Optical lens and electronic equipment

Abstract

The invention discloses an optical lens and electronic equipment, and the optical lens sequentially comprises a first lens with positive focal power from a first side to a second side along an optical axis, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens and a sixth lens from the first side to the second side, the first side surface of the second lens is a concave surface; the third lens has positive focal power, and the first side surface of the third lens is a convex surface; the first side face of the fourth lens is a convex face, and the second side face of the fourth lens is a concave face.

Description

Technical Field

[0001] The present application relates to the field of optical devices, and particularly to a four-piece optical lens and an electronic device. Background Art

[0002] The lidar lens is a key component for the autonomous driving assistance system to obtain external information. With the rapid development of the autonomous driving assistance system, the demand for lidar lenses is getting higher and higher, and lidar lenses are developing towards high resolution and miniaturization.

[0003] Compared with ordinary optical lenses, lidar lenses applied to autonomous driving assistance systems have special requirements. For example, lidar lenses need to have a larger clear aperture and a large aperture to achieve long-distance measurement; in order to improve the driver's judgment of the captured images by the lens, lidar lenses need to have the performance of clear imaging within a long focal length and a small field of view.

[0004] However, the existing lidar lenses have weak light passing ability and cannot adapt to darker environments at night or on rainy and cloudy days. The existing lidar lenses cannot achieve both a large aperture and a small diameter, nor can they achieve both a large aperture and high resolution. Summary of the Invention

[0005] The present application provides an optical lens and an electronic device that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0006] A first aspect of the present application provides such an optical lens, which includes: a first lens with positive optical power, whose first side is convex and the second side is concave; a second lens with negative optical power, whose first side is concave; a third lens with positive optical power, whose first side is convex; and a fourth lens with optical power, whose first side is convex and the second side is concave.

[0007] According to an exemplary embodiment of the present application, the second side of the second lens is concave or convex.

[0008] According to an exemplary embodiment of the present application, the second side of the third lens is concave or convex.

[0009] According to an exemplary embodiment of the present application, the fourth lens has positive optical power or negative optical power.

[0010] According to an exemplary embodiment of the present application, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: (TTL×180°) / (H×FOV)≤72.

[0011] According to an exemplary embodiment of the present application, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: TTL / H / tan(FOV) ≤ 20.

[0012] According to an exemplary embodiment of the present application, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens satisfy: D1 / H / θ ≤ 11.

[0013] According to an exemplary embodiment of the present application, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the overall focal length value F of the optical lens satisfy: D1 / H / F ≤ 0.35mm -1 。

[0014] According to an exemplary embodiment of the present application, the overall focal length value F of the optical lens, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens satisfy: (F×θ) / D1 ≤ 0.55.

[0015] According to an exemplary embodiment of the present application, the total optical length TTL of the optical lens and the back focal length BFL of the optical lens satisfy: BFL / TTL ≤ 0.25.

[0016] According to an exemplary embodiment of the present application, the focal length value F2 of the second lens and the focal length value F3 of the third lens satisfy: 0.5 ≤ |F2 / F3| ≤ 4.5.

[0017] According to an exemplary embodiment of the present application, the maximum clear aperture D5 of the first side of the third lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens satisfy: D5 / F ≥ 0.5.

[0018] According to an exemplary embodiment of the present application, the maximum clear aperture D5 of the first side of the third lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens satisfy: 1 ≤ D5 / F ≤ 2.5.

[0019] According to an exemplary embodiment of the present application, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens satisfy: D1 / F ≥ 0.5.

[0020] According to an exemplary embodiment of the present application, the overall focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD ≤ 2.

[0021] According to an exemplary embodiment of the present application, the overall focal length value F of the optical lens and the image height H corresponding to the maximum field of view angle of the optical lens satisfy: 0.5 ≤ F / H ≤ 3.

[0022] According to an exemplary embodiment of the present application, the overall focal length value F of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens satisfy: 0.4 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 2.

[0023] According to an exemplary embodiment of the present application, the overall optical length TTL of the optical lens and the overall focal length value F of the optical lens satisfy: TTL / F ≤ 6.

[0024] According to an exemplary embodiment of the present application, the focal length value F1 of the first lens and the overall focal length value F of the optical lens satisfy: F1 / F ≥ 2.5.

[0025] According to an exemplary embodiment of the present application, the focal length value F1 of the first lens and the overall focal length value F of the optical lens satisfy: 3.5 ≤ F1 / F ≤ 10.

[0026] According to an exemplary embodiment of the present application, the focal length value F2 of the second lens and the overall focal length value F of the optical lens satisfy: F2 / F ≤ -1.

[0027] According to an exemplary embodiment of the present application, the focal length value F3 of the third lens and the overall focal length value F of the optical lens satisfy: F3 / F ≤ 3.

[0028] According to an exemplary embodiment of the present application, the focal length value F4 of the fourth lens and the overall focal length value F of the optical lens satisfy: 1 ≤ |F4 / F| ≤ 22.

[0029] According to an exemplary embodiment of the present application, the curvature radius R2 of the second side of the first lens and the curvature radius R3 of the first side of the second lens satisfy: 0.4 ≤ |R2 / R3| ≤ 4.5.

[0030] According to an exemplary embodiment of the present application, the air gap d4 on the optical axis between the second lens and the third lens and the overall optical length TTL of the optical lens satisfy: d4 / TTL ≥ 0.06.

[0031] According to an exemplary embodiment of the present application, the air gap d4 on the optical axis between the second lens and the third lens and the overall optical length TTL of the optical lens satisfy: 0.1 ≤ d4 / TTL ≤ 0.6.

[0032] According to an exemplary embodiment of the present application, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy: 0.4 ≤ |R7 / R8| ≤ 3.

[0033] According to an exemplary embodiment of the present application, the radius of curvature R7 of the first side surface of the fourth lens and the radius of curvature R8 of the second side surface of the fourth lens satisfy: 0.6 ≤ |R7 / R8| ≤ 2.

[0034] According to an exemplary embodiment of the present application, the radius of curvature R1 of the first side surface of the first lens and the overall focal length value F of the optical lens satisfy: R1 / F ≤ 3.

[0035] According to an exemplary embodiment of the present application, the radius of curvature R1 of the first side surface of the first lens and the overall focal length value F of the optical lens satisfy: 1.2 ≤ R1 / F ≤ 2.5.

[0036] According to an exemplary embodiment of the present application, the radius of curvature R3 of the first side surface of the second lens and the overall focal length value F of the optical lens satisfy: R3 / F ≤ -0.5.

[0037] According to an exemplary embodiment of the present application, the radius of curvature R3 of the first side surface of the second lens and the overall focal length value F of the optical lens satisfy: -3 ≤ R3 / F ≤ -1.

[0038] According to an exemplary embodiment of the present application, the radius of curvature R5 of the first side surface of the third lens and the overall focal length value F of the optical lens satisfy: R5 / F ≤ 3.

[0039] According to an exemplary embodiment of the present application, the focal length value F3 of the third lens and the focal length value F4 of the fourth lens satisfy: |F3 / F4| < 1.

[0040] According to an exemplary embodiment of the present application, the central thickness d7 of the fourth lens on the optical axis and the optical back focal length BFL of the optical lens satisfy: d7 / BFL ≥ 0.4.

[0041] According to an exemplary embodiment of the present application, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R7 of the first side surface of the fourth lens satisfy: 0.3 ≤ R5 / R7 ≤ 3.

[0042] According to an exemplary embodiment of the present application, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R7 of the first side surface of the fourth lens satisfy: 0.5 ≤ R5 / R7 ≤ 2.5.

[0043] According to an exemplary embodiment of the present application, the optical lens satisfies: min(|F1|, |F2|, |F3|, |F4|) = F3, where F1 is the focal length value of the first lens, F2 is the focal length value of the second lens, F3 is the focal length value of the third lens, and F4 is the focal length value of the fourth lens.

[0044] According to an exemplary embodiment of the present application, the air gap d4 between the second lens and the third lens on the optical axis and the curvature radius R4 of the second side of the second lens satisfy: |d4 / R4| ≥ 0.03.

[0045] According to an exemplary embodiment of the present application, the air gap d4 between the second lens and the third lens on the optical axis and the curvature radius R4 of the second side of the second lens satisfy: 0.05 ≤ |d4 / R4| ≤ 0.45.

[0046] According to an exemplary embodiment of the present application, the air gap d2 between the first lens and the second lens on the optical axis and the air gap d4 between the second lens and the third lens on the optical axis satisfy: d4 / d2 ≥ 0.4.

[0047] According to an exemplary embodiment of the present application, the air gap d2 between the first lens and the second lens on the optical axis and the air gap d4 between the second lens and the third lens on the optical axis satisfy: 0.6 ≤ d4 / d2 ≤ 8.

[0048] The second aspect of the present application provides an optical lens which sequentially includes, along the optical axis from the first side to the second side, a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with an optical power; wherein, the focal length value F1 of the first lens and the overall focal length value F of the optical lens satisfy: F1 / F ≥ 2.5.

[0049] The third aspect of the present application provides an electronic device which includes the optical lens in the above exemplary embodiment and an imaging element for converting the optical image formed by the optical lens into an electrical signal.

[0050] The present application uses, for example, four lenses with optical powers, and by optimizing the shapes and optical powers of the respective lenses, at least one of the beneficial effects such as miniaturization, small aperture, long focal length, short back focal length, high light throughput, high resolution, large angular resolution, and low sensitivity of the optical lens can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Other features, purposes, and advantages of the present application will become more obvious by reading the detailed description of the non-limiting embodiments with reference to the following drawings. Among them:

[0052] Figure 1Shows a schematic structural diagram of an optical lens according to Embodiment 1 of the present application;

[0053] Figure 2 Shows a schematic structural diagram of an optical lens according to Embodiment 2 of the present application;

[0054] Figure 3 Shows a schematic structural diagram of an optical lens according to Embodiment 3 of the present application;

[0055] Figure 4 Shows a schematic structural diagram of an optical lens according to Embodiment 4 of the present application;

[0056] Figure 5 Shows a schematic structural diagram of an optical lens according to Embodiment 5 of the present application;

[0057] Figure 6 Shows a schematic structural diagram of an optical lens according to Embodiment 6 of the present application;

[0058] Figure 7 Shows a schematic structural diagram of an optical lens according to Embodiment 7 of the present application;

[0059] Figure 8 Shows a schematic structural diagram of an optical lens according to Embodiment 8 of the present application;

[0060] Figure 9 Shows a schematic structural diagram of an optical lens according to Embodiment 9 of the present application;

[0061] Figure 10 Shows a schematic structural diagram of an optical lens according to Embodiment 10 of the present application;

[0062] Figure 11 Shows a schematic structural diagram of an optical lens according to Embodiment 11 of the present application;

[0063] Figure 12 Shows a schematic structural diagram of an optical lens according to Embodiment 12 of the present application;

[0064] Figure 13 Shows a schematic structural diagram of an optical lens according to Embodiment 13 of the present application;

[0065] Figure 14 Shows a schematic structural diagram of an optical lens according to Embodiment 14 of the present application;

[0066] Figure 15 Shows a schematic structural diagram of an optical lens according to Embodiment 15 of the present application;

[0067] Figure 16 Shows a schematic structural diagram of an optical lens according to Embodiment 16 of the present application;

[0068] Figure 17 shows a schematic structural diagram of an optical lens according to Embodiment 17 of the present application; and

[0069] Figure 18 shows a schematic structural diagram of an optical lens according to Embodiment 18 of the present application. Detailed Embodiments

[0070] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0071] It should be noted that in this specification, the expressions such as first, second, and third are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0072] In the drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0073] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the first side is called the first side surface of the lens, and the surface of each lens closest to the second side is called the second side surface of the lens.

[0074] It should also be understood that the terms "comprising", "including", and / or "having", when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0075] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0076] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0077] The features, principles and other aspects of this application will be described in detail below.

[0078] The optical lens according to an exemplary embodiment of this application may include, for example, four lenses with optical power, namely, a first lens, a second lens, a third lens and a fourth lens, and these four lenses are arranged in sequence along the optical axis from the first side to the second side.

[0079] In an exemplary embodiment, the optical lens can be used as, for example, an imaging lens. At this time, the first side of the optical lens can be the object side, and the second side can be the image side. The light rays from the object side can form an image on the image side. The imaging surface of the optical lens is provided on the second side of the optical lens.

[0080] In an exemplary embodiment, the optical lens can be used as, for example, a projection lens or a lidar emission-end lens. At this time, the second side of the optical lens can be the image source side, and the first side can be the imaging side. The light rays from the image source side can form an image on the imaging side. The image source surface of the optical lens is provided on the second side of the optical lens.

[0081] In an exemplary embodiment, the first lens may have a positive optical power. Its first side surface can be, for example, a convex surface, and its second side surface can be, for example, a concave surface. The first lens is designed as a positive lens convex toward the first side, which can collect as much light as possible into the system. And the second side surface of the first lens is designed as a concave surface, which can make the light rays transition smoothly to the rear system as much as possible, facilitating the realization of low sensitivity and a small front aperture of the optical lens. In addition, the first side surface of the first lens is designed as a convex surface, which can also facilitate the sliding of substances such as water droplets in practical applications and reduce the influence of these substances on imaging. In other examples, the first lens is made of a high refractive index material, which is beneficial to reducing the front aperture of the system and improving the imaging quality of the optical lens.

[0082] In an exemplary embodiment, the second lens may have a negative optical focal length, and its first side surface may be, for example, a concave surface, and the second side surface may be, for example, a concave surface. The second lens is designed as a negative lens, which can diverge the light. At the same field of view angle, the light emitted from the second lens is appropriately divergent and smoothly transitions to the rear system, which is conducive to achieving a large aperture and high light flux of the optical lens and increasing the luminous flux of the pixel. The first side surface of the second lens is designed as a concave surface, which cooperates with the second side surface of the first lens so that the light emitted from the first lens is smoothly incident on the first side surface of the second lens, which is conducive to reducing the sensitivity of the light between the first lens and the second lens. The second side surface of the second lens is designed as a concave surface and has a large radius of curvature, which can make the light rise appropriately, so that the peripheral light can reach a higher imaging position, which is conducive to improving the illumination of the edge field of view.

[0083] In an exemplary embodiment, the second lens may have a negative optical power, and its first side surface may be, for example, a concave surface, and the second side surface may be, for example, a convex surface. The second lens is designed as a negative lens, which can diverge the light and disperse the central light and the edge light of each field of view. Under the same field of view angle, the light emitted from the second side surface of the second lens can make the rear system have a larger light receiving surface, and expand the physical aperture of the aperture, so as to achieve a larger amount of light entering, which is conducive to increasing the illumination of the picture. The first side surface of the second lens is designed as a concave surface, which cooperates with the second side surface of the first lens so that the light emitted from the first lens is smoothly incident on the first side surface of the second lens, which is conducive to reducing the sensitivity of the optical lens. The second side surface of the second lens is designed as a convex surface, which can effectively converge and gather the light and reduce the rear port diameter of the optical lens. In other examples, the second lens is made of a high refractive index material, which cooperates with the concave surface of the first side surface of the second lens, which can make the light present a divergent trend, weaken the convergence effect on the light, so that the peripheral light can reach a higher imaging position, which is conducive to matching the size of the back-end chip.

[0084] In an exemplary embodiment, the third lens may have a positive optical power. Its first side may be, for example, convex, and its second side may be, for example, convex. The third lens is designed as a positive lens, which is beneficial for converging light. At the same time, with a biconvex shape, it can make the light emitted from the second lens converge to the fourth lens through the third lens, which is beneficial for the smooth transition of the light path and rapid convergence. The first side of the third lens is designed as convex, which can compress the height of the light incident through the second lens; the second side of the third lens is designed as convex, which can make the light emitted from the third lens converge further and enter the rear system smoothly, which is beneficial for reducing the front aperture of the optical lens. When used in combination with the second lens with negative optical power, it is beneficial for adjusting the optical path difference between the lights of different fields of view and achieving high resolution of the optical lens. In addition, the second side of the third lens is designed as convex, which can make the light converge after passing through the third lens, and then make the light of the peripheral field of view enter the rear system through the aperture as much as possible and quickly, which is beneficial for improving the overall light transmission and illuminance of the optical lens.

[0085] In an exemplary embodiment, the third lens may have a positive optical power. Its first side may be, for example, convex, and its second side may be, for example, concave. The third lens is designed as a positive lens, which can converge the light. When used in combination with the second lens with negative optical power, it is beneficial for the light to enter the rear system smoothly. The first side of the third lens is designed as convex, which can make the light converge quickly and minimize the overall optical length of the optical lens as much as possible, realizing the miniaturization of the optical lens. The second side of the third lens is designed as concave, which can diverge the light, which is beneficial for increasing the position of the light aperture and expanding the aperture of the aperture, realizing a large aperture of the optical lens. At the same time, it is beneficial for adjusting the optical path difference between the lights of different fields of view and laying a foundation for the subsequent better convergence of the light to the image plane, realizing the high resolution of the optical lens.

[0086] In an exemplary embodiment, the fourth lens may have a positive optical power. Its first side may be, for example, convex, and its second side may be, for example, concave. The fourth lens is designed as a positive lens, which is beneficial for the rapid convergence of light. And its shape is meniscus-shaped (that is, its shape is close to concentric circles), which can make the light with a large front aperture enter the surface of the rear chip quickly and smoothly, reducing the back focal length of the optical lens to a certain extent, and then reducing the overall optical length of the optical lens. In other examples, the fourth lens is an aspherical lens, and the curvature of each position on the surface of the aspherical lens is different, which can effectively correct aberration and field curvature and improve the resolution ability of the optical lens.

[0087] In an exemplary embodiment, the fourth lens may have a negative optical power. Its first side may be, for example, convex, and its second side may be, for example, concave. The fourth lens is designed as a negative lens, which is beneficial for the smooth transition of light rays, and at the same time realizes a small Chief Ray Angle (CRA) of the system. And its shape is crescent-shaped (that is, its shape is close to concentric circles), which can enable the light rays with a large front-end aperture to enter the surface of the rear-end chip quickly and smoothly, reduce the back focal length of the optical lens to a certain extent, and further reduce the overall optical length of the optical lens. In other examples, the fourth lens is an aspherical lens. The curvatures at various positions on the surface of the aspherical lens are different, which can effectively correct aberration and field curvature and improve the resolution ability of the optical lens.

[0088] In an exemplary embodiment, at least one of the first lens to the fourth lens may be configured as an aspherical lens. The curvatures at various positions on the surface of the aspherical lens are different, which can effectively correct aberration and field curvature and improve the resolution ability of the optical lens.

[0089] In an exemplary embodiment, the optical lens may further include a diaphragm. The diaphragm may be disposed, for example, between the second lens and the third lens, or between the third lens and the fourth lens. By disposing the diaphragm between the second lens and the third lens or between the third lens and the fourth lens, it is beneficial for the smooth transition of light rays to the rear of the system, reduces the aperture of the rear-end lens, and reduces the assembly sensitivity of the optical lens. It should be understood that the diaphragm is disposed between the second lens and the third lens or between the third lens and the fourth lens is only exemplary, and the present application does not make specific limitations on this. According to actual needs, the diaphragm can also be disposed at other positions.

[0090] In an exemplary embodiment, the optical lens may further include a filter located between the fourth lens and the imaging surface or the image source surface to filter light rays with different wavelengths. The optical lens may also be provided with a protective glass between the filter and the imaging surface according to actual needs to prevent the internal components (such as chips) of the optical lens from being damaged.

[0091] In an exemplary embodiment, the optical lens may further include a photosensitive element disposed on the second side. Optionally, the photosensitive element disposed on the second side may be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) element.

[0092] In an exemplary embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens may satisfy: (TTL × 180°) / (H × FOV) ≤ 72. In an example, 18 ≤ (TTL × 180°) / (H × FOV) ≤ 54. Reasonably controlling the relationship between the total optical length of the optical lens, the image height corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle of the optical lens is beneficial to reducing the total optical length of the optical lens and realizing the miniaturization of the optical lens when the maximum field of view angle of the optical lens and the image height corresponding to the maximum field of view angle of the optical lens are determined.

[0093] In an exemplary embodiment, the total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens may satisfy: TTL / H / tan(FOV) ≤ 20. In an example, 5 ≤ TTL / H / tan(FOV) ≤ 16. Reasonably controlling the relationship between the total optical length of the optical lens, the image height corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle of the optical lens is beneficial to reducing the total optical length of the optical lens and realizing the miniaturization of the optical lens when the maximum field of view angle of the optical lens and the image height corresponding to the maximum field of view angle of the optical lens are determined.

[0094] In an exemplary embodiment, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens may satisfy: D1 / H / θ ≤ 11. In an example, 4 ≤ D1 / H / θ ≤ 9. Reasonably controlling the relationship between the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height corresponding to the maximum field of view angle of the optical lens, and the radian value of the maximum field of view angle of the optical lens can enable the optical lens to have a smaller front aperture, reduce the volume of the optical lens, and thus realize the miniaturization of the optical lens.

[0095] In an exemplary embodiment, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the overall focal length value F of the optical lens may satisfy: D1 / H / F ≤ 0.35 mm -1 。In an example, 0.1 mm -1 ≤ D1 / H / F ≤ 0.3 mm -1 。Reasonably controlling the relationship between the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, the image height corresponding to the maximum field of view angle of the optical lens, and the overall focal length value of the optical lens can enable the optical lens to have a large target surface and a smaller front aperture when the overall focal length value of the optical lens is certain.

[0096] In an exemplary embodiment, the overall focal length value F of the optical lens, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens may satisfy: (F×θ) / D1 ≤ 0.55. In an example, 0.05 ≤ (F×θ) / D1 ≤ 0.55. Further, 0.2 ≤ (F×θ) / D1 ≤ 0.4. Reasonably controlling the mutual relationship among the overall focal length value of the optical lens, the radian value of the maximum field of view angle of the optical lens, and the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens can enable the optical lens to have a smaller front aperture, reduce the volume of the optical lens, and at the same time can also realize the long focal length characteristic of the optical lens, thereby realizing the long-distance detection of the optical lens.

[0097] In an exemplary embodiment, the overall optical length TTL of the optical lens and the back focal length BFL of the optical lens may satisfy: BFL / TTL ≤ 0.25. In an example, 0.04 ≤ BFL / TTL ≤ 0.18. Reasonably configuring the ratio of the back focal length to the overall optical length of the optical lens can enable the optical lens to meet the special requirements of a short back focal length, reduce the overall optical length of the optical lens while reserving space for the installation and focusing of optical elements, and realize the miniaturization of the optical lens.

[0098] In an exemplary embodiment, the focal length value F2 of the second lens and the focal length value F3 of the third lens may satisfy: 0.5 ≤ |F2 / F3| ≤ 4.5. In an example, 0.8 ≤ |F2 / F3| ≤ 4. Reasonably distributing the focal length values of the second lens and the third lens can enable the second lens to appropriately diverge light, and the light emerging from the second lens can smoothly transition to the third lens and then be quickly converged by the third lens, which is beneficial to realizing the low sensitivity of the optical lens and improving the image quality of the optical lens.

[0099] In an exemplary embodiment, the maximum clear aperture D5 of the first side of the third lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens may satisfy: D5 / F ≥ 0.5. Reasonably configuring the maximum clear aperture of the first side of the third lens corresponding to the maximum field of view angle of the optical lens is beneficial to realizing a large clear aperture and a large aperture of the optical lens. Further, 1 ≤ D5 / F ≤ 2.5 is more beneficial to realizing a large clear aperture and a large aperture of the optical lens, and at the same time can also ensure the miniaturization and low cost of the optical lens.

[0100] In an exemplary embodiment, the maximum clear aperture D1 of the first side of the first lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens may satisfy: D1 / F ≥ 0.5. In an example, 1 ≤ D1 / F ≤ 2.5. Reasonably configuring the maximum clear aperture of the first side of the first lens corresponding to the maximum field of view angle of the optical lens is beneficial to achieving a large clear aperture and a large aperture of the optical lens.

[0101] In an exemplary embodiment, the overall focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens may satisfy: F / ENPD ≤ 2. In an example, F / ENPD ≤ 1.2. Reasonably configuring the ratio of the overall focal length value of the optical lens to the entrance pupil diameter is beneficial to achieving a large aperture of the optical lens and increasing the light transmission amount of the optical lens.

[0102] In an exemplary embodiment, the overall focal length value F of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens may satisfy: 0.5 ≤ F / H ≤ 3. In an example, 1.5 ≤ F / H ≤ 2.2. Reasonably configuring the ratio of the overall focal length value of the optical lens to the image height corresponding to the maximum field of view angle of the optical lens is beneficial to improving the resolution of the optical lens and avoiding problems of abnormal imaging of the optical lens caused by too large or too small image height or focal length. In other words, reasonable image height and focal length play a promoting role in the imaging quality of the optical lens.

[0103] In an exemplary embodiment, the overall focal length value F of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens and the radian value θ of the maximum field of view angle of the optical lens may satisfy: 0.4 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 2. In an example, 0.6 ≤ (H / 2) / (F × tan(θ / 2)) ≤ 1.2. Reasonably controlling the mutual relationship between the overall focal length value of the optical lens, the image height corresponding to the maximum field of view angle of the optical lens and the radian value of the maximum field of view angle of the optical lens can constrain the ratio of the actual image height to the ideal image height of the optical lens within a reasonable range, which is beneficial to achieving a large angular resolution of the optical lens.

[0104] In an exemplary embodiment, the overall optical length TTL of the optical lens and the overall focal length value F of the optical lens may satisfy: TTL / F ≤ 6. In an example, 2 ≤ TTL / F ≤ 5. When the ratio of the overall optical length of the optical lens to the overall focal length value is small, the sensitivity of the optical lens is high, while when the ratio of the overall optical length of the optical lens to the overall focal length value is large, it is beneficial to achieve high resolution and low sensitivity of the optical lens. Therefore, by constraining the ratio of the overall optical length of the optical lens to the overall focal length value within a certain range, it is possible to reduce the overall optical length of the optical lens while the optical lens has high resolution and low sensitivity, and achieve miniaturization and low cost of the optical lens.

[0105] In an exemplary embodiment, the focal length value F1 of the first lens and the overall focal length value F of the optical lens may satisfy: F1 / F ≥ 2.5. Reasonably configuring the focal length value of the first lens can make the focal length value of the first lens positive, which is beneficial to converging light; at the same time, it can also make the first lens a telephoto lens, allowing more light to enter the system while enabling the light to transition smoothly to the subsequent system, achieving high resolution of the optical lens. Further, 3.5 ≤ F1 / F ≤ 10 can make the focal length value of the first lens relatively large with respect to the overall focal length value of the optical lens, which is more conducive to achieving detection at a farther distance and high resolution while ensuring more light enters the system.

[0106] In an exemplary embodiment, the focal length value F2 of the second lens and the overall focal length value F of the optical lens may satisfy: F2 / F ≤ -1. In an example, -8 ≤ F2 / F ≤ -1.3. Reasonably configuring the focal length value of the second lens is beneficial for light to enter the system smoothly, and making the focal length value of the second lens negative is beneficial for the second lens to better receive the light entering from the first lens, enabling the peripheral light entering from the first lens to transition smoothly, reducing the sensitivity of the optical lens, and improving the imaging quality of the optical lens.

[0107] In an exemplary embodiment, the focal length value F3 of the third lens and the overall focal length value F of the optical lens may satisfy: F3 / F ≤ 3. In an example, 0.8 ≤ F3 / F ≤ 2.5. Reasonably configuring the focal length value of the third lens can make the focal length value of the third lens positive, and the optical power of the third lens is relatively small, which is beneficial for the peripheral light entering from the second lens to converge quickly after passing through the third lens, improving the imaging quality of the optical lens.

[0108] In an exemplary embodiment, the focal length value F4 of the fourth lens and the overall focal length value F of the optical lens may satisfy: 1 ≤ |F4 / F| ≤ 22. In an example, 1.5 ≤ |F4 / F| ≤ 18. Reasonably configuring the focal length value of the fourth lens is beneficial for the peripheral light entering from the third lens to transition smoothly to the image plane, improving the imaging quality of the optical lens.

[0109] In an exemplary embodiment, the curvature radius R2 of the second side of the first lens and the curvature radius R3 of the first side of the second lens may satisfy: 0.4 ≤ |R2 / R3| ≤ 4.5. In an example, 0.7 ≤ |R2 / R3| ≤ 3.5. Reasonably configuring the ratio of the curvature radius of the second side of the first lens to the curvature radius of the first side of the second lens can make the curvature radii of these two surfaces relatively close, ensuring that when the light emerging from the first lens is incident on the first side of the second lens, the incident light is relatively gentle, thereby reducing the tolerance sensitivity of the optical lens.

[0110] In an exemplary embodiment, the air gap d4 between the second lens and the third lens on the optical axis and the total optical length TTL of the optical lens may satisfy: d4 / TTL ≥ 0.06. Reasonably configuring the air gap between the second lens and the third lens on the optical axis is beneficial for the light to smoothly transition from the second lens to the third lens, avoiding a sharp drop in the light, reducing the tolerance sensitivity of the optical lens; at the same time, it is also beneficial for achieving a large aperture and miniaturization of the optical lens, effectively correcting aberrations, and improving the resolution of the optical lens. Further, 0.1 ≤ d4 / TTL ≤ 0.6, while ensuring the smooth transition of light from the second lens to the third lens, it can prevent the air gap between the second lens and the third lens on the optical axis from being too large, which is more conducive to the miniaturization and low cost of the optical lens.

[0111] In an exemplary embodiment, the radius of curvature R7 of the first side of the fourth lens and the radius of curvature R8 of the second side of the fourth lens may satisfy: 0.4 ≤ |R7 / R8| ≤ 3. Reasonably configuring the ratio of the radius of curvature of the first side and the second side of the fourth lens can make the shape of the fourth lens approximate a concentric circle, which is beneficial for more light to smoothly transition, improving the light transmission ability of the optical lens and achieving a high light throughput of the optical lens. Further, 0.6 ≤ |R7 / R8| ≤ 2 makes the curvatures of the two sides of the fourth lens closer, which is more conducive to ensuring that more light smoothly transitions through the fourth lens to the rear system, further improving the light transmission ability of the optical lens and achieving a high light throughput of the optical lens.

[0112] In an exemplary embodiment, the radius of curvature R1 of the first side of the first lens and the overall focal length value F of the optical lens may satisfy: R1 / F ≤ 3. Reasonably configuring the radius of curvature of the first side of the first lens can make the first side of the first lens convex and have a relatively small radius of curvature, which is beneficial for contracting the front-end light and reducing the height of the light entering the first side of the second lens. Further, 1.2 ≤ R1 / F ≤ 2.5 is more conducive to contracting the front-end light, and thus reducing the height of the light entering the first side of the second lens.

[0113] In an exemplary embodiment, the radius of curvature R3 of the first side of the second lens and the overall focal length value F of the optical lens may satisfy: R3 / F ≤ -0.5. Reasonably configuring the radius of curvature of the first side of the second lens can make the first side of the second lens concave. The first side of the second lens collects the light emitted from the first lens and, after appropriately diverging the light, smoothly transitions the diverged light to the third lens, which is beneficial for achieving a large aperture of the optical lens. Further, -3 ≤ R3 / F ≤ -1 can make the first side of the second lens have a negative radius of curvature with a relatively small absolute value, which is more conducive to diverging the light and thus beneficial for achieving a large aperture of the optical lens.

[0114] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens and the overall focal length value F of the optical lens may satisfy: R5 / F ≤ 3. In an example, 0.6 ≤ R5 / F ≤ 2.5. By reasonably configuring the radius of curvature of the first side surface of the third lens, the first side surface of the third lens can be a convex surface and have a relatively small radius of curvature, which is beneficial for contracting the front-end light, enabling the light to converge appropriately inside the third lens, reducing the height of the light entering the fourth lens, and facilitating the realization of a small rear aperture of the optical lens.

[0115] In an exemplary embodiment, the focal length value F3 of the third lens and the focal length value F4 of the fourth lens may satisfy: |F3 / F4| < 1. In an example, 0.05 ≤ |F3 / F4| ≤ 0.95. By reasonably allocating the focal length values of the third lens and the fourth lens, the absolute value of the focal length value of the third lens can be made less than the absolute value of the focal length value of the fourth lens, so that the third lens can be used to achieve rapid convergence of light, and the fourth lens can be used to smoothly transition the light to the image plane, realizing high resolution of the optical lens.

[0116] In an exemplary embodiment, the central thickness d7 of the fourth lens on the optical axis and the optical back focal length BFL of the optical lens may satisfy: d7 / BFL ≥ 0.4. In an example, 0.6 ≤ d7 / BFL ≤ 2.5. The fourth lens is an aspherical lens. By reasonably configuring the ratio of the central thickness of the fourth lens on the optical axis to the optical back focal length of the optical lens, the fourth lens can have a relatively large central thickness, which is beneficial for balancing the optical path difference of each field of view through the fourth lens and improving the resolution of the optical lens.

[0117] In an exemplary embodiment, the radius of curvature R5 of the first side surface of the third lens and the radius of curvature R7 of the first side surface of the fourth lens may satisfy: 0.3 ≤ R5 / R7 ≤ 3. By reasonably configuring the ratio of the radii of curvature of the first side surfaces of the third lens and the fourth lens, the first side surfaces of both the third lens and the fourth lens can be convex surfaces, and the radii of curvature of these two surfaces are relatively small and close to each other, which is beneficial for the light to converge rapidly in the rear system. While realizing a small rear aperture of the optical lens, a large aperture of the optical lens can be achieved. Further, 0.5 ≤ R5 / R7 ≤ 2.5 makes the curvatures of the first side surfaces of the third lens and the fourth lens closer, which is more beneficial for the light to converge rapidly in the rear system, and thus realizes a small rear aperture of the optical lens.

[0118] In an exemplary embodiment, the optical lens may further satisfy: min(|F1|, |F2|, |F3|, |F4|) = F3, where F1 is the focal length value of the first lens, F2 is the focal length value of the second lens, F3 is the focal length value of the third lens, and F4 is the focal length value of the fourth lens. The third lens mainly plays a role in quickly converging the large-aperture light from the front in the system. By making the third lens the lens with the smallest absolute value of the focal length, it can provide a favorable guarantee for the light to smoothly enter the rear system. At the same time, the smaller the absolute value of the focal length of the third lens, the larger the light transmission amount of the optical lens.

[0119] In an exemplary embodiment, the air gap d4 between the second lens and the third lens on the optical axis and the curvature radius R4 of the second side surface of the second lens may satisfy: |d4 / R4| ≥ 0.03. Reasonably configuring the ratio of the air gap between the second lens and the third lens on the optical axis to the curvature radius of the second side surface of the second lens can make the second side surface of the second lens a concave surface and have a relatively large curvature radius, which is beneficial to controlling the smooth trend of the light between the second lens and the third lens and realizing the low sensitivity of the optical lens. Further, 0.05 ≤ |d4 / R4| ≤ 0.45. While reducing the sensitivity of the optical lens, it can avoid the air gap between the second lens and the third lens on the optical axis from being too large, which is more conducive to realizing the miniaturization and low cost of the optical lens.

[0120] In an exemplary embodiment, the air gap d2 between the first lens and the second lens on the optical axis and the air gap d4 between the second lens and the third lens on the optical axis may satisfy: d4 / d2 ≥ 0.4. The purpose of the air gap between the first lens and the second lens is to quickly collect the light into the system, and the purpose of the air gap between the second lens and the third lens is to make the light entering the system smoothly transition to the rear system. Reasonably configuring the ratio of the air gap between the second lens and the third lens on the optical axis to the air gap between the first lens and the second lens on the optical axis is beneficial to correcting the aberration caused by the large aperture of the optical lens and realizing the high resolution of the optical lens. Further, 0.6 ≤ d4 / d2 ≤ 8. While realizing the high resolution of the optical lens, it reasonably distributes the air gap between the first lens and the second lens and the air gap between the second lens and the third lens, avoiding the problem of poor imaging quality caused by one of the gaps being too large or too small, and is also beneficial to realizing the miniaturization and low cost of the optical lens.

[0121] The optical lens according to the above-described embodiments of the present application may employ multiple lenses, such as the four lenses described above. By reasonably allocating the optical parameters of each lens, miniaturization, small aperture, long focal length, short back focal length, high light throughput, high resolution, large angular resolution, and low sensitivity of the optical lens are achieved, and it can be well matched with, for example, in-vehicle chips without vignetting. The optical lens has good temperature performance, with small changes in imaging effects at high and low temperatures and stable image quality. Therefore, the optical lens according to the above-described embodiments of the present application can better meet the requirements of, for example, in-vehicle applications.

[0122] Those skilled in the art should understand that the total optical length TTL of the optical lens used above refers to the axial distance from the first side of the first lens to the imaging surface or the object source surface; the back focal length BFL of the optical lens refers to the axial distance from the second side of the fourth lens to the imaging surface or the object source surface; and the maximum field of view FOV of the optical lens is related to the image height H, which refers to the field of view corresponding to the image height H.

[0123] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although the four-lens example is described in the embodiments, the optical lens is not limited to including four lenses. If necessary, the optical lens may also include other numbers of lenses.

[0124] The following further describes specific embodiments of the optical lens applicable to the above-described embodiments with reference to the accompanying drawings.

[0125] Example 1

[0126] The following refers to Figure 1 Describe the optical lens according to Embodiment 1 of the present application.

[0127] As Figure 1 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO may be disposed between the third lens L3 and the fourth lens L4. The fourth lens L4 is an aspherical lens.

[0128] The first lens L1 has a positive optical power, its first side S1 is convex, and its second side S2 is concave.

[0129] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is concave.

[0130] The third lens L3 has a positive optical power, its first side S5 is convex, and its second side S6 is concave.

[0131] The fourth lens L4 has positive refractive power, and its first side surface S8 is convex, and its second side surface S9 is concave.

[0132] An image plane IMA is disposed on the second side of the optical lens, and a first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side surface S10 and a second side surface S11. The protective glass L6 has a first side surface S12 and a second side surface S13. When IMA is an imaging surface, light from an object sequentially passes through each surface S1 to S13 and is finally imaged on IMA. When IMA is an image source surface, light from IMA sequentially passes through each surface S13 to S1 and is finally projected on the object.

[0133] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0134]

[0135] Table 1

[0136] In Example 1, the first side surface S8 and the second side surface S9 of the fourth lens L4 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0137]

[0138] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the cone coefficient k and the high-order coefficients A4, A6, A8, A9 that can be used for each aspheric surface S8 and S9 in Example 1. 10 , A 12 and A 14 .

[0139] Face Number k A4 A6 A8 A10 A12 A14 S8 -0.5101 1.5219E-05 2.4720E-07 -3.2939E-09 3.6146E-11 -1.5086E-13 0.0000E+00 S9 3.2025 1.6071E-04 -2.7521E-07 4.3761E-08 -4.2893E-10 5.9611E-12 0.0000E+00

[0140] Table 2

[0141] Example 2

[0142] The following reference Figure 2 Describe the optical lens according to Example 2 of the present application.

[0143] like Figure 2As shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the third lens L3 and the fourth lens L4. The fourth lens L4 is an aspherical lens.

[0144] The first lens L1 has a positive optical power. Its first side S1 is convex, and its second side S2 is concave.

[0145] The second lens L2 has a negative optical power. Its first side S3 is concave, and its second side S4 is concave.

[0146] The third lens L3 has a positive optical power. Its first side S5 is convex, and its second side S6 is convex.

[0147] The fourth lens L4 has a positive optical power. Its first side S8 is convex, and its second side S9 is concave.

[0148] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0149] Table 3 shows the basic parameter table of the optical lens of Example 2, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0150]

[0151] Table 3

[0152] In Example 2, both the first side S8 and the second side S9 of the fourth lens L4 are aspherical. Table 4 gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A 10 、A 12 and A 14 .

[0153] Face Number k A4 A6 A8 A10 A12 A14 S8 -0.5139 4.6344E-05 7.1227E-07 -3.7322E-09 4.7485E-11 2.1679E-13 0.0000E+00 S9 1.5142 3.2257E-04 -3.9539E-06 7.3660E-07 -2.6845E-08 5.2684E-10 0.0000E+00

[0154] Table 4

[0155] Example 3

[0156] The following refers to Figure 3 to describe the optical lens according to Embodiment 3 of the present application.

[0157] As shown Figure 3 in the figure, the optical lens sequentially includes, from the first side to the second side along the optical axis: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the third lens L3 and the fourth lens L4. The fourth lens L4 is an aspherical lens.

[0158] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0159] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a convex surface.

[0160] The third lens L3 has a positive optical power, its first side S5 is a convex surface, and its second side S6 is a concave surface.

[0161] The fourth lens L4 has a positive optical power, its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0162] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0163] Table 5 shows the basic parameter table of the optical lens of Embodiment 3, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0164]

[0165] Table 5

[0166] In Embodiment 3, both the first side S8 and the second side S9 of the fourth lens L4 are aspherical. Table 6 gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A 10 、A 12 and A 14 for each of the aspherical surfaces S8 and S9 that can be used in Embodiment 3.

[0167] Face Number k A4 A6 A8 A10 A12 A14 S8 -0.4739 1.4551E-05 3.5070E-07 -3.7626E-09 3.4959E-11 -1.0137E-13 0.0000E+00 S9 3.2687 1.4589E-04 -4.2200E-07 3.1595E-08 2.5280E-10 -4.5146E-12 0.0000E+00

[0168] Table 6

[0169] Example 4

[0170] Refer to the following Figure 4Describe the optical lens according to Embodiment 4 of the present application.

[0171] As Figure 4 shown, the optical lens sequentially includes, from the first side to the second side along the optical axis: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The stop STO can be disposed between the third lens L3 and the fourth lens L4. The fourth lens L4 is an aspherical lens.

[0172] The first lens L1 has a positive optical power, its first side S1 is convex, and its second side S2 is concave.

[0173] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is convex.

[0174] The third lens L3 has a positive optical power, its first side S5 is convex, and its second side S6 is convex.

[0175] The fourth lens L4 has a positive optical power, its first side S8 is convex, and its second side S9 is concave.

[0176] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, the light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0177] Table 7 shows the basic parameter table of the optical lens of Embodiment 4, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0178]

[0179]

[0180] Table 7

[0181] In Embodiment 4, both the first side S8 and the second side S9 of the fourth lens L4 are aspherical. Table 8 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 for each of the aspherical surfaces S8, S9 in Embodiment 4.

[0182] Face Number k A4 A6 A8 A10 A12 A14 S8 -0.5544 2.3494E-05 4.8891E-07 -4.3337E-09 3.1542E-11 -2.8181E-14 0.0000E+00 S9 1.2522 1.4598E-04 -3.0324E-06 2.6646E-07 -7.5487E-09 8.6665E-11 0.0000E+00

[0183] Table 8

[0184] Example 5

[0185] Refer to the following Figure 5 to describe the optical lens according to Embodiment 5 of the present application.

[0186] As Figure 5 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO may be disposed between the third lens L3 and the fourth lens L4. The fourth lens L4 is an aspherical lens.

[0187] The first lens L1 has a positive focal power, its first side surface S1 is convex, and its second side surface S2 is concave.

[0188] The second lens L2 has a negative focal power, its first side surface S3 is concave, and its second side surface S4 is convex.

[0189] The third lens L3 has a positive focal power, its first side surface S5 is convex, and its second side surface S6 is concave.

[0190] The fourth lens L4 has a positive focal power, its first side surface S8 is convex, and its second side surface S9 is concave.

[0191] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side surface S10 and a second side surface S11. The protective glass L6 has a first side surface S12 and a second side surface S13. When IMA is the imaging plane, light from an object sequentially passes through each surface S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, light from IMA sequentially passes through each surface S13 to S1 and finally projects onto the object.

[0192] Table 9 shows the basic parameter table of the optical lens of Embodiment 5, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0193]

[0194]

[0195] Table 9

[0196] In Embodiment 5, both the first side surface S8 and the second side surface S9 of the fourth lens L4 are aspherical. Table 10 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 for each of the aspherical surfaces S8 and S9 that can be used in Embodiment 5.

[0197] Face Number k A4 A6 A8 A10 A12 A14 S8 -0.2669 -5.6531E-07 3.2178E-07 -6.1797E-09 6.0115E-11 -2.9678E-13 0.0000E+00 S9 3.4739 1.5421E-04 4.6720E-06 -6.0077E-07 2.5221E-08 -3.5280E-10 0.0000E+00

[0198] Table 10

[0199] Example 6

[0200] Refer to the following Figure 6 to describe the optical lens according to Embodiment 6 of the present application.

[0201] As Figure 6 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0202] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0203] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a concave surface.

[0204] The third lens L3 has a positive optical power, its first side S6 is a convex surface, and its second side S7 is a concave surface.

[0205] The fourth lens L4 has a positive optical power, its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0206] An image plane IMA is disposed on the second side of the optical lens, and a first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, the light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0207] Table 11 shows the basic parameter table of the optical lens of Embodiment 6, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0208]

[0209]

[0210] Table 11

[0211] In Embodiment 6, the first side S6 and the second side S7 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 12 gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 .

[0212] Face Number k A4 A6 A8 A10 A12 A14 S6 -0.1726 -2.7102E-06 1.5874E-09 -1.0352E-10 7.5700E-13 -2.8833E-15 0.0000E+00 S7 -1.6848 -6.2492E-07 2.1388E-08 -1.7750E-12 -1.8345E-12 3.7792E-15 0.0000E+00 S8 -0.5245 1.1325E-05 3.9588E-07 -6.2964E-09 6.4281E-11 -3.0635E-13 / S9 1.6332 1.2968E-04 -6.6456E-07 7.0874E-08 -8.4698E-10 -3.4871E-12 /

[0213] Table 12

[0214] Example 7

[0215] The following refers to Figure 7 to describe an optical lens according to Embodiment 7 of the present application.

[0216] As Figure 7 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0217] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0218] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a concave surface.

[0219] The third lens L3 has a positive optical power, its first side S6 is a convex surface, and its second side S7 is a convex surface.

[0220] The fourth lens L4 has a positive optical power, its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0221] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, the light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0222] Table 13 shows the basic parameter table of the optical lens of Embodiment 7, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0223]

[0224]

[0225] Table 13

[0226] In Example 7, the first side S6 and the second side S7 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 14 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 、A 12 and A 14 .

[0227] Face Number k A4 A6 A8 A10 A12 A14 S6 -0.2377 -7.4197E-06 6.3445E-10 -8.7017E-11 7.9921E-13 -3.3860E-15 0.0000E+00 S7 -50.4050 3.0235E-06 2.3723E-08 1.3131E-11 -1.7774E-12 3.0383E-15 0.0000E+00 S8 -0.4738 1.2974E-05 4.7438E-07 -6.5885E-09 6.0941E-11 -2.3520E-13 / S9 1.5253 1.0899E-04 -2.0832E-06 1.2208E-07 -1.3342E-09 1.3905E-12 /

[0228] Table 14

[0229] Example 8

[0230] The following refers to Figure 8 to describe the optical lens according to Example 8 of the present application.

[0231] As Figure 8 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses. The second side of the third lens L3 has an inflection point.

[0232] The first lens L1 has a positive optical power, its first side S1 is convex, and its second side S2 is concave.

[0233] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is convex.

[0234] The third lens L3 has a positive optical power, its first side S6 is convex, and its second side S7 is concave.

[0235] The fourth lens L4 has a positive optical power, its first side S8 is convex, and its second side S9 is concave.

[0236] The second side of the optical lens is provided with an image plane IMA, and a first filter L5 and a protective glass L6 are arranged between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, the light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0237] Table 15 shows the basic parameter table of the optical lens of Embodiment 8, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0238]

[0239]

[0240] Table 15

[0241] In Embodiment 8, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 16 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 .

[0242] Face Number k A4 A6 A8 A10 A12 A14 S6 -0.1766 -2.6604E-06 3.9479E-09 -1.0321E-10 6.4624E-13 -5.1065E-15 0.0000E+00 S7 2.0720 -5.3978E-07 -9.2172E-09 -2.0453E-10 -2.5288E-12 8.0591E-15 0.0000E+00 S8 -0.4739 1.4574E-05 4.6008E-07 -6.5363E-09 6.0133E-11 -2.5420E-13 / S9 1.8162 8.9970E-05 -2.5214E-07 6.6230E-08 -1.6371E-09 8.8601E-12 /

[0243] Table 16

[0244] Example 9

[0245] The following refers to Figure 9 Describe the optical lens according to Embodiment 9 of the present application.

[0246] As Figure 9 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be arranged between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0247] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0248] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a convex surface.

[0249] The third lens L3 has a positive focal power. Its first side S6 is convex, and its second side S7 is convex.

[0250] The fourth lens L4 has a positive focal power. Its first side S8 is convex, and its second side S9 is concave.

[0251] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from an object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0252] Table 17 shows the basic parameter table of the optical lens of Embodiment 9, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0253]

[0254] Table 17

[0255] In Embodiment 9, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 18 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 、A 12 and A 14 .

[0256] Face Number k A4 A6 A8 A10 A12 A14 S6 -0.0224 -1.0763E-05 1.0256E-08 -4.4445E-10 1.3101E-12 -6.5357E-15 0.0000E+00 S7 -49.2680 1.1089E-05 -1.5675E-07 -6.0060E-10 4.4614E-12 -9.5845E-15 0.0000E+00 S8 0.0413 2.2368E-05 3.3611E-08 -1.3952E-09 5.2182E-12 -1.2551E-14 / S9 1.6240 1.0514E-04 1.1409E-06 8.7127E-08 -3.5262E-09 5.1808E-11 /

[0257] Table 18

[0258] Example 10

[0259] The following refers to Figure 10 Describe the optical lens according to Embodiment 10 of the present application.

[0260] As Figure 10 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0261] The first lens L1 has a positive focal power. Its first side S1 is convex, and its second side S2 is concave.

[0262] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is convex.

[0263] The third lens L3 has a positive optical power, its first side S6 is convex, and its second side S7 is convex.

[0264] The fourth lens L4 has a positive optical power, its first side S8 is convex, and its second side S9 is concave.

[0265] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0266] Table 19 shows the basic parameter table of the optical lens of Embodiment 10, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0267]

[0268] Table 19

[0269] In Embodiment 10, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 20 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 .

[0270] Face Number k A4 A6 A8 A10 A12 A14 S6 0.0078 -1.3153E-05 3.7741E-08 -4.3874E-10 1.5329E-12 -3.9407E-15 0.0000E+00 S7 -83.7280 2.4136E-05 -1.3835E-07 -6.5317E-10 4.0898E-12 -6.7351E-15 0.0000E+00 S8 0.0980 1.7069E-05 2.7470E-07 -2.5722E-09 6.6305E-12 1.0831E-14 0.0000E+00 S9 2.1413 1.0743E-04 -2.9505E-06 3.5039E-07 -9.9599E-09 1.1720E-10 0.0000E+00

[0271] Table 20

[0272] Example 11

[0273] The following refers to Figure 11 to describe the optical lens according to Embodiment 11 of the present application.

[0274] As Figure 11 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be provided between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0275] The first lens L1 has a positive optical power, its first side S1 is convex, and its second side S2 is concave.

[0276] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is concave.

[0277] The third lens L3 has a positive optical power, its first side S6 is convex, and its second side S7 is concave.

[0278] The fourth lens L4 has a negative optical power, its first side S8 is convex, and its second side S9 is concave.

[0279] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, the light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0280] Table 21 shows the basic parameter table of the optical lens of Embodiment 11, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0281]

[0282] Table 21

[0283] In Embodiment 11, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 22 gives the conic coefficient k and the high-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 .

[0284] Face Number k A4 A6 A8 A10 A12 A14 S6 0.0708 -1.1426E-05 1.2583E-07 1.2909E-09 7.8921E-13 -1.2533E-14 0.0000E+00 S7 -211.3500 1.0850E-04 4.6422E-07 -6.8150E-10 -4.8729E-12 -2.7723E-13 0.0000E+00 S8 0.5461 8.8321E-05 2.6049E-07 -3.8823E-09 3.3060E-11 -1.2782E-12 / S9 2.8457 1.2034E-04 8.6768E-06 -4.4700E-07 1.5370E-08 -2.7525E-10 /

[0285] Table 22

[0286] Example 12

[0287] The following refers to Figure 12 Describe the optical lens according to Embodiment 12 of the present application.

[0288] As Figure 12As shown, the optical lens sequentially includes, from the first side to the second side along the optical axis: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0289] The first lens L1 has a positive focal power. Its first side S1 is convex, and its second side S2 is concave.

[0290] The second lens L2 has a negative focal power. Its first side S3 is concave, and its second side S4 is concave.

[0291] The third lens L3 has a positive focal power. Its first side S6 is convex, and its second side S7 is convex.

[0292] The fourth lens L4 has a negative focal power. Its first side S8 is convex, and its second side S9 is concave.

[0293] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0294] Table 23 shows the basic parameter table of the optical lens of Example 12, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0295]

[0296] Table 23

[0297] In Example 12, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical. Table 24 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 、A 12 and A 14 .

[0298] Face Number k A4 A6 A8 A10 A12 A14 S6 -0.1216 -2.9852E-05 9.5546E-08 8.2970E-10 -8.5645E-12 -2.9119E-14 0.0000E+00 S7 224.8400 6.2500E-05 -9.9863E-09 -2.9153E-09 -7.1899E-12 1.1024E-13 0.0000E+00 S8 0.2662 8.3582E-05 -1.5375E-07 -8.9329E-09 6.6838E-11 -1.9796E-13 / S9 2.2693 7.7422E-05 1.2073E-05 -6.9210E-07 2.1178E-08 -1.7612E-10 /

[0299] Table 24

[0300] Example 13

[0301] Refer to the followingFigure 13 Describe the optical lens according to Embodiment 13 of the present application.

[0302] As Figure 13 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses.

[0303] The first lens L1 has a positive optical power, its first side S1 is convex, and its second side S2 is concave.

[0304] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is convex.

[0305] The third lens L3 has a positive optical power, its first side S6 is convex, and its second side S7 is concave.

[0306] The fourth lens L4 has a negative optical power, its first side S8 is convex, and its second side S9 is concave.

[0307] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0308] Table 25 shows the basic parameter table of the optical lens of Embodiment 13, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0309]

[0310] Table 25

[0311] In Embodiment 13, the first side S6 and the second side S7 of the third lens L3 and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical. Table 26 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 for each of the aspherical surfaces S6 - S9 in Embodiment 13.

[0312]

[0313]

[0314] Table 26

[0315] Example 14

[0316] Refer to the following Figure 14 to describe the optical lens according to Embodiment 14 of the present application.

[0317] As Figure 14 shown, the optical lens sequentially includes, from the first side to the second side along the optical axis: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the second lens L2 and the third lens L3. Both the third lens L3 and the fourth lens L4 are aspherical lenses. The second side surface of the third lens L3 has an inflection point.

[0318] The first lens L1 has a positive optical power, its first side surface S1 is convex, and its second side surface S2 is concave.

[0319] The second lens L2 has a negative optical power, its first side surface S3 is concave, and its second side surface S4 is convex.

[0320] The third lens L3 has a positive optical power, its first side surface S6 is convex, and its second side surface S7 is convex.

[0321] The fourth lens L4 has a negative optical power, its first side surface S8 is convex, and its second side surface S9 is concave.

[0322] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side surface S10 and a second side surface S11. The protective glass L6 has a first side surface S12 and a second side surface S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, the light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0323] Table 27 shows the basic parameter table of the optical lens of Embodiment 14, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0324]

[0325] Table 27

[0326] In Embodiment 14, the first side S6 and the second side S7 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 28 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 , A 12 and A 14 for each of the aspherical surfaces S6 - S9 in Embodiment 14.

[0327]

[0328]

[0329] Table 28

[0330] Example 15

[0331] The following refers to Figure 15 the optical lens according to Embodiment 15 of the present application.

[0332] As Figure 15 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the third lens L3 and the fourth lens L4. The first lens L1, the third lens L3, and the fourth lens L4 are all aspherical lenses.

[0333] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0334] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a concave surface.

[0335] The third lens L3 has a positive optical power, its first side S5 is a convex surface, and its second side S6 is a concave surface.

[0336] The fourth lens L4 has a positive optical power, its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0337] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on IMA. When IMA is the image source plane, the light from IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0338] Table 29 shows the basic parameter table of the optical lens of Embodiment 15, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0339]

[0340] Table 29

[0341] In Embodiment 15, the first side S1 and the second side S2 of the first lens L1, the first side S5 and the second side S6 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 30 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 and A 12 .

[0342]

[0343]

[0344] Table 30

[0345] Example 16

[0346] The following refers to Figure 16 to describe the optical lens according to Embodiment 16 of the present application.

[0347] As Figure 16 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the third lens L3 and the fourth lens L4. The first lens L1 to the fourth lens L4 are all aspherical lenses.

[0348] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0349] The second lens L2 has a negative optical power, its first side S3 is a concave surface, and its second side S4 is a convex surface.

[0350] The third lens L3 has a positive optical power, its first side S5 is a convex surface, and its second side S6 is a concave surface.

[0351] The fourth lens L4 has a positive optical power, its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0352] The second side of the optical lens is provided with an image plane IMA, and a first filter L5 and a protective glass L6 are arranged between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, the light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0353] Table 31 shows the basic parameter table of the optical lens of Embodiment 16, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0354]

[0355] Table 31

[0356] In Embodiment 16, the first side S1 and the second side S2 of the first lens L1, the first side S3 and the second side S4 of the second lens L2, the first side S5 and the second side S6 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 32 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 and A 12 .

[0357]

[0358]

[0359] Table 32

[0360] Example 17

[0361] The following refers to Figure 17 to describe the optical lens according to Embodiment 17 of the present application.

[0362] As Figure 17 shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be arranged between the third lens L3 and the fourth lens L4. The first lens L1 to the fourth lens L4 are all aspherical lenses. The second side of the first lens L1 has an inflection point.

[0363] The first lens L1 has a positive optical power, its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0364] The second lens L2 has a negative optical power, its first side S3 is concave, and its second side S4 is convex.

[0365] The third lens L3 has a positive optical power, its first side S5 is convex, and its second side S6 is convex.

[0366] The fourth lens L4 has a positive optical power, its first side S8 is convex, and its second side S9 is concave.

[0367] An image plane IMA is provided on the second side of the optical lens. A first filter L5 and a protective glass L6 are provided between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0368] Table 33 shows the basic parameter table of the optical lens of Embodiment 17, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0369]

[0370] Table 33

[0371] In Embodiment 17, the first side S1 and the second side S2 of the first lens L1, the first side S3 and the second side S4 of the second lens L2, the first side S5 and the second side S6 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 34 gives the conic coefficient k and the higher-order term coefficients A4, A6, A8, A 10 and A 12 .

[0372] Face Number k A4 A6 A8 A10 A12 S1 -0.0170 4.6353E-07 1.8652E-10 -4.3373E-12 -1.8524E-14 -6.9898E-16 S2 0.0868 -7.7137E-08 1.2100E-09 -1.8524E-11 -3.0823E-13 -3.7792E-16 S3 -0.0009 -4.0955E-08 3.3537E-08 1.3533E-10 3.0815E-14 -1.4379E-15 S4 0.0061 6.5876E-06 3.0095E-08 6.3084E-11 -6.8205E-14 3.8758E-16 S5 0.0005 4.2077E-06 9.0987E-09 -3.1330E-12 -1.7238E-13 -5.8078E-16 S6 -0.5632 -4.4346E-06 -1.8075E-08 -2.3801E-11 1.8347E-14 -1.9808E-16 S8 0.2201 -1.8721E-05 4.4684E-07 -9.9877E-09 8.8727E-11 -3.7425E-13 S9 0.7504 3.6313E-04 -5.2618E-06 7.2778E-07 -2.1998E-08 3.4231E-10

[0373] Table 34

[0374] Example 18

[0375] The following refers to Figure 18 Describe the optical lens according to Embodiment 18 of the present application.

[0376] As Figure 18As shown, the optical lens sequentially includes, along the optical axis from the first side to the second side: a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The aperture stop STO can be disposed between the third lens L3 and the fourth lens L4. The first lens L1 to the fourth lens L4 are all aspherical lenses.

[0377] The first lens L1 has a positive focal power. Its first side S1 is a convex surface, and its second side S2 is a concave surface.

[0378] The second lens L2 has a negative focal power. Its first side S3 is a concave surface, and its second side S4 is a convex surface.

[0379] The third lens L3 has a positive focal power. Its first side S5 is a convex surface, and its second side S6 is a concave surface.

[0380] The fourth lens L4 has a positive focal power. Its first side S8 is a convex surface, and its second side S9 is a concave surface.

[0381] An image plane IMA is disposed on the second side of the optical lens. A first filter L5 and a protective glass L6 are disposed between the fourth lens L4 and the image plane IMA. The first filter L5 has a first side S10 and a second side S11. The protective glass L6 has a first side S12 and a second side S13. When IMA is the imaging plane, the light from the object sequentially passes through the surfaces S1 to S13 and finally forms an image on the IMA. When IMA is the image source plane, the light from the IMA sequentially passes through the surfaces S13 to S1 and finally projects onto the object.

[0382] Table 35 shows the basic parameter table of the optical lens of Embodiment 18, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0383]

[0384] Table 35

[0385] In Embodiment 18, the first side S1 and the second side S2 of the first lens L1, the first side S3 and the second side S4 of the second lens L2, the first side S5 and the second side S6 of the third lens L3, and the first side S8 and the second side S9 of the fourth lens L4 are all aspherical surfaces. Table 36 gives the conic coefficients k and the high-order term coefficients A4, A6, A8, A 10 and A 12 .

[0386] Face Number k A4 A6 A8 A10 A12 S1 -0.0923 6.1797E-08 -5.1815E-10 -1.8767E-12 3.3936E-16 -2.4238E-17 S2 0.2604 3.1970E-07 1.0202E-09 2.6466E-13 -6.2142E-14 1.8335E-16 S3 0.2765 4.4360E-06 1.6170E-09 2.0909E-11 -1.8204E-14 4.1159E-17 S4 -1.0951 -4.5892E-07 1.1012E-09 8.4688E-12 4.9943E-15 -1.1552E-17 S5 -0.0073 -2.9848E-06 2.7749E-09 -1.7723E-11 -8.4494E-14 8.6926E-17 S6 -1.2413 1.7811E-06 -4.4041E-09 -9.9884E-12 2.9722E-14 4.4496E-16 S8 -0.1603 5.3521E-06 2.2417E-07 -5.6761E-09 7.5780E-11 -4.8562E-13 S9 3.2078 1.8051E-04 3.6105E-06 -3.7613E-07 2.0345E-08 -3.1787E-10

[0387] Table 36

[0388] Table 37 shows the basic parameters of the optical lenses in Examples 1-18, such as F, FNO, ENPD, TTL, FOV, θ, H, D1, BFL, F1, F2, F3, F4, and D5.

[0389] Parameter / Example 1 2 3 4 5 6 7 8 9 F 17.713 17.432 17.699 17.814 17.450 17.815 17.893 18.235 17.858 FNO 0.900 0.900 0.900 0.900 0.700 0.900 0.900 0.900 0.900 ENPD 19.681 19.369 19.666 19.793 24.928 19.795 19.882 20.261 19.842 TTL 73.575 51.048 73.384 65.570 67.629 84.579 83.831 85.000 84.310 FOV 31.700 31.700 31.700 31.700 31.700 31.700 31.700 31.700 31.700 θ 0.553 0.553 0.553 0.553 0.553 0.553 0.553 0.553 0.553 H 9.366 9.414 9.362 9.338 9.415 9.355 9.338 9.293 9.355 D1 33.216 28.804 32.729 31.097 34.444 35.225 35.133 35.339 34.790 BFL 10.606 8.385 10.148 10.158 6.408 9.672 9.663 8.887 8.785 F1 116.752 63.823 140.762 124.517 113.888 106.975 105.345 130.721 164.044 F2 -34.445 -27.759 -47.647 -49.035 -95.775 -35.826 -35.898 -65.577 -63.994 F3 31.035 25.035 32.619 30.686 29.883 31.705 27.814 33.319 30.512 F4 42.193 37.601 44.365 52.484 52.246 54.082 89.713 50.625 87.188 D5 28.623 22.8482 27.255 26.096 28.656 29.583 28.369 24.919 25.638 Parameter / Example 10 11 12 13 14 15 16 17 18 F 17.921 17.583 17.665 17.606 17.583 17.931 17.534 17.111 17.399 FNO 0.700 1.100 1.100 0.900 0.900 0.700 0.700 0.700 0.700 ENPD 25.601 15.984 16.060 19.563 19.537 25.616 25.049 24.444 24.855 TTL 85.474 70.954 71.211 69.829 67.663 81.321 72.720 62.223 66.303 FOV 31.700 31.700 31.700 31.700 31.700 31.700 31.700 31.700 31.700 θ 0.553 0.553 0.553 0.553 0.553 0.553 0.553 0.553 0.553 H 9.334 9.403 9.392 9.387 9.385 9.343 9.409 9.471 9.450 D1 38.830 30.036 29.927 31.268 30.131 39.028 35.481 32.480 34.704 BFL 7.418 9.100 9.184 8.917 9.020 7.392 6.617 6.095 5.862 F1 153.847 112.039 111.691 122.800 121.566 115.719 137.283 92.243 116.126 F2 -67.744 -35.606 -35.809 -44.796 -44.215 -35.215 -104.774 -100.959 -110.345 F3 29.926 21.869 19.207 22.254 21.862 30.372 33.116 36.915 29.446 F4 68.590 -293.715 -64.599 -273.893 -185.172 37.642 45.457 44.878 57.072 D5 31.385 22.138 22.226 26.674 26.521 37.589 30.183 31.999 28.044

[0390] Table 37 In summary, the conditions of each example in Examples 1-18 satisfy the relationships shown in Table 38.

[0391]

[0392]

[0393] Table 38

[0394] This application also provides an electronic device, which includes the optical lens in the above exemplary embodiment and an imaging element for converting the optical image formed by the optical lens into an electrical signal. The imaging element is disposed on the imaging surface or the image source surface, and can be, for example, a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS).

[0395] The above description is only the preferred embodiment of this application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that, It sequentially includes from the first side to the second side along the optical axis: A first lens with positive optical power, whose first side is convex and second side is concave; A second lens with negative optical power, whose first side is concave; A third lens with positive optical power, whose first side is convex; and A fourth lens with optical power, whose first side is convex and second side is concave.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the maximum field of view angle FOV of the optical lens satisfy: TTL / H / tan(FOV) ≤ 20.

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

25.

4. The optical lens according to claim 1, characterized in that, The focal length value F2 of the second lens and the focal length value F3 of the third lens satisfy: 0.5 ≤ |F2 / F3| ≤ 4.

5.

5. The optical lens according to claim 1, characterized in that, The maximum clear aperture D5 of the first side of the third lens corresponding to the maximum field of view angle of the optical lens and the overall focal length value F of the optical lens satisfy: D5 / F ≥ 0.

5.

6. The optical lens according to claim 1, characterized in that, The overall focal length value F of the optical lens, the image height H corresponding to the maximum field of view angle of the optical lens, and the radian value θ of the maximum field of view angle of the optical lens satisfy: 0.4 ≤ (H / 2) / (F×tan(θ / 2)) ≤ 2.

7. The optical lens according to claim 1, characterized in that, The focal length value F1 of the first lens and the overall focal length value F of the optical lens satisfy: F1 / F ≥ 2.

5.

8. The optical lens according to claim 1, characterized in that, The radius of curvature R5 of the first side of the third lens and the radius of curvature R7 of the first side of the fourth lens satisfy: 0.3 ≤ R5 / R7 ≤ 3.

9. An optical lens, characterized in that, It sequentially includes from the first side to the second side along the optical axis: A first lens with positive optical power; A second lens with negative optical power; A third lens with positive optical power; and A fourth lens with optical power; Wherein, the focal length value F1 of the first lens and the overall focal length value F of the optical lens satisfy: F1 / F ≥ 2.

5.

10. An electronic device, characterized in that, It includes an optical lens as shown in any one of claims 1 to 9 and an imaging element for converting the optical image formed by the optical lens into an electrical signal.

Images