Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative refractive power, the object side of which is a convex surface and the image side is a concave surface; a second lens with negative refractive power; a third lens with negative refractive power, the object side of which is a concave surface and the image side is a concave surface; a fourth lens with positive refractive power; a fifth lens with positive refractive power; a sixth lens with positive refractive power; a seventh lens with negative refractive power; and an eighth lens with positive refractive power.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to an optical imaging lens. Background Technology

[0002] With the development of science and technology, the demand for optical imaging lenses in fields such as panoramic monitoring, drones, action cameras and automotive lenses is constantly increasing, and consequently, the quality requirements for optical imaging lenses are becoming higher and higher.

[0003] For optical imaging lenses used in drones or action cameras, in addition to high resolution, they also need to have a large field of view and a large aperture to achieve a wide field of view and high brightness. However, traditional optical imaging lenses cannot achieve both high resolution and a large field of view or a large aperture. Summary of the Invention

[0004] This application provides an optical imaging lens that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides an optical imaging lens comprising, along the optical axis from the object side to the image side, the following in sequence: a first lens having negative optical power, wherein the object side is convex and the image side is concave; a second lens having negative optical power; a third lens having negative optical power, wherein the object side is concave and the image side is concave; a fourth lens having positive optical power; a fifth lens having positive optical power; a sixth lens having positive optical power; a seventh lens having negative optical power; and an eighth lens having positive optical power.

[0006] According to an exemplary embodiment of this application, the optical imaging lens further includes a ninth lens having negative optical power and disposed between the object side and the first lens.

[0007] According to an exemplary embodiment of this application, the object-side surface of the second lens is convex, and the image-side surface is concave.

[0008] According to an exemplary embodiment of this application, the object-side surface of the fourth lens is convex, and the image-side surface is concave.

[0009] According to an exemplary embodiment of this application, the object-side surface of the fifth lens is convex, and the image-side surface is also convex.

[0010] According to an exemplary embodiment of this application, the object-side surface of the sixth lens is convex, and the image-side surface is also convex.

[0011] According to an exemplary embodiment of this application, the sixth lens is configured as a cemented lens and includes a negative lens with its convex surface facing the object side and a biconvex positive lens.

[0012] According to an exemplary embodiment of this application, the object-side surface of the seventh lens is concave, and the image-side surface is also concave.

[0013] According to an exemplary embodiment of this application, the object-side surface of the eighth lens is convex, and the image-side surface is also convex.

[0014] According to an exemplary embodiment of this application, the object-side surface of the ninth lens is convex, and the image-side surface is concave.

[0015] According to an exemplary embodiment of this application, the maximum aperture D of the optical imaging lens and the effective focal length f9 of the ninth lens satisfy: -1.3≤D / f9≤-0.1.

[0016] According to an exemplary embodiment of this application, the effective focal length f9 of the ninth lens and the effective focal length f1 of the first lens satisfy: 1.3≤f9 / f1≤10.8.

[0017] According to an exemplary embodiment of this application, the radius of curvature R91 of the object side of the ninth lens and the radius of curvature R92 of the image side of the ninth lens satisfy: 1.0≤R91 / R92≤2.5.

[0018] According to an exemplary embodiment of this application, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -9.6≤f1 / f≤-4.8.

[0019] According to an exemplary embodiment of this application, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy: -4.5≤f2 / f≤-2.0.

[0020] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the effective focal length f3 of the third lens and the effective focal length fa of the lens group in front of the aperture stop satisfy: 1.8≤f3 / fa≤2.8.

[0021] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the effective focal length f4 of the fourth lens and the effective focal length fa of the lens group in front of the aperture stop satisfy: -4.5≤f4 / fa≤-2.5.

[0022] According to an exemplary embodiment of this application, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: 0.8≤f4 / f5≤2.0.

[0023] According to an exemplary embodiment of this application, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens satisfy: 2.2≤f6 / f≤5.2.

[0024] According to an exemplary embodiment of this application, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy: -3.5≤f7 / f≤-1.5.

[0025] According to an exemplary embodiment of this application, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical imaging lens satisfy: 2.1≤f8 / f≤3.8.

[0026] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the effective focal length fa of the lens group in front of the aperture stop and the total effective focal length f of the optical imaging lens satisfy: -1.5≤fa / f≤-0.8.

[0027] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the effective focal length fb of the lens group behind the aperture stop and the total effective focal length f of the optical imaging lens satisfy: 2.0≤fb / f≤3.5.

[0028] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the effective focal length fa of the lens group in front of the aperture stop and the effective focal length fb of the lens group behind the aperture stop satisfy: -0.6≤fa / fb≤-0.3.

[0029] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the air gap T4S between the fourth lens and the aperture stop on the optical axis satisfies the following condition with respect to the total optical length TTL of the optical imaging lens: 0≤T4S / TTL≤0.1.

[0030] According to an exemplary embodiment of this application, the optical imaging lens further includes an aperture stop, and the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T4S between the fourth lens and the aperture stop on the optical axis satisfy: 0.2≤T34 / T4S≤1.2.

[0031] According to an exemplary embodiment of this application, the radius of curvature R21 of the object side of the second lens and the radius of curvature R22 of the image side of the second lens satisfy: 0.1≤(R21-R22) / (R21+R22)≤1.2.

[0032] According to an exemplary embodiment of this application, the center thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0≤T45 / (CT4+CT5)≤0.1.

[0033] According to an exemplary embodiment of this application, the maximum field of view (FOV) of the optical imaging lens, the image height (H) of the optical imaging lens at the maximum field of view, and the maximum aperture (D) of the optical imaging lens satisfy the following condition: 1.5 ≤ FOV / H / D ≤ 2.8.

[0034] According to an exemplary embodiment of this application, the total effective focal length f of the optical imaging lens and the entrance pupil diameter ENPD of the optical imaging lens satisfy the following condition: 1.6 ≤ f / ENPD ≤ 1.9.

[0035] According to an exemplary embodiment of this application, the maximum aperture D8 of the eighth lens and the image height H of the optical imaging lens at the maximum field of view satisfy: 0.2≤D8 / H≤1.5.

[0036] According to an exemplary embodiment of this application, the back focal length BFL of the optical imaging lens and the total optical length TTL of the optical imaging lens satisfy the following condition: 0.05≤BFL / TTL≤0.2.

[0037] This application employs nine lenses. By rationally allocating the optical power, surface shape, thickness, spacing, and setting appropriate parameters for each lens, the optical imaging lens can meet the requirements of use in high and low temperature environments and achieve at least one beneficial effect such as high resolution (25 million pixels), large field of view (FOV=196°), large aperture (FNO≤1.8), and no blurring at high and low temperatures. Attached Figure Description

[0038] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0039] Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0040] Figure 2 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0041] Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown;

[0042] Figure 4 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown; and

[0043] Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown. Detailed Implementation

[0044] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0045] 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 drawn strictly to scale.

[0046] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0047] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprises" as 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. It should be noted that in this specification, the expressions "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features.

[0048] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] An optical imaging lens according to an exemplary embodiment of this application may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between adjacent lenses from the first lens to the eighth lens.

[0051] In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens may be convex, and the image-side surface may be concave. By configuring the first lens with the above-described structure, the angle of incidence of light on the object-side surface of the second lens can be reduced, avoiding advanced aberrations caused by excessively large angles of incidence in the rear lens, and improving the image quality of the optical imaging lens.

[0052] In an exemplary embodiment, the second lens may have negative optical power. The object-side surface of the second lens may be convex, and the image-side surface may be concave. The second lens may be an aspherical lens. By configuring the second lens with the above-described structure, aberrations in the central field of view of the optical imaging lens can be effectively corrected, and it is beneficial to achieve a large aperture for the optical imaging lens.

[0053] In an exemplary embodiment, the third lens may have negative optical power. The object-side surface of the third lens may be concave, and the image-side surface may also be concave. The third lens may be an aspherical lens. By configuring the third lens with the above-described structure, aberrations in the central field of view of the optical imaging lens can be effectively corrected, and it is beneficial to achieve a large aperture for the optical imaging lens.

[0054] In an exemplary embodiment, the fourth lens may have positive optical power. The object-side surface of the fourth lens may be convex, and the image-side surface may be concave. The fourth lens may be an aspherical lens. By configuring the fourth lens with the above-described structure, aberrations in the central field of view of the optical imaging lens can be effectively corrected, and it is beneficial to achieve a large aperture for the optical imaging lens.

[0055] In an exemplary embodiment, the fifth lens may have positive optical power. The object-side surface of the fifth lens may be convex, and the image-side surface may also be convex. By configuring the fifth lens with the above-described structure and combining it with an aspherical design, the residual astigmatism of the front lens can be effectively corrected. By configuring the fifth lens with the above-described structure and combining it with a spherical design, and by selecting a material with stable thermal expansion, thermal compensation of the optical imaging lens can be achieved.

[0056] In an exemplary embodiment, the sixth lens may have positive optical power. The object-side surface of the sixth lens may be convex, and the image-side surface may also be convex. By arranging the sixth lens in the above-described structural form, it is beneficial to converge light rays.

[0057] In an exemplary embodiment, the sixth lens can be configured as a cemented lens with positive optical power, specifically comprising a negative lens and a positive lens, wherein the image-side of the negative lens can be cemented with the object-side of the positive lens. The object-side of the negative lens can be convex, and the image-side can be concave; the object-side of the positive lens can be convex, and the image-side can be convex. By setting the sixth lens as a cemented lens, the tolerance sensitivity of the optical imaging lens can be reduced, and the negative lens uses a high-refractive-index, low-Abbe-number material while the positive lens uses a low-refractive-index, high-Abbe-number material, which is beneficial for correcting chromatic aberration in the optical imaging lens and improving the imaging quality of the optical imaging lens.

[0058] In an exemplary embodiment, the seventh lens may have negative optical power. The object-side surface of the seventh lens may be concave, and the image-side surface may also be concave. By configuring the seventh lens with the above-described structure, it is possible to compensate for both the spherical aberration and coma generated by the sixth lens, as well as the residual astigmatism generated by all the preceding lenses, thereby improving the imaging quality of the optical imaging lens.

[0059] In an exemplary embodiment, the eighth lens may have positive optical power. The object-side surface of the eighth lens may be convex, and the image-side surface may also be convex. By configuring the eighth lens as described above, it is advantageous to reduce the principal ray tilt angle (CRA) of the optical imaging lens to meet the CRA curve requirements of the subsequent chip. The CRA of the optical imaging lens may, for example, be less than or equal to 10°.

[0060] In an exemplary embodiment, the optical imaging lens may further include a ninth lens disposed between the object side and the first lens. The ninth lens may have negative optical power. The object side of the ninth lens may be convex, and the image side may be concave. By configuring the ninth lens in the above-described structural form, the angle of incidence of light on the object side of the first lens can be reduced, and the light can enter the rear of the system smoothly, which is beneficial for correcting rear group aberrations. As an example, the ninth lens may be, for example, a protective glass cover or an integral optical structure.

[0061] In an exemplary embodiment, the optical imaging lens may further include an aperture stop. The aperture stop may, for example, be positioned between the fourth and fifth lenses. All lenses between the object side and the aperture stop constitute the front aperture stop lens group. All lenses between the image side and the aperture stop constitute the rear aperture stop lens group.

[0062] In an exemplary embodiment, the maximum aperture D of the optical imaging lens and the effective focal length f9 of the ninth lens can satisfy: -1.3 ≤ D / f9 ≤ -0.1. Properly configuring the ratio of the maximum aperture D of the optical imaging lens to the effective focal length f9 of the ninth lens facilitates the entry of large-angle light into the system, thereby increasing the field of view (FOV) of the optical imaging lens. The maximum FOV of the optical imaging lens can be, for example, 196°.

[0063] In an exemplary embodiment, the effective focal length f9 of the ninth lens and the effective focal length f1 of the first lens can satisfy: 1.3 ≤ f9 / f1 ≤ 10.8. Reasonably configuring the effective focal length value of the ninth lens can effectively reduce spherical aberration and coma of the optical imaging lens.

[0064] In an exemplary embodiment, the radius of curvature R91 of the object-side surface of the ninth lens and the radius of curvature R92 of the image-side surface of the ninth lens can satisfy: 1.0 ≤ R91 / R92 ≤ 2.5. A reasonable configuration of the shapes of the object-side and image-side surfaces of the ninth lens is beneficial for collecting large-angle light rays and allowing them to enter the system, thereby reducing the front aperture and volume of the optical imaging lens.

[0065] In an exemplary embodiment, the effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens can satisfy: -9.6 ≤ f1 / f ≤ -4.8. A reasonable configuration of the effective focal length of the first lens enables it to diverge light rays and ensures a smooth transition in light path, facilitating the entry of large-angle light rays into the rear lens as much as possible, thereby improving the illumination of the optical imaging lens.

[0066] In an exemplary embodiment, the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens can satisfy: -4.5 ≤ f2 / f ≤ -2.0. A reasonable configuration of the effective focal length of the second lens enables it to diverge light rays and ensures a smooth transition in light path, facilitating the entry of large-angle light rays into the rear lens as much as possible, thereby improving the illumination of the optical imaging lens.

[0067] In an exemplary embodiment, the effective focal length f3 of the third lens and the effective focal length fa of the lens group in front of the aperture stop can satisfy: 1.8 ≤ f3 / fa ≤ 2.8. Properly configuring the ratio of the effective focal length of the third lens to the effective focal length of the lens group in front of the aperture stop is beneficial for correcting astigmatism in the entire optical imaging lens.

[0068] In an exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length fa of the lens group in front of the aperture stop can satisfy: -4.5 ≤ f4 / fa ≤ -2.5. Properly configuring the ratio of the effective focal length of the fourth lens to the effective focal length of the lens group in front of the aperture stop is beneficial for correcting astigmatism in the entire optical imaging lens.

[0069] In an exemplary embodiment, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens can satisfy: 0.8 ≤ f4 / f5 ≤ 2.0. Reasonably allocating the effective focal length values ​​of the fourth and fifth lenses is beneficial for correcting aberrations in the central field of view of the optical imaging lens, and also facilitates thermal compensation of the optical imaging lens, ensuring good temperature performance.

[0070] In an exemplary embodiment, the effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens can satisfy: 2.2 ≤ f6 / f ≤ 5.2. When the sixth lens is a thick lens, properly configuring the effective focal length value of the sixth lens can avoid astigmatism; when the sixth lens is a cemented lens, properly configuring the effective focal length value of the sixth lens can effectively correct chromatic aberration of the optical imaging lens.

[0071] In an exemplary embodiment, the effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens can satisfy: -3.5 ≤ f7 / f ≤ -1.5. A reasonable configuration of the effective focal length value of the seventh lens is beneficial for balancing the astigmatism produced by the positive lenses in the lens group behind the aperture stop.

[0072] In an exemplary embodiment, the effective focal length f8 of the eighth lens and the total effective focal length f of the optical imaging lens can satisfy: 2.1 ≤ f8 / f ≤ 3.8. Properly configuring the effective focal length value of the eighth lens is beneficial for refracting the maximum field of view principal ray emitted from the seventh lens, thus ensuring that the image height of the optical imaging lens meets the requirements.

[0073] In an exemplary embodiment, the effective focal length fa of the front lens group and the total effective focal length f of the optical imaging lens can satisfy: -1.5 ≤ fa / f ≤ -0.8. Properly configuring the effective focal length value of the front lens group is beneficial for controlling the light path, reducing the sensitivity of the optical imaging lens, and improving the imaging quality of the optical imaging lens.

[0074] In an exemplary embodiment, the effective focal length fb of the lens group behind the aperture stop and the total effective focal length f of the optical imaging lens can satisfy: 2.0 ≤ fb / f ≤ 3.5. Properly configuring the effective focal length value of the lens group behind the aperture stop is beneficial for controlling the light path, reducing the sensitivity of the optical imaging lens, and improving the imaging quality of the optical imaging lens.

[0075] In an exemplary embodiment, the effective focal length fa of the front lens group and the effective focal length fb of the rear lens group can satisfy: -0.6 ≤ fa / fb ≤ -0.3. Properly configuring the effective focal lengths of the front and rear lens groups and ensuring a reasonable match between their positive and negative optical powers helps control the light path, making it smoother, reducing the sensitivity of the optical imaging lens, and improving its imaging quality.

[0076] In an exemplary embodiment, the air gap T4S between the fourth lens and the aperture stop on the optical axis and the total optical length TTL of the optical imaging lens can satisfy: 0 ≤ T4S / TTL ≤ 0.1. Properly configuring the air gap between the fourth lens and the aperture stop on the optical axis facilitates a smooth transition of light near the aperture stop, thereby achieving high resolution of the optical imaging lens.

[0077] In an exemplary embodiment, the air gap T34 between the third and fourth lenses on the optical axis and the air gap T4S between the fourth lens and the aperture stop on the optical axis can satisfy: 0.2 ≤ T34 / T4S ≤ 1.2. Reasonably allocating the air gaps between the third and fourth lenses on the optical axis, as well as the air gap between the fourth lens and the aperture stop on the optical axis, is beneficial for correcting coma in optical imaging lenses and reducing the tolerance sensitivity of optical imaging lenses.

[0078] In an exemplary embodiment, the radius of curvature R21 of the object-side surface of the second lens and the radius of curvature R22 of the image-side surface of the second lens can satisfy: 0.1 ≤ (R21-R22) / (R21+R22) ≤ 1.2. Reasonably configuring the radii of curvature of the object-side and image-side surfaces of the second lens helps ensure that the light rays emitted from the second lens are relatively gentle when incident on the object-side surface of the third lens, reducing the tolerance sensitivity of the optical imaging lens.

[0079] In an exemplary embodiment, the center thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis can satisfy: 0 ≤ T45 / (CT4+CT5) ≤ 0.1. By rationally configuring the center thickness of the fourth lens on the optical axis, the air gap between the fourth and fifth lenses on the optical axis, and the center thickness of the fifth lens on the optical axis, the temperature drift reduction characteristics of the optical imaging lens can be better realized, and the off-axis aberrations such as coma and astigmatism of the optical imaging lens can be effectively corrected.

[0080] In an exemplary embodiment, the maximum field of view (FOV) of the optical imaging lens, the image height (H) of the optical imaging lens at the maximum FOV, and the maximum aperture (D) of the optical imaging lens can satisfy the following condition: 1.5 ≤ FOV / H / D ≤ 2.8. Reasonably configuring the maximum FOV, image height, and maximum aperture of the optical imaging lens can effectively control the viewpoint position of the optical imaging lens, ensuring that the aperture meets design requirements. When the image height is fixed, a shorter focal length results in a larger FOV, and vice versa. Furthermore, it allows the optical imaging lens to have a reasonable FOV when used with different sensors.

[0081] In an exemplary embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter ENPD of the optical imaging lens can satisfy the following ratio: 1.6 ≤ f / ENPD ≤ 1.9. Properly configuring the ratio of the total effective focal length to the entrance pupil diameter of the optical imaging lens is beneficial for achieving a large aperture, increasing the light transmission of the optical imaging lens, and improving the imaging brightness and contrast.

[0082] In an exemplary embodiment, the maximum aperture D8 of the eighth lens and the image height H of the optical imaging lens at the maximum field of view can satisfy: 0.2 ≤ D8 / H ≤ 1.5. By appropriately configuring the ratio of the maximum aperture of the eighth lens to the image height of the optical imaging lens at the maximum field of view, the light rays emitted from the eighth lens can smoothly transition to the image plane, reducing the principal ray tilt angle (CRA) and improving the tolerance and manufacturability of the optical imaging lens.

[0083] In an exemplary embodiment, the back focal length (BFL) and total optical length (TTL) of the optical imaging lens can satisfy the following ratio: 0.05 ≤ BFL / TTL ≤ 0.2. Properly configuring the ratio of the back focal length to the total optical length of the optical imaging lens is beneficial for miniaturizing the lens and for reducing ghost image energy generated by reflections from the center of the optical imaging lens and filter.

[0084] The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the nine lenses mentioned above. By rationally allocating optical parameters such as the optical power, surface shape, center thickness of each lens, and on-axis spacing between each lens, at least one of the following can be achieved: large field of view, large aperture, high resolution, miniaturization, and no defocusing at high and low temperatures. The optical imaging lens provided in this application can be, for example, an optical imaging lens with a maximum field of view (FOV) of 196°, a relative F-number (FNO) ≤ 1.8, and 25 million pixels.

[0085] In the embodiments of this application, at least one of the mirror surfaces of the first to ninth lenses is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better curvature radius characteristics, offering advantages in improving distortion aberrations and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality.

[0086] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0087] 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.

[0088] Example 1

[0089] The following is for reference Figure 1 An optical imaging lens according to Embodiment 1 of this application is described. Figure 1This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application.

[0090] like Figure 1 As shown, the optical imaging lens 100 includes, in sequence along the optical axis from the object side to the image side: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. An aperture stop STO can be positioned between the fourth lens L4 and the fifth lens L5.

[0091] Lens L9, the ninth lens, has negative optical power; its object-side surface S1 is convex, and its image-side surface S2 is concave. Lens L1, the first lens, has negative optical power; its object-side surface S3 is convex, and its image-side surface S4 is concave. Lens L2, the second lens, has negative optical power; its object-side surface S5 is convex, and its image-side surface S6 is concave. Lens L3, the third lens, has negative optical power; its object-side surface S7 is concave, and its image-side surface S8 is concave. Lens L4, the fourth lens, has positive optical power; its object-side surface S9 is convex, and its image-side surface S10 is concave. Lens L5, the fifth lens, has positive optical power; its object-side surface S11 is convex, and its image-side surface S12 is convex. Lens L6, the sixth lens, has positive optical power; its object-side surface S13 is convex, and its image-side surface S14 is convex. Lens L7, the seventh lens, has negative optical power; its object-side surface S15 is concave, and its image-side surface S16 is concave. The eighth lens L8 has positive optical power, with its object-side surface S17 being convex and its image-side surface S18 being convex. The filter C has an object-side surface S19 and an image-side surface S20. Light from the object passes sequentially through surfaces S1 to S20 and is finally imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S20 are... Figure 1 Not shown in the image.

[0092] Table 1 shows the basic parameters of the optical imaging lens 100 of Embodiment 1, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0093]

[0094] Table 1

[0095] In Example 1, the object-side surface and image-side surface of any one of the second lens L2 to the fourth lens L4 and the sixth lens L6 to the eighth lens L8 are aspherical, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation:

[0096] (1)

[0097] in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the non-spherical surface is the sag; cFor the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The reciprocal of the radius of curvature R in Table 1 above). k The conic coefficient; Ai Is it an aspherical first i -th order correction coefficients. Table 2 gives the conic coefficients applicable to the aspherical mirrors S5-S10 and S13-S18 in Example 1. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 and A 12 .

[0098]

[0099] Table 2

[0100] Example 2

[0101] The following is for reference Figure 2 The optical imaging lens according to Embodiment 2 of this application is described. Figure 2 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application.

[0102] like Figure 2 As shown, the optical imaging lens 200 includes, in sequence along the optical axis from the object side to the image side: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. An aperture stop STO can be positioned between the fourth lens L4 and the fifth lens L5.

[0103] Lens L9, the ninth lens, has negative optical power; its object-side surface S1 is convex, and its image-side surface S2 is concave. Lens L1, the first lens, has negative optical power; its object-side surface S3 is convex, and its image-side surface S4 is concave. Lens L2, the second lens, has negative optical power; its object-side surface S5 is convex, and its image-side surface S6 is concave. Lens L3, the third lens, has negative optical power; its object-side surface S7 is concave, and its image-side surface S8 is concave. Lens L4, the fourth lens, has positive optical power; its object-side surface S9 is convex, and its image-side surface S10 is concave. Lens L5, the fifth lens, has positive optical power; its object-side surface S11 is convex, and its image-side surface S12 is convex. Lens L6, the sixth lens, has positive optical power; its object-side surface S13 is convex, and its image-side surface S14 is convex. Lens L7, the seventh lens, has negative optical power; its object-side surface S15 is concave, and its image-side surface S16 is concave. The eighth lens L8 has positive optical power, with its object-side surface S17 being convex and its image-side surface S18 being convex. The filter C has an object-side surface S19 and an image-side surface S20. Light from the object passes sequentially through surfaces S1 to S20 and is finally imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S20 are... Figure 1 Not shown in the image.

[0104] Table 3 shows the basic parameters of the optical imaging lens 200 of Embodiment 2, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0105]

[0106] Table 3

[0107] In Example 2, the object-side surface and image-side surface of any one of the following lenses—the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8—are aspherical. Table 4 lists the conic coefficients of the aspherical mirrors S5-S10, S11-S12, and S15-S18 that can be used in Example 2. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 and A 12 .

[0108]

[0109] Table 4

[0110] Example 3

[0111] The following is for reference Figure 3 The optical imaging lens according to Embodiment 3 of this application is described. Figure 3This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application.

[0112] like Figure 3 As shown, the optical imaging lens 300 includes, in sequence along the optical axis from the object side to the image side: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. An aperture stop STO can be positioned between the fourth lens L4 and the fifth lens L5.

[0113] Lens L9, the ninth lens, has negative optical power; its object-side surface S1 is convex, and its image-side surface S2 is concave. Lens L1, the first lens, has negative optical power; its object-side surface S3 is convex, and its image-side surface S4 is concave. Lens L2, the second lens, has negative optical power; its object-side surface S5 is convex, and its image-side surface S6 is concave. Lens L3, the third lens, has negative optical power; its object-side surface S7 is concave, and its image-side surface S8 is concave. Lens L4, the fourth lens, has positive optical power; its object-side surface S9 is convex, and its image-side surface S10 is concave. Lens L5, the fifth lens, has positive optical power; its object-side surface S11 is convex, and its image-side surface S12 is convex. Lens L6, the sixth lens, has positive optical power; its object-side surface S13 is convex, and its image-side surface S14 is convex. Lens L7, the seventh lens, has negative optical power; its object-side surface S15 is concave, and its image-side surface S16 is concave. The eighth lens L8 has positive optical power, with its object-side surface S17 being convex and its image-side surface S18 being convex. The filter C has an object-side surface S19 and an image-side surface S20. Light from the object passes sequentially through surfaces S1 to S20 and is finally imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S20 are... Figure 1 Not shown in the image.

[0114] Table 5 shows the basic parameters of the optical imaging lens 300 of Embodiment 3, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0115]

[0116] Table 5

[0117] In Example 3, the object-side surface and image-side surface of any one of the lenses L2 to L4, L5, L7, and L8 are aspherical. Table 6 provides the conic coefficients for the aspherical mirrors S5-S10, S11-S12, and S15-S18 used in Example 3. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 andA 12 .

[0118]

[0119] Table 6

[0120] Example 4

[0121] The following is for reference Figure 4 The optical imaging lens according to Embodiment 4 of this application is described. Figure 4 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application.

[0122] like Figure 4 As shown, the optical imaging lens 400 includes, in sequence along the optical axis from the object side to the image side: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. An aperture stop STO can be positioned between the fourth lens L4 and the fifth lens L5.

[0123] The ninth lens L9 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The first lens L1 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The second lens L2 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The third lens L3 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fourth lens L4 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The fifth lens L5 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The sixth lens is a cemented lens, comprising a negative lens L61 and a positive lens L62; the negative lens L61 has an object-side surface S13 being convex and its image-side surface S14 being concave; the positive lens L62 has an object-side surface convex and its image-side surface S15 being convex. The seventh lens L7 has negative optical power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eighth lens L8 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being convex. Filter C has an object-side surface S20 and an image-side surface S21. Light from the object passes sequentially through surfaces S1 to S21 and is finally imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S21 are... Figure 1 Not shown in the image.

[0124] Table 7 shows the basic parameters of the optical imaging lens 400 of Embodiment 4, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0125]

[0126] Table 7

[0127] In Example 4, the object-side and image-side surfaces of any one of the lenses L2 to L4, L5, L7, and L8 are aspherical. Table 8 provides the conic coefficients for the aspherical mirror surfaces S5-S10, S11-S12, and S16-S19 used in Example 4. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 and A 12 .

[0128]

[0129] Table 8

[0130] Example 5

[0131] The following is for reference Figure 5 The optical imaging lens according to Embodiment 5 of this application is described. Figure 5 This is a schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application.

[0132] like Figure 5 As shown, the optical imaging lens 500 includes, in sequence along the optical axis from the object side to the image side: a ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. An aperture stop STO can be positioned between the fourth lens L4 and the fifth lens L5.

[0133] The ninth lens L9 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The first lens L1 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The second lens L2 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The third lens L3 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fourth lens L4 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The fifth lens L5 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The sixth lens is a cemented lens, comprising a negative lens L61 and a positive lens L62; the negative lens L61 has an object-side surface S13 being convex and its image-side surface S14 being concave; the positive lens L62 has an object-side surface convex and its image-side surface S15 being convex. The seventh lens L7 has negative optical power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eighth lens L8 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being convex. Filter C has an object-side surface S20 and an image-side surface S21. Light from the object passes sequentially through surfaces S1 to S21 and is finally imaged onto the imaging plane IMA. It should be noted that surfaces S1 to S21 are... Figure 1 Not shown in the image.

[0134] Table 9 shows the basic parameters of the optical imaging lens 500 of Embodiment 5, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0135]

[0136] Table 9

[0137] In Example 5, the object-side and image-side surfaces of any one of the following lenses—the second lens L2, the third lens L3, the fifth lens L5, the seventh lens L7, and the eighth lens L8—are aspherical. Table 10 lists the conic coefficients for the aspherical mirror surfaces S5-S8, S11-S12, and S16-S19 used in Example 5. k and coefficients of higher-order terms A 4 , A 6 , A 8 , A 10 and A 12 .

[0138]

[0139] Table 10

[0140] In summary, the conditional expressions in Examples 1 to 5 satisfy the relationships shown in Table 11.

[0141]

[0142] Table 11

[0143] This application also provides an imaging device, wherein the electronic photosensitive element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS), and 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, Along the optical axis from the object side to the image side, in sequence: The ninth lens has negative optical power; The first lens has negative optical power, and its object side is convex while its image side is concave. The second lens has negative optical power; The third lens has negative optical power, and its object side and image side are both concave. The fourth lens has positive optical power; The fifth lens has positive optical power; The sixth lens has positive optical power; The seventh lens has negative optical power; and The eighth lens has positive optical power; The optical imaging lens has nine or ten lenses with optical power. The effective focal length f1 of the first lens and the total effective focal length f of the optical imaging lens satisfy: -9.6 ≤ f1 / f ≤ -4.8; The effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy: -4.5≤f2 / f≤-2.

0.

2. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the second lens is convex, and the image-side surface is concave.

3. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the fourth lens is convex, and the image-side surface is concave.

4. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the fifth lens is convex, and the image-side surface is also convex.

5. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the sixth lens is convex, and the image-side surface is also convex.

6. The optical imaging lens according to claim 1, characterized in that, The sixth lens is configured as a cemented lens and includes a negative lens with its convex surface facing the object side and a biconvex positive lens.

7. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the seventh lens is concave, and the image-side surface is also concave.

8. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the eighth lens is convex, and the image-side surface is also convex.

9. The optical imaging lens according to claim 1, characterized in that, The object-side surface of the ninth lens is convex, and the image-side surface is concave.

10. The optical imaging lens according to claim 1, characterized in that, The maximum aperture D of the optical imaging lens and the effective focal length f9 of the ninth lens satisfy the following condition: -1.3≤D / f9≤-0.

1.

11. The optical imaging lens according to claim 1, characterized in that, The effective focal length f9 of the ninth lens and the effective focal length f1 of the first lens satisfy the following condition: 1.3≤f9 / f1≤10.

8.

12. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R91 of the object side of the ninth lens and the radius of curvature R92 of the image side of the ninth lens satisfy: 1.0≤R91 / R92≤2.

5.

13. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the effective focal length f3 of the third lens and the effective focal length fa of the lens group in front of the aperture stop satisfy: 1.8≤f3 / fa≤2.

8.

14. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the effective focal length f4 of the fourth lens and the effective focal length fa of the lens group in front of the aperture stop satisfy: -4.5≤f4 / fa≤-2.

5.

15. The optical imaging lens according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy the condition: 0.8 ≤ f4 / f5 ≤ 2.

0.

16. The optical imaging lens according to claim 1, characterized in that, The effective focal length f6 of the sixth lens and the total effective focal length f of the optical imaging lens satisfy the following condition: 2.2≤f6 / f≤5.

2.

17. The optical imaging lens according to claim 1, characterized in that, The effective focal length f7 of the seventh lens and the total effective focal length f of the optical imaging lens satisfy the condition: -3.5≤f7 / f≤-1.

5.

18. The optical imaging lens according to claim 1, characterized in that, The effective focal length f8 of the eighth lens and the total effective focal length f of the optical imaging lens satisfy the following condition: 2.1≤f8 / f≤3.

8.

19. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the effective focal length fa of the lens group in front of the aperture stop and the total effective focal length f of the optical imaging lens satisfy: -1.5≤fa / f≤-0.

8.

20. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the effective focal length fb of the lens group behind the aperture stop and the total effective focal length f of the optical imaging lens satisfy: 2.0≤fb / f≤3.

5.

21. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the effective focal length fa of the lens group in front of the aperture stop and the effective focal length fb of the lens group behind the aperture stop satisfy: -0.6≤fa / fb≤-0.

3.

22. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the air gap T4S between the fourth lens and the aperture stop on the optical axis satisfies the following condition with respect to the total optical length TTL of the optical imaging lens: 0 ≤ T4S / TTL ≤ 0.

1.

23. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes an aperture stop, and the air gap T34 between the third lens and the fourth lens on the optical axis and the air gap T4S between the fourth lens and the aperture stop on the optical axis satisfy: 0.2≤T34 / T4S≤1.

2.

24. The optical imaging lens according to claim 1, characterized in that, The radius of curvature R21 of the object side of the second lens and the radius of curvature R22 of the image side of the second lens satisfy: 0.1≤(R21-R22) / (R21+R22)≤1.

2.

25. The optical imaging lens according to claim 1, characterized in that, The center thickness CT4 of the fourth lens on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis satisfy: 0≤T45 / (CT4+CT5)≤0.

1.

26. The optical imaging lens according to claim 1, characterized in that, The maximum field of view (FOV) of the optical imaging lens, the image height (H) of the optical imaging lens at the maximum field of view, and the maximum aperture (D) of the optical imaging lens satisfy the following condition: 1.5 ≤ FOV / H / D ≤ 2.

8.

27. The optical imaging lens according to claim 1, characterized in that, The total effective focal length f of the optical imaging lens and the entrance pupil diameter ENPD of the optical imaging lens satisfy the following condition: 1.6 ≤ f / ENPD ≤ 1.

9.

28. The optical imaging lens according to claim 1, characterized in that, The maximum aperture D8 of the eighth lens and the image height H of the optical imaging lens at the maximum field of view satisfy the following condition: 0.2≤D8 / H≤1.

5.

29. The optical imaging lens according to claim 1, characterized in that, The back focal length BFL of the optical imaging lens and the total optical length TTL of the optical imaging lens satisfy the following condition: 0.05≤BFL / TTL≤0.

2.

30. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens satisfies any one of the following conditions: -1.093≤D / f9≤-0.277, 1.504≤f9 / f1≤10.556, 1.329≤R91 / R92≤2.052, -9.269≤f1 / f≤-5.159, -4.153≤f2 / f≤-3.029, 2.093≤f3 / fa≤2.460, -4.274≤f4 / fa≤-2.976, 1.006≤f4 / f5≤1.604, 2.691≤f6 / f≤4.829, -3.158≤f7 / f≤-1.827, 2.526≤f8 / f≤3.373, -1.375≤f a / f≤-1.078, 2.378≤fb / f≤3.076, -0.486≤fa / fb≤-0.417, 0≤T4S / TTL≤0.012, 0.349≤T34 / T4S≤0.853, 0.408≤(R21-R22) / (R21+R2 2)≤0.940, 0≤T45 / (CT4+CT5)≤0.026, 1.772≤FOV / H / D≤2.328, 1.760≤f / ENPD≤1.800, 0.527≤D8 / H≤1.056, 0.091≤BFL / TTL≤0.100, Wherein, D is the maximum aperture of the optical imaging lens, f9 is the effective focal length of the ninth lens, f1 is the effective focal length of the first lens, f is the total effective focal length of the optical imaging lens, R91 is the radius of curvature of the object-side surface of the ninth lens, R92 is the radius of curvature of the image-side surface of the ninth lens, f2 is the effective focal length of the second lens, the optical imaging lens also includes an aperture stop, f3 is the effective focal length of the third lens, fa is the effective focal length of the lens group before the aperture stop, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, f8 is the effective focal length of the eighth lens, fb is the effective focal length of the lens group after the aperture stop, and T4S is the effective focal length of the fourth lens and... The aperture stop is the air gap on the optical axis, TTL is the total optical length of the optical imaging lens, T34 is the air gap between the third lens and the fourth lens on the optical axis, R21 is the radius of curvature of the object side of the second lens, R22 is the radius of curvature of the image side of the second lens, CT4 is the center thickness of the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, FOV is the maximum field of view of the optical imaging lens, H is the image height of the optical imaging lens at the maximum field of view, ENPD is the entrance pupil diameter of the optical imaging lens, D8 is the maximum aperture of the eighth lens, and BFL is the back focal length of the optical imaging lens.

Images