Furthermore, the zooming moving distance of the first lens group and the second lens group is reasonably distributed, so that the stroke is ensured to be in a reasonable range, the stroke requirement of the motor is met, and the light and thin requirements of the mobile phone are met. The miniaturization of the optical lens group is ensured, the imaging quality of the optical lens group is ensured, and the power consumption is reduced.

In an exemplary embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the image plane and the entrance pupil diameter EPD of the optical lens group satisfy: 3.2< TTL/EPD < 3.7. The distance from the object side surface of the T first lens to the imaging surface on the optical axis and the entrance pupil diameter are reasonably set, and the performance and the feasibility during microspur shooting can be considered.

In an exemplary embodiment, the optical lens group satisfies: 4< [ delta ] T/(TTL-TD) <4.5, wherein, DeltaT is the variable quantity of the spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and TD is the distance between the object side surface of the first lens and the image side surface of the sixth lens on the optical axis. The zoom position is reasonably arranged, so that the balance of performance during macro shooting is facilitated, and a better macro effect is obtained.

In an exemplary embodiment, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, and the focal length f4 of the fourth lens satisfy: 0.1< | (f1+ f2)/(f3+ f4) | < 0.4. The consistency of working apertures at different object distances is facilitated while the system performance is guaranteed by the arrangement of the focal length of each lens.

In an exemplary embodiment, the focal length fG1 of the first lens group, the focal length fG2 of the second lens group, the focal length fi of the optical lens group in the first mode, and the focal length fm of the optical lens group in the second mode satisfy: 0.9< | (fG1+ fG2)/(fi-fm) | < 1.2. The focal lengths of the first mode and the second mode and the focal lengths of the lens groups are reasonably distributed, so that the performance balance of the system from infinite object distance to macro is favorably realized, and a better imaging effect is obtained.

In an exemplary embodiment, a maximum value ETmax of the edge thickness of each of the first to sixth lenses and a minimum value ETmin of the edge thickness of each of the first to sixth lenses satisfy: 1< (ETmax + ETmin)/ETmax < 1.4. The field curvature correction of the first mode and the second mode is facilitated by adjusting the difference of the edge thicknesses of the lenses, so that the field curvature characteristics of the first mode and the second mode are balanced.

In the exemplary embodiment, the edge thickness ET1 of the first lens, the edge thickness ET2 of the second lens, and the sum Σ ET of the edge thicknesses of the first through sixth lenses satisfy: 0.45< (ET2+ ET 4)/[ sigma ] ET < 0.6. The edge thickness of each lens is reasonably set, so that the off-axis aberration (such as astigmatism, field curvature and the like) of the optical lens group can be corrected, and better imaging performance can be obtained.

In an exemplary embodiment, the radius of curvature R3 of the object-side surface of the second lens, the radius of curvature R4 of the image-side surface of the second lens, the radius of curvature R9 of the object-side surface of the fifth lens, and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: 0.9< (R3+ R4)/(R9+ R10) < 1.1. The curvature radiuses of the second lens and the fifth lens in different lens groups are reasonably set, so that the reduction of the sensitivities of the first mode and the second mode and the reduction of the spherical aberration of the optical lens group are facilitated, the performances of the first mode and the second mode can be balanced, and the feasibility of zooming is guaranteed.

In an exemplary embodiment, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a distance T45 of the fourth lens to the fifth lens on the optical axis, and a distance T56 of the fifth lens to the sixth lens on the optical axis satisfy: 0.8< (CT4+ CT5)/(T45+ T56) < 1.1. Through setting up the interval between each lens that the second lens group includes and the thickness of lens, axial chromatic aberration and spherical aberration when can correcting the macro obtain better macro shooting effect.

In an exemplary embodiment, a distance Tr1r6 on the optical axis from the object-side surface of the first lens to the image-side surface of the third lens, and a distance Tr7r12 on the optical axis from the object-side surface of the fourth lens to the image-side surface of the sixth lens satisfy: 0.9< Tr1r6/Tr7r12< 1.1. The distance between the lenses of different lens groups is beneficial to realizing the zooming feasibility of the first mode and the second mode, and the spherical aberration and the chromatic spherical aberration of the optical lens group are corrected.

In an exemplary embodiment, the optical lens group satisfies: 1< ((. DELTA.T + CTmax)/. SIGMA CT < 1.1), wherein DeltaT is a change amount of a spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode, CTmax is a maximum value of a center thickness of each of the first lens to the sixth lens on the optical axis, and SIGMA CT is a sum total of center thicknesses of each of the first lens to the sixth lens on the optical axis, and contributes to correction of axial chromatic aberration and chromatic spherical aberration in the first mode and the second mode by properly adjusting a difference in thickness of each lens on the optical axis. Furthermore, the zooming moving distance of the first lens group and the second lens group is reasonably distributed, so that the stroke is in a reasonable range, the stroke requirement of the motor is met, and the light and thin requirements of the mobile phone are met. The miniaturization of the optical lens group is guaranteed, meanwhile, the imaging quality of the optical lens group is guaranteed, and meanwhile, the power consumption is reduced.

In an exemplary embodiment, the maximum effective half aperture DT11 of the object side surface of the first lens, the maximum effective half aperture DT31 of the object side surface of the third lens, the maximum effective half aperture DT42 of the image side surface of the fourth lens, and the maximum effective half aperture DT62 of the image side surface of the sixth lens satisfy: 1.4< (DT11-DT31)/(DT62-DT42) < 1.9. The maximum effective semi-aperture of the image side surface or the object side surface of each lens included in each lens group is reasonably arranged, so that the on-axis aberration and the off-axis aberration during different working object distances can be corrected, and a better zooming effect can be obtained.

In an exemplary embodiment, the maximum effective semi-aperture DT31 of the object-side surface of the third lens, the maximum effective semi-aperture DT32 of the image-side surface of the third lens, the maximum effective semi-aperture DT41 of the object-side surface of the fourth lens, and the maximum effective semi-aperture DT42 of the image-side surface of the fourth lens satisfy: 0.95< (DT31/DT41)/(DT32/DT42) <1. By reasonably setting the maximum effective half aperture of the image side surface or the object side surface of each lens included by the second lens group, the field curvature and astigmatism in different working object distances can be corrected, and the feasibility of zooming is ensured.

In an exemplary embodiment, the optical lens group may further include an optical filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image forming surface.

The application adjusts the spacing distance between the second lens group and the first lens group on the optical axis by moving the second lens group, so that the optical lens group is switched between the first mode and the second mode, and the moving focusing are realized. In addition, according to the image capture device, the maximum field angles of the first mode and the second mode and the image plane of the optical lens group are reasonably distributed, so that the performance balance of the dual-lens system is guaranteed, the focusing problem is improved, and the imaging quality is improved. On the other hand, by reasonably distributing the focal length, the surface type, the central thickness of each lens, the distance of each lens on the optical axis and the like of each lens included in the lens group, the optical lens group has at least one beneficial effect of balancing the aberration generated by the lens group at the front end and the lens group at the rear end, realizing miniaturization and the like while meeting the requirement of accurate focusing.

In an embodiment of the present application, at least one of the mirror surfaces of each lens group including the lens is an aspherical mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of the first lens, the second lens, and the third lens included in the first lens group and the fourth lens, the fifth lens, and the sixth lens included in the second lens group is an aspheric mirror surface. Optionally, the object-side surface and the image-side surface of the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspheric mirror surfaces.

However, it will be understood by those skilled in the art that the number of lenses constituting an optical lens group can be changed to obtain the respective results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although the description is made in the embodiment taking two lens groups and taking the example in which each lens group includes three lenses, the optical lens group is not limited to including two lens groups, and each lens group is not limited to including three lenses. The optical lens group may further include other numbers of lens groups, and each lens group may further include other numbers of lenses, if necessary.

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

Example 1

An optical lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 4B. Fig. 1 and 2 show schematic structural views of an optical lens group according to embodiment 1 of the present application in a first mode and a second mode, respectively.

As shown in fig. 1 and 2, the optical lens assemblies, in order from an object side to an image side along an optical axis, comprise: a first lens group G1 and a second lens group G2, the first lens group G1 having positive power, and the second lens group G2 having negative power. The first lens group G1 includes, in order, a first lens element E1, a second lens element E2, and a third lens element E3, the second lens group G2 includes, in order, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6, and the optical lens assembly further includes a filter E7 and an image plane S15.

The first lens element E1 has negative power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. Filter E7 has an object side S13 and an image side S14. Light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 1 shows a basic parameter table of the optical lens group of embodiment 1, in which the units of the radius of curvature, thickness/distance, and effective radius (i.e., maximum effective half aperture DT) are millimeters (mm).

TABLE 1

In the present embodiment, the distance TTL on the optical axis from the object side surface S1 to the imaging surface S15 of the first lens is 27.76mm, and the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 5.41 mm. Referring to table 1, in the first mode, the distance OBJ on the optical axis from the object side surface of the first lens to the object side surface of the first lens is infinity, that is, the object distance is infinity, the distance on the optical axis from the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 1.2476mm, the distance on the optical axis from the sixth lens of the second lens group G2 and the filter E7 is 12.1256mm, the focal length fi of the optical lens group in the first mode is 28.30mm, and the aperture value Fnoi of the optical lens group in the first mode is 3.30. In the second mode, the optical axis OBJ of the object to the object side surface of the first lens is 100mm, the optical axis distance between the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 7.3130mm, the optical axis distance between the sixth lens of the second lens group G2 and the filter E7 is 6.0600mm, the focal length fm of the optical lens group in the second mode is 20.42mm, and the aperture value Fnom of the optical lens group in the second mode is 2.38. Upon zooming, the distance on the optical axis of the lenses adjacent to each other in the first lens group G1 remains unchanged, and the distance on the optical axis of the lenses adjacent to each other in the second lens group G2 remains unchanged.

In the present embodiment, the aspheric surface type x included in the object-side surface and the image-side surface of the lenses of the first lens E1 to the sixth lens E6 may be defined using, but not limited to, the following aspheric surface formula:

wherein x is the distance rise from the vertex of the aspheric surface 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 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 and Table 3 below show the coefficients A of the high-order terms, respectively, which can be used for the aspherical mirror surfaces S1 through S12 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ 、A ₂₀ 、A ₂₂ 、A ₂₄ 、A ₂₆ 、A ₂₈ 、 A ₃₀ 。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.7883E-04

2.5693E-04

-1.6010E-04

7.7580E-05

-2.4526E-05

5.1016E-06

-7.2973E-07

S2

2.7765E-03

-2.6415E-03

1.5365E-03

-5.1471E-04

1.1104E-04

-1.6513E-05

1.7544E-06

S3

3.4632E-03

-1.0652E-02

7.1715E-03

-2.9212E-03

8.0216E-04

-1.5652E-04

2.2333E-05

S4

6.4812E-03

-1.4059E-02

1.0893E-02

-5.2564E-03

1.7296E-03

-4.0691E-04

7.0292E-05

S5

5.1102E-03

-7.4277E-03

5.2566E-03

-2.3754E-03

7.2362E-04

-1.5353E-04

2.3002E-05

S6

4.6319E-03

-7.3591E-03

6.0120E-03

-3.1418E-03

1.1207E-03

-2.8335E-04

5.1905E-05

S7

3.8844E-03

-8.3228E-04

5.7160E-04

-2.4584E-04

5.9992E-05

-6.3001E-06

-7.8816E-07

S8

2.1809E-03

6.8182E-04

-7.9147E-04

6.4035E-04

-3.3462E-04

1.1756E-04

-2.8830E-05

S9

-2.7030E-03

-4.9218E-04

5.3456E-04

-2.5202E-04

7.7451E-05

-1.6434E-05

2.4208E-06

S10

-2.9736E-03

-7.0349E-04

7.2860E-04

-3.6554E-04

1.2165E-04

-2.8327E-05

4.6948E-06

S11

2.8520E-05

-8.8965E-05

1.2109E-05

-4.2469E-07

0.0000E+00

0.0000E+00

0.0000E+00

S12

1.6574E-04

-1.0392E-04

1.3044E-05

-6.3645E-07

1.0200E-08

0.0000E+00

0.0000E+00

TABLE 2

TABLE 3

Fig. 3A and 4A show axial chromatic aberration curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 3B and 4B show distortion curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 3A to fig. 4B, the optical lens assembly of embodiment 1 can achieve accurate focusing, thereby achieving good imaging quality.

Example 2

An optical lens group according to embodiment 2 of the present application is described below with reference to fig. 5 to 8B. In this embodiment and the following embodiments, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 5 and 6 show schematic structural views of an optical lens group according to embodiment 2 of the present application in a first mode and a second mode, respectively.

As shown in fig. 5 and 6, the optical lens assembly includes, in order from an object side to an image side: a first lens group G1 and a second lens group G2, the first lens group G1 having positive power, the second lens group G2 having negative power. The first lens group G1 sequentially includes a first lens element E1, a second lens element E2 and a third lens element E3, the second lens group G2 sequentially includes a fourth lens element E4, a fifth lens element E5 and a sixth lens element E6, and the optical lens assembly further includes a filter E7 and an image plane S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The filter E7 has an object side S13 and an image side S14. The light from the subject passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.

Table 4 shows a basic parameter table of the optical lens group of embodiment 2, in which the units of the radius of curvature, thickness/distance, and effective radius (i.e., maximum effective half aperture DT) are millimeters (mm). Tables 5 and 6 show high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 4

In the present embodiment, the distance TTL on the optical axis from the object side surface S1 to the image formation surface S15 of the first lens is 27.83mm, and the ImgH, which is half the diagonal length of the effective pixel area on the image formation surface S15, is 5.41 mm. Referring to table 4, in the first mode, the distance OBJ on the optical axis from the object to the object side surface of the first lens is infinity, that is, the object distance is infinity, the distance on the optical axis from the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 1.2686mm, the distance on the optical axis from the sixth lens of the second lens group G2 and the filter E7 is 12.1890mm, the focal length fi of the optical lens group in the first mode is 28.43mm, and the aperture f of the optical lens group in the first mode is 3.54. In the second mode, the distance OBJ of the object to the object side surface of the first lens is 100mm on the optical axis, the distance on the optical axis between the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 7.3710mm, the distance on the optical axis between the sixth lens of the second lens group G2 and the filter E7 is 6.0870mm, the focal length fm of the optical lens group in the second mode is 20.51mm, and the aperture value Fnom of the optical lens group in the second mode is 2.55. Upon zooming, the distances on the optical axis of the lenses adjacent to each other in the first lens group G1 remain unchanged, and the distances on the optical axis of the lenses adjacent to each other in the second lens group G2 remain unchanged.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-2.0456E-03

2.4632E-03

-1.5515E-03

6.2620E-04

-1.7028E-04

3.2217E-05

-4.3395E-06

S2

1.8760E-03

-1.1808E-03

4.9041E-04

-5.9732E-05

-2.2508E-05

1.1135E-05

-2.3636E-06

S3

2.3360E-03

-8.5019E-03

5.3850E-03

-2.0397E-03

5.1236E-04

-8.9512E-05

1.1150E-05

S4

5.6372E-03

-1.2445E-02

9.3060E-03

-4.3015E-03

1.3439E-03

-2.9689E-04

4.7549E-05

S5

8.2570E-03

-1.3517E-02

1.1512E-02

-6.4443E-03

2.5107E-03

-7.0387E-04

1.4459E-04

S6

4.2480E-03

-6.8923E-03

5.7861E-03

-3.1721E-03

1.2090E-03

-3.3160E-04

6.6704E-05

S7

3.8707E-03

-6.5172E-04

3.9808E-04

-1.4164E-04

1.1779E-05

1.1441E-05

-5.8023E-06

S8

1.6911E-03

1.6542E-03

-1.8120E-03

1.3332E-03

-6.6011E-04

2.2708E-04

-5.5731E-05

S9

-2.8405E-03

-2.9891E-04

3.3652E-04

-1.1750E-04

1.8072E-05

1.1952E-06

-1.2117E-06

S10

-2.7211E-03

-1.2139E-03

1.1775E-03

-5.9897E-04

2.0118E-04

-4.6980E-05

7.7841E-06

S11

4.6828E-05

-1.0065E-04

1.3771E-05

-4.8776E-07

0.0000E+00

0.0000E+00

0.0000E+00

S12

1.8744E-04

-1.1461E-04

1.4576E-05

-7.2608E-07

1.1972E-08

0.0000E+00

0.0000E+00

TABLE 5

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

4.2123E-07

-2.9518E-08

1.4783E-09

-5.1553E-11

1.1883E-12

-1.6264E-14

1.0002E-16

S2

3.0918E-07

-2.7109E-08

1.6290E-09

-6.6412E-11

1.7589E-12

-2.7328E-14

1.8918E-16

S3

-1.0004E-06

6.4584E-08

-2.9679E-09

9.5007E-11

-2.0420E-12

2.7379E-14

-1.8267E-16

S4

-5.5824E-06

4.8016E-07

-2.9870E-08

1.3050E-09

-3.7829E-11

6.4907E-13

-4.9333E-15

S5

-2.1913E-05

2.4427E-06

-1.9754E-07

1.1258E-08

-4.2820E-10

9.7451E-12

-1.0027E-13

S6

-9.9131E-06

1.0852E-06

-8.6298E-08

4.8407E-09

-1.8130E-10

4.0627E-12

-4.1143E-14

S7

1.4546E-06

-2.3104E-07

2.4577E-08

-1.7525E-09

8.0584E-11

-2.1629E-12

2.5765E-14

S8

9.8949E-06

-1.2737E-06

1.1765E-07

-7.5948E-09

3.2512E-10

-8.2864E-12

9.5118E-14

S9

2.8741E-07

-3.9660E-08

3.5695E-09

-2.1296E-10

8.1501E-12

-1.8157E-13

1.7927E-15

S10

-9.1999E-07

7.6960E-08

-4.4479E-09

1.6881E-10

-3.7839E-12

3.7941E-14

0.0000E+00

S11

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S12

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

TABLE 6

Fig. 7A and 8A show axial chromatic aberration curves of the optical lens group of embodiment 2 in the first mode and the second mode, respectively, which indicate convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 7B and 8B show distortion curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 7A to 8B, the optical lens assembly of embodiment 2 can achieve accurate focusing, thereby achieving good imaging quality.

Example 3

An optical lens group according to embodiment 3 of the present application is described below with reference to fig. 9 to 12B. Fig. 9 and 10 show schematic structural views of an optical lens group according to embodiment 3 of the present application in a first mode and a second mode, respectively.

As shown in fig. 9 and 10, the optical lens assemblies, in order from an object side to an image side along an optical axis, comprise: a first lens group G1 and a second lens group G2, the first lens group G1 having positive power, and the second lens group G2 having negative power. The first lens group G1 sequentially includes a first lens element E1, a second lens element E2 and a third lens element E3, the second lens group G2 sequentially includes a fourth lens element E4, a fifth lens element E5 and a sixth lens element E6, and the optical lens assembly further includes a filter E7 and an image plane S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The filter E7 has an object side S13 and an image side S14. Light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 7 shows a basic parameter table of the optical lens group of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the effective radius (i.e., the maximum effective half-aperture DT) are all millimeters (mm). Tables 8 and 9 show high-order term coefficients that can be used for each aspherical mirror surface in embodiment 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.

TABLE 7

In the present embodiment, the distance TTL on the optical axis from the object side surface S1 to the image plane S15 of the first lens is 27.85mm, and the ImgH, which is half the diagonal length of the effective pixel area on the image plane S15, is 5.41 mm. Referring to table 7, in the first mode, the distance OBJ on the optical axis from the object side surface of the first lens to the object side surface of the first lens is infinity, that is, the object distance is infinity, the distance on the optical axis from the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 1.2464mm, the distance on the optical axis from the sixth lens of the second lens group G2 and the filter E7 is 12.2157mm, the focal length fi of the optical lens group in the first mode is 28.30mm, and the aperture value Fnoi of the optical lens group in the first mode is 3.54. In the second mode, the distance OBJ of the object to the object side surface of the first lens is 100mm on the optical axis, the distance on the optical axis between the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 7.4180mm, the distance on the optical axis between the sixth lens of the second lens group G2 and the filter E7 is 6.0440mm, the focal length fm of the optical lens group in the second mode is 20.39mm, and the aperture value Fnom of the optical lens group in the second mode is 2.55. Upon zooming, the distances on the optical axis of the lenses adjacent to each other in the first lens group G1 remain unchanged, and the distances on the optical axis of the lenses adjacent to each other in the second lens group G2 remain unchanged.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.9378E-03

2.4837E-03

-1.6399E-03

6.9713E-04

-2.0149E-04

4.0949E-05

-5.9864E-06

S2

6.2089E-04

6.3008E-04

-7.5012E-04

4.6196E-04

-1.7192E-04

4.1961E-05

-7.0788E-06

S3

1.4857E-03

-7.0053E-03

4.3725E-03

-1.7102E-03

4.6967E-04

-9.5214E-05

1.4583E-05

S4

5.2955E-03

-1.0993E-02

7.7232E-03

-3.4496E-03

1.0689E-03

-2.3860E-04

3.9005E-05

S5

7.4480E-03

-1.1387E-02

9.2297E-03

-5.0568E-03

1.9540E-03

-5.4472E-04

1.1097E-04

S6

4.9176E-03

-7.7628E-03

6.6032E-03

-3.7389E-03

1.4785E-03

-4.1886E-04

8.6301E-05

S7

3.4512E-03

1.4582E-04

-3.3250E-04

2.9883E-04

-1.7703E-04

7.0768E-05

-1.9636E-05

S8

1.5344E-03

1.8188E-03

-1.8219E-03

1.2675E-03

-6.1450E-04

2.1143E-04

-5.2505E-05

S9

-2.9570E-03

6.9263E-05

5.4870E-05

-1.6027E-05

-9.5826E-07

2.4137E-06

-9.7608E-07

S10

-2.8161E-03

-4.8904E-04

4.5787E-04

-2.3484E-04

8.5544E-05

-2.2260E-05

4.1365E-06

S11

4.3529E-04

-4.1476E-04

1.1082E-04

-1.6792E-05

1.5805E-06

-7.7710E-08

7.5016E-10

S12

4.7953E-04

-4.0327E-04

1.2316E-04

-2.3885E-05

3.0995E-06

-2.6107E-07

1.3596E-08

TABLE 8

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.3681E-07

-4.9331E-08

2.7525E-09

-1.0771E-10

2.8044E-12

-4.3620E-14

3.0664E-16

S2

8.4860E-07

-7.2976E-08

4.4741E-09

-1.9094E-10

5.3904E-12

-9.0490E-14

6.8396E-16

S3

-1.6982E-06

1.4959E-07

-9.8045E-09

4.6330E-10

-1.4906E-11

2.9193E-13

-2.6217E-15

S4

-4.6838E-06

4.1003E-07

-2.5676E-08

1.1105E-09

-3.1141E-11

5.0060E-13

-3.3959E-15

S5

-1.6604E-05

1.8196E-06

-1.4417E-07

8.0309E-09

-2.9812E-10

6.6169E-12

-6.6384E-14

S6

-1.3018E-05

1.4346E-06

-1.1407E-07

6.3645E-09

-2.3623E-10

5.2333E-12

-5.2313E-14

S7

3.8533E-06

-5.3836E-07

5.3204E-08

-3.6336E-09

1.6310E-10

-4.3292E-12

5.1482E-14

S8

9.4899E-06

-1.2472E-06

1.1777E-07

-7.7773E-09

3.4063E-10

-8.8835E-12

1.0437E-13

S9

2.2520E-07

-3.3857E-08

3.4273E-09

-2.3222E-10

1.0109E-11

-2.5581E-13

2.8610E-15

S10

-5.4782E-07

5.1193E-08

-3.2933E-09

1.3865E-10

-3.4358E-12

3.7957E-14

0.0000E+00

S11

8.0499E-11

-2.2493E-12

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S12

-3.9942E-10

5.0970E-12

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

TABLE 9

Fig. 11A and 12A show axial chromatic aberration curves of the optical lens group of embodiment 3 in the first mode and the second mode, respectively, which indicate convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 11B and 12B show distortion curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 11A to 12B, the optical lens assembly of embodiment 3 can be focused accurately, so as to achieve good imaging quality.

Example 4

An optical lens group according to embodiment 4 of the present application is described below with reference to fig. 13 to 16B. Fig. 13 and 14 are schematic structural views showing the optical lens group according to embodiment 4 of the present application in the first mode and the second mode, respectively.

As shown in fig. 13 and 14, the optical lens assembly includes, in order from an object side to an image side: a first lens group G1 and a second lens group G2, the first lens group G1 having positive power, and the second lens group G2 having negative power. The first lens group G1 includes, in order, a first lens element E1, a second lens element E2, and a third lens element E3, the second lens group G2 includes, in order, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6, and the optical lens assembly further includes a filter E7 and an image plane S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12. The filter E7 has an object side S13 and an image side S14. Light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 10 shows a basic parameter table of the optical lens group of embodiment 4, in which the units of the radius of curvature, thickness/distance, and effective radius (i.e., maximum effective half aperture DT) are millimeters (mm). Tables 11 and 12 show high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 10

In the present embodiment, the distance TTL on the optical axis from the object-side surface S1 of the first lens to the imaging surface S15 is 27.95mm, and the ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S15, is 5.41 mm. Referring to table 10, in the first mode, the distance OBJ on the optical axis from the object side surface of the first lens to the object side surface of the first lens is infinity, that is, the object distance is infinity, the distance on the optical axis from the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 1.2613mm, the distance on the optical axis from the sixth lens of the second lens group G2 and the filter E7 is 12.2340mm, the focal length fi of the optical lens group in the first mode is 28.26mm, and the aperture value Fnoi of the optical lens group in the first mode is 3.71. In the second mode, the distance OBJ of the object to the object side surface of the first lens is 100mm on the optical axis, the distance on the optical axis between the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 7.4210mm, the distance on the optical axis between the sixth lens of the second lens group G2 and the filter E7 is 6.0740mm, the focal length fm of the optical lens group in the second mode is 20.37mm, and the aperture value Fnom of the optical lens group in the second mode is 2.68. Upon zooming, the distance on the optical axis of the lenses adjacent to each other in the first lens group G1 remains unchanged, and the distance on the optical axis of the lenses adjacent to each other in the second lens group G2 remains unchanged.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-3.4178E-03

4.7105E-03

-3.2722E-03

1.4326E-03

-4.2294E-04

8.7546E-05

-1.3017E-05

S2

-1.4891E-03

4.4860E-03

-3.9890E-03

2.0921E-03

-7.1432E-04

1.6751E-04

-2.7880E-05

S3

-7.2752E-04

-2.2290E-03

-1.3224E-04

7.7375E-04

-4.2413E-04

1.2667E-04

-2.4570E-05

S4

3.5316E-03

-6.3621E-03

2.2730E-03

2.8639E-04

-6.0578E-04

2.8319E-04

-7.7844E-05

S5

9.4220E-03

-1.5332E-02

1.3789E-02

-8.5620E-03

3.7885E-03

-1.2131E-03

2.8385E-04

S6

5.4352E-03

-8.4209E-03

7.3027E-03

-4.3756E-03

1.8813E-03

-5.8939E-04

1.3564E-04

S7

4.2463E-03

-1.4407E-03

1.4594E-03

-9.7454E-04

4.2935E-04

-1.3066E-04

2.8157E-05

S8

1.7272E-03

1.5023E-03

-1.5527E-03

1.1599E-03

-6.1344E-04

2.3073E-04

-6.2455E-05

S9

-3.0709E-03

3.4525E-04

-1.8726E-04

1.1178E-04

-4.6993E-05

1.3896E-05

-2.9512E-06

S10

-2.5948E-03

-7.2713E-04

6.6174E-04

-3.5037E-04

1.2638E-04

-3.1874E-05

5.7336E-06

TABLE 11

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.4071E-06

-1.1068E-07

6.2658E-09

-2.4857E-10

6.5546E-12

-1.0314E-13

7.3257E-16

S2

3.3501E-06

-2.9175E-07

1.8242E-08

-7.9801E-10

2.3179E-11

-4.0142E-13

3.1359E-15

S3

3.2788E-06

-3.0633E-07

1.9892E-08

-8.7001E-10

2.3962E-11

-3.6096E-13

2.0593E-15

S4

1.4435E-05

-1.8826E-06

1.7382E-07

-1.1156E-08

4.7428E-10

-1.2022E-11

1.3767E-13

S5

-4.8724E-05

6.1163E-06

-5.5419E-07

3.5252E-08

-1.4924E-09

3.7737E-11

-4.3104E-13

S6

-2.2983E-05

2.8545E-06

-2.5627E-07

1.6165E-08

-6.7878E-10

1.7025E-11

-1.9284E-13

S7

-4.3410E-06

4.7755E-07

-3.6880E-08

1.9297E-09

-6.3909E-11

1.1668E-12

-8.2358E-15

S8

1.2253E-05

-1.7409E-06

1.7709E-07

-1.2557E-08

5.8890E-10

-1.6405E-11

2.0541E-13

S9

4.5704E-07

-5.1876E-08

4.2772E-09

-2.4938E-10

9.7377E-12

-2.2811E-13

2.4200E-15

S10

-7.4030E-07

6.8017E-08

-4.3336E-09

1.8174E-10

-4.5067E-12

5.0023E-14

0.0000E+00

TABLE 12

Fig. 15A and 16A show axial chromatic aberration curves of the optical lens group of embodiment 4 in the first mode and the second mode, respectively, which indicate convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 15B and 16B show distortion curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 15A to fig. 16B, the optical lens assembly according to embodiment 4 can achieve accurate focusing, thereby achieving good imaging quality.

Example 5

An optical lens group according to embodiment 5 of the present application is described below with reference to fig. 17 to 20B. Fig. 17 and 18 are schematic structural views showing the optical lens group according to embodiment 5 of the present application in the first mode and the second mode, respectively.

As shown in fig. 17 and 18, the optical lens assemblies, in order from an object side to an image side along an optical axis, comprise: a first lens group G1 and a second lens group G2, the first lens group G1 having positive power, the second lens group G2 having negative power. The first lens group G1 includes, in order, a first lens element E1, a second lens element E2, and a third lens element E3, the second lens group G2 includes, in order, a fourth lens element E4, a fifth lens element E5, and a sixth lens element E6, and the optical lens assembly further includes a filter E7 and an image plane S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a convex image-side surface S12. Filter E7 has an object side S13 and an image side S14. Light from the subject sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 13 shows a basic parameter table of the optical lens group of embodiment 5 in which the units of the radius of curvature, thickness/distance, and effective radius (i.e., maximum effective half aperture DT) are millimeters (mm). Tables 14 and 15 show high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 13

In the present embodiment, the distance TTL on the optical axis from the object side surface S1 to the image plane S15 of the first lens is 27.99mm, and the ImgH, which is half the diagonal length of the effective pixel area on the image plane S15, is 5.41 mm. Referring to table 13, in the first mode, the distance OBJ on the optical axis from the object to the object side surface of the first lens is infinity, that is, the object distance is infinity, the distance on the optical axis from the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 1.2459mm, the distance on the optical axis from the sixth lens of the second lens group G2 and the filter E7 is 12.2074mm, the focal length fi of the optical lens group in the first mode is 28.77mm, and the aperture f of the optical lens group in the first mode is 3.53. In the second mode, the optical axis OBJ of the object to the object side surface of the first lens is 100mm, the optical axis distance between the third lens of the first lens group G1 and the fourth lens of the second lens group G2 is 7.4220mm, the optical axis distance between the sixth lens of the second lens group G2 and the filter E7 is 6.0310mm, the focal length fm of the optical lens group in the second mode is 20.44mm, and the aperture value Fnom of the optical lens group in the second mode is 2.51. Upon zooming, the distance on the optical axis of the lenses adjacent to each other in the first lens group G1 remains unchanged, and the distance on the optical axis of the lenses adjacent to each other in the second lens group G2 remains unchanged.

TABLE 14

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

1.9233E-07

-1.4823E-08

8.1960E-10

-3.1646E-11

8.0952E-13

-1.2322E-14

8.4456E-17

S2

-2.4627E-07

1.6672E-08

-8.0565E-10

2.7043E-11

-5.9774E-13

7.8011E-15

-4.5390E-17

S3

-4.8163E-06

4.3201E-07

-2.8163E-08

1.2982E-09

-4.0111E-11

7.4543E-13

-6.2998E-15

S4

-2.1252E-05

2.3122E-06

-1.8349E-07

1.0332E-08

-3.9117E-10

8.9336E-12

-9.3011E-14

S5

-1.2072E-05

1.2137E-06

-8.7506E-08

4.3971E-09

-1.4579E-10

2.8571E-12

-2.4956E-14

S6

-1.4396E-05

1.5605E-06

-1.2197E-07

6.6898E-09

-2.4419E-10

5.3249E-12

-5.2463E-14

S7

-6.0273E-06

6.9632E-07

-5.7975E-08

3.3890E-09

-1.3204E-10

3.0805E-12

-3.2578E-14

S8

1.1312E-06

-1.3883E-07

1.2434E-08

-7.8506E-10

3.2924E-11

-8.1956E-13

9.1320E-15

S9

1.4074E-06

-1.5678E-07

1.2545E-08

-7.0220E-10

2.6079E-11

-5.7702E-13

5.7552E-15

S10

-3.5481E-07

3.0900E-08

-1.8398E-09

7.1245E-11

-1.6183E-12

1.6383E-14

0.0000E+00

S11

1.1750E-09

-2.4221E-11

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

S12

-2.1409E-11

-8.7970E-13

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

0.0000E+00

Watch 15

Fig. 19A and 20A show axial chromatic aberration curves of the optical lens group of embodiment 5 in the first mode and the second mode, respectively, which indicate convergent focus deviations of light rays of different wavelengths after passing through the lens. Fig. 19B and 20B show distortion curves of the optical lens group of embodiment 1 in the first mode and the second mode, respectively, which represent distortion magnitude values corresponding to different image heights. As can be seen from fig. 19A to 20B, the optical lens assembly of embodiment 5 can achieve accurate focusing, thereby achieving good imaging quality.

In summary, examples 1 to 5 satisfy the relationship shown in table 16, respectively.

TABLE 16

The present application also provides an imaging device whose electron photosensitive element may be a photosensitive coupled element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical lens group described above.

The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the scope of the present application. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (17)

1. The optical lens assembly, in order from an object side to an image side, comprises:

a first lens group having positive refractive power, including a first lens, a second lens and a third lens in this order, each having refractive power; and

a second lens group having negative refractive power, including a fourth lens, a fifth lens and a sixth lens in this order, each having refractive power;

wherein the optical lens group is switched between the first mode and the second mode by adjusting a separation distance of the first lens group and the second lens group on an optical axis when an object distance is changed, and a half ImgH of a diagonal line of an effective pixel area on an imaging plane of the optical lens group, a half Semi-FOVi of a maximum angle of view of the optical lens group in the first mode, and a half Semi-FOVm of a maximum angle of view of the optical lens group in the second mode satisfy:

1<(ImgH×TAN(Semi-FOVi))/(ImgH×TAN(Semi-FOVm))<1.1。

2. the optical lens group of claim 1, wherein the optical lens group includes an aperture stop located between the object side of the optical lens group and the third lens.

3. The optical lens group of claim 1, wherein the optical lens group further comprises a diaphragm, and the optical lens group satisfies:

3<(TD-SD)/(SL-SD)<3.1，

wherein TD is a distance between an object side surface of the first lens element and an image side surface of the sixth lens element on the optical axis, SD is a distance between the diaphragm and the image side surface of the sixth lens element on the optical axis, and SL is a distance between the diaphragm and an image plane of the optical lens assembly on the optical axis.

4. The optical lens group according to claim 1, wherein the optical lens group satisfies:

1.85<(BFLi×TAN(Semi-FOVi))/(BFLm×TAN(Semi-FOVm))<1.95，

wherein Semi-FOVi is a half of the maximum field angle of the optical lens group in the first mode, Semi-FOVm is a half of the maximum field angle of the optical lens group in the second mode, BFLi is a distance from the image side surface of the sixth lens to the image plane of the optical lens group in the first mode on the optical axis, and BFLm is a distance from the image side surface of the sixth lens to the image plane of the optical lens group in the second mode on the optical axis.

5. The optical lens group according to claim 1, wherein the optical lens group further comprises a diaphragm, and the optical lens group satisfies:

1.3<△T/(TD-SD)<1.5，

wherein TD is a distance between an object side surface of the first lens element and an image side surface of the sixth lens element on the optical axis, SD is a distance between the diaphragm and the image side surface of the sixth lens element on the optical axis, and Δ T is a variation of a separation distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode.

6. The optical lens group of claim 1, wherein a distance TTL between an object side surface of the first lens element and an image plane on the optical axis and an entrance pupil diameter EPD of the optical lens group satisfy: 3.2< TTL/EPD < 3.7.

7. The optical lens group of claim 1, wherein the optical lens group satisfies:

4<△T/(TTL-TD)<4.5，

wherein Δ T is a variation of a distance between the first lens group and the second lens group, TTL is a distance from an object-side surface of the first lens element to an image plane on the optical axis, and TD is a distance from the object-side surface of the first lens element to an image-side surface of the sixth lens element on the optical axis.

8. The optical lens group of claim 1, wherein the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: 0.1< | (f1+ f2)/(f3+ f4) | < 0.4.

9. The optical lens group of claim 1, wherein a focal length fG1 of the first lens group, a focal length fG2 of the second lens group, a focal length fi of the optical lens group in the first mode, and a focal length fm of the optical lens group in the second mode satisfy: 0.9< | (fG1+ fG2)/(fi-fm) | < 1.2.

10. The optical lens group of claim 1, wherein a maximum value ETmax of the edge thickness of each of the first to sixth lenses and a minimum value ETmin of the edge thickness of each of the first to sixth lenses satisfy: 1< (ETmax + ETmin)/ETmax < 1.4.

11. The optical lens group of claim 1, wherein an edge thickness ET1 of the first lens, an edge thickness ET2 of the second lens, and an edge thickness sum Σ ET of the first to sixth lenses satisfy:

0.45<(ET2+ET4)/∑ET<0.6。

12. the optical lens group of claim 1, wherein the second lens group comprises a fourth lens and a fifth lens each having a power, wherein a radius of curvature of an object side surface of the second lens R3, a radius of curvature of an image side surface of the second lens R4, a radius of curvature of an object side surface of the fifth lens R9, and a radius of curvature of an image side surface of the fifth lens R10 satisfy:

0.9<(R3+R4)/(R9+R10)<1.1。

13. the optical lens group of claim 1, wherein the second lens group comprises a fourth lens, a fifth lens and a sixth lens each having a power, wherein a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, a distance T45 of the fourth lens and the fifth lens on the optical axis, and a distance T56 of the fifth lens and the sixth lens on the optical axis satisfy: 0.8< (CT4+ CT5)/(T45+ T56) < 1.1.

14. The optical lens group of claim 1, wherein the second lens group comprises a fourth lens, a fifth lens and a sixth lens each having a power, wherein a distance Tr1r6 on the optical axis from the object side surface of the first lens to the image side surface of the third lens, and a distance Tr7r12 on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens satisfy:

0.9<Tr1r6/Tr7r12<1.1。

15. the optical lens group according to claim 1, wherein the optical lens group satisfies:

1<(△T+CTmax)/∑CT<1.1，

where Δ T is a variation amount of a spacing distance between the first lens group and the second lens group when the optical lens group is switched from the first mode to the second mode, CTmax is a maximum value of a center thickness of each of the first to sixth lenses on the optical axis, and Σ CT is a sum of center thicknesses of each of the first to sixth lenses on the optical axis.

16. The optical lens group of claim 1, wherein the second lens group comprises a fourth lens, a fifth lens and a sixth lens each having a power, wherein a maximum effective semi-aperture DT11 of an object side surface of the first lens, a maximum effective semi-aperture DT31 of an object side surface of the third lens, a maximum effective semi-aperture DT42 of an image side surface of the fourth lens and a maximum effective semi-aperture DT62 of an image side surface of the sixth lens satisfy:

1.4<(DT11-DT31)/(DT62-DT42)<1.9。

17. the optical lens group of claim 1, wherein the second lens comprises a fourth lens having optical power, wherein the maximum effective semi-aperture DT31 of the object-side surface of the third lens, the maximum effective semi-aperture DT32 of the image-side surface of the third lens, the maximum effective semi-aperture DT41 of the object-side surface of the fourth lens, and the maximum effective semi-aperture DT42 of the image-side surface of the fourth lens satisfy:

0.95<(DT31/DT41)/(DT32/DT42)<1。

Images