Optical lenses, camera modules and electronic devices

Abstract

The present application provides an optical lens, a camera module and an electronic device, which relate to the field of photography and video technology, and are used to solve the problem that the existing camera module is large in size and has a slow focusing speed. The optical lens provided by the present application includes a focusing lens group and a first optical element. Among them, the focusing lens group includes at least one lens with optical focal length, and the focusing lens group can move along the optical axis of the optical lens. The first optical element is fixed to the object side of the focusing lens group, and the radius of curvature of at least one of the object side surface and the image side surface of the first optical element is variable. The change in the radius of curvature of the object side surface and / or the image side surface of the first optical element causes the optical focal length of the first optical element to change accordingly, thereby greatly shortening the stroke of the focusing lens group. Under the premise that the driving speed of the focusing motor remains unchanged, the focusing speed of the focusing lens group is significantly improved. And because the stroke of the focusing lens group is shortened, the size of the entire optical lens is also reduced accordingly.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photography and video technology, and in particular to an optical lens, a camera module and an electronic device. Background Art

[0002] As people's demand for electronic devices (such as mobile phones, tablet computers, smart watches, etc.) grows year by year, electronic devices have more functions. For example, electronic devices generally have the function of taking photos and videos, and the realization of this function is based on the camera module.

[0003] With the development of photography and video technology, camera modules generally begin to have the function of adjusting focal length to be applicable to a variety of shooting scenes. However, existing camera modules are large in size and slow in focusing speed, which hinders user experience. Summary of the invention

[0004] The embodiments of the present application provide an optical lens, a camera module and an electronic device for solving the problems of large size and slow focusing speed of existing camera modules.

[0005] In order to achieve the above purpose, the embodiment of the present application adopts the following technical solution:

[0006] In a first aspect, an embodiment of the present application provides an optical lens, comprising a focusing lens group and a first optical element.

[0007] The focusing lens group includes at least one lens with optical power, and the focusing lens group can move along the optical axis of the optical lens. The first optical element is fixed to the object side of the focusing lens group, and the curvature radius of at least one of the object side surface and the image side surface of the first optical element is variable.

[0008] The optical lens provided in the first aspect of the present application is provided with a first optical element having a variable curvature radius of the object side or image side on the object side of the focusing lens group. Exemplarily, the first optical element may be a liquid lens, and the change of the curvature radius of the object side or image side also means that the optical power of the liquid lens also changes accordingly.

[0009] In this way, compared with the traditional lens that focuses only by moving the focus lens group, the optical lens provided by the present application changes the focal length of the first optical element by adjusting the radius of curvature of the object side and / or image side of the first optical element when focusing, and at the same time, the focus motor synchronously drives the focus lens group to move. The change in the focal length of the first optical element greatly shortens the distance that the focus lens group needs to move (i.e., the stroke of the focus lens group), and the focusing speed of the optical lens is significantly improved under the premise that the driving speed of the focus motor remains unchanged. And because the stroke of the focus lens group is shortened, the size of the entire optical lens is also reduced, which is conducive to the thinness of electronic equipment.

[0010] In combination with the first aspect, in a possible implementation, the optical lens further includes a light deflection component, the focusing lens group, the first optical element and the light deflection component are arranged along the extension direction of the optical axis, and the light deflection component is located on the object side of the focusing lens group. The light deflection component may be a reflector, a reflecting prism, etc. In this way, the optical axis of the optical lens can be deflected and folded by using the light deflection component, that is, the light deflection component can convert the thickness of the optical lens into the length, so that the optical lens can achieve a telephoto effect while maintaining a small thickness, which is conducive to the thinness of electronic devices.

[0011] In combination with the first aspect, in another possible implementation, the optical lens further includes a second optical element, and at least one of the object side surface and the image side surface of the second optical element has a variable radius of curvature. The focusing lens group, the first optical element, the light deflection component, and the second optical element are arranged along the extension direction of the optical axis, and the second optical element is located on the object side of the focusing lens group, and the first optical element and the second optical element are respectively arranged on both sides of the light deflection component. When focusing, the travel of the focusing lens group can be further shortened by cooperating with the first optical element and the second optical element, so that the focusing speed of the optical lens is significantly improved. And the size of the entire optical lens can also be further reduced, which is conducive to the thinness of electronic devices.

[0012] In combination with the first aspect, in another possible implementation, the light deflection component is a reflective prism. The direction of the light can be changed by the reflective prism, for example, the optical lens can be applied to a periscope camera module.

[0013] In combination with the first aspect, in another possible implementation, the first optical element is located on the object side of the light deflection component and is spaced apart from the light deflection component. In this way, the position of the first optical element can be appropriately adjusted according to the spatial layout inside the electronic device so that it is spaced apart from the light deflection component. For example, the first optical element can be disposed on the portion of the camera decorative cover of the electronic device that protrudes from the back cover, which is equivalent to the first optical element being located outside the back cover, thereby further reducing the thickness of the electronic device.

[0014] In combination with the first aspect, in another possible implementation, the optical lens further includes an infrared filter, and along the extension direction of the optical axis of the optical lens, the infrared filter is located on the image side of the last lens in the optical lens. The use of an infrared filter can effectively filter out infrared light and only allow visible light to enter, thereby improving image quality and clarity. In addition, it can also prevent infrared light from generating heat on the surface of the optical device, thereby preventing infrared light from affecting image quality and clarity.

[0015] In combination with the first aspect, in another possible implementation, the optical lens further includes an aperture, which is disposed on the focusing lens group. With this arrangement, the aperture can improve the clarity of the image, control the range of the image object space, and control the brightness of the image plane. Moreover, by adjusting the size of the aperture, a larger entrance pupil diameter can be obtained, so that a larger aperture and diffraction limit value can be obtained when the focal length of the optical lens remains unchanged, which is conducive to improving the imaging quality of the optical lens.

[0016] In combination with the first aspect, in another possible implementation, the first optical element includes a transparent film layer, a transparent cover plate and a driving unit, the transparent film layer and the transparent cover plate are arranged at intervals, the driving unit is arranged around the transparent film layer and the transparent cover plate, the transparent film layer, the cover plate and the driving unit form a receiving cavity, and the receiving cavity is filled with a first optical fluid and a second optical fluid that are immiscible with each other. In other words, the first optical element is a liquid lens, the transparent film layer has elasticity, and the first optical fluid and the second optical fluid have fluidity, and the shapes of the first optical fluid and the second optical fluid are changed by controlling the driving unit to apply a driving voltage to the first optical fluid and the second optical fluid, so that the curvature radius of the transparent film layer can be changed within milliseconds, thereby realizing rapid adjustment of the optical focal length of the liquid lens.

[0017] In combination with the first aspect, in another possible implementation, when the first optical element is located on the object side of the light deflection component and is spaced apart from the light deflection component, the optical lens satisfies the following relationship: 0.2 mm ≤ CL ≤ 0.5 mm, where CL is the distance between the first optical element and the light deflection component along the extension direction of the optical axis.

[0018] The above relationship limits the range of values ​​of the distance between the first optical element and the light deflecting component in the optical lens. When the first optical element is arranged on the camera decorative cover, it can minimize the volume of the optical lens while avoiding interference between the light deflecting component and the back cover or the camera decorative cover.

[0019] In combination with the first aspect, in another possible implementation, the optical lens satisfies the following relationship: 0.95<EFL1 / EFL2<1.05, wherein EFL1 is the effective focal length of the optical lens when imaging at infinity; and EFL2 is the effective focal length of the optical lens when imaging at close range.

[0020] The above relationship limits the ratio range of the effective focal length of the optical lens when imaging at infinity to the effective focal length of the optical lens when imaging at close range, so that the focal length change value is small when the optical lens is focusing, and the impact on the imaging effect is relatively slight.

[0021] In combination with the first aspect, in another possible implementation, the optical lens satisfies the following relationship: EFL1 / AL>14, wherein EFL1 is the effective focal length of the optical lens when imaging at infinity; and AL is the stroke of the focusing lens group.

[0022] The above relationship limits the ratio of the effective focal length of the optical lens to the stroke of the focusing lens group when imaging at infinity to be higher than the lower limit of 14, thereby reasonably allocating the optical focal length of the first optical element and the focusing lens group, thereby reducing the stroke of the focusing lens group when moving for focusing, and at the same time reducing the tolerance sensitivity of the first optical element and the focusing lens group, which is beneficial to improving the resolution of the optical lens.

[0023] In combination with the first aspect, in another possible implementation, the optical lens satisfies the following relationship: TL≤200 mm. Wherein, TL is the object distance of the optical lens during close-range imaging. The optical lens provided in the present application can be suitable for macro photography with an object distance of less than 200 mm.

[0024] In combination with the first aspect, in another possible implementation, the optical lens satisfies the following relationship: AL≤0.7 mm. Wherein AL is the stroke of the focus lens group. Through the above structural design of the present application, the stroke of the focus lens group can be limited to within 0.7 mm, and the size of the optical lens is also greatly reduced, which is conducive to the thinness of electronic devices.

[0025] In a second aspect, the present application provides a camera module, which includes a substrate, an image sensor and the optical lens of the first aspect.

[0026] The image sensor is arranged on the substrate, the image sensor has an imaging surface, the optical lens is electrically connected to the substrate, and the image side of the optical lens faces the imaging surface of the image sensor.

[0027] It can be understood that the beneficial effects that can be achieved by the camera module described in the second aspect and any possible implementation method provided above can be referred to the beneficial effects in the first aspect and any possible implementation method thereof, and will not be repeated here.

[0028] In a third aspect, the present application provides an electronic device, which includes a housing, a mainboard, and the camera module of the second aspect, wherein the mainboard and the camera module are both arranged in the housing, and the camera module is electrically connected to the mainboard.

[0029] It can be understood that the beneficial effects that can be achieved by the electronic device described in the third aspect and any possible implementation thereof provided above can refer to the beneficial effects in the first aspect and any possible implementation thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the overall structure of an electronic device provided in an embodiment of the present application;

[0031] Figure 2 For the above Figure 1 Structural explosion diagram of electronic equipment;

[0032] Figure 3 A schematic diagram of the structure of a camera module provided in an embodiment of the present application;

[0033] Figure 4 for Figure 3 The structural explosion diagram of the camera module in the middle;

[0034] Figure 5 A schematic diagram of the relative positions of the lens module and the image sensor;

[0035] Figure 6 A schematic diagram of a planar structure of an optical lens provided in an embodiment of the present application;

[0036] Figure 7 A schematic structural diagram of a first optical element provided in an embodiment of the present application;

[0037] Figure 8 A schematic diagram of a three-dimensional structure of an optical lens provided in an embodiment of the present application;

[0038] Fig. 9 A schematic diagram of the three-dimensional structure of another optical lens provided in an embodiment of the present application;

[0039] Fig.10A schematic diagram of a planar structure of another optical lens provided in an embodiment of the present application;

[0040] Fig.11 A schematic diagram of a three-dimensional structure of another optical lens provided in an embodiment of the present application;

[0041] Fig.12 A schematic diagram of the planar structure of the optical lens provided in Example 1;

[0042] Fig.13 This is the MTF curve of the optical lens in Example 1 when imaging at infinity;

[0043] Fig.14 This is the MTF curve of the optical lens in Example 1 when imaging at close range;

[0044] Fig.15 A schematic diagram of the planar structure of the optical lens provided for Example 2;

[0045] Fig.16 A schematic diagram of the planar structure of the optical lens provided in Example 3;

[0046] Fig.17 A schematic diagram of the planar structure of the optical lens provided in Example 4;

[0047] Fig.18 This is the MTF curve of the optical lens in Example 4 when imaging at infinity;

[0048] Fig.19 This is the MTF curve of the optical lens in Example 4 when imaging at close range;

[0049] Fig. 20 A schematic diagram of the planar structure of the optical lens provided in Example 5;

[0050] Fig.21 This is the MTF curve of the optical lens in Example 5 when imaging at infinity;

[0051] Fig. 22 This is the MTF curve of the optical lens in Example 5 when imaging at close range;

[0052] Fig.23 A schematic diagram of the planar structure of the optical lens provided for Example 6;

[0053] Fig.24 This is the MTF curve of the optical lens in Example 6 when imaging at infinity;

[0054] Fig.25 This is the MTF curve of the optical lens in Example 6 when imaging at close range.

[0055] Reference numerals:

[0056] 01. electronic device; 10. display module; 11. light-transmitting panel; 12. display screen; 20. housing; 21. back cover; 22. frame; 30. camera module; 31. substrate; 32. image sensor; 32a. imaging surface; 33. flexible circuit board; 34. lens module; 35. housing; 36. optical lens; 360. optical axis; 361. first optical element; 3611. transparent film layer; 3610. transparent cover plate; 3613. driving unit; 3614. first optical fluid; 3615. second optical fluid; 362. focusing lens group; 3621. first lens; 3622. second lens; 3623. third lens; 3624. fourth lens; 3625. fifth lens; 363. light deflection component; 364. second optical element; 365. aperture; 366. infrared filter; 40. main board; 50. camera decorative cover. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the application more clear, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0058] In the description of the present application, it should be clarified that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application, and do not mean that the devices or elements referred to must have a specific direction or position, and therefore cannot be understood as limiting the present application. The "quantity" mentioned above cannot be understood as limiting the present application.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] For ease of understanding, the technical terms involved in this application are explained and described below.

[0061] The object side and the object-side surface are separated by the lens / lens group. The side where the object is located is the object side, and the surface of the lens / lens group close to the object side can be called the object-side surface.

[0062] The image side and the image side surface are separated by the lens / lens group. The side where the image of the object is located is the image side, and the surface of the lens / lens group close to the image side can be called the image side surface.

[0063] Focal length, also known as focal length, is a measure of the convergence or divergence of light in an optical system. It refers to the vertical distance from the optical center of a lens or lens group to the focal plane when an infinitely distant scene forms a clear image on the focal plane through a lens or lens group. From a practical point of view, it can be understood as the distance from the center of the lens to the film plane. For a fixed-focus lens, the position of its optical center is fixed; for a zoom lens, the change of the optical center of the lens brings about a change in the focal length of the lens.

[0064] Object distance refers to the distance from the object to the optical center of the lens.

[0065] The effective focal length for infinity imaging refers to the distance from the front edge of the depth of field to the lens when the lens is focused at infinity. This distance is called the hyperfocal distance. When the lens is focused at the hyperfocal point, everything from the hyperfocal point to half the distance of the camera to infinity is clear.

[0066] The effective focal length for close-range imaging. Within this focal length range, the lens can provide a wider viewing angle, which is suitable for shooting close-range objects.

[0067] The aperture is a device used to control the amount of light that passes through the lens and enters the imaging surface of the camera body. It is usually inside the lens. The aperture size is expressed in F / .

[0068] The aperture F value is the relative value obtained by dividing the focal length of the lens by the diameter of the lens (the inverse of the relative aperture). The smaller the aperture F value, the more light enters in the same unit time. The larger the aperture F value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a telephoto lens.

[0069] Focal power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam. It characterizes the ability of an optical system to deflect light. When the refractive index of air is approximately 1, the general focal power is expressed as the reciprocal of the image-side focal length.

[0070] The optical axis is the direction in which the optical system transmits light, referring to the principal ray of the central field of view. For symmetrical transmission systems, it generally coincides with the centerline of rotation of the optical system.

[0071] The entrance pupil diameter is the effective aperture that limits the incident light beam.

[0072] Lens bonding is a lens obtained by bonding two lenses together. The curvature radius of the bonding surfaces of the two lenses is equal, or one of the surfaces is flat. This combination lens formed by two lenses is an effective method to achieve short focal length, high magnification and good imaging quality.

[0073] Optical Transfer Function (OTF) is used to characterize the filtering transformation of the optical system to the spatial spectrum. OTF uses spatial frequency as a variable to describe the relative changes in modulation and lateral phase shift during the imaging process.

[0074] Modulation Transfer Function (MTF), generally, the contrast of the output image through the optical system is always worse than the contrast of the input image, and the change in this contrast is closely related to the spatial frequency characteristics. The ratio of the contrast of the output image to the input image is called the modulation transfer function.

[0075] Long focal length lenses are also called telephoto lenses or telephoto lenses. When photographing distant objects, long focal length lenses are needed. They can well show the details of distant scenes and photograph some difficult-to-approach subjects. However, due to the large focal length, long focal length lenses require a large axial space for the system optical path to adjust, resulting in a slow focusing speed and a large total optical length of the lens, which cannot meet the development trend of thin and light electronic devices.

[0076] Based on this, an embodiment of the present application provides an electronic device. Specifically, the electronic device may be a portable electronic device or other types of electronic devices. For example, the electronic device may be a mobile phone, a tablet personal computer, a laptop computer, a personal digital assistant (PDA), a monitor, a camera, a personal computer, a notebook computer, a wearable device, etc. For the convenience of explanation, the following examples are all taken as an example of the electronic device being a mobile phone.

[0077] See also Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure of the electronic device 01 provided in the embodiment of the present application. Figure 2 For the above Figure 1 Exploded diagram of the structure of the electronic device 01. As can be seen from the above, in this embodiment, the electronic device 01 is a mobile phone, and the electronic device 01 can be in an approximately rectangular plate-shaped structure. The electronic device 01 can include a display module 10, a housing 20, a camera module 30, a mainboard 40 and a camera decorative cover 50.

[0078] For the convenience of the following description, an XYZ coordinate system is established, and the width direction of the electronic device 01 is defined as the X-axis direction, the length direction of the electronic device 01 is defined as the Y-axis direction, and the thickness direction of the electronic device 01 is defined as the Z-axis direction. Therefore, this application does not make any special restrictions on this. It can be understood that Figure 1 and Figure 2 Only some components of the electronic device 10 are schematically shown, and the actual shapes, sizes, positions and structures of these components are not subject to the present invention. Figure 1 and Figure 2 In some other examples, the electronic device 10 may not include the camera decorative cover 50.

[0079] The above-mentioned display module 10 is used to display images, videos, etc. The display module 10 may include a translucent panel 11 and a display screen 12 (English name: panel, also called display panel), and the translucent panel 11 and the display screen 12 are stacked. The material of the translucent panel 11 includes but is not limited to glass. For example, the translucent panel 11 can adopt an ordinary translucent panel to protect the display screen to avoid damage to the display screen due to external force, and it can play a dust-proof role. Alternatively, the translucent panel 11 can also adopt a translucent panel with a touch function, so that the electronic device 01 has a touch function, which makes it more convenient for users to use. Therefore, the present application does not specifically limit the specific material of the translucent panel 11.

[0080] In addition, the display screen 12 may be a flexible display screen or a rigid display screen. For example, the display screen 12 may be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode or an active-matrix organic light-emitting diode (AMOLED) display screen, a mini light-emitting diode display screen, a micro light-emitting diode display screen, a micro organic light-emitting diode display screen, a quantum dot light-emitting diode (QLED) display screen, an optical fluid display screen (LCD), etc.

[0081] The housing 20 is used to protect the electronic components inside the electronic device 01. The housing 20 may include a back cover 21 and a frame 22. The back cover 21 is located on the side of the display screen 12 away from the light-transmitting panel 11, and is stacked with the light-transmitting panel 11 and the display screen 12. The frame 22 is located between the light-transmitting panel 11 and the back cover 21. The frame 22 is fixed to the back cover 21. The light-transmitting panel 11 is fixed to the frame 22, so that the light-transmitting panel 11, the back cover 21 and the frame 22 form a receiving cavity inside the electronic device 01, and the display screen 12, the main board 40 and the camera module 30 are all arranged in the internal receiving space.

[0082] The mainboard 40 is used to set the electronic components of the electronic device 10 and realize the electrical connection between the electronic components. For example, the electronic components can be a control chip (such as a system on chip, SOC), a graphics processing unit (GPU), a universal flash storage (UFS), an earpiece, a flash module, and the camera module 30.

[0083] The camera module 30 is used to shoot videos or pictures. The camera module 30 may include a vertical type and a periscope type. Figure 3 and Figure 4 As shown, Figure 3 A schematic structural diagram of a camera module 30 provided in an embodiment of the present application. Figure 4 for Figure 3 An exploded diagram of the structure of the camera module 30.

[0084] The camera module 30 may include a substrate 31, an image sensor 32, a lens module 34 and a housing 35. The housing 35 is fixed on the substrate 31, and the lens module 34 is located in the housing 35 and is electrically connected to the substrate 31. The image sensor 32 is arranged on the substrate 31, and the image sensor 32 has an imaging surface 32a. One end of the flexible circuit board 33 is electrically connected to the substrate 31, and the other end of the flexible circuit board 33 is used to be electrically connected to the above-mentioned main board 40. The camera module 30 can be electrically connected to the main board 40 through the flexible circuit board 33 (FPC, Flexible Printed Circuit).

[0085] For example, the camera module 30 can be a telephoto camera, that is, its lens module 34 is a telephoto lens, and the focal length of the lens is greater than the focal length of a standard lens. Therefore, the camera module 30 can shoot distant objects or scenes, making the shooting scenes of the electronic device 01 more extensive, which is conducive to improving the user experience.

[0086] The camera module 30 has an object side and an image side. The object side may be the object side of the lens module 34 inside the camera module 30, and the image side may be the image side of the lens module 34 inside the camera module 30. The object side of the lens module 34 faces the rear cover 21, and the image side of the lens module 34 faces the imaging surface 32a of the image sensor 32. The rear cover 21 is provided with a mounting notch ( Figure 2 Not shown), the camera decorative cover 50 (such as Figure 2 The camera decorative cover 50 is fixed in the installation notch, and the camera decorative cover 50 has a light-transmitting window. The object side of the lens module 34 is opposite to the light-transmitting window, so that the external light can pass through the light-transmitting window, enter the lens module 34 from the object side of the lens module 34, and then be emitted from the image side of the lens module 34 to illuminate the image sensor 32. The image sensor 32 then converts the received light signal into a digital signal, outputs it to the digital signal processor (DSP, Digital Signal Processing) for image signal enhancement and compression optimization, and finally transmits it to Figure 2 An image is displayed on the display screen 12 shown.

[0087] It should be noted that in the above-mentioned camera module 30, the optical axis of the lens module 34 ( Figure 4 The dotted line in the middle of the camera module 30 may be parallel to the thickness direction (i.e., the Z-axis direction) of the electronic device 01, the distribution direction of the substrate 31 and the flexible circuit board 33 may be parallel to the width direction (i.e., the X-axis direction) of the electronic device 01, and the direction perpendicular to the above two directions in the camera module 30 is parallel to the length direction (i.e., the Y-axis direction) of the electronic device 01. It can be understood that the above-mentioned arrangement of the camera module 30 is only an example, that is, the camera module 30 may also be arranged in the housing of the electronic device 01 in other ways.

[0088] In addition, the camera module 30 of the electronic device 01 can also realize auto focus (AF, Auto Focus) and optical image stabilization (OIS, Optical Image Stabilizer), so that the camera module 30 can be applied to a variety of shooting scenes. Specifically, the camera module 30 can also include a focus motor ( Figure 4 (not shown), the focus motor is disposed in the housing 35. For example, the focus motor may be a voice coil motor (VCM, Voice Coil Motor).

[0089] The focus motor is connected to the lens module 34. Figure 5 As shown, Figure 5Schematic diagram of the relative position of the lens module 34 and the image sensor 32 (parallel to the XZ plane). The focus motor can drive the lens module 34 to move along the Z axis, thereby adjusting the distance between the lens module 34 and the imaging surface 32a of the image sensor 32, so that the light emitted from the lens module 34 is focused on the imaging surface 32a to achieve automatic focus.

[0090] However, since telephoto lenses generally only rely on the movement of the lens module 34 for focusing, that is, the lens module 34 needs to have a large stroke, this will not only make the overall size of the camera module 30 larger, but will also affect the focusing speed and focusing accuracy of the camera module 30, thereby affecting the performance of the camera module 30.

[0091] To solve the above problems, the present application embodiment provides an optical lens 36, which can be applied to the above camera module 30. Figure 6 As shown, Figure 6 A schematic diagram of a planar structure of an optical lens 36 provided in an embodiment of the present application (parallel to the XZ plane). The optical lens 36 includes a focusing lens group 362 and a first optical element 361 .

[0092] The focus lens group 362 may be composed of a plurality of lenses arranged at intervals, at least one of the plurality of lenses having optical power, and the focus lens group 362 may be movable along the optical axis 360 of the optical lens 36. The first optical element 361 is fixed to the object side of the focus lens group 362, and the curvature radius of at least one of the object side surface and the image side surface of the first optical element 361 is variable.

[0093] In this way, compared with the aforementioned camera module 30 that focuses only by moving the lens module 34, the optical lens 36 provided in the present application changes the focal length of the first optical element 361 by adjusting the radius of curvature of the object side and / or image side of the first optical element 361 when focusing, and at the same time, the focusing motor synchronously drives the focusing lens group 362 to move. The change in the focal length of the first optical element 361 greatly shortens the distance that the focusing lens group 362 needs to move (i.e., the stroke of the focusing lens group 362), and the focusing speed of the optical lens 36 is significantly improved under the premise that the driving speed of the focusing motor remains unchanged. And because the stroke of the focusing lens group 362 is shortened, the size of the entire optical lens 36 is also reduced, and the size of the camera module 30 is also reduced, which is conducive to the thinness of the electronic device 01.

[0094] It is understandable that in Figure 6 In the embodiment, the optical axis 360 of the optical lens 36 extends in one direction, so that the optical lens 36 can be applied to the upright camera module 30 .

[0095] The first optical element 361 may be liquid driven, magnetically driven or driven in other ways. The first optical element 361 may have a variable curvature radius on the object side, a variable curvature radius on the image side, or a variable curvature radius on both the object side and the image side, as long as the optical focal length of the first optical element 361 can be changed, and this application does not make any special restrictions on this.

[0096] For ease of understanding, the following description is made by taking the example that the curvature radius of one of the object-side surface and the image-side surface of the first optical element 361 is variable.

[0097] See also Figure 7 As shown, Figure 7 A schematic diagram of the structure of a first optical element 361 provided in an embodiment of the present application. The first optical element 361 is a liquid lens, and may include a transparent film layer 3611, a transparent cover plate 3610, and a driving unit 3613. The transparent film layer 3611 is elastic, and the transparent film layer 3611 and the transparent cover plate 3610 are spaced apart. The driving unit 3613 surrounds the transparent film layer 3611 and the transparent cover plate 3610, and the transparent film layer 3611, the transparent cover plate 3610, and the driving unit 3613 form a receiving cavity, and the receiving cavity is filled with a first optical fluid 3614 and a second optical fluid 3615 that are immiscible with each other, and the first optical fluid 3614 and the second optical fluid 3615 are fluid.

[0098] When focusing, the shapes of the first optical fluid 3614 and the second optical fluid 3615 are changed by controlling the driving unit 3613 to apply a driving voltage to the first optical fluid 3614 and the second optical fluid 3615, so that the curvature radius of the transparent film layer 3611 can be changed within milliseconds, thereby achieving rapid adjustment of the optical focal length of the liquid lens.

[0099] To further reduce the size of the optical lens 36, see Figure 8 As shown, Figure 8 A schematic diagram of the three-dimensional structure of an optical lens 36 provided in an embodiment of the present application. The optical lens 36 may also include a light turning component 363. Among them, the focusing lens group 362, the first optical element 361 and the light turning component 363 are arranged along the extension direction of the optical axis 360, and the light turning component 363 is located on the object side of the focusing lens group 362. In this way, the optical axis 360 of the optical lens 36 can be turned and folded by using the light turning component 363, that is, the light turning component 363 can convert the thickness of the optical lens 36 along the Z-axis direction into a length parallel to the XY plane, so that the optical lens 36 can achieve a telephoto effect while maintaining a small thickness, which is conducive to the thinness of the electronic device 01.

[0100] It is understandable that one light deflection component 363 may be provided, or multiple light deflection components may be dispersedly provided on the optical path of the optical lens 36, and the selection may be reasonable according to actual needs. When there is only one light deflection component 363, the first optical element 361 may be provided on the object side of the light deflection component 363, or may be provided on the image side of the light deflection component 363. The first optical element 361 may be glued to the light deflection component 363 (the two are glued together by a light-transmitting adhesive to form a double-glued lens, so that the light energy loss when the light passes through the double-glued lens is small, and the double-glued lens can also correct spherical aberration, coma and chromatic aberration to a certain extent, thereby improving the imaging quality), or may be spaced apart from the light deflection component 363, and the present application does not make any special limitation on this.

[0101] The light deflection component 363 may be a reflector, a reflecting prism, etc., so that the optical lens 36 can be applied to the periscope camera module 30, and the present application does not make any special limitation on this.

[0102] For example, see Figure 8 As shown, Figure 8 The optical lens in the above Figure 6 A light deflection component 363 is added on the basis of the optical lens. The light deflection component 363 is a reflective prism, and is located between the first optical element 361 and the focusing lens group 362. The image side surface of the first optical element 361 and the object side surface of the light deflection component 363 are glued by a light-transmitting adhesive. At this time, the curvature radius of the object side surface of the first optical element 361 is variable. External light enters the first optical element 361 along the Z axis, enters the light deflection component 363 after being refracted by the first optical element 361, and enters the focusing lens group 362 along the X axis after being reflected by the light deflection component 363.

[0103] When focusing, the focal length of the first optical element 361 is changed by adjusting the radius of curvature of the object side surface of the first optical element 361. At the same time, the focusing lens group 362 moves synchronously along the optical axis 360, and the distance between the object side surface of the focusing lens group 362 and the image side surface of the light deflection component 363 changes. The change in the focal length of the first optical element 361 greatly shortens the distance that the focusing lens group 362 needs to move (i.e., the stroke of the focusing lens group 362), and the focusing speed of the optical lens 36 is significantly improved.

[0104] For another example, see Fig. 9 As shown, Fig. 9 A schematic diagram of the three-dimensional structure of another optical lens 36 provided in an embodiment of the present application. Fig. 9 The optical lens in the Figure 8The light deflection component 363 in the optical lens is moved to the object side of the first optical element 361, that is, the first optical element 361 is located between the light deflection component 363 and the focusing lens group 362, and the object side surface of the first optical element 361 and the image side surface of the light deflection component 363 are glued by a light-transmitting adhesive, at this time, the curvature radius of the image side surface of the first optical element 361 is variable. External light enters the light deflection component 363 along the Z axis, is reflected by the light deflection component 363, and enters the first optical element 361 along the X axis direction. After being refracted by the first optical element 361, it enters the focusing lens group 362 along the X axis direction.

[0105] When focusing, the focal length of the first optical element 361 is changed by adjusting the radius of curvature of the image side surface of the first optical element 361. At the same time, the focusing lens group 362 moves synchronously along the optical axis 360, and the distance between the object side surface of the focusing lens group 362 and the image side surface of the first optical element 361 changes. The change in the focal length of the first optical element 361 greatly shortens the distance that the focusing lens group 362 needs to move (i.e., the stroke of the focusing lens group 362), and the focusing speed of the optical lens 36 is significantly improved.

[0106] For another example, see Fig.10 As shown, Fig.10 A schematic diagram of a planar structure of another optical lens 36 provided in an embodiment of the present application (parallel to the XZ plane), Fig.10 The optical lens in the Figure 8 The first optical element 361 in the optical lens is moved to the camera decorative cover 50 to be separated from the light deflection component 363. In this way, the first optical element 361 is located outside the back cover 21, which is conducive to the thinness of the electronic device 01.

[0107] On the basis of the above, see Fig.11 As shown, Fig.11 A schematic diagram of a three-dimensional structure of another optical lens 36 provided in an embodiment of the present application. The optical lens 36 may further include a second optical element 364, and at least one of the object side surface and the image side surface of the second optical element 364 has a variable radius of curvature. The focusing lens group 362, the first optical element 361, the light deflection component 363, and the second optical element 364 are arranged along the extension direction of the optical axis 360, and the second optical element 364 is located on the object side of the focusing lens group 362, and the first optical element 361 and the second optical element 364 are respectively arranged on both sides of the light deflection component 363.

[0108] It is understandable that the first optical element 361 and the second optical element 364 can be glued to the light turning component 363, or can be spaced apart from the light turning component 363. Alternatively, one of the first optical element 361 and the second optical element 364 can be glued to the light turning component 363, and the other can be spaced apart from the light turning component 363. This application does not specifically limit this.

[0109] The second optical element 364 may have a variable curvature radius on the object side, a variable curvature radius on the image side, or a variable curvature radius on both the object side and the image side, as long as the optical focal length of the second optical element 364 can be changed, and the present application does not impose any special limitation on this.

[0110] The structure of the second optical element 364 can refer to the structure of the first optical element 361, which will not be described in detail. The second optical element 364 can also adopt a structure different from that of the first optical element 361, which is not specifically limited in the present application.

[0111] For ease of understanding, the following description is made by taking the example that the curvature radius of one of the object-side surface and the image-side surface of the second optical element 364 is variable.

[0112] For example, see Fig.11 As shown, Fig.11 The optical lens in the above Figure 8 A second optical element 364 is added on the basis of the optical lens, and the object side surface of the second optical element 364 is glued to the image side surface of the light deflection component 363 by a light-transmitting adhesive. At this time, the curvature radius of the object side surface of the first optical element 361 is variable, and the curvature radius of the image side surface of the second optical element 364 is variable. External light enters the first optical element 361 along the Z axis, enters the light deflection component 363 after being refracted by the first optical element 361, enters the second optical element 364 along the X axis after being reflected by the light deflection component 363, and enters the focusing lens group 362 along the X axis after being refracted by the second optical element 364.

[0113] When focusing, the focal length of the first optical element 361 is changed by adjusting the radius of curvature of the object side surface of the first optical element 361, and the focal length of the second optical element 364 is changed by adjusting the radius of curvature of the image side surface of the second optical element 364. At the same time, the focusing lens group 362 moves synchronously along the optical axis 360, and the distance between the object side surface of the focusing lens group 362 and the image side surface of the second optical element 364 changes. The change in the focal length of the first optical element 361 and the second optical element 364 further shortens the distance that the focusing lens group 362 needs to move (i.e., the stroke of the focusing lens group 362), and the focusing speed of the optical lens 36 is significantly improved.

[0114] For some possible implementations, please continue to see Figure 6 ,as well as Figures 8 to 11 As shown, the optical lens 36 may further include an infrared filter 366. The infrared filter 366 is located on the image side of the last lens in the optical lens 36. For example, Fig.11 The mid-infrared filter 366 is located between the focus lens group 362 and the image sensor 32. The infrared filter 366 can effectively filter out infrared light and only allow visible light to enter the image sensor 32, thereby improving image quality and clarity. In addition, it can also prevent infrared light from generating heat on the image sensor 32, thereby preventing infrared light from affecting image quality and clarity.

[0115] For some possible implementations, please continue to see Fig.11 As shown, the optical lens 36 may further include an aperture 365. The aperture 365 may be set at an appropriate position as required to control the amount of light entering the optical imaging lens. For example, the aperture 365 may be set on a lens in the focusing lens group 362 close to the first optical element 361. With this arrangement, the aperture 365 can be used to improve the clarity of imaging, control the range of the imaging object space, and control the brightness of the image plane. In addition, by adjusting the size of the aperture 365, a larger entrance pupil diameter can be obtained, so that when the focal length of the optical lens 36 remains unchanged, a larger aperture and diffraction limit value can be obtained, which is conducive to improving the imaging quality of the optical lens 36.

[0116] In some possible implementations, the optical lens 36 satisfies the following relationship: 0.2mm≤CL≤0.5mm. For example, the value of CL can be 0.20mm, 0.22mm, 0.25mm, 0.283mm, 0.315mm, 0.35mm, 0.38mm, 0.395mm, 0.42mm, 0.46mm, 0.49mm, 0.50mm, etc. CL is the distance between the first optical element 361 and the light deflection component 363 along the extension direction of the optical axis 360.

[0117] The above relationship limits the range of the distance between the first optical element 361 and the light deflection component 363 in the optical lens 36. When the first optical element 361 is set on the camera decorative cover 50, it can minimize the volume of the optical lens 36 while avoiding interference between the light deflection component 363 and the back cover 21 or the camera decorative cover 50.

[0118] In some possible implementations, the optical lens 36 also satisfies the following relationship: 0.95<EFL1 / EFL2<1.05. For example, the value of EFL1 / EFL2 can be 0.951, 0.955, 0.972, 0.980, 0.985, 0.990, 0.993, 0.998, 1.0, 1.01, 1.015, 1.022, 1.035, 1.041, 1.046, 1.049, etc. Among them, EFL1 is the effective focal length of the optical lens 36 when imaging at infinity, and EFL2 is the effective focal length of the optical lens 36 when imaging at a close distance.

[0119] The above relationship limits the ratio range of the effective focal length of the optical lens 36 during infinite imaging to the effective focal length of the optical lens 36 during close-range imaging, so that the focal length change value of the optical lens 36 is small when focusing, thereby having a slight impact on the imaging effect.

[0120] In some possible implementations, the optical lens 36 also satisfies the following relationship: EFL1 / AL>14. For example, the value of EFL1 / AL can be 14.01, 14.05, 14.2, 14.5, 15.3, 16, 18.2, 20, 22.1, 23.5, 25.6, 27.5, 31, 35.8, 40.5, 48.8, etc., where AL is the stroke of the focus lens group 362.

[0121] The above relationship limits the ratio of the effective focal length of the optical lens 36 to the stroke of the focusing lens group 362 when imaging at infinity to be higher than the lower limit of 14, thereby reasonably allocating the optical focal length of the first optical element 361 and the focusing lens group 362, thereby reducing the stroke of the focusing lens group 362 when moving for focusing, and at the same time reducing the tolerance sensitivity of the first optical element 361 and the focusing lens group 362, which is beneficial to improving the resolution of the optical lens 36.

[0122] In some possible implementations, the optical lens 36 satisfies the following relationship: TL≤200mm. For example, the value of TL can be 200mm, 198mm, 197mm, 195mm, 192mm, 189mm, 186mm, 185mm, 182mm, 173mm, 165mm, 151mm, 135mm, 116mm, 100mm, 92mm, 63mm, 50mm, etc. Among them, TL is the object distance of the optical lens 36 when focusing at a close distance. It can be seen that the optical lens 36 provided in the present application can be applied to macro photography with an object distance of less than 200mm.

[0123] In some possible implementations, the optical lens 36 also satisfies the following relationship: AL≤0.7mm. For example, the value of AL can be 0.7mm, 0.68mm, 0.65mm, 0.60mm, 0.55mm, 0.52mm, 0.46mm, 0.30mm, 0.22mm, 0.15mm, etc. Through the above structural design of the present application, the stroke of the focus lens group 362 can be limited to within 0.7mm, and the size of the optical lens 36 is also greatly reduced, which is conducive to the thinness of the electronic device 01.

[0124] Based on the above content, the camera module 30 using the above optical lens 36 (the optical lens 36 satisfies the above relationship, and the first optical element 361 and the second optical element 364 are both liquid lenses, and the light deflection component 363 is a reflective prism) is exemplified below.

[0125] Example 1

[0126] Example 1 of the present application provides a camera module 30, and the camera module 30 includes an optical lens 36. Fig.12 As shown, Fig.12 The schematic diagram of the planar structure of the optical lens 36 provided for Example 1 (parallel to the XZ plane) is shown. The optical lens 36 includes a first optical element 361 , a light deflection component 363 , a focusing lens group 362 and an infrared filter 366 , which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36 .

[0127] The first optical element 361 has an object side surface S1 and an image side surface S2, and the light deflection component 363 has an object side surface S3 and an image side surface S4. The image side surface S2 of the first optical element 361 and the object side surface S3 of the light deflection component 363 are glued to form a glued surface, and the curvature radius of the object side surface S1 of the first optical element 361 is variable.

[0128] The focusing lens group 362 includes four lenses, namely, a first lens 3621, a second lens 3622, a third lens 3623 and a fourth lens 3624. The first lens 3621 has positive focal power, the second lens 3622 has negative focal power, the third lens 3623 has negative focal power, and the fourth lens 3624 has positive focal power. The first lens 3621 has an object side surface S6 and an image side surface S7, the second lens 3622 has an object side surface S8 and an image side surface S9, the third lens 3623 has an object side surface S10 and an image side surface S11, and the fourth lens 3624 has an object side surface S12 and an image side surface S13.

[0129] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S5. Fig.12It can be seen that since the plane S5 where the aperture 365 is located intersects with the object side surface S6 of the first lens 3621 of the focusing lens group 362, the distance between the plane S5 where the aperture 365 is located and the object side surface S6 of the first lens 3621 is a negative value, specifically -0.270 mm.

[0130] The infrared filter 366 has an object-side surface S14 and an image-side surface S15.

[0131] Table 1a below gives the parameters of each lens and infrared filter 366 before the optical lens 36 is focused (when imaging at infinity) in Example 1, as shown below:

[0132] Table 1a

[0133]

[0134] Table 1b below gives basic parameters of the optical lens 36 in Example 1 before focusing (when imaging at infinity), as shown below:

[0135] Table 1b

[0136]

[0137] Table 1c below gives the parameters of each lens and infrared filter 366 after the optical lens 36 in Example 1 is focused (when imaging at a close distance), as shown below:

[0138] Table 1c

[0139]

[0140] Table 1d below gives basic parameters of the optical lens 36 in Example 1 after focusing (when imaging at close range), as shown below:

[0141] Table 1d

[0142]

[0143] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0144] ;

[0145] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0146] Table 1e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 of the aspheric surface types that can be used for each lens group in Example 1.

[0147] Table 1e

[0148]

[0149] According to the parameter values ​​in the above tables, in this example:

[0150] Before the optical lens 36 is zoomed, the curvature radius of the object side surface S1 of the first optical element 361 is infinite, and the first optical element 361 has no optical power. After zooming, the curvature radius of the object side surface S1 of the first optical element 361 becomes 111.039 mm, and the first optical element 361 has positive optical power.

[0151] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 1a and the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 1c, that is, AL=3.596mm-3.000mm=0.596mm, satisfying AL≤0.7mm.

[0152] From Table 1b and Table 1d above, it can be seen that EFL1 / EFL2=10.13mm / 10.15mm=0.998, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.13mm / 0.596mm=16.997, which satisfies EFL1 / AL>14.

[0153] See also Fig.13 and Fig.14 As shown, Fig.13 This is the MTF curve of the optical lens 36 in Example 1 when imaging at infinity. Fig.14 This is the MTF curve of the optical lens 36 in Example 1 when imaging at close range. Among them, the horizontal axis is the spatial frequency, the vertical axis is the modulus of OTF (the value of the vertical axis is often understood as the MTF value, and the maximum value is 1), and the reference wavelength of the light is 546nm. It can be seen that the low-frequency MTF value of the optical lens 36 provided in Example 1 of this application in the visible band is not less than 0.85, and the contrast and resolution are excellent. The mid-frequency MTF value is not less than 0.55, and the contrast and resolution are balanced. In summary, the optical lens 36 provided in Example 1 of this application has good optical performance.

[0154] Example 2

[0155] Example 2 of the present application provides a camera module 30, and the camera module 30 includes an optical lens 36. Fig.15 As shown, Fig.15The schematic diagram of the planar structure of the optical lens 36 provided for Example 2 (parallel to the XZ plane). The optical lens 36 includes a first optical element 361, a light deflection component 363, a focusing lens group 362 and an infrared filter 366, which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36. Among them, the first optical element 361 has an object side surface S1 and an image side surface S2, and the light deflection component 363 has an object side surface S3 and an image side surface S4. The image side surface S2 of the first optical element 361 and the object side surface S3 of the light deflection component 363 are glued to form a glued surface, and the curvature radius of the object side surface S1 of the first optical element 361 is variable.

[0156] The focusing lens group 362 includes five lenses, namely, a first lens 3621, a second lens 3622, a third lens 3623, a fourth lens 3624, and a fifth lens 3625. The first lens 3621 has positive focal power, the second lens 3622 has negative focal power, the third lens 3623 has negative focal power, the fourth lens 3624 has positive focal power, and the fifth lens 3625 has positive focal power. The first lens 3621 has an object side surface S6 and an image side surface S7, the second lens 3622 has an object side surface S8 and an image side surface S9, the third lens 3623 has an object side surface S10 and an image side surface S11, the fourth lens 3624 has an object side surface S12 and an image side surface S13, and the fifth lens 3625 has an object side surface S14 and an image side surface S15.

[0157] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S5. Fig.15 It can be seen that since the plane S5 where the aperture 365 is located intersects with the object side surface S6 of the first lens 3621 of the focusing lens group 362, the distance between the plane S5 where the aperture 365 is located and the object side surface S6 of the first lens 3621 is a negative value, specifically -0.279 mm.

[0158] The infrared filter 366 has an object-side surface S16 and an image-side surface S17.

[0159] Table 2a below gives the parameters of each lens and infrared filter 366 before the optical lens 36 in Example 2 is focused (when imaging at infinity), as shown below:

[0160] Table 2a

[0161]

[0162] Table 2b below gives basic parameters of the optical lens 36 in Example 2 before focusing (when imaging at infinity), as shown below:

[0163] Table 2b

[0164]

[0165] Table 2c below gives the parameters of each lens and infrared filter 366 after focusing (when imaging at a close distance) in Example 2, as shown below:

[0166] Table 2c

[0167]

[0168] Table 2d below gives basic parameters of the optical lens 36 in Example 2 after focusing (when imaging at close range), as shown below:

[0169] Table 2d

[0170]

[0171] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0172] ;

[0173] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0174] Table 2e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric surface shapes of each lens group in Example 2.

[0175] Table 2e

[0176]

[0177] According to the parameter values ​​in the above tables, in this example:

[0178] Before the optical lens 36 is zoomed, the curvature radius of the object side surface S1 of the first optical element 361 is infinite, and the first optical element 361 has no optical power. After zooming, the curvature radius of the object side surface S1 of the first optical element 361 becomes 101.299 mm, and the first optical element 361 has positive optical power.

[0179] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S15 of the fifth lens 3625 and the object side surface S16 of the infrared filter 366 in the above Table 2a and the distance between the image side surface S15 of the fifth lens 3625 and the object side surface S16 of the infrared filter 366 in the above Table 2c, that is, AL=3.563mm-3.000mm=0.563mm, satisfying AL≤0.7mm.

[0180] From Table 2b and Table 2d above, it can be seen that EFL1 / EFL2=10.17mm / 10.22mm=0.995, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.17mm / 0.563mm=18.064, which satisfies EFL1 / AL>14.

[0181] The MTF curve of the optical lens 36 in Example 2 can refer to Example 1, and will not be described in detail here.

[0182] Example 3

[0183] Example 3 of the present application provides a camera module 30, and the camera module 30 includes an optical lens 36. Fig.16 As shown, Fig.16 The schematic diagram of the planar structure of the optical lens 36 provided for Example 3 (parallel to the XZ plane) is shown. The optical lens 36 includes a first optical element 361 , a light deflection component 363 , a focusing lens group 362 and an infrared filter 366 , which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36 .

[0184] The first optical element 361 has an object side surface S1 and an image side surface S2, and the light deflection component 363 has an object side surface S3 and an image side surface S4. The image side surface S2 of the first optical element 361 and the object side surface S3 of the light deflection component 363 are glued to form a glued surface, and the curvature radius of the object side surface S1 of the first optical element 361 is variable.

[0185] The focusing lens group 362 includes three lenses, namely, a first lens 3621, a second lens 3622, and a third lens 3623. The first lens 3621 has positive optical power, the second lens 3622 has negative optical power, and the third lens 3623 has positive optical power. The first lens 3621 has an object side surface S6 and an image side surface S7, the second lens 3622 has an object side surface S8 and an image side surface S9, and the third lens 3623 has an object side surface S10 and an image side surface S11.

[0186] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S5. Fig.16 It can be seen that since the plane S5 where the aperture 365 is located intersects with the object side surface S6 of the first lens 3621 of the focusing lens group 362, the distance between the plane S5 where the aperture 365 is located and the object side surface S6 of the first lens 3621 is a negative value, specifically -0.833 mm.

[0187] The infrared filter 366 has an object-side surface S12 and an image-side surface S13.

[0188] Table 3a below gives the parameters of each lens and infrared filter 366 in Example 3 before the optical lens 36 is focused (when imaging at infinity), as shown below:

[0189] Table 3a

[0190]

[0191] Table 3b below gives basic parameters of the optical lens 36 in Example 3 before focusing (when imaging at infinity), as shown below:

[0192] Table 3b

[0193]

[0194] Table 3c below gives the parameters of each lens and infrared filter 366 after focusing (when imaging at a close distance) in Example 3, as shown below:

[0195] Table 3c

[0196]

[0197] Table 3d below gives basic parameters of the optical lens 36 in Example 3 after focusing (when imaging at close range), as shown below:

[0198] Table 3d

[0199]

[0200] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0201] ;

[0202] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0203] Table 3e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric surface shapes of each lens group in Example 3.

[0204] Table 3e

[0205]

[0206] According to the parameter values ​​in the above tables, in this example:

[0207] Before the optical lens 36 is zoomed, the curvature radius of the object side surface S1 of the first optical element 361 is infinite, and the first optical element 361 has no optical power. After zooming, the curvature radius of the object side surface S1 of the first optical element 361 becomes 143.862 mm, and the first optical element 361 has positive optical power.

[0208] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S11 of the third lens 3623 and the object side surface S12 of the infrared filter 366 in the above Table 3a and the distance between the image side surface S11 of the third lens 3623 and the object side surface S12 of the infrared filter 366 in the above Table 3c, that is, AL=3.699mm-3.000mm=0.699mm, satisfying AL≤0.7mm.

[0209] From Table 3b and Table 3d above, it can be seen that EFL1 / EFL2=10.13mm / 10.11mm=1.002, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.13mm / 0.699mm=14.492, which satisfies EFL1 / AL>14.

[0210] The MTF curve of the optical lens 36 in Example 3 can refer to Example 1, and will not be described in detail here.

[0211] Example 4

[0212] Example 4 of the present application provides a camera module 30, which includes an optical lens 36. Fig.17 As shown, Fig.17 The schematic diagram of the planar structure of the optical lens 36 provided for Example 4 (parallel to the XZ plane) is shown. The optical lens 36 comprises a first optical element 361 , a light deflection component 363 , a focusing lens group 362 and an infrared filter 366 which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36 .

[0213] The first optical element 361 has an object side surface S1 and an image side surface S2, and the light deflection component 363 has an object side surface S3 and an image side surface S4. The first optical element 361 is fixed on the camera decorative cover 50, that is, the first optical element 361 and the light deflection component 363 are spaced apart, and the curvature radius of the object side surface S1 of the first optical element 361 is variable.

[0214] The focusing lens group 362 includes four lenses, namely, a first lens 3621, a second lens 3622, a third lens 3623 and a fourth lens 3624. The first lens 3621 has positive focal power, the second lens 3622 has negative focal power, the third lens 3623 has negative focal power, and the fourth lens 3624 has positive focal power. The first lens 3621 has an object side surface S6 and an image side surface S7, the second lens 3622 has an object side surface S8 and an image side surface S9, the third lens 3623 has an object side surface S10 and an image side surface S11, and the fourth lens 3624 has an object side surface S12 and an image side surface S13.

[0215] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S5. Fig.17 It can be seen that since the plane S5 where the aperture 365 is located intersects with the object side surface S6 of the first lens 3621 of the focusing lens group 362, the distance between the plane S5 where the aperture 365 is located and the object side surface S6 of the first lens 3621 is a negative value, specifically -0.094 mm.

[0216] The infrared filter 366 has an object-side surface S14 and an image-side surface S15.

[0217] Table 4a below gives the parameters of each lens and infrared filter 366 in Example 4 before the optical lens 36 is focused (when imaging at infinity), as shown below:

[0218] Table 4a

[0219]

[0220] Table 4b below gives basic parameters of the optical lens 36 in Example 4 before focusing (when imaging at infinity), as shown below:

[0221] Table 4b

[0222]

[0223] Table 4c below gives the parameters of each lens and infrared filter 366 after focusing (when imaging at a close distance) in Example 4, as shown below:

[0224] Table 4c

[0225]

[0226] Table 4d below gives basic parameters of the optical lens 36 in Example 4 after focusing (when imaging at a close distance), as shown below:

[0227] Table 4d

[0228]

[0229] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0230] ;

[0231] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0232] Table 4e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric surface types of each lens group in Example 4.

[0233] Table 4e

[0234]

[0235] According to the parameter values ​​in the above tables, in this example:

[0236] Before the optical lens 36 is zoomed, the curvature radius of the object side surface S1 of the first optical element 361 is infinite, and the first optical element 361 has no optical power. After zooming, the curvature radius of the object side surface S1 of the first optical element 361 becomes -140.508 mm, and the first optical element 361 has negative optical power.

[0237] The distance CL between the first optical element 361 and the light deflecting component 363 along the optical axis, that is, the distance between the image side surface S2 of the first optical element 361 and the object side surface S3 of the light deflecting component 363 is 0.500 mm, satisfying 0.2 mm≤CL≤0.5 mm.

[0238] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 4a and the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 4c, that is, AL=3.676mm-3.000mm=0.676mm, satisfying AL≤0.7mm.

[0239] From Table 4b and Table 4d above, it can be seen that EFL1 / EFL2=10.13mm / 10.14mm=0.999, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.13mm / 0.676mm=14.985, which satisfies EFL1 / AL>14.

[0240] See also Fig.18 and Fig.19 As shown, Fig.18 This is the MTF curve of the optical lens 36 in Example 4 when imaging at infinity. Fig.19 This is the MTF curve of the optical lens 36 in Example 4 when imaging at a close distance. It can be seen that the low-frequency MTF value of the optical lens 36 provided in Example 4 of the present application in the visible band is not less than 0.85, and the contrast and resolution are excellent. The mid-frequency MTF value is not less than 0.5, and the contrast and resolution are balanced. In summary, the optical lens 36 provided in Example 4 of the present application has good optical performance.

[0241] Example 5

[0242] Example 5 of the present application provides a camera module 30, and the camera module 30 includes an optical lens 36. Fig. 20 As shown, Fig. 20 The schematic diagram of the planar structure of the optical lens 36 provided for Example 5 (parallel to the XZ plane) is shown. The optical lens 36 includes a light deflection component 363, a first optical element 361, a focusing lens group 362 and an infrared filter 366 which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36.

[0243] The light deflection component 363 has an object side surface S1 and an image side surface S2, and the first optical element 361 has an object side surface S3 and an image side surface S4. The image side surface S2 of the light deflection component 363 and the object side surface S3 of the first optical element 361 are glued to form a glued surface, and the curvature radius of the image side surface S4 of the first optical element 361 is variable.

[0244] The focusing lens group 362 includes four lenses, namely, a first lens 3621, a second lens 3622, a third lens 3623 and a fourth lens 3624. The first lens 3621 has positive focal power, the second lens 3622 has negative focal power, the third lens 3623 has negative focal power, and the fourth lens 3624 has positive focal power. The first lens 3621 has an object side surface S6 and an image side surface S7, the second lens 3622 has an object side surface S8 and an image side surface S9, the third lens 3623 has an object side surface S10 and an image side surface S11, and the fourth lens 3624 has an object side surface S12 and an image side surface S13.

[0245] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S5. Fig. 20 It can be seen that since the plane S5 where the aperture 365 is located intersects with the object side surface S6 of the first lens 3621 of the focusing lens group 362, the distance between the plane S5 where the aperture 365 is located and the object side surface S6 of the first lens 3621 is a negative value, specifically -0.243 mm.

[0246] The infrared filter 366 has an object-side surface S14 and an image-side surface S15.

[0247] Table 5a below gives the parameters of each lens and infrared filter 366 in Example 5 before the optical lens 36 is focused (when imaging at infinity), as shown below:

[0248] Table 5a

[0249]

[0250] Table 5b below gives basic parameters of the optical lens 36 in Example 5 before focusing (when imaging at infinity), as shown below:

[0251] Table 5b

[0252]

[0253] Table 5c below gives the parameters of each lens and infrared filter 366 after the optical lens 36 in Example 5 is focused (when imaging at a close distance), as shown below:

[0254] Table 5c

[0255]

[0256] Table 5d below gives basic parameters of the optical lens 36 in Example 5 after focusing (when imaging at a close distance), as shown below:

[0257] Table 5d

[0258]

[0259] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0260] ;

[0261] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0262] Table 5e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric surface shapes of each lens group in Example 5.

[0263] Table 5e

[0264]

[0265] According to the parameter values ​​in the above tables, in this example:

[0266] Before the optical lens 36 is zoomed, the curvature radius of the image side surface S4 of the first optical element 361 is infinite, and the first optical element 361 has no optical power. After zooming, the curvature radius of the image side surface S4 of the first optical element 361 becomes -165.995 mm, and the first optical element 361 has positive optical power.

[0267] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 5a and the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 5c, that is, AL=3.698mm-3.000mm=0.698mm, satisfying AL≤0.7mm.

[0268] From Table 5b and Table 5d above, it can be seen that EFL1 / EFL2=10.13mm / 9.92mm=1.022, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.13mm / 0.698mm=14.513, which satisfies EFL1 / AL>14.

[0269] See also Fig.21 and Fig. 22 As shown, Fig.21 This is the MTF curve of the optical lens 36 in Example 5 when imaging at infinity. Fig. 22 This is the MTF curve of the optical lens 36 in Example 5 when imaging at a close distance. It can be seen that the low-frequency MTF value of the optical lens 36 provided in Example 5 of this application in the visible band is not less than 0.85, and the contrast and resolution are excellent. The mid-frequency MTF value is not less than 0.6, and the contrast and resolution are balanced. In summary, the optical lens 36 provided in Example 5 of this application has good optical performance.

[0270] Example 6

[0271] Example 6 of the present application provides a camera module 30, and the camera module 30 includes an optical lens 36. Fig.23 As shown, Fig.23 The schematic diagram of the planar structure of the optical lens 36 provided for Example 6 (parallel to the XZ plane). The optical lens 36 includes a first optical element 361, a light deflection component 363, a second optical element 364, a focusing lens group 362 and an infrared filter 366 which are sequentially distributed along the extension direction of the optical axis 360 of the optical lens 36.

[0272] The first optical element 361 has an object side surface S1 and an image side surface S2, the light deflection component 363 has an object side surface S3 and an image side surface S4, and the second optical element 364 has an object side surface S5 and an image side surface S6. The image side surface S2 of the first optical element 361 and the object side surface S3 of the light deflection component 363 are glued to form a glued surface, and the curvature radius of the object side surface S1 of the first optical element 361 is variable. The object side surface S5 of the second optical element 364 and the image side surface S4 of the light deflection component 363 are glued to form a glued surface, and the curvature radius of the image side surface S6 of the second optical element 364 is variable.

[0273] The focusing lens group 362 includes four lenses, namely, a first lens 3621, a second lens 3622, a third lens 3623 and a fourth lens 3624. The first lens 3621 has positive focal power, the second lens 3622 has negative focal power, the third lens 3623 has negative focal power, and the fourth lens 3624 has positive focal power. The first lens 3621 has an object side surface S8 and an image side surface S9, the second lens 3622 has an object side surface S10 and an image side surface S11, the third lens 3623 has an object side surface S12 and an image side surface S13, and the fourth lens 3624 has an object side surface S14 and an image side surface S15.

[0274] The aperture 365 is disposed on the first lens 3621, and the plane where the aperture 365 is located is S7. Fig.23 It can be seen that since the plane S7 where the aperture 365 is located intersects with the object side surface S8 of the first lens 3621 of the focusing lens group 362, the distance between the plane S7 where the aperture 365 is located and the object side surface S8 of the first lens 3621 is a negative value, specifically -0.636 mm.

[0275] The infrared filter 366 has an object-side surface S16 and an image-side surface S17.

[0276] Table 6a below gives the parameters of each lens and infrared filter 366 before the optical lens 36 is focused (when imaging at infinity) in Example 6, as shown below:

[0277] Table 6a

[0278]

[0279] Table 6b below gives basic parameters of the optical lens 36 in Example 6 before focusing (when imaging at infinity), as shown below:

[0280] Table 6b

[0281]

[0282] Table 6c below gives the parameters of each lens and infrared filter 366 after focusing (when imaging at a close distance) in Example 6, as shown below:

[0283] Table 6c

[0284]

[0285] The following table 6d gives the basic parameters of the optical lens 36 in Example 6 after focusing (when imaging at a close distance), as shown below:

[0286] Table 6d

[0287]

[0288] The sagittal height of the aspheric surface in each of the above lens groups can be calculated by the following formula:

[0289] ;

[0290] Among them, Z is the aspheric height, r is the radial coordinate of the aspheric surface, c is the curvature of the fixed point ball of the aspheric surface, K is the quadratic surface constant, for Aspheric constant of order.

[0291] Table 6e below gives the coefficients k, A2, A4, A6, A8, A10, A12, A14, A16, and A18 that can be used for the aspheric surface shapes of each lens group in Example 6.

[0292] Table 6e

[0293]

[0294] According to the parameter values ​​in the above tables, in this example:

[0295] Before the optical lens 36 is zoomed, the radius of curvature of the object side surface S1 of the first optical element 361 is infinite, the radius of curvature of the image side surface S6 of the second optical element 364 is infinite, and both the first optical element 361 and the second optical element 364 have no optical power. After zooming, the radius of curvature of the object side surface S1 of the first optical element 361 becomes 41.983 mm, and the first optical element 361 has a positive optical power. The radius of curvature of the image side surface S6 of the second optical element 364 becomes -88.670 mm, and the second optical element 364 has a negative optical power.

[0296] The travel AL of the focusing lens group 362 is the difference between the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 6a and the distance between the image side surface S13 of the fourth lens 3624 and the object side surface S14 of the infrared filter 366 in the above Table 6c, that is, AL=3.464mm-3.000mm=0.464mm, satisfying AL≤0.7mm.

[0297] From Table 6b and Table 6d above, it can be seen that EFL1 / EFL2=10.13mm / 10.52mm=0.963, which satisfies 0.95<EFL1 / EFL2<1.05. EFL1 / AL=10.13mm / 0.464mm=21.832, which satisfies EFL1 / AL>14.

[0298] See also Fig.24 and Fig.25 As shown, Fig.24 This is the MTF curve of the optical lens 36 in Example 6 when imaging at infinity. Fig.25 This is the MTF curve of the optical lens 36 in Example 6 when imaging at close range. It can be seen that the low-frequency MTF value of the optical lens 36 provided in Example 6 of the present application in the visible band is not less than 0.85, and the contrast and resolution are excellent. The mid-frequency MTF value is not less than 0.5, and the contrast and resolution are balanced. In summary, the optical lens 36 provided in Example 6 of the present application has good optical performance.

[0299] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0300] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical lens, characterized in that: include: A focusing lens group, wherein the focusing lens group includes at least one lens with optical power, and the focusing lens group can move along the optical axis of the optical lens; a first optical element, wherein the first optical element is fixed to the object side of the focusing lens group, and the curvature radius of at least one of the object side surface and the image side surface of the first optical element is variable; The optical lens further comprises a light-bend component, the focusing lens group, the first optical element and the light-bend component are arranged along the extension direction of the optical axis, and the light-bend component is located on the object side of the focusing lens group; The optical lens further comprises a second optical element, wherein at least one of an object side surface and an image side surface of the second optical element has a variable curvature radius; The focusing lens group, the first optical element, the light deflection component and the second optical element are arranged along the extension direction of the optical axis, and the second optical element is located on the object side of the focusing lens group, and the first optical element and the second optical element are respectively arranged on both sides of the light deflection component; The optical lens satisfies the following relationship: 0.95<EFL1 / EFL2<1.05; Among them, EFL1 is the effective focal length of the optical lens when imaging at infinity; EFL2 is the effective focal length of the optical lens when imaging at close range.

2. The optical lens according to claim 1, characterized in that: The light deflection component is a reflecting prism.

3. The optical lens according to claim 1 or 2, characterized in that: The first optical element is located at the object side of the light bending component and is spaced apart from the light bending component.

4. The optical lens according to claim 1 or 2, characterized in that: The optical lens further comprises an infrared filter, and along the extending direction of the optical axis of the optical lens, the infrared filter is located on the image side of the last lens in the optical lens.

5. The optical lens according to claim 1 or 2, characterized in that: The optical lens also includes a diaphragm, and the diaphragm is arranged on the focusing lens group.

6. The optical lens according to claim 1 or 2, characterized in that: The first optical element includes a transparent film layer, a transparent cover plate and a driving unit, the transparent film layer and the transparent cover plate are arranged at intervals, the driving unit is arranged around the transparent film layer and the transparent cover plate, the transparent film layer, the cover plate and the driving unit form a containing cavity, the containing cavity is filled with a first optical fluid and a second optical fluid that are immiscible with each other, and the driving unit is used to apply a driving voltage to the first optical fluid and the second optical fluid to change the shapes of the first optical fluid and the second optical fluid.

7. The optical lens according to claim 3, characterized in that: The optical lens satisfies the following relationship: 0.2mm≤CL≤0.5mm; Wherein, CL is the distance between the first optical element and the light deflection component along the extension direction of the optical axis.

8. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: EFL1 / AL>14; Wherein, EFL1 is the effective focal length of the optical lens when imaging at infinity; AL is the stroke of the focusing lens group.

9. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: TL≤200mm; Wherein, TL is the object distance of the optical lens during close-range imaging.

10. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following relationship: AL≤0.7mm; Wherein, AL is the travel of the focusing lens group.

11. A camera module, characterized in that: include: substrate; An image sensor is disposed on the substrate, and the image sensor has an imaging surface; The optical lens is the optical lens according to any one of claims 1 to 10, wherein the optical lens is electrically connected to the substrate, and the image side of the optical lens faces the imaging surface.

12. An electronic device, characterized in that: include: case; A mainboard, disposed in the housing; The camera module is the camera module according to claim 11, wherein the camera module is arranged in the shell and electrically connected to the mainboard.

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