WO2022141496A1 - Optical zoom system, zoom image capture module and electronic device - Google Patents

Abstract

An optical zoom system (100), comprising: a first lens group (L12) having a positive refractive power, wherein the first lens group (L12) comprises a first lens (L1) and a second lens (L2); a second lens group (L34) having a negative refractive power, wherein the second lens group (L34) comprises a third lens (L3) and a fourth lens (L4); a third lens group (L567) having a positive refractive power, wherein the third lens group (L567) comprises a fifth lens (L5), a sixth lens (L6) and a seventh lens (L7); and a fourth lens group having a positive refractive power, wherein the fourth lens group comprises an eighth lens (L8). The on-optical-axis (110) distances between the lens groups of the optical zoom system (100) are adjustable, so as to realize focal length changes of the optical zoom system (100). The optical zoom system (100) satisfies the following conditional expression: f7/f567 ≤ -0.2.

Description

: Zoom optical system, zoom imaging module and electronic equipment technical field

The invention relates to the field of imaging, in particular to a zoom optical system, a zoom imaging module and an electronic device.

Background technique

With the development of the imaging field, periscope imaging equipment has appeared. By setting a right-angle prism on the object side of the optical system that can change the direction of the light path, the optical system can be placed laterally in the casing of the periscope imaging equipment during installation. In this way, the periscope camera device can also have the characteristics of a high zoom ratio while realizing a miniaturized design.

However, the imaging quality of the current periscope camera equipment still needs to be improved.

SUMMARY OF THE INVENTION

According to various embodiments of the present application, a zoom optical system, a zoom imaging module, and an electronic device are provided.

A zoom optical system, comprising in sequence along an optical axis from an object side to an image side:

a first lens group having a positive refractive power, the first lens group comprising a first lens having a refractive power and a second lens having a refractive power;

a second lens group with negative refractive power, the second lens group including a third lens with refractive power and a fourth lens with refractive power;

a third lens group with positive refractive power, the third lens group including a fifth lens with refractive power, a sixth lens with refractive power, and a seventh lens with refractive power;

a fourth lens group having a positive refractive power, the fourth lens group comprising an eighth lens having a refractive power;

Wherein, the distance on the optical axis between each lens group of the zoom optical system is adjustable, so as to realize the change of the focal length of the zoom optical system;

And the zoom optical system satisfies the following conditional formula:

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, that is, the combined focal length of the fifth lens, the sixth lens and the seventh lens.

A zoom imaging module includes a photosensitive element and the zoom optical system according to any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the zoom optical system.

An electronic device includes a casing and the above-mentioned zooming and imaging module, wherein the zooming and imaging module is arranged on the casing.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below. Other features, objects and advantages of the present invention will become apparent from the description, drawings and claims.

Description of drawings

In order to better describe and illustrate embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the drawings should not be construed as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the best mode presently understood of these inventions.

1 is a schematic structural diagram of a zoom optical system in a telephoto state in a first embodiment of the application;

2 is a schematic structural diagram of the zoom optical system in a short focus state according to the first embodiment of the application;

3 is a schematic structural diagram of the zoom optical system in a middle focus state in the first embodiment of the application;

4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a telephoto state in the first embodiment of the application;

5 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a short focus state in the first embodiment of the application;

6 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a medium focus state in the first embodiment of the application;

7 is a schematic structural diagram of the zoom optical system in a telephoto state in the second embodiment of the application;

8 is a schematic structural diagram of the zoom optical system in a short focus state in the second embodiment of the application;

9 is a schematic structural diagram of the zoom optical system in a middle focus state in the second embodiment of the application;

10 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a telephoto state according to the second embodiment of the application;

11 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a short-focus state according to the second embodiment of the application;

12 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a middle focus state according to the second embodiment of the application;

13 is a schematic structural diagram of the zoom optical system in a telephoto state in the third embodiment of the application;

14 is a schematic structural diagram of the zoom optical system in a short focus state in the third embodiment of the application;

15 is a schematic structural diagram of the zoom optical system in a middle focus state in the third embodiment of the application;

16 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a telephoto state according to the third embodiment of the application;

17 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a short focus state in the third embodiment of the application;

18 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a middle focus state in the third embodiment of the application;

19 is a schematic structural diagram of the zoom optical system in a telephoto state in the fourth embodiment of the application;

20 is a schematic structural diagram of the zoom optical system in a short focus state in the fourth embodiment of the application;

21 is a schematic structural diagram of the zoom optical system in a middle focus state according to the fourth embodiment of the application;

22 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a telephoto state according to the fourth embodiment of the application;

23 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a short focus state in the fourth embodiment of the application;

24 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a middle focus state according to the fourth embodiment of the application;

25 is a schematic structural diagram of the zoom optical system in a telephoto state in the fifth embodiment of the application;

26 is a schematic structural diagram of the zoom optical system in a short focus state in the fifth embodiment of the application;

27 is a schematic structural diagram of the zoom optical system in a middle focus state in the fifth embodiment of the application;

28 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a telephoto state according to the fifth embodiment of the application;

29 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a short focus state according to the fifth embodiment of the application;

30 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the zoom optical system in a middle focus state according to the fifth embodiment of the application;

31 is a schematic structural diagram of a zoom imaging module in an embodiment of the application;

FIG. 32 is a schematic structural diagram of an electronic device in an embodiment of the present application.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

Referring to FIG. 1 , in some embodiments of the present application, the zoom optical system 100 sequentially includes a first lens group L12 , a second lens group L34 , a third lens group L567 and a fourth lens group along the optical axis 110 from the object side to the image side. 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 S1 and an image side S2, the second lens L2 includes an object side S3 and an image side S4, the third lens L3 includes an object side S5 and an image side S6, and the fourth lens L4 includes an object side S7 and the image side S8, the fifth lens L5 includes the object side S9 and the image side S10, the sixth lens L6 includes the object side S11 and the image side S12, the seventh lens L7 includes the object side S13 and the image side S14, and the eighth lens L8 includes the object side S13 and the image side S14. Side S15 and like side S16.

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.

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 can move along the optical axis 110, thereby realizing zoom optics The zoom function of the system 100 enables the zoom optical system 100 to have a telephoto state, a medium focus state and a short focus state, wherein the effective focal length of the zoom optical system 100 in the telephoto state, the medium focus state and the short focus state decreases sequentially . And when the zoom optical system 100 is at the telephoto end, the effective focal length of the zoom optical system 100 is the largest, and when the zoom optical system 100 is at the short focal end, the effective focal length of the zoom optical system 100 is the smallest. It can be 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, and 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, the second lens group L34 in some embodiments may move synchronously with the third lens group L567, or may also move asynchronously.

For example, in some embodiments, the second lens group L34 moves along the optical axis 110 away from the first lens group L12, and the third lens group L34 moves along the optical axis 110 toward the fourth lens group, so that The effective focal length of the zoom optical system 100 is changed, and the zoom function of the zoom optical system 100 is realized. In some embodiments, when the second lens group L34 moves away from the first lens group L12 along the optical axis 110, that is, the distance between the first lens group L12 and the second lens group L34 increases, the third lens group When the L567 moves along the optical axis 110 in a direction away from the fourth lens group, that is, when 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 Transition from a short focus state to a medium focus state, or from a medium focus state to a telephoto state.

It should be noted that, in the present application, the telephoto state, mid-focus state, and short-focus state of the zoom optical system 100 are only examples of the partial focal length states of the zoom optical system 100 . Changes in the relative positions of the second lens group L34 and the third lens L567 and the first lens group L12 and the fourth lens, 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 .

In some embodiments, the zoom optical system 100 may be used in a zoom lens (not shown in the figure), and 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, the zoom ring and the fixed focus ring are arranged between the first lens group L12 and the fourth lens group, and the zoom ring is fixedly connected with the second lens group L34, and the fixed focus ring is fixed. The focal ring is fixedly connected with 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 , so as to realize the zoom function of the zoom lens. Of course, the zoom function of the zoom lens can also be implemented in other ways, 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, here No longer.

In addition, in some embodiments, the zoom optical system 100 further includes an infrared cut filter L9 disposed on the image side of the eighth lens L8, and the infrared cut filter L9 includes an object side S17 and an image side S18. Further, the zoom optical system 100 further includes an image surface S19 located on the image side of the eighth lens L8, and the incident light passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the third lens The six lenses L6, the seventh lens L7 and the eighth lens L8 can form an image on the image plane S19 after adjustment. The infrared cut-off filter L9 is used to filter out interference light to prevent the interference light from reaching the image plane S19 of the zoom optical system 100 and affecting normal imaging.

In some embodiments, the object side surface and the image side surface of each lens of the zoom optical system 100 are aspherical. The use of the aspherical structure can improve the design flexibility of each lens and effectively correct the spherical aberration of the zoom optical system 100. Improve image quality. In other embodiments, the object side surface and the image side surface of each lens of the optical system 100 may also be spherical surfaces. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surfaces of the lenses in the zoom optical system 100 may be aspherical or any combination of spherical surfaces.

In some embodiments, the material of each lens in the zoom optical system 100 may be glass or plastic. Using a lens made of a plastic material such as polycarbonate can reduce the weight and production cost of the zoom optical system 100 , and using a glass material lens can make the zoom optical system 100 have excellent optical performance and higher temperature resistance. In addition, the material of each lens of the zoom optical system 100 may be any combination of glass and plastic, not necessarily all glass or all plastics.

It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there may also be two or more lenses in the first lens L1, and the two or more lenses can form a cemented lens. The surface of the cemented lens closest to the object side can be regarded as the object side S1, and the surface closest to the image side can be regarded as the image side S2. Alternatively, a cemented lens is not formed between the lenses in the first lens L1, but the distance between the lenses is relatively fixed. In this case, the object side of the lens closest to the object side is the object side S1, and the lens closest to the image side The image side is the image side S2. In addition, 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 in some embodiments may also be greater than or equal to Two lenses, and any adjacent lenses can form a cemented lens or a non-cemented lens.

In some embodiments, the zoom optical system 100 may further include a right angle prism 120. The right angle prism 120 may be made of glass or plastic. The right angle prism 120 is disposed on the object side of the first lens group L12 for changing the direction of the light path. And in some embodiments, the right angle prism 120 can change the direction of the light path by 90°. At this time, the zoom optical system 100 constitutes a periscope optical system, and the zoom optical system 100 can be applied to smart phones, tablet computers, etc. In the periscope electronic device with the lens design. The right angle prism 120 includes a first surface Sa, a second surface Sb and a third surface Sc, the angle between the second surface Sb and the optical axis 110 is 90°, and the second surface Sb can reflect light to change the direction of the light path. The light enters the right angle prism 120 from the first surface Sa, is reflected by the second surface Sb, and exits from the third surface Sc, and then enters the first lens group L12. Of course, in other embodiments, the zoom optical system 100 can also use other reflective elements to replace the right angle prism 120, as long as it can play the role of changing the direction of the optical path.

Further, in some embodiments, the zoom optical system 100 satisfies the conditional formula: f7/f567≤-0.2; wherein, f7 is the effective focal length of the seventh lens L7, and f567 is the effective focal length of the third lens group L567. Specifically, f7/f567 may be: -0.81, -0.79, -0.78, -0.75, -0.73, -0.70, -0.64, -0.62, -0.60, or -0.59. The seventh lens L7 provides negative refractive power for the third lens group L567. When the above conditional expression is satisfied, the negative refractive power of the seventh lens L7 in the third lens group L567 can be reasonably configured, which is beneficial to the third lens group L567. Balance the spherical aberration generated by the first lens group L12 and the second lens group L34; at the same time, the seventh lens L7 can provide a reasonable negative refractive power for the zoom optical system 100 to improve the imaging quality of the zoom optical system 100. In addition, the third lens The effective focal length of the lens group L567 can be controlled within a small range, thereby increasing the refractive power of the third lens group L567, so that the third lens group L567 can effectively focus the light at the rear end of the zoom optical system 100, thereby helping to shorten the zoom optical system 100 total system length. When f7/f567>-0.2, the refractive power of each lens of the third lens group L567 is unevenly distributed, which is not conducive to the third lens group L567 to correct the aberrations generated by the first lens group L12 and the second lens group L34.

In some embodiments, the zoom optical system 100 satisfies the conditional formula: fc/fd≥1.4; wherein, 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 end. Specifically, fc/fd may be: 1.66, 1.68, 1.70, 1.71, 1.73, 1.76, 1.77, 1.78, 1.80 or 1.81. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the zoom optical system 100 at the telephoto end and at the short focal end can be reasonably configured, so that the zoom optical system 100 can obtain a higher zoom ratio, thereby achieving 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 large-scale shooting.

In some embodiments, the zoom optical system 100 satisfies the conditional formula: 3.5≤FOVc/ImgH≤6; wherein, FOVc is the maximum field angle of the zoom optical system 100 at the telephoto end, in degrees, and ImgH is the maximum angle of view of the zoom optical system 100 The radius of the largest effective imaging circle, in mm. Specifically, FOVc/ImgH may be: 4.52, 4.58, 4.60, 4.61, 4.67, 4.69, 4.70, 4.73, 4.77, or 4.91, and the numerical unit is °/mm. When the above conditional expression is satisfied, the ratio of the full field of view and the half-image height of the zoom optical system 100 at the telephoto end can be reasonably configured, which is beneficial to realize the telephoto characteristic of the zoom optical system 100, and at the same time, the zoom optical system 100 has a large size. The image plane can be matched with a higher pixel photosensitive element to achieve high-definition shooting.

It should be noted that, in the present application, the zoom optical system 100 may match a photosensitive element having a rectangular photosensitive surface, and the imaging surface of the zoom optical system 100 and the photosensitive surface of the photosensitive element overlap. At this time, 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 .

In some embodiments, the zoom optical system 100 satisfies the conditional formula: 15≤TTL/(ATg2+ATg3)≤150; wherein, TTL is the object side S1 of the first lens L1 to the imaging plane of the zoom optical system 100 on the optical axis 110 The distance above, ATg2 is the distance from the image side S6 of the third lens L3 to the object side S9 of the fourth lens L4 on the optical axis 110, and ATg3 is the distance between the adjacent lenses in the third lens group L567 on the optical axis 110 The sum of the air intervals. Specifically, TTL/(ATg2+ATg3) may 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-mentioned conditional expression is satisfied, the total optical length of the zoom optical system 100 and the sum of the air intervals on the optical axis 110 between the adjacent lenses in the second lens group L34 and the third lens group L567 can be reasonably configured. The large zoom ratio of the zoom optical system 100 is beneficial to shorten the overall system length of the zoom optical system 100 , thereby realizing the miniaturized design of 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 too large, which tends to increase the pressure on the space configuration of the electronic device equipped with the zoom optical system 100, which is not conducive to the miniaturization design of the electronic device, and also reduces the zoom optical system. 100 itself is stable.

In some embodiments, the zoom optical system 100 satisfies the conditional formula: 1≤(R7+R8)/R14≤4; wherein, R7 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis 110, and R8 is the first The radius of curvature of the image side S8 of the fourth lens L4 at the optical axis 110 , and R14 is the radius of curvature of the image side S14 of the seventh lens L7 at the optical axis 110 . Specifically, (R7+R8)/R14 may 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 expressions are satisfied, the curvature radius of the second lens of the second lens group L34 and the curvature radius of the image side surface S14 of the seventh lens group L7 can be reasonably configured, which is beneficial to suppress the aberration generated by the second lens group L34, The aberration distribution between the second lens group L34 and the lens groups on the object side and the image side reaches a balanced state, thereby improving the imaging quality of the zoom optical system 100; The surface shape of L4 will not be excessively curved, thereby reducing the difficulty of forming and processing the fourth lens L4, and at the same time, the surface shape of the fourth lens will not be too smooth, so that the fourth lens has a suitable deflection ability for light.

In some embodiments, the zoom optical system 100 satisfies the conditional formula: 0.4≤f12/f567≤4; wherein, 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 may 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 expression is satisfied, 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, and can also be used for the first lens group L12. The positive refractive power borne by the third lens group L567 and the third lens group L567 are reasonably configured, and the negative refractive power contributed by the second lens group L34 is matched, so that the movement of the second lens group L34 and the third lens group L567 along the optical axis 110 can realize the zoom optical system. 100 different focal lengths in three states, so as to realize the zoom characteristics of the zoom optical system 100 .

In some embodiments, when the zoom optical system 100 is at the telephoto end, the image side S8 of the fourth lens L4 is the aperture stop of the zoom optical system 100, and when the zoom optical system 100 is at the short focal end, the fifth lens L5 The object side S9 is the aperture stop of the zoom optical system 100, and the zoom optical system 100 satisfies the conditional formula: 1.01≤SD9/SD8≤1.5; wherein, SD9 is half of the maximum effective aperture of the object side S9 of the fifth lens L5, SD8 is half of the maximum effective aperture of the image side surface S8 of the fourth lens L4. Specifically, SD9/SD8 may be: 1.17, 1.18, 1.19, 1.20, 1.21 or 1.22. When the above conditional expressions are satisfied, the aperture diaphragm of the zoom optical system 100 can block the marginal field of view light when the zoom optical system 100 is at the short focal end, thereby reducing the generation of distortion and astigmatism, thereby reducing the image generated by the zoom optical system 100. poor, the optical performance of the zoom optical system 100 is improved. When the upper limit of the above-mentioned conditional expression is exceeded, the aberration sensitivity of the zoom optical system 100 is likely to increase, and the optical performance of the zoom optical system 100 is likely to be degraded.

Based on the descriptions of the above embodiments, more specific embodiments and accompanying drawings are provided below for detailed description.

first embodiment

1 , 2 , 3 , 4 , 5 and 6 , FIG. 1 is a schematic diagram of the zoom optical system 100 in the first embodiment in a telephoto state, and FIG. 2 is the first embodiment FIG. 3 is a schematic diagram of the zoom optical system 100 in a short focus state, and FIG. 3 is a schematic diagram of the zoom optical system 100 in a medium focus state in the first embodiment. The zoom optical system 100 includes a right angle prism 120, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a positive refractive power The fourth lens L4, the fifth lens L5 with positive refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with negative refractive power, and the eighth lens L8 with positive refractive power. FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the zoom optical system 100 in a telephoto state in the first embodiment from left to right, and FIG. 5 is a zoom in the first embodiment from left to right The graph of spherical aberration, astigmatism and distortion of the optical system 100 in a short focal state, FIG. 6 is the spherical aberration, astigmatism and distortion of the zoom optical system 100 in the first embodiment in a medium focal state from left to right Curve diagrams of astigmatism and distortion, wherein the reference wavelengths of the astigmatism diagram and the distortion diagram of the zoom optical system 100 in three states are both 587.56 nm, and other embodiments are the same.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S3 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position and convex at the circumference;

The object side surface S5 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S8 of the fourth lens L4 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S12 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S14 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S15 of the eighth lens L8 is a concave surface at the paraxial position and a convex surface at the circumference;

The image side surface S16 of the eighth lens L8 is convex at the paraxial position and convex at the circumference.

The object and image sides 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 aspherical.

It should be noted that, in this application, when one surface of the lens is described as convex at the paraxial position (the central area of the side surface), it can be understood that the area of the surface of the lens near the optical axis 110 is convex. When it is described that a surface of a lens is concave at the circumference, it is understood that the area of the surface near the maximum effective radius is concave. For example, when the surface is convex at the paraxial position and also convex at the circumference, the shape of the surface from the center (optical axis 110) to the edge direction may be purely convex; or a convex surface from the center first The shape transitions to a concave shape and then becomes convex near the maximum effective radius. This is only an example for illustrating the relationship between the optical axis 110 and the circumference. Various shapes and structures of the surface (concave-convex relationship) are not fully reflected, but other situations can be derived from the above examples.

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 made of glass.

Further, the zoom optical system 100 satisfies the conditional formula: f7/f567=−0.66; wherein, f7 is the effective focal length of the seventh lens L7, and f567 is the effective focal length of the third lens group L567. The seventh lens L7 provides negative refractive power for the third lens group L567. When the above conditional expression is satisfied, the negative refractive power of the seventh lens L7 in the third lens group L567 can be reasonably configured, which is beneficial to the third lens group L567. Balance the spherical aberration generated by the first lens group L12 and the second lens group L34; at the same time, the seventh lens L7 can provide a reasonable negative refractive power for the zoom optical system 100 to improve the imaging quality of the zoom optical system 100. In addition, the third lens The effective focal length of the lens group L567 can be controlled within a small range, thereby increasing the refractive power of the third lens group L567, so that the third lens group L567 can effectively focus the light at the rear end of the zoom optical system 100, thereby helping to shorten the zoom optical system 100 total system length.

The zoom optical system 100 satisfies the conditional formula: fc/fd=1.66; wherein, 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 end. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the zoom optical system 100 at the telephoto end and at the short focal end can be reasonably configured, so that the zoom optical system 100 can obtain a higher zoom ratio, thereby achieving a wider range of shooting magnifications. .

The zoom optical system 100 satisfies the conditional formula: FOVc/ImgH=4.91; wherein, FOVc is the maximum field angle of the zoom optical system 100 at the telephoto end, in degrees, and ImgH is the radius of the largest effective imaging circle of the zoom optical system 100, in units is mm. When the above conditional expression is satisfied, the ratio of the full field of view and the half image height of the zoom optical system 100 at the telephoto end can be reasonably configured, which is beneficial to realize the telephoto characteristic of the zoom optical system 100 and at the same time make the zoom optical system 100 have a large size. The image surface can be matched with a higher pixel photosensitive element to achieve high-definition shooting.

The zoom optical system 100 satisfies the conditional formula: TTL/(ATg2+ATg3)=56.43; wherein, TTL is the distance from the object side S1 of the first lens L1 to the imaging surface of the zoom optical system 100 on the optical axis 110, and ATg2 is the third The distance from the image side S6 of the lens L3 to the object side S9 of the fourth lens L4 on the optical axis 110, ATg3 is the sum of the air intervals on the optical axis 110 between adjacent lenses in the third lens group L567. When the above-mentioned conditional expression is satisfied, the total optical length of the zoom optical system 100 and the sum of the air intervals on the optical axis 110 between the adjacent lenses in the second lens group L34 and the third lens group L567 can be reasonably configured. The large zoom ratio of the zoom optical system 100 is beneficial to shorten the overall system length of the zoom optical system 100 , thereby realizing the miniaturized design of the zoom optical system 100 , and saving space for electronic devices equipped with the zoom optical system 100 .

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

The zoom optical system 100 satisfies the conditional formula: f12/f567=2.47; wherein, 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 the above conditional expression is satisfied, 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, and can also be used for the first lens group L12. The positive refractive power borne by the third lens group L567 and the third lens group L567 are reasonably configured, and the negative refractive power contributed by the second lens group L34 is matched, so that the movement of the second lens group L34 and the third lens group L567 along the optical axis 110 can realize the zoom optical system. 100 different focal lengths in three states, so as to realize the zoom characteristics of the zoom optical system 100 .

When the zoom optical system 100 is at the telephoto end, the image side S8 of the fourth lens L4 is the aperture stop of the zoom optical system 100, and when the zoom optical system 100 is at the short focal end, the object side S9 of the fifth lens L5 is the zoom The aperture stop of the optical system 100, and the zoom optical system 100 satisfies the conditional formula: SD9/SD8=1.21; wherein, SD9 is half of the maximum effective aperture of the object side S9 of the fifth lens L5, SD8 is the image of the fourth lens L4 Half of the maximum effective caliber of the side S8. When the above conditional expressions are satisfied, the aperture diaphragm of the zoom optical system 100 can block the marginal field of view light when the zoom optical system 100 is at the short focal end, thereby reducing the generation of distortion and astigmatism, thereby reducing the image generated by the zoom optical system 100. poor, the optical performance of the zoom optical system 100 is improved. When the upper limit of the above-mentioned conditional expression is exceeded, the aberration sensitivity of the zoom optical system 100 is likely to increase, and the optical performance of the zoom optical system 100 is likely to be degraded.

In addition, various parameters of the zoom optical system 100 are given by Table 1 and Table 2. 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 sequentially arranged in the order of the elements in Table 1 from top to bottom. The Y radius in Table 1 is the curvature radius of the object side surface or the image side surface of the corresponding surface number at the optical axis 110 . Surface number 1 and surface number 2 are the object side S1 and the image side S2 of the first lens L1 respectively, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. 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 object side of the next lens from the image side of the lens to the image side. Distance on axis 110.

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, but at this time, the distance from the image side S16 to the image plane S19 of the eighth lens L8 remains unchanged.

In the first embodiment, the effective focal length of the zoom optical system 100 at the short focal end is f=13.8mm, the effective focal length at the middle focal end is f=18.0mm, and the effective focal length at the telephoto end is f=23mm; The aperture number FNO=2.821 at the short focal end, FNO=3.11 at the mid focal end, and FNO=3.82 at the telephoto end; The maximum field of view angle FOV=24.8°, and the maximum field of view angle at the telephoto end FOV=19.6°, that is, among the values of the effective focal length, aperture number and field of view in Table 1, the first value indicates that the zoom optical system 100 is in The numerical value at the short focal end, the second numerical value indicates the numerical value at which the zoom optical system 100 is at the intermediate focal end, and the third numerical value means the numerical value at which the zoom optical system 100 is at the telephoto end, and other embodiments are the same. The total optical length of the zoom optical system 100 is TTL=25 mm.

In addition, the reference wavelengths of the focal length, refractive index and Abbe number of each lens are all 587.56 nm (d-line), and other embodiments are also the same.

Table 1

Table 2

In the first embodiment, the relative positional relationship of each lens group under different focal length states of the zoom optical system 100 is given by the following table, wherein D1 is the air interval between the first lens group L12 and the second lens group L34 on the optical axis 110 , that is, the distance from the image side S4 of the second lens L2 to the object side S5 of the third lens L3 on the optical axis 110, and D2 is the air interval between the second lens group L34 and the third lens group L567 on the optical axis 110 , D3 is the air interval between the third lens group L567 and the fourth lens group on the optical axis 110, and the numerical units of D1, D2, and D3 are all mm. As can be seen from the table below, when the second lens group L34 moves along the optical axis 110 in a direction away from the first lens group L12, and the third lens group L567 moves along the optical axis 110 in a direction away from the fourth lens group, the zoom optical system 100 The effective focal length increases.

variable distance	telephoto state	short focus	Medium focus
D1	2.6023	1.1037	2.1192
D2	1.0278	4.7870	2.7845
D3	6.6585	4.4779	5.3091

Further, 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 1-16 represent the image side or the object side S1-S16 respectively. And K-A20 from left to right respectively represent the type of aspherical coefficient, among which, K represents the conic coefficient, A4 represents the fourth-order aspherical coefficient, A6 represents the sixth-order aspherical coefficient, and A8 represents the eighth-order aspherical coefficient. analogy. In addition, the aspheric coefficient formula is as follows:

Among them, Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspherical surface to the optical axis 110, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the aspherical surface. The coefficient corresponding to the higher-order term of the i-th term in the spherical surface formula.

table 3

face order

K

A4

A6

A8

A10

A12

A14

A16

A18

A20

No
1	0.000	0.000	0.000	0.000	0.000	0.000	0	0	0	0
2	0.000	-0.001	0.000	0.000	0.000	0.000	0	0	0	0
3	0.000	-0.001	0.000	0.000	0.000	0.000	0	0	0	0
4	0.000	0.000	0.000	0.000	0.000	0.000	0	0	0	0
5	7.882E+00	-2.400E-04	5.300E-04	-1.600E-04	2.000E-05	0.000E+00	0	0	0	0
6	7.149E-01	1.080E-03	1.350E-03	-1.500E-04	1.000E-05	0.000E+00	0	0	0	0
7	7.316E-01	4.550E-03	3.700E-04	4.000E-05	0.000E+00	0.000E+00	0	0	0	0
8	-1.330E+00	3.770E-03	-3.600E-04	9.000E-05	-1.000E-05	0.000E+00	0	0	0	0
9	0.000E+00	-7.600E-04	6.000E-05	-1.000E-05	0.000E+00	0.000E+00	0	0	0	0
10	0.000E+00	5.400E-04	-5.500E-04	1.300E-04	-2.000E-05	0.000E+00	0	0	0	0
11	0.000E+00	3.090E-03	-5.800E-04	1.200E-04	-3.000E-05	0.000E+00	0	0	0	0
12	0.000E+00	1.890E-03	1.210E-03	-5.400E-04	1.000E-04	-1.000E-05	0	0	0	0
13	0.000E+00	-2.900E-04	8.500E-04	-3.400E-04	7.000E-05	-1.000E-05	0	0	0	0
14	0.000E+00	-3.030E-03	1.500E-04	-4.000E-05	1.000E-05	0.000E+00	0	0	0	0
15	-5.866E-01	1.700E-04	7.000E-05	-2.000E-05	0.000E+00	0.000E+00	0	0	0	0
16	8.321E+00	3.700E-04	6.000E-05	-2.000E-05	0.000E+00	0.000E+00	0	0	0	0

In addition, FIG. 4 , FIG. 5 and FIG. 6 include longitudinal spherical aberration diagrams (Longitudinal Spherical Aberration) of the zoom optical system 100 under different focal length states, which represent the deviation of the converging focus of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration map represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the distance from the imaging plane to the intersection of the light ray and the optical axis 110 (unit is mm) . It can be seen from the longitudinal spherical aberration diagram that in the first embodiment, the degree of deviation of the converging focus of light of each wavelength tends to be consistent, and the smear or color halo in the imaging picture is effectively suppressed. 4, 5 and 6 also include field curves (ASTIGMATIC FIELD CURVES) of the zoom optical system 100 under different focal length states, wherein the S curve represents the sagittal field curve at 587.5618 nm (d line), and the T curve represents 587.5618 Meridian field curvature at nm (d-line). It can be seen from the figure that the field curvature of the optical system 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and edge of the field of view have clear images. 4 , 5 and 6 also include distortion diagrams (DISTORTION) of the zoom optical system 100 under different focal lengths. It can be seen from the diagrams that the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.

Second Embodiment

Please refer to FIGS. 7 , 8 , 9 , 10 , 11 and 12 , FIG. 7 is a schematic diagram of the zoom optical system 100 in the second embodiment in a telephoto state, and FIG. 8 is the second embodiment FIG. 9 is a schematic diagram of the zoom optical system 100 in a short focus state, and FIG. 9 is a schematic diagram of the zoom optical system 100 in a medium focus state in the second embodiment. The zoom optical system 100 sequentially includes a right angle prism 120 from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, and a negative refractive power The fourth lens L4, the fifth lens L5 with positive refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with negative refractive power, and the eighth lens L8 with positive refractive power. 10 is a graph of spherical aberration, astigmatism and distortion of the zoom optical system 100 in a telephoto state in the second embodiment from left to right, and FIG. 11 is a zoom in the second embodiment from left to right The graph of spherical aberration, astigmatism and distortion of the optical system 100 in a short focal state, Fig. 12 shows spherical aberration, astigmatism and distortion of the zoom optical system 100 in a medium focal state in the second embodiment from left to right Graph of astigmatism and distortion.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position and convex at the circumference;

The object side surface S5 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S8 of the fourth lens L4 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S14 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S15 of the eighth lens L8 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S16 of the eighth lens L8 is convex at the paraxial position and convex at the circumference.

The object side and the image side of the first lens L1 and the second lens L2 are spherical surfaces, and the objects 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 spherical. Both the sides and the image sides are aspherical.

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 made of glass.

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

Table 4

table 5

In the second embodiment, the relative positional relationship of each lens group under different focal length states of the zoom optical system 100 is given by the following table, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

variable distance	telephoto state	short focus	Medium focus
D1	1.7870	1.1100	1.4683
D2	1.0719	4.7713	2.8296
D3	7.4161	4.4737	5.8971

Further, the aspheric coefficients of the image side or object side of each lens of the zoom optical system 100 are given in Table 6, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 6

And, according to the parameter information provided above, the following data can be inferred:

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

In addition, it can be seen from the aberration diagrams in FIG. 10 , FIG. 11 and FIG. 12 that the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 under various focal length states are well controlled, so the zoom optical system of this embodiment is well controlled. System 100 has good imaging quality.

Third Embodiment

13 , 14 , 15 , 16 , 17 and 18 , FIG. 13 is a schematic diagram of the zoom optical system 100 in the third embodiment in a telephoto state, and FIG. 14 is the third embodiment 15 is a schematic diagram of the zoom optical system 100 in the third embodiment in a medium focus state. The zoom optical system 100 includes a right angle prism 120, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a positive refractive power The fourth lens L4, the fifth lens L5 with positive refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with negative refractive power, and the eighth lens L8 with positive refractive power. 16 is a graph of spherical aberration, astigmatism and distortion of the zoom optical system 100 in a telephoto state in the third embodiment from left to right, and FIG. 17 is a zoom in the third embodiment from left to right The graph of spherical aberration, astigmatism and distortion of the optical system 100 in a short focal state, FIG. 18 is the spherical aberration, Graph of astigmatism and distortion.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S8 of the fourth lens L4 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S12 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is concave at the paraxial position, and is concave at the circumference;

The image side surface S14 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S15 of the eighth lens L8 is concave at the paraxial position, and is concave at the circumference;

The image side surface S16 of the eighth lens L8 is convex at the paraxial position and convex at the circumference.

The object side and the image side of the first lens L1 and the second lens L2 are spherical surfaces, and the objects 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 spherical. Both the sides and the image sides are aspherical.

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 made of glass.

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

Table 7

Table 8

In the third embodiment, the relative positional relationship of each lens group when the zoom optical system 100 is in different focal length states is given by the following table, and the definition of each parameter can be obtained from the first embodiment, and will not be repeated here.

variable distance	telephoto state	short focus	Medium focus
D1	2.4010	1.2284	1.8627
D2	1.0369	5.0599	2.9719
D3	7.2363	4.4658	5.7596

Further, the aspheric coefficients of the image side or object side of each lens of the zoom optical system 100 are given in Table 9, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 9

And, according to the parameter information provided above, the following data can be inferred:

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

In addition, it can be seen from the aberration diagrams in FIG. 16 , FIG. 17 and FIG. 18 that the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 under various focal length states are well controlled, so the zoom optical system of this embodiment is well controlled. System 100 has good imaging quality.

Fourth Embodiment

Please refer to FIGS. 19 , 20 , 21 , 22 , 23 and 24 , FIG. 19 is a schematic diagram of the zoom optical system 100 in the fourth embodiment in a telephoto state, and FIG. 20 is the fourth embodiment 21 is a schematic diagram of the zoom optical system 100 in the fourth embodiment in a medium focus state. The zoom optical system 100 includes a right angle prism 120, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a positive refractive power The fourth lens L4, the fifth lens L5 with positive refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with negative refractive power, and the eighth lens L8 with positive refractive power. 22 is a graph of spherical aberration, astigmatism and distortion of the zoom optical system 100 in a telephoto state in the fourth embodiment from left to right, and FIG. 23 is the zoom in the fourth embodiment from left to right The graph of spherical aberration, astigmatism and distortion of the optical system 100 in a short focal state, Fig. 24 shows the spherical aberration, astigmatism and distortion of the zoom optical system 100 in a medium focal state in the fourth embodiment from left to right Graph of astigmatism and distortion.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S3 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The image side surface S4 of the second lens L2 is a convex surface at the paraxial position and a concave surface at the circumference;

The object side surface S5 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S8 of the fourth lens L4 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S14 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S15 of the eighth lens L8 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S16 of the eighth lens L8 is convex at the paraxial position and convex at the circumference.

The object and image sides 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 aspherical.

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 made of glass.

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

Table 10

Table 11

In the fourth embodiment, the relative positional relationship of each lens group when the zoom optical system 100 is in different focal length states is given in the following table, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

variable distance	telephoto state	short focus	Medium focus
D1	2.0017	0.8966	1.4590
D2	1.0572	5.2199	3.1805
D3	7.4075	4.4299	5.7469

Further, the aspheric coefficients of the image side or object side of each lens of the zoom optical system 100 are given in Table 12, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 12

And, according to the parameter information provided above, the following data can be inferred:

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

In addition, it can be seen from the aberration diagrams in FIG. 22 , FIG. 23 and FIG. 24 that the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 under various focal length states are well controlled, so the zoom optical system of this embodiment is well controlled. System 100 has good imaging quality.

Fifth Embodiment

25 , 26 , 27 , 28 , 29 and 30 , FIG. 25 is a schematic diagram of the zoom optical system 100 in the fifth embodiment in a telephoto state, and FIG. 26 is the fifth embodiment 27 is a schematic diagram of the zoom optical system 100 in the fifth embodiment in a medium focus state. The zoom optical system 100 includes a right angle prism 120, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a positive refractive power The fourth lens L4, the fifth lens L5 with positive refractive power, the sixth lens L6 with positive refractive power, the seventh lens L7 with negative refractive power, and the eighth lens L8 with positive refractive power. 28 is a graph of spherical aberration, astigmatism and distortion of the zoom optical system 100 in a telephoto state in the fifth embodiment from left to right, and FIG. 29 is a zoom in the fifth embodiment from left to right The graph of spherical aberration, astigmatism and distortion of the optical system 100 in a short focal state, FIG. 30 is the spherical aberration, Graph of astigmatism and distortion.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S3 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The image side surface S4 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S5 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position, and is concave at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S8 of the fourth lens L4 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S14 of the seventh lens L7 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The object side surface S15 of the eighth lens L8 is a concave surface at the paraxial position and a convex surface at the circumference;

The image side surface S16 of the eighth lens L8 is convex at the paraxial position and concave at the circumference.

The object and image sides 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 aspherical.

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 made of glass.

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

Table 13

Table 14

In the fifth embodiment, the relative positional relationship of each lens group under different focal length states of the zoom optical system 100 is given by the following table, and the definition of each parameter can be obtained from the first embodiment, which will not be repeated here.

variable distance	telephoto state	short focus	Medium focus
D1	2.7210	0.7663	2.0150
D2	1.0281	5.9586	3.7253
D3	8.4935	5.5977	6.4224

Further, the aspheric coefficients of the image side or object side of each lens of the zoom optical system 100 are given in Table 15, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 15

And, according to the parameter information provided above, the following data can be inferred:

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

In addition, it can be seen from the aberration diagrams in FIG. 28 , FIG. 29 and FIG. 30 that the longitudinal spherical aberration, field curvature and distortion of the zoom optical system 100 under various focal length states are well controlled, so the zoom optical system of this embodiment is well controlled. System 100 has good imaging quality.

Referring to FIG. 31 , in some embodiments, the zoom optical system 100 can be assembled with the photosensitive element 210 to form the zoom imaging module 200 . At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the image surface S19 of the zoom optical system 100 . The zoom imaging module 200 may also be provided with an infrared cut filter L9, and the infrared cut filter L9 is disposed between the image side S16 and the image surface S19 of the eighth lens L8. Specifically, the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The zoom optical system 100 is used 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, and the seventh lens L7 can provide a reasonable solution for the zoom optical system 100. Therefore, the image quality of the zoom and imaging module 200 is improved, and the miniaturized design of the zoom imaging module 200 is also facilitated.

Please refer to FIG. 31 and FIG. 32 , in some embodiments, the zoom imaging module 200 can be applied to an electronic device 300, the electronic device includes a housing 310, and the zoom imaging module 200 is disposed in the housing 310. Specifically, the electronic device 300 may be, but is not limited to, a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted camera device such as a driving recorder, or a wearable device such as a smart watch. When the electronic device 300 is a smart phone, the housing 310 may be a middle frame of the electronic device 300 . The use of the zoom imaging module 200 in the electronic device 300 is conducive to improving the imaging quality of the electronic device 300 and is also conducive to the miniaturized design of the electronic device 300 .

It should be noted that, in the embodiments shown in FIGS. 31 and 32 , the zoom optical system 100 may further include a right-angle prism 120 . The right-angle prism 120 is disposed on the object side of the first lens group L12 , and the right-angle lens 120 can change the optical path. The wiring further changes the installation direction of the zoom optical system 100 in the electronic device 300 . For example, in some embodiments, the right-angle lens 120 can change the direction of the optical path by 90°, then the zoom imaging module 200 composed of the zoom optical system 100 and the photosensitive element 210 can be installed in the electronic device 300 laterally, that is, the zoom optical system The optical axis 110 of the electronic device 300 may be perpendicular to the incident light direction of the electronic device 300 . Therefore, the zoom optical system 100 constitutes a periscope optical system, and the electronic device 300 can be a periscope camera device. The arrangement of the right angle prism 120 is beneficial to reduce the thickness of the electronic device 300 and realize the miniaturization of the electronic device 300 design.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (20)

1. A zoom optical system, comprising in sequence along an optical axis from an object side to an image side:

   a first lens group having a positive refractive power, the first lens group comprising a first lens having a refractive power and a second lens having a refractive power;

   a second lens group with negative refractive power, the second lens group including a third lens with refractive power and a fourth lens with refractive power;

   a third lens group with positive refractive power, the third lens group including a fifth lens with refractive power, a sixth lens with refractive power, and a seventh lens with refractive power;

   a fourth lens group having a positive refractive power, the fourth lens group comprising an eighth lens having a refractive power;

   Wherein, the distance on the optical axis between each lens group of the zoom optical system is adjustable, so as to realize the change of the focal length of the zoom optical system;

   And the zoom optical system satisfies the following conditional formula:

   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 conditional formula is satisfied:

   fc/fd≥1.4;

   Wherein, fc is the effective focal length of the zoom optical system at the telephoto end, and fd is the effective focal length of the zoom optical system at the short focal end.
3. The zoom optical system according to claim 1, wherein the following conditional formula is satisfied:

   3.5°/mm≤FOVc/ImgH≤6°/mm;

   Wherein, FOVc is the maximum field angle of the zoom optical system at the telephoto end, and ImgH is the radius of the largest effective imaging circle of the zoom optical system.
4. The zoom optical system according to claim 1, wherein the following conditional formula is satisfied:

   15≤TTL/(ATg2+ATg3)≤150;

   Wherein, TTL is the distance from the object side of the first lens to the imaging plane of the zoom optical system on the optical axis, and ATg2 is the distance from the image side of the third lens to the object side of the fourth lens on the optical axis , ATg3 is the sum of the air intervals on the optical axis between adjacent lenses in the third lens group.
5. The zoom optical system according to claim 1, wherein the following conditional formula is satisfied:

   1≤(R7+R8)/R14≤4;

   Wherein, R7 is the radius of curvature of the object side of the fourth lens at the optical axis, R8 is the radius of curvature of the image side of the fourth lens at the optical axis, R14 is the image side of the seventh lens at the optical axis The radius of curvature at the axis.
6. The zoom optical system according to claim 1, wherein the following conditional formula is satisfied:

   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.
7. The zoom optical system according to claim 1, wherein when the zoom optical system is at the telephoto end, the image side of the fourth lens is an aperture stop of the zoom optical system, and when the zoom When the optical system is at the short focal end, the object side of the fifth lens is the aperture stop of the zoom optical system, and the zoom optical system satisfies the following conditional formula:

   1.01≤SD9/SD8≤1.5;

   Wherein, SD9 is half of the maximum effective aperture of the object side of the fifth lens, and SD8 is half of the maximum effective aperture of the image side of the fourth lens.
8. The zoom optical system according to any one of claims 1-7, further comprising a reflective element, the reflective element is disposed on the object side of the first lens, and the reflective element is used to change the direction of the optical path .
9. The zoom optical system according to claim 8, wherein the reflection element can change the direction of the light path by 90°.
10. The zoom optical system according to claim 9, wherein the reflecting element is a right angle prism.
11. The zoom optical system according to any one of claims 1-7, wherein when the optical system zooms from a short focal end to a long focal end, the first lens group and the second lens group As the distance therebetween increases, the distance between the third lens group and the fourth lens group increases.
12. The zoom optical system according to claim 11, wherein the first lens group and the fourth lens group are relatively fixed, and the second lens group and the third lens group can be connected to the first lens group. The lens group and the fourth lens group move along the optical axis.
13. The zoom optical system according to claim 12, wherein the second lens group moves synchronously with the third lens group; or

    The second lens group and the third lens group are relatively movable.
14. The zoom optical system according to any one of claims 1-7, further comprising an infrared cut filter, wherein the infrared cut filter is disposed on the image side of the eighth lens.
15. The zoom optical system according to any one of claims 1 to 7, wherein the object side surface and the image side surface of each lens in the zoom optical system are aspherical surfaces.
16. The zoom optical system according to any one of claims 1-7, wherein the material of each lens in the zoom optical system is glass.
17. The zoom optical system according to any one of claims 1-7, wherein the material of each lens in the zoom optical system is plastic.
18. A zoom imaging module, comprising a photosensitive element and the zoom optical system according to any one of claims 1-17, wherein the photosensitive element is arranged on the image side of the zoom optical system.
19. The zoom optical system according to claim 18, wherein the photosensitive element is a charge coupled element or a complementary metal oxide semiconductor device.
20. An electronic device, comprising a casing and the zoom imaging module according to claim 19, wherein the zoom imaging module is arranged on the casing.

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