Optical imaging lens
By optimizing the design of the lens group and the spacer element group, the balance between a wide angle of view and a small head of the six-element optical imaging lens was solved, resulting in a reduction of ghosting and an improvement in MTF performance, thus enhancing image quality.
Patent Information
- Application Number
- CN202520188042.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-06
AI Technical Summary
Existing six-element optical imaging lenses, while pursuing a wide angle of view and a small head, struggle to balance ghosting and MTF performance, resulting in poor image quality.
By designing specific radii of curvature and inner diameter ratios for lens groups and spacer elements, the optical power and lens spacing of the optical imaging lens can be controlled, thereby optimizing the lens structure to reduce ghosting and improve MTF performance.
It achieves effective reduction of ghosting and improved MTF performance while maintaining a wide field of view and a small head, thus enhancing imaging stability and clarity.
Smart Images
Figure CN223870889U_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 the 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 devices, the market's requirements for the mechanical size of lenses are becoming increasingly stringent, expecting lenses to have a smaller volume while maintaining high performance.
[0003] However, the requirements such as wide 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 wide viewing angle, weak ghosting, and small head will restrict each other. The superposition of the two indicators of wide viewing angle and small head will increase the risks of ghosting and MTF (modulation transfer function) performance.
[0004] Therefore, designing a six-piece optical lens that can minimize the risks of ghosting and MTF performance while achieving a wide viewing angle and meeting the small head indicator is of great significance for meeting the comprehensive performance requirements of the market for optical lenses. Summary of the Utility Model
[0005] In the 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 within 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. 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 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 radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature 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 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.
[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 the 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 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 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 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 the direction perpendicular to the optical axis.
[0012] In one embodiment, the spacer group further includes a third spacer and a fourth spacer, wherein the third spacer is disposed on the image side of the third lens and at least partially contacts the image side of the third lens, and the fourth spacer is disposed on the image side of the fourth lens and at least partially contacts the image side 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 along the optical axis, CP4 is the maximum thickness of the fourth spacer 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 at least partially contacts the image side of the fourth lens, and the fifth spacer element is placed on the image side of the fifth lens and at least partially contacts the image side 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 of the fourth spacer element in the direction perpendicular to the optical axis, d5s is the maximum inner diameter of the object side of the fifth spacer element in the 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 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 the direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image side surface of the fifth spacer element in the 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 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 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 of the third spacer element in the direction perpendicular to the optical axis, d3s is the maximum inner diameter of the object side of the third spacer element in the direction perpendicular to the optical axis, and T34 is the air gap 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, where 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, where 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 in the direction of 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. The lens group includes, in sequence 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, 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 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, it can not only ensure a large viewing angle, but also better correct aberrations and reduce the size of the lens head. 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 annular ghost image in a small angle range, and at the same time satisfies the MTF (modulation transfer function) performance and improves the imaging stability. 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 Shows a structural layout diagram of an optical imaging lens according to the present application and a schematic diagram of some parameters;
[0022] Figure 2 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application;
[0023] Figure 3 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 2 of the present application;
[0024] Figure 4 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 3 of the present application;
[0025] Figure 5 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 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 4 of the present application;
[0027] Figure 7 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 5 of the present application;
[0028] Figure 8 Shows a schematic structural diagram of the optical imaging lens according to Embodiment 6 of the present application;
[0029] Figure 9 The on-axis chromatic aberration curve (A2), astigmatism curve (B2), distortion curve (C2), and magnification chromatic aberration curve (D2) of the optical imaging lenses of Embodiments 4 to 6 of this application are shown.
[0030] Figure 10 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown;
[0031] Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown;
[0032] Figure 12 A schematic diagram of the structure of an optical imaging lens according to Embodiment 9 of this application is shown;
[0033] Figure 13 The on-axis chromatic aberration curve (A3), astigmatism curve (B3), distortion curve (C3), and magnification chromatic aberration curve (D3) of the optical imaging lenses of Embodiments 7 to 9 of this application are shown.
[0034] Figure 14 The ghost image analysis diagram is shown when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=0.83;
[0035] Figure 15 The modulation transfer function curve of the optical imaging lens is shown when R1 / R3×(d1s / d2s)=0.83;
[0036] Figure 16 The ghost image analysis diagram is shown when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=0.4;
[0037] Figure 17 The modulation transfer function curve is shown when the optical imaging lens satisfies R1 / R3×(d1s / d2s)=5.0. Detailed Implementation
[0038] To better understand this application, various aspects of this application 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 this application and are not intended to limit the scope of this 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 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 this application, the first lens discussed below may also be referred to as the second lens or the third lens.
[0040] 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.
[0041] Those skilled in the art will understand that a lens is an optical component formed by two refracting surfaces surrounding a transparent medium. The refracting surfaces can be spherical (including planes, i.e., spheres with infinite radius of curvature) or aspherical. The line connecting the centers of curvature of the two refracting surfaces is the optical axis of the lens. In this document, the surface of the two refracting surfaces closer to the object being photographed is referred to as the object-side surface of the lens, and the surface closer to the imaging surface is referred to as the image-side surface of the lens.
[0042] In this paper, 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 shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine convexity or concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.
[0043] The solutions described in the embodiments of this application can be simulated using software / tools such as ZEMAX and CODE V. For some embodiments, CODE V is preferred for simulation. During the simulation process using software / tools such as those described above, the lens surface profile can be appropriately adjusted based on the surface profile model provided by the software / tool.
[0044] 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 this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.
[0045] 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 application 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 formalized sense, unless expressly so specified herein.
[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. 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 application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer element in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer element, etc. of that embodiment.
[0047] The present application will now be described in detail with reference to the accompanying drawings and embodiments.
[0048] For six-element wide-angle lenses, the requirements of wide angle of view, weak ghosting, and good manufacturability are often contradictory and difficult to balance. For example, the surface shape of the first lens is convex and concave, which helps to realize the design of the wide-angle optical system. By controlling the curvature radius 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, it is easy to produce ring ghosting problems, 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 arranged 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 it 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, it can not only ensure a large field angle, but also better correct aberrations and reduce the size of the lens head. However, when the value of R2 / R1 is small, it is easy to produce the problem of annular ghost images.
[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 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 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 images in a small angle range and at the same time satisfying the MTF performance. When d1s / d2s is small, that is, when d2s takes a relatively large value and R1 / R3 × (d1s / d2s) < 0.75, the object side surface of the second spacer element will reflect part of the stray light, thus forming annular ghost images. And when d2s takes a relatively small value, the MTF quality will decline, 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 circular ghost images and at the same time improve the MTF performance. Exemplarily, when the optical imaging lens satisfies 0.80 < R2 / R1 < 2.95, Figure 14 shows the ghost image analysis diagram when the optical imaging lens satisfies R1 / R3 × (d1s / d2s) = 0.83, Figure 15The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 0.83 is shown. Figure 16 The ghost image analysis diagram when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 0.4 is shown. Figure 17 The modulation transfer function curve when the optical imaging lens satisfies R1 / R3×(d1s / d2s) = 5.0 is shown.
[0052] As Figure 14 shown, when the optical imaging lens satisfies the range of 0.75 < R1 / R3×(d1s / d2s) < 4.05 of the present application, it can effectively eliminate circular ghost images, and at the same time can improve the MTF performance, and good imaging quality can be obtained for each field of view. And as Figure 16 and Figure 17 shown, when the optical imaging lens does not satisfy the range of 0.75 < R1 / R3×(d1s / d2s) < 4.05 of the present application, its optical performance is poor. Specifically, Figure 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. Figure 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 risk of ghost images 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 stop. The aperture stop may be disposed on the object side of the first lens. It should be noted that the location of the aperture stop disclosed herein is merely an example and not a limitation; in alternative embodiments, the aperture stop may be disposed in other locations as needed.
[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. The first spacer element is positioned on the image side of the first lens and at least partially contacts the image side of the first lens. The second spacer element is positioned on the image side of the second lens and at least partially contacts the image side of the second lens. The third spacer element is positioned on the image side of the third lens and at least partially contacts the image side of the third lens. The fourth spacer element is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens. The fifth spacer element is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens. It should be understood that this application does not specifically limit the number of spacer elements; 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. Proper use of spacer elements can effectively avoid stray light risks, reduce interference with image quality, and thus 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 ring surface, and an inner ring 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 furthest from the optical axis is the outer ring surface, and the surface of the lens barrel closest to the optical axis is the inner ring surface.
[0057] In an exemplary embodiment, the lens group may include at least one chamfered lens. The outer peripheral surface of the chamfered lens may have a chamfered portion and a non-chamfered portion, and the outer diameter of the chamfered portion of the lens is smaller than the outer diameter of the non-chamfered portion. When the outer peripheral surface of the lens has a chamfered portion, the outer diameter of the lens generally refers to the outer diameter of the non-chamfered portion of the lens.
[0058] In an exemplary embodiment, the spacer group may include at least one truncated spacer element. The outer peripheral surface of the truncated spacer element may have a truncated portion and a non-truncated portion, and the outer diameter of the truncated portion of the spacer element is smaller than the outer diameter of the non-truncated portion of the spacer element. The outer diameter of the spacer element typically refers to the maximum outer diameter of the non-truncated 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 significant differences 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 the 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 to reasonably distribute the optical power of the system and obtain a larger field angle.
[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 to reasonably distribute the optical power of the system, optimize the system aberration, and enable the lens to have a larger imaging angle 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 1.2 < 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 the 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 to 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 this application 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 center thickness of the third lens along the optical axis, and CT4 is the center thickness of the fourth lens along the optical axis. By controlling the maximum thicknesses of the third and fourth spacers along the optical axis within a reasonable range, the gaps between the third and fourth lenses, and between the fourth and fifth lenses, can be controlled, reducing the risk of drop scratches between the lenses.
[0065] In an exemplary embodiment, the optical imaging lens according to this application 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 the direction perpendicular to the optical axis, d5s is the maximum inner diameter of the object-side surface of the fifth spacer element in the 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 effectively controls the aperture of the fifth and sixth lenses, reducing the rear end size of the lens barrel.
[0066] In an exemplary embodiment, the optical imaging lens according to this application 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 the direction perpendicular to the optical axis, d5m is the maximum inner diameter of the image-side surface of the fifth spacer element in the 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 beneficial for controlling the light-transmitting apertures of the fourth and fifth lenses and reducing the rear end size of the lens barrel.
[0067] In an exemplary embodiment, the optical imaging lens according to this application 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 the direction perpendicular to the optical axis, d3s is the maximum inner diameter of the object-side surface of the third spacer element in the direction perpendicular to the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis. Satisfying 1.35 < (D3s - d3s) / T34 < 11.00 allows for effective control of 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 principal 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 mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the sixth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature continuously changes 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 the aberration that appears during imaging as much as possible, 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 mirror 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 this application focuses on performance optimization of a six-element wide-angle lens. Specifically, it addresses issues such as small R2 / R1 ratios leading to ring ghosting, abnormal lens-support assembly caused by significant differences in the outer diameters of adjacent lenses, and lens manufacturability. The specific power distribution and surface profile of the six lenses are not the primary focus of this application; these settings can be adjusted as needed. In other words, although several specific power distributions and surface profiles for the imaging lens group are shown in the embodiments of this application, it should be understood that these embodiments are merely exemplary, and the imaging lens group in this application should not be limited to the specific cases shown in the embodiments.
[0073] The optical imaging lens according to the above embodiments of this application may employ multiple lenses, such as the six lenses described above. However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the optical imaging lens is not limited to including six lenses. If desired, the optical imaging lens may also include other numbers of lenses.
[0074] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.
[0075] Example 1
[0076] Figure 2 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown. Figure 2 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens, from the object side to the image side, includes, in sequence: 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 also includes an aperture stop STO (not shown) disposed on the object side of the first lens E1. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).
[0077] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance and effective focal length are millimeters (mm).
[0078] Table 1
[0079]
[0080] In Embodiment 1, the object-side surface and image-side surface of the first lens E1 to the sixth lens E6 are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:
[0081]
[0082] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient;
[0083] Ai is the i-th order correction coefficient for the aspherical surface. Table 2 gives the coefficients of the 25th order A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspherical mirror S1-S12 in Example 1.
[0084] Table 2
[0085]
[0086]
[0087] like Figure 2 As shown, the optical imaging lens also includes five spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; and the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens.
[0088] Example 2
[0089] Figure 3 A schematic diagram of the optical imaging lens according to Embodiment 2 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.
[0090] like Figure 3As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 2 has the same structure as that of the optical imaging lens in Embodiment 1. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 1 and 2, and will not be repeated here.
[0091] like Figure 3 As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0092] Example 3
[0093] Figure 4 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.
[0094] like Figure 4 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 3 has the same structure as that of the optical imaging lens in Embodiment 1. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 1 and 2, and will not be repeated here.
[0095] like Figure 4 As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0096] Figure 5 (A1) shows the on-axis chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5 (B1) shows the astigmatism curves of the optical imaging lenses of Examples 1 to 3, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5 (C1) shows the distortion curves of the optical imaging lenses of Examples 1 to 3, which represent the distortion magnitude values corresponding to different half-field angles. Figure 5 (D1) shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviation of different image heights on the imaging plane after light passes through the lens. According to 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 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown. Figure 6 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens, from the object side to the image side, includes, in sequence: 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 also includes an aperture stop STO (not shown) disposed on the object side of the first lens E1. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).
[0099] Table 3 shows the basic parameters of the lens group of the optical imaging lens of Example 4, where the units for radius of curvature, thickness / distance and effective focal length are millimeters (mm).
[0100] Table 3
[0101]
[0102] Table 4 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.
[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 also includes five spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; and the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens.
[0106] Example 5
[0107] Figure 7A schematic diagram of the optical imaging lens according to Embodiment 5 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 4 are omitted.
[0108] like Figure 7 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 5 has the same structure as that of the optical imaging lens in Embodiment 4. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 3 and 4, and will not be repeated here.
[0109] like Figure 7 As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and embodiment 4 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0110] Example 6
[0111] Figure 8 A schematic diagram of the structure of an optical imaging lens according to Embodiment 6 of this application is shown.
[0112] like Figure 8 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 6 has the same structure as that of the optical imaging lens in Embodiment 4. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 3 and 4, and will not be repeated here.
[0113] like Figure 8 As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and embodiment 4 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0114] Figure 9 (A2) shows the on-axis chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 9 (B2) shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 9 (C2) shows the distortion curves of the optical imaging lenses of Examples 4 to 6, which represent the distortion magnitude values corresponding to different half-field angles. Figure 9(D2) shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 9 It can be seen that the optical imaging lenses of Examples 4 to 6 can achieve good imaging quality.
[0115] Example 7
[0116] Figure 10 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown. Figure 10 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens, from the object side to the image side, includes, in sequence: 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 also includes an aperture stop STO (not shown) disposed on the object side of the first lens E1. Light from the object passes sequentially through each surface S1 to S12 and is finally imaged onto the imaging plane (not shown).
[0117] Table 5 shows the basic parameters of the lens group of the optical imaging lens of Example 7, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).
[0118] Table 5
[0119]
[0120] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 7, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.
[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 Figure 10As shown, the optical imaging lens also includes five spacer elements: a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5. The first spacer element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; and the fifth spacer element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens.
[0124] Example 8
[0125] Figure 11 A schematic diagram of the optical imaging lens according to Embodiment 8 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 7 are omitted.
[0126] like Figure 11 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 8 has the same structure as that of the optical imaging lens in Embodiment 7. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 5 and 6, and will not be repeated here.
[0127] like Figure 11 As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and embodiment 7 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0128] Example 9
[0129] Figure 12 A schematic diagram of the structure of an optical imaging lens according to Embodiment 9 of this application is shown.
[0130] like Figure 12 As shown, the optical imaging lens includes a lens barrel P0, a lens group, and a spacer element group. The lens group of the optical imaging lens in Embodiment 9 has the same structure as that of the lens group in Embodiment 7. Its basic parameters and the higher-order coefficients of the aspherical surface are detailed in Tables 5 and 6, and will not be repeated here.
[0131] like Figure 12As shown, the optical imaging lens also includes five spacer elements, namely the first spacer element P1, the second spacer element P2, the third spacer element P3, the fourth spacer element P4, and the fifth spacer element P5. The difference between this embodiment and embodiment 7 is that the structural dimensions of at least some of the elements in the lens barrel and the spacer element group are different, as shown in Table 8.
[0132] Figure 13 (A3) shows the on-axis chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 13 (B3) shows the astigmatism curves of the optical imaging lenses of Examples 7 to 9, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 13 (C3) shows the distortion curves of the optical imaging lenses of Examples 7 to 9, which represent the distortion magnitude values corresponding to different half-field angles. Figure 13 (D3) shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which represent the deviation of different image heights on the imaging plane after light passes through the lens. According to Figure 13 It can be seen that the optical imaging lenses of Examples 7 to 9 can achieve good imaging quality.
[0133] Table 7 provides some parameter values for the optical imaging lenses of Examples 1 to 9. The Semi-FOV is in degrees (°), and all other parameters are in millimeters (mm).
[0134] Table 7
[0135]
[0136] Table 8 provides parameter values for at least some components in the lens barrel and spacer element group of the optical imaging lenses of Examples 1 to 9, all in millimeters (mm). Some parameters can be calculated as follows: Figure 1 The annotation method shown is used for measurement.
[0137] Table 8
[0138]
[0139]
[0140] In summary, the optical imaging lenses of Examples 1 to 9 satisfy the relationships 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] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into 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 merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover 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 features with (but not limited to) technical features with similar functions disclosed in this application.
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 radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, R3 is the radius of curvature 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 along the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element, 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, wherein 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, wherein 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 to the optical axis among the effective diameters of the image side surface of the fifth lens.
13. The optical imaging lens according to any one of claims 1-5, wherein 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 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.