Optical imaging lens

Abstract

The present application relates to a kind of optical imaging lenses, including first lens barrel, second lens barrel, lens group, multiple spacer elements;Lens group is sequentially first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens along optical axis from object side to image side, total seven lenses with optical power;First lens, second lens, third lens and fourth lens are housed in first lens barrel, fifth lens, sixth lens and seventh lens are housed in second lens barrel;Optical imaging lens satisfies:-1.05≤f1234 / f567≤-0.90, 2.00<(CT1+CT2) / T12<5.15;3.60<d1s / (CT1*N1)<3.95.The optical imaging lens of the present application can be in compact space Realize the stable, accurate focusing under each focusing state from the nearest to infinity object distance.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and more particularly to an optical imaging lens. Background Technology

[0002] With the rapid development of consumer electronics and professional imaging equipment, users have placed higher demands on the imaging quality, focusing performance, and structural size of optical systems. In miniaturized devices such as smartphones, drones, and action cameras, due to space constraints, optical systems must achieve clear imaging and efficient focusing from close range to infinity within an extremely compact lens structure.

[0003] Currently, traditional focusing structures, in order to meet the demand for miniaturization, typically minimize the air gaps between lenses. However, this design strategy often negatively impacts the lens's aberration correction capabilities. For example, an improper focal length match between the front and rear lens groups can disrupt aberration balance during focusing, thus reducing image sharpness. Furthermore, simply reducing the lens spacing to shorten the overall lens length can introduce new structural problems. Specifically, when the air gap between the first and second lenses is designed to be too small, while this helps shorten the lens length, in actual assembly, the excessively small gap can cause the first and second lenses to become misaligned or tilted during installation. This assembly tolerance can lead to optical axis misalignment, affecting the normal propagation of light between the first and second lenses, thereby reducing the lens's resolution and image quality. Simultaneously, stress is more likely to concentrate between the lenses, causing unintended deformation.

[0004] On the other hand, if the air gap between the first lens and the second lens is simply increased in order to improve the assembly process, although the assembly difficulty may be alleviated, it is easy to introduce stray light from the edges and reduce the coaxiality of the lens assembly.

[0005] Therefore, how to rationally configure the thickness and spacing of the first and second lenses while ensuring lens miniaturization, and also take into account their cooperation with surrounding structural components, in order to suppress stray light, improve structural stability and ensure imaging effect, is a technical problem that urgently needs to be solved in the field of lens design. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention aims to provide an optical imaging lens that can ensure imaging quality while miniaturizing the focusing lens.

[0007] To achieve the above-mentioned objective, the present invention provides an optical imaging lens, comprising a first lens barrel, a second lens barrel, a lens group, and a plurality of spacers. The first and second lens barrels are used to house the lens group and the plurality of spacers. The lens group consists of, in sequence along the optical axis from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power, totaling seven lenses with optical power. The first, second, third, and fourth lenses are housed in the first lens barrel, and the fifth, sixth, and seventh lenses are housed in the second lens barrel. When the object distance of the optical imaging lens changes from infinity to micro, the first and second lens barrels undergo relative displacement, and the air gap between the image side of the fourth lens and the object side of the fifth lens along the optical axis increases.

[0008] The plurality of spacers includes: a first spacer, which is placed between the first lens and the second lens and contacts the image side of the first lens;

[0009] The optical imaging lens satisfies:

[0010] -1.05≤f1234 / f567≤-0.90, 2.00<(CT1+CT2) / T12<5.15;

[0011] 3.60 <d1s / (CT1*N1)<3.95;

[0012] Wherein, f1234 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, f567 is the combined focal length of the fifth lens, the sixth lens and the seventh lens, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, T12 is the spacing between the first lens and the second lens along the optical axis, d1s is the inner diameter of the object side of the first spacer element, and N1 is the refractive index of the first lens.

[0013] According to one technical solution of the present invention, the plurality of spacer elements further include:

[0014] The second spacer element is placed between the second lens and the third lens and is in contact with the image side of the second lens;

[0015] The third spacer element is placed between the third lens and the fourth lens and is in contact with the image side of the third lens;

[0016] The fifth spacer element is placed between the fifth lens and the sixth lens and is in contact with the image side of the fifth lens;

[0017] A sixth spacer element is placed between the sixth lens and the seventh lens and is in contact with the image side of the sixth lens;

[0018] The maximum outer diameter of the first to the third spacer elements decreases in a step-like manner, while the maximum outer diameter of the fifth to the sixth spacer elements increases in a step-like manner.

[0019] According to one technical solution of the present invention, the inner diameter of the object-side end face of the first lens barrel is larger than the outer diameter of the first lens;

[0020] The optical imaging lens satisfies: 0.15 < (d10s - d1s) / f1 < 0.25;

[0021] Wherein, d10s is the inner diameter of the object-side end face of the first lens barrel, d1s is the inner diameter of the object-side side face of the first spacer element, and f1 is the effective focal length of the first lens.

[0022] According to one technical solution of the present invention, the optical imaging lens satisfies: 9.70≤f1 / EP101<11.40;

[0023] Wherein, EP101 is the distance along the optical axis from the object-side end face of the first lens barrel to the object-side surface of the first spacer element, and f1 is the effective focal length of the first lens.

[0024] According to one technical solution of the present invention, the optical imaging lens satisfies: 0.65 <EP101 / EP205<1.05;

[0025] Wherein, EP101 is the distance along the optical axis between the object side of the first lens barrel and the object side of the first spacer element, and EP205 is the distance along the optical axis between the object side of the second lens barrel and the object side of the fifth spacer element.

[0026] According to one technical solution of the present invention, in the lens group, the fourth lens has the largest center thickness;

[0027] The optical imaging lens satisfies: -13.85 <d3m / (R7+R8)<-6.45;

[0028] Wherein, d3m is the inner diameter of the image side of the third spacer element, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0029] According to one technical solution of the present invention, the optical imaging lens satisfies: 0.25 < (d10m - d3m) / f4 < 0.45;

[0030] Wherein, d3m is the inner diameter of the image side of the third spacer element, d10m is the inner diameter of the image side of the first lens barrel, and f4 is the effective focal length of the fourth lens.

[0031] According to one technical solution of the present invention, the optical imaging lens satisfies: -0.20 < (d20s - d5s) / f5 ≤ -0.10;

[0032] Wherein, d20s is the inner diameter of the object-side end face of the second lens barrel, d5s is the inner diameter of the image-side face of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

[0033] According to one technical solution of the present invention, the optical imaging lens satisfies: 0.90≤(EP205+EP56) / Tr9r12<1.10;

[0034] Wherein, EP205 is the distance between the object side of the second lens barrel and the object side of the fifth spacer element along the optical axis, and Tr9r12 is the distance between the object side of the fifth lens and the image side of the sixth lens along the optical axis.

[0035] According to one technical solution of the present invention, the optical imaging lens satisfies: 0.75 < (D6s - d6s) / DT62 < 1.05;

[0036] Wherein, d6s is the inner diameter of the object side of the sixth spacer element, D6s is the outer diameter of the object side of the sixth spacer element, and DT62 is the maximum effective radius of the image side of the sixth lens.

[0037] According to one technical solution of the present invention, the plurality of spacers further includes: a sixth auxiliary spacer, disposed between the sixth spacer and the seventh lens and in contact with the image side of the sixth spacer;

[0038] The optical imaging lens satisfies: 0.35 <CP6b / T67<0.85;

[0039] Wherein, CP6b is the center thickness of the sixth auxiliary spacer element, and T67 is the air gap on the optical axis between the image side of the sixth lens and the object side of the seventh lens.

[0040] The beneficial effects of this invention are:

[0041] In the optical imaging lens of the present invention, the fifth lens, the sixth lens and the seventh lens are moved simultaneously to achieve the focusing effect by changing the distance between the fourth lens and the fifth lens and the distance between the seventh lens and the image plane. By restricting the optical imaging lens to satisfy -1.05≤f1234 / f567≤-0.90, a reasonable focal length matching of the front and rear lens groups is realized, so that the aberration of the lens remains balanced during the focusing process. At the same time, by controlling the first two lenses of the first lens group to satisfy 2.00<(CT1+CT2) / T12<5.15, the center thicknesses of the first lens and the second lens and the air gap distance therebetween are limited, which is more conducive to meeting the miniaturization requirement of the lens. However, since the air gap between the first lens and the second lens has a certain size at this time, risks such as eccentricity and inclination of the first lens and the second lens during assembly are likely to occur, which affects the propagation of light between the first lens and the second lens, thereby affecting the imaging quality of the optical lens. At this time, by restricting the optical imaging lens to satisfy 3.60<d1s / (CT1*N1)<3.95, the inner diameter of the first spacing element and the optical path of light passing through the first lens can be balanced. On the one hand, the propagation path of light between the first lens and the second lens can suppress the edge stray light between the first lens and the second lens, and at the same time, the assembly stress is uniformly dispersed, the lens deformation is avoided, the structural stability of the first lens assembly is improved, and the imaging effect of the lens is ensured. Brief Description of the Drawings

[0042] In order to more clearly illustrate the implementations of the present invention or the technical solutions in the prior art, the drawings required for use in the implementations will be briefly introduced below.

[0043] Figure 1 shows a schematic diagram of the lens structure arrangement and partial parameters of an optical imaging lens according to the present invention;

[0044] Figure 2A , Figure 2B and Figure 2C show schematic structural diagrams of three optical imaging lenses according to the first embodiment of the present invention at a far shooting position;

[0045] Figure 2D , Figure 2E and Figure 2F show schematic structural diagrams of three optical imaging lenses according to the first embodiment of the present invention at a near shooting position;

[0046] Figure 2-1.1 , Figure 2-1.2 and Figure 2-1.3 respectively show the axial chromatic aberration curve, the astigmatism curve and the distortion curve of three optical imaging lenses according to the first embodiment of the present invention at a far shooting position;

[0047] Figure 2-2.1 , Figure 2-2.2and Figure 2-2.3 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of three optical imaging lenses according to Embodiment 1 of the present invention are shown at close-up positions.

[0048] Figure 3A , Figure 3B and Figure 3C A schematic diagram of the structure of three optical imaging lenses according to Embodiment 2 of the present invention at a telephoto position is shown;

[0049] Figure 3D , Figure 3E and Figure 3F A schematic diagram of the structure of three optical imaging lenses according to Embodiment 2 of the present invention in a close-up position is shown;

[0050] Figure 3-1.1 , Figure 3-1.2 and Figure 3-1.3 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of three optical imaging lenses according to Embodiment 2 of the present invention are shown at the telephoto position.

[0051] Figure 3-2.1 , Figure 3-2.2 and Figure 3-2.3 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of three optical imaging lenses according to Embodiment 2 of the present invention are shown at close-up positions.

[0052] Figure 4A , Figure 4B and Figure 4C The diagram shows the structure of three optical imaging lenses in a telephoto position according to Embodiment 3 of the present invention;

[0053] Figure 4D , Figure 4E and Figure 4F The diagram shows the structure of three optical imaging lenses in close-up position according to Embodiment 3 of the present invention;

[0054] Figure 4-1.1 , Figure 4-1.2 and Figure 4-1.3 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of three optical imaging lenses according to Embodiment 3 of the present invention are shown at the telephoto position.

[0055] Figure 4-2.1 , Figure 4-2.2 and Figure 4-2.3 The on-axis chromatic aberration curves, astigmatism curves, and distortion curves of three optical imaging lenses according to Embodiment 3 of the present invention are shown at close-up positions.

[0056] Figure 5A and Figure 5BThe diagrams show the defocus curves of an optical imaging lens at the telephoto and close-up positions when the following conditions are met: f1234 / f567=-0.93, (CT1+CT2) / T12=4.25, and d1s / (CT1*N1)=4.17.

[0057] Figure 6A and Figure 6B The diagrams show the defocus curves of the optical imaging lens of the present invention at the far-field and near-field positions when the following conditions are met: f1234 / f567=-0.93, (CT1+CT2) / T12=4.25 and d1s / (CT1*N1)=3.65.

[0058] Figure 7A and Figure 7B The diagrams show the defocus curves of an optical imaging lens at both the telephoto and close-up positions when the following conditions are met: f1234 / f567 = -0.93, (CT1+CT2) / T12 = 4.25, and d1s / (CT1*N1) = 3.42. Detailed Implementation

[0059] To better understand the invention, various aspects of the invention will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of the invention and are not intended to limit the scope of the invention in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0060] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0061] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0062] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the image plane is called the image-side surface of the lens. The surface of each lens that connects its object-side surface and its image-side surface is called the outer peripheral surface.

[0063] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of the invention, the word "may" is used to mean "one or more embodiments of the invention." And the term "exemplary" is intended to refer to an example or illustration.

[0064] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense, unless expressly so defined herein.

[0065] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this invention can be combined with each other. The following embodiments only illustrate several implementation methods of this invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this invention, and these all fall within the protection scope of this invention.

[0066] like Figure 1As shown, the optical imaging lens of an exemplary embodiment of the present invention includes a first lens barrel, a second lens barrel, a lens group, and a plurality of spacer elements. The first and second lens barrels are used to house the lens group and the plurality of spacer elements. The lens group includes seven lenses, which are arranged sequentially along the optical axis from the object side to the image side as follows: a first lens with positive optical power, a second lens with negative optical power, a third lens with either positive or negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. The first, second, third, and fourth lenses are housed in the first lens barrel to form a front-end optical system; the fifth, sixth, and seventh lenses are housed in the second lens barrel to form a rear-end optical system.

[0067] The first to seventh lenses are arranged sequentially along the optical axis from the subject side to the imaging plane side. Each lens has at least one object side facing the subject side and one image side facing the imaging plane side, and there is an air gap between adjacent lenses.

[0068] The plurality of spacer elements includes at least: a first spacer element disposed between a first lens and a second lens and in contact with the image-side surface of the first lens; a second spacer element disposed between a second lens and a third lens and in contact with the image-side surface of the second lens; a third spacer element disposed between a third lens and a fourth lens and in contact with the image-side surface of the third lens; a fifth spacer element disposed between a fifth lens and a sixth lens and in contact with the image-side surface of the fifth lens; and a sixth spacer element disposed between a sixth lens and a seventh lens and in contact with the image-side surface of the sixth lens. Wherein, "contact" means at least partial contact.

[0069] The lens group and multiple spacer elements are housed within the lens barrel. The first lens, second lens, third lens, and fourth lens, as well as the first, second, and third spacer elements, are housed within the first lens barrel, while the fifth, sixth, and seventh lens, as well as the fifth and sixth spacer elements, are housed within the second lens barrel. Both the first and second lens barrels include an object-side end face, an image-side end face, and an inner annular surface.

[0070] In some embodiments of the present invention, the optical imaging lens may further include color filters and / or protective glass.

[0071] In some embodiments of the present invention, the optical imaging lens satisfies: -1.05≤f1234 / f567≤-0.90, 2.00<(CT1+CT2) / T12<5.15; 3.60<d1s / (CT1*N1)<3.95; where f1234 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, f567 is the combined focal length of the fifth lens, the sixth lens and the seventh lens, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, T12 is the spacing distance between the first lens and the second lens along the optical axis direction, d1s is the inner diameter of the object side of the first spacing element, and N1 is the refractive index of the first lens.

[0072] The optical imaging lens of the present invention achieves the focusing effect by changing the distance between the fourth lens and the fifth lens and the distance between the seventh lens and the image plane to move the fifth lens, the sixth lens and the seventh lens simultaneously. By restricting the optical imaging lens to satisfy -1.05≤f1234 / f567≤-0.90, a reasonable focal length matching of the front and rear lens groups is realized, so that the aberration of the lens remains balanced during the focusing process. At the same time, by controlling the first two lenses of the first lens group to satisfy 2.00<(CT1+CT2) / T12<5.15, the center thicknesses of the first lens and the second lens and the air gap distance therebetween are limited, which is more conducive to meeting the miniaturization requirement of the lens. However, since the air gap between the first lens and the second lens has a certain size at this time, risks such as eccentricity and inclination of the first lens and the second lens are likely to occur during assembly, which affects the propagation of light between the first lens and the second lens, thereby affecting the imaging quality of the optical lens. At this time, by restricting the optical imaging lens to satisfy 3.60<d1s / (CT1*N1)<3.95, the inner diameter of the first spacing element can be balanced with the optical path of light passing through the first lens. On the one hand, it can ensure the propagation path of light between the first lens and the second lens to suppress the marginal stray light between the first lens and the second lens, while improving the assembly coaxiality, uniformly dispersing the assembly stress, avoiding lens deformation, improving the structural stability of the first lens assembly, adapting to the high-precision imaging requirements of the lens, and ensuring that the lens can focus stably and accurately in each focusing state.

[0073] For example, such as Figures 5A to 7Bis a schematic diagram showing different field-of-view defocus curves of different optical imaging lenses at the far shooting position and the near shooting position; wherein the diffraction limit is the curve of the diffraction limit in a theoretical state, and Field of View 1, Field of View 2, Field of View 3 and Field of View 4 respectively represent modulation curves formed by light rays under 0.3F field of view (i.e., 0.3 times the full field of view), 0.6F field of view (i.e., 0.6 times the full field of view), 0.8F field of view (i.e., 0.8 times the full field of view) and 1.0F field of view (i.e., the full field of view). Optionally, the modulation curves of Field of View 1 to Field of View 4 may be meridional modulation curves. When the optical imaging lens satisfies 1234 / f567=-0.93 and (CT1+CT2) / T12=4.25, and d1s / (CT1*N1)=4.17 is set, which exceeds the upper limit of the range of the conditional expression 3.60<d1s / (CT1*N1)<3.95, the inner diameter of the object side of the first spacer element is too large, and the radial fitting gap between it and the first lens is too large to effectively limit the radial displacement of the lens element, resulting in a decrease in the coaxiality of lens assembly, and stray light is easily introduced, which reduces the imaging contrast; as Figures 5A to 5B shown, the MTF curves are shifted to the right as a whole, the curves are discrete and the peaks are lowered; when d1s / (CT1*N1)=3.42 is set, which is lower than the lower limit of the range of the conditional expression 3.60<d1s / (CT1*N1)<3.95, the inner diameter of the object side of the first spacer element is too small, which easily leads to insufficient radial positioning when fitted with the first lens, the lens element is prone to eccentricity and tilt, and assembly stress tends to concentrate at the same time, causing deformation of the lens element and damaging the precision of the optical surface profile; as Figures 7A to 7B , the MTF curves are shifted to the left, and the central field of view is offset; when d1s / (CT1*N1)=3.65 is set, which falls within the range of the conditional expression 3.60<d1s / (CT1*N1)<3.95, as Figure 6A to Figure 6D shown, the inner diameter of the object side of the first spacer element is moderate, and when fitted with the first lens, good assembly coaxiality is achieved, and the MTF curves are concentrated with high peaks.

[0074] In some embodiments of the present invention, the inner diameter of the object side end face of the first lens barrel is larger than the outer diameter of the first lens; the optical imaging lens satisfies: 0.15<(d10s-d1s) / f1<0.25; wherein d10s is the inner diameter of the object side end face of the first lens barrel, d1s is the inner diameter of the object side of the first spacer element, and f1 is the effective focal length of the first lens.

[0075] By setting the inner diameter of the object-side end face of the first lens barrel to be larger than the outer diameter of the first lens, and controlling the optically formed lens to satisfy the above conditional expressions, the assembly gap between the first lens and the first lens barrel can be reasonably controlled on the premise of ensuring that the first lens is smoothly loaded into the lens barrel, which not only avoids assembly jamming and damage to the lens surface caused by too small a gap, but also prevents eccentricity or shaking of the lens caused by too large a gap, making the gap match the scale of the optical system, which is beneficial to controlling the position of the entrance pupil, suppressing off-axis stray light, and improving imaging contrast and edge image quality uniformity.

[0076] In some embodiments of the present invention, the optical imaging lens satisfies: 9.70≤f1 / EP101<11.40; where EP101 is the separation distance along the optical axis direction from the object-side end face of the first lens barrel to the object side surface of the first spacer element, and f1 is the effective focal length of the first lens.

[0077] By controlling the optical imaging lens to satisfy the above relational expression, the effective focal length of the first lens can be reasonably matched with the reserved space of the front-end lens barrel, so as to ensure the collaborative optimization of the front-end structural strength and optical performance. It not only avoids the excessively large distance from the object side surface of the first lens barrel to the first spacer element, which leads to insufficient rigidity of the front-end structure, weak impact resistance, and easy displacement of the lens; at the same time, it avoids that an excessively long front-end space is prone to introduce stray light and affect the imaging contrast. It can also avoid that the distance from the object side surface of the first lens barrel to the first spacer element is too small, the front-end structure is too tight, the first lens is easily squeezed during assembly, which causes lens deformation, damages the surface shape accuracy, and affects the stability of optical power.

[0078] In some embodiments of the present invention, the plurality of spacer elements further includes: the optical imaging lens satisfies: 0.65<EP101 / EP205<1.05; where EP101 is the separation distance along the optical axis direction from the object side surface of the first lens barrel to the object side surface of the first spacer element, and EP205 is the separation distance along the optical axis direction from the object side surface of the second lens barrel to the object side surface of the fifth spacer element.

[0079] By controlling the optical imaging lens to satisfy the above relational expression, the internal axial space layout of the first and second lens barrels can be balanced, and the reasonable optimization of the assembly stability of the two lens groups can be realized, which not only avoids the assembly coaxiality deviation caused by uneven stress on the front and rear group structures, which affects the consistency of the optical axis; but also avoids the focus drift that easily occurs during the focusing process, which affects the focusing stability. At the same time, the internal space proportions of the first and second lens barrels are balanced, and the assembly stress is uniform, which can effectively improve the coaxiality and focusing stability of the two lens groups, reduce the structural deformation caused by temperature difference and vibration, and ensure the imaging consistency under all object distances.

[0080] In some embodiments of the present invention, in the lens group, the fourth lens has the largest center thickness; the optical imaging lens satisfies: -13.85<d3m / (R7+R8)<-6.45; where d3m is the inner diameter of the image side surface of the third spacer element, 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.

[0081] By arranging the fourth lens as the thickest lens in the system, and controlling the ratio of the inner diameter of the image side surface of the third spacer element in the optical molded lens to the radius of curvature of the fourth lens to satisfy the above conditional expression, through the joint constraint of the inner diameter of the third spacer element and the double curvature of the fourth lens, the fourth lens can be ensured to be precisely centered and reliably limited in the first lens barrel, assembly eccentricity is reduced, which is beneficial to stabilizing the optical power distribution of the optical imaging lens, correcting high-order spherical aberration and chromatic aberration, and improving the consistency of focusing imaging throughout the entire process from infinity to macro distance.

[0082] In some embodiments of the present invention, the optical imaging lens satisfies: 0.25<(d10m-d3m) / f4<0.45; where d3m is the inner diameter of the image side surface of the third spacer element, d10m is the inner diameter of the image side surface of the first lens barrel, and f4 is the effective focal length of the fourth lens.

[0083] By defining the ratio of the difference between the inner diameter of the image side end surface of the first lens barrel and the inner diameter of the image side surface of the third spacer element to the focal length of the fourth lens, a stable step positioning is formed by the inner diameter difference between the image side end surface of the first lens barrel and the image side surface of the third spacer element, which reduces the radial play of the fourth lens, and at the same time is beneficial to suppressing stray light at the edges of both the object side and the image side of the fourth lens.

[0084] In some embodiments of the present invention, the optical imaging lens satisfies: -0.20<(d20s-d5s) / f5≤-0.10; where d20s is the inner diameter of the object side end surface of the second lens barrel, d5s is the inner diameter of the image side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

[0085] By controlling the ratio of the difference between the inner diameter of the object side surface of the second lens barrel and the inner diameter of the image side surface of the fifth spacer element to the focal length of the fifth lens, the propagation path of light in the fifth lens can be controlled, and the generation of stray light at the edge of the image side surface of the fifth lens can be reduced.

[0086] In some embodiments of the present invention, the optical imaging lens satisfies: 0.90≤(EP205+EP56) / Tr9r12<1.10; where EP205 is the separation distance along the optical axis direction from the object side surface of the second lens barrel to the object side surface of the fifth spacer element, and Tr9r12 is the separation distance along the optical axis direction from the object side surface of the fifth lens to the image side surface of the sixth lens.

[0087] By controlling the ratio of the distance from the second lens barrel to the fifth spacing element to the axial length from the object side of the fifth lens to the image side of the sixth lens within a range close to 1, the internal structure of the second lens barrel can be compactly matched with the axial layout of the lens group, so that the support position is reasonable, local stress concentration or space waste is avoided, the total length of the lens can be further reduced to realize a miniaturized design; at the same time, it is beneficial to improve the motion stability and coaxiality when the focusing group moves, reduce the optical axis offset during the focusing stroke, and ensure stable MTF throughout the full focusing process.

[0088] In some embodiments of the present invention, the optical imaging lens satisfies: 0.75<(D6s-d6s) / DT62<1.10; where d6s is the inner diameter of the object side of the sixth spacing element, D6s is the outer diameter of the object side of the sixth spacing element, and DT62 is the maximum effective radius of the image side of the sixth lens.

[0089] By defining the ratio of the difference between the inner and outer diameters of the sixth spacing element to the effective diameter of the image side of the sixth lens, the support width and structural strength of the sixth spacing element can be optimized on the premise of ensuring that the effective clear aperture of the sixth lens is not blocked, avoiding the situation that the sixth spacing element is too narrow to be easily broken or too wide to block the effective light beam, while reducing the risk of tilt and eccentricity of the sixth lens, which is beneficial to stably correcting chromatic aberration, spherical aberration and astigmatism, and improving the imaging quality under a large field of view and a large relative aperture.

[0090] In some embodiments of the present invention, the plurality of spacing elements further comprises a sixth auxiliary spacing element, which is disposed between the sixth spacing element and the seventh lens and is in contact with the image side of the sixth spacing element; the optical imaging lens satisfies: 0.35<CP6b / T67<0.85; where CP6b is the central thickness of the sixth auxiliary spacing element, and T67 is the air interval on the optical axis from the image side of the sixth lens to the object side of the seventh lens.

[0091] By arranging the sixth auxiliary spacing element and controlling the ratio of the total thickness of the sixth spacing element and the sixth auxiliary spacing element to the air interval between the sixth and seventh lenses, multi-point stable support and uniform limit can be formed for the sixth and seventh lenses, effectively reducing tilt, eccentricity and stress deformation during lens assembly, and enhancing the reliability and durability of the lens in high and low temperature and vibration environments.

[0092] The optical imaging lens according to the above embodiments of the present invention may adopt a plurality of lenses, for example, seven lenses as mentioned above. By reasonably distributing the optical power and surface shape of each lens and the arrangement of each spacing element, the span of each position where the lens cooperates with the lens barrel is relatively uniform, the light converging ability is enhanced, and the imaging quality of the optical imaging lens is improved.

[0093] In some embodiments of the present invention, the lens material in the optical imaging lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. When the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical imaging lens. The optical imaging lens provided by the present invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0094] In some embodiments of the present invention, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of optical imaging lenses, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens of the present invention can all be aspherical lenses, which can effectively reduce the aberrations of optical imaging lenses, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0095] When an aspherical lens is used, the shapes of the aspherical surfaces of the optical imaging lens satisfy the following equations:

[0096]

[0097] In the above formula, The height perpendicular to the optical axis is along the optical axis. The axial distance from the vertex to the surface at the location; Let c represent the paraxial curvature of an aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R). The conic coefficient; , , , , , , ... represent aspherical coefficients of order 4, 6, 8, 10, 12, 14, and 16 respectively.

[0098] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical imaging lens differ; specific differences can be found in the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. Furthermore, it should be noted that in Embodiment 1, there are three examples: optical imaging lens 1001, optical imaging lens 1002, and optical imaging lens 1003; in Embodiment 2, there are three examples: optical imaging lens 2001, optical imaging lens 2002, and optical imaging lens 2003; and in Embodiment 3, there are three examples: optical imaging lens 3001, optical imaging lens 2002, and optical imaging lens 2003. The optical imaging lenses in different examples have different structures, but the optical parameters of the optical imaging lenses in the three examples in the same embodiment are the same, that is, the curvature radius, center thickness and other parameters of the first lens to the seventh lens, as well as the spacing distance between the lenses and the higher-order term coefficients are the same.

[0099] It should be noted that "telephoto" refers to shooting the subject at infinity, while "close-up" refers to shooting the subject at macro distances (such as 309mm or 300mm). The telephoto position refers to the lens group's position when shooting from a distance, and the close-up position refers to the lens group's position when shooting close up.

[0100] Example 1

[0101] The following is for reference Figures 2A to 2-2.3 The optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of the present invention are described. Figure 2A , Figure 2B and Figure 2C The following are schematic diagrams of the optical imaging lens 1001, optical imaging lens 1002 and optical imaging lens 1003 according to Embodiment 1 of the present invention in the remote shooting position. Figure 2D , Figure 2E and Figure 2F The diagrams show the structures of optical imaging lenses 1001, 1002, and 1003 in close-up positions according to Embodiment 1 of the present invention.

[0102] like Figures 2A to 2F As shown, the structural schematic diagrams of optical imaging lenses 1001, 1002 and 1003 all include a first lens barrel P10, a second lens barrel P20, imaging lens groups E1 to E7 and multiple spacer elements P1 to P6.

[0103] In Embodiment 1, the schematic diagrams of optical imaging lenses 1001 and 1002 show the same imaging lens group. The imaging lens group, from the object side to the image side, sequentially includes: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, and a seventh lens E7 with negative optical power. The object side of the first lens E1... The object-side surface S1 of the second lens E2 is convex, and its image-side surface S2 is concave. The object-side surface S3 of the third lens E3 is convex, and its image-side surface S4 is concave. The object-side surface S5 of the third lens E3 is convex, and its image-side surface S6 is concave. The object-side surface S7 and image-side surface S8 of the fourth lens E4 are both convex. The object-side surface S9 and image-side surface S10 of the fifth lens E5 are both concave. The object-side surface S11 of the sixth lens E6 is convex, and its image-side surface S12 is concave. The object-side surface S13 of the seventh lens E7 is convex, and its image-side surface S14 is concave. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S17. Surfaces S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S17 (not shown in the figure) is the imaging surface, and OBJ (not shown in the figure) is the object surface.

[0104] Tables 1-1 and 1-2 list the relevant parameters of each lens of the optical imaging lens in this embodiment at the telephoto and close-up positions, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0105]

[0106] Table 1-1

[0107]

[0108] Table 1-2

[0109] Table 1-3 lists the aspherical coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0110]

[0111] Table 1-3

[0112] like Figures 2A to 2F As shown, optical imaging lenses 1001, 1002, and 1003 each include five spacer elements and two auxiliary spacer elements. The five spacer elements are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fifth spacer element P5, and a sixth spacer element P6. The two auxiliary spacer elements are a second auxiliary spacer element P2b and a sixth auxiliary spacer element P6b. The second auxiliary spacer element P2b is disposed on the image side of the second spacer element P2 and contacts the image side surface of the second spacer element P2, and the sixth auxiliary spacer element P6b is disposed on the image side of the sixth spacer element P6 and contacts the image side surface of the sixth spacer element P6.

[0113] The differences between optical imaging lenses 1001, 1002, and 1003 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 1001, 1002, and 1003 in Embodiment 1.

[0114] Figure 2-1.1 and Figure 2-2.1 The on-axis chromatic aberration curves of the optical imaging lens of Embodiment 1 are shown at the telephoto and close-up positions, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 2-1.2 and Figure 2-2.2 The astigmatism curves of the optical imaging lens of Embodiment 1 are shown at the far-shooting position and the near-shooting position, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 2-1.3 and Figure 2-2.3 The distortion curves of the optical imaging lens of Embodiment 1 are shown at the telephoto and close-up positions, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 2-1.1 to 2-2.3 As can be seen, the optical imaging lens given in Example 1 can achieve good imaging quality.

[0115] Example 2

[0116] The following is for reference Figures 3A to 3-2.3 The optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of the present invention are described. Figure 3A , Figure 3B and Figure 3C The following are schematic diagrams of the optical imaging lens 2001, optical imaging lens 2002 and optical imaging lens 2003 according to Embodiment 2 of the present invention in the remote shooting position. Figure 3D , Figure 3E and Figure 3F The diagrams show the structures of optical imaging lenses 2001, 2002, and 2003 in close-up positions according to Embodiment 2 of the present invention.

[0117] like Figures 3A to 3F As shown, the structural schematic diagrams of optical imaging lenses 2001, 2002 and 2003 all include a first lens barrel P10, a second lens barrel P20, imaging lens groups E1 to E7 and multiple spacer elements P1 to P6.

[0118] In Embodiment 2, the schematic diagrams of optical imaging lenses 2001 and 2002 show the same imaging lens group. The imaging lens group, from the object side to the image side, sequentially includes: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, and a seventh lens E7 with negative optical power. The first lens E1... The object-side surface S1 is convex, and its image-side surface S2 is concave; the object-side surface S3 of the second lens E2 is convex, and its image-side surface S4 is concave; the object-side surface S5 and image-side surface S6 of the third lens E3 are both concave; the object-side surface S7 and image-side surface S8 of the fourth lens E4 are both convex; the object-side surface S9 of the fifth lens E5 is convex, and its image-side surface S10 is concave; the object-side surface S11 and image-side surface S12 of the sixth lens E6 are both convex; and the object-side surface S13 of the seventh lens E7 is convex, and its image-side surface S14 is concave. Light from the object passes sequentially through each surface S1 to S14 and is finally imaged on the imaging surface S17. Surfaces S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S17 (not shown in the figure) is the imaging surface, and OBJ (not shown in the figure) is the object surface.

[0119] Tables 2-1 and 2-2 list the relevant parameters of each lens of the optical imaging lens in this embodiment at the telephoto and close-up positions, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0120]

[0121] Table 2-1

[0122]

[0123] Table 2-2

[0124] Table 2-3 lists the aspherical coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0125]

[0126] Table 2-3

[0127] like Figures 3A to 3F As shown, optical imaging lenses 2001, 2002, and 2003 each include five spacer elements and three auxiliary spacer elements. The five spacer elements are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fifth spacer element P5, and a sixth spacer element P6. The three auxiliary spacer elements are a first auxiliary spacer element P1b, a third auxiliary spacer element P3b, and a sixth auxiliary spacer element P6b. The first auxiliary spacer element P1b is disposed on the image side of the first spacer element P1 and contacts the image side of the first spacer element P1; the third auxiliary spacer element P3b is disposed on the image side of the third spacer element P3 and contacts the image side of the third spacer element P3; and the sixth auxiliary spacer element P6b is disposed on the image side of the sixth spacer element P6 and contacts the image side of the sixth spacer element P6.

[0128] The differences between optical imaging lenses 2001, 2002, and 2003 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 2001, 2002, and 2003 in Embodiment 2.

[0129] Figure 3-1.1 and Figure 3-2.1 The on-axis chromatic aberration curves of the optical imaging lens of Embodiment 2 are shown at the far-field and near-field positions, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3-1.2 and Figure 3-2.2 The astigmatism curves of the optical imaging lens of Embodiment 2 are shown at the far-viewing position and the near-viewing position, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3-1.3 and Figure 3-2.3The distortion curves of the optical imaging lens of Embodiment 2 are shown at the telephoto and close-up positions, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 3-1.1 to 3-2.3 It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0130] Example 3

[0131] The following is for reference Figures 4A to 4-2.3 The optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of the present invention are described. Figure 4A , Figure 4B and Figure 4C The following are schematic diagrams of the optical imaging lens 3001, optical imaging lens 3002 and optical imaging lens 3003 according to Embodiment 3 of the present invention in the remote shooting position. Figure 4D , Figure 4E and Figure 4F The diagrams show the structures of optical imaging lenses 3001, 3002, and 3003 in close-up positions according to Embodiment 3 of the present invention.

[0132] like Figures 4A to 4F As shown, the structural schematic diagrams of optical imaging lenses 3001, 3002 and 3003 all include a first lens barrel P10, a second lens barrel P20, imaging lens groups E1 to E7 and multiple spacer elements P1 to P6.

[0133] In Embodiment 3, the structural schematic diagrams of optical imaging lenses 3001 and 3002 employ the same imaging lens group. The imaging lens group, from the object side to the image side, sequentially includes: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, and a seventh lens E7 with negative optical power. The object side of the first lens E1... Lens S1 is a convex surface, and its image-side surface S2 is a concave surface; the object-side surface S3 of the second lens E2 is a convex surface, and its image-side surface S4 is a concave surface; the object-side surface S5 of the third lens E3 is a convex surface, and its image-side surface S6 is a concave surface; the object-side surface S7 and image-side surface S8 of the fourth lens E4 are both convex surfaces; the object-side surface S9 of the fifth lens E5 is a convex surface, and its image-side surface S10 is a concave surface; the object-side surface S11 of the sixth lens E6 is a convex surface, and its image-side surface S12 is a concave surface; the object-side surface S13 of the seventh lens E7 is a convex surface, and its image-side surface S14 is a concave surface. Light from the object passes sequentially through each surface S1 to S14 and is finally imaged on the imaging surface S17. Surfaces S15 and S16 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S17 (not shown in the figure) is the imaging surface, and OBJ (not shown in the figure) is the object surface.

[0134] Tables 3-1 and 3-2 list the relevant parameters of each lens of the optical imaging lens in this embodiment at the telephoto and close-up positions, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient, wherein the units of radius of curvature and thickness are millimeters (mm).

[0135]

[0136] Table 3-1

[0137]

[0138] Table 3-2

[0139] Table 3-3 lists the aspherical coefficients of each aspherical lens in the optical imaging lens of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 A 30 .

[0140]

[0141] Table 3-3

[0142] like Figures 4A to 4F As shown, optical imaging lenses 3001, 3002, and 3003 each include five spacer elements and two auxiliary spacer elements. The five spacer elements are a first spacer element P1, a second spacer element P2, a third spacer element P3, a fifth spacer element P5, and a sixth spacer element P6. The two auxiliary spacer elements are a first auxiliary spacer element P1b and a sixth auxiliary spacer element P6b. The first auxiliary spacer element P1b is disposed on the image side of the first spacer element P1 and contacts the image side of the first spacer element P1, and the sixth auxiliary spacer element P6b is disposed on the image side of the sixth spacer element P6 and contacts the image side of the sixth spacer element P6.

[0143] The differences between optical imaging lenses 3001, 3002, and 3003 may lie in the size of the spacer element, the non-effective diameter area of ​​the lens, and the lens barrel structural parameters. Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lenses 3001, 3002, and 3003 in Embodiment 3.

[0144] Figure 4-1.1 and Figure 4-2.1 The on-axis chromatic aberration curves of the optical imaging lens of Embodiment 3 are shown at the telephoto and close-up positions, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 4-1.2 and Figure 4-2.2 The astigmatism curves of the optical imaging lens of Embodiment 3 are shown at the far-viewing position and the near-viewing position, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4-1.3 and Figure 4-2.3 The distortion curves of the optical imaging lens of Embodiment 3 are shown at the telephoto and close-up positions, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figures 4-1.1 to 4-2.3 It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0145] In summary, the optical parameters of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Embodiments 1 to 3 are shown in Table 4 below.

[0146]

[0147] Table 4

[0148] The basic parameters of the spacer elements and lens barrels of the optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Examples 1 to 3 are shown in Table 5 below, where the unit of each parameter is millimeters (mm).

[0149]

[0150] Table 5

[0151] The optical imaging lenses 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002 and 3003 of Examples 1 to 3 satisfy the relationship shown in Table 6.

[0152]

[0153] Table 6

[0154] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. An optical imaging lens, comprising a first lens barrel, a second lens barrel, a lens group, and a plurality of spacer elements, wherein the first lens barrel and the second lens barrel are used to accommodate the lens group and the plurality of spacer elements; characterized in that, The lens group consists of a first lens with positive optical power, a second lens with negative optical power, a third lens, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power, totaling seven lenses with optical power. The first lens has a convex object-side surface and a concave image-side surface; the second lens has a convex object-side surface and a concave image-side surface; the third lens has a concave image-side surface; the fourth lens has a convex object-side surface and a convex image-side surface; the fifth lens has a convex object-side surface and a concave image-side surface; the sixth lens has a convex object-side surface; and the seventh lens has a convex object-side surface and a concave image-side surface. The first lens, the second lens, the third lens, and the fourth lens are housed within the first lens barrel, and the fifth lens, the sixth lens, and the seventh lens are housed within the second lens barrel; When the object distance of the optical imaging lens changes from infinity to micro, the first lens barrel and the second lens barrel are relatively displaced, and the air gap between the image side of the fourth lens and the object side of the fifth lens on the optical axis increases. The plurality of spacers includes: a first spacer, which is placed between the first lens and the second lens and contacts the image side of the first lens; The optical imaging lens satisfies: -1.05≤f1234 / f567≤-0.90, 2.00<(CT1+CT2) / T12<5.15; 3.60 <d1s / (CT1*N1)<3.95; Wherein, f1234 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, f567 is the combined focal length of the fifth lens, the sixth lens and the seventh lens, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, T12 is the spacing between the first lens and the second lens along the optical axis, d1s is the inner diameter of the object side of the first spacer element, and N1 is the refractive index of the first lens.

2. The optical imaging lens according to claim 1, characterized in that, The plurality of spacer elements also include: The second spacer element is placed between the second lens and the third lens and is in contact with the image side of the second lens; The third spacer element is placed between the third lens and the fourth lens and is in contact with the image side of the third lens; The fifth spacer element is placed between the fifth lens and the sixth lens and is in contact with the image side of the fifth lens; A sixth spacer element is placed between the sixth lens and the seventh lens and is in contact with the image side of the sixth lens; The maximum outer diameter of the first to the third spacer elements decreases in a step-like manner, while the maximum outer diameter of the fifth to the sixth spacer elements increases in a step-like manner.

3. The optical imaging lens according to claim 2, characterized in that, The inner diameter of the object-side end face of the first lens barrel is larger than the outer diameter of the first lens; The optical imaging lens satisfies: 0.15 < (d10s - d1s) / f1 < 0.25; Wherein, d10s is the inner diameter of the object-side end face of the first lens barrel, d1s is the inner diameter of the object-side side face of the first spacer element, and f1 is the effective focal length of the first lens.

4. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 9.70≤f1 / EP101<11.40; Wherein, EP101 is the distance along the optical axis from the object-side end face of the first lens barrel to the object-side surface of the first spacer element, and f1 is the effective focal length of the first lens.

5. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 0.65 <EP101 / EP205<1.05; Wherein, EP101 is the distance along the optical axis between the object side of the first lens barrel and the object side of the first spacer element, and EP205 is the distance along the optical axis between the object side of the second lens barrel and the object side of the fifth spacer element.

6. The optical imaging lens according to claim 2, characterized in that, In the lens group, the fourth lens has the largest center thickness; The optical imaging lens satisfies: -13.85 <d3m / (R7+R8)<-6.45; Wherein, d3m is the inner diameter of the image side of the third spacer element, R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

7. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 0.25 < (d10m - d3m) / f4 < 0.45; Wherein, d3m is the inner diameter of the image-side surface of the third spacer element, d10m is the inner diameter of the image-side end face of the first lens barrel, and f4 is the effective focal length of the fourth lens.

8. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: -0.20 < (d20s - d5s) / f5 ≤ -0.10; Wherein, d20s is the inner diameter of the object-side end face of the second lens barrel, d5s is the inner diameter of the image-side face of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

9. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 0.90≤(EP205+EP56) / Tr9r12<1.10; Wherein, EP205 is the distance between the object side of the second lens barrel and the object side of the fifth spacer element along the optical axis, and Tr9r12 is the distance between the object side of the fifth lens and the image side of the sixth lens along the optical axis.

10. The optical imaging lens according to claim 2, characterized in that, The optical imaging lens satisfies: 0.75 < (D6s - d6s) / DT62 < 1.10; Wherein, d6s is the inner diameter of the object side of the sixth spacer element, D6s is the outer diameter of the object side of the sixth spacer element, and DT62 is the maximum effective radius of the image side of the sixth lens.

11. The optical imaging lens according to claim 2, characterized in that, The plurality of spacers further includes: a sixth auxiliary spacer, disposed between the sixth spacer and the seventh lens and in contact with the image side of the sixth spacer; The optical imaging lens satisfies: 0.35 <CP6b / T67<0.85; Wherein, CP6b is the center thickness of the sixth auxiliary spacer element, and T67 is the air gap on the optical axis between the image side of the sixth lens and the object side of the seventh lens.

Images