Optical lens

Abstract

The application provides an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a variable aperture diaphragm for adjusting an aperture size, a first lens with positive refractive power, a convex object side surface and a concave image side surface, a second lens with negative refractive power, a convex object side surface and a concave image side surface, a third lens with positive refractive power, a convex object side surface near the optical axis and a convex image side surface, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a concave object side surface and a convex image side surface, a sixth lens with negative refractive power, a convex object side surface near the optical axis and a concave image side surface near the optical axis, and a seventh lens with negative refractive power, a concave image side surface near the optical axis. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens through specific surface shape matching and reasonable refractive power distribution.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] In recent years, with the development of camera technology, electronic devices equipped with optical lenses have been used more widely, such as mobile phones, tablets, laptops, and head-mounted displays, which has led to more diverse requirements for optical lenses. To provide users with a better photography experience and enable optical lenses to capture images in different scenarios and according to specific needs, they must possess variable aperture functionality and excellent image quality.

[0003] However, the design of variable aperture and the combination of multiple lenses result in a large size of optical lens, which is difficult to meet the needs of portable and miniaturized electronic devices. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens that has one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens, consisting of seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] Variable aperture stop, used to adjust the aperture size;

[0008] The first lens with positive optical power has a convex object side and a concave image side.

[0009] A second lens with negative optical power has a convex object side and a concave image side.

[0010] A third lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is convex.

[0011] A fourth lens with negative optical power;

[0012] The fifth lens with positive optical power has a concave object side and a convex image side.

[0013] The sixth lens with negative optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0014] The seventh lens, which has negative optical power, has an image-side surface that is concave near the optical axis.

[0015] Among them, the aperture value Fno of the optical lens satisfies: 1.4 < Fno < 4.2; the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.7 < TTL / IH < 0.725.

[0016] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.3 < TTL / f < 1.38; the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.9.

[0017] Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.35.

[0018] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4 < f2 / f < -2.2.

[0019] Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.8 < f3 / f < 3.

[0020] Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -9 < f4 / f < -4.5.

[0021] Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.95 < f5 / f < 4.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -300 < f6 / f < -4; the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -2 < f7 / f < -0.8.

[0023] Further preferably, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.5 < f12 / f < 2.

[0024] Further preferably, the effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy: 0.8 < f=f345 < 1.9.

[0025] Further preferably, the effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -2.1 < f67 / f < -0.65.

[0026] Compared with existing technologies, the optical lens provided by this invention adopts a variable aperture stop and seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0029] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 3 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0032] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0033] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0034] Figure 7 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 8 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0037] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0038] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 13This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0041] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0042] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 16 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0044] Figure 17 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0045] Figure 18 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 4 of the present invention.

[0046] Figure 19 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0047] Figure 20 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0048] Figure 21 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0049] Figure 22 This is a field curvature curve diagram of the optical lens in Embodiment 5 of the present invention.

[0050] Figure 23 This is the F-Tan(θ) distortion curve of the optical lens in Embodiment 5 of the present invention.

[0051] Figure 24 This is an axial aberration curve of the optical lens in Embodiment 5 of the present invention.

[0052] Figure 25 This is a chromatic aberration curve of the optical lens in Embodiment 5 of the present invention.

[0053] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0054] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0055] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0056] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0057] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0058] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0059] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0061] The optical lens provided by the embodiment of the present invention is composed of seven lenses, which are, in order from the object side to the imaging surface along the optical axis, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0062] The optical lens provided by the embodiment of the present application further includes an aperture stop. The aperture stop is a variable-aperture diaphragm, which is used to control the amount of incident light and adjust the aperture size of the optical lens. By adjusting the distance CTst between the aperture stop and the object side surface of the first lens on the optical axis and the aperture size (opening size) of the aperture stop, the aperture stop has different states, so that the optical lens has different aperture values, realizing adjustable aperture. Specifically, the aperture stop is arranged on one side of the object side surface of the first lens, which is beneficial to adjusting the amount of incident light of the system on the light incident side of the lens and avoiding interference with other components when adjusting the aperture size and position of the aperture stop.

[0063] In some embodiments, the first lens may have a positive focal power, its object side surface is convex, and its image side surface is concave. The second lens may have a negative focal power, its object side surface is convex, and its image side surface is concave. The third lens may have a positive focal power, its object side surface is convex near the optical axis, and its image side surface is convex. The fourth lens may have a negative focal power, its object side surface may be concave or convex, and its image side surface may be concave or convex. The fifth lens may have a positive focal power, its object side surface is concave, and its image side surface is convex. The sixth lens may have a negative focal power, its object side surface is convex near the optical axis, and its image side surface is concave near the optical axis. The seventh lens may have a negative focal power, its object side surface may be concave or convex, and its image side surface is concave near the optical axis.

[0064] In some embodiments, the optical lens may further include a filter, which may be arranged between the seventh lens and the imaging surface. The filter is used to filter out interfering light and prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0065] In some embodiments, the aperture value Fno of the optical lens satisfies: 1.4 < Fno < 4.2. Meeting the above conditions enables the optical lens to have a variable aperture of F1.4 - 2.0 - 4.0, which can change the amount of incident light of the system for different application states to achieve different imaging effects.

[0066] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.7 < TTL / IH < 0.725. Meeting the above conditions can better achieve the miniaturization of the lens. At the same time, when ensuring the same total length of the lens, it has a larger image surface and can match a larger-size imaging chip to achieve high-definition imaging.

[0067] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.3 < TTL / f < 1.38. Meeting the above conditions can effectively limit the length of the lens, which is beneficial to the miniaturization of the optical lens.

[0068] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.9. Meeting the above conditions can achieve both wide-angle characteristics to meet the large-range shooting requirements and large image plane characteristics to improve the imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 1.1 < f1 / f < 1.35. Meeting the above conditions can endow the first lens with a large positive refractive power, which is beneficial to converge the light incident on the optical system from the first lens to a greater extent, facilitating the achievement of a large field angle and a large aperture of the system.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -4 < f2 / f < -2.2. Meeting the above conditions can diverge the large range of light entering the system to a certain extent, which is beneficial to avoiding excessive light deflection caused by the over-concentration of the optical power of the first lens and reducing the difficulty of aberration correction.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 1.8 < f3 / f < 3. Meeting the above conditions, by reasonably setting the focal length and surface shape of the third lens, it is beneficial to the smooth transition of light, facilitating the correction of astigmatism and field curvature, and improving the imaging quality of the optical lens.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -9 < f4 / f < -4.5. Meeting the above conditions is beneficial to diverging the light converged by the third lens, balancing the aberration of the optical lens, and improving the imaging quality of the optical lens.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.95 < f5 / f < 4. Meeting the above conditions is beneficial to converging the diverging light to the rear optical system, shortening the optical path of the peripheral light reaching the imaging surface, effectively shortening the total length, and improving the resolution quality at the same time. [[ID=十九]]

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -300 < f6 / f < -4; the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -2 < f7 / f < -0.8. Meeting the above conditions is beneficial to diverging the incident light, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, and better achieving large target surface imaging of the lens.

[0075] In some embodiments, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy: 1.5 < f12 / f < 2. Meeting the above conditions is beneficial to the convergence of light, enabling the light entering the system from the front end to smoothly enter the rear optical system, making the overall optical path more gentle, optimizing aberration, and improving resolution.

[0076] In some embodiments, the effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens, and the fifth lens satisfy: 0.8 < f345 / f < 1.9. Meeting the above conditions is beneficial for the light to enter the subsequent system more gently and reduces the tolerance sensitivity of the optical lens.

[0077] In some embodiments, the effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy: -2.1 < f67 / f < -0.65. Meeting the above conditions can diverge the incident light to a certain extent, causing the peripheral light and the central light to turn upwards, reaching a higher imaging position, and thus achieving large target surface imaging of the lens.

[0078] In some embodiments, the effective focal length f of the optical lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 0.5 < R11 / f < 1; the effective focal length f of the optical lens and the curvature radius R12 of the image side surface of the sixth lens satisfy: 0.4 < R12 / f < 0.8. Meeting the above conditions, by making the sixth lens adopt a convex-concave surface type design, the transmittance of light is improved, and it can be better paired with the seventh lens to correct aberration and improve the overall imaging quality.

[0079] In some embodiments, the effective focal length f of the optical lens and the curvature radius R14 of the image side surface of the seventh lens satisfy: 0.3 < R14 / f < 0.65. Meeting the above conditions, restricting the image side surface of the seventh lens to be concave is beneficial to increasing the imaging area and the field angle of the optical lens, beneficial to balancing the aberration of the optical lens, and improving the imaging quality of the optical lens.

[0080] In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: -0.5 < f1 / f2 < -0.3. Meeting the above conditions can effectively converge a wide range of light entering the system, and at the same time is beneficial for the backend optical system to correct large-angle aberrations, thereby achieving the balance of miniaturization and high pixel count of the optical lens.

[0081] In some embodiments, the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy: -0.5 < f3 / f4 < -0.25. Meeting the above conditions is beneficial for the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0082] In some embodiments, the focal length f5 of the fifth lens and the focal length f6 of the sixth lens satisfy: -0.25 < f5 / f6 < -0.01. Meeting the above conditions is beneficial for the smooth transition of light, and at the same time corrects various aberrations of the optical lens, improving the imaging quality of the optical lens.

[0083] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens, the maximum aperture value Fno of the optical lens and the minimum aperture value Fno of the optical lens min satisfy: 4.8mm < IH / (Fno max - Fno min ) < 4.9mm. Meeting the above conditions enables the optical lens to have a relatively large image plane, and at the same time the aperture value of the lens is maintained within a reasonable range, achieving the effect of high pixel count and adjustable aperture of the lens.

[0084] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 2.7 < IH / EPD < 7.6. Meeting the above conditions enables the lens to have a relatively large image plane while having a relatively large adjustable range of the aperture, achieving the balance of a large target surface and adjustable aperture.

[0085] In some embodiments, the optical lens satisfies the conditional formula: 6.5mm < f < 6.65mm, 1.6mm < EPD < 4.5mm, 8.6mm < TTL < 8.85mm, 80° < FOV < 90°, 12mm < IH < 12.5mm; where f represents the effective focal length of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, FOV represents the maximum field angle of the optical lens, and IH represents the true image height corresponding to the maximum field angle of the optical lens. Meeting the above conditions indicates that the optical lens provided by the embodiments of the present invention at least has the characteristics of adjustable entrance pupil diameter, miniaturization, large field angle, etc.

[0086] ​In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Conversely, when the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical system. The lenses in the optical lens provided by the present invention are all plastic lenses.

[0087] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first, second, third, fourth, fifth, sixth, and seventh lenses of this invention can all be aspherical lenses, which can effectively reduce the aberrations of the optical lens, thereby reducing the number of lenses and their size, and better achieving lens miniaturization.

[0088] In various embodiments of the present invention, when an aspherical lens is used, the surface shape of the aspherical lens satisfies the following equation:

[0089]

[0090] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis, c is the paraxial curvature of the surface, k is the quadratic surface coefficient, and A 2i is the aspherical surface shape coefficient of the 2ith order.

[0091] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0092] Example 1

[0093] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging surface S17, the following components in sequence: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.

[0094] Among them, the first lens L1 has positive optical power, its object side S1 is convex, and its image side S2 is concave.

[0095] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0096] The third lens L3 has positive optical power, its object side S5 is convex near the optical axis, and its image side S6 is convex.

[0097] The fourth lens L4 has negative optical power, its object side S7 is concave, and its image side S8 is concave near the optical axis.

[0098] The fifth lens L5 has positive optical power, its object side S9 is concave, and its image side S10 is convex.

[0099] The sixth lens L6 has negative optical power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0100] The seventh lens L7 has negative optical power. Its object-side surface S13 is convex near the optical axis, and its image-side surface S14 is concave near the optical axis.

[0101] The object-side surface S15 and the image-side surface S16 of filter G1 are both planar.

[0102] The imaging plane S17 is a plane.

[0103] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all made of plastic aspherical lenses.

[0104] The stop ST is a variable aperture stop, located on the object side of the first lens L1, used to control the amount of light entering and adjust the aperture size of the optical lens. By adjusting the distance CTst between the stop and the object side of the first lens on the optical axis, and the opening size of the stop ST, the stop ST can be made to have different states, thereby allowing the optical lens to have different aperture values.

[0105] Specifically, in this embodiment, the distance CTst between the aperture stop and the object-side surface of the first lens on the optical axis is adjustable from -0.945 to 0.300 mm, the EPD range is 1.642 to 4.467 mm, and the Fno range is 1.47 to 4.0. As shown in Tables 1-3, the optical lens 100 can have different aperture values ​​when the aperture ST is in three different states. It is understood that the aperture stop ST includes, but is not limited to, these three states.

[0106] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0107] Table 1-1

[0108]

[0109] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0110] Table 1-2

[0111]

[0112]

[0113] The parameters of the optical lens 100 in Example 1 under different aperture conditions are shown in Tables 1-3.

[0114] Table 1-3

[0115] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.470 2.000 4.000 CTst(mm) -0.945 0.300 0.300 EPD (mm) 4.467 3.283 1.642

[0116] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the degree of curvature of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the field curvature of the meridional and sagittal image planes is controlled within ±0.2 mm, indicating that the optical lens 100 can correct the field curvature well.

[0117] Figure 3 The F-Tan(θ) distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion at different field-of-view angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the distortion value is controlled within 0 to 2%, indicating that the optical lens 100 can correct distortion well.

[0118] Figure 4 The diagram shows the axial aberration curve of the optical lens 100 in this embodiment, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.04 mm, indicating that the optical lens 100 can correct axial aberration well.

[0119] Figure 5The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents the chromatic aberration of each wavelength relative to the center wavelength (0.51 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the figure, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1 μm, indicating that the optical lens 100 can effectively correct chromatic aberration.

[0120] Example 2

[0121] Please see Figure 6 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0122] In this embodiment, the distance CTst between the aperture stop and the object side surface of the first lens on the optical axis is adjustable from -0.879 to 0.300 mm, the EPD range is 1.636 to 4.453 mm, and the Fno range is 1.47 to 4.0. As shown in Table 2-3, the optical lens 200 can have different aperture values ​​when the aperture ST is in three different states. It can be understood that the aperture stop ST includes, but is not limited to, these three states.

[0123] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0124] Table 2-1

[0125]

[0126]

[0127] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0128] Table 2-2

[0129]

[0130] The parameters of the optical lens 200 in Example 2 under different aperture conditions are shown in Table 2-3.

[0131] Table 2-3

[0132]

[0133]

[0134] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0135] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.3mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0136] from Figure 8 As can be seen, the distortion value is controlled within 0-3%, indicating that the optical lens 200 can correct distortion well.

[0137] from Figure 9 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens 200 can correct axial aberration well.

[0138] from Figure 10 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0139] Example 3

[0140] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S7 of the fourth lens L4 is convex near the optical axis; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0141] In this embodiment, the distance CTst between the aperture stop and the object side surface of the first lens on the optical axis is adjustable from -0.624 to 0.300 mm, the EPD range is 1.649 to 4.488 mm, and the Fno range is 1.47 to 4.0. As shown in Table 3-3, the optical lens 300 can have different aperture values ​​when the aperture ST is in three different states. It can be understood that the aperture stop ST includes, but is not limited to, these three states.

[0142] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0143] Table 3-1

[0144]

[0145]

[0146] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0147] Table 3-2

[0148]

[0149]

[0150] The parameters of the optical lens 300 in Example 3 under different aperture conditions are shown in Table 3-3.

[0151] Table 3-3

[0152] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.470 2.000 4.000 CTst(mm) -0.624 0.030 0.030 EPD (mm) 4.488 3.299 1.649

[0153] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0154] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.2mm, indicating that the optical lens 300 can effectively correct field curvature.

[0155] from Figure 13 As can be seen, the distortion value is controlled within 0-2%, indicating that the optical lens 300 can correct distortion well.

[0156] from Figure 14 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens 300 can correct axial aberration well.

[0157] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±2μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0158] Example 4

[0159] Please see Figure 16 The figure shown is a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0160] In this embodiment, the distance CTst between the aperture stop and the object-side surface of the first lens on the optical axis is adjustable from -0.84 to 0.300 mm, the EPD range is 1.638 to 4.457 mm, and the Fno range is 1.47 to 4.0. As shown in Table 4-3, the optical lens 400 can have different aperture values ​​when the aperture ST is in three different states. It can be understood that the aperture stop ST includes, but is not limited to, these three states.

[0161] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0162] Table 4-1

[0163]

[0164]

[0165] The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0166] Table 4-2

[0167]

[0168]

[0169] The parameters of the optical lens 400 in Example 4 under different aperture conditions are shown in Table 4-3.

[0170] Table 4-3

[0171] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.470 2.000 4.000 CTst(mm) -0.840 0.300 0.300 EPD (mm) 4.457 3.276 1.638

[0172] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown.

[0173] from Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.2mm, indicating that the optical lens 400 can effectively correct field curvature.

[0174] from Figure 18 As can be seen, the distortion value is controlled within 0-2%, indicating that the optical lens 400 can correct distortion well.

[0175] from Figure 19 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens 400 can correct axial aberration well.

[0176] from Figure 20 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0177] Example 5

[0178] Please see Figure 21 The figure shows a schematic diagram of the structure of the optical lens 500 provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side S8 of the fourth lens L4 is a convex surface; the object side S13 of the seventh lens L7 is a concave surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0179] In this embodiment, the distance CTst between the aperture stop and the object-side surface of the first lens on the optical axis is adjustable from -0.953 to 0.300 mm, the EPD range is 1.650 to 4.489 mm, and the Fno range is 1.47 to 4.0. As shown in Table 5-3, the optical lens 500 can have different aperture values ​​when the aperture ST is in three different states. It can be understood that the aperture stop ST includes, but is not limited to, these three states.

[0180] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0181] Table 5-1

[0182]

[0183] The surface profile parameters of the aspherical lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0184] Table 5-2

[0185]

[0186]

[0187] The parameters of the optical lens 500 in Example 5 under different aperture conditions are shown in Table 5-3.

[0188] Table 5-3

[0189] Variable aperture First aperture state Second aperture state Third aperture state Fno 1.470 2.000 4.000 CTst(mm) -0.953 0.300 0.300 EPD (mm) 4.489 3.299 1.650

[0190] In this embodiment, the field curvature curve, F-Tan(θ) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 500 are respectively as follows: Figure 22 , Figure 23 , Figure 24 , Figure 25 As shown.

[0191] from Figure 22 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.2mm, indicating that the optical lens 500 can correct the field curvature well.

[0192] from Figure 23 As can be seen, the distortion value is controlled within 0-2%, indicating that the optical lens 500 can correct distortion well.

[0193] from Figure 24 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens 500 can correct axial aberration well.

[0194] from Figure 25 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 500 can correct chromatic aberration well.

[0195] Please refer to Table 6 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0196] Table 6

[0197] Parameters and conditional expressions Example 1 Example 2 Example 3 Example 4 Example 5 f(mm) 6.566 6.546 6.590 6.550 6.590 FOV (°) 85.000 85.000 85.000 85.000 85.000 EPD (mm) 1.642～4.467 1.636～4.453 1.649～4.488 1.638～4.457 1.650～4.489 TTL(mm) 8.790 8.790 8.659 8.790 8.790 Fno 1.47～4.0 1.47～4.0 1.47～4.0 1.47～4.0 1.47～4.0 IH(mm) 12.255 12.268 12.306 12.246 12.262 CRA(°) 38.082 37.189 37.800 37.290 36.850 TTL / f 1.339 1.343 1.314 1.342 1.334 IH / f 1.866 1.874 1.867 1.870 1.861 TTL / IH 0.717 0.717 0.704 0.718 0.717 f1 / f 1.205 1.265 1.161 1.270 1.245 f2 / f -3.722 -3.168 -2.460 -3.540 -3.153 f3 / f 2.720 2.698 2.023 2.029 2.351 f4 / f -6.512 -8.049 -5.788 -4.955 -8.182 f5 / f 1.116 1.074 3.658 1.634 1.579 f6 / f -5.716 -4.521 -291.587 -6.979 -8.668 f7 / f -0.889 -0.970 -1.848 -1.231 -0.964 R11 / f 0.802 0.589 0.566 0.763 0.917 R12 / f 0.632 0.462 0.525 0.621 0.738 R14 / f 0.477 0.374 0.492 0.355 0.587 f1 / f2 -0.324 -0.399 -0.472 -0.359 -0.395 f3 / f4 -0.418 -0.335 -0.349 -0.409 -0.287 f5 / f6 -0.195 -0.238 -0.013 -0.234 -0.182 <![CDATA[IH / (Fno max -Fno min )(mm)]]> 4.844 4.849 4.864 4.840 4.847 IH / EPD 2.743～7.463 2.755～7.499 2.742～7.463 2.748～7.476 2.732～7.432 f12 / f 1.610 1.859 1.843 1.771 1.800 f345 / f 0.965 0.929 1.754 1.195 1.153 f67 / f -0.778 -0.802 -1.969 -1.059 -0.898

[0198] In summary, the optical lens provided by the present invention employs a variable aperture stop and seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large aperture, adjustable aperture, large target surface, and miniaturization.

[0199] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0200] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens consisting of seven pieces of lenses, characterized in that, In order from the object side to the imaging plane along the optical axis, the optical lens comprises in sequence: a variable aperture stop for adjusting the aperture size; a first lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with positive refractive power, the object side surface of which is convex at the near optical axis, and the image side surface of which is convex; a fourth lens with negative refractive power; a fifth lens with positive refractive power, the object side surface of which is concave, and the image side surface of which is convex; a sixth lens with negative refractive power, the object side surface of which is convex at the near optical axis, and the image side surface of which is concave at the near optical axis; a seventh lens with negative refractive power, the image side surface of which is concave at the near optical axis; wherein the optical lens has an aperture value Fno satisfying 1.4 < Fno < 4.2; the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens satisfy 0.7 < TTL / IH < 0.725; the real image height IH corresponding to the maximum field angle of the optical lens satisfies 12 mm < IH < 12.5 mm; the real image height IH corresponding to the maximum field angle of the optical lens, the maximum aperture value Fnomax of the optical lens, and the minimum aperture value Fnomin of the optical lens satisfy 4.8 mm < IH / (Fnomax-Fnomin) < 4.9 mm.

2. The optical lens of claim 1, wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.3 < TTL / f < 1.38; the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy 1.8 < IH / f < 1.

9.

3. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy 1.1 < f1 / f < 1.

35.

4. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy -4 < f2 / f < -2.

2.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy 1.8 < f3 / f < 3.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy -9 < f4 / f < -4.

5.

7. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy 0.95 < f5 / f < 4.

8. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy -300 < f6 / f < -4; the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy -2 < f7 / f < -0.

8.

9. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f12 of the first lens and the second lens satisfy 1.5 < f12 / f < 2.

10. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f345 of the third lens, the fourth lens and the fifth lens satisfy 0.8 < f345 / f < 1.

9.

11. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f67 of the sixth lens and the seventh lens satisfy -2.1 < f67 / f < -0.65.

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