An optical imaging system

Abstract

The present invention discloses an optical imaging system, which includes, in order from the object side to the image side along the optical axis: an aperture; a first lens with optical focal power; a second lens with optical focal power; a third lens with optical focal power, whose image side surface is convex; a fourth lens with negative optical focal power; a fifth lens with optical focal power, whose object side surface is concave; a sixth lens with negative optical focal power; a seventh lens with optical focal power; wherein, half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfies: ImgH>5.0. By controlling half of the diagonal length of the effective pixel area on the imaging surface to be greater than 5, the characteristic of a large image surface of the optical system is achieved. The present invention provides an optical imaging system composed of seven lenses, which has the characteristics of effectively balancing the low-order aberrations of the system, reducing the sensitivity of tolerances, and achieving a large image surface of the optical system.

Description

Technical Field

[0001] The invention belongs to the field of optical imaging, and in particular relates to an optical imaging system comprising seven lenses. Background Art

[0002] With the advancement of technology, the rapid development of electronic products such as smart phones and tablets has made them more and more popular due to their portability, and the demand for thinner and lighter electronic products is increasing. However, consumers have higher expectations and more stringent requirements for the camera functions of portable electronic products. For wide-angle lenses, distortion has always been a pain point for such lenses, but with the market's expectations for wide-angle lenses with small distortion, it has also strongly promoted the development of technology.

[0003] Therefore, the present invention aims to provide a seven-element ultra-thin camera lens with high pixels, wide angle, small distortion and large image surface, which can better meet the usage requirements of various special scenes. Summary of the invention

[0004] The present invention aims to provide an optical imaging system composed of seven lenses, which has the characteristics of effectively balancing the low-order aberrations of the system, reducing the sensitivity of tolerances, and realizing a large image surface of the optical system.

[0005] The present invention provides an optical imaging system, which comprises, in order from the object side to the image side along the optical axis: an aperture; a first lens with optical power; a second lens with optical power; a third lens with optical power, whose image side surface is convex; a fourth lens with negative optical power; a fifth lens with optical power, whose object side surface is concave; a sixth lens with negative optical power; a seventh lens with optical power;

[0006] Among them, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>5.0.

[0007] According to one embodiment of the present invention, the on-axis distance TTL from the object side of the first lens to the imaging plane and half the diagonal length of the effective pixel area on the imaging plane ImgH satisfy: TTL / ImgH<1.4.

[0008] According to one embodiment of the present invention, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.9.

[0009] According to one embodiment of the present invention, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.5.

[0010] According to one embodiment of the present invention, the maximum field of view FOV of the optical imaging system is FOV>90°.

[0011] According to one embodiment of the present invention, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.5<f4 / f5<-3.0.

[0012] According to an embodiment of the present invention, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 1.0<f7 / f6<5.0.

[0013] According to one embodiment of the present invention, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens satisfy: 0.5<R1 / R2<3.7.

[0014] According to one embodiment of the present invention, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 1.0≤R3 / R4<1.5.

[0015] According to one embodiment of the present invention, the effective focal length f3 of the third lens and the curvature radius R6 of the image-side surface of the third lens satisfy: -2.0<f3 / R6<-1.0.

[0016] According to one embodiment of the present invention, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 1.0<R7 / R8<1.6.

[0017] According to one embodiment of the present invention, a curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 2.0<R9 / R10<2.5.

[0018] According to an embodiment of the present invention, the effective focal length f6 of the sixth lens and the curvature radius R12 of the image-side surface of the sixth lens satisfy: -2.5<f6 / R12<-1.0.

[0019] According to an embodiment of the present invention, a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: 2.5<CT5 / CT4<3.5.

[0020] According to an embodiment of the present invention, a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 3.0≤CT3 / CT2<4.0.

[0021] According to one embodiment of the present invention, the sum ∑AT of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface and the air interval T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.5<∑AT / T45<2.0.

[0022] According to one embodiment of the present invention, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.5<(CT5+CT6) / CT7<3.7.

[0023] According to one embodiment of the present invention, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.0<T45 / (T12+T67)<2.0.

[0024] According to one embodiment of the present invention, the effective focal length f of the optical imaging system and the center thickness CT1 of the first lens on the optical axis satisfy: 13.5<f / CT1<17.0.

[0025] The present invention also provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis: an aperture; a first lens with optical power; a second lens with optical power; a third lens with optical power, whose image side surface is convex; a fourth lens with negative optical power; a fifth lens with optical power, whose object side surface is concave; a sixth lens with negative optical power; a seventh lens with optical power;

[0026] The axial distance TTL from the object side of the first lens to the imaging plane and the half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfy the following conditions: TTL / ImgH<1.4.

[0027] According to one embodiment of the present invention, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>5.0.

[0028] According to one embodiment of the present invention, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.9.

[0029] According to one embodiment of the present invention, the on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy: TTL / f<1.5.

[0030] According to one embodiment of the present invention, the maximum field of view FOV of the optical imaging system is FOV>90°.

[0031] According to one embodiment of the present invention, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.5<f4 / f5<-3.0.

[0032] According to an embodiment of the present invention, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 1.0<f7 / f6<5.0.

[0033] According to one embodiment of the present invention, a curvature radius R1 of the object-side surface of the first lens and a curvature radius R2 of the image-side surface of the first lens satisfy: 0.5<R1 / R2<3.7.

[0034] According to one embodiment of the present invention, a curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 1.0≤R3 / R4<1.5.

[0035] According to one embodiment of the present invention, the effective focal length f3 of the third lens and the curvature radius R6 of the image-side surface of the third lens satisfy: -2.0<f3 / R6<-1.0.

[0036] According to one embodiment of the present invention, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: 1.0<R7 / R8<1.6.

[0037] According to one embodiment of the present invention, a curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 2.0<R9 / R10<2.5.

[0038] According to an embodiment of the present invention, the effective focal length f6 of the sixth lens and the curvature radius R12 of the image-side surface of the sixth lens satisfy: -2.5<f6 / R12<-1.0.

[0039] According to an embodiment of the present invention, a center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: 2.5<CT5 / CT4<3.5.

[0040] According to an embodiment of the present invention, a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 3.0≤CT3 / CT2<4.0.

[0041] According to one embodiment of the present invention, the sum ∑AT of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface and the air interval T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.5<∑AT / T45<2.0.

[0042] According to one embodiment of the present invention, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.5<(CT5+CT6) / CT7<3.7.

[0043] According to one embodiment of the present invention, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.0<T45 / (T12+T67)<2.0.

[0044] According to one embodiment of the present invention, the effective focal length f of the optical imaging system and the center thickness CT1 of the first lens on the optical axis satisfy: 13.5<f / CT1<17.0.

[0045] Beneficial effects of the present invention:

[0046] The optical imaging system provided by the present invention includes multiple lenses, such as the first lens to the seventh lens. By reasonably controlling the distribution of the focal power of each component of the system, the low-order aberrations of the system can be effectively balanced and the sensitivity of the tolerance can be reduced; by controlling the half of the diagonal length of the effective pixel area on the imaging surface to be greater than 5, the characteristic of the large image plane of the optical system can be achieved. By constraining the ratio of the total optical length and the half image height of the system to be less than 1.4, the characteristic of the system being ultra-thin can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 Schematic diagram of the lens group structure of embodiment 1 of the optical imaging system of the present invention;

[0049] Figure 2a to Figure 2d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the optical imaging system embodiment 1 of the present invention;

[0050] Figure 3 Schematic diagram of the lens group structure of embodiment 2 of the optical imaging system of the present invention;

[0051] Figures 4a to 4d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 2 of the optical imaging system of the present invention;

[0052] Figure 5 Schematic diagram of the lens group structure of embodiment 3 of the optical imaging system of the present invention;

[0053] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 3 of the optical imaging system of the present invention;

[0054] Figure 7 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention;

[0055] Figures 8a to 8d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 4 of the optical imaging system of the present invention;

[0056] Fig. 9 Schematic diagram of the lens group structure of embodiment 5 of the optical imaging system of the present invention;

[0057] Figures 10a to 10d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Embodiment 5 of the optical imaging system of the present invention;

[0058] Fig.11 Schematic diagram of the lens group structure of embodiment 6 of the optical imaging system of the present invention;

[0059] Figures 12a to 12d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of Example 6 of the optical imaging system of the present invention;

[0060] Fig.13 Schematic diagram of the structure of a lens group of an optical imaging system according to Embodiment 7 of the present invention;

[0061] Figures 14a to 14d They are respectively the axial chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of Example 7 of the optical imaging system of the present invention. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0063] It should be noted that in this 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 features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0064] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0065] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0066] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0067] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0069] Exemplary Embodiments

[0070] The optical imaging system of an exemplary embodiment of the present invention includes seven lenses, which include, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein each lens is independent of each other and has an air gap on the optical axis.

[0071] In this exemplary embodiment, the system includes, in order from the object side to the image side along the optical axis: an aperture; a first lens having optical power; a second lens having optical power; a third lens having optical power, whose image side surface is convex; a fourth lens having negative optical power; a fifth lens having optical power, whose object side surface is concave; a sixth lens having negative optical power; and a seventh lens having optical power. By reasonably controlling the distribution of the optical power of each component of the system, the low-order aberrations of the system can be effectively balanced and the sensitivity of tolerance can be reduced.

[0072] In this exemplary embodiment, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>5.0. By controlling half of the diagonal length of the effective pixel area on the imaging plane to be greater than 5, the characteristic of a large image plane of the optical system is achieved. More specifically, half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH>5.40.

[0073] In this exemplary embodiment, the axial distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.4. By constraining the ratio of the total optical length and the half image height of the system to be less than 1.4, the ultra-thin feature of the system can be achieved. More specifically, the axial distance TTL from the object side of the first lens to the imaging surface and half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy: TTL / ImgH<1.6.

[0074] In this exemplary embodiment, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD<1.9. By reasonably allocating the system's optical power, the F number of the system is made less than 1.9, and the large aperture characteristic of the system can be achieved. More specifically, the effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: f / EPD≤1.85.

[0075] In this exemplary embodiment, the on-axis distance TTL from the object side of the first lens to the imaging plane and the effective focal length f of the optical imaging system satisfy: TTL / f<1.5. By constraining the ratio of the on-axis distance from the object side of the first lens to the imaging plane to the effective focal length of the optical system to be less than 1.5, the miniaturization of the optical system is maintained. More specifically, the on-axis distance TTL from the object side of the first lens to the imaging plane and the effective focal length f of the optical imaging system satisfy: TTL / f≤1.49.

[0076] In this exemplary embodiment, the maximum field of view FOV of the optical imaging system is FOV>90°. By optimizing the optical system, the maximum field of view of the optical system is greater than 90 degrees, achieving the wide-angle characteristic of the system. More specifically, the maximum field of view FOV of the optical imaging system is FOV≥95°.

[0077] In this exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.5<f4 / f5<-3.50. By constraining the ratio of the effective focal lengths of the fourth lens and the fifth lens, the influence of the two lenses on the field curvature of the system can be reasonably controlled. More specifically, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.12≤f4 / f5≤-3.56.

[0078] In this exemplary embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 1.0<f7 / f6<5.0. By constraining the ratio of the effective focal lengths of the seventh lens and the sixth lens, the influence of the two lenses on the field curvature of the system can be reasonably controlled. More specifically, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 1.40<f7 / f6<4.60.

[0079] In this exemplary embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 0.5<R1 / R2<3.7. By controlling the radius of curvature of the object side of the first lens and the radius of curvature of the image side within a certain range, the deflection angle of the light at the edge of the system can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy: 0.8<R1 / R2<1.07.

[0080] In this exemplary embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 1.0≤R3 / R4<1.5. By controlling the radius of curvature of the object side of the second lens and the radius of curvature of the image side within a certain range, the deflection angle of the light at the edge of the system can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 1.14≤R3 / R4<1.4.

[0081] In this exemplary embodiment, the effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -2.0<f3 / R6<-1.0. By constraining the ratio of the effective focal length of the third lens and the curvature radius of the image side surface of the third lens, the contribution of the third lens to the spherical aberration of the system can be well controlled, so that the system has good imaging quality on the axis. More specifically, the effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1.90<f3 / R6<-1.40.

[0082] In this exemplary embodiment, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 1.0<R7 / R8<1.6. By controlling the radius of curvature of the object side of the fourth lens and the radius of curvature of the image side within a certain range, the deflection angle of the light at the edge of the system can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 1.35<R7 / R8<1.50.

[0083] In this exemplary embodiment, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 2.0<R9 / R10<2.5. By controlling the curvature radius of the object side of the fifth lens and the curvature radius of the image side within a certain range, the deflection angle of the light at the edge of the system can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, the curvature radius R9 of the object side of the fifth lens and the curvature radius R10 of the image side of the fifth lens satisfy: 2.05<R9 / R10<2.30.

[0084] In this exemplary embodiment, the effective focal length f6 of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -2.5<f6 / R12<-1.0. By constraining the ratio of the effective focal length of the sixth lens and the curvature radius of the image side surface of the third lens, the contribution of the sixth lens to the spherical aberration of the system can be well controlled, thereby compensating for the third-order spherical aberration generated by the lens, so that the system has good imaging quality on the axis. More specifically, the effective focal length f6 of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: -2.5<f6 / R12<-1.30.

[0085] In this exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 2.5<CT5 / CT4<3.5. By controlling the ratio of the center thickness of the fifth lens to the fourth lens, the distortion contribution of each field of view of the optical imaging lens is controlled within a reasonable range to improve the imaging quality. More specifically, the center thickness CT4 of the fourth lens on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 2.60<CT5 / CT4<3.30.

[0086] In this exemplary embodiment, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 3.0≤CT3 / CT2<4.0. By controlling the ratio of the center thickness of the third lens and the second lens, the distortion contribution of each field of view of the optical imaging lens is controlled within a reasonable range to improve the imaging quality. More specifically, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 3.0≤CT3 / CT2<3.45.

[0087] In this exemplary embodiment, the sum of the air spacing ∑AT on the optical axis between any two adjacent lenses with optical power in the lens closest to the imaging surface and the air spacing T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.5<∑AT / T45<2.0. By controlling this ratio within a certain range, the lens air gap can be reasonably configured, the gap sensitivity of the lens can be effectively reduced, and the lens field curvature can be corrected. More specifically, the sum of the air spacing ∑AT on the optical axis between any two adjacent lenses with optical power in the lens closest to the imaging surface and the air spacing T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.60<∑AT / T45<1.98.

[0088] In this exemplary embodiment, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.5<(CT5+CT6) / CT7<3.7. By controlling the product of the fifth lens, the sixth lens, and the seventh lens within a certain range, not only can the processability of the lens group be reasonably guaranteed, but also the contribution of the lens group to the spherical aberration of the optical system can be controlled, so that the system has good imaging quality on the system axis. More specifically, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.51<(CT5+CT6) / CT7<3.65.

[0089] In this exemplary embodiment, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.0<T45 / (T12+T67)<2.0. By constraining the ratio of the air interval between the fourth lens and the fifth lens on the optical axis to the air interval between the first lens and the second lens on the optical axis and the air interval between the sixth lens and the seventh lens on the optical axis within a certain range, the performance of the system field curvature can be reasonably controlled, so that the aberration of the system in the off-axis field of view is small. More specifically, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.20<T45 / (T12+T67)<1.85.

[0090] In this exemplary embodiment, the effective focal length f of the optical imaging system and the center thickness CT1 of the first lens on the optical axis satisfy: 13.5<f / CT1<17.0. By controlling the ratio of the effective focal length of the optical system to the center thickness of the first lens on the optical axis, the processability of the first lens and the spherical aberration contribution rate of the first lens can be reasonably guaranteed, so that the optical imaging lens axis system has good imaging quality. More specifically, the effective focal length f of the optical imaging system and the center thickness CT1 of the first lens on the optical axis satisfy: 13.60<f / CT1<16.90.

[0091] In this exemplary embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0092]

[0093] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0094] In this exemplary embodiment, the optical imaging system may further include a stop. The stop may be disposed at an appropriate position as required, for example, the stop may be disposed between the object side and the first lens. Optionally, the 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.

[0095] The optical imaging system according to the above embodiment of the present invention can use multiple lenses, such as the above seven lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the optical imaging system has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0096] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface. The characteristics of the aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical mirror surfaces.

[0097] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are used as an example in the embodiment, the optical imaging system is not limited to including seven lenses, and the optical imaging system may also include other numbers of lenses if necessary.

[0098] Specific embodiments of the optical imaging system applicable to the above embodiments are further described below with reference to the accompanying drawings. Specific embodiment 1

[0100] Figure 1 Schematic diagram of the lens group structure of embodiment 1 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0101] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0102] As shown in Table 1, it is a basic parameter table of the optical imaging system of Example 1, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0103]

[0104]

[0105] Table 1

[0106] As shown in Table 2, in Example 1, the total effective focal length of the optical imaging system is f=4.91 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.20 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0107]

[0108] Table 2

[0109] The optical imaging system in Example 1 satisfies:

[0110] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0111] TTL / ImgH=1.4, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0112] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0113] TTL / f=1.47, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0114] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0115] f4 / f5=-3.93, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0116] f7 / f6=1.47, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0117] R1 / R2=1.00, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0118] R3 / R4=1.25, where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0119] f3 / R6=-1.46, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0120] R7 / R8=1.43, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0121] R9 / R10=2.21, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0122] f6 / R12=-2.47, wherein f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0123] CT5 / CT4=2.69, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0124] CT3 / CT2=3.00, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0125] ∑AT / T45=1.68, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0126] (CT5+CT6) / CT7=2.83, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0127] T45 / (T12+T67)=1.78, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0128] f / CT1=13.99, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0129] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 3 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used 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 .

[0130]

[0131]

[0132] Table 3

[0133] Figure 2a The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 2b An astigmatism curve of the optical imaging system of Example 1 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 2c The distortion curve of the optical imaging system of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 2dThe magnification chromatic aberration curve of the optical imaging system of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figure 2a to Figure 2d It can be seen from the figure that the optical imaging system provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0135] Figure 3 Schematic diagram of the lens group structure of embodiment 2 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0136] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0137] As shown in Table 4, it is a basic parameter table of the optical imaging system of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0138]

[0139]

[0140] Table 4

[0141] As shown in Table 5, in Example 2, the total effective focal length of the optical imaging system is f=4.91 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.20 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0142]

[0143] Table 5

[0144] The optical imaging system in Example 2 satisfies:

[0145] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0146] TTL / ImgH=1.4, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0147] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0148] TTL / f=1.47, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0149] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0150] f4 / f5=-3.93, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0151] f7 / f6=2.74, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0152] R1 / R2=1.04, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0153] R3 / R4=1.17, where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0154] f3 / R6=-1.44, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0155] R7 / R8=1.42, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0156] R9 / R10=2.16, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0157] f6 / R12=-2.47, wherein f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0158] CT5 / CT4=2.78, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0159] CT3 / CT2=3.04, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0160] ∑AT / T45=1.73, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0161] (CT5+CT6) / CT7=3.00, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0162] T45 / (T12+T67)=1.74, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0163] f / CT1=14.29, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0164] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 6 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 2. 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 .

[0165]

[0166]

[0167] Table 6

[0168] Figure 4aThe axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4b An astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4c The distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4d The magnification chromatic aberration curve of the optical imaging system of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 4a to 4d It can be seen from the figure that the optical imaging system provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0170] Figure 5 Schematic diagram of the lens group structure of embodiment 3 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0171] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0172] As shown in Table 7, it is a basic parameter table of the optical imaging system of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0173]

[0174]

[0175] Table 7

[0176] As shown in Table 8, in Example 3, the total effective focal length of the optical imaging system is f=4.92 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.24 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0177]

[0178] Table 8

[0179] The optical imaging system in Example 3 satisfies:

[0180] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0181] TTL / ImgH=1.33, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0182] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0183] TTL / f=1.47, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0184] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0185] f4 / f5=-3.81, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0186] f7 / f6=2.74, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0187] R1 / R2=1.03, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0188] R3 / R4=1.19, where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0189] f3 / R6=-1.43, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0190] R7 / R8=1.41, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0191] R9 / R10=2.11, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0192] f6 / R12=-2.16, wherein f6 is the effective focal length of the sixth lens element, and R12 is the radius of curvature of the image side surface of the sixth lens element.

[0193] CT5 / CT4=2.91, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0194] CT3 / CT2=3.10, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0195] ∑AT / T45=1.77, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0196] (CT5+CT6) / CT7=2.97, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0197] T45 / (T12+T67)=1.79, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0198] f / CT1=14.60, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0199] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 9 shows the high-order coefficients A of the aspherical mirror surfaces S1-S14 that can be used in Example 3. 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A24 , A 26 , A 28 and A 30 .

[0200]

[0201]

[0202] Table 9

[0203] Figure 6a The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b An astigmatism curve of the optical imaging system of Example 3 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 6c The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6d The magnification chromatic aberration curve of the optical imaging system of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 6a to 6d It can be seen from the figure that the optical imaging system provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0205] Figure 7 Schematic diagram of the lens group structure of embodiment 4 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0206] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0207] As shown in Table 10, it is a basic parameter table of the optical imaging system of Example 4, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0208]

[0209] Table 10

[0210] As shown in Table 11, in Example 4, the total effective focal length of the optical imaging system is f=4.93 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.29 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0211]

[0212] Table 11

[0213] The optical imaging system in Example 4 satisfies:

[0214] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0215] TTL / ImgH=1.34, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0216] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0217] TTL / f=1.48, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0218] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0219] f4 / f5=-3.56, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0220] f7 / f6=4.55, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0221] R1 / R2=1.01, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0222] R3 / R4=1.23, where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0223] f3 / R6=-1.46, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0224] R7 / R8=1.43, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0225] R9 / R10=2.10, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0226] f6 / R12=-2.08, wherein f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0227] CT5 / CT4=3.02, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0228] CT3 / CT2=3.36, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0229] ∑AT / T45=1.96, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0230] (CT5+CT6) / CT7=2.97, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0231] T45 / (T12+T67)=1.31, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0232] f / CT1=16.71+, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0233] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 12 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 4.4 , 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 .

[0234]

[0235]

[0236] Table 12

[0237] Figure 8a The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 8b An astigmatism curve of the optical imaging system of Example 4 is shown, which indicates meridional field curvature and sagittal field curvature. Figure 8c The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8d The magnification chromatic aberration curve of the optical imaging system of Example 4 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 8a to 8d It can be seen from the figure that the optical imaging system provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0239] Fig. 9 Schematic diagram of the lens group structure of embodiment 5 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0240] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0241] As shown in Table 13, it is a basic parameter table of the optical imaging system of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0242]

[0243] Table 13

[0244] As shown in Table 14, in Example 5, the total effective focal length f of the optical imaging system is 4.92 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.35 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0245]

[0246] Table 14

[0247] The optical imaging system in Example 5 satisfies:

[0248] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0249] TTL / ImgH=1.35, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0250] f / EPD=1.76, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0251] TTL / f=1.49, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0252] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0253] f4 / f5=-4.12, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0254] f7 / f6=3.60, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0255] R1 / R2=0.93, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0256] R3 / R4=1.23, where R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0257] f3 / R6=-1.51, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0258] R7 / R8=1.38, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0259] R9 / R10=2.18, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0260] f6 / R12=-1.37, wherein f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0261] CT5 / CT4=2.65, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0262] CT3 / CT2=3.32, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0263] ∑AT / T45=1.79, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0264] (CT5+CT6) / CT7=2.86, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0265] T45 / (T12+T67)=1.50, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0266] f / CT1=16.27, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0267] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 15 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 5. 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 .

[0268]

[0269]

[0270] Table 15

[0271] Fig.10a The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.10b An astigmatism curve of the optical imaging system of Example 5 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.10c The distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.10d The magnification chromatic aberration curve of the optical imaging system of Example 5 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 10a to 10d It can be seen from the figure that the optical imaging system provided in Example 5 can achieve good imaging quality. Specific embodiment 6

[0273] Fig.11Schematic diagram of the lens group structure of embodiment 6 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0274] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0275] As shown in Table 16, it is a basic parameter table of the optical imaging system of Example 6, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0276]

[0277] Table 16

[0278] As shown in Table 17, in Example 6, the total effective focal length f of the optical imaging system is 4.89 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.20 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0279]

[0280]

[0281] Table 17

[0282] The optical imaging system in Example 6 satisfies:

[0283] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0284] TTL / ImgH=1.32, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0285] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0286] TTL / f=1.47, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0287] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0288] f4 / f5=-3.59, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0289] f7 / f6=2.26, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0290] R1 / R2=0.85, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0291] R3 / R4=1.21, wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

[0292] f3 / R6=-1.85, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0293] R7 / R8=1.43, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0294] R9 / R10=2.07, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0295] f6 / R12=-2.22, wherein f6 is the effective focal length of the sixth lens element, and R12 is the radius of curvature of the image side surface of the sixth lens element.

[0296] CT5 / CT4=2.70, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0297] CT3 / CT2=3.44, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0298] ∑AT / T45=1.92, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0299] (CT5+CT6) / CT7=2.54, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0300] T45 / (T12+T67)=1.37, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0301] f / CT1=15.72, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0302] In Example 6, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 18 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 6. 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 .

[0303]

[0304]

[0305] Table 18

[0306] Fig.12a The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 12b An astigmatism curve of the optical imaging system of Example 6 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.12c The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.12dThe magnification chromatic aberration curve of the optical imaging system of Example 6 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 12a to 12d It can be seen from the figure that the optical imaging system provided in Example 6 can achieve good imaging quality. Specific embodiment 7

[0308] Fig.13 Schematic diagram of the lens group structure of embodiment 7 of the optical imaging system of the present invention. The optical imaging system includes, in order from the object side to the image side along the optical axis: an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0309] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0310] As shown in Table 19, it is a basic parameter table of the optical imaging system of Example 7, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0311]

[0312] Table 19

[0313] As shown in Table 20, in Example 7, the total effective focal length of the optical imaging system is f=4.91 mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging system is 7.20 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=5.46 mm. Semi-FOV, which is half of the maximum field of view of the optical imaging lens, is 47.5°.

[0314]

[0315]

[0316] Table 20

[0317] The optical imaging system in Example 7 satisfies:

[0318] ImgH=5.46. Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0319] TTL / ImgH=1.32, where TTL is the axial distance from the object side of the first lens to the imaging plane, and ImgH is half of the diagonal length of the effective pixel area on the imaging plane.

[0320] f / EPD=1.85, where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0321] TTL / f=1.47, where TTL is the axial distance from the object side of the first lens to the imaging surface, and f is the effective focal length of the optical imaging system.

[0322] FOV=95.0, where FOV is the maximum field of view of the optical imaging system.

[0323] f4 / f5=-3.80, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.

[0324] f7 / f6=2.66, wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0325] R1 / R2=1.06, wherein R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0326] R3 / R4=1.14, wherein R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.

[0327] f3 / R6=-1.43, wherein f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0328] R7 / R8=1.41, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens.

[0329] R9 / R10=2.12, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens.

[0330] f6 / R12=-2.18, wherein f6 is the effective focal length of the sixth lens element, and R12 is the radius of curvature of the image side surface of the sixth lens element.

[0331] CT5 / CT4=2.86, wherein CT4 is the center thickness of the fourth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.

[0332] CT3 / CT2=3.05, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

[0333] ∑AT / T45=1.75, wherein ∑AT is the sum of the air intervals on the optical axis between any two adjacent lenses having optical power from the first lens to the lens closest to the imaging surface, and T45 is the air interval on the optical axis between the fourth lens and the fifth lens.

[0334] (CT5+CT6) / CT7=3.13, wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis.

[0335] T45 / (T12+T67)=1.72, wherein T12 is the air interval between the first lens and the second lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.

[0336] f / CT1=14.17, wherein f is the effective focal length of the optical imaging system, and CT1 is the center thickness of the first lens on the optical axis.

[0337] In Example 7, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 21 shows the high-order coefficients A of the aspherical mirror surfaces S1 to S14 that can be used in Example 7. 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 .

[0338] Face number A4 A6 A8 A10 A12 A14 A16 S1 -9.8423E-02 -1.3826E-02 -1.5473E-03 4.6924E-05 2.2129E-05 -1.9870E-06 1.3231E-05 S2 -1.8300E-01 -2.0491E-02 -2.9761E-04 1.9188E-03 4.6706E-04 -1.0330E-04 -6.1667E-05 S3 -2.6383E-01 9.9500E-03 1.5122E-03 1.0764E-03 1.7547E-04 -1.2684E-04 -5.0031E-05 S4 -2.5516E-01 1.3469E-02 1.5289E-03 -1.2475E-03 -2.0621E-04 1.4543E-05 9.9897E-05 S5 -6.0685E-02 -2.3713E-02 -3.5464E-04 -1.5029E-03 2.9496E-04 3.5673E-04 2.2577E-04 S6 4.1947E-02 -2.1492E-02 -1.4619E-03 -4.3382E-04 3.4251E-04 2.8168E-04 1.7840E-04 S7 -4.9096E-01 2.6911E-02 -7.2012E-04 -1.2652E-03 -1.5131E-03 2.6601E-05 -8.0861E-05 S8 -5.0153E-01 6.3954E-02 -1.0867E-02 9.6155E-04 -1.6691E-03 5.0411E-04 -1.0354E-04 S9 4.0539E-01 5.0126E-02 -4.6757E-03 -3.0472E-03 1.0741E-03 -1.9001E-04 -1.1972E-04 S10 8.5028E-01 8.1034E-03 2.8296E-02 -9.1647E-03 -3.6086E-04 8.8130E-04 -9.7792E-05 S11 -1.3256E+00 1.0524E-01 -3.6408E-02 2.6967E-02 -5.6513E-03 6.2205E-03 -1.7505E-03 S12 -4.6342E+00 8.0647E-01 -2.5676E-01 1.1903E-01 -4.7614E-02 2.6556E-02 -1.6305E-02 S13 -4.6846E-01 5.8109E-02 6.6583E-02 -3.0124E-02 2.7087E-02 -2.3795E-02 1.1696E-02 S14 -2.2218E+00 1.0185E-01 1.4539E-02 -2.0578E-02 3.4786E-02 -2.0994E-02 1.3786E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 7.5503E-07 -8.7026E-07 -3.9698E-06 -3.8418E-06 5.4997E-07 1.6561E-06 -2.0350E-07 S2 -5.3878E-05 -1.0015E-05 -2.9270E-05 -2.0879E-05 -2.6411E-05 -8.3894E-06 -6.2267E-06 S3 -1.1755E-05 -2.6972E-05 -2.1784E-05 -2.5482E-05 -1.1362E-05 -4.8429E-06 3.8965E-06 S4 4.3152E-05 4.9523E-06 5.9699E-06 -1.7117E-07 -1.2323E-06 -4.3648E-06 -1.1909E-06 S5 8.8851E-05 1.9892E-05 -5.0880E-06 -1.0619E-05 -1.1583E-05 -6.5109E-06 -3.0765E-06 S6 7.7181E-05 2.8557E-05 -2.5745E-07 -9.5832E-06 -1.0792E-05 -6.9366E-06 -1.3733E-06 S7 3.7294E-06 -1.4705E-05 -1.5320E-06 -1.6030E-06 -1.8469E-06 -8.6698E-08 -7.2340E-07 S8 7.4430E-05 -2.3113E-06 4.1342E-06 2.1235E-06 -2.2605E-06 2.4464E-06 -1.8820E-06 S9 -1.1434E-04 4.4872E-05 -1.5395E-05 2.1793E-06 5.9469E-06 3.3578E-06 3.3364E-06 S10 -1.4331E-04 -9.0738E-05 3.2480E-05 -5.9487E-06 -9.6000E-06 8.7281E-06 1.4902E-06 S11 7.6685E-05 -3.6574E-04 -4.9550E-05 6.1888E-05 7.5654E-05 3.7935E-05 1.3272E-06 S12 3.3397E-03 -1.0727E-03 1.5405E-03 -7.2002E-04 -6.6573E-05 -2.1542E-04 3.9261E-05 S13 -8.0936E-03 9.2712E-03 -6.2178E-03 1.7147E-03 -1.7376E-04 -2.1116E-04 6.6757E-05 S14 -7.1855E-03 5.2590E-03 -3.1430E-03 9.5994E-04 5.9732E-04 1.9711E-04 2.6199E-04

[0339] Table 21

[0340] Fig.14a The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.14b An astigmatism curve of the optical imaging system of Example 7 is shown, which indicates meridional field curvature and sagittal field curvature. Fig.14c The distortion curve of the optical imaging system of Example 7 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.14d The magnification chromatic aberration curve of the optical imaging system of Example 7 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. Figures 14a to 14d It can be seen from the figure that the optical imaging system provided in Example 7 can achieve good imaging quality.

[0341] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical imaging system, It is characterized in that The optical imaging system has seven lenses with optical power, and the optical imaging system includes, in order from the object side to the image side along the optical axis: Aperture; A first lens having positive or negative optical power, whose object side surface is convex and whose image side surface is concave; The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; A third lens element having positive refractive power and a convex image-side surface; a fourth lens element having negative optical power, whose object side surface is convex and whose image side surface is concave; A fifth lens having positive refractive power, whose object side surface is concave and image side surface is convex; a sixth lens element having negative optical power, whose image side surface is concave; The seventh lens element has a negative optical power and its image side surface is concave; The object side surface of the third lens is convex, the object side surface of the sixth lens is convex, and the object side surface of the seventh lens is concave; or the object side surface of the third lens is convex, the object side surface of the sixth lens is convex, and the object side surface of the seventh lens is convex; or the object side surface of the third lens is convex, the object side surface of the sixth lens is concave, and the object side surface of the seventh lens is convex; or the object side surface of the third lens is concave, the object side surface of the sixth lens is convex, and the object side surface of the seventh lens is concave; The axial distance TTL from the object side of the first lens to the imaging surface and the half of the diagonal length of the effective pixel area on the imaging surface ImgH satisfy the following: 1.32≤TTL / ImgH≤1.35; The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy: 1.47≤f7 / f6≤4.

55.

2. The optical imaging system according to claim 1, Features: Half of the diagonal length of the effective pixel area on the imaging plane ImgH satisfies: ImgH=5.

46.

3. The optical imaging system according to claim 1, Features: The effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy: 1.76≤f / EPD≤1.

85.

4. The optical imaging system according to claim 1, Features: The on-axis distance TTL from the object side surface of the first lens to the imaging surface and the effective focal length f of the optical imaging system satisfy the following: 1.47≤TTL / f<1.

5.

5. The optical imaging system according to claim 1, Features: The maximum field of view FOV of the optical imaging system is FOV=95°.

6. The optical imaging system according to claim 1, Features: The effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -4.12≤f4 / f5≤-3.

56.

7. The optical imaging system according to claim 1, Features: A curvature radius R1 of the object side surface of the first lens and a curvature radius R2 of the image side surface of the first lens satisfy: 0.85≤R1 / R2≤1.

06.

8. The optical imaging system according to claim 1, Features: A curvature radius R3 of the object side surface of the second lens and a curvature radius R4 of the image side surface of the second lens satisfy: 1.14≤R3 / R4≤1.

34.

9. The optical imaging system according to claim 1, Features: The effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -1.85≤f3 / R6≤-1.

43.

10. The optical imaging system according to claim 1, Features: A curvature radius R7 of the object side surface of the fourth lens and a curvature radius R8 of the image side surface of the fourth lens satisfy: 1.38≤R7 / R8≤1.

43.

11. The optical imaging system according to claim 1, Features: A curvature radius R9 of the object side surface of the fifth lens and a curvature radius R10 of the image side surface of the fifth lens satisfy: 2.07≤R9 / R10≤2.

21.

12. The optical imaging system according to claim 1, Features: The effective focal length f6 of the sixth lens and the curvature radius R12 of the image-side surface of the sixth lens satisfy: -2.5<f6 / R12≤-1.

37.

13. The optical imaging system according to claim 1, Features: A center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: 2.65≤CT5 / CT4≤3.

02.

14. The optical imaging system according to claim 1, Features: A center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 3.0≤CT3 / CT2≤3.

44.

15. The optical imaging system according to claim 1, Features: The sum of the air intervals ΣAT on the optical axis between any two adjacent lenses with optical power from the first lens to the lens closest to the imaging surface and the air interval T45 on the optical axis between the fourth lens and the fifth lens satisfy: 1.68≤ΣAT / T45<2.

0.

16. The optical imaging system according to claim 1, Features: A center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.5<(CT5+CT6) / CT7≤3.

61.

17. The optical imaging system according to claim 1, Features: An air interval T12 between the first lens and the second lens on the optical axis, an air interval T45 between the fourth lens and the fifth lens on the optical axis, and an air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 1.31≤T45 / (T12+T67)≤1.

79.

18. The optical imaging system according to claim 1, Features: The effective focal length f of the optical imaging system and the central thickness CT1 of the first lens on the optical axis satisfy: 13.99≤f / CT1≤16.71.

Images