CN115166954B

CN115166954B - Optical imaging system

Info

Publication number: CN115166954B
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: 2024-04-26
Anticipated expiration: 2042-08-08
Also published as: CN115166954A

Abstract

The application discloses an optical imaging system, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens group having positive optical power, including a first lens having positive optical power, a second lens having negative optical power, and a third lens having positive optical power; and a second lens group having negative optical power, including a fourth lens having negative optical power, a fifth lens having negative optical power, and a sixth lens having positive or negative optical 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-FG2)/(FG1+FG2) <26.

Description

Optical imaging system

Technical Field

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

Background

In recent years, as 5G smartphones are rapidly developed and iterated, so too is the attractiveness of the phone camera to consumers. The application scene that consumers expect mobile phone shooting can be more diversified, and good shooting effect can be achieved when long-range scenery and micro-distance are achieved. For scenes or figures shot from long-range scenes, the longer the focal length of the lens is, the higher the magnification is, and for shooting of macro scenes, the longer the focal length is, the better the visual effect of microscopic magnification is.

In order to enable a consumer to have high-image-quality photographing experience of a multi-scene, designing a system structure adopting a focusing mode in two groups to realize a remote photographing and micro-distance dual-application scene with good imaging quality is one of hot spots for research in the field of lenses.

Disclosure of Invention

The present application provides an optical imaging system comprising, in order from an object side to an image side along an optical axis: a first lens group having positive optical power, including a first lens having positive optical power, a second lens having negative optical power, and a third lens having positive optical power; and a second lens group having negative optical power, including a fourth lens having negative optical power, a fifth lens having negative optical power, and a sixth lens having positive or negative optical 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-FG2)/(FG1+FG2) <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< (f1+f3)/FG1 <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, the effective focal length f4 of the fourth lens, the effective focal length FG2 of the second lens group, and the effective focal length f5 of the fifth lens satisfy: 0< (f4+FG2)/f 5<1.5.

In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the 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, the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1.8< R12/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 of the second lens and the third lens on the optical axis satisfy: 9.5< 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< f 45/(T45+CT5) < -3.

In one embodiment, an on-axis distance SAG11 between an intersection point of the object side surface of the first lens and the optical axis and an effective radius vertex of the object side surface of the first lens, an on-axis distance SAG12 between an intersection point of the image side surface of the first lens and the optical axis and 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< CT1/(SAG11+SAG12) <2.6.

In one embodiment, an on-axis distance SAG31 between an intersection of the object side surface of the third lens and the optical axis and an effective radius vertex of the object side surface of the third lens, an on-axis distance SAG32 between an intersection of the image side surface of the third lens and the optical axis and 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< (SAG31+SAG32)/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 is greater than 0.4 millimeters when the optical imaging system is switched from the first state to the second state or vice versa.

The optical imaging system provided by the application comprises the first lens group and the second lens group, wherein the second lens group is a movable zoom group, and object light rays at infinity and a micro-distance can be completely imaged on an image plane through the movable zoom of the second lens group, and meanwhile, the focal power of the first lens group and the second lens group is reasonably set, so that the moving stroke of the second lens group is smaller, and the optical imaging system is ensured to have good resolving power and high imaging quality.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, 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 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the optical imaging system according to embodiment 1 of the present application in a first state;

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

fig. 3A and 3B show schematic structural views of 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 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the optical imaging system according to embodiment 2 of the present application in the first state;

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

Fig. 5A and 5B show schematic structural views of 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 on-axis chromatic aberration curves, astigmatism curves, and distortion curves of the optical imaging system according to embodiment 3 of the present application in the first state;

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

fig. 7A and 7B show schematic structural views of 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 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the optical imaging system according to embodiment 4 of the present application in the first state;

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

fig. 9A and 9B show schematic structural views of 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 show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the optical imaging system according to embodiment 5 of the present application in the first state; and

Fig. 10D to 10F show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the optical imaging system according to embodiment 5 of the present application in the second state.

Detailed Description

For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are 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, then 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 referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

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

In an exemplary embodiment, the first lens group is a focal length fixed group and the second lens group is a moving zoom group. Through the movement of the second lens group, the change of the system focal length can be realized, so that the optical imaging system has better imaging effect in a first state and a second state, wherein the first state is the state with the largest system focal length, and the second state is the state with the smallest system focal length. The first state may be a tele state or an infinite object distance state, and the second state may be a short focus state or a macro state or an object distance state of 100mm to 105 mm.

In an exemplary embodiment, the optical imaging system according to the present application further comprises a stop placed at the object side of the first lens.

In an exemplary embodiment, the 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)/(FG1+FG2) <25.6. Satisfying 11< (FG 1-FG 2)/(FG1+FG2) <26, by controlling the distribution of optical power of the first lens group and the second lens group, object rays at infinity and a micro-distance can be well imaged on an image plane in the moving zooming of the second lens group, so that resolving power is ensured, and meanwhile, the constraint distribution of optical power of the second lens group is smaller in moving stroke.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.7< (f1+f3)/FG 1<2.7, where f1 is the effective focal length of the first lens, f3 is the effective focal length of the third lens, FG1 is the effective focal length of the first lens group. More specifically, f1, f3, and FG1 may further satisfy: 2.1< (f1+f3)/FG1 <2.5. Satisfying 1.7< (f1+f3)/FG1 <2.7, is favorable to restricting the optical power of the first lens and the third lens, makes the positive optical power of the first lens group after the combination be in reasonable range, balances the third order spherical aberration of the system.

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

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0< (f4+F2)/f 5<1.5, wherein f4 is the effective focal length of the fourth lens, FG2 is the effective focal length of the second lens group, and f5 is the effective focal length of the fifth lens. More specifically, f4, FG2, and f5 may further satisfy: 0< (f4+FG2)/f5 <1.4. Satisfying 0< (f4+F2)/f 5<1.5, constraining the optical power of the fourth lens and the fifth lens, being beneficial to enabling the negative optical power of the combined second lens group to be in a reasonable range, and balancing and counteracting the astigmatic quantity of the macro working object in the meridian direction.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.1< (r8+r7)/(R8-R7) <4.1, wherein R7 is the radius of curvature of the object-side surface of the fourth lens element and R8 is the radius of curvature of the image-side surface of the fourth lens element. More specifically, R8 and R7 may further satisfy: 3.1< (R8+R7)/(R8-R7) <4.1. The ratio of the curvature radius of the object side surface and the image side surface of the fourth lens is controlled to be 3.2< (R8+R7)/(R8-R7) <4.0, which is favorable for enabling the two surfaces to bear the astigmatic quantity of the sagittal direction and balance the optical distortion of the off-axis visual field.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -1.8< R12/R9< -0.6, wherein R9 is the radius of curvature of the object-side surface of the fifth lens element and R12 is the radius of curvature of the image-side surface of the sixth lens element. More specifically, R12 and R9 may further satisfy: -1.8< R12/R9< -0.7. Satisfying-1.8 < R12/R9< -0.6, restricting the ratio of the radius of curvature of the object side surface of the fifth lens to the radius of curvature of the image side surface of the sixth lens, and facilitating the position and the area of the ghost images generated by the reflection of the two surfaces to be within the acceptable range.

In an exemplary embodiment, the 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 may further satisfy: 11.9< (FA+FB)/(FA-FB) <13.6. And the system focal length difference of the optical imaging system in the first state and the second state is controlled to ensure that the stroke of the inner focusing movement of the second lens group is ensured to be within the required range requirement when 11< (FA+FB)/(FA-FB) <14 is satisfied.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 9.5< 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 may further satisfy: 9.7< f12/T23<15.45. Satisfying 9.5< f12/T23<15.5, balancing the astigmatic quantity in the system sagittal direction and reserving the space for the structural member assembly to bear by restricting the optical power distribution of the first lens and the second lens and the air interval between the second lens and the third lens.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -8< f 45/(t45+ct5) < -3, wherein f45 is the combined focal length of the fourth lens and the fifth lens, T45 is the air space on the optical axis between the fourth lens and the fifth lens, and CT5 is the center thickness of the fifth lens on the optical axis. More specifically, f45, T45, and CT5 may further satisfy: -7.9< f 45/(t45+ct5) < -3.1. Satisfying-8 < f 45/(T45+CT5) < -3, controlling the optical power distribution of the fourth lens and the fifth lens and the size of the air interval between the fourth lens and the fifth lens, being beneficial to balancing the coma aberration of the system off-axis view field and the astigmatic quantity of the meridian direction, and controlling the center thickness of the fifth lens is beneficial to ensuring the processing manufacturability of the lens.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.6< ct1/(sag11+sag12) <2.6, wherein SAG11 is an on-axis distance between an intersection point 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, SAG12 is an on-axis distance between an intersection point 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 CT1 is a center thickness of the first lens on the optical axis. More specifically, CT1, SAG11, and SAG12 may further satisfy: 1.9< CT1/(SAG11+SAG12) <2.4. Satisfying 1.6< CT 1/(SAG11+SAG12) <2.6, restricting the sagittal height and the middle thickness of the object side surface and the image side surface of the first lens to be in a reasonable range, ensuring that the shape processing technology of the first lens is in a mature range on one hand, and simultaneously ensuring that the energy of ghost images generated by four-time reflection on the two surfaces of the first lens is weaker.

In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -1.5< - (sag31+sag32)/ET 3< -0.9, wherein SAG31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, SAG32 is the on-axis distance between the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens, ET3 is the edge thickness of the third lens. More specifically, SAG31, SAG32, and ET3 may further satisfy: -1.5< (SAG31+SAG32)/ET 3< -1.0. Meets the requirement of-1.5 < (SAG31+SAG32)/ET 3< -0.9, restricts the sagittal height and the edge thickness of the object side surface and the image side surface of the third lens to be in a reasonable range, and is favorable for correcting the astigmatism in the Petzvaractors and the sagittal direction of the system.

In an exemplary embodiment, the 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 gap 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, and the optical distortion of the off-axis view field of the system is further corrected by controlling the edge thickness of the fifth lens and the sixth lens and the air interval between the fifth lens and the sixth lens, and meanwhile, the bearing space of structural members between the two lenses is ensured to be 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 0.4mm, and the object distance of the optical imaging system according to the present application in the first state and the second state is very different, so that the resolution of the two states is ensured on the one hand in the design, and the moving distance of the second lens group is restrained within the range of the motor stroke.

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

In an exemplary embodiment, half the diagonal length ImgH of the effective pixel region on the imaging plane may satisfy: 3.2mm < ImgH <3.6mm, which is helpful to realize larger image surface, so that the optical system has higher pixel and resolution 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 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 embodiment of the present application may employ a plurality of lenses, for example, the above six lenses. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, incident light rays can be effectively converged, the optical total length of the imaging lens is reduced, and the processability of the imaging lens is improved, so that the optical imaging system is more beneficial to production and processing.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, 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. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of the object side surface and the 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 aspherical mirror surface. Optionally, the object side surface and the 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 are aspheric mirror surfaces.

Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying 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 configuration diagram of an optical imaging system according to embodiment 1 of the present application in a first state. Fig. 1B shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present application in a second state.

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

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 is 10.08mm at infinity (i.e., first state) for an object distance (e.g., object distance 100000000.0000 mm) and the system focal length FB of the optical imaging system is 8.67mm at a macro (i.e., second state) for an object distance (e.g., 100.5000 mm). 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 distance TTL from the object side surface of the first lens element of the optical imaging system to the imaging surface on the optical axis is 9.84mm, and the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system is 3.52mm.

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

TABLE 1

In this example and the following embodiments, the first lens group G1 is a power fixed group, the second lens group G2 is a mobile zoom group, and in the shooting process, the adjustment of the focal length of the system can be achieved by controlling the overall movement of the second lens group G2, which is beneficial to ensuring that the imaging system has good imaging quality in the state that the object moment is infinity or a macro distance. 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 away from the first lens group G1 toward the imaging surface, i.e., the distance D8 of the second lens group G2 with respect to the first lens group G1 at the optical axis becomes large and the distance D14 with respect to the imaging surface decreases.

In embodiment 1, as shown in fig. 1A, when the object moment D1 is 100000000.0000mm (i.e., the first state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.3505mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter element E7 on the optical axis is 0.9409mm. As shown in fig. 1B, when the object moment D1 is 100.5000mm (i.e., the second state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.7640mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter E7 on the optical axis 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 aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height 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 aspherical i-th order. The higher order coefficients A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈、A₂₀、A₂₂、A₂₄、A₂₆、A₂₈ and A ₃₀ that can be used for each of the aspherical mirror faces S1-S12 in example 1 are given in tables 2-1 and 2-2.

Face number

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

TABLE 2-2

Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 1 in the first state, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve in a first state of the optical imaging system of embodiment 1, which represents meridional image plane curvature and sagittal image plane 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 of the optical imaging system of embodiment 1 in the second state, which represents the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2E shows an astigmatism curve in a second state of the optical imaging system of embodiment 1, which represents meridional image plane curvature and sagittal image plane 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 of 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 portions similar to embodiment 1 will be omitted for 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 the 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 sequentially includes, from an object side to an image side: the stop STO, the first lens group G1, the second lens group G2, the optical filter E7, and the imaging plane S15, wherein the first lens group G1 sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 sequentially includes, along the optical axis from an object side to an image side: fourth lens E4, fifth lens E5, and sixth lens E6.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 is 9.98mm at infinity (i.e., first state) for an object distance (e.g., object distance 100000000.0000 mm) and the system focal length FB of the optical imaging system is 8.47mm at a macro (i.e., object distance 100.5000 mm). 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 distance TTL from the object side surface to the imaging surface of the first lens of the optical imaging system on the optical axis is 9.87mm, and the half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging system is 3.27mm.

Table 3 shows the basic parameter table of the optical imaging system of example 2, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Tables 4-1 and 4-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.

TABLE 3 Table 3

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

TABLE 4-1

Face number

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 of the optical imaging system of embodiment 2 in the first state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve in a first state of the optical imaging system of embodiment 2, which represents meridional image plane curvature and sagittal image plane 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 of the optical imaging system of embodiment 2 in the second state, which indicates the convergent focus deviation 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 image plane curvature and sagittal image plane 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 the 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 sequentially includes, from an object side to an image side: the stop STO, the first lens group G1, the second lens group G2, the optical filter E7, and the imaging plane S15, wherein the first lens group G1 sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 sequentially includes, along the optical axis from an object side to an image side: fourth lens E4, fifth lens E5, and sixth lens E6.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 is 10.12mm at infinity (i.e., first state) for an object distance (e.g., object distance 100000000.0000 mm) and the system focal length FB of the optical imaging system is 8.73mm at a macro (i.e., object distance 100.5000 mm) for a 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 1.78.

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

Table 5 shows the basic parameter table of the optical imaging system of example 3, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles 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 is 100000000.0000mm (i.e., the first state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.3396mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter element E7 on the optical axis is 0.9022mm. As shown in fig. 5B, when the object moment D1 is 100.5000mm (i.e., the second state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.7596mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter element E7 on the optical axis is 0.4822mm.

Face number

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

Face number

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 of the optical imaging system of embodiment 3 in the first state, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve in a first state of the optical imaging system of embodiment 3, which represents meridional image plane curvature and sagittal image plane 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 indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6E shows an astigmatism curve in a second state of the optical imaging system of embodiment 3, which represents meridional image plane curvature and sagittal image plane 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 diagram of an optical imaging system according to embodiment 4 of the present application in a first state. Fig. 7B shows a schematic structural diagram of the 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 sequentially includes, from an object side to an image side: the stop STO, the first lens group G1, the second lens group G2, the optical filter E7, and the imaging plane S15, wherein the first lens group G1 sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 sequentially includes, along the optical axis from an object side to an image side: fourth lens E4, fifth lens E5, and sixth lens E6.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 is 10.00mm at infinity (i.e., first state) for an object distance (e.g., object distance 100000000.0000 mm) and 8.45mm at a macro (i.e., second state) for an object distance (e.g., 100.5000 mm). 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 distance TTL from the object side surface of the first lens element of the optical imaging system to the imaging surface on the optical axis is 9.93mm, and the half of the diagonal length ImgH of the effective pixel region 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 radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Tables 8-1 and 8-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface profiles 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 at an object moment D1 of 100000000.0000mm (i.e., the first state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 on the optical axis from the image side surface S6 of the third lens element E3 to the object side surface S7 of the fourth lens element E4 is 0.2452mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens element 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 at an object moment D1 of 100.5000mm (i.e., the second state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.7503mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter element E7 on the optical axis is 0.3915mm.

Face number

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 of the optical imaging system of embodiment 4 in the first state, which indicates a convergent focus deviation 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 image plane curvature and sagittal image plane 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 of the optical imaging system of embodiment 4 in the second state, which indicates 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 image plane curvature and sagittal image plane 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 the 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 sequentially includes, from an object side to an image side: the stop STO, the first lens group G1, the second lens group G2, the optical filter E7, and the imaging plane S15, wherein the first lens group G1 sequentially includes, from the object side to the image side along the optical axis: a first lens E1, a second lens E2, and a third lens E3; the second lens group G2 sequentially includes, along the optical axis from an object side to an image side: fourth lens E4, fifth lens E5, and sixth lens E6.

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. 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 is 10.21mm at infinity (i.e., first state) for an object distance (e.g., object distance 100000000.0000 mm) and the system focal length FB of the optical imaging system is 8.65mm at a macro (i.e., object distance 100.5000 mm). 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 distance TTL from the object side surface of the first lens element of the optical imaging system to the imaging surface on the optical axis is 9.75mm, and the half of the diagonal length ImgH of the effective pixel region 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 radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Tables 10-1 and 10-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface profiles 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 at an object moment D1 of 100000000.0000mm (i.e., the first state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 on the optical axis from the image side surface S6 of the third lens element E3 to the object side surface S7 of the fourth lens element E4 is 0.3001mm, and the distance D14 on the optical axis from the image side surface S12 of the sixth lens element E6 to the object side surface S13 of the optical filter element E7 is 0.7960mm. As shown in fig. 9B, when the optical imaging system is at an object moment D1 of 100.5000mm (i.e., the second state), the second lens group G2 moves as a whole to adjust the focal length of the system, the distance D8 between the image side surface S6 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 on the optical axis is 0.7501mm, and the distance D14 between the image side surface S12 of the sixth lens element E6 and the object side surface S13 of the filter element E7 on the optical axis is 0.3460mm.

TABLE 10-1

Face number

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 of the optical imaging system of embodiment 5 in the first state, which indicates a convergent focus deviation 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 image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging system of embodiment 5 in the first state, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows an on-axis chromatic aberration curve of the optical imaging system of embodiment 5 in the second state, which indicates 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 image plane curvature and sagittal image plane 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 provided in embodiment 5 can achieve good imaging quality.

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

TABLE 11

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling 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 an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical imaging lens described above.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

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

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

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

the number of lens groups having optical power in the optical imaging system is two;

the number of lenses having optical power in the first lens group is three;

the number of lenses having optical power in the second lens group is three;

The first lens group is a focal length fixed group, the second lens group is a movable zoom group, and the optical imaging system is switched between a first state and a second state through the movement of the second lens group, wherein the system focal length of the optical imaging system in the first state is maximum, and the system focal length of the optical imaging system in the second state is minimum;

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-FG2)/(FG1+FG2) <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 a radius of curvature R1 of the object side of the first lens, a radius of curvature R2 of the image side of the first lens, and a radius of curvature R4 of the image side 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 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.

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

7. The optical imaging system according to any one 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 lens and the second lens, an air separation T23 of the second lens and the third lens on the optical axis satisfies: 9.5< f12/T23<15.5.

9. The optical imaging system according to any one of claims 1 to 6, wherein a combined focal length f45 of the fourth lens and the fifth lens, an air interval 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< f 45/(T45+CT5) < -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< CT1/(SAG11+SAG12) <2.6.

11. The optical imaging system of any of claims 1 to 6, wherein an on-axis distance SAG31 between an intersection of the 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 the 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< (SAG31+SAG32)/ET 3< -0.9.

12. The optical imaging system of any of claims 1 to 6, wherein an edge thickness ET5 of the fifth lens, an edge thickness ET6 of the sixth lens, an air separation T56 of the fifth lens and the sixth lens on the optical axis satisfy: 0.6< (ET 5+ ET 6)/T56 <2.5.

13. The optical imaging system of claim 7, wherein the second lens group moves a distance along the optical axis greater than 0.4 millimeters when the optical imaging system is switched from the first state to the second state or vice versa.