Optical system, camera module and electronic device

Abstract

The present application relates to the technical field of optics. Disclosed are an optical system, a camera module, and an electronic device. The optical system comprises a reflector, a first lens group, a zoom lens group, a focusing lens group and a photosensitive element which are successively arranged along a first optical axis; the first lens group has a negative focal power; the zoom lens group has a positive focal power; the focusing lens group has a negative focal power. The reflector is configured to reflect light incident along a second optical axis, and emit the reflected light along the first optical axis, the first optical axis and the second optical axis being arranged at an included angle. Both the zoom lens group and the focusing lens group can move in a reciprocating direction along the first optical axis, so as to adjust the focal length of the optical system.

Description

Optical systems, camera modules and electronic devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510092763.1, filed in China on January 21, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of optical technology, specifically to an optical system, a camera module, and an electronic device. Background Technology

[0004] With the widespread adoption of smartphones and other smart devices, the camera function of these devices has become increasingly important, serving as a key factor for consumers when choosing a device. Telephoto lenses, as one of the most frequently used features in photography, have become an essential function of smart device cameras.

[0005] In related technologies, some smart terminals have proposed using different optical modules for different focal lengths to further improve the shooting experience during telephoto photography. For example, a dual telephoto camera solution might include both 3X and 5X cameras to capture images at two different focal lengths. However, this method requires independent optical modules for different focal lengths, which increases the size and weight of the camera, hindering the pursuit of a thinner and lighter smart terminal.

[0006] Application content

[0007] This application provides an optical system, a camera module, and an electronic device that helps reduce the size and weight of the camera, thereby facilitating the thinning and lightening of smart terminals.

[0008] In a first aspect, this application provides an optical system, including a reflector, a first lens group, a zoom lens group, a focusing lens group, and a photosensitive element arranged sequentially along a first optical axis, wherein the first lens group has negative optical power, the zoom lens group has positive optical power, and the focusing lens group has negative optical power;

[0009] The reflector is used to reflect light incident along the second optical axis and to make the reflected light exit along the first optical axis, wherein the first optical axis and the second optical axis are set at an angle.

[0010] Both the zoom lens group and the focusing lens group can move along the first optical axis in a reciprocating direction to adjust the focal length of the optical system.

[0011] Secondly, this application provides a camera module, including an infrared filter and the optical system described in the first aspect, wherein the infrared filter is located between the focusing lens group and the photosensitive element.

[0012] Thirdly, this application provides an electronic device including the camera module described in the second aspect.

[0013] In this embodiment, since both the zoom lens group and the focusing lens group can move in a reciprocating direction along the first optical axis to adjust the focal length of the optical system, continuous zoom of the optical system can be achieved, which is beneficial for achieving shooting experiences at different focal lengths. Therefore, compared to using different optical modules to achieve shooting at different focal lengths, the optical system provided in this embodiment can achieve shooting at different focal lengths based on a single optical system. This helps to reduce the size and weight of the camera, thereby contributing to the thinner and lighter design of smart terminals. Attached Figure Description

[0014] Figure 1 is a schematic diagram of the optical system provided in Embodiment 1 of this application when it is at the wide-angle end;

[0015] Figure 2 is a schematic diagram of the optical system provided in Embodiment 1 of this application when it is at the telescope end;

[0016] Figure 3 is a schematic diagram of the axial color difference at the wide-angle end in Embodiment 1 of this application;

[0017] Figure 4 is a schematic diagram of the defocused MTF at the wide-angle end in Embodiment 1 of this application;

[0018] Figure 5 is a schematic diagram of axial color difference at the telescope end in Embodiment 1 of this application;

[0019] Figure 6 is a schematic diagram of the defocused MTF at the telescope end in Embodiment 1 of this application;

[0020] Figure 7 is a schematic diagram of the optical system provided in Embodiment 2 of this application when it is at the wide-angle end;

[0021] Figure 8 is a schematic diagram of the optical system provided in Embodiment 2 of this application when it is at the telescope end;

[0022] Figure 9 is a schematic diagram of the axial color difference at the wide-angle end in Embodiment 2 of this application;

[0023] Figure 10 is a schematic diagram of the defocused MTF at the wide-angle end in Embodiment 2 of this application;

[0024] Figure 11 is a schematic diagram of axial color difference at the telescope end in Embodiment 2 of this application;

[0025] Figure 12 is a schematic diagram of the defocused MTF at the telescope end in Embodiment 2 of this application;

[0026] Figure 13 is a schematic diagram of the optical system provided in Embodiment 3 of this application when it is at the wide-angle end;

[0027] Figure 14 is a schematic diagram of the optical system provided in Embodiment 3 of this application when it is at the telescope end;

[0028] Figure 15 is a schematic diagram of the axial color difference at the wide-angle end in Embodiment 3 of this application;

[0029] Figure 16 is a schematic diagram of the defocused MTF at the wide-angle end in Embodiment 3 of this application;

[0030] Figure 17 is a schematic diagram of axial color difference at the telescope end in Embodiment 3 of this application;

[0031] Figure 18 is a schematic diagram of the defocused MTF at the telescope end in Embodiment 3 of this application;

[0032] Figure 19 is a schematic diagram of the optical system provided in Embodiment 4 of this application when it is at the wide-angle end;

[0033] Figure 20 is a schematic diagram of the optical system provided in Embodiment 4 of this application when it is at the telescope end;

[0034] Figure 21 is a schematic diagram of the axial color difference at the wide-angle end in Embodiment 4 of this application;

[0035] Figure 22 is a schematic diagram of the defocused MTF at the wide-angle end in Embodiment 4 of this application;

[0036] Figure 23 is a schematic diagram of axial color difference at the telescope end in Embodiment 4 of this application;

[0037] Figure 24 is a schematic diagram of the defocused MTF at the telescope end in Embodiment 4 of this application;

[0038] Figure 25 is a schematic diagram of the optical system provided in Embodiment 5 of this application when it is at the wide-angle end;

[0039] Figure 26 is a schematic diagram of the optical system provided in Embodiment 5 of this application when it is at the telescope end;

[0040] Figure 27 is a schematic diagram of the axial color difference at the wide-angle end in Embodiment 5 of this application;

[0041] Figure 28 is a schematic diagram of the defocused MTF at the wide-angle end in Embodiment 5 of this application;

[0042] Figure 29 is a schematic diagram of axial color difference at the telescope end in Embodiment 5 of this application;

[0043] Figure 30 is a schematic diagram of the defocused MTF at the telescope end in Embodiment 5 of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0045] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0046] The following description, in conjunction with the accompanying drawings, details an optical system, camera module, and electronic device provided in this application through specific embodiments and application scenarios.

[0047] To facilitate understanding, the relevant technical terms involved in the embodiments of this application will first be explained and described:

[0048] Focal length (EFL) is a measure of an optical system's ability to focus or disperse light. It refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when a distant object is projected into a sharp image through the lens or lens group. From a practical perspective, it can be understood as the distance from the center of the lens (lens assembly) to the image plane.

[0049] Optical power is the ability of a lens to refract a parallel beam of light incident from an incident lens.

[0050] The field of view (FOV) is the angle between the two edges of the lens, representing the maximum area through which the image of the subject can be captured. The size of the FOV determines the range of the lens's field of view; a larger FOV results in a wider field of view. The half field of view (HFOV) is half of the FOV.

[0051] Aperture is a device used to control the amount of light passing through the lens into an electronic device. It is usually expressed inside the lens using the F# value.

[0052] Aperture number F# is a relative value derived from the lens's focal length and the lens's light-gathering diameter (the reciprocal of the relative aperture). The smaller the aperture number F#, the more light enters the lens in the same unit of time, resulting in a shallower depth of field. This will blur the background content in the photo, producing an effect similar to that of a telephoto lens.

[0053] The object side is the side of the lens that faces the subject, and the side of the lens that faces the object side is the object side of the lens.

[0054] The image side is the side in the lens where the image of the subject is located, and the side of the lens facing the image side is the image side surface.

[0055] Infrared cut-off filter: The substrate is flat glass, and the surface is coated with an AR anti-reflection film and an IR cut-off film respectively to filter near-infrared light;

[0056] Chip: also known as the imaging surface or light receiver, is where light rays from the object are refracted by the imaging lens and imaged onto the chip.

[0057] Please refer to Figure 1, which is a schematic diagram of an optical system provided in an embodiment of this application. The optical system includes a reflector 100, a first lens group 200, a zoom lens group 300, a focusing lens group 400, and a photosensitive element 500 arranged sequentially along a first optical axis 700. The first lens group 200 has negative optical power, the zoom lens group 300 has positive optical power, and the focusing lens group 400 has negative optical power.

[0058] The reflector 100 is used to reflect light incident along the second optical axis 800 and to make the reflected light exit along the first optical axis 700, wherein the first optical axis 700 and the second optical axis 800 are arranged at an angle.

[0059] Both the zoom lens group 300 and the focusing lens group 400 can move along the first optical axis 700 in a reciprocating direction to adjust the focal length of the optical system.

[0060] The aforementioned optical system can be used in various periscope cameras, specifically in periscope cameras with telephoto shooting capabilities. In some embodiments of this application, the optical system can be applied to cameras in mobile terminals such as mobile phones and tablets. When the optical system is applied to a mobile terminal, the extension direction of the first optical axis 700 can be perpendicular to the thickness direction of the mobile terminal, and the extension direction of the second optical axis 800 can be the thickness direction of the mobile terminal. This facilitates the realization of continuous zoom telephoto shooting functionality in mobile terminals.

[0061] It is understood that during the shooting process based on the optical system, external light can be incident on the reflector 100 along the second optical axis 800, and the light reflected by the reflector 100 can be transmitted sequentially along the following path: reflector 100, first lens group 200, zoom lens group 300, focusing lens group 400 and photosensitive element 500, so as to form an image.

[0062] The aforementioned reflector 100 can be any reflector 100 with a reflective surface in an optical system, such as a prism, a plane mirror, or a component containing a reflective surface. In this process, the main function of the reflector 100 is to deflect the light path. Furthermore, in some embodiments of this application, the reflector 100 can also form an image stabilization assembly with a mechanical structure such as a motor. For example, the image stabilization assembly can drive the reflector 100 to perform at least one of the following movements to achieve optical image stabilization: rotating about a first optical axis 700, rotating about a second optical axis 800, and oscillating about the intersection of the first optical axis 700 and the second optical axis 800 in the plane formed by the first optical axis 700 and the second optical axis 800.

[0063] In some embodiments of this application, when the optical system is applied to a camera module, the camera module may include a housing, a first driving component, a second driving component, a third driving component, and the aforementioned optical system. The optical system, the first driving component, the second driving component, and the third driving component may be respectively disposed within the housing. The first driving component may be connected to the zoom lens group 300 to drive the zoom lens group 300 to move in a reciprocating direction along the first optical axis 700. The second driving component may be connected to the focusing lens group 400 to drive the focusing lens group 400 to move in a reciprocating direction along the first optical axis 700. The third driving component may be connected to the reflector 100 to drive the reflector 100 to perform the aforementioned optical image stabilization action.

[0064] The first driving component, the second driving component, and the third driving component can be various driving components used in cameras in the related art, such as various electromagnetic driving motors.

[0065] Specifically, when it is necessary to increase the focal length of the optical system, the zoom lens group 300 and the focusing lens group 400 can be controlled to move along the first optical axis 700 towards the telephoto end, that is, the zoom lens group 300 and the focusing lens group 400 can be controlled to move along the first optical axis 700 towards the reflector 100. Correspondingly, when it is necessary to decrease the focal length of the optical system, the zoom lens group 300 and the focusing lens group 400 can be controlled to move along the first optical axis 700 towards the wide-angle end, that is, the zoom lens group 300 and the focusing lens group 400 can be controlled to move along the first optical axis 700 towards the photosensitive element 500.

[0066] The aforementioned photosensitive element 500 can be a photosensitive chip, which can serve as a light receiver. Object light rays are refracted by the imaging lens and then imaged onto the photosensitive element 500.

[0067] In this embodiment, since both the zoom lens group 300 and the focusing lens group 400 can move in a reciprocating direction along the first optical axis 700 to adjust the focal length of the optical system, continuous zoom of the optical system can be achieved, which is beneficial for achieving shooting experiences at different focal lengths. Therefore, compared to using different optical modules to achieve shooting at different focal lengths, the optical system provided in this application embodiment can achieve shooting at different focal lengths based on a single optical system. This helps to reduce the size and weight of the camera, thereby contributing to the thinner and lighter design of smart terminals.

[0068] Furthermore, compared to related technologies that employ different optical modules for shooting at different focal lengths, this approach does not involve physical optical zoom but rather digital "relay" zoom using different cameras, with each camera handling different focal lengths, resulting in a loss of image quality. In contrast, the optical system provided in this application achieves zoom by controlling the reciprocating movement of the zoom lens group 300 and the focusing lens group 400 along the first optical axis 700. Therefore, it enables physically continuous optical lossless zoom across different focal lengths, improving image quality, zoom continuity, and user experience.

[0069] Optionally, the focal length adjustment range of the optical system is between a first focal length ft and a second focal length fw, where a≤|f1 / f|≤b, c≤|f2 / fw|≤d, a, b, c, and d are all positive numbers, and c<a<d<b, f1 is the focal length of the first lens group 200, and f2 is the focal length of the zoom lens group 300.

[0070] The values ​​of a, b, c, and d can be set as needed. In some embodiments of this application, the value of a is 0.8, the value of b is 2.0, the value of c is 0.5, and the value of d is 1.0. In other embodiments of this application, the value of a is 0.9, the value of b is 2.0, the value of c is 0.5, and the value of d is 1.0.

[0071] The first focal length can be the telephoto focal length of the optical system, and the second focal length can be the wide-angle focal length of the optical system. It is understood that by controlling the zoom lens group 300 and the focusing lens group 400 to move along the first optical axis 700, the focal length of the optical system can be adjusted to any focal length value between the telephoto and wide-angle focal lengths. The focal length range between the first and second focal lengths can be a relatively long range, for example, 3X to 5X.

[0072] In this embodiment, by setting 0.8≤|f1 / ft|≤2.0 and 0.5≤|f2 / fw|≤1, the optical system can be focused over a longer focal length range, thereby reducing the size of the optical system while increasing the focal length range.

[0073] Optionally, the optical system further includes an object side, wherein the second optical axis 800 is the optical axis of the light rays from the object side to the reflector 100;

[0074] The distance from the end face of the first lens group 200 facing the reflector 100 to the object side along the optical path is the first distance TTL, and the optical path is the optical path formed by connecting the first optical axis 700 and the second optical axis 800;

[0075] Where e≤ft / fw≤g, h≤TTL / ft≤j, e, f, g, h, and j are all positive numbers, and h<e<j<g.

[0076] The values ​​of e, g, h, and j can be set as needed. In some embodiments of this application, the value of e is 1.2, the value of g is 2.0, the value of h is 0.7, and the value of g is 1.3. In other embodiments of this application, the value of e is 1.2, the value of g is 1.9, the value of h is 0.7, and the value of g is 1.3.

[0077] Specifically, the object side of the optical system refers to the side of the lens of the aforementioned optical system that faces the object being photographed; specifically, it can be the surface of the lens used to receive optics. Furthermore, the optical system may also include an image side, which can be the photosensitive surface of the photosensitive element 500.

[0078] In this embodiment, by ensuring that 1.2≤ft / fw≤2.0 and 0.7≤TTL / ft≤1.3, the optical system can be guaranteed to have a suitable zoom ratio, thereby achieving excellent imaging results.

[0079] Optionally, the first lens group 200 may move along the first optical axis 700 in a reciprocating direction.

[0080] In some embodiments of this application, when the optical system is applied to a camera module, the camera module may further include a fourth driving component. This fourth driving component can be connected to the first lens group 200 to drive the first lens group 200 to move in a reciprocating direction along the first optical axis 700. The fourth driving component can be any driving component used in cameras in the related art, such as various electromagnetic drive motors.

[0081] In this embodiment, by enabling the first lens group 200 to move in the reciprocating direction along the first optical axis 700, the first lens group 200, the zoom lens group 300, and the focusing lens group 400 can be controlled to move along the first optical axis 700 respectively during focusing, which helps to further increase the focusing range of the optical system.

[0082] In some other embodiments of this application, the first lens group 200 is a fixed group, that is, the position of the first lens group 200 cannot be moved, and only the zoom lens group 300 and the focusing lens group 400 can move along the first optical axis 700 in the reciprocating direction.

[0083] Optionally, the first lens group 200 includes a first lens 210 and a second lens 220. The first lens 210 is located between the reflector 100 and the second lens 220. The first lens 210 has positive optical power, the second lens 220 has negative optical power, the Abbe number of the first lens 210 is less than 30, and the Abbe number of the second lens 220 is greater than 50.

[0084] The first lens 210 and the second lens 220 can be two aspherical lenses.

[0085] It is understandable that the combination of the first lens 210 and the second lens 220 results in a negative optical power.

[0086] In this embodiment, since the combination of positive and negative optical power can effectively eliminate system spherical aberration, by making the first lens 210 have positive optical power and the second lens 220 have negative optical power, the Abbe number of the first lens 210 is less than 30 and the Abbe number of the second lens 220 is greater than 50, it is beneficial to eliminate spherical aberration of the light system.

[0087] Optionally, the zoom lens group 300 includes at least 3 lenses, and the focusing lens group 400 includes at least 2 lenses.

[0088] The number of lenses and the type of each lens included in the zoom lens group 300 and the focusing lens group 400 can be set as needed.

[0089] In this embodiment, by having the zoom lens group 300 include at least 3 lenses and the focusing lens group 400 include at least 2 lenses, it is beneficial to realize the zoom and focusing functions of the optical system.

[0090] Optionally, the optical system satisfies at least one of the following conditions:

[0091] Wherein, the travel distance of the zoom lens group 300 along the first optical axis 700 in the reciprocating direction is the first travel distance D1, 0.3*(ft-fw)≤D1≤0.8*(ft-fw);

[0092] Wherein, the travel distance of the focusing lens group 400 along the first optical axis 700 in the reciprocating direction is the first travel distance D2, 0.7*(ft-fw)≤D2≤1.2*(ft-fw).

[0093] In this embodiment, by ensuring that 0.3*(ft-fw)≤D1≤0.8*(ft-fw), on the one hand, the zoom stroke of the zoom lens group 300 is reduced, lowering the demand for a large-stroke motor; on the other hand, it also helps to ensure that the zoom lens group 300 has suitable sensitivity, reducing the demand for motor stroke accuracy and ensuring that the optical system can achieve fast and accurate zooming. Furthermore, by ensuring that 0.7*(ft-fw)≤D2≤1.2*(ft-fw), on the one hand, the focusing stroke of the focusing lens group 400 is reduced, lowering the demand for a large-stroke motor; on the other hand, it also helps to ensure that the focusing lens group 400 has suitable sensitivity, reducing the demand for motor stroke accuracy and ensuring that the optical system can achieve fast and accurate focusing.

[0094] Optionally, the zoom lens group 300 includes a third lens 310, a fourth lens 320, a fifth lens 330, and a sixth lens 340 arranged sequentially along the first optical axis 700. The third lens 310 is opposite to the first lens group 200, and the surface of the third lens 310 facing the first lens group 200 is convex. The fourth lens 320 is a biconvex lens, the fifth lens 330 is a biconcave lens, and the surface of the sixth lens 340 facing the focusing lens group 400 is convex.

[0095] Wherein, the travel distance of the zoom lens group 300 along the first optical axis 700 in the reciprocating direction is the first travel distance D1, 0.3*(ft-fw)≤D1≤0.8*(ft-fw).

[0096] It is understood that the shape of the surface of the third lens 310 facing away from the first lens group 200 can be set as needed, for example, it can be a convex surface or a concave surface. The shape of the surface of the sixth lens 340 facing away from the focusing lens group 400 can be set as needed, for example, it can be a convex surface or a concave surface.

[0097] During the reciprocating motion of the zoom lens group 300 along the first optical axis 700, the relative positions of the individual lenses included in the zoom lens group 300 remain unchanged, that is, the zoom lens group 300 as a whole moves along the first optical axis 700 in the reciprocating direction during this process.

[0098] The four lenses included in the aforementioned zoom lens group 300 are all aspherical lenses. When the optical system zooms from the wide-angle end to the telephoto end, the zoom lens group 300 moves towards the object side along the first optical axis 700. When the optical system zooms from the telephoto end to the wide-angle end, the zoom lens group 300 moves towards the image side along the first optical axis 700. The travel distance of the zoom lens group 300 from the wide-angle end to the telephoto end is D1, which satisfies the relationship: 0.3*(ft-fw)≤D1≤0.8*(ft-fw).

[0099] In this embodiment, by including a third lens 310, a fourth lens 320, a fifth lens 330, and a sixth lens 340 arranged sequentially along the first optical axis 700 in the zoom lens group 300, the zoom function of the optical system is facilitated. Simultaneously, by ensuring that 0.3*(ft-fw)≤D1≤0.8*(ft-fw), on the one hand, the zoom stroke of the zoom lens group 300 is reduced, lowering the demand for a large-stroke motor; on the other hand, it also helps to ensure that the zoom lens group 300 has appropriate sensitivity, reducing the requirement for motor stroke accuracy and ensuring that the optical system can achieve fast and accurate zooming.

[0100] Optionally, the focusing lens group 400 includes a seventh lens 410, an eighth lens 420, and a ninth lens 430 arranged sequentially along the first optical axis 700. The seventh lens 410 is opposite to the zoom lens group 300, and the surface of the seventh lens 410 facing the zoom lens group 300 is convex. The eighth lens 420 has positive optical power, and the ninth lens 430 has negative optical power.

[0101] Wherein, the travel distance of the focusing lens group 400 along the first optical axis 700 in the reciprocating direction is the first travel distance D2, 0.7*(ft-fw)≤D2≤1.2*(ft-fw).

[0102] The shape of the surface of the seventh lens 410 facing away from the zoom lens group 300 can be configured as needed, for example, it can be convex or concave. Furthermore, the seventh lens 410 can have positive or negative optical power, as long as the focusing lens group 400 as a whole has negative optical power. The eighth lens 420 and the ninth lens 430 can be various types of aspherical lenses.

[0103] Specifically, when focusing on a distant object, the focusing lens group 400 moves towards the object side along the first optical axis 700, and when focusing on a close object, the focusing lens group 400 moves towards the image side along the first optical axis 700. The moving distance of the focusing lens group 400 from the wide-angle end to the telephoto end is D2, which satisfies the relationship: 0.7*(ft-fw)≤D2≤1.2*(ft-fw).

[0104] In this embodiment, by including a seventh lens 410, an eighth lens 420, and a ninth lens 430 arranged sequentially along the first optical axis 700 in the focusing lens group 400, the focusing function of the optical system is facilitated. Simultaneously, by ensuring that 0.7*(ft-fw)≤D2≤1.2*(ft-fw), the focusing stroke of the focusing lens group 400 is reduced, lowering the demand for a long-stroke motor. Furthermore, it ensures that the focusing lens group 400 has appropriate sensitivity, reducing the requirement for motor stroke accuracy and guaranteeing that the optical system can achieve fast and accurate focusing.

[0105] In other embodiments of this application, the focusing lens group 400 includes two aspherical lenses, which are the tenth lens and the eleventh lens in sequence from the object side to the image side along the first optical axis 700, wherein the tenth lens has positive optical power and the eleventh lens has negative optical power.

[0106] The aspherical lens in the above embodiments is an even-order aspherical surface and satisfies the aspherical formula describing the aspherical surface:

[0107] Where Z is the sag of the surface parallel to the Z-axis, which is aligned with the optical axis; C is the curvature of the surface, which is the reciprocal of the surface's radius of curvature; K is the conic constant; A, B, C, D, E, F, G, and H are aspheric coefficients; and r is the radius.

[0108] Based on the above formula, some embodiments of its conditional boundary are as follows:

[0109] Example 1:

[0110] Please refer to Figure 1, which shows the positional relationship between the lenses inside the optical system when the light system is at the wide-angle end in this embodiment of the application. Please refer to Figure 2, which shows the positional relationship between the lenses inside the optical system when the light system is at the telephoto end in this embodiment of the application. The reflector 100 is a prism; light rays are incident along the second optical axis 800, reflected by the reflecting surface, and then exit along the first optical axis 700.

[0111] The first lens group 200 comprises two aspherical lenses. Along the first optical axis 700 from the object side to the image side, the lenses are a first lens 210 and a second lens 220. The first lens 210 has positive optical power and its Abbe number satisfies Vd1 = 19.3. The second lens 220 has negative optical power and its Abbe number satisfies Vd = 55.7. The combination of positive and negative optical power can effectively eliminate system spherical aberration.

[0112] The zoom lens group 300 includes four lenses, all of which are aspherical lenses. Specifically, along the first optical axis 700, it includes a third lens 310 with positive optical power, a fourth lens 320 with positive optical power, a fifth lens 330 with negative optical power, and a sixth lens 340 with positive optical power. From the wide-angle end to the telephoto end, the zoom group moves 4.32mm along the first optical axis 700 from the image side to the object side to achieve optical zoom.

[0113] The third lens 310 uses ultra-low dispersion glass material with a refractive index Nd of 1.5 and an Abbe number Vd of 81.6. The use of ultra-low dispersion material here can effectively reduce the chromatic aberration of the system.

[0114] The focusing lens group 400 includes three lenses, all of which are aspherical. Specifically, along the first optical axis 700, the focusing lens group 400 sequentially includes a seventh lens 410 with negative optical power, an eighth lens 420 with positive optical power, and a ninth lens 430 with negative optical power. From the wide-angle end to the telephoto end, the focusing lens group 400 moves 7.79 mm along the first optical axis 700 from the image side to the object side to achieve the focusing function.

[0115] The basic specifications achieved in Example 1 are shown in Table 1-1 below:

[0116] Where efl is the system focal length, F# is the system aperture, DFOV is the field of view, f1 is the focal length of the first lens group (200), f2 is the focal length of the zoom lens group (300), and f3 is the focal length of the focusing lens group (400).

[0117] Table 1-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 1;

[0118] Wherein, S1 is the object-side surface of the first lens 210, and S2 is the image-side surface of the first lens 210; S3 is the object-side surface of the second lens 220, and S4 is the image-side surface of the second lens 220; S5 is the object-side surface of the third lens 310, and S6 is the image-side surface of the third lens 310; S7 is the object-side surface of the fourth lens 320, and S8 is the image-side surface of the fourth lens 320; S9 is the object-side surface of the fifth lens 330, and S10 is the image-side surface of the fifth lens 330; S11 is the object-side surface of the sixth lens 340, and S12 is the image-side surface of the third lens 340. The image-side surface of the sixth lens 340; S13 is the object-side surface of the seventh lens 410, S14 is the image-side surface of the seventh lens 410; S15 is the object-side surface of the eighth lens 420, S16 is the image-side surface of the eighth lens 420; S17 is the object-side surface of the ninth lens 430, S18 is the image-side surface of the ninth lens 430; S19 is the object-side surface of the infrared filter 600, S20 is the image-side surface of the infrared filter 600; S21 is the image surface of the photosensitive element 500, that is, the surface of the photosensitive element 500 facing the infrared filter 600.

[0119] Table 1-3 shows the aspherical higher-order term coefficients of each lens surface in Example 1;

[0120] Please refer to Figure 3-6. The five solid curves in the chromatic aberration diagram represent wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that the lens in this embodiment controls axial chromatic aberration within a very small range at both the wide-angle and telephoto ends, demonstrating good chromatic aberration convergence. The defocus modulation transfer function (MTF) curve shows that at a spatial frequency of 100 lp / mm, the MTF across the entire field of view is greater than 0.5, indicating extremely high resolution.

[0121] Example 2:

[0122] Please refer to Figure 7, which shows the positional relationship between the lenses inside the optical system when the light system is at the wide-angle end in this embodiment of the application. Please refer to Figure 8, which shows the positional relationship between the lenses inside the optical system when the light system is at the telephoto end in this embodiment of the application. The main difference between Embodiment 2 and Embodiment 1 is that the focal lengths at the wide-angle end and the telephoto end are longer.

[0123] The basic specifications achieved in Example 2 are shown in Table 2-1 below:

[0124] Where efl is the system focal length, F# is the system aperture, DFOV is the field of view, f1 is the focal length of the first lens group (200), f2 is the focal length of the zoom lens group (300), and f3 is the focal length of the focusing lens group (400).

[0125] Table 2-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 3;

[0126] Wherein, S1 is the object-side surface of the first lens 210, and S2 is the image-side surface of the first lens 210; S3 is the object-side surface of the second lens 220, and S4 is the image-side surface of the second lens 220; S5 is the object-side surface of the third lens 310, and S6 is the image-side surface of the third lens 310; S7 is the object-side surface of the fourth lens 320, and S8 is the image-side surface of the fourth lens 320; S9 is the object-side surface of the fifth lens 330, and S10 is the image-side surface of the fifth lens 330; S11 is the object-side surface of the sixth lens 340, and S12 is the image-side surface of the third lens 340. The image-side surface of the sixth lens 340; S13 is the object-side surface of the seventh lens 410, S14 is the image-side surface of the seventh lens 410; S15 is the object-side surface of the eighth lens 420, S16 is the image-side surface of the eighth lens 420; S17 is the object-side surface of the ninth lens 430, S18 is the image-side surface of the ninth lens 430; S19 is the object-side surface of the infrared filter 600, S20 is the image-side surface of the infrared filter 600; S21 is the image surface of the photosensitive element 500, that is, the surface of the photosensitive element 500 facing the infrared filter 600.

[0127] Table 2-3 shows the aspherical higher-order terms of each lens surface in Example 3;

[0128] Please refer to Figure 9-12. The five solid curves in the chromatic aberration diagram represent wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that the lens in this embodiment controls axial chromatic aberration within a very small range at both the wide-angle and telephoto ends, demonstrating good chromatic aberration convergence. The defocus MTF diagram shows that at a spatial frequency of 100 lp / mm, the MTF across the entire field of view is greater than 0.5, indicating extremely high resolution.

[0129] Example 3:

[0130] Please refer to Figure 13, which shows the positional relationship between the lenses inside the optical system when the light system is at the wide-angle end in this embodiment of the application. Please refer to Figure 14, which shows the positional relationship between the lenses inside the optical system when the light system is at the telephoto end in this embodiment of the application. The main difference between Embodiment 3 and Embodiment 2 is that the aperture of the wide-angle and telephoto end systems is increased, and the material of the fourth lens 320 is optimized from plastic to aspherical glass, thereby improving image quality.

[0131] The basic specifications achieved in Example 3 are shown in Table 3-1 below:

[0132] Where efl is the system focal length, F# is the system aperture, DFOV is the field of view, f1 is the focal length of the first lens group (200), f2 is the focal length of the zoom lens group (300), and f3 is the focal length of the focusing lens group (400).

[0133] Table 3-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 3;

[0134] Wherein, S1 is the object-side surface of the first lens 210, and S2 is the image-side surface of the first lens 210; S3 is the object-side surface of the second lens 220, and S4 is the image-side surface of the second lens 220; S5 is the object-side surface of the third lens 310, and S6 is the image-side surface of the third lens 310; S7 is the object-side surface of the fourth lens 320, and S8 is the image-side surface of the fourth lens 320; S9 is the object-side surface of the fifth lens 330, and S10 is the image-side surface of the fifth lens 330; S11 is the object-side surface of the sixth lens 340, and S12 is the image-side surface of the third lens 340. The image-side surface of the sixth lens 340; S13 is the object-side surface of the seventh lens 410, S14 is the image-side surface of the seventh lens 410; S15 is the object-side surface of the eighth lens 420, S16 is the image-side surface of the eighth lens 420; S17 is the object-side surface of the ninth lens 430, S18 is the image-side surface of the ninth lens 430; S19 is the object-side surface of the infrared filter 600, S20 is the image-side surface of the infrared filter 600; S21 is the image surface of the photosensitive element 500, that is, the surface of the photosensitive element 500 facing the infrared filter 600.

[0135] Table 3-3 shows the aspherical higher-order term coefficients of each lens surface in Example 3;

[0136] Please refer to Figures 15-18. The five solid curves in the chromatic aberration diagram represent wavelengths of light at 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that the lens in this embodiment controls axial chromatic aberration within a very small range at both the wide-angle and telephoto ends, demonstrating good chromatic aberration convergence. The defocus MTF diagram shows that at a spatial frequency of 100lp / mm, the MTF across the entire field of view is greater than 0.5, indicating extremely high resolution.

[0137] Example 4:

[0138] Please refer to Figure 19, which shows the positional relationship between the lenses inside the optical system when the light system is at the wide-angle end in this embodiment of the application. Please refer to Figure 20, which shows the positional relationship between the lenses inside the optical system when the light system is at the telephoto end in this embodiment of the application. The main difference between Embodiment 4 and Embodiment 3 is that the first lens group 200 uses two glass aspherical surfaces, which can reduce the molding and reliability risks caused by the cutting edges of the plastic aspherical surfaces.

[0139] The basic specifications achieved in Example 4 are shown in Table 4-1 below:

[0140] Where efl is the system focal length, F# is the system aperture, DFOV is the field of view, f1 is the focal length of the first lens group (200), f2 is the focal length of the zoom lens group (300), and f3 is the focal length of the focusing lens group (400).

[0141] Table 4-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 4;

[0142] Wherein, S1 is the object-side surface of the first lens 210, and S2 is the image-side surface of the first lens 210; S3 is the object-side surface of the second lens 220, and S4 is the image-side surface of the second lens 220; S5 is the object-side surface of the third lens 310, and S6 is the image-side surface of the third lens 310; S7 is the object-side surface of the fourth lens 320, and S8 is the image-side surface of the fourth lens 320; S9 is the object-side surface of the fifth lens 330, and S10 is the image-side surface of the fifth lens 330; S11 is the object-side surface of the sixth lens 340, and S12 is the image-side surface of the third lens 340. The image-side surface of the sixth lens 340; S13 is the object-side surface of the seventh lens 410, S14 is the image-side surface of the seventh lens 410; S15 is the object-side surface of the eighth lens 420, S16 is the image-side surface of the eighth lens 420; S17 is the object-side surface of the ninth lens 430, S18 is the image-side surface of the ninth lens 430; S19 is the object-side surface of the infrared filter 600, S20 is the image-side surface of the infrared filter 600; S21 is the image surface of the photosensitive element 500, that is, the surface of the photosensitive element 500 facing the infrared filter 600.

[0143] Table 4-3 shows the aspherical higher-order term coefficients of each lens surface in Example 4;

[0144] Please refer to Figures 21-24. The five solid curves in the chromatic aberration diagram represent wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that the lens in this embodiment controls axial chromatic aberration within a very small range at both the wide-angle and telephoto ends, demonstrating good chromatic aberration convergence. The defocus MTF diagram shows that at a spatial frequency of 100 lp / mm, the MTF across the entire field of view is greater than 0.5, indicating extremely high resolution.

[0145] Example 5:

[0146] Please refer to Figure 25, which shows the positional relationship between the lenses inside the optical system when the light system is at the wide-angle end in this embodiment of the application. Please refer to Figure 26, which shows the positional relationship between the lenses inside the optical system when the light system is at the telephoto end in this embodiment of the application. The main difference between Embodiment 5 and other embodiments is that the focusing group uses two aspherical lenses.

[0147] The basic specifications achieved in Example 5 are shown in Table 5-1 below:

[0148] Where efl is the system focal length, F# is the system aperture, DFOV is the field of view, f1 is the focal length of the first lens group (200), f2 is the focal length of the zoom lens group (300), and f3 is the focal length of the focusing lens group (400).

[0149] Table 5-2 shows the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the optical imaging system of Example 5;

[0150] Wherein, S1 is the object-side surface of the first lens 210, and S2 is the image-side surface of the first lens 210; S3 is the object-side surface of the second lens 220, and S4 is the image-side surface of the second lens 220; S5 is the object-side surface of the third lens 310, and S6 is the image-side surface of the third lens 310; S7 is the object-side surface of the fourth lens 320, and S8 is the image-side surface of the fourth lens 320; S9 is the object-side surface of the fifth lens 330, and S10 is the image-side surface of the fifth lens 330; S1 S1 is the object-side surface of the sixth lens 340, S12 is the image-side surface of the sixth lens 340; S13 is the object-side surface of the seventh lens 410, S14 is the image-side surface of the seventh lens 410; S15 is the object-side surface of the eighth lens 420, S16 is the image-side surface of the eighth lens 420; S17 is the object-side surface of the ninth lens 430, S18 is the image-side surface of the ninth lens 430; S19 is the object-side surface of the infrared filter 600, S20 is the image-side surface of the infrared filter 600.

[0151] Table 5-3 shows the aspherical higher-order terms of each lens surface in Example 5;

[0152] Please refer to Figures 27-30. The five solid curves in the chromatic aberration diagram represent wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm, respectively. It can be seen that the lens in this embodiment controls axial chromatic aberration within a very small range at both the wide-angle and telephoto ends, demonstrating good chromatic aberration convergence. The defocus MTF diagram shows that at a spatial frequency of 100 lp / mm, the MTF across the entire field of view is greater than 0.5, indicating extremely high resolution.

[0153] This application embodiment also provides a camera module, which includes an infrared filter 600 and the optical system described in the above embodiment, wherein the infrared filter 600 is located between the focusing lens group 400 and the photosensitive element 500.

[0154] In this embodiment, since the camera module includes the optical system described in the above embodiments, the camera module can realize each process of the optical system in the above embodiments and has the same beneficial effects. To avoid repetition, it will not be described again here.

[0155] This application also provides an electronic device, including the camera module described in the above embodiments.

[0156] In this embodiment, since the electronic device includes the camera module described in the above embodiments, the electronic device can implement each process of the camera module in the above embodiments and has the same beneficial effects. To avoid repetition, it will not be described again here.

[0157] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. An optical system comprising a reflector, a first lens group, a zoom lens group, a focusing lens group, and a photosensitive element arranged sequentially along a first optical axis, wherein the first lens group has negative optical power, the zoom lens group has positive optical power, and the focusing lens group has negative optical power; wherein The reflector is used to reflect light incident along the second optical axis and to make the reflected light exit along the first optical axis, wherein the first optical axis and the second optical axis are set at an angle. Both the zoom lens group and the focusing lens group can move along the first optical axis in a reciprocating direction to adjust the focal length of the optical system.

2. The optical system according to claim 1, wherein, The focal length adjustment range of the optical system is between the first focal length ft and the second focal length fw, where a≤|f1 / f|≤b, c≤|f2 / fw|≤d, a, b, c, and d are all positive numbers, and c<a<d<b. f1 is the focal length of the first lens group, and f2 is the focal length of the zoom lens group.

3. The optical system according to claim 2, wherein, The optical system further includes an object side, and the second optical axis is the optical axis of the light rays from the object side to the reflector; The distance from the end face of the first lens group facing the reflector to the object side along the optical path is the first distance TTL, and the optical path is the optical path formed by connecting the first optical axis and the second optical axis; Where e≤ft / fw≤g, h≤TTL / ft≤j, e, f, g, h, and j are all positive numbers, and h<e<j<g.

4. The optical system according to claim 1, wherein, The first lens group can move along the first optical axis in a reciprocating direction.

5. The optical system according to claim 1, wherein, The first lens group includes a first lens and a second lens, with the first lens located between the reflector and the second lens. The first lens has positive optical power, and the second lens has negative optical power.

6. The optical system according to claim 2, wherein, The zoom lens group includes at least 3 lenses, and the focusing lens group includes at least 2 lenses.

7. The optical system according to claim 2, wherein, The optical system satisfies at least one of the following conditions: Wherein, the travel distance of the zoom lens group along the first optical axis in the reciprocating direction is the first travel distance D1, 0.3*(ft-fw)≤D1≤0.8*(ft-fw); Wherein, the travel distance of the focusing lens group along the first optical axis in the reciprocating direction is the first travel distance D2, 0.7*(ft-fw)≤D2≤1.2*(ft-fw).

8. The optical system according to claim 7, wherein, The zoom lens group includes a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the first optical axis. The third lens is opposite to the first lens group, and the surface of the third lens facing the first lens group is convex. The fourth lens is a biconvex lens, the fifth lens is a biconcave lens, and the surface of the sixth lens facing the focusing lens group is convex.

9. The optical system of claim 7, wherein, The focusing lens group includes a seventh lens, an eighth lens, and a ninth lens arranged sequentially along the first optical axis. The seventh lens is opposite to the zoom lens group, and the surface of the seventh lens facing the zoom lens group is convex. The eighth lens has positive optical power, and the ninth lens has negative optical power.

10. A camera module, comprising an infrared filter and an optical system according to any one of claims 1 to 9, wherein, The infrared filter is located between the focusing lens group and the photosensitive element.

11. An electronic device comprising the camera module of claim 10.

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