Zoom optical system, zoom imaging module and electronic equipment

Abstract

The present invention relates to a zoom optical system, a zoom imaging module, an electronic device, and a periscope optical system. The zoom optical system includes: a first lens group with positive refractive power, the first lens group including a first lens and a second lens; a second lens group with negative refractive power, the second lens group including a third lens and a fourth lens; a third lens group with positive refractive power, the third lens group including a fifth lens, a sixth lens, and a seventh lens; and a fourth lens group with positive refractive power, the fourth lens group including an eighth lens. The distance between the lens groups of the zoom optical system on the optical axis is adjustable to achieve a change in the focal length of the zoom optical system. The zoom optical system satisfies the following condition: f7 / f567≤-0.2; f7 is the effective focal length of the seventh lens, and f567 is the effective focal length of the third lens group. The above-mentioned zoom optical system has good imaging quality.

Description

Technical Field

[0001] The present invention relates to the field of photography, and in particular to a zoom optical system, a zoom imaging module and an electronic device. Background Art

[0002] With the development of the field of photography, periscope camera equipment has emerged. By arranging a right-angle prism that can change the direction of the light path on the object side of the optical system, the optical system can be placed horizontally in the shell of the periscope camera equipment during installation, thereby enabling the periscope camera equipment to have a high zoom ratio while achieving a miniaturized design.

[0003] However, the imaging quality of current periscope cameras still needs to be improved. Summary of the Invention

[0004] Based on this, it is necessary to provide a zoom optical system, a zoom imaging module and an electronic device to improve the imaging quality of the periscope camera device.

[0005] A zoom optical system, comprising, from the object side to the image side, along the optical axis:

[0006] a first lens group having positive refractive power, wherein the first lens group includes a first lens having refractive power and a second lens having refractive power;

[0007] a second lens group having negative refractive power, the second lens group including a third lens having refractive power and a fourth lens having refractive power;

[0008] a third lens group having positive refractive power, the third lens group including a fifth lens having refractive power, a sixth lens having refractive power, and a seventh lens having refractive power;

[0009] a fourth lens group having positive refractive power, wherein the fourth lens group includes an eighth lens having refractive power;

[0010] The distance between the lens groups of the zoom optical system on the optical axis is adjustable to achieve a change in the focal length of the zoom optical system;

[0011] And the zoom optical system satisfies the following conditional formula:

[0012] f7 / f567≤-0.2;

[0013] Wherein, f7 is the effective focal length of the seventh lens, and f567 is the effective focal length of the third lens group, that is, the combined focal length of the fifth lens, the sixth lens, and the seventh lens.

[0014] In the zoom optical system described above, the seventh lens provides negative refractive power for the third lens group. When the above conditional expression is satisfied, the negative refractive power of the seventh lens within the third lens group can be properly configured, thereby facilitating the third lens group to balance the spherical aberration generated by the first and second lens groups. Simultaneously, the seventh lens can provide a reasonable amount of negative refractive power for the zoom optical system, thereby improving the imaging quality of the zoom optical system. Furthermore, the effective focal length of the third lens group can be controlled within a relatively small range, thereby increasing the refractive power of the third lens group, enabling the third lens group to effectively converge light rays at the rear end of the zoom optical system, thereby facilitating a reduction in the overall length of the zoom optical system. When f7 / f567>-0.2, the refractive power of each lens in the third lens group is unevenly distributed, hindering the third lens group from correcting the aberrations generated by the first and second lens groups.

[0015] In one embodiment, the zoom optical system satisfies the following conditional formula:

[0016] fc / fd≥1.4;

[0017] Where fc is the effective focal length of the zoom optical system at the long focal length end, and fd is the effective focal length of the zoom optical system at the short focal length end. When the above conditional equation is met, the ratio of the effective focal lengths of the zoom optical system at the long focal length end to the effective focal lengths of the zoom optical system at the short focal length end can be properly configured, thereby achieving a higher zoom ratio for the zoom optical system and enabling a wider range of shooting magnifications. When fc / fd < 1.4, the zoom ratio of the zoom optical system is too small to meet the requirements of wide-range shooting.

[0018] In one embodiment, the zoom optical system satisfies the following conditional formula:

[0019] 3.5° / mm≤FOVc / ImgH≤6° / mm;

[0020] Wherein, FOVc is the maximum field of view (FOV) of the zoom optical system at the telephoto end, measured in degrees, and ImgH is the radius of the maximum effective imaging circle of the zoom optical system, measured in mm. When the above conditional equation is met, the ratio of the full FOV and half image height at the telephoto end of the zoom optical system can be rationally configured, facilitating the realization of the telephoto characteristics of the zoom optical system. This also enables the zoom optical system to have a large image surface, compatible with higher-pixel sensor elements, thereby achieving high-definition capture.

[0021] In one embodiment, the zoom optical system satisfies the following conditional formula:

[0022] 15≤TTL / (ATg2+ATg3)≤150;

[0023] Wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the zoom optical system, i.e., the total optical length of the zoom optical system; ATg2 is the sum of the air spaces on the optical axis between adjacent lenses in the second lens group, i.e., the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens; and ATg3 is the sum of the air spaces on the optical axis between adjacent lenses in the third lens group, i.e., the sum of the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens and the distance on the optical axis from the image side surface of the sixth lens to the object side surface of the seventh lens. When the above conditional expressions are satisfied, the total optical length of the zoom optical system and the sum of the air spaces on the optical axis between adjacent lenses in the second and third lens groups can be rationally configured. This helps to shorten the total system length of the zoom optical system while achieving a large zoom ratio of the zoom optical system, thereby achieving a compact design of the zoom optical system and saving space for electronic devices equipped with the zoom optical system. When the upper limit of the above conditional expression is exceeded, the total length of the zoom optical system is too large, which easily increases the pressure on the spatial configuration of the electronic device equipped with the zoom optical system, is not conducive to the miniaturization design of the electronic device, and also reduces the stability of the zoom optical system itself.

[0024] In one embodiment, the zoom optical system satisfies the following conditional formula:

[0025] 1≤(R7+R8) / R14≤4;

[0026] Wherein, R7 is the radius of curvature of the object side surface of the fourth lens at the optical axis, R8 is the radius of curvature of the image side surface of the fourth lens at the optical axis, and R14 is the radius of curvature of the image side surface of the seventh lens at the optical axis. When the above conditional formula is satisfied, the radius of curvature of the second lens of the second lens group and the radius of curvature of the image side surface of the seventh lens can be reasonably configured, which is beneficial for suppressing the aberrations generated by the second lens group, achieving a balanced aberration distribution between the second lens group and the object side and image side lens groups, thereby improving the imaging quality of the zoom optical system; it is also beneficial for constraining the surface shape of the fourth lens, so that the surface shape of the fourth lens is not excessively curved, thereby reducing the difficulty of molding and processing the fourth lens, and at the same time, ensuring that the surface shape of the fourth lens is not too flat, so that the fourth lens has a suitable deflection ability for light.

[0027] In one embodiment, the zoom optical system satisfies the following conditional formula:

[0028] 0.4≤f12 / f567≤4;

[0029] Wherein, f12 is the effective focal length of the first lens group, i.e., the combined focal length of the first lens and the second lens; f567 is the effective focal length of the third lens group, i.e., the combined focal length of the fifth lens, the sixth lens, and the seventh lens. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the first lens group and the third lens group can be reasonably configured, which is beneficial for the zoom optical system to obtain a larger zoom range. Furthermore, the positive refractive power of the first lens group and the third lens group can be reasonably configured, and in combination with the negative refractive power contributed by the second lens group, the movement of the second lens group and the third lens group along the optical axis can achieve different focal lengths of the zoom optical system in three states, thereby realizing the zoom characteristics of the zoom optical system.

[0030] In one embodiment, when the zoom optical system is at the telephoto end, the image-side surface of the fourth lens serves as the aperture stop of the zoom optical system; when the zoom optical system is at the short focal length, the object-side surface of the fifth lens serves as the aperture stop of the zoom optical system, and the zoom optical system satisfies the following conditional formula:

[0031] 1.01≤SD9 / SD8≤1.5;

[0032] SD9 is half the maximum effective aperture of the object-side surface of the fifth lens element, and SD8 is half the maximum effective aperture of the image-side surface of the fourth lens element. When the above conditional expression is satisfied, the aperture stop of the zoom optical system can block peripheral field light at the short focal length of the zoom optical system, reducing distortion and astigmatism, thereby reducing aberrations generated by the zoom optical system and improving the optical performance of the zoom optical system. Exceeding the upper limit of the above conditional expression can easily increase the aberration sensitivity of the zoom optical system, thereby reducing the optical performance of the zoom optical system.

[0033] In one embodiment, the zoom optical system further includes a reflective element disposed on the object side of the first lens, configured to change the direction of the optical path. The use of a reflective element in the zoom optical system enables the system to be used in a periscope-type imaging device, facilitating the miniaturization of the periscope-type imaging device.

[0034] In some embodiments, when the optical system zooms from the short focal end to the long focal end, the distance between the first lens group and the second lens group increases, and the distance between the third lens group and the fourth lens group increases.

[0035] A zoom imaging module comprises a photosensitive element and the zoom optical system described in any of the above embodiments, wherein the photosensitive element is disposed on the image side of the zoom optical system. When the zoom optical system is employed in the zoom imaging module, the third lens group can balance the spherical aberration produced by the first and second lens groups, and the seventh lens can provide a reasonable negative refractive power for the zoom optical system, thereby improving the imaging quality of the zoom imaging module and facilitating a miniaturized design of the zoom imaging module.

[0036] An electronic device includes a housing and the above-mentioned zoom imaging module, wherein the zoom imaging module is disposed in the housing. Using the above-mentioned zoom imaging module in the electronic device is beneficial to improving the imaging quality of the electronic device and facilitating the miniaturization of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of the zoom optical system in a telephoto state according to the first embodiment of the present application;

[0038] Figure 2 This is a schematic structural diagram of the zoom optical system in a short-focus state according to the first embodiment of the present application;

[0039] Figure 3 This is a structural diagram of the zoom optical system in a mid-focus state according to the first embodiment of the present application;

[0040] Figure 4 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a telephoto state in the first embodiment of the present application are shown;

[0041] Figure 5 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a short-focus state in the first embodiment of the present application are shown;

[0042] Figure 6 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a mid-focus state in the first embodiment of the present application are shown;

[0043] Figure 7 This is a schematic structural diagram of the zoom optical system in a telephoto state according to the second embodiment of the present application;

[0044] Figure 8 This is a structural diagram of the zoom optical system in a short-focus state according to the second embodiment of the present application;

[0045] Figure 9 This is a structural diagram of the zoom optical system in a mid-focus state according to the second embodiment of the present application;

[0046] Figure 10 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a telephoto state in the second embodiment of the present application are shown;

[0047] Figure 11 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a short-focus state in the second embodiment of the present application are shown;

[0048] Figure 12 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a mid-focus state in the second embodiment of the present application are shown;

[0049] Figure 13 This is a schematic structural diagram of the zoom optical system in a telephoto state according to the third embodiment of the present application;

[0050] Figure 14 This is a structural diagram of the zoom optical system in a short-focus state according to the third embodiment of the present application;

[0051] Figure 15 This is a structural diagram of the zoom optical system in a mid-focus state according to the third embodiment of the present application;

[0052] Figure 16 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a telephoto state in the third embodiment of the present application are shown;

[0053] Figure 17 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a short-focus state in the third embodiment of the present application are shown;

[0054] Figure 18 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a mid-focus state in the third embodiment of the present application are shown;

[0055] Figure 19 This is a schematic structural diagram of a zoom optical system in a telephoto state according to a fourth embodiment of the present application;

[0056] Figure 20 This is a structural diagram of the zoom optical system in a short-focus state according to the fourth embodiment of the present application;

[0057] Figure 21 This is a structural diagram of the zoom optical system in a mid-focus state according to the fourth embodiment of the present application;

[0058] Figure 22 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a telephoto state in the fourth embodiment of the present application are shown;

[0059] Figure 23The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a short-focus state in the fourth embodiment of the present application are shown;

[0060] Figure 24 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a mid-focus state in the fourth embodiment of the present application are shown;

[0061] Figure 25 This is a structural diagram of the zoom optical system in a telephoto state according to the fifth embodiment of the present application;

[0062] Figure 26 This is a structural diagram of the zoom optical system in a short-focus state according to the fifth embodiment of the present application;

[0063] Figure 27 This is a structural diagram of the zoom optical system in a middle focus state according to the fifth embodiment of the present application;

[0064] Figure 28 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a telephoto state in the fifth embodiment of the present application are shown;

[0065] Figure 29 The longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the zoom optical system in a short-focus state in the fifth embodiment of the present application are shown;

[0066] Figure 30 A longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the zoom optical system in a mid-focus state in the fifth embodiment of the present application;

[0067] Figure 31 This is a structural diagram of a zoom imaging module in one embodiment of the present application;

[0068] Figure 32 This is a schematic structural diagram of an electronic device in an embodiment of the present application. DETAILED DESCRIPTION

[0069] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0073] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0074] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0075] See Figure 1 In some embodiments of the present application, the zoom optical system 100 includes, in order from the object side to the image side along the optical axis 110, a first lens group L12, a second lens group L34, a third lens group L567, and a fourth lens group. The first lens group L12 includes a first lens L1 and a second lens L2. The second lens group L34 includes a third lens L3 and a fourth lens L4. The third lens group L567 includes a fifth lens L5, a sixth lens L6, and a seventh lens L7. The fourth lens group includes an eighth lens L8. Specifically, the first lens L1 includes an object-side surface S1 and an image-side surface S2, the second lens L2 includes an object-side surface S3 and an image-side surface S4, the third lens L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens L5 includes an object-side surface S9 and an image-side surface S10, the sixth lens L6 includes an object-side surface S11 and an image-side surface S12, the seventh lens L7 includes an object-side surface S13 and an image-side surface S14, and the eighth lens L8 includes an object-side surface S15 and an image-side surface S16.

[0076] The first lens group L12 has positive refractive power, the second lens group L34 has negative refractive power, the third lens group L567 has positive refractive power, and the fourth lens group has positive refractive power. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 all have refractive power.

[0077] It should be noted that in some embodiments of the present application, the first lens group L12 and the fourth lens group are relatively fixed, while the second lens group L34 and the third lens group L567 are movable along the optical axis 110, thereby achieving the zoom function of the zoom optical system 100. This allows the zoom optical system 100 to have a long focus state, a medium focus state, and a short focus state. The effective focal lengths of the zoom optical system 100 in the long focus state, the medium focus state, and the short focus state decrease in sequence. Furthermore, when the zoom optical system 100 is at the long focus end, the effective focal length of the zoom optical system 100 is at its maximum, and when it is at the short focus end, the effective focal length of the zoom optical system 100 is at its minimum. It is understood that when the second lens group L34 moves along the optical axis 110, the third lens L3 and the fourth lens L4 move synchronously along the optical axis 110. When the third lens group L567 moves along the optical axis 110, the fifth lens L5, the sixth lens L6, and the seventh lens L7 move synchronously along the optical axis 110. In addition, in some embodiments, the second lens group L34 can move synchronously with the third lens group L567, or can also move asynchronously.

[0078] For example, in some embodiments, the second lens group L34 moves along the optical axis 110 in a direction away from the first lens group L12, while the third lens group L34 moves along the optical axis 110 in a direction closer to the fourth lens group, so that the effective focal length of the zoom optical system 100 changes, thereby achieving the zoom function of the zoom optical system 100. In some embodiments, when the second lens group L34 moves along the optical axis 110 in a direction away from the first lens group L12, that is, the distance between the first lens group L12 and the second lens group L34 increases, and the third lens group L567 moves along the optical axis 110 in a direction away from the fourth lens group, that is, the distance between the third lens group L567 and the fourth lens group also increases, the effective focal length of the zoom optical system 100 increases. In other words, the zoom optical system 100 transitions from a short focus state to a medium focus state, or from a medium focus state to a long focus state.

[0079] It should be noted that, in the present application, the long focus state, medium focus state and short focus state of the zoom optical system 100 are merely examples of some focal length states of the zoom optical system 100. In other embodiments, as the relative positions of the second lens group L34 and the third lens L567 and the first lens group L12 and the fourth lens change, the effective focal length of the zoom optical system 100 can also have other values, that is, the zoom optical system 100 can also have other focal length states.

[0080] In some embodiments, the zoom optical system 100 can be used in a zoom lens (not shown). In this case, the zoom lens may further include a zoom ring and a fixed focus ring. The first lens group L12 and the fourth lens group are fixed in the zoom lens, and the zoom ring and the fixed focus ring are arranged between the first lens group L12 and the fourth lens group. The zoom ring is fixedly connected to the second lens group L34, and the fixed focus ring is fixedly connected to the third lens group L567. The zoom ring can drive the second lens group L34 to move along the optical axis 110, and the fixed focus ring can drive the third lens group L567 to move along the optical axis 110, thereby realizing the zoom function of the zoom lens. Of course, the zoom function of the zoom lens can also be achieved by other means, as long as the second lens group L34 and / or the third lens group L567 can be moved along the optical axis 110 to change the effective focal length of the zoom optical system 100. No further details will be given here.

[0081] In some embodiments, the zoom optical system 100 further includes an infrared cutoff filter L9 disposed on the image side of the eighth lens element L8. The infrared cutoff filter L9 includes an object-side surface S17 and an image-side surface S18. Furthermore, the zoom optical system 100 also includes an image plane S19 located on the image side of the eighth lens element L8. Incident light is imaged on the image plane S19 after being conditioned by the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8. The infrared cutoff filter L9 is used to filter out interfering light, preventing it from reaching the image plane S19 of the zoom optical system 100 and affecting normal imaging.

[0082] In some embodiments, both the object-side and image-side surfaces of each lens of the zoom optical system 100 are aspherical. The use of aspherical structures can increase the flexibility of each lens design and effectively correct the spherical aberration of the zoom optical system 100, thereby improving imaging quality. In other embodiments, both the object-side and image-side surfaces of each lens of the optical system 100 can also be spherical. It should be noted that the above embodiments are merely examples of some embodiments of the present application. In some embodiments, the surfaces of each lens in the zoom optical system 100 can be any combination of aspherical and spherical surfaces.

[0083] In some embodiments, the lenses in the zoom optical system 100 can be made entirely of glass or entirely of plastic. Using lenses made of plastic, such as polycarbonate, can reduce the weight and production costs of the zoom optical system 100, while using lenses made of glass can ensure that the zoom optical system 100 has excellent optical performance and high temperature resistance. Furthermore, the lenses in the zoom optical system 100 can be made of any combination of glass and plastic, not necessarily all glass or all plastic.

[0084] It should be noted that the first lens L1 does not necessarily consist of only one lens. In some embodiments, the first lens L1 may comprise two or more lenses, which can form a cemented lens. The surface of the cemented lens closest to the object side can be considered the object-side surface S1, and the surface closest to the image side can be considered the image-side surface S2. Alternatively, the lenses in the first lens L1 do not form a cemented lens, but the distances between the lenses are relatively fixed. In this case, the object-side surface of the lens closest to the object side is the object-side surface S1, and the image-side surface of the lens closest to the image side is the image-side surface S2. Furthermore, in some embodiments, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, or the eighth lens L8 can be greater than or equal to two, and any adjacent lenses can form a cemented lens or a non-cemented lens.

[0085] In some embodiments, the zoom optical system 100 may further include a rectangular prism 120. The rectangular prism 120 may be made of glass or plastic. The rectangular prism 120 is positioned on the object side of the first lens group L12 to change the direction of the optical path. In some embodiments, the rectangular prism 120 can change the direction of the optical path by 90°. In this case, the zoom optical system 100 constitutes a periscope optical system and can be used in periscope electronic devices such as smartphones and tablets that have a periscope lens design. The rectangular prism 120 includes a first surface Sa, a second surface Sb, and a third surface Sc. The second surface Sb forms a 90° angle with the optical axis 110. The second surface Sb is capable of reflecting light to change the direction of the optical path. Light enters the rectangular prism 120 from the first surface Sa, reflects from the second surface Sb, and then exits from the third surface Sc, entering the first lens group L12. Of course, in other embodiments, the zoom optical system 100 may also use other reflective elements instead of the right-angle prism 120, as long as it can change the direction of the light path.

[0086] Furthermore, in some embodiments, the zoom optical system 100 satisfies the conditional equation: f7 / f567 ≤ -0.2, where f7 is the effective focal length of the seventh lens element L7, and f567 is the effective focal length of the third lens group L567. Specifically, f7 / f567 can be: -0.81, -0.79, -0.78, -0.75, -0.73, -0.70, -0.64, -0.62, -0.60, or -0.59. Seventh lens L7 provides negative refractive power to third lens group L567. When the above conditional expression is satisfied, the negative refractive power of seventh lens L7 within third lens group L567 can be optimally allocated, effectively balancing the spherical aberration produced by first lens group L12 and second lens group L34. Furthermore, seventh lens L7 provides a reasonable amount of negative refractive power for zoom optical system 100, thereby improving the imaging quality of zoom optical system 100. Furthermore, the effective focal length of third lens group L567 can be controlled within a relatively small range, thereby increasing the refractive power of third lens group L567 and enabling it to effectively converge light rays at the rear end of zoom optical system 100, thereby shortening the overall length of zoom optical system 100. When f7 / f567 > -0.2, the refractive power of each lens in third lens group L567 is unevenly distributed, hindering correction of aberrations produced by first lens group L12 and second lens group L34 by third lens group L567.

[0087] In some embodiments, the zoom optical system 100 satisfies the conditional equation: fc / fd ≥ 1.4, where fc is the effective focal length of the zoom optical system 100 at the telephoto end, and fd is the effective focal length of the zoom optical system 100 at the short focal length. Specifically, fc / fd can be 1.66, 1.68, 1.70, 1.71, 1.73, 1.76, 1.77, 1.78, 1.80, or 1.81. When this conditional equation is met, the ratio of the effective focal lengths of the zoom optical system 100 at the telephoto end and the short focal length can be appropriately configured, enabling the zoom optical system 100 to achieve a higher zoom ratio, thereby enabling a wider range of shooting magnifications. When fc / fd < 1.4, the zoom ratio of the zoom optical system 100 is too small to meet the requirements of wide-range shooting.

[0088] In some embodiments, the zoom optical system 100 satisfies the conditional equation: 3.5 ≤ FOVc / ImgH ≤ 6; where FOVc is the maximum field of view (FOV) of the zoom optical system 100 at the telephoto end, expressed in degrees, and ImgH is the radius of the maximum effective imaging circle of the zoom optical system 100, expressed in mm. Specifically, FOVc / ImgH can be 4.52, 4.58, 4.60, 4.61, 4.67, 4.69, 4.70, 4.73, 4.77, or 4.91, expressed in degrees / mm. When this conditional equation is satisfied, the ratio of the full FOV to the half image height (HH) of the zoom optical system 100 at the telephoto end can be optimally configured, facilitating the realization of the telephoto characteristics of the zoom optical system 100. This also allows the zoom optical system 100 to have a large image surface, compatible with higher-pixel resolution sensors, thereby enabling high-definition capture.

[0089] It should be noted that in the present application, the zoom optical system 100 can be matched with a photosensitive element having a rectangular photosensitive surface, and the imaging surface of the zoom optical system 100 coincides with the photosensitive surface of the photosensitive element. In this case, the effective pixel area on the imaging surface of the zoom optical system 100 has a horizontal direction and a diagonal direction, and ImgH can be understood as half of the diagonal length of the effective pixel area on the imaging surface of the zoom optical system 100.

[0090] In some embodiments, the zoom optical system 100 satisfies the condition: 15 ≤ TTL / (ATg2 + ATg3) ≤ 150, where TTL is the distance from the object-side surface S1 of the first lens element L1 to the imaging plane of the zoom optical system 100 on the optical axis 110, ATg2 is the distance from the image-side surface S6 of the third lens element L3 to the object-side surface S9 of the fourth lens element L4 on the optical axis 110, and ATg3 is the sum of the air spaces between adjacent lenses in the third lens group L567 on the optical axis 110. Specifically, TTL / (ATg2 + ATg3) can be: 42.73, 46.52, 49.33, 55.04, 69.82, 70.85, 73.98, 79.55, 81.39, or 97.54. When the above conditional expression is satisfied, the total optical length of the zoom optical system 100 and the sum of the air spaces between adjacent lenses in the second lens group L34 and the third lens group L567 on the optical axis 110 can be rationally configured. This helps achieve a large zoom ratio for the zoom optical system 100 while shortening the total system length of the zoom optical system 100, thereby achieving a compact design for the zoom optical system 100 and saving space for electronic devices equipped with the zoom optical system 100. When the upper limit of the above conditional expression is exceeded, the total system length of the zoom optical system 100 is excessively large, which can easily increase the space requirements for the electronic device equipped with the zoom optical system 100, hindering the compact design of the electronic device, and also reducing the stability of the zoom optical system 100 itself.

[0091] In some embodiments, the zoom optical system 100 satisfies the condition: 1≤(R7+R8) / R14≤4, where R7 is the radius of curvature of the object-side surface S7 of the fourth lens element L4 at the optical axis 110, R8 is the radius of curvature of the image-side surface S8 of the fourth lens element L4 at the optical axis 110, and R14 is the radius of curvature of the image-side surface S14 of the seventh lens element L7 at the optical axis 110. Specifically, (R7+R8) / R14 can be: 1.67, 1.71, 1.73, 1.80, 1.88, 1.91, 1.94, 1.99, 2.13, or 2.25. When the above conditional expression is satisfied, the radius of curvature of the second lens of the second lens group L34 and the radius of curvature of the image-side surface S14 of the seventh lens L7 can be reasonably configured, which is beneficial to suppressing the aberrations generated by the second lens group L34, so that the aberration distribution between the second lens group L34 and the object-side and image-side lens groups reaches a balanced state, thereby improving the imaging quality of the zoom optical system 100; it is also beneficial to constrain the surface shape of the fourth lens L4, so that the surface shape of the fourth lens L4 will not be excessively curved, thereby reducing the difficulty of molding and processing the fourth lens L4, and at the same time, the surface shape of the fourth lens will not be too flat, so that the fourth lens has a suitable deflection ability for light.

[0092] In some embodiments, the zoom optical system 100 satisfies the condition: 0.4 ≤ f12 / f567 ≤ 4, where f12 is the effective focal length of the first lens group L12, and f567 is the effective focal length of the third lens group L567. Specifically, f12 / f567 can be 1.68, 1.71, 1.74, 1.75, 1.80, 1.93, 1.95, 1.98, 2.02, or 2.47. When the above conditional expressions are met, the ratio of the effective focal lengths of the first lens group L12 and the third lens group L567 can be reasonably configured, which is beneficial for the zoom optical system 100 to obtain a larger zoom range. In addition, the positive refractive power borne by the first lens group L12 and the third lens group L567 can also be reasonably configured, and combined with the negative refractive power contributed by the second lens group L34, the movement of the second lens group L34 and the third lens group L567 along the optical axis 110 can realize different focal lengths of the zoom optical system 100 in three states, thereby realizing the zoom characteristics of the zoom optical system 100.

[0093] In some embodiments, when the zoom optical system 100 is at the telephoto end, the image-side surface S8 of the fourth lens element L4 serves as the aperture stop of the zoom optical system 100. When the zoom optical system 100 is at the short focal length, the object-side surface S9 of the fifth lens element L5 serves as the aperture stop of the zoom optical system 100. Furthermore, the zoom optical system 100 satisfies the condition: 1.01 ≤ SD9 / SD8 ≤ 1.5. Where SD9 is half the maximum effective aperture of the object-side surface S9 of the fifth lens element L5, and SD8 is half the maximum effective aperture of the image-side surface S8 of the fourth lens element L4. Specifically, SD9 / SD8 can be 1.17, 1.18, 1.19, 1.20, 1.21, or 1.22. When the above conditional expression is satisfied, the aperture stop of the zoom optical system 100 can block peripheral field light when the zoom optical system 100 is at the short focal length, thereby reducing distortion and astigmatism, thereby reducing aberrations generated by the zoom optical system 100 and improving the optical performance of the zoom optical system 100. When the upper limit of the above conditional expression is exceeded, the aberration sensitivity of the zoom optical system 100 is likely to increase, thereby reducing the optical performance of the zoom optical system 100.

[0094] Based on the description of the above embodiments, more specific embodiments and drawings are presented below for detailed description.

[0095] First embodiment

[0096] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , Figure 1 is a schematic diagram of the zoom optical system 100 in the first embodiment in a telephoto state, Figure 2 is a schematic diagram of the zoom optical system 100 in the first embodiment in a short-focus state, Figure 3 FIG1 is a schematic diagram of the zoom optical system 100 in a neutral focus state according to the first embodiment. The zoom optical system 100 includes, from the object side to the image side, a right-angle prism 120, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a third lens element L3 having negative refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having positive refractive power, a seventh lens element L7 having negative refractive power, and an eighth lens element L8 having positive refractive power. Figure 4 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in the first embodiment in a telephoto state. Figure 5 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in the first embodiment in a short-focus state. Figure 6From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a mid-focus state according to the first embodiment. The reference wavelength of the astigmatism and distortion graphs of the zoom optical system 100 in the three states is 587.56 nm, which is the same as for other embodiments.

[0097] The object-side surface S1 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0098] The image-side surface S2 of the first lens L1 is convex at the paraxial position and concave at the circumference;

[0099] The object-side surface S3 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0100] The image-side surface S4 of the second lens L2 is concave at the paraxial portion and convex at the circumference.

[0101] The object-side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0102] The image-side surface S6 of the third lens L3 is concave at the paraxial portion and convex at the circumference.

[0103] The object-side surface S7 of the fourth lens L4 is convex at the paraxial portion and concave at the circumference.

[0104] The image-side surface S8 of the fourth lens L4 is concave at the paraxial portion and convex at the circumference.

[0105] The object-side surface S9 of the fifth lens L5 is convex at the paraxial direction and convex at the circumference.

[0106] The image-side surface S10 of the fifth lens L5 is convex at the paraxial portion and convex at the circumference.

[0107] The object-side surface S11 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0108] The image-side surface S12 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0109] The object-side surface S13 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0110] The image-side surface S14 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0111] The object-side surface S15 of the eighth lens L8 is concave at the paraxial portion and convex at the circumference.

[0112] The image-side surface S16 of the eighth lens L8 is convex at the paraxial portion and at the circumference.

[0113] The object-side surfaces and image-side surfaces of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , the seventh lens L7 , and the eighth lens L8 are all aspherical surfaces.

[0114] It should be noted that in the present application, when a surface of a lens is described as convex at the near axis (the central area of ​​the side), it can be understood that the area of ​​the surface of the lens near the optical axis 110 is convex. When a surface of a lens is described as concave at the circumference, it can be understood that the area of ​​the surface close to the maximum effective radius is concave. For example, when the surface is convex at the near axis and also convex at the circumference, the shape of the surface from the center (optical axis 110) to the edge can be purely convex; or it can first transition from a convex shape at the center to a concave shape, and then become convex when close to the maximum effective radius. This is only an example made to illustrate the relationship between the optical axis 110 and the circumference. The various shape structures (concave-convex relationship) of the surface are not fully reflected, but other situations can be deduced based on the above examples.

[0115] The first lens L1 , the third lens L3 , the fourth lens L4 , and the eighth lens L8 are all made of plastic, and the second lens L2 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all made of glass.

[0116] Furthermore, the zoom optical system 100 satisfies the conditional equation: f7 / f567=-0.66, where f7 is the effective focal length of the seventh lens element L7, and f567 is the effective focal length of the third lens group L567. The seventh lens element L7 provides negative refractive power to the third lens group L567. When this conditional equation is satisfied, the negative refractive power of the seventh lens element L7 within the third lens group L567 can be properly configured, facilitating the third lens group L567 to balance spherical aberration generated by the first lens group L12 and the second lens group L34. Furthermore, the seventh lens element L7 provides a reasonable amount of negative refractive power for the zoom optical system 100, thereby improving the imaging quality of the zoom optical system 100. Furthermore, the effective focal length of the third lens group L567 can be controlled within a relatively small range, thereby increasing the refractive power of the third lens group L567, enabling the third lens group L567 to effectively converge light rays at the rear end of the zoom optical system 100, thereby shortening the overall length of the zoom optical system 100.

[0117] The zoom optical system 100 satisfies the conditional equation: fc / fd = 1.66, where fc is the effective focal length of the zoom optical system 100 at the telephoto end, and fd is the effective focal length of the zoom optical system 100 at the short focal length. When this conditional equation is satisfied, the ratio of the effective focal lengths of the zoom optical system 100 at the telephoto end to the effective focal lengths at the short focal length end can be appropriately configured, enabling the zoom optical system 100 to achieve a higher zoom ratio and thus a wider range of shooting magnifications.

[0118] The zoom optical system 100 satisfies the conditional equation: FOVc / ImgH = 4.91; where FOVc is the maximum field of view (FOV) of the zoom optical system 100 at the telephoto end, measured in degrees, and ImgH is the radius of the maximum effective imaging circle of the zoom optical system 100, measured in mm. Meeting this conditional equation allows for a reasonable ratio of the full FOV and half image height of the zoom optical system 100 at the telephoto end, facilitating the realization of the telephoto characteristics of the zoom optical system 100. This also allows the zoom optical system 100 to have a large image surface, accommodating higher-pixel image sensors and thus enabling high-definition capture.

[0119] The zoom optical system 100 satisfies the conditional equation: TTL / (ATg2+ATg3)=56.43, where TTL is the distance on the optical axis 110 between the object-side surface S1 of the first lens L1 and the image plane of the zoom optical system 100, ATg2 is the distance on the optical axis 110 between the image-side surface S6 of the third lens L3 and the object-side surface S9 of the fourth lens L4, and ATg3 is the sum of the air spaces on the optical axis 110 between adjacent lenses in the third lens group L567. Satisfying the above conditional equation allows for optimal configuration of the overall optical length of the zoom optical system 100 and the sum of the air spaces on the optical axis 110 between adjacent lenses in the second lens group L34 and the third lens group L567. This allows for a reduction in the overall length of the zoom optical system 100 while achieving a high zoom ratio. This, in turn, allows for a compact design of the zoom optical system 100, saving space for electronic devices equipped with the zoom optical system 100.

[0120] The zoom optical system 100 satisfies the conditional equation: (R7+R8) / R14=1.93; wherein R7 is the radius of curvature of the object-side surface S7 of the fourth lens element L4 at the optical axis 110, R8 is the radius of curvature of the image-side surface S8 of the fourth lens element L4 at the optical axis 110, and R14 is the radius of curvature of the image-side surface S14 of the seventh lens element L7 at the optical axis 110. When the above conditional expression is satisfied, the radius of curvature of the second lens of the second lens group L34 and the radius of curvature of the image-side surface S14 of the seventh lens L7 can be reasonably configured, which is beneficial to suppressing the aberrations generated by the second lens group L34, so that the aberration distribution between the second lens group L34 and the object-side and image-side lens groups reaches a balanced state, thereby improving the imaging quality of the zoom optical system 100; it is also beneficial to constrain the surface shape of the fourth lens L4, so that the surface shape of the fourth lens L4 will not be excessively curved, thereby reducing the difficulty of molding and processing the fourth lens L4, and at the same time, the surface shape of the fourth lens will not be too flat, so that the fourth lens has a suitable deflection ability for light.

[0121] The zoom optical system 100 satisfies the conditional equation: f12 / f567=2.47, where f12 is the effective focal length of the first lens group L12, and f567 is the effective focal length of the third lens group L567. When this conditional equation is satisfied, the ratio of the effective focal lengths of the first lens group L12 and the third lens group L567 can be appropriately configured, which facilitates the zoom optical system 100 to achieve a larger zoom range. Furthermore, the positive refractive power of the first lens group L12 and the third lens group L567 can be appropriately configured. In combination with the negative refractive power of the second lens group L34, the movement of the second lens group L34 and the third lens group L567 along the optical axis 110 enables the zoom optical system 100 to achieve different focal lengths in three states, thereby achieving the zoom characteristics of the zoom optical system 100.

[0122] When the zoom optical system 100 is at the telephoto end, the image-side surface S8 of the fourth lens element L4 serves as the aperture stop of the zoom optical system 100. When the zoom optical system 100 is at the short focal length, the object-side surface S9 of the fifth lens element L5 serves as the aperture stop of the zoom optical system 100. Furthermore, the zoom optical system 100 satisfies the conditional equation: SD9 / SD8 = 1.21, where SD9 is half the maximum effective aperture of the object-side surface S9 of the fifth lens element L5, and SD8 is half the maximum effective aperture of the image-side surface S8 of the fourth lens element L4. When these conditional equations are satisfied, the aperture stop of the zoom optical system 100 can block peripheral field rays when the zoom optical system 100 is at the short focal length, reducing distortion and astigmatism, thereby reducing aberrations in the zoom optical system 100 and improving its optical performance. Exceeding the upper limit of these conditional equations can increase the aberration sensitivity of the zoom optical system 100, thereby reducing its optical performance.

[0123] In addition, various parameters of the zoom optical system 100 are given in Tables 1 and 2. Among them, the image plane S19 in Table 1 can be understood as the imaging plane of the optical system 100. The elements from the object plane (not shown) to the image plane S19 are arranged in the order of the elements from top to bottom in Table 1. The Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number at the optical axis 110. Surface number 1 and surface number 2 are the object side surface S1 and image side surface S2 of the first lens L1, respectively, that is, in the same lens, the surface with a smaller surface number is the object side surface, and the surface with a larger surface number is the image side surface. The first value in the "Thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis 110, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens in the image side direction on the optical axis 110.

[0124] It should be noted that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L9. In this case, the distance from the image-side surface S16 to the image surface S19 of the eighth lens element L8 remains unchanged.

[0125] In the first embodiment, the effective focal length of the zoom optical system 100 at the short focal end is f=13.8 mm, the effective focal length at the mid-focal end is f=18.0 mm, and the effective focal length at the telephoto end is f=23 mm. The aperture number FNO of the zoom optical system 100 at the short focal end is 2.821, the aperture number FNO at the mid-focal end is 3.11, and the aperture number FNO at the telephoto end is 3.82. The maximum field of view FOV of the zoom optical system 100 at the short focal end is 32.8°, the maximum field of view FOV at the mid-focal end is 24.8°, and the maximum field of view FOV at the telephoto end is 19.6°. That is, in the values ​​of the effective focal length, aperture number, and field of view in Table 1, the first value represents the value of the zoom optical system 100 at the short focal end, the second value represents the value of the zoom optical system 100 at the mid-focal end, and the third value represents the value of the zoom optical system 100 at the telephoto end. The same applies to other embodiments. The total optical length TTL of the zoom optical system 100 is 25 mm.

[0126] The reference wavelength of the focal length, refractive index and Abbe number of each lens is 587.56 nm (d-line), and the same applies to other embodiments.

[0127] Table 1

[0128]

[0129] Table 2

[0130]

[0131]

[0132] The table below shows the relative positional relationships of the lens groups in the zoom optical system 100 at different focal lengths in the first embodiment. D1 is the air spacing between the first lens group L12 and the second lens group L34 on the optical axis 110, i.e., the distance between the image-side surface S4 of the second lens L2 and the object-side surface S5 of the third lens L3 on the optical axis 110. D2 is the air spacing between the second lens group L34 and the third lens group L567 on the optical axis 110. D3 is the air spacing between the third lens group L567 and the fourth lens group on the optical axis 110. The values ​​of D1, D2, and D3 are all in mm. As can be seen from the table below, as the second lens group L34 moves away from the first lens group L12 and the third lens group L567 moves away from the fourth lens group along the optical axis 110, the effective focal length of the zoom optical system 100 increases.

[0133] Variable distance Telephoto state Short focus state Middle focus state D1 2.6023 1.1037 2.1192 D2 1.0278 4.7870 2.7845 D3 6.6585 4.4779 5.3091

[0134] Furthermore, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 3. Among them, the surface numbers from 1 to 16 represent the image side or object side S1 to S16 respectively. And K-A20 from left to right represent the type of aspheric coefficient, among which K represents the conic coefficient, A4 represents the fourth-order aspheric coefficient, A6 represents the sixth-order aspheric coefficient, A8 represents the eighth-order aspheric coefficient, and so on. In addition, the aspheric coefficient formula is as follows:

[0135]

[0136] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis 110, c is the curvature of the aspheric vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0137] Table 3

[0138]

[0139]

[0140] in addition, Figure 4 、 Figure 5 and Figure 6 The longitudinal spherical aberration diagrams (Longitudinal Spherical Aberration) of the zoom optical system 100 at different focal lengths represent the deviation of light of different wavelengths from their convergent focus after passing through the lens. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinate (PUC) from the pupil center to the pupil edge, while the abscissa represents the distance (in mm) from the imaging plane to the intersection of the light and the optical axis 110. As can be seen from the longitudinal spherical aberration diagrams, the degree of deviation of light of different wavelengths from their convergent focus in the first embodiment is consistent, effectively suppressing any blurring or color halation in the image. Figure 4 、 Figure 5 and Figure 6 Also included are astigmatic field curvature diagrams (ASTIGMATIC FIELD CURVES) of the zoom optical system 100 at different focal lengths. The S curve represents sagittal field curvature at 587.5618 nm (d-line), and the T curve represents meridional field curvature at 587.5618 nm (d-line). As can be seen from the figures, the optical system 100 exhibits minimal field curvature, with both field curvature and astigmatism well corrected across all fields of view, resulting in sharp images at the center and edges of the field of view. Figure 4 、 Figure 5 and Figure 6 The figure also includes distortion diagrams (DISTORTION) of the zoom optical system 100 at different focal lengths. As can be seen from the figure, the image deformation caused by the main beam is small, and the imaging quality of the system is excellent.

[0141] Second embodiment

[0142] See Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 and Figure 12 , Figure 7 is a schematic diagram of the zoom optical system 100 in the second embodiment in a telephoto state, Figure 8 FIG2 is a schematic diagram of the zoom optical system 100 in the second embodiment in a short-focus state. Figure 9 FIG2 is a schematic diagram of the zoom optical system 100 in a second embodiment in a mid-focus state. The zoom optical system 100 includes, from the object side to the image side, a right-angle prism 120, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, and an eighth lens L8 with positive refractive power. Figure 10 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a telephoto state according to the second embodiment. Figure 11 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a short-focus state according to the second embodiment. Figure 12 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a mid-focus state according to the second embodiment.

[0143] The object-side surface S1 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0144] The image-side surface S2 of the first lens L1 is convex at the paraxial position and concave at the circumference;

[0145] The object-side surface S3 of the second lens L2 is convex at the paraxial direction and concave at the circumference.

[0146] The image-side surface S4 of the second lens L2 is concave at the paraxial portion and convex at the circumference.

[0147] The object-side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0148] The image-side surface S6 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0149] The object-side surface S7 of the fourth lens L4 is convex at the paraxial portion and concave at the circumference.

[0150] The image-side surface S8 of the fourth lens L4 is concave at the paraxial portion and convex at the circumference.

[0151] The object-side surface S9 of the fifth lens L5 is convex at the paraxial direction and convex at the circumference.

[0152] The image-side surface S10 of the fifth lens L5 is convex at the paraxial portion and convex at the circumference.

[0153] The object-side surface S11 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0154] The image-side surface S12 of the sixth lens L6 is concave at the paraxial portion and convex at the circumference.

[0155] The object-side surface S13 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0156] The image-side surface S14 of the seventh lens L7 is concave at the paraxial portion and at the circumference.

[0157] The object-side surface S15 of the eighth lens L8 is convex at the paraxial portion and concave at the circumference.

[0158] The image-side surface S16 of the eighth lens L8 is convex at the paraxial portion and at the circumference.

[0159] The object-side surfaces and image-side surfaces of the first lens L1 and the second lens L2 are both spherical surfaces, and the object-side surfaces and image-side surfaces of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces.

[0160] The first lens L1 , the third lens L3 , the fourth lens L4 , and the eighth lens L8 are all made of plastic, and the second lens L2 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all made of glass.

[0161] In addition, various parameters of the optical system 100 are given in Table 4 and Table 5, and the definitions of the various parameters can be obtained from the first embodiment and are not repeated here.

[0162] Table 4

[0163]

[0164] Table 5

[0165]

[0166]

[0167] The relative positional relationship of each lens group of the zoom optical system 100 at different focal lengths in the second embodiment is given in the following table, and the definition of each parameter can be obtained from the first embodiment and will not be repeated here.

[0168] Variable distance Telephoto state Short focus state Middle focus state D1 1.7870 1.1100 1.4683 D2 1.0719 4.7713 2.8296 D3 7.4161 4.4737 5.8971

[0169] Furthermore, the aspheric coefficients of the image-side surface or object-side surface of each lens of the zoom optical system 100 are given in Table 6, and the definitions of each parameter therein can be obtained from the first embodiment and are not repeated here.

[0170] Table 6

[0171]

[0172] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0173] f7 / f567 -0.67 (R7+R8) / R14 1.79 fc / fd 1.66 f12 / f567 1.68 FOVc / ImgH 4.91 SD9 / SD8 1.22 TTL / (ATg2+ATg3) 43.33

[0174] In addition, by Figure 10 、 Figure 11 and Figure 12 As can be seen from the aberration diagrams in FIG, the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 at various focal lengths are well controlled, so that the zoom optical system 100 of this embodiment has good imaging quality.

[0175] Third embodiment

[0176] See Figure 13 、 Figure 14 、 Figure 15 、 Figure 16 、 Figure 17 and Figure 18 , Figure 13 is a schematic diagram of the zoom optical system 100 in the third embodiment in a telephoto state, Figure 14 FIG. 1 is a schematic diagram of the zoom optical system 100 in the third embodiment in a short-focus state. Figure 15 FIG1 is a schematic diagram of the zoom optical system 100 in a mid-focus state according to the third embodiment. The zoom optical system 100 includes, from the object side to the image side, a right-angle prism 120, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a third lens element L3 having negative refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having positive refractive power, a seventh lens element L7 having negative refractive power, and an eighth lens element L8 having positive refractive power. Figure 16From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a telephoto state according to the third embodiment. Figure 17 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a short-focus state according to the third embodiment. Figure 18 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a mid-focus state according to the third embodiment.

[0177] The object-side surface S1 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0178] The image-side surface S2 of the first lens L1 is concave at the paraxial position and convex at the circumference;

[0179] The object-side surface S3 of the second lens L2 is convex at the paraxial direction and convex at the circumference;

[0180] The image-side surface S4 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0181] The object-side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0182] The image-side surface S6 of the third lens L3 is concave at the paraxial portion and convex at the circumference.

[0183] The object-side surface S7 of the fourth lens L4 is convex at the paraxial portion and concave at the circumference.

[0184] The image-side surface S8 of the fourth lens L4 is concave at the paraxial portion and convex at the circumference.

[0185] The object-side surface S9 of the fifth lens L5 is convex at the paraxial direction and convex at the circumference.

[0186] The image-side surface S10 of the fifth lens L5 is convex at the paraxial portion and convex at the circumference.

[0187] The object-side surface S11 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0188] The image-side surface S12 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0189] The object-side surface S13 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0190] The image-side surface S14 of the seventh lens L7 is concave at the paraxial portion and at the circumference.

[0191] The object-side surface S15 of the eighth lens L8 is concave at the paraxial portion and concave at the circumference.

[0192] The image-side surface S16 of the eighth lens L8 is convex at the paraxial portion and at the circumference.

[0193] The object-side surfaces and image-side surfaces of the first lens L1 and the second lens L2 are both spherical surfaces, and the object-side surfaces and image-side surfaces of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces.

[0194] The first lens L1 , the third lens L3 , the fourth lens L4 , and the eighth lens L8 are all made of plastic, and the second lens L2 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all made of glass.

[0195] In addition, various parameters of the optical system 100 are given in Table 7 and Table 8, and the definitions of the various parameters can be obtained from the first embodiment and are not repeated here.

[0196] Table 7

[0197]

[0198]

[0199] Table 8

[0200]

[0201] The relative positional relationship of each lens group of the zoom optical system 100 at different focal lengths in the third embodiment is given in the following table, and the definition of each parameter can be obtained from the first embodiment and will not be repeated here.

[0202] Variable distance Telephoto state Short focus state Middle focus state D1 2.4010 1.2284 1.8627 D2 1.0369 5.0599 2.9719 D3 7.2363 4.4658 5.7596

[0203] Furthermore, the aspheric coefficients of the image-side surface or object-side surface of each lens of the zoom optical system 100 are given in Table 9, and the definitions of each parameter therein can be obtained from the first embodiment and are not repeated here.

[0204] Table 9

[0205]

[0206] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0207] f7 / f567 -0.59 (R7+R8) / R14 2.25 fc / fd 1.67 f12 / f567 2.30 FOVc / ImgH 4.90 SD9 / SD8 1.20 TTL / (ATg2+ATg3) 42.73

[0208] In addition, by Figure 16 、 Figure 17 and Figure 18As can be seen from the aberration diagrams in FIG, the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 at various focal lengths are well controlled, so that the zoom optical system 100 of this embodiment has good imaging quality.

[0209] Fourth embodiment

[0210] See Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 、 Figure 23 and Figure 24 , Figure 19 FIG4 is a schematic diagram of the zoom optical system 100 in the fourth embodiment in a telephoto state. Figure 20 FIG4 is a schematic diagram of the zoom optical system 100 in the fourth embodiment in a short-focus state. Figure 21 FIG4 is a schematic diagram of the zoom optical system 100 in a mid-focus state according to the fourth embodiment. The zoom optical system 100 includes, from the object side to the image side, a right-angle prism 120, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a third lens element L3 having negative refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having positive refractive power, a seventh lens element L7 having negative refractive power, and an eighth lens element L8 having positive refractive power. Figure 22 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a telephoto state according to the fourth embodiment. Figure 23 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a short-focus state according to the fourth embodiment. Figure 24 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in a mid-focus state according to the fourth embodiment.

[0211] The object-side surface S1 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0212] The image-side surface S2 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0213] The object-side surface S3 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0214] The image-side surface S4 of the second lens L2 is convex at the paraxial portion and concave at the circumference.

[0215] The object-side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0216] The image-side surface S6 of the third lens L3 is concave at the paraxial portion and convex at the circumference.

[0217] The object-side surface S7 of the fourth lens L4 is convex at the paraxial portion and concave at the circumference.

[0218] The image-side surface S8 of the fourth lens L4 is concave at the paraxial portion and convex at the circumference.

[0219] The object-side surface S9 of the fifth lens L5 is convex at the paraxial portion and concave at the circumference.

[0220] The image-side surface S10 of the fifth lens L5 is convex at the paraxial portion and convex at the circumference.

[0221] The object-side surface S11 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0222] The image-side surface S12 of the sixth lens L6 is concave at the paraxial portion and convex at the circumference.

[0223] The object-side surface S13 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0224] The image-side surface S14 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0225] The object-side surface S15 of the eighth lens L8 is convex at the paraxial portion and concave at the circumference.

[0226] The image-side surface S16 of the eighth lens L8 is convex at the paraxial portion and at the circumference.

[0227] The object-side surfaces and image-side surfaces of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , the seventh lens L7 , and the eighth lens L8 are all aspherical surfaces.

[0228] The first lens L1 , the third lens L3 , the fourth lens L4 , and the eighth lens L8 are all made of plastic, and the second lens L2 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all made of glass.

[0229] In addition, various parameters of the optical system 100 are given in Table 10 and Table 11, and the definitions of the various parameters can be obtained from the first embodiment and are not repeated here.

[0230] Table 10

[0231]

[0232]

[0233] Table 11

[0234]

[0235] The relative positional relationship of each lens group in the zoom optical system 100 at different focal lengths in the fourth embodiment is given in the following table, and the definitions of each parameter therein can be derived from the first embodiment and are not repeated here.

[0236] Variable distance Telephoto state Short focus state Middle focus state D1 2.0017 0.8966 1.4590 D2 1.0572 5.2199 3.1805 D3 7.4075 4.4299 5.7469

[0237] Furthermore, the aspheric coefficients of the image-side surface or object-side surface of each lens of the zoom optical system 100 are given in Table 12, and the definitions of each parameter therein can be obtained from the first embodiment and are not repeated here.

[0238] Table 12

[0239]

[0240] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0241] f7 / f567 -0.70 (R7+R8) / R14 1.67 fc / fd 1.74 f12 / f567 1.92 FOVc / ImgH 4.70 SD9 / SD8 1.19 TTL / (ATg2+ATg3) 47.33

[0242] In addition, by Figure 22 、 Figure 23 and Figure 24 As can be seen from the aberration diagrams in FIG, the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 at various focal lengths are well controlled, so that the zoom optical system 100 of this embodiment has good imaging quality.

[0243] Fifth embodiment

[0244] See Figure 25 、 Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 and Figure 30 , Figure 25 FIG. 1 is a schematic diagram of the zoom optical system 100 in the fifth embodiment in a telephoto state. Figure 26 FIG. 1 is a schematic diagram of the zoom optical system 100 in the fifth embodiment in a short-focus state. Figure 27 FIG1 is a schematic diagram of the zoom optical system 100 in a neutral focus state according to the fifth embodiment. The zoom optical system 100 includes, from the object side to the image side, a right-angle prism 120, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a third lens element L3 having negative refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having positive refractive power, a seventh lens element L7 having negative refractive power, and an eighth lens element L8 having positive refractive power. Figure 28 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in the fifth embodiment in a telephoto state. Figure 29From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in the fifth embodiment in a short-focus state. Figure 30 From left to right are graphs of spherical aberration, astigmatism, and distortion of the zoom optical system 100 in the fifth embodiment at a mid-focus state.

[0245] The object-side surface S1 of the first lens L1 is convex at the paraxial direction and convex at the circumference;

[0246] The image-side surface S2 of the first lens L1 is convex at the paraxial position and concave at the circumference;

[0247] The object-side surface S3 of the second lens L2 is concave at the paraxial position and concave at the circumference;

[0248] The image-side surface S4 of the second lens L2 is convex at the paraxial position and convex at the circumference;

[0249] The object-side surface S5 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0250] The image-side surface S6 of the third lens L3 is concave at the paraxial position and concave at the circumference.

[0251] The object-side surface S7 of the fourth lens L4 is convex at the paraxial portion and convex at the circumference.

[0252] The image-side surface S8 of the fourth lens L4 is concave at the paraxial portion and convex at the circumference.

[0253] The object-side surface S9 of the fifth lens L5 is convex at the paraxial direction and convex at the circumference.

[0254] The image-side surface S10 of the fifth lens L5 is convex at the paraxial portion and convex at the circumference.

[0255] The object-side surface S11 of the sixth lens L6 is convex at the paraxial portion and convex at the circumference.

[0256] The image-side surface S12 of the sixth lens L6 is concave at the paraxial portion and convex at the circumference.

[0257] The object-side surface S13 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0258] The image-side surface S14 of the seventh lens L7 is concave at the paraxial portion and concave at the circumference.

[0259] The object-side surface S15 of the eighth lens L8 is concave at the paraxial portion and convex at the circumference.

[0260] The image-side surface S16 of the eighth lens L8 is convex at the paraxial portion and concave at the circumference.

[0261] The object-side surfaces and image-side surfaces of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , the seventh lens L7 , and the eighth lens L8 are all aspherical surfaces.

[0262] The first lens L1 , the third lens L3 , the fourth lens L4 , and the eighth lens L8 are all made of plastic, and the second lens L2 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all made of glass.

[0263] In addition, various parameters of the optical system 100 are given in Table 13 and Table 14, and the definitions of the various parameters can be obtained from the first embodiment and are not repeated here.

[0264] Table 13

[0265]

[0266]

[0267] Table 14

[0268]

[0269] The relative positional relationship of each lens group in the zoom optical system 100 at different focal lengths in the fifth embodiment is given in the following table, and the definitions of each parameter therein can be derived from the first embodiment and are not repeated here.

[0270] Variable distance Telephoto state Short focus state Middle focus state D1 2.7210 0.7663 2.0150 D2 1.0281 5.9586 3.7253 D3 8.4935 5.5977 6.4224

[0271] Furthermore, the aspheric coefficients of the image-side surface or object-side surface of each lens of the zoom optical system 100 are given in Table 15, and the definitions of each parameter therein can be derived from the first embodiment and are not repeated here.

[0272] Table 15

[0273]

[0274]

[0275] Furthermore, based on the above-mentioned parameter information, the following data can be derived:

[0276] f7 / f567 -0.81 (R7+R8) / R14 1.91 fc / fd 1.81 f12 / f567 2.24 FOVc / ImgH 4.52 SD9 / SD8 1.17 TTL / (ATg2+ATg3) 97.54

[0277] In addition, by Figure 28 、 Figure 29 and Figure 30 As can be seen from the aberration diagrams in FIG, the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 at various focal lengths are well controlled, so that the zoom optical system 100 of this embodiment has good imaging quality.

[0278] See Figure 31 In some embodiments, the zoom optical system 100 can be assembled with a photosensitive element 210 to form a zoom imaging module 200. In this case, the photosensitive surface of the photosensitive element 210 can be considered as the image plane S19 of the zoom optical system 100. The zoom imaging module 200 can also be provided with an infrared cutoff filter L9, which is disposed between the image-side surface S16 of the eighth lens L8 and the image plane S19. Specifically, the photosensitive element 210 can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) sensor. The above-mentioned zoom optical system 100 is adopted in the zoom imaging module 200. The third lens group L567 can balance the spherical aberration generated by the first lens group L12 and the second lens group L34. The seventh lens L7 can provide a reasonable negative refractive power for the zoom optical system 100, thereby improving the imaging quality of the zoom imaging module 200. It is also conducive to the miniaturization design of the zoom imaging module 200.

[0279] See Figure 31 and Figure 32 In some embodiments, the zoom imaging module 200 can be used in an electronic device 300, which includes a housing 310, and the zoom imaging module 200 is disposed in the housing 310. Specifically, the electronic device 300 can be, but is not limited to, a portable phone, a video phone, a smartphone, an e-book reader, a driving recorder, or other vehicle-mounted imaging device, or a wearable device such as a smart watch. When the electronic device 300 is a smartphone, the housing 310 can be the middle frame of the electronic device 300. Using the zoom imaging module 200 in the electronic device 300 is beneficial to improving the imaging quality of the electronic device 300 and is also beneficial to the miniaturization design of the electronic device 300.

[0280] It should be noted that in Figure 31 and Figure 32In the illustrated embodiment, the zoom optical system 100 may further include a right-angle prism 120, disposed on the object side of the first lens group L12. The right-angle prism 120 can alter the optical path and thereby change the installation orientation of the zoom optical system 100 within the electronic device 300. For example, in some embodiments, the right-angle lens 120 can change the direction of the optical path by 90°, allowing the zoom imaging module 200, consisting of the zoom optical system 100 and the photosensitive element 210, to be installed horizontally within the electronic device 300. That is, the optical axis 110 of the zoom optical system 100 can be perpendicular to the direction of incident light from the electronic device 300. Thus, the zoom optical system 100 constitutes a periscope optical system, and the electronic device 300 can be a periscope camera. The provision of the right-angle prism 120 facilitates reducing the thickness of the electronic device 300, thereby achieving a compact design for the electronic device 300.

[0281] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0282] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A zoom optical system, characterized in that: The zoom optical system has eight lenses with refractive power, and the zoom optical system includes, from the object side to the image side along the optical axis: a first lens group having positive refractive power, wherein the first lens group includes a first lens having positive refractive power and a second lens having refractive power; a second lens group having negative refractive power, the second lens group including a third lens having negative refractive power and a fourth lens having refractive power; a third lens group having positive refractive power, the third lens group including a fifth lens having positive refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; a fourth lens group having positive refractive power, wherein the fourth lens group includes an eighth lens having positive refractive power; The distance between each lens group of the zoom optical system on the optical axis is adjustable to achieve a change in the focal length of the zoom optical system; and during the zooming process of the zoom optical system, the first lens group and the fourth lens group are fixed, and the second lens group and the third lens group move to achieve zooming; and when the zoom optical system zooms from the short focal end to the long focal end, the distance between the first lens group and the second lens group increases, and the distance between the third lens group and the fourth lens group increases; the zoom optical system satisfies the following conditional formula: -0.81≤f7 / f567≤-0.2; Wherein, f7 is the effective focal length of the seventh lens, and f567 is the effective focal length of the third lens group.

2. The zoom optical system according to claim 1, wherein: The following conditions are met: 1.81≥fc / fd≥1.4; Wherein, fc is the effective focal length of the zoom optical system at the long focal length end, and fd is the effective focal length of the zoom optical system at the short focal length end.

3. The zoom optical system according to claim 1, wherein: The following conditions are met: 3.5° / mm≤FOVc / ImgH≤6° / mm; Wherein, FOVc is the maximum field of view angle of the zoom optical system at the telephoto end, and ImgH is the radius of the maximum effective imaging circle of the zoom optical system.

4. The zoom optical system according to claim 1, wherein: The following conditions are met: 15≤TTL / (ATg2+ATg3)≤150; Wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the zoom optical system, ATg2 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens, and ATg3 is the sum of the air spaces on the optical axis between adjacent lenses in the third lens group.

5. The zoom optical system according to claim 1, wherein: The following conditions are met: 1≤(R7+R8) / R14≤4; Wherein, R7 is the curvature radius of the object side surface of the fourth lens at the optical axis, R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, and R14 is the curvature radius of the image side surface of the seventh lens at the optical axis.

6. The zoom optical system according to claim 1, wherein: The following conditions are met: 0.4≤f12 / f567≤4; Wherein, f12 is the effective focal length of the first lens group, and f567 is the effective focal length of the third lens group; The object side surface of the first lens is convex at the paraxial position; The object side surface of the third lens is concave at the paraxial position, and the image side surface of the third lens is concave at the paraxial position; The object side surface of the fourth lens is convex at the paraxial position, and the image side surface of the fourth lens is concave at the paraxial position; The object-side surface of the fifth lens is convex at the paraxial position, and the image-side surface of the fifth lens is convex at the paraxial position; The object side surface of the sixth lens is convex at the paraxial position; The object-side surface of the seventh lens is concave at the paraxial position, and the image-side surface of the seventh lens is concave at the paraxial position; The image-side surface of the eighth lens is convex at the paraxial position.

7. The zoom optical system according to claim 1, wherein: When the zoom optical system is at the telephoto end, the image-side surface of the fourth lens serves as the aperture stop of the zoom optical system. When the zoom optical system is at the short focal length, the object-side surface of the fifth lens serves as the aperture stop of the zoom optical system. The zoom optical system satisfies the following conditional equation: 1.01≤SD9 / SD8≤1.5; SD9 is half of the maximum effective aperture of the object side surface of the fifth lens, and SD8 is half of the maximum effective aperture of the image side surface of the fourth lens.

8. The zoom optical system according to any one of claims 1 to 7, wherein: It also includes a reflective element, which is arranged on the object side of the first lens and is used to change the direction of the light path.

9. A zoom imaging module, characterized in that: The invention comprises a photosensitive element and the zoom optical system according to any one of claims 1 to 8, wherein the photosensitive element is arranged on the image side of the zoom optical system.

10. An electronic device, characterized in that: It comprises a shell and the zoom imaging module according to claim 9, wherein the zoom imaging module is arranged in the shell.

Images