Optical imaging lens
By introducing spacer elements into a six-piece optical imaging lens and controlling their size and curvature, the problem of ghost images and MTF performance risks in large viewing angles and small head lenses is solved, and high-quality imaging effects are achieved.
Patent Information
- Application Number
- CN202510134095.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2025-03-18
AI Technical Summary
While pursuing a large perspective and a small head, existing six-piece optical imaging lenses are difficult to balance the performance risks of ghost images and MTFs, resulting in poor imaging quality.
An optical imaging lens is designed to meet a specific range of curvature ratios and interval sizes by introducing spacer elements into the lens group and controlling the radius and inner diameter dimensions of the lens and spacer elements to reduce ghost images and improve MTF performance.
It effectively eliminates the circular ghost image, improves imaging stability and clarity, meets the needs of large viewing angles and small heads, and controls the mechanical size of the lens.
Smart Images
Figure CN119644561A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical elements, and specifically, to an optical imaging lens. Background Art
[0002] With the rapid development of technology, consumer electronic devices such as mobile phones and tablet computers are undergoing rapid updates and iterations. This trend has prompted the market to continuously raise requirements for optical lenses, specifically including: pursuing higher pixels, larger image planes, wider viewing angles, and larger apertures. At the same time, in order to increase the screen-to-body ratio of the device, the market's requirements for the mechanical size of the lens are also becoming increasingly stringent, expecting the lens to have a smaller volume while maintaining high performance.
[0003] However, the requirements such as large viewing angle, high resolution, small mechanical size, good aberration control, excellent ghosting suppression effect, and good processing performance are mutually contradictory and difficult to balance. Specifically, in the current six-piece optical imaging lens, several important indicators such as large viewing angle, weak ghosting, and small head will restrict each other, and the superposition of the two indicators of large viewing angle and small head will increase the risk of ghosting and MTF (modulation transfer function) performance.
[0004] Therefore, designing a six-piece optical lens that can minimize the risk of ghosting and MTF performance while achieving a large viewing angle and meeting the small head index is of great significance for meeting the comprehensive performance requirements of the market for optical lenses. Summary of the Invention
[0005] In a first aspect of this application, there is provided such an optical imaging lens, which includes: a lens barrel, and a lens group and a spacer element group disposed in the lens barrel. Among them, the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis from the object side to the image side. The spacer element group includes: a first spacer element and a second spacer element, where the first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The number of lenses with optical power in the optical imaging lens is six. The object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is convex; the optical imaging lens satisfies: 0.80 < R2 / R1 < 2.95 and 0.75 < R1 / R3 × (d1s / d2s) < 4.05; where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, d1s is the maximum inner diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis.
[0006] In one embodiment, the optical imaging lens satisfies: 1.10 < (f2 / R3)×(D2s / d2m) < 1.80, where f2 is the effective focal length of the second lens, R3 is the radius of curvature of the object side surface of the second lens, D2s is the maximum outer diameter of the object side surface of the second spacer element in a direction perpendicular to the optical axis, and d2m is the maximum inner diameter of the image side surface of the second spacer element in a direction perpendicular to the optical axis.
[0007] In one embodiment, the optical imaging lens satisfies: 1.70 < EP01 / CT1 < 2.45, where EP01 is the distance from the object side end face of the lens barrel to the object side surface of the first spacer element along the optical axis, and CT1 is the central thickness of the first lens on the optical axis.
[0008] In one embodiment, the optical imaging lens satisfies: 1.40 < f12 / d2m < 1.90, where f12 is the combined focal length of the first lens and the second lens, and d2m is the maximum inner diameter of the image side surface of the second spacer element in a direction perpendicular to the optical axis.
[0009] In one embodiment, the optical imaging lens satisfies: 2.90 < f45 / DT41 < 4.25, where f45 is the combined focal length of the fourth lens and the fifth lens, and DT41 is the maximum effective radius of the object side surface of the fourth lens.
[0010] In one embodiment, the spacer element group further includes: a third spacer element and a fourth spacer element, where the third spacer element is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and is at least partially in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 1.20 < CT4 / EP34 < 2.60, where CT4 is the central thickness of the fourth lens on the optical axis, and EP34 is the distance between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis.
[0011] In one embodiment, the spacer element group further includes: a third spacer element, where the third spacer element is disposed on the image side of the third lens and is at least partially in contact with the image side surface of the third lens; the optical imaging lens satisfies: -2.40 < R7 / d3m < -0.90, where R7 is the radius of curvature of the object side surface of the fourth lens, and d3m is the maximum inner diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis.
[0012] In one embodiment, the spacer element group further includes: a third spacer element and a fourth spacer element, wherein the third spacer element is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens, and the fourth spacer element is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; the optical imaging lens satisfies: 0.35<(CP3+CP4) / (CT3+CT4)<0.60, wherein CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, CT3 is the center thickness of the third lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis.
[0013] In one embodiment, the spacer element group includes: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens, and the fifth spacer element is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens; the optical imaging lens satisfies: -0.90<(d5s-d4s) / (f5-f6)<2.05, wherein d4s is the maximum inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d5s is the maximum inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.
[0014] In one embodiment, the spacer element group further includes: a fifth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens; the optical imaging lens satisfies: 0.55<(D5m-d5m) / (2×DT42)<0.85, wherein D5m is the maximum outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and DT42 is the maximum effective radius of the image side surface of the fourth lens.
[0015] In one embodiment, the spacer element group also includes: a third spacer element, wherein the third spacer element is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the optical imaging lens satisfies: 1.35<(D3s-d3s) / T34<11.00, wherein D3s is the maximum outer diameter of the object side surface of the third spacer element in a direction perpendicular to the optical axis, d3s is the maximum inner diameter of the object side surface of the third spacer element in a direction perpendicular to the optical axis, and T34 is the air spacing between the third lens and the fourth lens on the optical axis.
[0016] In one embodiment, the spacer element group further includes: a fifth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 3.70 < (d5m + D5m) / (2 × Yc52) < 6.40, where d5m is the maximum inner diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis, D5m is the maximum outer diameter of the image side surface of the fifth spacer element in the direction perpendicular to the optical axis, and Yc52 is the distance from the inflection point farthest from the optical axis among the effective diameters of the image side surface of the fifth lens to the optical axis.
[0017] In one embodiment, the spacer element group includes: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; the optical imaging lens satisfies: 0.65 < EP45 / |SAG42| < 1.00, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG42 is the axial distance between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens.
[0018] A second aspect of the present application provides such an optical imaging lens, which includes: a lens barrel and a lens group and a spacer element group disposed in the lens barrel, wherein the lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis from the object side to the image side. The spacer element group includes: a first spacer element and a second spacer element, wherein the first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The number of lenses having optical power in the optical imaging lens is six. The object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is convex. The optical imaging lens satisfies: 0.80 < R2 / R1 < 2.95 and 1.10 < (f2 / R3) × (D2s / d2m) < 1.80, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, f2 is the effective focal length of the second lens, R3 is the curvature radius of the object side surface of the second lens, D2s is the maximum outer diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and d2m is the maximum inner diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis.
[0019] The present application provides a six-piece optical imaging lens. The object side of the first lens is convex and the image side is concave, and it satisfies: 0.80 < R2 / R1 < 2.95. By controlling the difference between the curvature radii of the object side and the image side of the first lens within a moderate range, a large field of view can be ensured, while aberration can be better corrected and the lens head size can be reduced. However, when the value of R2 / R1 is small, an annular ghost image problem is likely to occur. In the present application, a first spacer element is designed on the image side of the first lens, and a second spacer element is designed on the image side of the second lens, and the optical imaging lens satisfies 0.75 < R1 / R3 × (d1s / d2s) < 4.05. By controlling the inner diameters of the object sides of the first spacer element and the second spacer element to be appropriate, non-imaging light can be intercepted as much as possible, which is beneficial to improving the circular ghost image in a small angle range, and at the same time, the MTF (modulation transfer function) performance is satisfied, and the imaging stability is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:
[0021] Figure 1 FIG. shows a structural layout diagram of an optical imaging lens and a schematic diagram of some parameters according to the present application;
[0022] Figure 2 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application;
[0023] Figure 3 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application;
[0024] Figure 4 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application;
[0025] Figure 5 FIG. shows the axial chromatic aberration curve (A1), astigmatism curve (B1), distortion curve (C1), and lateral chromatic aberration curve (D1) of the optical imaging lens according to Embodiments 1 to 3 of the present application;
[0026] Figure 6 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application;
[0027] Figure 7 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application;
[0028] Figure 8 FIG. shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application;
[0029] Fig. 9 The axial chromatic aberration curve (A2), astigmatism curve (B2), distortion curve (C2) and magnification chromatic aberration curve (D2) of the optical imaging lenses of Examples 4 to 6 of the present application are shown;
[0030] Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;
[0031] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;
[0032] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;
[0033] Fig.13 The axial chromatic aberration curve (A3), astigmatism curve (B3), distortion curve (C3) and magnification chromatic aberration curve (D3) of the optical imaging lenses of Examples 7 to 9 of the present application are shown;
[0034] Fig.14 A ghost image analysis diagram is shown when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=0.83;
[0035] Fig.15 The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=0.83 is shown;
[0036] Fig.16 A ghost image analysis diagram is shown when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=0.4;
[0037] Fig.17 The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=5.0 is shown. DETAILED DESCRIPTION
[0038] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application 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.
[0039] 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 application, the first lens discussed below may also be referred to as the second lens or the third lens.
[0040] 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.
[0041] Those skilled in the art will understand that a lens is an optical component formed by two refractive surfaces surrounding a transparent medium. The refractive surface can be a spherical surface (including a plane, i.e., a spherical surface with an infinite radius of curvature) or an aspherical surface. The line connecting the centers of curvature of the two refractive surfaces is the optical axis of the lens. In this article, the surface of the two refractive surfaces close to the object is called the object side of the lens, and the surface close to the imaging surface is called the image side of the lens.
[0042] In this article, the paraxial area refers to the area 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 area; 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 area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, judging the convexity by the positive or negative R value (R refers to the radius of curvature of the paraxial area). For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.
[0043] The solutions described in the embodiments of the present application can be simulated by software / tools such as ZEMAX and CODE V. The solutions described in some embodiments can be simulated by CODE V. In the process of simulation using the above software / tools, the surface shape of the lens can be appropriately adjusted according to the surface shape model provided by the software / tool used.
[0044] 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.
[0045] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those 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 sense unless explicitly defined in this article.
[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer elements in the embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer elements, etc. of the embodiment.
[0047] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0048] For a six-element wide-angle lens, the requirements for wide viewing angle, low ghosting, and good processability are often contradictory and difficult to balance. For example, the convex-concave surface of the first lens helps to realize the design of a wide-angle optical system. By controlling the curvature radii of the object side and image side of the first lens within a certain range, it has a positive effect on correcting the off-axis aberration of the system. However, while ensuring the wide-angle characteristics, when the R2 / R1 value is small, ring ghosting problems are likely to occur, resulting in blurred edge images.
[0049] The first aspect of the present application provides an optical imaging lens, which may include a lens group, a spacer element group, and a lens barrel. Among them, the lens group and the spacer element group are disposed in the lens barrel. The lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The object side surface of the first lens is convex, and the image side surface is concave, and satisfies: 0.80 < R2 / R1 < 2.95. By controlling the difference between the curvature radii of the object side surface and the image side surface of the first lens within a moderate range, both a large field of view can be ensured, and at the same time, aberrations can be better corrected, and the size of the lens head can be reduced. However, when the value of R2 / R1 is small, a circular ghost image problem is likely to occur.
[0050] In one embodiment, the spacer element group may include a first spacer element and a second spacer element. Among them, the first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The optical imaging lens may satisfy: 0.75 < R1 / R3 × (d1s / d2s) < 4.05, where R1 is the curvature radius of the object side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, d1s is the maximum inner diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis. When 0.75 < R1 / R3 × (d1s / d2s) < 4.05 is satisfied, by controlling the inner diameters of the object side surfaces of the first spacer element and the second spacer element, non-imaging light can be intercepted as much as possible, which is beneficial to improving the circular ghost image in a small angle range and at the same time satisfying the MTF performance. When d1s / d2s is small, that is, when d2s is relatively large, when R1 / R3 × (d1s / d2s) < 0.75, the object side surface of the second spacer element will reflect part of the stray light, thus forming a circular ghost image. And when d2s is relatively small, the MTF quality decreases, which is reflected in the imaging quality as the details will be blurred and the clarity is insufficient. Therefore, appropriate sizes of d1s and d2s need to be selected for the first spacer element and the second spacer element.
[0051] The following combines Figures 14 to 17 , and further illustrates that when the optical imaging lens of the present application satisfies 0.80 < R2 / R1 < 2.95 and 0.75 < R1 / R3 × (d1s / d2s) < 4.05, it can effectively eliminate the circular ghost image and at the same time improve the MTF performance. Exemplarily, when the optical imaging lens satisfies 0.80 < R2 / R1 < 2.95, Fig.14 shows the ghost image analysis diagram when the optical imaging lens satisfies R1 / R3 × (d1s / d2s) = 0.83, Fig.15The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 0.83 is shown. Fig.16 The ghost image analysis diagram when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 0.4 is shown. Fig.17 The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 5.0 is shown.
[0052] As Fig.14 shown, when the optical imaging lens satisfies the range of 0.75 < R1 / R3×(d1s / d2s) < 4.05 of this application, it can effectively eliminate circular ghost images, and at the same time can improve the MTF performance, and good imaging quality in each field of view can be obtained. And as Fig.16 and Fig.17 shown, when the optical imaging lens does not satisfy the range of 0.75 < R1 / R3×(d1s / d2s) < 4.05 of this application, its optical performance is poor. Specifically, Fig.16 in the optical imaging lens, R1 / R3×(d1s / d2s) < 0.75 and d1s / d2s is small, that is, when d2s has a relatively large value, the object side surface of the second spacer element will reflect part of the stray light, thus forming a circular ghost image. Fig.17 in the optical imaging lens, R1 / R3×(d1s / d2s) > 4.05 and d2s has a relatively small value, and the MTF quality decreases. Reflected in the imaging quality, the details will be blurred and the clarity is insufficient.
[0053] In one embodiment, the spacer element group may include a first spacer element and a second spacer element. Among them, the first spacer element is placed on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is placed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The optical imaging lens can satisfy: 1.10 < (f2 / R3)×(D2s / d2m) < 1.80, where f2 is the effective focal length of the second lens, R3 is the curvature radius of the object side surface of the second lens, D2s is the maximum outer diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and d2m is the maximum inner diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis. Satisfying 1.10 < (f2 / R3)×(D2s / d2m) < 1.80, by restricting the effective focal length of the second lens, the curvature radius of the object side surface, the outer diameter of the object side surface of the second spacer element, and the inner diameter of the image side surface, non-imaging light can be intercepted as much as possible, which helps to reduce the ghost image risk at small angles and improve the imaging clarity and imaging quality.
[0054] In an exemplary embodiment, the optical imaging lens may further include an aperture. The aperture may be disposed on the object side of the first lens. It should be noted that the position of the aperture disclosed herein is only an example and not a limitation; in alternative embodiments, the aperture may also be disposed at other positions according to actual needs.
[0055] In an exemplary embodiment, the spacer element group may include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element. Among them, the first spacer element is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens. The second spacer element is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens. The third spacer element is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens. The fourth spacer element is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. The fifth spacer element is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens. It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical imaging lens may also include any number of spacer elements. Reasonable use of spacer elements can effectively avoid stray light risks, reduce interference with image quality, and thereby improve the imaging quality of the optical imaging lens.
[0056] In an exemplary embodiment, the lens barrel may include an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface, wherein the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.
[0057] In an exemplary embodiment, at least one trimmed lens may be included in the lens group. The outer peripheral surface of the trimmed lens may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the lens is smaller than the outer diameter of the non-trimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the non-trimmed portion of the lens.
[0058] In an exemplary embodiment, at least one trimmed spacer element may be included in the spacer element group. The outer circumference of the trimmed spacer element may have a trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer element is smaller than the outer diameter of the non-trimmed portion of the spacer element. The outer diameter of the spacer element generally refers to the maximum outer diameter of the non-trimmed portion.
[0059] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.70 < EP01 / CT1 < 2.45, where EP01 is the distance from the object-side end face of the lens barrel to the object-side surface of the first spacer element along the optical axis, and CT1 is the central thickness of the first lens on the optical axis. Satisfying 1.70 < EP01 / CT1 < 2.45 and controlling EP01 within a suitable range can enhance the bearing thickness of the lens barrel, effectively improve the support strength of the lens barrel, and further reduce the risk of abnormal assembly of the lens and the bearing member caused by a significant difference in the outer diameters of adjacent lenses.
[0060] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.40 < f12 / d2m < 1.90, where f12 is the combined focal length of the first lens and the second lens, and d2m is the maximum inner diameter of the image-side surface of the second spacer element in a direction perpendicular to the optical axis. Satisfying 1.40 < f12 / d2m < 1.90 and constraining the combined focal length of the first lens and the second lens is beneficial for reasonably distributing the optical power of the system and obtaining a larger field of view.
[0061] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 2.90 < f45 / DT41 < 4.25, where f45 is the combined focal length of the fourth lens and the fifth lens, and DT41 is the maximum effective radius of the object-side surface of the fourth lens. Satisfying 2.90 < f45 / DT41 < 4.25 and constraining the combined focal length of the fourth lens and the fifth lens is beneficial for reasonably distributing the optical power of the system, optimizing the system aberration, and enabling the lens to have a larger imaging angle of view and higher imaging resolution.
[0062] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.20 < CT4 / EP34 < 2.60, where CT4 is the central thickness of the fourth lens on the optical axis, and EP34 is the distance between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis. Satisfying 1.20 < CT4 / EP34 < 2.60 and constraining the relationship between the central thickness and the edge thickness of the fourth lens helps the fourth lens to have good processability.
[0063] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -2.40 < R7 / d3m < -0.90, where R7 is the curvature radius of the object-side surface of the fourth lens, and d3m is the maximum inner diameter of the image-side surface of the third spacer element in a direction perpendicular to the optical axis. Satisfying -2.40 < R7 / d3m < -0.90 and limiting the inner diameter of the image-side surface of the third spacer element within a reasonable range is beneficial for controlling the light-passing aperture of the fourth lens and reducing the size of the lens.
[0064] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.35<(CP3+CP4) / (CT3+CT4)<0.60, wherein CP3 is the maximum thickness of the third spacing element along the optical axis, CP4 is the maximum thickness of the fourth spacing element along the optical axis, CT3 is the center thickness of the third lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis. Satisfying 0.35<(CP3+CP4) / (CT3+CT4)<0.60, by controlling the maximum thickness of the third spacing element and the fourth spacing element along the optical axis within a reasonable range, the gap between the third lens and the fourth lens, and between the fourth lens and the fifth lens can be controlled, thereby reducing the risk of falling and scratching between the lenses.
[0065] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: -0.90<(d5s-d4s) / (f5-f6)<2.05, wherein d4s is the maximum inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d5s is the maximum inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens. Satisfying -0.90<(d5s-d4s) / (f5-f6)<2.05 can effectively control the light aperture of the fifth lens and the sixth lens, and reduce the rear end size of the lens barrel.
[0066] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.55<(D5m-d5m) / (2×DT42)<0.85, wherein D5m is the maximum outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and DT42 is the maximum effective radius of the image side surface of the fourth lens. Satisfying 0.55<(D5m-d5m) / (2×DT42)<0.85 is conducive to controlling the light aperture of the fourth lens and the fifth lens and reducing the rear end size of the lens barrel.
[0067] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 1.35<(D3s-d3s) / T34<11.00, wherein D3s is the maximum outer diameter of the object side surface of the third spacing element in a direction perpendicular to the optical axis, d3s is the maximum inner diameter of the object side surface of the third spacing element in a direction perpendicular to the optical axis, and T34 is the air spacing between the third lens and the fourth lens on the optical axis. Satisfying 1.35<(D3s-d3s) / T34<11.00 can effectively control the aperture of the third lens.
[0068] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 3.70 < (d5m + D5m) / (2 × Yc52) < 6.40, where d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, D5m is the maximum outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and Yc52 is the distance from the inflection point farthest from the optical axis in the effective diameter of the image side surface of the fifth lens to the optical axis. Satisfying 3.70 < (d5m + D5m) / (2 × Yc52) < 6.40 is beneficial to controlling the light passing aperture and shape of the fifth lens, reducing the size of the rear end of the lens barrel and the chief ray angle of the lens, and ensuring the connection of the front and rear imaging systems.
[0069] In an exemplary embodiment, the optical imaging lens according to the present application may satisfy: 0.65 < EP45 / |SAG42| < 1.00, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG42 is the axial distance between the intersection of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens. Satisfying 0.65 < EP45 / |SAG42| < 1.00 is beneficial to controlling the shape of the fourth lens and improving the processing performance of the fourth lens.
[0070] In an embodiment of the present application, at least one of the lens surfaces of each lens is an aspherical surface, that is, at least one of the object side surface of the first lens to the image side surface of the sixth lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much aberration as possible during imaging, thereby improving the imaging quality. Optionally, the object side surfaces and image side surfaces of all the lenses from the first lens to the sixth lens are aspherical surfaces.
[0071] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.
[0072] It should be understood that the present application is concerned with the performance optimization of the six-piece wide-angle lens. Specifically, the present application is concerned with how to overcome problems such as the small R2 / R1 value that easily produces annular ghost images, or problems such as abnormal assembly of lenses and supporting parts caused by significant differences in the outer diameters of adjacent lenses, or problems such as lens machinability. The specific focal length distribution of the six lenses and the surface configuration of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. In other words, although several specific focal length distributions and surface configurations are shown for the imaging lens group in the embodiments of the present application, it should be understood that these embodiments are merely exemplary, and the imaging lens group in the present application should not be limited to the several specific situations shown in the embodiments.
[0073] The optical imaging lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the six lenses mentioned above. 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 lens may be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.
[0074] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.
[0075] Example 1
[0076] Figure 2 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application. Figure 2 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The optical imaging lens further comprises a stop STO (not shown) disposed on the object side of the first lens E1. Light from the object sequentially passes through each surface S1 to S12 and is finally imaged on an imaging surface (not shown).
[0077] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, wherein the units of the curvature radius, thickness / distance and effective focal length are all millimeters (mm).
[0078] Table 1
[0079]
[0080] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the sixth lens E6 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:
[0081]
[0082] 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 (that is, the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the conic coefficient;
[0083] Ai is the correction coefficient of the i-th order aspheric surface. Table 2 shows the high 25th order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S12 in Example 1.
[0084] Table 2
[0085]
[0086]
[0087] like Figure 2 As shown, the optical imaging lens further includes five spacing elements, namely, a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The first spacing element P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacing element P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacing element P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens. The fourth spacing element P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; the fifth spacing element P5 is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens.
[0088] Example 2
[0089] Figure 3 The structure diagram of the optical imaging lens according to Embodiment 2 of the present application is shown. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.
[0090] like Figure 3As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 2 has the same structure as the lens group of the optical imaging lens of Example 1. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 1 and 2, which will not be repeated here.
[0091] like Figure 3 As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 1 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0092] Example 3
[0093] Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.
[0094] like Figure 4 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 3 has the same structure as the lens group of the optical imaging lens of Example 1. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 1 and 2, which will not be repeated here.
[0095] like Figure 4 As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 1 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0096] Figure 5 (A1) shows the axial chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 5 (B1) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 1 to 3, which represent the meridional image curvature and the sagittal image curvature. Figure 5 (C1) in FIG. 1 shows the distortion curves of the optical imaging lenses of Examples 1 to 3, which represent the distortion values corresponding to different half field angles. Figure 5 (D1) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figure 5 It can be seen that the optical imaging lenses of Examples 1 to 3 can achieve good imaging quality.
[0097] Example 4
[0098] Figure 6 FIG. 4 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of the present application. Figure 6 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The optical imaging lens further comprises a stop STO (not shown) disposed on the object side of the first lens E1. Light from the object sequentially passes through each surface S1 to S12 and is finally imaged on an imaging surface (not shown).
[0099] Table 3 shows the basic parameters of the lens group of the optical imaging lens of Example 4, wherein the units of the curvature radius, thickness / distance and effective focal length are all millimeters (mm).
[0100] Table 3
[0101]
[0102] Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.
[0103] Table 4
[0104] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.7788E-01 -4.6452E-02 2.4750E-01 -9.3121E-01 1.6681E+00 -1.0743E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -2.9817E-01 4.4155E-02 1.8837E-03 3.3164E-01 -3.9575E-01 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -2.1420E-01 -3.5856E-01 1.6040E+00 -6.7243E+00 1.5192E+01 -1.7894E+01 7.3549E+00 0.0000E+00 0.0000E+00 S4 -1.1769E-01 -6.8797E-01 1.0305E+00 1.7584E-01 -1.6840E+00 9.7245E-01 0.0000E+00 0.0000E+00 0.0000E+00 S5 -1.1534E-01 -5.5046E-01 -4.4141E-01 6.6523E+00 -1.4009E+01 1.3054E+01 -5.0395E+00 3.8242E-01 0.0000E+00 S6 -3.4107E-02 -3.6754E-01 4.9614E-01 2.6650E-02 -5.8097E-01 4.8413E-01 -1.0729E-01 0.0000E+00 0.0000E+00 S7 4.8239E-02 1.9984E-01 -8.2427E-01 1.1848E+00 -9.8041E-01 4.4358E-01 -8.1493E-02 0.0000E+00 0.0000E+00 S8 1.2731E-01 -1.3191E-01 -2.4799E-02 -1.0825E-01 3.3318E-01 -3.2097E-01 1.4023E-01 -2.3066E-02 0.0000E+00 S9 6.4971E-01 -1.3029E+00 1.3571E+00 -9.1327E-01 9.4489E-02 3.5651E-01 -2.6054E-01 7.4834E-02 -8.0295E-03 S10 2.4034E-01 -5.9053E-01 5.0848E-01 -2.8594E-01 8.5002E-02 7.7031E-03 -1.3782E-02 3.6811E-03 -3.2650E-04 S11 -5.3538E-01 1.5733E-01 2.8584E-01 -3.4162E-01 1.6499E-01 -3.7984E-02 2.8720E-03 3.3098E-04 -5.1971E-05 S12 -4.0425E-01 4.0286E-01 -2.4522E-01 9.9798E-02 -2.8066E-02 5.3941E-03 -6.7478E-04 4.9221E-05 -1.5766E-06
[0105] like Figure 6 As shown, the optical imaging lens further includes five spacing elements, namely, a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The first spacing element P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacing element P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacing element P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens. The fourth spacing element P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; the fifth spacing element P5 is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens.
[0106] Example 5
[0107] Figure 7The structure diagram of the optical imaging lens according to Embodiment 5 of the present application is shown. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 4 will be omitted.
[0108] like Figure 7 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 5 has the same structure as the lens group of the optical imaging lens of Example 4. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 3 and 4, which will not be repeated here.
[0109] like Figure 7 As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 4 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0110] Example 6
[0111] Figure 8 A schematic structural diagram of an optical imaging lens according to Example 6 of the present application is shown.
[0112] like Figure 8 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 6 has the same structure as the lens group of the optical imaging lens of Example 4. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 3 and 4, which will not be repeated here.
[0113] like Figure 8 As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 4 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0114] Fig. 9 (A2) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig. 9 (B2) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional image curvature and the sagittal image curvature. Fig. 9 (C2) in FIG. 5 shows the distortion curves of the optical imaging lenses of Examples 4 to 6, which represent the distortion values corresponding to different half field angles. Fig. 9(D2) in FIG. 4 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig. 9 It can be seen that the optical imaging lenses of Examples 4 to 6 can achieve good imaging quality.
[0115] Example 7
[0116] Fig.10 FIG. 2 shows a schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application. Fig.10 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens comprises, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The optical imaging lens further comprises a stop STO (not shown) disposed on the object side of the first lens E1. Light from the object sequentially passes through each surface S1 to S12 and is finally imaged on an imaging surface (not shown).
[0117] Table 5 shows a basic parameter table of the lens group of the optical imaging lens of Example 7, wherein the units of the curvature radius, thickness / distance and effective focal length are all millimeters (mm).
[0118] Table 5
[0119]
[0120] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 7, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.
[0121] Table 6
[0122] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.8414E-01 7.0920E-01 -7.0500E+00 4.3625E+01 -1.6556E+02 3.9185E+02 -5.6311E+02 4.4916E+02 -1.5252E+02 S2 -4.1323E-01 -7.0270E-01 8.5654E+00 -4.9215E+01 1.8606E+02 -4.4888E+02 6.6013E+02 -5.3893E+02 1.8731E+02 S3 -3.1909E-01 3.8475E-02 -5.1886E+00 4.7577E+01 -2.2716E+02 6.3857E+02 -1.0702E+03 9.8393E+02 -3.8309E+02 S4 1.3071E-01 -1.7571E+00 2.4399E-01 2.2017E+01 -8.3754E+01 1.5432E+02 -1.5909E+02 8.7461E+01 -1.9846E+01 S5 2.7364E-01 -1.8726E+00 -3.9924E+00 4.2170E+01 -1.2490E+02 1.9851E+02 -1.8135E+02 8.9790E+01 -1.8732E+01 S6 2.4536E-01 -2.9268E-01 -4.5796E+00 2.1599E+01 -4.7219E+01 5.9400E+01 -4.4183E+01 1.8178E+01 -3.2054E+00 S7 -1.4279E-01 1.4174E+00 -4.3445E+00 6.5674E+00 -3.9411E+00 -2.3323E+00 4.9315E+00 -2.6194E+00 4.6165E-01 S8 1.5389E-01 -6.6279E-01 8.9433E-01 -2.0842E-01 -1.4520E+00 2.8304E+00 -2.5609E+00 1.1687E+00 -2.1190E-01 S9 7.7822E-01 -1.8864E+00 3.0094E+00 -3.5968E+00 3.0339E+00 -1.7129E+00 6.0886E-01 -1.2270E-01 1.0683E-02 S10 2.3764E-01 -3.9635E-01 2.1707E-01 -3.7001E-02 -1.8369E-02 9.9614E-03 -1.2809E-03 -1.1202E-04 2.7093E-05 S11 -1.4450E-01 -2.5685E-01 5.9620E-01 -6.3571E-01 3.8337E-01 -1.3645E-01 2.8552E-02 -3.2618E-03 1.5747E-04 S12 -3.4004E-01 2.8940E-01 -1.8556E-01 8.2748E-02 -2.6499E-02 6.1853E-03 -9.8861E-04 9.3806E-05 -3.8899E-06
[0123] like Fig.10As shown, the optical imaging lens further includes five spacing elements, namely, a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The first spacing element P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacing element P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacing element P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens. The fourth spacing element P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens; the fifth spacing element P5 is placed on the image side of the fifth lens and is in at least partial contact with the image side surface of the fifth lens.
[0124] Example 8
[0125] Fig.11 The structure diagram of the optical imaging lens according to Embodiment 8 of the present application is shown. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 7 will be omitted.
[0126] like Fig.11 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 8 has the same structure as the lens group of the optical imaging lens of Example 7. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 5 and 6, which will not be repeated here.
[0127] like Fig.11 As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 7 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0128] Example 9
[0129] Fig.12 A schematic structural diagram of an optical imaging lens according to Example 9 of the present application is shown.
[0130] like Fig.12 As shown, the optical imaging lens comprises a lens barrel P0, a lens group and a spacer element group. The lens group of the optical imaging lens of Example 9 has the same structure as the lens group of the optical imaging lens of Example 7. The basic parameters and the high-order coefficient table of aspheric surfaces are detailed in Tables 5 and 6, which will not be repeated here.
[0131] like Fig.12As shown, the optical imaging lens further includes five spacing elements, namely a first spacing element P1, a second spacing element P2, a third spacing element P3, a fourth spacing element P4 and a fifth spacing element P5. The difference between this embodiment and embodiment 7 is that the structure dimensions of at least some elements in the lens barrel and the spacing element group are different, see Table 8.
[0132] Fig.13 (A3) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig.13 (B3) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 7 to 9, which represent the meridional image curvature and the sagittal image curvature. Fig.13 (C3) in FIG. 1 shows the distortion curves of the optical imaging lenses of Examples 7 to 9, which represent the distortion values corresponding to different half field angles. Fig.13 (D3) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig.13 It can be seen that the optical imaging lenses of Examples 7 to 9 can achieve good imaging quality.
[0133] Table 7 shows some parameter values of the optical imaging lenses of Examples 1 to 9. Among them, the unit of Semi-FOV is degree (°), and the units of other parameters are millimeters (mm).
[0134] Table 7
[0135]
[0136] Table 8 gives the parameter values of at least some of the elements in the lens barrel and the spacer element group of the optical imaging lens of Examples 1 to 9, all in millimeters (mm). Among them, some parameters can be calculated according to Figure 1 The measurement is carried out using the marking method shown.
[0137] Table 8
[0138]
[0139]
[0140] In summary, the optical imaging lenses of Examples 1 to 9 satisfy the relationship shown in Table 9.
[0141] Table 9
[0142] Conditional / Example 1 2 3 4 5 6 7 8 9 (f2 / R3)×(D2s / d2m) 1.64 1.79 1.20 1.12 1.22 1.19 1.13 1.51 1.12 R2 / R1 0.91 0.91 0.91 2.93 2.93 2.93 0.83 0.83 0.83 R1 / R3×(d1s / d2s) 0.83 0.84 0.77 0.96 0.97 0.93 3.89 3.74 4.03 EP01 / CT1 2.36 2.21 2.17 1.90 2.20 1.71 2.17 2.43 2.22 CT4 / EP34 1.39 1.88 1.88 2.56 1.81 1.86 1.22 1.62 1.54 f12 / d2m 1.86 1.67 1.44 1.76 1.58 1.44 1.64 1.68 1.72 f45 / DT41 3.37 3.37 3.37 2.93 2.93 2.93 4.24 4.24 4.24 R7 / d3m -1.29 -1.17 -1.23 -1.91 -2.17 -2.35 -0.94 -0.92 -0.91 (CP3+CP4) / (CT3+CT4) 0.56 0.48 0.54 0.51 0.39 0.42 0.59 0.49 0.45 (d5s-d4s) / (f5-f6) -0.02 -0.85 -0.71 -0.40 -0.40 -0.36 -0.43 2.01 0.75 (D5m-d5m) / (2×DT42) 0.74 0.59 0.62 0.74 0.56 0.74 0.84 0.76 0.78 (D3s-d3s) / T34 5.66 7.30 9.60 1.38 2.26 2.16 6.61 10.55 10.96 (d5m+D5m) / (2×Yc52) 4.33 4.23 4.28 6.38 6.31 6.11 3.83 3.74 3.73 EP45 / |SAG42| 0.68 0.84 0.76 0.80 0.77 0.80 0.77 0.96 0.96
[0143] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.
[0144] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.
Claims
1. An optical imaging lens, characterized in that: Comprising: A lens barrel, a lens group and a spacer element group disposed within the lens barrel, wherein, The lens group sequentially includes, 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 and a sixth lens; The spacer element group includes: a first spacer element and a second spacer element, wherein, the first spacer element is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens, and the second spacer element is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; The number of lenses with optical power in the optical imaging lens is six; The object side surface of the first lens is convex and the image side surface is concave; The object side surface of the second lens is convex and the image side surface is convex; The optical imaging lens satisfies: 0.80 < R2 / R1 < 2.95 and 0.75 < R1 / R3 × (d1s / d2s) < 4.05; where, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, d1s is the maximum inner diameter of the object side surface of the first spacer element in the direction perpendicular to the optical axis, and d2s is the maximum inner diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis.
2. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 1.10 < (f2 / R3) × (D2s / d2m) < 1.80, where, f2 is the effective focal length of the second lens, D2s is the maximum outer diameter of the object side surface of the second spacer element in the direction perpendicular to the optical axis, and d2m is the maximum inner diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis.
3. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 1.70 < EP01 / CT1 < 2.45, where, EP01 is the distance from the object side end face of the lens barrel to the object side surface of the first spacer element along the optical axis direction, and CT1 is the central thickness of the first lens on the optical axis.
4. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 1.40 < f12 / d2m < 1.90, where, f12 is the combined focal length of the first lens and the second lens, and d2m is the maximum inner diameter of the image side surface of the second spacer element in the direction perpendicular to the optical axis.
5. The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 2.90 < f45 / DT41 < 4.25, where, f45 is the combined focal length of the fourth lens and the fifth lens, and DT41 is the maximum effective radius of the object side surface of the fourth lens.
6. The optical imaging lens according to any one of claims 1-5, wherein, The spacer element group further includes: a third spacer element and a fourth spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; The optical imaging lens satisfies: 1.20 < CT4 / EP34 < 2.60, where CT4 is the central thickness of the fourth lens on the optical axis, and EP34 is the distance along the optical axis between the image side surface of the third spacer element and the object side surface of the fourth spacer element.
7. The optical imaging lens according to any one of claims 1-5, characterized in that The spacer element group further includes: a third spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: -2.40 < R7 / d3m < -0.90, where R7 is the radius of curvature of the object side surface of the fourth lens, and d3m is the maximum inner diameter of the image side surface of the third spacer element in a direction perpendicular to the optical axis.
8. The optical imaging lens according to any one of claims 1-5, characterized in that The spacer element group further includes: a third spacer element and a fourth spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens, and the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; The optical imaging lens satisfies: 0.35 < (CP3 + CP4) / (CT3 + CT4) < 0.60, where CP3 is the maximum thickness of the third spacer element along the optical axis, CP4 is the maximum thickness of the fourth spacer element along the optical axis, CT3 is the central thickness of the third lens on the optical axis, and CT4 is the central thickness of the fourth lens on the optical axis.
9. The optical imaging lens according to any one of claims 1-5, characterized in that The spacer element group includes: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; The optical imaging lens satisfies: -0.90 < (d5s - d4s) / (f5 - f6) < 2.05, where d4s is the maximum inner diameter of the object side surface of the fourth spacer element in a direction perpendicular to the optical axis, d5s is the maximum inner diameter of the object side surface of the fifth spacer element in a direction perpendicular to the optical axis, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.
10. The optical imaging lens according to any one of claims 1-5, characterized in that The spacer element group further includes: a fifth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; The optical imaging lens satisfies: 0.55 < (D5m - d5m) / (2 × DT42) < 0.85, where D5m is the maximum outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and DT42 is the maximum effective radius of the image side surface of the fourth lens.
11. The optical imaging lens according to any one of claims 1 - 5, characterized in that The spacer element group further includes: a third spacer element, wherein the third spacer element is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; The optical imaging lens satisfies: 1.35 < (D3s - d3s) / T34 < 11.00, where D3s is the maximum outer diameter of the object side surface of the third spacer element in a direction perpendicular to the optical axis, d3s is the maximum inner diameter of the object side surface of the third spacer element in a direction perpendicular to the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.
12. The optical imaging lens according to any one of claims 1 - 5, characterized in that The spacer element group further includes: a fifth spacer element, wherein the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; The optical imaging lens satisfies: 3.70 < (d5m + D5m) / (2 × Yc52) < 6.40, where d5m is the maximum inner diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, D5m is the maximum outer diameter of the image side surface of the fifth spacer element in a direction perpendicular to the optical axis, and Yc52 is the distance from the inflection point farthest from the optical axis among the effective diameters of the image side surface of the fifth lens to the optical axis.
13. The optical imaging lens according to any one of claims 1 - 5, characterized in that The spacer element group includes: a fourth spacer element and a fifth spacer element, wherein the fourth spacer element is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens, and the fifth spacer element is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; The optical imaging lens satisfies: 0.65 < EP45 / |SAG42| < 1.00, where EP45 is the distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element along the optical axis, and SAG42 is the axial distance between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens.