A zoom optical lens and a terminal device

Abstract

The present application discloses an optical lens and a terminal device, relating to the technical field of electronic devices. The optical lens sequentially includes a light guiding element, a first lens group, a second lens group, and a third lens group from the object side to the image side; the light guiding element includes a light incident surface, a reflecting surface, and a light emitting surface facing the first lens group. The light on the object side enters from the light incident surface, is reflected by the reflecting surface, and then enters the first lens group, the second lens group, and the third lens group in sequence through the light emitting surface; the first lens group includes a first lens and a second lens; the second lens group includes a third lens, a fourth lens, and a fifth lens; the third lens group includes a sixth lens and a seventh lens; the optical lens satisfies the relational expression: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3. This enables the optical lens to reach an optimal balance state during the zooming process, facilitating the achievement of a larger zoom ratio, improving both the imaging quality and shortening the total length of the optical lens.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and in particular, to a zoom optical lens and a terminal device. Background Art

[0002] Currently, with the rapid development of electronic terminal products, in order to obtain good captured images under different shooting distances, electronic terminal products such as mobile phones are generally equipped with multiple cameras such as wide-angle zoom, standard zoom, and telephoto zoom, and combined with electronic magnification technology to achieve a continuous zoom process. In the prior art, a fixed lens group, a zoom lens group, a compensation lens group, and an aberration stabilization lens group are usually used to meet the shooting zoom requirements, but while meeting the requirements of shooting imaging quality, the requirement of thinning cannot be met, which is not conducive to the thinning of electronic terminal products such as mobile phones. Summary of the Invention

[0003] In view of this, the purpose of this application is to overcome the deficiencies in the prior art. This application provides an optical continuous zoom lens with good imaging quality and thin and light characteristics.

[0004] In a first aspect, this application provides:

[0005] A zoom optical lens, which sequentially includes a light guiding element, a first lens group, a second lens group, and a third lens group from the object side to the image side;

[0006] The light guiding element includes a light incident surface, a reflecting surface, and a light emitting surface facing the first lens group. The light on the object side enters from the light incident surface, is reflected by the reflecting surface, and then sequentially enters the first lens group, the second lens group, and the third lens group through the light emitting surface;

[0007] The first lens group includes a first lens and a second lens;

[0008] The second lens group includes a third lens, a fourth lens, and a fifth lens;

[0009] The third lens group includes a sixth lens and a seventh lens;

[0010] The optical lens satisfies the relational expression: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3, where R2 is the curvature radius of the image side surface of the first lens, R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and R10 is the curvature radius of the image side surface of the fifth lens.

[0011] In some embodiments of this application, the optical lens satisfies: , where is the optical zoom ratio, is the focal length when the optical lens is at a long focal length, is the focal length when the optical lens is at a short focal length.

[0012] In some embodiments of the present application, the optical lens satisfies: TTL / ≤1.1, where TTL is the overall optical length of the optical lens, is the focal length when the optical lens is at a long focal length.

[0013] In some embodiments of the present application, the first lens group has a negative refractive power; the second lens group has a positive refractive power; the third lens group has a negative refractive power.

[0014] In some embodiments of the present application, the first lens and the second lens are relatively fixed; the third lens, the fourth lens, and the fifth lens are relatively fixed; the sixth lens and the seventh lens are relatively fixed.

[0015] In some embodiments of the present application, the image side and the object side of the first lens are both concave surfaces, the image side of the second lens is a concave surface, and the object side of the second lens is a convex surface; the image side of the third lens is a convex surface, the object sides of the fourth lens and the fifth lens are concave surfaces, and the image sides of the third lens, the fourth lens, and the fifth lens are all convex surfaces; the object sides of the sixth lens and the seventh lens are concave surfaces, and the image sides of the sixth lens and the seventh lens are convex surfaces.

[0016] In some embodiments of the present application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses.

[0017] In some embodiments of the present application, any two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are made of glass, and the remaining five lenses are made of plastic; or any three of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are made of glass, and the remaining four lenses are made of plastic.

[0018] In some embodiments of the present application, during the process of the optical lens changing from the short focal length state to the long focal length state, the distance between the first lens group and the second lens group gradually decreases, and the distance between the third lens group and the imaging surface gradually increases.

[0019] In some embodiments of the present application, the first lens group and the second lens group move in a linear manner, and the third lens group and the imaging surface move in a non-linear manner; or the first lens group and the second lens group move in a non-linear manner, and the third lens group and the imaging surface move in a linear manner.

[0020] In some embodiments of the present application, the optical lens satisfies: 3 ≤ FNO ≤ 5, where FNO is the aperture value of the optical lens.

[0021] In some embodiments of the present application, the maximum distance between the image side of the sixth lens and the object side of the seventh lens is d, satisfying the relationship: 0 ≤ d ≤ 3 mm.

[0022] In some embodiments of the present application, the light guiding element is a prism, and both the light incident surface and the light exiting surface of the prism are spherical surfaces.

[0023] In a second aspect, the present application further provides a terminal device, including the zoom optical lens described in any of the above embodiments.

[0024] The beneficial effects of the present application are as follows: The present application proposes a zoom optical lens. After the light in the object side direction is turned by the light guiding element, it is sequentially incident into the first lens group, the second lens group, and the third lens group. When the relationship: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3 is satisfied, the optical lens reaches the best balance state during the zooming process, which is beneficial to achieving a large zoom ratio. It can not only improve the imaging quality but also shorten the total length of the optical lens and reduce the volume of the optical lens. Such a structural design enables the optical lens to meet the requirements of the thin and light of the terminal device when applied to the terminal device, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Schematic diagram of the optical path of the optical lens in some embodiments of the present application;

[0027] Figure 2 Schematic diagram of the optical path of the optical lens in the first embodiment of the present application;

[0028] Figure 3 Schematic diagram showing the astigmatism curve and distortion curve in the first embodiment of the present application;

[0029] Figure 4 Shows the schematic diagram of the chromatic spherical aberration curve of the first embodiment of the present application;

[0030] Figure 5 Shows the schematic diagram of the optical path of the optical lens of the second embodiment of the present application;

[0031] Figure 6 Shows the schematic diagrams of the astigmatism curve and the distortion curve of the second embodiment of the present application;

[0032] Figure 7 Shows the schematic diagram of the chromatic spherical aberration curve of the second embodiment of the present application;

[0033] Figure 8 Shows the schematic diagram of the optical path of the optical lens of the third embodiment of the present application;

[0034] Figure 9 Shows the schematic diagrams of the astigmatism curve and the distortion curve of the third embodiment of the present application;

[0035] Figure 10 Shows the schematic diagram of the optical path of the optical lens of the fourth embodiment of the present application;

[0036] Figure 11 Shows the schematic diagrams of the astigmatism curve and the distortion curve of the fourth embodiment of the present application;

[0037] Figure 12 Shows the schematic diagram of the chromatic spherical aberration curve of the fourth embodiment of the present application;

[0038] Figure 13 Shows the schematic diagram of the optical path of the optical lens of the fifth embodiment of the present application;

[0039] Figure 14 Shows the schematic diagrams of the astigmatism curve and the distortion curve of the fifth embodiment of the present application;

[0040] Figure 15 Shows the schematic diagram of the chromatic spherical aberration curve of the fifth embodiment of the present application.

[0041] Description of the main element symbols: 100 - optical lens; 10 - prism; 11 - incident light surface; 12 - reflecting surface; 13 - outgoing light surface; 20 - first lens group; 21 - first lens; 22 - second lens; 30 - second lens group; 31 - third lens; 32 - fourth lens; 33 - fifth lens; 40 - third lens group; 41 - sixth lens; 42 - seventh lens; 50 - optical axis; 60 - imaging surface. Detailed implementation manners

[0042] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0044] Generally speaking, the lens module of a terminal device adopts a 4-group lens group or a 5-to-9-lens structure design, which can achieve a focal length of 2 to 5 times. In order to obtain high-quality image quality, a sufficiently large optical space is required to balance different aberrations, including chromatic aberration and monochromatic aberrations (including astigmatism, distortion, spherical aberration, etc.). A large optical space is contrary to the requirement of thinning the lens module, which is not conducive to the thinning of electronic terminal products such as mobile phones.

[0045] To solve the above problems, embodiments of the present application provide an optical lens and a terminal device. The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0046] Embodiments of the present application relate to an optical lens and a terminal device. The optical lens is a zoom lens for a terminal device for daily use. The terminal device may be a smart phone, a tablet computer, various wearable devices, a virtual reality (VR) device, a monitoring device, a vehicle-mounted device, a smart home, or other devices with a camera function.

[0047] The following briefly explains the concepts involved in the above embodiments:

[0048] Lens: A component that uses the refraction principle of a lens to allow the light of a scene to pass through the lens and form a clear image on the focal plane.

[0049] Aberration: In a lens, it refers to the deviation between the result obtained from the non-paraxial ray tracing and that from the paraxial ray tracing, which is the deviation from the ideal situation of Gaussian optics (first-order approximation theory or paraxial rays). Aberrations are divided into two major categories: chromatic aberration and monochromatic aberration. Chromatic aberration occurs because the refractive index of the lens material is a function of wavelength. When light of different wavelengths passes through the lens, dispersion occurs due to different refractive indices. The dispersion where the refractive index of light decreases as the wavelength increases can be called normal dispersion, while the dispersion where the refractive index increases as the wavelength increases can be called negative dispersion (or anomalous dispersion). Monochromatic aberration refers to the aberration that occurs even with highly monochromatic light. According to the resulting effects, monochromatic aberration can be further divided into two categories: "blurring the image" and "distorting the image". The former includes spherical aberration, astigmatism, etc., and the latter includes field curvature, distortion, etc. Chromatic aberration includes axial chromatic aberration and lateral chromatic aberration. Axial chromatic aberration means that along the optical axis, because the lens has different refractive indices for light of different wavelengths, the focal points of different colors of light are different.

[0050] Focal length: The distance from the principal plane of the lens to the corresponding focal point.

[0051] Effective Focal Length (EFL): For a thick lens (a lens whose thickness cannot be ignored) or an optical lens with several lenses or mirrors, the focal length is usually expressed as the effective focal length to distinguish it from the commonly used parameters.

[0052] Total Track Length (TTL) of the lens: The total track length refers to the distance from the first surface of the lens element in the lens to the image plane.

[0053] Refractive power: It can also be called diopter or focal power, which is the unit for measuring the refractive ability of a lens or a curved mirror. The refractive power is equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, which characterizes the ability of the lens to deflect light. If the refractive power is positive, the lens has a converging effect, such as a convex lens. If the refractive power is negative, the lens has a diverging effect, such as a concave lens.

[0054] Field of view: It refers to the area on the screen of the terminal device where the object being photographed can be seen.

[0055] Object side: The side of the lens closest to the object being photographed is the object side.

[0056] Image side: The side of the lens closest to the imaging side is the image side.

[0057] As Figure 1 shown, the zoom optical lens 100 provided by the embodiment of the present application includes a light guiding element, a first lens group 20, a second lens group 30, and a third lens group 40 in sequence from the object side to the image side.

[0058] The light guiding element includes a light incident surface 11, a reflecting surface 12, and a light emitting surface 13 facing the first lens group 20. The light on the object side enters from the light incident surface 11, is reflected by the reflecting surface 12, and then enters the first lens group 20, the second lens group 30, and the third lens group 40 in sequence through the light emitting surface 13.

[0059] Specifically, the first lens group 20 includes a first lens 21 and a second lens 22. The second lens group 30 includes a third lens 31, a fourth lens 32, and a fifth lens 33. The third lens group 40 includes a sixth lens 41 and a seventh lens 42.

[0060] It can be understood that the order of arrangement from the object side to the image side is: a light guiding element, the first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42. Among them, for example, the light guiding element and the first lens group 20 are set as a fixed group, the second lens group 30 is a variable magnification group, and the third lens group 40 is a compensation group. The zoom optical lens 100 satisfies the relational expression: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3, where R2 is the curvature radius of the image side surface of the first lens 21, R5 is the curvature radius of the object side surface of the third lens 31, R6 is the curvature radius of the image side surface of the third lens 31, and R10 is the curvature radius of the image side surface of the fifth lens 33. Under the condition of satisfying the above relational expression, the zoom optical lens 100 reaches an optimal balance state during the zooming process, which is beneficial to achieving a larger magnification ratio, improving the imaging quality, shortening the total length of the zoom optical lens 100, and reducing the volume of the zoom optical lens 100. Such a structural design enables the zoom optical lens 100 to meet the requirements of thinning of the terminal device when applied to the terminal device, and the structure is simple.

[0061] In some embodiments of the present application, optionally, the first lens group 20 has a negative refractive power, and the image side surfaces of the first lens 21 and the second lens 22 are concave surfaces, so that it has a diverging effect. The second lens group 30 has a positive refractive power, and the image side surfaces of the third lens 31, the fourth lens 32, and the fifth lens 33 are all convex surfaces, so that it has a converging effect. By focusing the light, the total length of the zoom optical lens 100 can be shortened, thereby reducing the volume of the zoom optical lens 100. The third lens group 40 has a negative refractive power. Through the surface types and refractive powers of the respective lenses, the zoom optical lens 100 can meet the requirements of high pixels and good imaging effects.

[0062] In some embodiments of the present application, optionally, the first lens 21 and the second lens 22 are relatively fixed, and at the same time, the first lens group 20 can be set as a fixed group. The third lens 31, the fourth lens 32, and the fifth lens 33 are relatively fixed, and the third lens group 40 can be set as a zoom group to achieve overall movement during the zooming process. The sixth lens 41 and the seventh lens 42 are relatively fixed. Specifically, according to needs, a preset distance can be designed between the sixth lens 41 and the seventh lens 42. For example, the image side of the sixth lens 41 is designed to be in contact with the object side of the seventh lens 42, or the distance between the image side of the sixth lens 41 and the object side of the seventh lens 42 can be designed as a preset distance, such as 2 mm. At the same time, the third lens group 40 can be set as a compensation group.

[0063] It can be understood that a preset distance is designed between the sixth lens 41 and the seventh lens 42, so that the maximum distance between the image side of the sixth lens 41 and the object side of the seventh lens 42 is d, satisfying the relationship: 0 ≤ d ≤ 3 mm.

[0064] In the above embodiments, by setting the first lens group 20, the second lens group 30, and the third lens group 40, during the process of the zoom optical lens 100 changing from the short focal state to the long focal state, the distance between the first lens group 20 and the second lens group 30 is controlled to gradually decrease, and the distance between the third lens group 40 and the imaging surface is gradually increased. Among them, during the process of changing from the short focal state to the long focal state, the first lens group 20 and the second lens group 30 can move in a linear manner to achieve a gradual decrease in the distance between the first lens group 20 and the second lens group 30. The third lens group 40 and the imaging surface move in a non-linear manner to achieve a gradual increase in the distance between the third lens group 40 and the imaging surface.

[0065] Of course, it is also possible to move the first lens group 20 and the second lens group 30 in a non-linear manner to achieve a gradual decrease in the distance between the first lens group 20 and the second lens group 30. The third lens group 40 and the imaging surface move in a linear manner to achieve a gradual increase in the distance between the third lens group 40 and the imaging surface. During the process of changing from the short focal state to the long focal state, the focal length is kept continuously changing, so that during the transformation process, the imaging quality of the optical lens meets the requirements of high-definition imaging.

[0066] At the same time, in order to ensure high-definition imaging quality, when satisfying the relationship: 1.5 ≤ ︱(R6 + R10) / (R2 + R5) ︱ ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3, the optical lens also satisfies: TTL / ≤ 1.1, where, 。Thus, the zoom optical lens 100 can reach the best balance state during the zooming process, which is beneficial to achieving a large zoom ratio. It can not only ensure the imaging quality but also shorten the total length of the zoom optical lens 100, thereby thinning the zoom optical lens 100. As Figure 1 shown, in some embodiments of the present application, the image side and the object side of the first lens 21 are both concave surfaces, the image side of the second lens 22 is a concave surface, and the object side of the second lens 22 is a convex surface; the image side of the third lens 31 is a convex surface, the object sides of the fourth lens 32 and the fifth lens 33 are concave surfaces, and the image sides of the third lens 31, the fourth lens 32, and the fifth lens 33 are all convex surfaces; the object sides of the sixth lens 41 and the seventh lens 42 are concave surfaces, and the image sides of the sixth lens 41 and the seventh lens 42 are convex surfaces. Through the surface type design of each lens, it has corresponding refractive power, which can ensure the imaging effect with high pixels.

[0067] In some embodiments of the present application, specifically, the first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are all aspherical lenses.

[0068] In any of the above embodiments of the present application, optionally, any two of the first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are made of glass, and the remaining five lenses are made of plastic. For example, the third lens 31 and the fifth lens 33 are made of glass, and the remaining lenses are made of plastic. Such a design is beneficial to saving the cost of the zoom optical lens 100.

[0069] It can be understood that the first lens 21 and the sixth lens 41 can also be designed to be made of glass, and the remaining lenses are made of plastic. Specifically, two lenses can be selected to be made of glass according to needs, and the remaining five lenses are made of plastic for combined design.

[0070] In addition, optionally, any three of the first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are made of glass, and the remaining four lenses are made of plastic. For example, the first lens 21, the third lens 31, and the fifth lens 33 are made of glass, and the remaining lenses are made of plastic.

[0071] Existing lens groups use plastic lenses. Plastic lenses are prone to absorbing moisture after being exposed to high temperatures or high temperatures and high humidity, which can cause changes in the lenses and result in functional degradation. In the above-described lens embodiments using glass materials in this application, the water absorption and moisture absorption problems of the lenses can also be improved by utilizing the material characteristics and material combinations of the lenses, enhancing the environmental adaptability of the optical lens and the terminal device, and improving the imaging quality.

[0072] Among them, in any of the above embodiments, in the lenses made of glass materials, the refractive index of at least one lens is greater than 1.6. In this way, the environmental reliability of the optical lens is optimized when the lens is edged, and its aberration reaches the best balance state, which is beneficial to achieving a larger zoom ratio and improving the imaging quality, and can also shorten the total length of the system.

[0073] As Figure 1 shown, in some embodiments of this application, the light guide element is a prism 10. Both the incident light surface 11 and the outgoing light surface 13 of the prism 10 are spherical surfaces. The prism 10 is made of glass material. The incident light surface 11 of the prism 10 faces the side of the object to be photographed, and the outgoing light surface 13 faces the object side surface of the first lens 21. After the light entering from the incident light surface 11 is reflected by the reflecting surface 12 of the prism 10, it is then emitted through the outgoing light surface 13 and sequentially enters the first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 along the optical axis, and finally reaches the imaging surface for imaging. By providing the prism 10, the turning of light can be achieved, reducing the total length of the zoom optical lens 100 and facilitating the realization of thinness.

[0074] Specific examples are as follows:

[0075] Embodiment 1

[0076] As Figure 2 、 Figure 3 and Figure 4 shown, this embodiment provides a zoom optical lens 100, which sequentially includes a prism 10, a first lens 21, a second lens 22, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 41, and a seventh lens 42 from the object side to the image side. Among them, the first lens group 20 has a negative refractive power, the second lens group 30 has a positive refractive power, and the third lens group 40 has a negative refractive power.

[0077] The third lens 31 and the fifth lens 33 are made of glass materials, and the first lens 21, the second lens 22, the fourth lens 32, the sixth lens 41, and the seventh lens 42 are made of plastic materials.

[0078] Among them, |(R6 + R10) / (R2 + R5)| = 2.083; R2 / R5 = 1.634. The relational expression is satisfied: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3.

[0079] In this embodiment, the prism 10 is a triangular prism 10, which is a spherical prism 10. The first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are all aspherical lenses.

[0080] The aspherical surface profile can satisfy but is not limited to being defined by the following even-order aspherical formula:

[0081]

[0082] Among them, X is the sagitta of the distance from the vertex of the aspherical surface when the aspherical surface is along the optical axis direction at a position with a height of r; r is the perpendicular distance from the point on the aspherical curve to the optical axis, c is the spherical curvature of the aspherical surface vertex, and K is the conic coefficient.

[0083] For the specific parameters of the zoom optical lens 100 in this embodiment, refer to Table 1 and Table 2, where the units of the radius of curvature R, the thickness, and the Y radius (effective aperture) of the lens are all millimeters (mm).

[0084] Table 1

[0085]

[0086] Table 2

[0087]

[0088] In this embodiment, the aperture value (FNO, F-number) of the zoom optical lens 100 is 3.26 to 5 mm, and the effective focal length value is 10.1 to 22.6 mm. Among them, the distance D1 between the first lens 21 and the second lens 22 on the optical axis is D1 = 7.891 mm in the short focal state; in the medium focal state, D1 = 4.409 mm; in the long focal state, D1 = 0.997 mm. The distance D2 between the second lens 22 and the third lens 31 on the optical axis is D2 = 1.401 mm in the short focal state; in the medium focal state, D2 = 1.575 mm; in the long focal state, D2 = 2.232 mm. During the process of the optical lens changing from the short focal state to the long focal state, the F-number changes from 3 to 5, and at the same time satisfies , where . Due to the change of the F-number, the diameter of the first lens aperture can be kept unchanged during the change from the short focal to the long focal. Designed according to the basic parameters in Table 1 and Table 2 above, and combined with Figure 3 and Figure 4The schematic diagrams of the astigmatism curve, distortion curve, and chromatic spherical aberration curve shown can achieve good imaging effects and ensure that the zoom optical lens 100 can be thinned down.

[0089] Embodiment 2

[0090] As Figure 5 、 Figure 6 and Figure 7 shown, this embodiment provides a zoom optical lens 100, which sequentially includes a prism 10, a first lens 21, a second lens 22, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 41, and a seventh lens 42 from the object side to the image side. Among them, the first lens group 20 has a negative refractive power, the second lens group 30 has a positive refractive power, and the third lens group 40 has a negative refractive power.

[0091] The third lens 31 and the fifth lens 33 are made of glass, and the first lens 21, the second lens 22, the fourth lens 32, the sixth lens 41, and the seventh lens 42 are made of plastic.

[0092] Among them, |(R6 + R10) / (R2 + R5)| = 1.583; R2 / R5 = 2.126. The relational expressions are satisfied: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3.

[0093] In this embodiment, the prism 10 is a triangular prism 10, which is a spherical prism 10. The first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are all aspherical lenses.

[0094] The aspherical surface profile can be defined by, but not limited to, the following even-order aspherical formula:

[0095]

[0096] where X is the distance sagitta from the vertex of the aspherical surface when the aspherical surface is along the optical axis at a position with a height of r; r is the perpendicular distance from the point on the aspherical curve to the optical axis, c is the spherical curvature of the vertex of the aspherical surface, and K is the conic coefficient.

[0097] For the specific parameters of the zoom optical lens 100 in this embodiment, refer to Table 3 and Table 4, where the units of the radius of curvature R, thickness, and lens Y radius (effective aperture) are all millimeters (mm).

[0098] Table 3

[0099]

[0100] Table 4

[0101]

[0102] In this embodiment, the aperture value of the zoom optical lens 100 is 3.25 to 5 mm, and the effective focal length value is 10.1 to 22.7 mm. Among them, the distance D1 between the first lens 21 and the second lens 22 on the optical axis is D1 = 7.249 mm in the short focal state; in the medium focal state, D1 = 4.116 mm; in the long focal state, D1 = 0.998 mm. The distance D2 between the second lens 22 and the third lens 31 on the optical axis is D2 = 2.089 mm in the short focal state; in the medium focal state, D2 = 2.480 mm; in the long focal state, D2 = 3.947 mm. During the process of the optical lens changing from the short focal state to the long focal state, the F-number changes from 3 to 5, and at the same time satisfies , where . Due to the change of the F-number, the diameter of the first lens aperture can be kept unchanged during the change from the short focal length to the long focal length. According to the basic parameters design in Table 3 and Table 4 above, and combined with Figure 6 and Figure 7 shown in the schematic diagrams of the astigmatism curve, distortion curve and chromatic spherical aberration curve, a good imaging effect can be achieved, and it is ensured that the zoom optical lens 100 can be thinned.

[0103] Embodiment 3

[0104] As Figure 8 and Figure 9 shown, this embodiment provides a zoom optical lens 100, which sequentially includes a prism 10, a first lens 21, a second lens 22, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 41 and a seventh lens 42 from the object side to the image side. Among them, the first lens group 20 has a negative refractive power, the second lens group 30 has a positive refractive power, and the third lens group 40 has a negative refractive power.

[0105] The third lens 31 and the fifth lens 33 are made of glass, and the first lens 21, the second lens 22, the fourth lens 32, the sixth lens 41 and the seventh lens 42 are made of plastic.

[0106] Among them, |(R6 + R10) / (R2 + R5)| = 2.028; R2 / R5 = 1.540. The relational expression is satisfied: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3.

[0107] In this embodiment, the prism 10 is a triangular prism 10, which is a spherical prism 10. The first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41 and the seventh lens 42 are all aspherical lenses.

[0108] The aspherical surface profile can meet but is not limited to being defined by the following even-order aspherical formula:

[0109]

[0110] Where X is the distance sagitta from the vertex of the aspherical surface when the aspherical surface is along the optical axis at a position with a height of r; r is the perpendicular distance from the point on the aspherical curve to the optical axis, c is the spherical curvature at the vertex of the aspherical surface, and K is the conic coefficient.

[0111] For the specific parameters of the zoom optical lens 100 in this embodiment, refer to Table 5 and Table 6, where the units of the radius of curvature R, thickness, and the Y radius (effective aperture) of the lens are all millimeters (mm).

[0112] Table 5

[0113]

[0114] Table 6

[0115]

[0116] In this embodiment, the aperture value of the zoom optical lens 100 is from 3.21 to 5 mm, and the effective focal length value is from 10.1 to 22.6 mm. Among them, the distance D1 between the first lens 21 and the second lens 22 on the optical axis is D1 = 7.019 mm in the short focal state; in the medium focal state, D1 = 4.080 mm; in the long focal state, D1 = 1 mm. The distance D2 between the second lens 22 and the third lens 31 on the optical axis is D2 = 6.2 mm in the short focal state; in the medium focal state, D2 = 6.824 mm; in the long focal state, D2 = 9.22 mm. During the process of the optical lens changing from the short focal state to the long focal state, the F-number changes from 3 to 5, and at the same time satisfies , where . Due to the change of the F-number, the diameter of the first lens aperture can be kept unchanged during the change from short focal to long focal. Designed according to the basic parameters in Table 5 and Table 6 above, and combined with Figure 9 The schematic diagrams of the astigmatism curve and distortion curve shown can achieve a good imaging effect and ensure that the zoom optical lens 100 can be thinned.

[0117] Example 4

[0118] Such as Figure 10 , Figure 11 and Figure 12As shown in the figure, this embodiment provides a zoom optical lens 100, which sequentially includes a prism 10, a first lens 21, a second lens 22, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 41, and a seventh lens 42 from the object side to the image side. Among them, the first lens group 20 has a negative refractive power, the second lens group 30 has a positive refractive power, and the third lens group 40 has a negative refractive power.

[0119] The third lens 31 and the fifth lens 33 are made of glass, and the first lens 21, the second lens 22, the fourth lens 32, the sixth lens 41, and the seventh lens 42 are made of plastic.

[0120] Among them, |(R6 + R10) / (R2 + R5)| = 2.163; R2 / R5 = 1.421. The following relational expressions are satisfied: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3.

[0121] In this embodiment, the prism 10 is a triangular prism 10, which is a spherical prism 10. The first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41, and the seventh lens 42 are all aspherical lenses.

[0122] The aspherical surface profile can be defined by, but is not limited to, the following even-order aspherical formula:

[0123]

[0124] Among them, X is the distance sag from the vertex of the aspherical surface when the aspherical surface is along the optical axis at a position with a height of r; r is the perpendicular distance from the point on the aspherical curve to the optical axis, c is the spherical curvature of the aspherical surface vertex, and K is the conic coefficient.

[0125] For the specific parameters of the zoom optical lens 100 in this embodiment, please refer to Table 7 and Table 8, where the units of the radius of curvature R, the thickness, and the Y radius (effective aperture) of the lens are all millimeters (mm).

[0126] Table 7

[0127]

[0128] Table 8

[0129]

[0130] In this embodiment, the aperture value of the zoom optical lens 100 is from 3.18 to 5 mm, and the effective focal length value is from 10.1 to 22.7 mm. Among them, the distance D1 between the first lens 21 and the second lens 22 on the optical axis is D1 = 6.972 mm in the short focal state; in the medium focal state, D1 = 4.087 mm; in the long focal state, D1 = 0.998 mm. The distance D2 between the second lens 22 and the third lens 31 on the optical axis is D2 = 7.025 mm in the short focal state; in the medium focal state, D2 = 7.580 mm; in the long focal state, D2 = 10.029 mm. During the process of the optical lens changing from the short focal state to the long focal state, the F-number changes from 3 to 5, and at the same time satisfies , where . Due to the change of the F-number, the diameter of the first lens aperture can be kept unchanged during the change from the short focal length to the long focal length. According to the basic parameters designed in the above Table 7 and Table 8, and combined with Figure 11 and Figure 12 shown in the schematic diagrams of the astigmatism curve, distortion curve and chromatic spherical aberration curve, a good imaging effect can be achieved, and it is ensured that the zoom optical lens 100 can be thinned.

[0131] Embodiment 5

[0132] As Figure 13 , Figure 14 and Figure 15 shown, this embodiment provides a zoom optical lens 100, which sequentially includes a prism 10, a first lens 21, a second lens 22, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 41 and a seventh lens 42 from the object side to the image side. Among them, the first lens group 20 has a negative refractive power, the second lens group 30 has a positive refractive power, and the third lens group 40 has a negative refractive power.

[0133] The third lens 31 and the fifth lens 33 are made of glass, and the first lens 21, the second lens 22, the fourth lens 32, the sixth lens 41 and the seventh lens 42 are made of plastic.

[0134] Among them, |(R6 + R10) / (R2 + R5)| = 2.167; R2 / R5 = 1.425. The relational expression is satisfied: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 or 1.5 ≤ R2 / R5 ≤ 3.

[0135] In this embodiment, the prism 10 is a triangular prism 10, which is a spherical prism 10. The first lens 21, the second lens 22, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 41 and the seventh lens 42 are all aspherical lenses.

[0136] The aspherical surface type can satisfy but is not limited to being defined by the following even aspherical formula:

[0137]

[0138] Among them, X is the distance sagitta from the vertex of the aspheric surface when the aspheric surface is along the optical axis at a position with a height of r; r is the perpendicular distance from the point on the aspheric curve to the optical axis, c is the spherical curvature of the vertex of the aspheric surface, and K is the conic coefficient.

[0139] For the specific parameters of the zoom optical lens 100 in this embodiment, refer to Table 9 and Table 10, where the units of the radius of curvature R, thickness, and lens Y radius (effective aperture) are all millimeters (mm).

[0140] Table 9

[0141]

[0142] Table 10

[0143]

[0144] In this embodiment, the aperture value of the zoom optical lens 100 is from 3.18 to 5 mm, and the effective focal length value is from 10.1 to 22.6 mm. Among them, the distance D1 between the first lens 21 and the second lens 22 on the optical axis is D1 = 6.966 mm in the short focal state; in the medium focal state, D1 = 4.092 mm; in the long focal state, D1 = 0.997 mm. The distance D2 between the second lens 22 and the third lens 31 on the optical axis is D2 = 6.98 mm in the short focal state; in the medium focal state, D2 = 7.537 mm; in the long focal state, D2 = 9.981 mm. During the process of the optical lens changing from the short focal state to the long focal state, the F-number changes from 3 to 5, and at the same time satisfies , where . Due to the change of the F-number, the diameter of the first lens aperture can be kept unchanged during the change from the short focal to the long focal. Designed according to the basic parameters in Table 9 and Table 10 above, and combined with Figure 14 and Figure 15 the schematic diagrams of the astigmatism curve, distortion curve, and chromatic spherical aberration curve shown, a good imaging effect can be achieved, and it is ensured that the zoom optical lens 100 can be thinned.

[0145] In any of the above embodiments, it can also be set that the first lens 21, the third lens 31, and the fifth lens 33 are made of glass, and the second lens 22, the fourth lens 32, the sixth lens 41, and the seventh lens 42 are made of plastic. Of course, it can also be selected that the second lens 22, the fourth lens 32, and the fifth lens 33 are made of glass, and the first lens 21, the third lens 31, the sixth lens 41, and the seventh lens 42 are made of plastic.

[0146] An embodiment of the present application further provides a terminal device, including the zoom optical lens 100 described in any of the above embodiments.

[0147] The terminal device provided in this embodiment may be a mobile phone, which includes the zoom optical lens 100 described in any of the above embodiments, and thus has all the beneficial effects of the zoom optical lens 100 described in any of the above embodiments, which will not be elaborated here one by one.

[0148] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A zoom optical lens, characterized in that, It sequentially includes a light guide element, a first lens group, a second lens group, and a third lens group from the object side to the image side; The light guide element includes a light incident surface, a reflective surface, and a light exit surface facing the first lens group. The light on the object side enters from the light incident surface, is reflected by the reflective surface, and then enters the first lens group, the second lens group, and the third lens group in sequence through the light exit surface; There are three lens groups with bending power. The first lens group has negative refractive power and is composed of a first lens and a second lens; The second lens group has positive refractive power and is composed of a third lens, a fourth lens, and a fifth lens; The third lens group has negative refractive power and is composed of a sixth lens and a seventh lens; The optical lens satisfies the relational expressions: 1.5 ≤ |(R6 + R10) / (R2 + R5)| ≤ 2.5 and 1.5 ≤ R2 / R5 ≤ 3, where R2 is the curvature radius of the image side surface of the first lens, R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and R10 is the curvature radius of the image side surface of the fifth lens.

2. The zoom optical lens according to claim 1, wherein The optical lens satisfies: , where is the optical zoom ratio, is the focal length of the optical lens when it is at the telephoto end, is the focal length of the optical lens when it is at the wide-angle end.

3. The zoom optical lens according to claim 1, characterized in that, The optical lens satisfies: TTL / ≤1.1, where TTL is the overall optical length of the optical lens, is the focal length of the optical lens at telephoto.

4. The zoom optical lens according to claim 1, characterized in that, The first lens and the second lens are relatively fixed; The third lens, the fourth lens, and the fifth lens are relatively fixed; The sixth lens and the seventh lens are relatively fixed.

5. The zoom optical lens according to claim 1, characterized in that, The image side surface and the object side surface of the first lens are both concave surfaces, the image side surface of the second lens is a concave surface, and the object side surface of the second lens is a convex surface; The image side surface of the third lens is a convex surface, the object side surfaces of the fourth lens and the fifth lens are concave surfaces, and the image side surfaces of the third lens, the fourth lens, and the fifth lens are all convex surfaces; The object side surfaces of the sixth lens and the seventh lens are concave surfaces, and the image side surfaces of the sixth lens and the seventh lens are convex surfaces.

6. The zoom optical lens according to claim 1, wherein The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses.

7. The zoom optical lens according to claim 1, characterized in that, Any two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are made of glass, and the remaining five lenses are made of plastic; or any three of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are made of glass, and the remaining four lenses are made of plastic.

8. The zoom optical lens according to claim 1, wherein, During the process of the optical lens changing from the short - focal state to the long - focal state, the distance between the first lens group and the second lens group gradually decreases, and the distance between the third lens group and the imaging surface gradually increases.

9. The zoom optical lens according to claim 8, wherein, The first lens group and the second lens group move in a linear manner, and the third lens group and the imaging surface move in a non - linear manner; or the first lens group and the second lens group move in a non - linear manner, and the third lens group and the imaging surface move in a linear manner.

10. The zoom optical lens according to claim 1, characterized in that, The optical lens satisfies: 3 ≤ FNO ≤ 5, where FNO is the aperture value of the optical lens.

11. The zoom optical lens according to claim 1, wherein, The maximum distance between the image side of the sixth lens and the object side of the seventh lens is d, satisfying the relationship: 0 ≤ d ≤ 3 mm.

12. The zoom optical lens according to claim 1, wherein, The light guide element is a prism, and both the light incident surface and the light exit surface of the prism are spherical surfaces.

13. A terminal device, characterized in that, It includes the zoom optical lens according to any one of claims 1 to 12.

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