CN115166954A

CN115166954A - Optical imaging system

Info

Publication number: CN115166954A
Application number: CN202210943745.6A
Authority: CN
Inventors: 胡亚斌; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-10-11
Anticipated expiration: 2042-08-08
Also published as: CN115166954B

Abstract

The application discloses an optical imaging system, this optical imaging system includes from the object side to the image side along the optical axis in order: a first lens group having positive focal power, including a first lens having positive focal power, a second lens having negative focal power, and a third lens having positive focal power; and a second lens group having negative power, including a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having positive power or negative power; wherein an effective focal length FG1 of the first lens group and an effective focal length FG2 of the second lens group satisfy: 11< (FG 1-FG 2)/(FG 1+ FG 2) <26.

Description

Optical imaging system

Technical Field

The present application relates to the field of optical elements, and in particular, to an optical imaging system.

Background

In recent years, as 5G smart phones are rapidly developed and iterated, the attractiveness of mobile phone cameras to consumers is rapidly increased. Consumers expect that the application scenes shot by the mobile phone are more diversified, and the shooting effect can be good in long-distance view and micro-distance view. For a scene or a portrait shot in a long-range view, the longer the focal length of the lens is, the higher the magnification is, and for a shooting in a macro-range view, the longer the focal length is, the better the microscopic magnification visual effect is.

In order to enable consumers to have the high-image-quality photographing experience of multi-element scenes, an optical imaging lens which adopts a system structure in a focusing mode in two groups to realize telephoto and macro application scenes with good imaging quality and is applicable to portable electronic products is one of the hot spots of research in the lens field.

Disclosure of Invention

The present application provides an optical imaging system, in order from an object side to an image side along an optical axis, comprising: a first lens group having positive power, including a first lens having positive power, a second lens having negative power, and a third lens having positive power; and a second lens group having negative power, including a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having positive power or negative power; wherein, the effective focal length FG1 of the first lens group and the effective focal length FG2 of the second lens group satisfy: 11< (FG 1-FG 2)/(FG 1+ FG 2) <26.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f3 of the third lens, and the effective focal length FG1 of the first lens group satisfy: 1.7< (f 1+ f 3)/FG 1<2.7.

In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.6< (R1-R2)/R4 <2.8.

In one embodiment, an effective focal length f4 of the fourth lens, an effective focal length FG2 of the second lens group, and an effective focal length f5 of the fifth lens satisfy: 0< (f 4+ FG 2)/f 5<1.5.

In one embodiment, a radius of curvature R7 of the object-side surface of the fourth lens and a radius of curvature R8 of the image-side surface of the fourth lens satisfy: 3.1< (R8 + R7)/(R8-R7) <4.1.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens element and a radius of curvature R12 of the image-side surface of the sixth lens element satisfy: -1.8 sR12/R9 < -0.6.

In one embodiment, the system focal length FA of the optical imaging system in the first state and the system focal length FB of the optical imaging system in the second state satisfy: 11< (FA + FB)/(FA-FB) <14.

In one embodiment, the combined focal length f12 of the first lens and the second lens, and the air interval T23 on the optical axis of the second lens and the third lens satisfy: 9.5 were woven so as to have f12/T23<15.5.

In one embodiment, the combined focal length f45 of the fourth lens and the fifth lens, the air interval T45 of the fourth lens and the fifth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: -8 sj f45/(T45 + CT 5) < -3.

In one embodiment, an on-axis distance SAG11 between an intersection point of an object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG12 between an intersection point of an image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and a center thickness CT1 of the first lens on the optical axis satisfy: 1.6-straw CT1/(SAG 11+ SAG 12) <2.6.

In one embodiment, an on-axis distance SAG31 between an intersection of an object-side surface of the third lens and the optical axis to an effective radius vertex of the object-side surface of the third lens, an on-axis distance SAG32 between an intersection of an image-side surface of the third lens and the optical axis to an effective radius vertex of the image-side surface of the third lens, and an edge thickness ET3 of the third lens satisfy: -1.5< (SAG 31+ SAG 32)/ET 3< -0.9.

In one embodiment, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, and the air space T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.6< (ET 5+ ET 6)/T56 <2.5.

In one embodiment, the distance of movement of the second lens group along the optical axis when the optical imaging system is switched from the first state to the second state or from the second state to the first state is greater than 0.4 mm.

The application provides an optical imaging system includes first battery of lenses and second battery of lenses, wherein, the second battery of lenses is for moving the group of zooming, moves through the second battery of lenses and zooms and can both image perfectly with object space light under the macro on image surface, simultaneously, rationally sets up the focal power of first battery of lenses and second battery of lenses for the stroke that the second battery of lenses removed is less, guarantees that optical imaging system has good analytic power and high imaging quality.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1A and 1B show schematic structural views of an optical imaging system according to embodiment 1 of the present application in a first state and a second state, respectively;

fig. 2A to 2C respectively show an on-axis aberration curve, an astigmatism curve, and a distortion curve in a first state of an optical imaging system according to embodiment 1 of the present application;

fig. 2D to 2F show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, in a second state of an optical imaging system according to embodiment 1 of the present application;

fig. 3A and 3B are schematic structural views showing an optical imaging system according to embodiment 2 of the present application in a first state and a second state, respectively;

fig. 4A to 4C respectively show an on-axis aberration curve, an astigmatism curve, and a distortion curve in a first state of an optical imaging system according to embodiment 2 of the present application;

fig. 4D to 4F show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, in a second state of the optical imaging system according to embodiment 2 of the present application;

fig. 5A and 5B are schematic structural views showing an optical imaging system according to embodiment 3 of the present application in a first state and a second state, respectively;

fig. 6A to 6C show an on-axis aberration curve, an astigmatism curve, and a distortion curve in a first state of an optical imaging system according to embodiment 3 of the present application;

fig. 6D to 6F show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve in a second state of the optical imaging system according to embodiment 3 of the present application;

fig. 7A and 7B are schematic structural views showing an optical imaging system according to embodiment 4 of the present application in a first state and a second state, respectively;

fig. 8A to 8C respectively show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve in a first state of an optical imaging system according to embodiment 4 of the present application;

fig. 8D to 8F show an on-axis aberration curve, an astigmatism curve, and a distortion curve, respectively, in a second state of the optical imaging system according to embodiment 4 of the present application;

fig. 9A and 9B are schematic structural views showing an optical imaging system according to embodiment 5 of the present application in a first state and a second state, respectively;

fig. 10A to 10C respectively show an on-axis aberration curve, an astigmatism curve, and a distortion curve in a first state of an optical imaging system according to embodiment 5 of the present application; and

fig. 10D to 10F show an on-axis aberration curve, an astigmatism curve, and a distortion curve in the second state, respectively, of the optical imaging system according to embodiment 5 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 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, 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 following examples merely represent several embodiments of the present application, which are described in more detail and detail, but are not to be construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. 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.

The optical imaging system according to the exemplary embodiment of the present application may include, in order from an object side to an image side along an optical axis: the zoom lens comprises a first lens group and a second lens group, wherein the first lens group has positive focal power and sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power; the second lens group has negative focal power and sequentially comprises the following components from the object side to the image side along the optical axis: a fourth lens having a negative optical power, a fifth lens having a negative optical power, and a sixth lens having a positive or negative optical power. By reasonably controlling the positive and negative distribution of the focal power of each lens, the low-order aberration of the optical imaging system can be effectively and balancedly controlled, so that the system can obtain better imaging quality.

In an exemplary embodiment, the first lens group is a fixed focal length group and the second lens group is a moving zoom group. By moving the second lens group, the change of the system focal length can be realized, so that the optical imaging system has a better imaging effect in a first state and a second state, wherein the first state refers to a state with the maximum system focal length, and the second state refers to a state with the minimum system focal length. Illustratively, the first state may be a telephoto state, or a state in which the object distance is infinity, and the second state may be a short-focus state or a macro state, or a state in which the object distance is 100mm to 105 mm.

In an exemplary embodiment, the optical imaging system according to the present application further includes a stop disposed on an object side of the first lens.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 11< (FG 1-FG 2)/(FG 1+ FG 2) <26, where FG1 is the effective focal length of the first lens group and FG2 is the effective focal length of the second lens group. More specifically, FG1 and FG2 may further satisfy: 11.8< (FG 1-FG 2)/(FG 1+ FG 2) <25.6. The focusing lens meets the requirement of 11< (FG 1-FG 2)/(FG 1+ FG 2) <26, and by controlling the power distribution of the first lens group and the second lens group, the second lens group can perfectly image object light rays at infinity and a micro distance on an image surface in moving and zooming to ensure resolving power, and meanwhile, the power constraint distribution of the second lens group ensures that the moving stroke is small.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.7< (f 1+ f 3)/FG 1<2.7, wherein f1 is an effective focal length of the first lens, f3 is an effective focal length of the third lens, and FG1 is an effective focal length of the first lens group. More specifically, f1, f3 and FG1 may further satisfy: 2.1< (f 1+ f 3)/FG 1<2.5. The positive focal power of the first lens group after combination is in a reasonable range, and the third-order spherical aberration of the system is balanced, so that the positive focal power of the first lens group is in a reasonable range, and the 1.7< (f 1+ f 3)/FG 1<2.7 is satisfied.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.6< (R1-R2)/R4 <2.8, wherein R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, and R4 is the curvature radius of the image side surface of the second lens. More specifically, R1, R2 and R4 further may satisfy: 1.8< (R1-R2)/R4 <2.7. The ratio of the curvature radius of the object side surface and the curvature radius of the image side surface of the first lens to the curvature radius of the image side surface of the second lens is controlled to be more than 1.6< (R1-R2)/R4 <2.8, so that the meridional coma borne by the three surfaces can be offset.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0< (f 4+ FG 2)/f 5<1.5, wherein f4 is an effective focal length of the fourth lens, FG2 is an effective focal length of the second lens group, and f5 is an effective focal length of the fifth lens. More specifically, f4, FG2, and f5 may further satisfy: 0< (f 4+ FG 2)/f 5<1.4. The optical power of the fourth lens and the optical power of the fifth lens are restricted to be 0< (f 4+ FG 2)/f 5<1.5, so that the negative optical power of the combined second lens group is in a reasonable range, and the astigmatism in the meridian direction at the macro working object distance is balanced and offset.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 3.1< (R8 + R7)/(R8-R7) <4.1, wherein R7 is a radius of curvature of an object-side surface of the fourth lens, and R8 is a radius of curvature of an image-side surface of the fourth lens. More specifically, R8 and R7 may further satisfy: 3.1< (R8 + R7)/(R8-R7) <4.1. Satisfying 3.2< (R8 + R7)/(R8-R7) <4.0, controlling the ratio of the curvature radii of the object side surface and the image side surface of the fourth lens is beneficial to enabling the two surfaces to bear the astigmatism amount in the sagittal direction and balance the optical distortion of the off-axis visual field.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -1.8 sR12/R9 < -0.6, wherein R9 is the radius of curvature of the object side surface of the fifth lens and R12 is the radius of curvature of the image side surface of the sixth lens. More specifically, R12 and R9 may further satisfy: -1.8 sR12/R9 < -0.7. Satisfying-1.8 < -R12/R9 < -0.6 and restricting the ratio of the curvature radius of the object side surface of the fifth lens and the curvature radius of the image side surface of the sixth lens are favorable for leading the ghost image position and the area size generated by the two surface reflections to be in an acceptable range.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 11< (FA + FB)/(FA-FB) <14, wherein FA is the system focal length of the optical imaging system in the first state and FB is the system focal length of the optical imaging system in the second state. More specifically, FA and FB further satisfy: 11.9< (FA + FB)/(FA-FB) <13.6. The requirement of 11< (FA + FB)/(FA-FB) <14 is met, the system focal length difference of the optical imaging system in the first state and the second state is controlled, and the stroke of the inner focusing movement of the second lens group is ensured to be within the required range.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 9.5 instead of f12/T23<15.5, wherein f12 is the combined focal length of the first lens and the second lens, and T23 is the air space between the second lens and the third lens on the optical axis. More specifically, f12 and T23 further satisfy: 9.7 were woven so as to have f12/T23<15.45. Satisfy 9.5 and are woven once f12/T23<15.5, balance the astigmatism amount of the system arc vector direction and reserve space for the structure member to assemble and bear by restraining the light Jiao Dufen of the first lens and the second lens and matching the air space between the second lens and the third lens.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -8< -f45/(T45 + CT 5) < -3, wherein f45 is the combined focal length of the fourth lens and the fifth lens, T45 is the air space between the fourth lens and the fifth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis. More specifically, f45, T45, and CT5 may further satisfy: -7.9 and < -f45/(T45 + CT 5) < -3.1. Satisfy-8 < -f45/(T45 + CT 5) < -3, control the focal power distribution of fourth lens and fifth lens and the air interval size between them, be favorable to balancing the coma of the off-axis field of view of system and the astigmatism volume of meridional direction, control the central thickness of fifth lens is favorable to guaranteeing the processing technology nature of lens.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 1.6 instead of ct1/(SAG 11+ SAG 12) <2.6, where SAG11 is an on-axis distance between an intersection of an object-side surface and an optical axis of the first lens and an effective radius vertex of the object-side surface of the first lens, SAG12 is an on-axis distance between an intersection of an image-side surface and the optical axis of the first lens and an effective radius vertex of the image-side surface of the first lens, and CT1 is a central thickness of the first lens on the optical axis. More specifically, CT1, SAG11, and SAG12 further may satisfy: 1.9 plus CT1/(SAG 11+ SAG 12) <2.4. 1.6< -CT1/(SAG 11+ SAG 12) <2.6 is satisfied, the rise size and the intermediate thickness of the object side surface and the image side surface of the first lens are restrained within a reasonable range, on one hand, the shape processing technology of the first lens is ensured within a mature range, and simultaneously, the ghost image energy generated by four times of reflection of the two surfaces of the first lens is ensured to be weaker.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: -1.5< (SAG 31+ SAG 32)/ET 3< -0.9, wherein SAG31 is an on-axis distance between an intersection of an object-side surface and an optical axis of the third lens and an effective radius vertex of the object-side surface of the third lens, SAG32 is an on-axis distance between an intersection of an image-side surface and the optical axis of the third lens and an effective radius vertex of the image-side surface of the third lens, and ET3 is an edge thickness of the third lens. More specifically, SAG31, SAG32, and ET3 further may satisfy: -1.5< (SAG 31+ SAG 32)/ET 3< -1.0. The power lens meets the requirements of-1.5 < (SAG 31+ SAG 32)/ET 3< -0.9, the rise size and the edge thickness of the object side surface and the image side surface of the third lens are constrained within a reasonable range, and the power lens is favorable for correcting the Petzval field curvature and the astigmatism in the sagittal direction of the system.

In an exemplary embodiment, an optical imaging system according to the present application may satisfy: 0.6< (ET 5+ ET 6)/T56 <2.5, wherein ET5 is the edge thickness of the fifth lens, ET6 is the edge thickness of the sixth lens, and T56 is the air space between the fifth lens and the sixth lens on the optical axis. More specifically, ET5, ET6 and T56 may further satisfy: 0.7< (ET 5+ ET 6)/T56 <2.4. Satisfies 0.6< (ET 5+ ET 6)/T56 <2.5, further corrects the optical distortion of the off-axis field of view of the system by controlling the edge thickness of the fifth lens and the sixth lens and the air space between the fifth lens and the sixth lens, and simultaneously ensures that the structural member between the two lenses bears the space in a reasonable range.

In an exemplary embodiment, when the optical imaging system according to the present application is switched from the first state to the second state or from the second state to the first state, the moving distance of the second lens group along the optical axis is greater than 0.4 mm, the object distance of the optical imaging system in the first state and the second state is very different, and the design ensures the resolving power of the two states on one hand, and simultaneously restrains the moving distance of the second lens group within the motor stroke range.

In an exemplary embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the image plane may be, for example, in a range of 9.7mm to 10.0 mm.

In an exemplary embodiment, imgH, which is half the diagonal length of the effective pixel area on the imaging plane, may satisfy: 3.2mm is formed by the cloth of imgh and 3.6mm, which is beneficial to realizing a larger image plane, so that the optical system has higher pixels and resolution ratio and obtains higher imaging quality.

In an exemplary embodiment, the system focal length FA of the optical imaging system in the first state may be, for example, in the range of 9.9mm to 10.3mm, and the system focal length FB of the optical imaging system in the second state may be, for example, in the range of 8.4mm to 8.8 mm.

In an exemplary embodiment, the aperture value FnoA of the optical imaging system in the first state may be, for example, in the range of 2.00 to 2.20, and the aperture value FnoB of the optical imaging system in the second state may be, for example, in the range of 1.70 to 1.90.

In an exemplary embodiment, the effective focal length f1 of the first lens may be, for example, in the range of 4.2mm to 4.5mm, the effective focal length f2 of the second lens may be, for example, in the range of-6.8 mm to-5.6 mm, the effective focal length f3 of the third lens may be, for example, in the range of 7.3mm to 9.4mm, the effective focal length f4 of the fourth lens may be, for example, in the range of-11.4 mm to-9.9 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of-455.6 mm to-11.2 mm, and the effective focal length f6 of the sixth lens may be, for example, in the range of-24.0 mm to 10033.0 mm.

In an exemplary embodiment, the above-described optical imaging system may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface. The optical imaging system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above six lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging system is more favorable for production and processing.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, 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 an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens has an object-side surface and an image-side surface that are aspheric mirror surfaces.

Specific examples of the optical imaging system that can be applied to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical imaging system according to embodiment 1 of the present application is described below with reference to fig. 1A to 2F. Fig. 1A shows a schematic structural view of an optical imaging system according to embodiment 1 of the present application in a first state. Fig. 1B shows a schematic structural view of an optical imaging system according to embodiment 1 of the present application in a second state.

As shown in fig. 1A and fig. 1B, the optical imaging system includes, in order from an object side to an image side: the stop STO, the first lens group G1, the second lens group G2, the filter E7, and the image plane S15, wherein the first lens group G1 includes, in order from an object side to an image side along an optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2, in order from an object side to an image side along an optical axis, includes: a fourth lens E4, a fifth lens E5, and a sixth lens E6.

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

In this example, the system focal length FA of the optical imaging system at an object distance of infinity (e.g., an object distance of 100000000.0000 mm) (i.e., the first state) is 10.08mm, and the system focal length FB of the optical imaging system at a macro (e.g., an object distance of 100.5000 mm) (i.e., the second state) is 8.67mm. The aperture value FnoA of the optical imaging system in the first state is 2.05, and the aperture value FnoB of the optical imaging system in the second state is 1.78.

In this example, the optical axis distance TTL from the object side surface of the first lens of the optical imaging system to the imaging surface is 9.84mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is 3.52mm.

Table 1 shows a basic parameter table of the optical imaging system of example 1, in which the units of the radius of curvature, the thickness/distance, and the effective focal length are all millimeters (mm).

TABLE 1

In this example and the following embodiments, the first lens group G1 is a fixed focal power group, the second lens group G2 is a movable zoom group, and in the shooting process, by controlling the second lens group G2 to move as a whole, the adjustment of the focal length of the system can be realized, which is beneficial to ensuring that the imaging system has good imaging quality when the object moment is infinity or a macro state. Specifically, in the exemplary embodiment, when the object moment is switched to the macro state at infinity, the second lens group G2 moves on the optical axis, approaching toward the imaging surface away from the first lens group G1, i.e., the distance D8 of the second lens group G2 on the optical axis with respect to the first lens group G1 becomes larger, and the distance D14 with respect to the imaging surface decreases.

In embodiment 1, as shown in fig. 1A, when the object moment D1 of the optical imaging system is 100000000.0000mm (i.e., the first state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.3505mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the optical filter E7 is 0.9409mm. As shown in fig. 1B, when the object moment D1 of the optical imaging system is 100.5000mm (i.e., the second state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens to the object side surface S7 of the fourth lens E4 is 0.7640mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the optical filter E7 is 0.5274mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 to the sixth lens E6 are aspheric, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =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 2-1 and Table 2-2 show the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to 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 And A ₃₀ 。

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.0814E-02

2.0147E-03

-6.4273E-03

1.0420E-02

-1.0936E-02

7.8775E-03

-4.0080E-03

S2

-1.4032E-02

4.1611E-02

-5.7737E-02

5.7246E-02

-4.4504E-02

2.6858E-02

-1.2209E-02

S3

-4.7028E-02

1.2083E-01

-1.9237E-01

2.2293E-01

-2.0459E-01

1.4769E-01

-8.1399E-02

S4

-3.9278E-02

8.8683E-02

-1.3559E-01

1.3662E-01

-8.8902E-02

1.9114E-02

3.0024E-02

S5

-1.0736E-02

1.1236E-02

-4.9425E-02

1.2930E-01

-2.3757E-01

2.9963E-01

-2.6470E-01

S6

-8.4338E-04

-8.1007E-03

2.8038E-02

-6.3304E-02

9.1153E-02

-9.0905E-02

6.4812E-02

S7

-1.2888E-01

7.4457E-01

-2.2377E+00

5.1005E+00

-8.9484E+00

1.1925E+01

-1.1963E+01

S8

-4.5116E-02

6.5758E-01

-2.1645E+00

5.0517E+00

-8.8877E+00

1.1788E+01

-1.1760E+01

S9

3.9734E-02

-1.1489E-01

4.0783E-01

-1.3062E+00

2.9499E+00

-4.6866E+00

5.3327E+00

S10

1.0151E-02

-4.7131E-02

1.1330E-01

-2.7017E-01

4.7306E-01

-5.8407E-01

5.1477E-01

S11

-2.6704E-02

2.6870E-03

-1.1902E-02

2.3836E-02

-2.6633E-02

1.9918E-02

-1.0507E-02

S12

-2.5579E-02

1.3247E-03

-2.2668E-03

2.8874E-03

-1.0325E-03

-5.5829E-04

7.6933E-04

TABLE 2-1

Tables 2 to 2

Fig. 2A shows an on-axis chromatic aberration curve in the first state of the optical imaging system of embodiment 1, which represents a deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve in the first state of the optical imaging system of embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 2C shows a distortion curve of the optical imaging system of embodiment 1 in the first state, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows an on-axis chromatic aberration curve in the second state of the optical imaging system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2E shows an astigmatism curve in the second state of the optical imaging system of embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 2F shows a distortion curve of the optical imaging system of embodiment 1 in the second state, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 2A to 2F, the optical imaging system according to embodiment 1 can achieve good imaging quality.

Example 2

An optical imaging system according to embodiment 2 of the present application is described below with reference to fig. 3A to 4F. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3A shows a schematic structural view of an optical imaging system according to embodiment 2 of the present application in a first state. Fig. 3B shows a schematic structural view of an optical imaging system according to embodiment 2 of the present application in a second state.

As shown in fig. 3A and 3B, the optical imaging system, in order from an object side to an image side, comprises: a stop STO, a first lens group G1, a second lens group G2, a filter E7, and an image plane S15, wherein the first lens group G1 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2, in order from an object side to an image side along an optical axis, includes: a fourth lens E4, a fifth lens E5, and a sixth lens E6.

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

In this example, the system focal length FA of the optical imaging system at an object distance of infinity (e.g., an object distance of 100000000.0000 mm) (i.e., the first state) is 9.98mm, and the system focal length FB of the optical imaging system at a macro (e.g., an object distance of 100.5000 mm) (i.e., the second state) is 8.47mm. The aperture value FnoA of the optical imaging system in the first state is 2.19, and the aperture value FnoB of the optical imaging system in the second state is 1.86.

In this example, the optical axis distance TTL from the object side surface of the first lens of the optical imaging system to the imaging surface is 9.87mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is 3.27mm.

Table 3 shows a basic parameter table of the optical imaging system of example 2, in which the units of the radius of curvature, the thickness/distance, and the effective focal length are all millimeters (mm). Tables 4-1 and 4-2 show the 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 the formula (1) given in example 1 above.

TABLE 3

In embodiment 2, as shown in fig. 3A, when the object moment D1 of the optical imaging system is 100000000.0000mm (i.e., the first state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.3095mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the optical filter E7 is 0.8420mm. As shown in fig. 3B, when the object moment D1 of the optical imaging system is 100.5000mm (i.e., the second state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.7595mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the filter E7 is 0.3920mm.

TABLE 4-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

8.1009E-04

-2.1479E-04

4.0550E-05

-5.3025E-06

4.5488E-07

-2.2926E-08

5.1156E-10

S2

-1.1159E-02

3.6722E-03

-8.8177E-04

1.4990E-04

-1.7051E-05

1.1617E-06

-3.5773E-08

S3

-3.5505E-02

1.3113E-02

-3.5234E-03

6.6763E-04

-8.4333E-05

6.3613E-06

-2.1643E-07

S4

-6.4617E-02

3.0054E-02

-1.0103E-02

2.3802E-03

-3.7210E-04

3.4626E-05

-1.4508E-06

S5

6.6509E-02

-3.0788E-02

1.0275E-02

-2.4084E-03

3.7632E-04

-3.5196E-05

1.4905E-06

S6

-5.8278E-02

2.7192E-02

-9.0771E-03

2.1115E-03

-3.2483E-04

2.9681E-05

-1.2188E-06

S7

6.2023E+00

-3.4610E+00

1.4083E+00

-4.0504E-01

7.7890E-02

-8.9744E-03

4.6806E-04

S8

2.6170E+00

-1.3801E+00

5.3280E-01

-1.4591E-01

2.6796E-02

-2.9564E-03

1.4799E-04

S9

-6.9138E-01

4.9658E-01

-2.4039E-01

7.7524E-02

-1.5899E-02

1.8645E-03

-9.4356E-05

S10

-3.5318E-01

1.8705E-01

-7.0838E-02

1.8662E-02

-3.2412E-03

3.3276E-04

-1.5260E-05

S11

3.3737E-03

-9.2470E-04

1.8125E-04

-2.4725E-05

2.2268E-06

-1.1893E-07

2.8513E-09

S12

-3.4310E-05

4.6632E-06

-6.0754E-08

-8.6978E-08

1.4266E-08

-9.9762E-10

2.7347E-11

TABLE 4-2

Fig. 4A shows an on-axis chromatic aberration curve in the first state of the optical imaging system of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve in the first state of the optical imaging system of embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 4C shows a distortion curve of the optical imaging system of embodiment 2 in the first state, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows an on-axis chromatic aberration curve in the second state of the optical imaging system of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4E shows an astigmatism curve in the second state of the optical imaging system of embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 4F shows a distortion curve of the optical imaging system of embodiment 2 in the second state, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 4A to 4F, the optical imaging system according to embodiment 2 can achieve good imaging quality.

Example 3

An optical imaging system according to embodiment 3 of the present application is described below with reference to fig. 5A to 6F. Fig. 5A shows a schematic structural view of an optical imaging system according to embodiment 3 of the present application in a first state. Fig. 5B shows a schematic structural view of an optical imaging system according to embodiment 3 of the present application in a second state.

As shown in fig. 5A and 5B, the optical imaging system, in order from an object side to an image side, comprises: a stop STO, a first lens group G1, a second lens group G2, a filter E7, and an image plane S15, wherein the first lens group G1 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes, in order from an object side to an image side: a fourth lens E4, a fifth lens E5, and a sixth lens E6.

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

In this example, the system focal length FA of the optical imaging system at an object distance of infinity (e.g., an object distance of 100000000.0000 mm) (i.e., the first state) is 10.12mm, and the system focal length FB of the optical imaging system at a macro (e.g., an object distance of 100.5000 mm) (i.e., the second state) is 8.73mm. The aperture value FnoA of the optical imaging system in the first state is 2.09, and the aperture value FnoB of the optical imaging system in the second state is 1.78.

In this example, the optical axis distance TTL from the object side surface of the first lens of the optical imaging system to the imaging surface is 9.93mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is 3.40mm.

Table 5 shows a basic parameter table of the optical imaging system of example 3, in which the units of the radius of curvature, the thickness/distance, and the effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the 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 the formula (1) given in example 1 above.

TABLE 5

In embodiment 3, as shown in fig. 5A, when the object moment D1 of the optical imaging system is 100000000.0000mm (i.e., the first state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.3396mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the optical filter E7 is 0.9022mm. As shown in fig. 5B, when the object moment D1 of the optical imaging system is 100.5000mm (i.e., the second state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.7596mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the filter E7 is 0.4822mm.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.1460E-02

1.0955E-03

-3.6235E-03

5.6119E-03

-5.6258E-03

3.8779E-03

-1.8861E-03

S2

-1.2650E-02

3.9239E-02

-5.7316E-02

5.7872E-02

-4.3985E-02

2.5567E-02

-1.1304E-02

S3

-4.2223E-02

1.0231E-01

-1.6147E-01

1.8136E-01

-1.5540E-01

1.0310E-01

-5.2529E-02

S4

-3.4505E-02

7.4459E-02

-1.2138E-01

1.4407E-01

-1.3479E-01

1.0032E-01

-5.8627E-02

S5

-9.3449E-03

6.7545E-03

-3.0307E-02

7.0165E-02

-1.1975E-01

1.4306E-01

-1.2076E-01

S6

-2.0623E-03

-3.6323E-04

-2.2033E-03

1.1234E-02

-3.4424E-02

5.8145E-02

-6.1995E-02

S7

-9.4463E-02

6.1161E-01

-1.9261E+00

4.6718E+00

-8.7991E+00

1.2652E+01

-1.3751E+01

S8

6.8931E-02

1.0978E-01

-2.8925E-01

2.2930E-01

4.3868E-01

-1.7443E+00

2.9623E+00

S9

1.0716E-02

4.1919E-02

-4.0587E-01

1.5971E+00

-4.1019E+00

7.3338E+00

-9.3821E+00

S10

-6.9039E-03

-3.5652E-03

-2.7020E-02

7.7360E-02

-1.2548E-01

1.3951E-01

-1.1120E-01

S11

-2.4806E-02

1.3580E-02

-3.2323E-02

4.8149E-02

-4.6585E-02

3.1102E-02

-1.4734E-02

S12

-1.9783E-02

-5.0362E-04

1.1707E-03

-1.4003E-03

1.7031E-03

-1.3898E-03

7.3716E-04

TABLE 6-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

6.5560E-04

-1.6316E-04

2.8774E-05

-3.5031E-06

2.7940E-07

-1.3110E-08

2.7379E-10

S2

3.7633E-03

-9.3142E-04

1.6826E-04

-2.1520E-05

1.8454E-06

-9.5217E-08

2.2357E-09

S3

2.0286E-02

-5.8482E-03

1.2330E-03

-1.8414E-04

1.8423E-05

-1.1072E-06

3.0214E-08

S4

2.6566E-02

-9.2424E-03

2.4387E-03

-4.7617E-04

6.5242E-05

-5.5978E-06

2.2501E-07

S5

7.2899E-02

-3.1578E-02

9.7388E-03

-2.0899E-03

2.9726E-04

-2.5275E-05

9.7624E-07

S6

4.4657E-02

-2.2348E-02

7.8001E-03

-1.8657E-03

2.9191E-04

-2.6943E-05

1.1134E-06

S7

1.1213E+01

-6.7910E+00

3.0014E+00

-9.3859E-01

1.9648E-01

-2.4675E-02

1.4045E-03

S8

-3.1910E+00

2.3588E+00

-1.2170E+00

4.3218E-01

-1.0087E-01

1.3945E-02

-8.6584E-04

S9

8.6967E+00

-5.8490E+00

2.8243E+00

-9.5360E-01

2.1364E-01

-2.8522E-02

1.7170E-03

S10

6.4425E-02

-2.7145E-02

8.2254E-03

-1.7450E-03

2.4586E-04

-2.0650E-05

7.8187E-07

S11

5.0153E-03

-1.2285E-03

2.1433E-04

-2.5948E-05

2.0694E-06

-9.7695E-08

2.0670E-09

S12

-2.6278E-04

6.4364E-05

-1.0877E-05

1.2476E-06

-9.2824E-08

4.0440E-09

-7.8354E-11

TABLE 6-2

Fig. 6A shows an on-axis chromatic aberration curve in the first state of the optical imaging system of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve in the first state of the optical imaging system of embodiment 3, which represents meridional field curvature and sagittal field curvature. Fig. 6C shows a distortion curve of the optical imaging system of embodiment 3 in the first state, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 3 in the second state, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6E shows an astigmatism curve in the second state of the optical imaging system of embodiment 3, which represents meridional field curvature and sagittal field curvature. Fig. 6F shows a distortion curve of the optical imaging system of embodiment 3 in the second state, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 6A to 6F, the optical imaging system according to embodiment 3 can achieve good imaging quality.

Example 4

An optical imaging system according to embodiment 4 of the present application is described below with reference to fig. 7A to 8F. Fig. 7A shows a schematic structural view of an optical imaging system according to embodiment 4 of the present application in a first state. Fig. 7B shows a schematic structural view of an optical imaging system according to embodiment 4 of the present application in a second state.

As shown in fig. 7A and 7B, the optical imaging system, in order from an object side to an image side, comprises: a stop STO, a first lens group G1, a second lens group G2, a filter E7, and an image plane S15, wherein the first lens group G1 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 includes, in order from an object side to an image side: a fourth lens E4, a fifth lens E5, and a sixth lens E6.

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

In this example, the optical imaging system has a system focal length FA of 10.00mm at an object distance of infinity (e.g., an object distance of 100000000.0000 mm) (i.e., the first state) and an optical imaging system of 8.45mm at a macro (e.g., an object distance of 100.5000 mm) (i.e., the second state). The aperture value FnoA of the optical imaging system in the first state is 2.09, and the aperture value FnoB of the optical imaging system in the second state is 1.79.

In this example, the optical axis distance TTL from the object side surface of the first lens of the optical imaging system to the imaging surface is 9.93mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is 3.53mm.

Table 7 shows a basic parameter table of the optical imaging system of example 4 in which the units of the radius of curvature, the thickness/distance, and the effective focal length are all millimeters (mm). Tables 8-1 and 8-2 show the 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 the formula (1) given in example 1 above.

TABLE 7

In embodiment 4, as shown in fig. 7A, when the optical imaging system is in the state where the object moment D1 is 100000000.0000mm (i.e., the first state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.2452mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the optical filter E7 is 0.8966mm. As shown in fig. 7B, when the optical imaging system is in an object moment D1 of 100.5000mm (i.e., the second state), the second lens group G2 is moved as a whole to adjust the system focal length, a distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.7503mm, and a distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the filter E7 is 0.3915mm.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

1.1401E-02

2.6564E-03

-8.7210E-03

1.4588E-02

-1.5799E-02

1.1752E-02

-6.1829E-03

S2

1.0046E-02

-4.3438E-02

9.6125E-02

-1.3228E-01

1.2662E-01

-8.8089E-02

4.5280E-02

S3

-5.7362E-03

-4.8472E-02

1.2710E-01

-1.8646E-01

1.9021E-01

-1.4298E-01

8.0521E-02

S4

-1.4453E-02

-1.7975E-02

7.0741E-02

-1.3898E-01

1.9560E-01

-2.0553E-01

1.6066E-01

S5

-7.1830E-03

2.8681E-03

-2.8210E-02

7.3385E-02

-1.2176E-01

1.3764E-01

-1.0987E-01

S6

8.0141E-05

-1.2222E-02

4.8610E-02

-1.3406E-01

2.4476E-01

-3.0894E-01

2.7661E-01

S7

-9.2775E-02

5.0522E-01

-1.3798E+00

2.8235E+00

-4.4220E+00

5.2509E+00

-4.6979E+00

S8

3.5089E-03

2.9687E-01

-8.7512E-01

1.7640E+00

-2.6877E+00

3.0977E+00

-2.6897E+00

S9

2.5567E-02

-2.0170E-02

-8.0031E-02

3.5351E-01

-8.5687E-01

1.3859E+00

-1.5734E+00

S10

1.8477E-02

-2.8772E-02

1.0266E-02

1.4369E-02

-4.2621E-02

5.8209E-02

-5.1830E-02

S11

-1.2906E-02

-6.3857E-03

7.8784E-03

-8.2563E-03

7.4782E-03

-5.0030E-03

2.3936E-03

S12

-1.8783E-02

1.1249E-03

-1.8371E-03

3.0749E-03

-2.6701E-03

1.4991E-03

-5.8370E-04

TABLE 8-1

TABLE 8-2

Fig. 8A shows an on-axis chromatic aberration curve in the first state of the optical imaging system of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve in the first state of the optical imaging system of embodiment 4, which represents meridional field curvature and sagittal field curvature. Fig. 8C shows a distortion curve of the optical imaging system of embodiment 4 in the first state, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows an on-axis chromatic aberration curve in the second state of the optical imaging system of embodiment 4, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8E shows an astigmatism curve in the second state of the optical imaging system of embodiment 4, which represents meridional field curvature and sagittal field curvature. Fig. 8F shows a distortion curve of the optical imaging system of embodiment 4 in the second state, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 8A to 8F, the optical imaging system according to embodiment 4 can achieve good imaging quality.

Example 5

An optical imaging system according to embodiment 5 of the present application is described below with reference to fig. 9A to 10F. Fig. 9A shows a schematic structural view of an optical imaging system according to embodiment 5 of the present application in a first state. Fig. 9B shows a schematic structural view of an optical imaging system according to embodiment 5 of the present application in a second state.

As shown in fig. 9A and 9B, the optical imaging system includes, in order from an object side to an image side: a stop STO, a first lens group G1, a second lens group G2, a filter E7, and an image plane S15, wherein the first lens group G1 sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2, in order from an object side to an image side along an optical axis, includes: a fourth lens E4, a fifth lens E5, and a sixth lens E6.

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

In this example, the system focal length FA of the optical imaging system at an object distance of infinity (e.g., an object distance of 100000000.0000 mm) (i.e., the first state) is 10.21mm, and the system focal length FB of the optical imaging system at a macro (e.g., an object distance of 100.5000 mm) (i.e., the second state) is 8.65mm. The aperture value FnoA of the optical imaging system in the first state is 2.00, and the aperture value FnoB of the optical imaging system in the second state is 1.70.

In this example, the optical axis distance TTL from the object side surface of the first lens of the optical imaging system to the imaging surface is 9.75mm, and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is 3.34mm.

Table 9 shows a basic parameter table of the optical imaging system of example 5 in which the units of the radius of curvature, the thickness/distance, and the effective focal length are all millimeters (mm). Tables 10-1 and 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.

TABLE 9

In embodiment 5, as shown in fig. 9A, when the optical imaging system is in the state where the object distance D1 is 100000000.0000mm (i.e., the first state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.3001mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the filter E7 is 0.7960mm. As shown in fig. 9B, when the object moment D1 of the optical imaging system is 100.5000mm (i.e., the second state), the second lens group G2 is moved as a whole to adjust the system focal length, the distance D8 on the optical axis from the image side surface S6 of the third lens E3 to the object side surface S7 of the fourth lens E4 is 0.7501mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens E6 to the object side surface S13 of the filter E7 is 0.3460mm.

TABLE 10-1

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

4.4652E-04

-1.0388E-04

1.7150E-05

-1.9576E-06

1.4663E-07

-6.4742E-09

1.2753E-10

S2

1.2420E-03

-3.0271E-04

5.3200E-05

-6.5455E-06

5.3464E-07

-2.6046E-08

5.7307E-10

S3

5.7531E-03

-1.6197E-03

3.3129E-04

-4.7643E-05

4.5596E-06

-2.6060E-07

6.7301E-09

S4

2.0829E-02

-7.9915E-03

2.2386E-03

-4.4505E-04

5.9539E-05

-4.8074E-06

1.7692E-07

S5

5.2657E-02

-2.2827E-02

7.0637E-03

-1.5222E-03

2.1713E-04

-1.8448E-05

7.0761E-07

S6

-2.6827E-02

1.0404E-02

-2.9074E-03

5.7050E-04

-7.4627E-05

5.8452E-06

-2.0732E-07

S7

5.1719E+00

-2.6702E+00

1.0077E+00

-2.6946E-01

4.8289E-02

-5.1960E-03

2.5356E-04

S8

2.8202E+00

-1.3763E+00

4.9173E-01

-1.2470E-01

2.1229E-02

-2.1742E-03

1.0121E-04

S9

3.4362E+00

-2.3799E+00

1.1742E+00

-4.0259E-01

9.1099E-02

-1.2227E-02

7.3694E-04

S10

-6.1014E-02

2.8283E-02

-9.3242E-03

2.1254E-03

-3.1722E-04

2.7789E-05

-1.0795E-06

S11

2.9057E-03

-5.5895E-04

7.2042E-05

-5.7611E-06

2.3119E-07

-4.0840E-10

-2.0977E-10

S12

3.3930E-03

-7.7985E-04

1.2965E-04

-1.5159E-05

1.1808E-06

-5.4939E-08

1.1537E-09

TABLE 10-2

Fig. 10A shows an on-axis chromatic aberration curve in the first state of the optical imaging system of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve in the first state of the optical imaging system of embodiment 5, which represents meridional field curvature and sagittal field curvature. Fig. 10C shows a distortion curve in the first state of the optical imaging system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows an on-axis chromatic aberration curve in the second state of the optical imaging system of embodiment 5, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10E shows an astigmatism curve in the second state of the optical imaging system of embodiment 5, which represents meridional field curvature and sagittal field curvature. Fig. 10F shows a distortion curve of the optical imaging system of embodiment 5 in the second state, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 10A to 10F, the optical imaging system according to embodiment 5 can achieve good imaging quality.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

TABLE 11

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (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 imaging lens described above.

The above description is only a preferred embodiment 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 the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. An optical imaging system, in order from an object side to an image side along an optical axis, comprising:

a first lens group having positive focal power, including a first lens having positive focal power, a second lens having negative focal power, and a third lens having positive focal power; and

a second lens group having negative power, including a fourth lens having negative power, a fifth lens having negative power, and a sixth lens having positive power or negative power;

wherein an effective focal length FG1 of the first lens group and an effective focal length FG2 of the second lens group satisfy: 11< (FG 1-FG 2)/(FG 1+ FG 2) <26.

2. The optical imaging system of claim 1, wherein an effective focal length f1 of the first lens, an effective focal length f3 of the third lens, and an effective focal length FG1 of the first lens group satisfy:

1.7<(f1+f3)/FG1<2.7。

3. the optical imaging system of claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the radius of curvature R4 of the image-side surface of the second lens satisfy: 1.6< (R1-R2)/R4 <2.8.

4. The optical imaging system of claim 1, wherein an effective focal length f4 of the fourth lens, an effective focal length FG2 of the second lens group, and an effective focal length f5 of the fifth lens satisfy:

0<(f4+FG2)/f5<1.5。

5. the optical imaging system of claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy: 3.1< (R8 + R7)/(R8-R7) <4.1.

6. The optical imaging system of claim 1, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a radius of curvature R12 of an image-side surface of the sixth lens satisfy: -1.8 sR12/R9 < -0.6.

7. The optical imaging system of any of claims 1 to 6, wherein a system focal length FA of the optical imaging system in a first state and a system focal length FB of the optical imaging system in a second state satisfy:

11<(FA+FB)/(FA-FB)<14。

8. the optical imaging system of any of claims 1 to 6, wherein a combined focal length f12 of the first and second lenses, an air space T23 on the optical axis of the second and third lenses, satisfies: 9.5 were woven so as to have f12/T23<15.5.

9. The optical imaging system of any one of claims 1 to 6, wherein a combined focal length f45 of the fourth lens and the fifth lens, an air gap T45 of the fourth lens and the fifth lens on the optical axis, and a center thickness CT5 of the fifth lens on the optical axis satisfy: -8 sj f45/(T45 + CT 5) < -3.

10. The optical imaging system according to any one of claims 1 to 6, wherein an on-axis distance SAG11 between an intersection of the object-side surface of the first lens and the optical axis to an effective radius vertex of the object-side surface of the first lens, an on-axis distance SAG12 between an intersection of the image-side surface of the first lens and the optical axis to an effective radius vertex of the image-side surface of the first lens, and a center thickness CT1 of the first lens on the optical axis satisfy: 1.6-straw CT1/(SAG 11+ SAG 12) <2.6.