Optical lens, camera module and electronic equipment

Abstract

The invention provides an optical lens, a camera module and an electronic device, and relates to the technical field of optical imaging, the optical lens provided by the invention comprises a plurality of lens groups which are sequentially arranged from an object plane to an image plane, each lens group comprises a plurality of lenses, and in the focusing process of the optical lens, the lenses are arranged in the lens groups. The first lens group in the plurality of lens groups can move along the optical axis in the direction close to or away from the image plane, and the first lens group is one lens group in the plurality of lens groups close to the image plane. According to the optical lens provided by the invention, the reserved stroke space can be reduced, so that the length size of the optical lens can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of optical imaging technology, and more specifically, to an optical lens, a camera module and an electronic device. Background Art

[0002] The application of electronic devices such as smart driving equipment, monitoring equipment, and mobile phones is becoming increasingly popular, and cameras are usually required in electronic devices to realize the photo-taking function.

[0003] When the camera takes pictures, the optical lens needs to automatically focus to switch between the near view and the far view. However, in the related art, for a telephoto lens, the optical lens needs to move a large focusing stroke, which increases the length of the optical lens. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an optical lens, a camera module and an electronic device to improve the problem of increased length of the optical lens.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, an optical lens is provided, which includes a plurality of lens groups arranged in sequence from an object plane to an image plane, each lens group includes a plurality of lenses, and during focusing of the optical lens, a first lens group among the plurality of lens groups can move along an optical axis toward or away from the image plane, and the first lens group is a lens group among the plurality of lens groups close to the image plane.

[0007] The optical lens provided in the present application is divided into a plurality of lens groups, and during the focusing process of the optical lens, the first lens group among the plurality of lens groups can move along the optical axis in a direction close to or away from the image plane. The optical lens can focus by moving the first lens group during the focusing process. Compared with the overall movement of the optical lens, moving the second lens group is conducive to shortening the focusing stroke. Moreover, the first lens group is a lens group close to the image plane among the plurality of lens groups, and the first lens group can utilize at least part of the reserved distance between the optical lens and the image plane when moving. In this way, the optical lens provided in the present application can reduce the reserved travel space, thereby facilitating the reduction of the length dimension of the optical lens and the camera module using the optical lens.

[0008] In some embodiments, during the focusing process of the optical lens switching from a distant view to a near view, the first lens group can move along the optical axis in a direction away from the image plane.

[0009] In this way, the first lens group can move along the optical axis in a direction away from the image plane, so that the optical lens can focus when switching from a distant view to a near view.

[0010] In some embodiments, during the focusing process of the optical lens switching from a near view to a far view, the first lens group can move along the optical axis in a direction close to the image plane.

[0011] In this way, the first lens group can move along the optical axis in a direction close to the image plane, so that the optical lens can focus when switching from a near view to a far view.

[0012] In some embodiments, the second lens group of the plurality of lens groups has positive optical power, the second lens group includes at least one lens with positive optical power, and the first lens group has negative optical power, the first lens group includes at least one lens with negative optical power.

[0013] In this way, the optical lens provided in the present application can have lenses with positive optical power and lenses with negative optical power, which is helpful in solving the problem of aberration.

[0014] In some embodiments, the optical lens includes six lenses, the first lens group includes a plurality of lenses among the six lenses, and the second lens group among the plurality of lens groups includes the remaining lenses among the six lenses.

[0015] In this way, the optical lens provided by the present application can include only two lens groups, a first lens group and a second lens group, so that the optical lens can only move the first lens group when focusing. Moreover, compared with three lens groups, the optical lens provided by the present application can also reduce the number of groupings, which is conducive to reducing the control logic. Only the entire optical lens and the first lens group need to be controlled, which is conducive to reducing the design / manufacturing cost.

[0016] In some embodiments, the first lens group includes a first lens, a second lens, and a third lens arranged in sequence along the optical axis, and the first lens is closer to the image plane than the third lens; the second lens group in the multiple lens groups includes a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the optical axis, and the fourth lens is closer to the image plane than the sixth lens.

[0017] In some embodiments, each of the first lens, the second lens, and the third lens has negative optical power.

[0018] In some embodiments, the fourth lens and the sixth lens have positive optical power, and the fifth lens has negative optical power.

[0019] In this way, the optical lens provided by the present application can have good optical properties.

[0020] In some embodiments, each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspherical lens, and the sixth lens is a spherical lens.

[0021] In some embodiments, the first lens, the second lens, and the third lens are relatively fixed, and the fourth lens, the fifth lens, and the sixth lens are relatively fixed.

[0022] In this way, the optical lens provided in the present application can make the first lens, the second lens and the third lens move or be fixed at the same time, and can make the fourth lens, the fifth lens and the sixth lens be fixed at the same time, which can avoid the separate control of each lens, is conducive to reducing the control logic, and thus is conducive to reducing the design / manufacturing cost.

[0023] In some embodiments, the refractive index of the second lens is greater than the refractive index of the first lens and the refractive index of the third lens.

[0024] In this way, the large refractive index of the second lens is conducive to improving the distortion of the optical lens and improving the imaging quality of the optical lens. In addition, the small refractive index of the first lens and the third lens are conducive to smooth incident light to the third lens and smooth exit of light from the first lens, which is conducive to improving the imaging quality of the optical lens.

[0025] In some embodiments, the refractive index of the first lens is equal to the refractive index of the third lens.

[0026] In this way, light can be smoothly incident on the first lens group through the third lens, and can be smoothly emitted through the first lens, which is beneficial to improving the imaging quality of the optical lens.

[0027] In some embodiments, the Abbe number of the first lens is greater than the Abbe number of at least one of the second lens and the third lens.

[0028] In this way, a large Abbe number of the first lens is beneficial to improving the dispersion of the optical lens and improving the imaging quality of the optical lens.

[0029] In some embodiments, the refractive index of the fifth lens is greater than the refractive index of the fourth lens and the refractive index of the sixth lens.

[0030] In this way, the high refractive index of the fifth lens is conducive to improving the distortion of the optical lens and improving the imaging quality of the optical lens. In addition, the low refractive index of the fourth lens and the sixth lens are conducive to smooth incident light to the sixth lens and smooth exit of light from the fourth lens, which is conducive to improving the imaging quality of the optical lens.

[0031] In some embodiments, the refractive index of the fourth lens is equal to the refractive index of the third lens.

[0032] In this way, the light can be smoothly emitted from the second lens group through the fourth lens, and smoothly incident on the first lens group through the third lens, which is beneficial to improving the imaging quality of the optical lens.

[0033] In some embodiments, the Abbe number of the fourth lens is greater than the Abbe number of at least one of the fifth lens and the sixth lens.

[0034] In this way, a large Abbe number of the fourth lens element is beneficial to improving the dispersion of the optical lens and improving the imaging quality of the optical lens.

[0035] In some embodiments, the refractive index of the sixth lens is less than the refractive index of any one of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens.

[0036] In this way, the refractive index of the sixth lens is the smallest, which is beneficial for light to pass through the sixth lens and enter the optical lens smoothly, thereby improving the imaging quality of the optical lens.

[0037] In the second aspect, the present application provides a camera module, comprising: an optical lens, a filter and a photosensitive chip. The optical lens can be an optical lens of any of the above-mentioned embodiments. The filter is located on the side of the optical lens close to the image plane along the optical axis; the photosensitive chip is located on the side of the filter away from the optical lens along the optical axis, and the image plane is located on the photosensitive chip.

[0038] The camera module provided in this application has similar or identical technical effects to the optical lens of any of the above-mentioned embodiments, which will not be described in detail here.

[0039] In some embodiments, the distance between the filter and the side of the first lens group close to the image plane is greater than the maximum travel of the first lens group during the focusing process of the optical lens. In this way, the first lens group can move in the space between the filter and the first lens group without interfering with the filter. In addition, the first lens group can use the reserved space between the filter and the first lens group, which is conducive to reducing the length of the camera module.

[0040] In a third aspect, the present application provides an electronic device, including the camera module of the above embodiment. The electronic device provided by the present application has similar or identical technical effects as the camera module of any of the above embodiments, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0042] Figure 1 One of the structural schematic diagrams of the electronic device provided in the embodiment of the present application;

[0043] Figure 2 A second structural diagram of an electronic device provided in an embodiment of the present application;

[0044] Figure 3 A schematic diagram of the structure of a camera module provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of the field curvature performance of the optical lens provided in an embodiment of the present application;

[0046] Figure 5 One of the schematic diagrams of the distortion performance of the optical lens provided in the embodiment of the present application;

[0047] Figure 6 A second schematic diagram of the distortion performance of the optical lens provided in an embodiment of the present application;

[0048] Figure 7 A third schematic diagram of the distortion performance of the optical lens provided in an embodiment of the present application;

[0049] Figure 8 A fourth schematic diagram of the distortion performance of the optical lens provided in an embodiment of the present application;

[0050] Fig. 9 A fifth schematic diagram of the distortion performance of the optical lens provided in an embodiment of the present application;

[0051] Fig.10 Schematic diagram six of the distortion performance of the optical lens provided in an embodiment of the present application.

[0052] Among them, the reference numerals in the figure are:

[0053] 100-electronic device; 101-display screen; 102-back shell; 103-camera module; 10-optical lens; 11-first lens group; 111-first lens; 112-second lens; 113-third lens; 12-second lens 112 group; 121-fourth lens; 122-fifth lens; 123-sixth lens; 20-filter; 30-photosensitive chip. DETAILED DESCRIPTION

[0054] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0056] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] As the application of electronic devices becomes more and more popular, the performance of electronic devices is gradually improved, and cameras are usually required to be provided in electronic devices to realize the photo taking function.

[0059] When taking pictures with a camera, it is usually necessary to switch between close-up and long-range shots, and the object distance will change, so the optical lens needs to focus to make the image clear. Optionally, in the related art, the camera of the electronic device usually has an autofocus function. However, for a telephoto lens, the optical lens needs to move a large focusing stroke, which increases the length of the optical lens.

[0060] In order to solve the above technical problems, an embodiment of the present application provides an electronic device, and the electronic device 100 can be an intelligent driving device (such as an intelligent driving car), a monitoring device, a mobile phone, a wearable device (such as a smart watch), a tablet, etc. The electronic device is described below using a mobile phone as an example.

[0061] The scheme of the embodiment of the present application is clearly and completely described below in conjunction with the accompanying drawings.

[0062] Please also read Figure 1 and Figure 2The electronic device 100 provided in the embodiment of the present application includes a housing, a display panel 101 (DP) and a camera module 103 (CCM), wherein the display panel 101 is installed in the housing, and the housing includes a back shell 102. The display panel 101 can be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) display panel 101, etc., wherein the OLED display panel 101 can be a flexible display panel 101 or a hard display panel 101.

[0063] The electronic device 100 may include a front camera and a rear camera. The camera module 103 may be installed on the side where the display screen 101 is located to form a front camera, and the camera module 103 may be installed on the side where the back shell 102 is located to form a rear camera. The number of the front camera and the rear camera may be one or more. It is understood that the installation position of the camera module 103 is only for illustration, and the camera module 103 may also be installed in other positions as long as the camera function can be satisfied.

[0064] See also Figure 3 The camera module 103 provided in the embodiment of the present application includes an optical lens 10, and the optical lens 10 includes a plurality of lens groups arranged in sequence from the object plane to the image plane, and each lens group includes a plurality of lenses.

[0065] Please continue reading Figure 3 In some embodiments, the camera module 103 provided in the embodiment of the present application also includes a filter 20, and the filter 20 is located on the side of the optical lens 10 close to the image plane along the optical axis direction. Among them, the optical axis is the direction in which the optical system transmits light, with reference to the main light of the central field of view. For symmetrical transmission systems, it generally coincides with the center line of rotation of the optical system. For off-axis and reflection systems, the optical axis will also appear as a broken line. The object plane refers to the surface formed before the light from the object enters the lens or reflector. It refers to the plane where the object is located or the surface of the object itself. The image plane is the surface where the image of the object is located, that is, the surface where the object can be clearly imaged through the lens. The filter 20 filters stray light and interference in the light beam to improve the resolution of the image. Among them, the filter 20 can be an infrared filter 20 (Infrared filter, AR film).

[0066] Optionally, the distance between the filter 20 and the side of the first lens group 11 close to the image plane is greater than the maximum travel of the first lens group 11 during the focusing process of the optical lens 10. In this way, the first lens group 11 can move in the space between the filter 20 and the first lens group 11 without interfering with the filter 20. In addition, the first lens group 11 can use the reserved space between the filter 20 and the first lens group 11, which is conducive to reducing the length of the camera module 103.

[0067] Please continue reading Figure 3 In some embodiments, the camera module 103 provided in the embodiment of the present application further includes a photosensitive chip 30, which is located on the side of the filter 20 away from the optical lens 10 along the optical axis direction, and the image plane is located on the photosensitive chip 30. Among them, the photosensitive chip 30 can also be called an image sensor, a photosensitive element, etc. The function of the photosensitive chip 30 is to optimize the digital image signal through a series of complex mathematical algorithm operations, and finally transmit the processed signal to the display. The photosensitive chip 30 can be an image processing chip or a digital signal processing chip (DSP), and its function is to transmit the data obtained by the photosensitive chip 30 to the central processing unit in a timely and fast manner and refresh the photosensitive chip 30. Therefore, the quality of the DSP chip directly affects the picture quality (such as color saturation, clarity, etc.).

[0068] It is understandable that during the focusing process of the optical lens 10, the first lens group 11 of the multiple lens groups can move along the optical axis in a direction close to or away from the image plane. In this way, the optical lens 10 can achieve focusing by moving the first lens group 11 during the focusing process. Compared with the overall movement of the optical lens 10, moving the second lens group 12 is conducive to shortening the focusing stroke.

[0069] In addition, the first lens group 11 is a lens group close to the image plane among the multiple lens groups, and the first lens group 11 can use at least part of the reserved distance between the optical lens 10 and the image plane when moving. In this way, the optical lens 10 provided by the present application can reduce the reserved travel space, thereby facilitating the reduction of the length of the optical lens 10.

[0070] Therefore, the optical lens 10 provided in the embodiment of the present application is conducive to reducing the length of the optical lens 10 and the camera module 103 using the optical lens 10.

[0071] In summary, the camera module 103 provided in the embodiment of the present application can be advantageously reduced in length by using the above optical lens 10. It is understandable that the optical lens 10 described in the embodiment of the present application should be understood as an integral lens, and the optical lens 10 may include multiple lenses.

[0072] Exemplarily, during the focusing process of the optical lens 10 switching from a distant view to a near view, the first lens group 11 can move along the optical axis in a direction away from the image plane. Therefore, the first lens group 11 can move along the optical axis in a direction away from the image plane to enable the optical lens 10 to focus when switching from a distant view to a near view.

[0073] Exemplarily, during the focusing process of the optical lens 10 switching from a near view to a far view, the first lens group 11 can move along the optical axis in a direction close to the image plane. Therefore, the first lens group 11 can move along the optical axis in a direction close to the image plane to enable the optical lens 10 to focus when switching from a near view to a far view.

[0074] It can be understood that the camera module 103 provided in the embodiment of the present application can utilize the optical lens 10 to focus when switching between the distant view and the near view, and can reduce the length size.

[0075] Optionally, the camera module 103 provided in the embodiment of the present application further includes a motor (not shown in the figure), and the motor is used to drive the first lens group 11 to move according to the control signal. Exemplarily, the motor can be a voice coil motor.

[0076] The camera module 103 provided in the embodiment of the present application further includes a guide rail (not shown in the figure), the first lens group 11 can be mounted on the guide rail, and the motor can drive the first lens group 11 to move along the guide rail. Exemplarily, the guide rail can extend in a straight line direction, and the motor can drive the first lens group 11 to move in a straight line direction. Exemplarily, the motor and the guide rail can be connected to the peripheral side of the first lens group 11 to avoid affecting the light passing through the first lens group 11. That is, the motor and the guide rail can be arranged around the first lens group 11.

[0077] Of course, the camera module 103 provided in the embodiment of the present application can also drive the first lens group 11 to move through other driving devices.

[0078] In some embodiments, the second lens group 12 in the plurality of lens groups has positive power, and the second lens group 12 includes at least one lens with positive power, and the first lens group 11 has negative power, and the first lens group 11 includes at least one lens with negative power. It is understandable that the plurality of lens groups of the optical lens 10 provided in the embodiment of the present application may include the first lens group 11 and the second lens group 12, and the second lens group 12 is located on the side of the first lens group 11 away from the image plane. Among them, the optical lens 10 provided in the present application may have lenses with positive power and lenses with negative power, which is conducive to solving the problem of aberration.

[0079] Exemplarily, the optical lens 10 includes six lenses, the first lens group 11 includes a plurality of lenses among the six lenses, and the second lens group 12 among the plurality of lens groups includes the remaining lenses among the six lenses.

[0080] In this way, the optical lens 10 provided in the embodiment of the present application can include only two lens groups, the first lens group 11 and the second lens group 12, so that the optical lens 10 can only move the first lens group 11 when focusing. Moreover, compared with three lens groups, the optical lens 10 provided in the present application can also reduce the number of groups, which is beneficial to reducing the control logic. Only the entire optical lens 10 and the first lens group 11 need to be controlled, which is beneficial to reducing the design / manufacturing cost.

[0081] Optionally, the optical lens 10 provided in the embodiment of the present application may further include a third lens group, and the third lens group is located on a side of the second lens group 12 away from the first lens group 11.

[0082] Please continue reading Figure 3 In some examples, the optical lens 10 provided in the embodiment of the present application includes two lens groups. Each lens group may include multiple lenses. For example, each lens group includes three lenses. The first lens group 11 may include a first lens 111, a second lens 112, and a third lens 113 arranged in sequence along the optical axis, and the first lens 111 is closer to the image plane than the third lens 113. The second lens group 12 may include a fourth lens 121, a fifth lens 122, and a sixth lens 123 arranged in sequence along the optical axis, and the fourth lens 121 is closer to the image plane than the sixth lens 123. Of course, the number of each lens group may be inconsistent. For example, one of the first lens group 11 and the second lens group 12 includes one lens, and the other includes five lenses. For example, one of the first lens group 11 and the second lens group 12 includes two lenses, and the other includes four lenses.

[0083] Optionally, in some embodiments, any two of the first lens 111 , the second lens 112 and the third lens 113 are relatively fixed, and any two of the fourth lens 121 , the fifth lens 122 and the sixth lens 123 are relatively fixed.

[0084] In this way, the optical lens 10 provided in the present application can make the first lens 111, the second lens 112 and the third lens 113 move or fix at the same time, and can make the fourth lens 121, the fifth lens 122 and the sixth lens 123 fixed at the same time, which can avoid controlling each lens separately, is conducive to reducing control logic, and thus is conducive to reducing design / manufacturing costs.

[0085] In some embodiments, each of the first lens 111, the second lens 112, and the third lens 113 has negative power. In some embodiments, the fourth lens 121 and the sixth lens 123 have positive power, and the fifth lens 122 has negative power. In some embodiments, each of the first lens 111, the second lens 112, and the third lens 113 has negative power, and the fourth lens 121 and the sixth lens 123 have positive power, and the fifth lens 122 has negative power.

[0086] It can be understood that, in the optical lens 10 provided in the present application, multiple optical lenses are combined together, and different optical lenses can have different light parameters, so that the optical lens 10 can have good optical properties.

[0087] In some embodiments, the refractive index of the second lens 112 is greater than the refractive index of the first lens 111 and the refractive index of the third lens 113 .

[0088] It is understandable that the inventors have found that as the refractive index of the optical lens increases, the optical lens can select a lens with a smaller thickness to achieve optical characteristics, especially the thickness of the edge of the optical lens can be reduced. In this embodiment, the large refractive index of the second lens 112 is beneficial to improving the distortion of the optical lens 10 and improving the imaging quality of the optical lens 10.

[0089] In addition, the refractive index of the first lens 111 and the refractive index of the third lens 113 are small, which is conducive to the smooth incidence of light to the third lens 113 and the smooth emission of light from the first lens 111, which is conducive to improving the imaging quality of the optical lens 10.

[0090] Similarly, in some embodiments, the refractive index of the fifth lens 122 is greater than the refractive index of the fourth lens 121 and the refractive index of the sixth lens 123 .

[0091] Therefore, a large refractive index of the fifth lens element 122 is beneficial to improving the distortion of the optical lens 10 and improving the imaging quality of the optical lens 10 .

[0092] In addition, the refractive index of the fourth lens 121 and the refractive index of the sixth lens 123 are small, which is conducive to the smooth incidence of light into the sixth lens 123 and the smooth emission of light from the fourth lens 121, thereby improving the imaging quality of the optical lens 10.

[0093] In some embodiments, the Abbe number of the first lens 111 is greater than the Abbe number of at least one of the second lens 112 and the third lens 113 .

[0094] It should be noted that the inventors have found that the Abbe number of an optical lens is positively correlated with the degree of dispersion of light passing through the optical lens. Therefore, a large Abbe number of the first lens 111 is beneficial to improving the dispersion of the optical lens 10, thereby improving the imaging quality of the optical lens 10. Moreover, the first lens 111 is closer to the image plane than other lenses of the optical lens 10, and the first lens 111 plays a more important role in improving the dispersion of the optical lens 10. Therefore, a large Abbe number of the first lens 111 is more beneficial to improving the dispersion of the optical lens 10.

[0095] It is understandable that, for some optical lenses, the Abbe number of the optical lens is negatively correlated with the refractive index of the optical lens. However, for some special optical lenses, the Abbe number of the optical lens has no specific relationship or positive correlation with the refractive index of the optical lens.

[0096] Similarly, in some embodiments, the Abbe number of the fourth lens 121 is greater than the Abbe number of at least one of the fifth lens 122 and the sixth lens 123, which is beneficial to improving the dispersion of the optical lens 10, thereby improving the imaging quality of the optical lens 10. Moreover, the fourth lens 121 is closer to the image plane than other lenses of the second lens group 12, and the fourth lens 121 plays a more important role in improving the dispersion of the optical lens 10. Therefore, a larger Abbe number of the fourth lens 121 is more beneficial to improving the dispersion of the optical lens 10.

[0097] In some embodiments, the refractive index of the sixth lens 123 is less than the refractive index of any one of the first lens 111, the second lens 112, the third lens 113, the fourth lens 121, and the fifth lens 122. That is, among all the lenses of the optical lens 10, the refractive index of the sixth lens 123 is the smallest. In this way, the light can be smoothly emitted from the second lens group 12 through the fourth lens 121, and smoothly incident on the first lens group 11 through the third lens 113, which is conducive to improving the imaging quality of the optical lens 10. In some embodiments, the refractive index of the fourth lens 121 is equal to the refractive index of the third lens 113. In this way, the light can be smoothly emitted from the second lens group 12 through the fourth lens 121, and smoothly incident on the first lens group 11 through the third lens 113, which is conducive to improving the imaging quality of the optical lens 10.

[0098] Optionally, the refractive index of the first lens 111 is equal to the refractive index of the third lens 113 , and the light can be smoothly incident on the first lens group 11 through the third lens 113 , and smoothly emitted through the first lens 111 , which is beneficial to improving the imaging quality of the optical lens 10 .

[0099] Optionally, each of the first lens 111, the second lens 112, the third lens 113, the fourth lens 121 and the fifth lens 122 is an aspherical lens, and the sixth lens 123 is a spherical lens. It is understandable that spherical and aspherical surfaces are mainly used for the geometric shapes of lenses (various cameras, microscopes, etc.) and glasses (including contact lenses), that is, spherical lenses and aspherical lenses. The difference in geometry between the two determines the difference in the refraction direction of parallel incident light, thereby affecting the quality of the imaging effect. It is understandable that the aspherical lens can improve the field curvature of the optical lens, so that the optical lens 10 has good field curvature performance.

[0100] The aspheric surfaces of the first lens 111, the second lens 112, the third lens 113, the fourth lens 121 and the fifth lens 122 satisfy the Zernike polynomials. The Zernike polynomials are:

[0101]

[0102] Where Z is the sag of the surface parallel to the Z axis, the Z axis coincides with the optical axis, c is the reciprocal of the radius of curvature of the aspheric surface, r is the radius of the lens, K is the cone coefficient, and A, B, C, D, E, F, G, and H are the aspheric coefficients.

[0103] Exemplarily, the data related to each parameter of each lens is shown in the following table:

[0104]

[0105] Among them, E1 is the image side surface of the filter, E2 is the object side surface of the filter, E3 is the image side surface of the first lens 111, E4 is the object side surface of the first lens 111, E5 is the image side surface of the second lens 112, E6 is the object side surface of the second lens 112, E7 is the image side surface of the third lens 113, E8 is the object side surface of the third lens 113, E9 is the image side surface of the fourth lens 121, E10 is the object side surface of the fourth lens 121, E11 is the image side surface of the fifth lens 122, E12 is the object side surface of the fifth lens 122, E13 is the image side surface of the sixth lens 123, and E14 is the object side surface of the sixth lens 123. It can be understood that, with the lens as the boundary, the side where the object is located is the object side, and the surface of the lens close to the object side can be called the object side; with the lens as the boundary, the side where the image of the object is located is the image side, and the surface of the lens close to the image side can be called the image side.

[0106] The aspheric coefficients of each aspheric surface are listed in the following table. It can be understood that the aspheric coefficients in the Zernike polynomials are usually listed as 8 items.

[0107] Surface marking A B C D E12 -8.68E-01 -1.18E-02 -4.98E-05 -5.97E-06 E11 -2.57E-02 -3.93E-03 2.45E-04 -1.13E-05 E10 -5.90E-01 2.58E-04 9.18E-05 -9.29E-06 E9 2.84E-01 2.93E-03 7.18E-05 -7.41E-07 E8 -1.55E+00 -1.38E-02 -2.80E-04 3.20E-07 E7 -2.52E-01 -3.19E-03 -1.76E-04 2.27E-05 E6 -2.03E+00 3.70E-02 -1.61E-03 1.09E-04 E5 -4.20E-01 1.60E-03 1.64E-05 -3.40E-05 E4 -1.19E+00 3.12E-02 -1.49E-03 3.55E-05 E3 -6.74E-01 1.95E-02 -8.99E-04 1.53E-05

[0108] Surface marking E F G H E12 -7.52E-07 6.57E-08 -2.32E-09 3.03E-12 E11 -4.06E-07 5.33E-08 8.72E-10 -8.47E-11 E10 6.44E-07 -1.01E-07 8.54E-09 -2.23E-10 E9 3.27E-07 -5.06E-08 3.35E-09 -7.38E-11 E8 -1.94E-06 1.37E-07 -4.45E-09 3.48E-12 E7 -6.49E-06 5.66E-07 -2.51E-08 2.81E-10 E6 -1.24E-05 1.10E-06 -6.10E-08 1.34E-09 E5 1.65E-06 1.70E-07 -2.46E-08 8.21E-10 E4 -7.40E-07 3.18E-07 -3.34E-08 9.96E-10 E3 2.35E-06 -2.26E-07 8.21E-09 -1.12E-10

[0109] See also Figure 4 , Figure 4 A schematic diagram of the field curvature performance of the optical lens 10 provided in an embodiment of the present application, from Figure 4 It can be seen that as the field angle increases, the field curvature varies between -0.04 mm and 0.06 mm, and the field curvature performance is good. Therefore, the optical lens 10 provided in the embodiment of the present application has good field curvature performance.

[0110] Among them, the horizontal axis is the field curvature (in mm), the vertical axis is the field angle (in degrees), a1 represents the meridian light with a wavelength of 0.435 mm, b1 represents the sagittal light with a wavelength of 0.435 mm, b1 represents the sagittal light with a wavelength of 0.47 mm, b2 represents the sagittal light with a wavelength of 0.47 mm, c1 represents the meridian light with a wavelength of 0.51 mm, c2 represents the sagittal light with a wavelength of 0.51 mm, d1 represents the meridian light with a wavelength of 0.588 mm, d2 represents the sagittal light with a wavelength of 0.588 mm, e1 represents the meridian light with a wavelength of 0.61 mm, e2 represents the sagittal light with a wavelength of 0.61 mm, f1 represents the meridian light with a wavelength of 0.65 mm, and f2 represents the sagittal light with a wavelength of 0.65 mm.

[0111] Please also read Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 as well as Fig.10 ,in, Figures 5 to 10 The horizontal axis is the percentage of distortion (representing the size of distortion), and the vertical axis is the field of view angle. Figure 5 It shows the distortion of light with a wavelength of 0.435 mm. Figure 6 It shows the distortion of light with a wavelength of 0.47 mm. Figure 7 It shows the distortion of light with a wavelength of 0.51 mm. Figure 8 It shows the distortion of light with a wavelength of 0.588 mm. Fig. 9 It shows the distortion of light with a wavelength of 0.61 mm. Fig.10 It shows the distortion of light with a wavelength of 0.65 mm.

[0112] As can be seen from the figure, Figure 5 In the image, the distortion of light with a wavelength of 0.435mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. As the field of view angle increases, the growth rate of distortion slows down and the distortion remains at 1.5%. Figure 6In the image, the distortion of light with a wavelength of 0.47 mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. As the field of view angle increases, the growth rate of distortion slows down and the distortion remains at 1.5%. Figure 7 In the , the distortion of the light with a wavelength of 0.51mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. As the field of view angle increases, the growth rate of distortion slows down and the distortion remains at 1.5%. Figure 8 In the image, the distortion of light with a wavelength of 0.588mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. As the field of view angle increases, the growth rate of distortion slows down and the distortion remains at 1.5%. Fig. 9 In the image, the distortion of light with a wavelength of 0.61 mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. As the field of view angle increases, the growth rate of distortion slows down and the distortion remains at 1.5%. Fig.10 In the embodiment of the present invention, the distortion of the light with a wavelength of 0.65 mm does not exceed 1.5% as the field of view angle increases, and the distortion is small. Moreover, as the field of view angle increases, the growth rate of the distortion slows down, and the distortion is maintained at 1.5%. Therefore, the optical lens 10 provided in the embodiment of the present application has good distortion performance. The above description is only a specific embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical lens, characterized in that: It comprises a plurality of lens groups arranged in sequence from the object plane to the image plane, each of the lens groups comprises a plurality of lenses, During the focusing process of the optical lens, a first lens group among the multiple lens groups can move along the optical axis in a direction close to or away from the image plane, and the first lens group is a lens group among the multiple lens groups close to the image plane.

2. The optical lens according to claim 1, wherein: The second lens group among the plurality of lens groups has positive optical power, and the second lens group includes at least one lens with positive optical power. The first lens group has negative optical power, and the first lens group includes at least one lens with negative optical power.

3. The optical lens according to claim 1 or 2, characterized in that: The optical lens includes six lenses, the first lens group includes a plurality of lenses among the six lenses, and the second lens group among the plurality of lens groups includes the remaining lenses among the six lenses.

4. The optical lens according to claim 1, wherein: The first lens group includes a first lens, a second lens and a third lens sequentially arranged along the optical axis, and the first lens is closer to the image plane than the third lens; The second lens group of the multiple lens groups includes a fourth lens, a fifth lens and a sixth lens arranged in sequence along the optical axis, and the fourth lens is closer to the image plane than the sixth lens.

5. The optical lens according to claim 4, characterized in that: Each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspherical lens, and the sixth lens is a spherical lens.

6. The optical lens according to claim 4, characterized in that: The refractive index of the second lens is greater than the refractive index of the first lens and the refractive index of the third lens.

7. The optical lens according to claim 4 or 6, characterized in that: The refractive index of the first lens is equal to the refractive index of the third lens.

8. The optical lens according to claim 4, wherein: The refractive index of the sixth lens is smaller than the refractive index of any one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens.

9. A camera module, characterized in that: include: The optical lens according to any one of claims 1 to 8; A filter, located on a side of the optical lens close to the image plane along the optical axis; A photosensitive chip is located on a side of the filter away from the optical lens along the optical axis, and the image plane is located on the photosensitive chip.

10. An electronic device, characterized in that: Comprising the camera module as claimed in claim 9.

Images