Optical lens, camera module and electronic equipment

Abstract

The invention provides an optical lens, a camera module and an electronic device, the optical lens comprises a front lens group, a first reflection member (18) and a rear lens group which are sequentially arranged along a direction from an object side to an image side, and the first reflection member (18) is used for reflecting light from the front lens group to the rear lens group; the front lens group is a fixed lens group, and the first reflector (18) is rotatably arranged in the lens to realize optical anti-shake. While normal optical anti-shake is realized, the size of the optical lens in the Z-axis direction can be reduced, that is, the length of the optical lens can be reduced, and convenience is brought to the structural design in the electronic equipment.

Description

Technical Field

[0001] The present application relates to the technical field of photographing equipment, and in particular to an optical lens, a camera module and an electronic device. Background Art

[0002] With the advancement of science and technology and economic development, people have higher and higher requirements for the camera function of portable electronic devices. They not only require the camera module equipped with the electronic device to achieve telephoto shooting, but also require the electronic device to have the function of optical image stabilization (OIS) to improve the quality of photos and enhance the user's photo experience.

[0003] Figure 4 An optical lens with an optical image stabilization function is shown, the optical lens comprising a prism 1a and a plurality of lenses 1b disposed on the image side of the prism 1a, the plurality of lenses 1b forming an imaging lens group and imaging light on an image sensor 2. An anti-shake motor (not shown) can drive the prism 1a to perform shake compensation to improve shooting quality.

[0004] At present, in order to facilitate anti-shake design, the prism 1a is usually set at the object side edge of the optical path, and the multiple lenses 1b for imaging are all set at the image side of the prism 1a. Since the number of lenses 1b is large and they need to be set at intervals to achieve autofocus, the optical lens Figure 4 The Z-axis direction has a large size, which makes the optical lens relatively long, which is disadvantageous to the internal structural design of the electronic device. Summary of the invention

[0005] The embodiments of the present application provide an optical lens, a camera module, and an electronic device, which can reduce the size of the optical lens in the Z-axis direction while achieving normal optical image stabilization, that is, can reduce the length of the optical lens, thereby facilitating the internal structural design of the electronic device.

[0006] In a first aspect, an optical lens is provided, comprising: a front lens group, a first reflector, and a rear lens group arranged in sequence from the object side to the image side, the first reflector being used to reflect light from the front lens group to the rear lens group; the front lens group is a fixed lens group, and the first reflector is rotatably configured in the lens to achieve optical image stabilization.

[0007] The optical lens provided in the embodiment of the present application is provided with a front lens group on the object side of the first reflector, and the front lens group includes at least one lens, that is, some lenses of the optical lens can be provided on the object side of the first reflector, rather than all lenses provided on the image side of the first reflector, so that since the number of lenses provided on the image side of the optical lens is reduced, the size of the optical lens in the Z-axis direction can be reduced, that is, the length of the optical lens can be reduced. In addition, the arrangement space of other components inside the electronic device can be expanded, the internal structure of the electronic device is effectively optimized, the difficulty of the internal structural design and layout of the electronic device is reduced, and it is conducive to the miniaturization and thinness design of the electronic device, which can improve the user experience.

[0008] The first reflector is used to reflect the light from the front lens group to the rear lens group, so that the optical lens can achieve a periscope structural layout. The first reflector is rotatably configured in the lens, and can rotate under the drive of the anti-shake motor, thereby achieving optical image stabilization and improving the shooting quality of the optical lens. Since the front lens group is a fixed lens group, the anti-shake motor only needs to drive the first reflector when performing optical image stabilization, and does not need to drive the front lens group and the rear lens group. The moving parts of the optical image stabilization can be simplified, so that the workload of the anti-shake motor is small, the design requirements for the motor are reduced, and the design of the anti-shake motor and the camera module becomes easier. Since the lens does not participate in jitter compensation, the number of movable lenses can be reduced, so that more lenses can be fixedly set on the optical path, and the relative positions of more lenses become fixed, which can reduce the influence of tolerance on the imaging point and improve the imaging stability, so that the optical lens provided in the embodiment of the present application has good imaging quality and high imaging clarity.

[0009] The optical lens provided in the embodiment of the present application optimizes the lens structure and can reduce the size of the optical lens in the Z-axis direction while achieving normal optical image stabilization, that is, it can reduce the length of the optical lens, bringing convenience to the internal structural design of the electronic device. The optical lens can also facilitate the design of the anti-shake motor and the camera module, and has better imaging quality.

[0010] In one possible implementation, the optical lens has an exit optical axis located on the image side of the center point of the first reflector, and the first reflector is configured to rotate around a rotation point; the projection point of the rotation point on the straight line where the exit optical axis is located is located on the exit optical axis; or, the projection point of the rotation point on the straight line where the exit optical axis is located is located on the reverse extension line of the exit optical axis, and the distance L between the projection point and the center point satisfies the effective focal length EFL of the optical lens: L / EFL≤2.0.

[0011] The embodiment of the present application can ensure the integrity of the optical path by making a reasonable selection of the position of the rotation point as described above, so that when the first reflector rotates to different positions, it can ensure that the light is reliably reflected to the rear lens group, reducing or avoiding the light loss caused by anti-shake, and ensuring that the position difference of the light reaching each lens is small. The present application can ensure that the amount of light reflected by the first reflector into the rear lens group under different anti-shake states (i.e. different positions) will not produce a large difference through the above settings, that is, it can ensure that the image clarity will not produce a large difference under different anti-shake states, ensuring that the optical lens always has a good imaging quality.

[0012] In a possible implementation, the first reflector is configured to perform pitch axis anti-shake and yaw axis anti-shake, and the rotation point is the intersection of the pitch axis and the yaw axis.

[0013] In a possible implementation, the rear lens group is configured to move as a whole along the output optical axis to achieve autofocus.

[0014] In a possible implementation, the rear lens group includes a first lens group and a second lens group, and the first lens group or the second lens group is configured to move along the exit optical axis to achieve autofocus.

[0015] The present application changes the distance between the first lens group and the second lens group, so that the optical lens can achieve long-distance shooting with high image quality, and also has strong close-up shooting ability, realizing wide object distance imaging from long-distance to close-up. The single-group focusing method can simplify the movement mode of the focusing structure of the optical lens, thereby simplifying the focusing method.

[0016] In a possible implementation manner, the focal length of the first lens group is positive, and the focal length of the second lens group is negative.

[0017] Through the above settings, the optical lens can achieve better macro shooting performance.

[0018] In a possible implementation, the first lens group includes at least two lenses, wherein an Abbe number of at least one lens is less than 45, and the second lens group includes at least one lens.

[0019] Through the above settings, the optical lens can obtain better macro shooting performance and balance various aberrations, which is beneficial to improving imaging quality.

[0020] In a possible implementation, the focal length F1 of the front lens group and the overall focal length Fs of the optical lens satisfy: |F1 / Fs|>1.2.

[0021] That is, the absolute value of the ratio of F1 to Fs is greater than 1.2. Through the above arrangement, it can be ensured that the amount of light reflected by the first reflector into the rear lens group in different anti-shake states (i.e., different positions) will not have a large difference, that is, it can be ensured that the image clarity will not have a large difference in different anti-shake states, ensuring that the optical lens 10 always has a good imaging quality.

[0022] In a possible implementation, the optical lens further includes a second reflector located on the image side of the rear lens group, and the second reflector is used to deflect light from the rear lens group.

[0023] This embodiment deflects the propagation angle of light by setting two reflectors, so that the placement direction of the image sensor can be flexibly adjusted to achieve better space utilization. At this time, the light can be deflected, and the plane where the image sensor is located can be parallel to the display screen of the electronic device, so that the setting of the image sensor is no longer limited by the thickness of the electronic device, and a larger image sensor can be set, which is conducive to improving the imaging quality.

[0024] Optionally, the second reflective element may be a reflector or a prism.

[0025] In a possible implementation, the field of view angle of the optical lens is less than 60°.

[0026] The optical lens provided in the present application has a smaller field of view angle to obtain a stronger long-range shooting capability, and the imaging quality in the long-range shooting is high.

[0027] In a possible implementation manner, the image height of the optical lens is greater than 2 mm.

[0028] The optical lens provided in the present application has a larger sensor plate size to obtain a stronger long-range shooting capability, and the imaging quality in the long-range shooting is high.

[0029] In a possible implementation, the focal length of the rear lens group is positive.

[0030] In a possible implementation manner, the first reflective element is a reflector or a prism.

[0031] In a second aspect, a camera module is provided, comprising an anti-shake motor and an optical lens provided by any possible implementation of the first aspect, wherein the anti-shake motor is used to drive the first reflector to achieve optical image stabilization.

[0032] Optionally, the camera module also includes an image sensor located on the image side of the optical lens.

[0033] Optionally, the anti-shake motor may be any one of a voice coil motor, a piezoelectric motor, a shape memory alloy motor, a MEMS motor, a suspended wire motor, and a ball motor.

[0034] In a third aspect, an electronic device is provided, comprising a posture sensor, a processing unit and the camera module provided in the second aspect, wherein the posture sensor is used to collect jitter information of the electronic device and send the jitter information to the processing unit, and the processing unit is used to control the anti-shake motor according to the jitter information.

[0035] Optionally, the posture sensor includes but is not limited to a gyroscope, an accelerometer, an inertial sensor, a Hall sensor, or a magnetic encoder, etc. For example, the posture sensor may be a micro-electromechanical system gyroscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a comparison chart of the camera effects of a camera module without optical image stabilization function and a camera module with optical image stabilization function.

[0037] Figure 2 This is a schematic diagram of the principle of five-axis optical image stabilization.

[0038] Figure 3 It is a schematic diagram of the principles of lens stabilization and image sensor stabilization.

[0039] Figure 4 It is a structural schematic diagram of a camera module in the prior art.

[0040] Figure 5 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0041] Figure 6 It is a structural schematic diagram of the camera module provided in Example 1 of the present application.

[0042] Figure 7 This is a control principle diagram of optical image stabilization of an electronic device provided in an embodiment of the present application.

[0043] Figure 8 Schematic diagram of two different setting positions of the rotation point of the first reflective element.

[0044] Fig. 9 Schematic diagram of the formation method of the rotation point of the first reflector.

[0045] Fig.10 It is a schematic diagram of the optical path when the camera module provided in Example 1 of the present application focuses on a distant view.

[0046] Fig.11 This is a schematic diagram of the optical path when the camera module provided in Example 1 of the present application focuses on a close view.

[0047] Fig.12 yes Fig.10 The figure shows the simulation effect of the optical lens when focusing on a distant scene.

[0048] Fig.13 yes Fig.11 The figure shows the simulation effect of the optical lens when focusing on a close-up.

[0049] Fig.14 It is a structural schematic diagram of the camera module provided in Example 2 of the present application.

[0050] Fig.15 yes Fig.14 The figure shows the simulation effect of the optical lens when focusing on a distant scene.

[0051] Fig.16 It is a structural diagram of the camera module provided in Example 3 of the present application when focusing on a distant view.

[0052] Fig.17 It is a structural schematic diagram of the camera module provided in Example 3 of the present application when focusing on a close-up view.

[0053] Fig.18 yes Fig.16 The figure shows the simulation effect of the optical lens when focusing on a distant scene.

[0054] Fig.19 yes Fig.17 The figure shows the simulation effect of the optical lens when focusing on a close-up.

[0055] Fig. 20 It is a structural schematic diagram of the camera module provided in the fourth embodiment of the present application when focusing on a distant view.

[0056] Fig.21 It is a structural diagram of the camera module provided in the fourth embodiment of the present application when focusing on a close-up view.

[0057] Fig. 22 yes Fig. 20 The figure shows the simulation effect of the optical lens when focusing on a distant scene.

[0058] Fig.23 yes Fig.21 The figure shows the simulation effect of the optical lens when focusing on a close-up.

[0059] Reference numerals:

[0060] 1-lens; 1a-reflective element; 1b-lens; 2-image sensor; 3. infrared filter;

[0061] 10-optical lens; 11-first lens; 12-second lens; 13-third lens; 14-fourth lens; 15-fifth lens; 16-sixth lens; 17-seventh lens; 18-first reflector; 19-aperture stop; 20-image sensor; 21-second reflector; 30-filter; 40-anti-shake motor; 41-drive unit;

[0062] 100-camera module; 200-back cover; 300-display screen; 400-frame; 500-position sensor; 600-processing unit; 1000-electronic equipment;

[0063] G1-first lens group; G2-second lens group; OA-optical axis; OA1-exit optical axis; OA2-incident optical axis; P1-rotation point; P2-center point of reflection surface; P3-projection point; S1-first rotation axis; S2-second rotation axis. DETAILED DESCRIPTION

[0064] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0065] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] In the description of the present application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0067] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to 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 the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0068] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0069] For ease of understanding, the technical terms involved in this application are explained and described below.

[0070] Lens: A component that uses the refraction principle of the lens to allow the light of the scene to pass through the lens and form a clear image on the focusing plane.

[0071] Optical axis (OA): The direction in which light is transmitted by an optical system, with reference 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. For off-axis and reflective systems, the optical axis may also appear as a broken line.

[0072] Object side and image side: 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.

[0073] Aperture: A device used to control the amount of light that passes through the lens and enters the photosensitive surface of the camera body. It is usually inside the lens. The aperture size is expressed in F numbers.

[0074] Aperture F (Fno) value: equal to the focal length of the lens divided by the entrance pupil diameter. If the focal length of the lens remains unchanged, the larger the entrance pupil diameter, the larger the aperture, the smaller the aperture F value, the more light enters, the brighter the picture, and the more blurred the subject and background; on the contrary, the smaller the entrance pupil diameter, the smaller the aperture, the larger the aperture F value, the less light enters, the darker the picture, and the clearer the subject and the front and back are.

[0075] Focal length: Also known as focal length, it is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens or lens group to the focal point when an infinitely distant scene forms a clear image on the focal plane through a lens or lens group. It can also be understood as the vertical distance from the optical center of a lens or lens group to the focal plane. From a practical point of view, it can be understood as the distance from the center of the lens to the imaging plane.

[0076] Effective focal length (EFL): The distance from the principal plane of an optical system to the corresponding focus.

[0077] Focus: Focus is also called light and focusing. The process of changing the distance between the object and the distance between the objects through the camera's focus mechanism to make the image of the object clear is called focusing. Usually, digital cameras have a variety of focusing methods, including automatic focus, manual focus, or multiple focus methods.

[0078] Auto focus (AF): Auto focus uses the principle of light reflection from the object to form an image on the image sensor after the reflected light passes through the lens, and then the object distance of the object is obtained through computer processing, and then the lens is automatically moved according to the object distance to complete the focusing. The function of auto focus is to make objects at different distances appear clear on the image sensor. The camera module usually uses a power structure such as a voice coil motor (VCM) to control the optical lens to move forward and backward along the optical axis to adjust the distance between the lens and the image sensor, thereby achieving auto focus.

[0079] Field of view (FOV): Also known as the field of view. In optical instruments, the angle formed by the two edges of the maximum range of the image of the object that can pass through the lens, with the lens of the optical instrument as the vertex, is called the field of view.

[0080] Refractive index: If light enters a non-absorbing homogeneous material, light reflection and refraction will occur at its interface. The refractive index n is equal to the ratio of the speed of light in a vacuum, c, to the speed of light in the medium, v. In fact, the refractive index is measured by measuring the deflection angle caused by the refraction of the light beam at the interface. The formula describing the deflection is called Snell's law.

[0081] Aperture stop (STO) is a diaphragm that limits the maximum inclination angle of the marginal light in the imaging beam of an on-axis point, that is, the diaphragm with the smallest incident aperture angle. Here, the aperture refers to the edge, frame or specially set perforated barrier of the optical element in the optical assembly used to limit the imaging beam size or imaging space unit.

[0082] Dispersion: The property of a material's refractive index changing with the frequency of the incident light is called "dispersion". For example, after sunlight passes through a prism, a continuous spectrum of colors arranged in sequence from red to purple is produced. In a broad sense, dispersion not only refers to the decomposition of light waves into a spectrum, but also any physical quantity that changes with frequency (or wavelength) is called dispersion. In the embodiment of the present application, after the complex light enters the lens, since the lens has different refractive indices for light of different frequencies, the propagation directions of various colored lights are deflected to different degrees, and thus they are dispersed when leaving the lens, which is called "dispersion".

[0083] Dispersion coefficient: It is an important indicator to measure the imaging quality of a lens, usually expressed as the Abbe number, so the dispersion coefficient is also called the Abbe number. The larger the dispersion coefficient (Abbe number), the less obvious the dispersion, and the better the imaging quality of the lens; the smaller the dispersion coefficient (Abbe number), the more obvious the dispersion, and the worse the imaging quality of the lens.

[0084] Aberration: The paraxial region of an optical system has the properties of an ideal optical system. The paraxial light emitted from a point on the object intersects the image plane at one point (also known as the paraxial image point). However, the light rays that actually pass through different apertures of the lens are unlikely to intersect perfectly at one point, but have a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0085] Axial chromatic aberration (longitudinal spherical aberration): also known as longitudinal chromatic aberration or position chromatic aberration or axial aberration, a beam of light parallel to the optical axis converges at different positions before and after passing through the lens. This aberration is called position chromatic aberration or axial chromatic aberration. This is because the positions of the images of the light of each wavelength are different, so that the focal planes of the image side of the light of different colors cannot overlap when the final image is formed, and the complex light spreads out to form dispersion.

[0086] Distortion: Also called distortion, it is the degree of distortion of the image formed by the optical system relative to the object itself. Distortion is due to the influence of aperture spherical aberration. The height of the intersection of the main light of different fields of view with the Gaussian image plane after passing through the optical system is not equal to the ideal image height. The difference between the two is the distortion. Therefore, distortion only changes the imaging position of the off-axis object point on the ideal plane, causing the shape of the image to be distorted, but does not affect the clarity of the image.

[0087] Image height (ImgH): It refers to half of the diagonal length of the effective pixel area on the photosensitive chip, that is, the image height of the imaging surface.

[0088] Astigmatism: Since the object point is not on the optical axis of the optical system, the light beam it emits has an inclination angle with the optical axis. After the light beam is refracted by the lens, the convergence point of its meridional beamlet and sagittal beamlet is not at the same point. That is, the light beam cannot be focused on one point, and the image is not clear, so astigmatism occurs. Meridian beamlet and sagittal beamlet are the names of light beams in two perpendicular planes in a rotationally symmetric optical system.

[0089] Field curvature: Field curvature is used to indicate the difference between the clearest image point position of the non-central field of view light after passing through the optical lens group and the clearest image point position of the central field of view on the optical axis. When the lens has field curvature, the intersection point of the entire light beam does not coincide with the ideal image point. Although a clear image point can be obtained at each specific point, the entire image plane is a curved surface.

[0090] With the advancement of science and technology and economic development, people have higher and higher requirements for the camera function of portable electronic devices. They not only require the camera module equipped with electronic devices to achieve background blur and clear night shooting, but also require electronic devices to have optical image stabilization (OIS) function to improve the quality of photos and enhance the user's photo experience.

[0091] When users use the camera module of an electronic device to take photos or videos, the images taken are easily blurred due to hand shaking, shaking of the photographed object, or limitations of the optical environment of the photo. Optical image stabilization technology can solve this problem well. Optical image stabilization refers to the use of optical components, such as lens settings, in imaging instruments such as cameras to avoid or reduce instrument jitter in the process of capturing optical signals in order to improve image quality. A common practice is to use a gyroscope for jitter detection, and then use a driving mechanism such as a voice coil motor to translate or rotate the lens or image sensor in the opposite direction to compensate for image blur caused by the shaking of the imaging instrument during exposure.

[0092] Figure 1 This is a comparison chart of the camera effects of the camera module without optical image stabilization and with optical image stabilization. Figure 1 Part (a) is the camera effect diagram of the camera module without optical image stabilization function. Figure 1 Part (b) is a picture of the camera effect of the camera module with optical image stabilization function.

[0093] like Figure 1 As shown in part (a) of the figure, at time t0, the light is refracted by lens 1 and then directed to image sensor 2. At this time, the human hand and the object being photographed are both stationary, so the image obtained is very ideal. At time t1, due to the shaking of the user's hand, the entire camera module tilts and shakes, causing the light that should have been incident on imaging point S1 in the figure to deviate and instead incident on imaging point S2, making the image obtained very blurry, affecting the user experience.

[0094] like Figure 1 As shown in part (b) of the figure, when an electronic device has an optical image stabilization function, when the gyroscope equipped in the electronic device detects that the device is shaking, the anti-shake motor can translate or rotate the lens 1 in the opposite direction to compensate for the shaking, that is, to compensate for the image blur caused by the shaking during exposure. At this time, the lens 1 is moved by the anti-shake motor, which can ensure that the light that should be incident on the imaging point S1 in the figure will not be deviated and incident on other positions, thereby ensuring the quality of the photo and improving the user's photo experience.

[0095] Figure 2 This is a schematic diagram of the principle of five-axis optical image stabilization. Figure 2 As shown, in order to perform shake compensation as much as possible to ensure the shooting quality, after the shake of the electronic device is detected by sensors such as a gyroscope, it is necessary to perform X-axis translation, Y-axis translation, rotation (Roll), deflection (Yaw) and pitch (Pitch) on the lens (Lens) or image sensor (Sensor) in the camera, a total of 5-axis anti-motion compensation, so that the lens and image sensor remain still in the electronic device when taking pictures, thereby realizing the anti-shake function when taking pictures.

[0096] In actual applications, due to physical limitations, multiple actuators are usually required to achieve all 5-axis anti-motion compensation. For example, lens OIS is for pitch and yaw axis stabilization, and sensor OIS is for X, Y and roll axis stabilization.

[0097] Optical image stabilization can be divided into two types: lens image stabilization (Lens OIS) that performs image stabilization by moving the lens, and sensor image stabilization (Sensor OIS) that performs image stabilization by moving the image sensor. Figure 3 This is a schematic diagram of the principle of lens anti-shake and image sensor anti-shake. Figure 3 Part (a) is a schematic diagram of the principle of the camera module with image sensor anti-shake. Figure 3 Part (b) is a schematic diagram of the principle of lens stabilization.

[0098] like Figure 3 As shown in part (a) of the figure, the image sensor stabilization realizes optical stabilization by moving the image sensor 2, which can realize X / Y / Roll axis stabilization. However, this solution requires the electrical signal of the image sensor 2 to be moved, which is technically difficult and will also increase the size of the module. Figure 3 As shown in part (b) of FIG. 1 , the lens stabilization realizes optical stabilization by moving the lens 1, which is simple to realize and does not require any electrical signal movement. The lens stabilization can usually realize two-axis stabilization of the yaw axis and the pitch axis.

[0099] The embodiments of the present application mainly relate to technical improvements to the lens anti-shake solution. Figure 4 The camera module shown in the figure is used as an example to further introduce the lens anti-shake. Figure 4As shown, the camera module includes a prism 1a, an imaging lens group composed of multiple lenses 1b, a filter 3, and an image sensor 2, which are sequentially arranged along the optical axis OA. The light from the object side is incident on the prism 1 along the Y direction (i.e., the thickness direction of the mobile phone), deflected 90° by the reflection surface of the prism 1, and is imaged on the image sensor 2 after sequentially passing through the convergence effect of the imaging lens group and the filtering effect of the filter 3 along the Z axis direction (i.e., the length direction of the mobile phone).

[0100] The camera module also includes an anti-shake motor (not shown in the figure), which is used to drive the prism 1a to perform shake compensation to improve the shooting quality. Figure 4 As shown, the anti-shake motor can drive the prism 1a to rotate around the Y-axis in the figure, that is, drive the right-angle prism 1a to shake its head to achieve anti-shake on the deflection axis. In addition, the anti-shake motor can also drive the prism 1a to rotate around the X-axis perpendicular to the paper in the figure, that is, drive the prism 1a to nod (raise its head) to achieve anti-shake on the pitch axis. In some cases, the anti-shake motor can drive the prism 1a to rotate around the deflection axis and the pitch axis at the same time to achieve a better optical anti-shake effect. At this time, driven by the anti-shake motor, the right-angle prism 1a will rotate around the intersection of the deflection axis and the pitch axis, and the intersection of the deflection axis and the pitch axis is the rotation point of the prism 1a.

[0101] exist Figure 4 In the optical lens shown, in order to facilitate the anti-shake design, the prism 1a is usually set on the object side (outer side) edge of the optical path, and the multiple lenses 1b used for imaging are all set on the image side (inner side) of the prism 1a. Since the number of lenses 1b is large and they need to be arranged at intervals to achieve autofocus, the optical lens has a larger size in the Z-axis direction, that is, the optical lens is relatively long, which is disadvantageous to the internal structural design of the electronic device.

[0102] In view of the above problems, the embodiment of the present application provides an optical lens, which can reduce the size of the optical lens in the Z-axis direction while achieving normal optical image stabilization by optimizing the lens structure, that is, it can reduce the length of the optical lens, which brings convenience to the internal structural design of the electronic device. Since the optical lens provided by the embodiment of the present application has a small size in the Z-axis direction, the arrangement space of other components inside the electronic device can be expanded, the internal structure of the electronic device is effectively optimized, the difficulty of the internal structural design and layout of the electronic device is reduced, and it is conducive to the miniaturization and lightweight design of the electronic device, which can improve the user experience.

[0103] The following first introduces the electronic device with the above-mentioned optical lens in conjunction with the accompanying drawings. The electronic device can be, for example, a mobile phone, a tablet computer, a laptop computer, a television, a vehicle-mounted device, a wearable device, a camera, a camera, a video surveillance device, and other electronic products with photo or video functions. The mobile phone can be, for example, a conventional straight-plate mobile phone, or a foldable mobile phone, for example, a small folding mobile phone up and down, a left and right inward folding mobile phone, or a left and right outward folding mobile phone. Wearable devices can be, for example, smart bracelets, smart watches, wireless headphones, augmented reality (AR) glasses, AR helmets, virtual reality (VR) glasses, or VR helmets. The embodiment of the present application is described by taking the electronic device as a mobile phone as an example.

[0104] Figure 5 is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application, wherein: Figure 5 Part (a) and part (b) in FIG. 1 are respectively a front view and a back view of the electronic device 1000. Figure 5 As shown, the electronic device 1000 includes a camera module 100, a back cover 200, a display screen 300, a frame 400, and an image processor (not shown in the figure) located inside the device. The back cover 200 and the display screen 300 are fixed to the two sides of the frame 400 in reverse, and the back cover 200, the display screen 300 and the frame 400 together surround the entire inner cavity of the electronic device 1000. Among them, the display screen 300 can be used to display images, and can also integrate touch functions to achieve human-computer interaction. The camera module 100 is accommodated in the inner cavity of the whole machine, and the camera group 100 is used to collect optical information outside the electronic device 1000 and form a corresponding image signal. The image processor is connected to the camera module 100 in communication, and the image processor is used to obtain image signals from the camera module 100 and process image signals. Among them, the communication connection between the camera module 100 and the image processor can include data transmission through electrical connection methods such as wiring, and data transmission can also be achieved through coupling and other methods. It is understandable that the camera module 100 and the image processor can also achieve communication connection through other methods that can realize data transmission.

[0105] In the embodiment of the present application, the back cover 200 may be provided with a camera hole, and the camera module 100 collects light through the camera hole, and the camera module 100 may be used as a rear camera of the electronic device 1000. Exemplarily, the back cover 200 may include a light-transmitting lens, which is installed in the camera hole to allow light to pass through and is dustproof and waterproof. The light-transmitting lens may also be regarded as a part of the camera module 100 in some cases.

[0106] In other embodiments, the camera module 100 may also be used as a front camera of the electronic device 1000. For example, the display screen 300 may be provided with a light-transmitting area, and the camera module 100 may collect optical information outside the electronic device 1000 through the light-transmitting area. In other words, the camera module 100 may be used as a front camera module of the electronic device 1000, or as a rear camera module of the electronic device 1000, and the embodiments of the present application do not strictly limit this.

[0107] like Figure 5 As shown in part (b) of the figure, the camera module 100 can be installed in the middle part of the upper part of the electronic device 1000. In other implementations, the camera module 100 can also be set at the left end or the right end of the upper part, and the present application does not strictly limit the installation position of the camera module 100.

[0108] Optionally, the electronic device 1000 may further include an analog-to-digital converter (also referred to as an A / D converter, not shown in the figure). The analog-to-digital converter is connected between the camera module 100 and the image processor 20. The analog-to-digital converter is used to convert the analog image signal generated by the camera module 10 into a digital image signal and transmit it to the image processor 20, and then the image processor 20 processes the digital image signal to obtain a processed image signal, and the processed image signal can be displayed as an image or video on a display screen.

[0109] Optionally, the electronic device 1000 may further include a memory (not shown in the figure), the memory is communicatively connected to the image processor, and the image processor transmits the processed image signal to the memory, so that when the image needs to be viewed later, the processed image signal can be searched from the memory at any time and displayed on the display screen. In some embodiments, the image processor also compresses the processed image signal and stores it in the memory to save memory space.

[0110] Optionally, the camera module 100 may include one, two, three, four or more lenses. For example, the camera module 100 may include two lenses, one of which is a main camera lens and the other is a telephoto lens. For another example, the camera module 100 may also include three lenses, the first of which is a main camera lens, the second is a telephoto lens, and the last one is a secondary camera lens, an ultra-wide-angle lens, a macro lens or a depth of field lens. For another example, the camera module 100 may also include four lenses, one of which is a main camera lens, the second is a telephoto lens, the third is an ultra-wide-angle lens, and the last one is a macro lens.

[0111] Figure 6 is a structural diagram of the camera module 100 provided in the first embodiment of the present application, such as Figure 6As shown, the camera module 100 in the embodiment of the present application includes an optical lens 10 and an image sensor 20.

[0112] Among them, the image sensor 20 is located on the image side of the optical lens 10. The camera module 100 may also include a circuit board (not shown in the figure), and the image sensor 20 may be arranged on the circuit board. Light can pass through the optical lens 10 to illuminate the image sensor 20. Exemplarily, the working principle of the camera module 100 is: the light reflected by the photographed scene generates an optical image through the optical lens 10 and is projected onto the image sensor 20, and the image sensor 20 converts the optical image into an electrical signal, that is, an analog image signal and transmits it to the analog-to-digital converter, so as to be converted into a digital image signal through the analog-to-digital converter to the image processor.

[0113] Among them, the image sensor 20 (also called a photosensitive element) is a semiconductor chip, the surface of which contains hundreds of thousands to millions of photodiodes, which will generate electric charge when exposed to light. The image sensor 20 can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). A charge coupled device is made of a highly sensitive semiconductor material that can convert light into electric charge. A charge coupled device is composed of many photosensitive units, usually in units of millions of pixels. When the surface of the charge coupled device is exposed to light, each photosensitive unit will reflect the charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. Complementary metal oxide semiconductors are mainly semiconductors made of two elements, silicon and germanium, so that N-pole and P-pole semiconductors coexist on the complementary metal oxide semiconductor. The current generated by these two complementary effects can be recorded and interpreted into an image by the processing chip.

[0114] In some embodiments, the image sensor 20 can be moved to perform shake compensation, thereby achieving optical image stabilization. For example, the image sensor 20 can be translated in a plane perpendicular to the Z axis or rotated relative to the Z axis to achieve the aforementioned Figure 2 In this case, the image sensor 20 does not have the ability to move on the Z axis, or has a weak stroke that is much smaller than the focus stroke, so as to reduce the thickness of the module. In other embodiments, the image sensor 20 may also be a fixed component and cannot perform shake compensation.

[0115] Among them, the optical lens 10 mainly uses the refraction principle of the lens to form an image, that is, the light of the scene passes through the optical lens 10, forms a clear image on the imaging surface, and the image of the scene is recorded by the image sensor 20 located on the imaging surface. Exemplarily, the optical lens 10 can be a telephoto lens, such as a periscope telephoto lens. When the optical lens 10 focuses on an object with an object distance greater than 100 meters, that is, when it focuses on a distant view or infinity, the field of view FOV of the optical lens 10 is less than 60°, for example, the field of view FOV can be 30°, 35°, 45°, 50°, 54° or 58°, etc., but not limited thereto. In addition, the image height ImgH of the optical lens 10 is greater than 2 mm, that is, the diagonal size of the image sensor of the optical lens 10 (such as the image sensor 20) is greater than 4 mm, for example: the diagonal size of the image sensor of the optical lens 10 can be 5 mm, 6 mm or 8 mm, etc. In the present application, the optical lens 10 has a smaller field of view angle and a larger sensor panel size, so as to have a stronger long-range shooting capability and a high imaging quality in the long-range shooting.

[0116] like Figure 6 As shown, the camera module 100 in the embodiment of the present application also includes a filter 30. The filter 30 can be located between the optical lens 10 and the image sensor 20, and is used to filter out unnecessary bands in the light to prevent the image sensor 20 from generating false colors or ripples, so as to improve its effective resolution and color reproduction. Exemplarily, the filter 30 can be an infrared filter, such as an infrared cut-off filter (IRCF). Among them, the filter 30 in this embodiment is an independent component located between the optical lens 10 and the image sensor 20. In other embodiments, the filter 30 can be set at any position before the image sensor 20, or the filter 30 can be cancelled. Instead, at least one optical element of the optical lens 10 is subjected to surface treatment or material treatment to achieve filtering. This application does not strictly limit the specific embodiments of the structural member or structure used to achieve filtering.

[0117] Optionally, the infrared filter may be realized by evaporating an infrared (IR) material coating on a blue crystal substrate.

[0118] Optionally, the infrared filter may be a white glass filter or a blue glass filter.

[0119] The structural details of the optical lens 10 are described below in conjunction with the accompanying drawings. Figure 6As shown, in this embodiment, the optical lens 10 includes a front lens group, a first reflector 18, and a rear lens group arranged in sequence from the object side to the image side, and the first reflector 18 is used to reflect light from the front lens group to the rear lens group. The front lens group is a fixed lens group, and the first reflector 18 is rotatably configured in the lens to achieve optical image stabilization.

[0120] The optical lens 10 provided in the embodiment of the present application is provided with a front lens group on the object side of the first reflector 18, and the front lens group includes at least one lens, that is, some lenses of the optical lens 10 can be provided on the object side of the first reflector 18, rather than all lenses provided on the image side of the first reflector 18, so that since the number of lenses provided on the image side of the optical lens 10 is reduced, the size of the optical lens 10 in the Z-axis direction can be reduced, that is, the length of the optical lens 10 can be reduced. In addition, the arrangement space of other components inside the electronic device 1000 is expanded, the internal structure of the electronic device is effectively optimized, the difficulty of the internal structural design and layout of the electronic device is reduced, and it is conducive to the miniaturization and thinness design of the electronic device, which can improve the user experience.

[0121] The first reflector 18 is used to reflect the light from the front lens group to the rear lens group, so that the optical lens 10 can achieve a periscope structural layout. The first reflector 18 is rotatably configured in the lens, and can be rotated under the drive of the anti-shake motor, thereby achieving optical image stabilization and improving the shooting quality of the optical lens 10. Since the front lens group is a fixed lens group, the anti-shake motor only needs to drive the first reflector 18 when performing optical image stabilization, and does not need to drive the front lens group and the rear lens group. The moving parts of the optical image stabilization can be simplified, so that the workload of the anti-shake motor is small, the design requirements for the motor are reduced, and the design of the anti-shake motor and the camera module becomes easier. Since the lens does not participate in jitter compensation, the number of movable lenses can be reduced, so that more lenses can be fixedly set on the optical path, and the relative positions of more lenses become fixed, which can reduce the influence of tolerance on the imaging point and improve the imaging stability, so that the optical lens 10 provided in the embodiment of the present application has good imaging quality and high imaging clarity.

[0122] The optical lens 10 provided in the embodiment of the present application optimizes the lens structure and can reduce the size of the optical lens 10 in the Z-axis direction while achieving normal optical image stabilization, that is, it can reduce the length of the optical lens, bringing convenience to the internal structural design of the electronic device. The optical lens 10 can also facilitate the design of the image stabilization motor and the camera module, and has better imaging quality.

[0123] Figure 7 1 is a control principle diagram of optical image stabilization performed by the electronic device 1000 provided in the embodiment of the present application. Figure 7 As shown, the electronic device 1000 also includes a posture sensor 500 and a processing unit 600. The posture sensor 500 is used to collect the jitter information of the electronic device 1000 and send the jitter information to the processing unit 600, and the processing unit 600 is used to control the anti-shake motor 40 of the camera module 100 according to the jitter information, so that the anti-shake motor 40 can drive the first reflector 18 to rotate to achieve optical image stabilization.

[0124] Furthermore, the processing unit 600 can control the anti-shake motor 40 through the driving unit 41 of the anti-shake motor 40. The processing unit 600 can be, for example, an anti-shake chip, or any processor or controller for performing anti-shake calculations. The driving unit 41 can be, for example, a driving circuit or a driving chip. At this time, the processing unit 600 can calculate the jitter compensation information (for example, the displacement of the reverse movement) of the first reflector 18 according to the jitter information, and send the jitter compensation information to the driving unit 41. The driving unit 41 controls the anti-shake motor 40 according to the jitter compensation information, for example, controls the size and / or direction of the driving current of the anti-shake motor 40, so that the anti-shake motor 40 drives the first reflector 18 to perform jitter compensation.

[0125] Optionally, the posture sensor 500 includes but is not limited to a gyroscope, an accelerometer, an inertial sensor, a Hall sensor, or a magnetic encoder, etc. For example, the posture sensor 500 may be a micro electromechanical system (MEMS) gyroscope.

[0126] Optionally, the anti-shake motor 40 may be any one of a voice coil motor, a piezo motor, a shape memory alloy (SMA) motor, a MEMS motor, a suspension wire motor, and a ball motor.

[0127] For example, the anti-shake motor 40 may be a voice coil motor. In this case, the anti-shake motor 40 may include three parts: a fixed part, a movable part, and an actuator. The fixed part has a receiving space for receiving the movable part; the movable part is movably arranged on the fixed part for fixing and installing the first reflector 18; the actuator is used to drive the movable part to rotate, that is, drive the first reflector 18 to rotate, so as to perform shake compensation.

[0128] The actuator usually includes a combination of a coil and a magnet. The coil and the magnet can be fixed on the fixed part and the movable part respectively. The two can be arranged in parallel. By connecting direct current to the coil, a driving force can be provided to the magnet. By changing the magnitude and direction of the direct current of the coil, the magnitude and direction of the force on the magnet covered by the magnetic field can be controlled. The magnet can provide the driving force to the movable part to drive the movable part to rotate. The movable part further drives the first reflector 18 to rotate, thereby achieving the function of jitter compensation.

[0129] Optionally, in order to achieve closed-loop control, the anti-shake motor 40 may also include a position detection sensor, which is used to detect the real-time position information of the moving part and send the real-time position information to the drive unit 41. The drive unit 41 controls the coil according to the real-time position information, such as increasing or decreasing the current of the coil, and changing the current direction.

[0130] Optionally, the position detection sensor may be a Hall sensor or a magnetoresistive (MR) sensor.

[0131] like Figure 6 As shown, the first reflector 18 is configured to rotate around the rotation point P1, that is, under the drive of the anti-shake motor 40, the first reflector 18 can rotate around the rotation point P1 as the center point. The rotation point P1 can be located inside the first reflector 18 or outside the first reflector 18. The rotation point P1 can be located on the optical axis or adjacent to the optical axis. For example, the projection distance of the rotation point P1 on the optical axis is 0 to 3 mm, such as 0.5 mm, 1.2 mm, 1.8 mm or 2.5 mm.

[0132] like Figure 6 As shown, in this embodiment, the first reflector 18 is a mirror, and the optical axis can be divided into an incident optical axis OA2 and an outgoing optical axis OA1 with the center point P2 of the reflective surface of the first reflector 18 as the boundary, that is, the optical axis on the object side of the center point P2 of the reflective surface of the first reflector 18 is the incident optical axis OA2, and the optical axis on the image side of the center point P2 of the reflective surface of the first reflector 18 is the outgoing optical axis OA1. The rotation point P1 can be located on the incident optical axis OA2 or the outgoing optical axis OA1, or it can be adjacent to the incident optical axis OA2 or the outgoing optical axis OA1. For example, the projection distance of the rotation point P1 on the incident optical axis OA2 or the outgoing optical axis OA1 is 0 to 3 mm, such as 0.6 mm, 1.5 mm, 2.0 mm or 2.4 mm. In some cases, the rotation point P1 can also coincide with the center point P2.

[0133] like Figure 6As shown, in this embodiment, the rotation point P1 is located on the emergent optical axis OA1, that is, the rotation point P1 is located on the image side of the center point P2.

[0134] Figure 8 Schematic diagram of two different settings of the rotation point P1 of the first reflector 18. Figure 8 As shown in part (a) of FIG. 1 , the projection point P3 of the rotation point P1 on the line where the outgoing optical axis OA1 is located is located on the outgoing optical axis OA1. The line where the outgoing optical axis OA1 is located is a line parallel to the Z axis. The projection point (e.g., the positive projection point) of the rotation point P1 is located on the outgoing optical axis OA1, which means that the rotation point P1 is located on the image side of the center point P2. As a possible implementation, Figure 6 As shown, the rotation point P1 is located on the output optical axis OA1. At this time, the projection point of the rotation point P1 on the straight line where the output optical axis OA1 is located is itself, that is, at this time, the rotation point P1 and the projection point P3 are the same point, and the projection point P3 is the rotation point P1.

[0135] like Figure 8 As shown in part (b) of the figure, the projection point P3 of the rotation point P1 on the straight line where the outgoing optical axis OA1 is located is located on the reverse extension line of the outgoing optical axis OA1, and the straight line where the outgoing optical axis OA1 is located is a straight line parallel to the Z axis. The projection point (for example, the positive projection point) of the rotation point P1 is located on the reverse extension line of the outgoing optical axis OA1, which means that the rotation point P1 is located on the back side of the center point P2, wherein the back side of the center point P2 and the image side are the two sides opposite to or away from the center point P2, for example, the back side is Figure 8 The left side of the center point P2, and the image side is Figure 8 As a possible implementation, the rotation point P1 is located on the reverse extension line of the outgoing optical axis OA1. At this time, the projection point of the rotation point P1 on the straight line where the outgoing optical axis OA1 is located is itself, that is, at this time, the rotation point P1 and the projection point P3 are the same point, and the projection point P3 is the rotation point P1. Further, on this basis, the distance L between the projection point P3 and the center point P2 and the effective focal length EFL of the optical lens 10 satisfy: L / EFL≤2.0.

[0136] The embodiment of the present application can ensure the integrity of the optical path by making a reasonable selection of the position of the rotation point P1, so that when the first reflector 18 rotates to different positions, it can ensure that the light is reliably reflected to the rear lens group, reduce or avoid light loss caused by anti-shake, and ensure that the position difference of the light reaching each lens is small. The present application can ensure that the amount of light reflected into the rear lens group by the first reflector 18 in different anti-shake states (i.e. different positions) will not produce a large difference through the above setting, that is, it can ensure that the image clarity will not produce a large difference in different anti-shake states, and ensure that the optical lens 10 always has a good imaging quality.

[0137] Fig. 9 Schematic diagram of the formation method of the rotation point P1 of the first reflector 18. Fig. 9 As shown, the first reflector 18 can be configured to rotate around multiple rotation axes (for example, two, three or four, etc.), and the intersection of the multiple rotation axes constitutes the rotation point P1 in the embodiment of the present application. Fig. 9 The first axis S1 in the Fig. 9 The second rotation axis S2 in the first rotation axis rotates, and the intersection of the first rotation axis S1 and the second rotation axis S2 is the rotation point P1.

[0138] Further, in this embodiment, the first rotation axis S1 may be a yaw axis parallel to the Y axis, and the first reflector 18 may be configured to perform yaw axis anti-shake, that is, the first reflector 18 performs a head shaking motion around the first rotation axis S1 under the drive of the anti-shake motor 40. The second rotation axis S2 may be a pitch axis parallel to the X axis, and the first reflector 18 may be configured to perform a pitch axis anti-shake, that is, the first reflector 18 performs a nodding motion or a head raising motion around the second rotation axis S2 under the drive of the anti-shake motor 40. At this time, the rotation point P1 is the intersection of the pitch axis and the yaw axis.

[0139] The structural details of the optical lens 10 provided in the embodiment of the present application will be further introduced below in conjunction with the accompanying drawings.

[0140] like Figure 6 As shown, the front lens group is located on the object side of the first reflector 18 for receiving external light. The front lens group includes at least one lens, for example, the first lens 11. In addition, according to specific imaging requirements, the front lens group may also include two, three or more lenses.

[0141] like Figure 6As shown, the first reflector 18 is located between the front lens group and the rear lens group, and is used to reflect (deflect) the light from the front lens group to the rear lens group. Since the first reflector 18 can change the propagation direction of the light, the optical axis direction of the optical lens 10 can be different from the direction in which the external light enters the electronic device 1000, so that the optical lens 10 can achieve a periscope structural layout, thereby making the arrangement position and angle of the optical lens 10 more flexible.

[0142] In this embodiment, the first reflective element 18 is a reflector. In other embodiments, the first reflective element 18 may also be a prism, such as a right-angle prism.

[0143] Optionally, the reflective surface of the first reflective element 18 may be a metal reflective film layer prepared by evaporation or sputtering, and the metal may be nickel, aluminum, silver, gold, etc. or alloys thereof.

[0144] Optionally, a high-reflection film layer design may be adopted, and a high-reflection film layer may be provided on the reflective surface to improve the imaging quality.

[0145] Optionally, considering the cutoff ability of the optical system for near-infrared and ultraviolet light, the film layer of the reflective surface can be designed to have the characteristics of high reflection of visible light (380nm~780nm) and high transmission of ultraviolet band (below 380nm) and near-infrared band (above 780nm), thereby reducing the non-visible light entering the image sensor 20 and improving the imaging quality.

[0146] Optionally, the reflectivity of the reflective surface may be required to be above 95% within the visible light bandwidth, with no reflectivity constraints for ultraviolet and near infrared.

[0147] Optionally, the reflective surface of the first reflector 18 can be a plane with good processability. In addition, the reflective surface of the first reflector 18 can also be a spherical surface (concave or convex), a cylindrical surface (curvature in one direction and straight extension in the other direction) or a free-form surface. In this case, the reflective surface of the first reflector 18 can also correct astigmatism and aberration when realizing light reflection, so as to further improve image quality or reduce volume.

[0148] The rear lens group is located on the image side of the first reflector 18, and is used to converge the light reflected from the first reflector 18 and image it on the image sensor 20. The rear lens group includes multiple lenses to improve the specifications of the optical lens and improve the imaging quality. Exemplarily, the rear lens group can include two to eight lenses, such as two, four, five or six.

[0149] In this embodiment, the focal length of the rear lens group is positive. The rear lens group has a large number of lenses, and the focal length of the rear lens group is set to be positive so that the rear lens group plays a core imaging role.

[0150] Optionally, the focal length of the front lens group can be positive or negative.

[0151] Optionally, the focal length F1 of the front lens group and the overall focal length Fs of the optical lens 10 satisfy: |F1 / Fs|>1.2. That is, the absolute value of the ratio of F1 to Fs is greater than 1.2. Through the above arrangement, it can be ensured that the amount of light reflected by the first reflector 18 into the rear lens group in different anti-shake states (i.e., different positions) will not produce a large difference, that is, it can be ensured that the image clarity will not produce a large difference in different anti-shake states, and the optical lens 10 can always have a better imaging quality.

[0152] like Figure 6 As shown, in this embodiment, the rear lens group includes a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 arranged in sequence from the object side to the image side.

[0153] Optionally, the optical lens 10 may include three to ten lenses, such as four, seven or eight lenses. According to actual optical design requirements, at least one of the above-mentioned multiple lenses may be arranged on the object side of the first reflector 18 to form a front lens group, and the remaining lenses may be arranged on the image side of the first reflector 18 to form a rear lens group.

[0154] Optionally, the multiple lenses of the optical lens 10 can be made of the same material, such as glass, resin, etc. Among them, glass has high refractive index and low expansion characteristics, so that the optical lens 10 has better imaging quality and low temperature drift characteristics. The resin has a low density, which can reduce the weight of the lens group, facilitate movement, and improve the focusing ability of the optical lens 10. In other embodiments, at least one of the multiple lenses of the optical lens 10 is made of a different material from the other lenses, and this application is not limited to this.

[0155] Optionally, the multiple lenses of the optical lens 10 can be formed by processes such as injection molding, molding and / or polishing and grinding.

[0156] Optionally, the optical surface of at least one lens of the optical lens 10 is an aspherical surface, and the optical surface of the aspherical shape has different optical powers from the paraxial to the outer field of view area, so that the image has a more balanced image quality. And / or, the optical surface of at least one lens of the optical lens 10 can be a free-form surface to correct aberrations. Among them, the aspherical surface is a surface that is rotationally symmetrical around the optical axis; the free-form surface can have no symmetry axis, or can be symmetrical along a certain direction, or can be symmetrical along two directions.

[0157] Optionally, the multiple lenses of the optical lens 10 are assembled through an active alignment (AA) process to ensure assembly accuracy.

[0158] Optionally, a diffraction grating structure may be formed on the optical surface of at least one lens of the optical lens 10. By properly setting the diffraction grating structure, chromatic aberration can be reduced, and the volume of the optical lens 10 can also be reduced.

[0159] Optionally, the optical lens 10 may further include a liquid lens (not shown in the figure) to enhance the focusing effect and achieve ultra-close-up photography. The liquid lens is a structural component that uses liquid as a lens and changes the focal length by changing the curvature of the liquid.

[0160] Optionally, at least one lens of the optical lens 10 can adopt a special-shaped technology to reduce the size of the optical lens 10, so that the optical lens 10 can be better suitable for miniaturized electronic devices 1000, and the scope of application of the optical lens 10 is increased. The incision can be realized by the I-CUT process. In addition, since the height of the lens is reduced by the incision, the lens can be set with a larger light-through aperture, thereby increasing the light throughput of the optical lens 10, so that the imaging quality of the optical lens 10 is better. Among them, the special-shaped technology can also be used on the structural support members of the lens such as the lens barrel and the spacer to reduce the size of the optical lens 10.

[0161] Optionally, the peripheral side surface or supporting surface of at least one lens of the optical lens 10 can be blackened or roughened to eliminate stray light and improve the image quality. The blackening treatment can be coated or plated with a matte material such as black ink, or can be a film. The roughening treatment is mainly used to increase the roughness.

[0162] like Figure 6 As shown, the rear lens group includes a first lens group G1 and a second lens group G2 arranged in sequence from the object side to the image side, wherein the first lens group G1 includes at least one lens, for example, may include two, three, four or more lenses, and the second lens group G2 includes at least one lens, for example, may include two, three, four or more lenses. In this embodiment, the first lens group G1 includes a second lens 12, a third lens 13 and a fourth lens 14, and the second lens group G2 includes a fifth lens 15, a sixth lens 16 and a seventh lens 17.

[0163] Optionally, the focal length of the first lens group G1 is positive, and the focal length of the second lens group G2 is negative. Through the above arrangement, the optical lens 10 can obtain better macro shooting performance.

[0164] Optionally, the first lens group G1 includes at least two lenses (i.e., two lenses), wherein at least one lens has an Abbe number less than 45, and the second lens group G2 includes at least one lens. Through the above arrangement, the optical lens 10 can obtain better macro shooting performance, and can balance various aberrations, which is beneficial to improving imaging quality.

[0165] like Figure 6 As shown, during the focusing process of the optical lens 10 switching from a distant view to a near view, the distance between the first lens group G1 and the second lens group G2 increases. Conversely, during the focusing process of the optical lens 10 switching from a near view to a distant view, the distance between the first lens group G1 and the second lens group G2 decreases. Therefore, during the focusing process of the optical lens 10 switching between a distant view and a near view, the distance between the first lens group G1 and the second lens group G2 changes.

[0166] In the present application, by changing the distance between the first lens group G1 and the second lens group G2, the optical lens 10 can achieve long-distance shooting with high imaging quality, and also have strong close-up shooting capabilities to achieve wide object distance imaging from long-distance to close-up.

[0167] In the embodiment of the present application, the first lens group G1 is a focusing lens group, the second lens group G2 is a fixed position lens group, and the first lens group G1 can move on the optical axis (for example, the emission optical axis OA1) to achieve the above-mentioned focusing process. This embodiment adopts a single-group focusing method, which can simplify the movement method of the focusing structure of the optical lens 10, thereby simplifying the focusing method.

[0168] Fig.10 It is a schematic diagram of the optical path when the camera module 100 provided in the first embodiment of the present application focuses on a distant view. Fig.11 This is a schematic diagram of the optical path when the camera module provided in Example 1 of the present application focuses on a close view.

[0169] like Fig.10 As shown, when the optical lens 10 focuses on the distant view (infinity), the first lens group G1 moves along the optical axis toward the image side, and the light reflected by the distant view object passes through the optical lens 10 and is imaged on the imaging surface of the image sensor 20, so that the camera module 100 can capture distant view images. Fig.11 As shown, when the optical lens 10 focuses on the near view, the first lens group G1 moves along the optical axis toward the object side, and the light reflected by the near view object passes through the optical lens 10 and is imaged on the imaging surface of the image sensor 20, so that the camera module 10 can capture near view images.

[0170] like Fig.10 and Fig.11 As shown, in the focusing process of the optical lens 10 switching from a distant view to a near view, the first lens group G1 moves along the optical axis toward the object side, the second lens group G2 does not move, the distance between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the optical lens 10 decreases. In addition, the distance between the first lens group G1 and the image sensor 20 increases, and the distance between the second lens group G2 and the image sensor 20 remains unchanged.

[0171] This embodiment focuses by moving the first lens group G1 and fixing the second lens group G2, so that when focusing on a close-up, the object side of the optical lens 10 is closer to the subject, the degree of light deflection is small, the aberration is reduced, and the imaging quality is improved.

[0172] Optionally, the first lens group G1 may be driven to move on the optical axis by a focus motor, thereby achieving the aforementioned focusing process. The focus motor may be, for example, a voice coil motor, a piezoelectric motor, a shape memory alloy motor, or a stepping motor.

[0173] like Figure 6 , Fig.10 as well as Fig.11 As shown, the optical lens 10 may further include an aperture stop 19, and the aperture stop 19 may be installed in the first lens group G1. In this case, the aperture adjustment effect of the aperture stop 19 is better, and the imaging quality of the optical lens 10 can be improved. For example, the aperture stop 19 may be installed at one end of the first lens group G1 close to the object side. In addition, the aperture stop 19 may also be installed in other lenses of the first lens group G1, the second lens group G2, the front lens group, or other positions of the optical lens 10, and the embodiments of the present application are not strictly limited to this.

[0174] The aperture diaphragm 19 may be a spacer ring structure or a variable fan blade structure; or, the aperture diaphragm 19 may be realized by a surface spraying process, for example, by spraying a light-shielding material on a lens to form the aperture diaphragm 19. The position of the aperture diaphragm 19 may be fixed or variable. For example, the position of the aperture diaphragm 19 is variable, and the aperture diaphragm 19 may be adjusted according to the focusing condition to be located between different lenses.

[0175] The following combines data and simulation results to present Figure 6 The illustrated embodiment of the optical lens 10 in a possible embodiment.

[0176] Please refer to Table 1a and Table 1b, where Table 1a is Figure 6 The curvature radius, thickness, refractive index (Nd) and Abbe number of each lens, first reflector 18, aperture stop 19 and filter 30 of the optical lens 10 shown in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. Table 1b is Figure 6 The aspheric coefficients of the lenses of the optical lens 10 in a possible embodiment are shown.

[0177] Table 1a:

[0178]

[0179]

[0180] Table 1b:

[0181] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 -3.39E-04 -2.67E-06 -1.55E-07 1.04E-08 -3.91E-10 5.38E-12 S2 -3.49E-04 -4.64E-06 1.15E-07 -4.44E-09 5.87E-11 S8 -5.48E-04 2.15E-05 -5.83E-06 3.24E-07 -5.05E-09 -3.26E-10 S9 -4.23E-03 1.30E-03 -2.87E-04 3.17E-05 -1.74E-06 3.79E-08 S10 5.07E-03 8.38E-05 -1.97E-04 2.80E-05 -1.67E-06 3.81E-08 S11 9.40E-03 -1.36E-03 1.16E-04 -1.30E-05 1.13E-06 -4.33E-08 S12 3.93E-03 2.28E-04 3.81E-05 -1.63E-05 2.29E-06 -9.31E-08 S13 1.98E-03 4.40E-04 -6.33E-05 5.63E-06 3.05E-08 -1.18E-08 S14 -1.13E-02 7.97E-04 2.59E-05 -1.15E-05 8.88E-07 -2.16E-08 S15 -9.05E-03 -1.63E-04 2.26E-04 -3.68E-05 2.43E-06 -5.43E-08 S16 8.49E-03 -8.98E-04 6.78E-05 7.65E-06 -1.68E-06 1.13E-07 -2.85E-09 S17 7.97E-03 -9.02E-04 7.98E-05 2.27E-06 -9.28E-07 6.52E-08 -1.58E-09 S18 1.56E-02 -4.66E-03 5.63E-04 -2.52E-05 -9.88E-07 1.53E-07 -5.91E-09 7.79E-11 S19 1.94E-02 -4.77E-03 6.03E-04 -4.05E-05 1.37E-06 -1.47E-08 -2.97E-10 6.49E-12

[0182] The aspheric surface of the telephoto lens 10 in Table 1a can be defined by, but not limited to, the following aspheric surface curve equation:

[0183]

[0184] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 1b.

[0185] Table 1c:

[0186] parameter F Fno FOV F1 F1 / Fs Numeric 18.7 2.0 26° 82.0 4.385

[0187] Table 1c shows other parameter information of the optical lens 10, such as the overall focal length Fs, aperture value Fno, field of view FOV, focal length F1 of the front lens group (i.e., the first lens 11), and the ratio of F1 to Fs, etc. Among them, F1 / Fs is 4.385 (greater than the aforementioned set threshold value 1.2), which can ensure that the amount of light reflected by the first reflector 18 into the rear lens group under different anti-shake states (i.e., different positions) will not produce a large difference, that is, it can ensure that the image clarity will not produce a large difference under different anti-shake states, and ensure that the optical lens 10 always has a better image quality.

[0188] In this embodiment, when the optical lens 10 switches from a distant view to a near view, for example, switches to focus on a near view of 60 mm, the first lens group G1 moves toward the object side, and the distance between the first lens group G1 and the second lens group G2 increases by 2.2 mm, that is, the focusing stroke of the first lens group G1 moving toward the object side is 2.2 mm. Compared with conventional lenses (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing ability is strong.

[0189] Please refer to Fig.12 and Fig.13 , Fig.12 yes Fig.10 The simulation effect diagram of the optical lens 10 when focusing on the distant view is shown in FIG. Fig.13 yes Fig.11 The simulation effect diagram of the optical lens 10 when focusing on a close-up of 60 mm is shown.

[0190] in, Fig.12 and Fig.13They all include axial chromatic aberration curves, astigmatism field curvature diagrams, and distortion diagrams of the optical lens 10. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (including 650nm, 610nm, 555nm, 510nm, and 470nm in the figure); their physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; their abscissa is the deviation value along the optical axis, and their ordinate is the normalized coordinate (height) at the pupil. Fig.12 and Fig.13 The values ​​shown in the middle are all small. When focusing on the distant view and the near view, the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.12 and Fig.13 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the light beam (actual image height) in different fields of view and the ideal image height. Fig.12 and Fig.13 The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0191] Fig.14 1 is a schematic diagram of the structure of the camera module 100 provided in the second embodiment of the present application. Fig.14 As shown, in this embodiment, the rear lens group of the optical lens 10 is configured to move as a whole along the output optical axis OA1 to achieve autofocus. For example, the rear lens group includes six lenses, namely, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, and a seventh lens 17, which are arranged in sequence from the object side to the image side. The positions of these six lenses are relatively fixed, and the focus motor can simultaneously drive these six lenses to move as a whole toward the object side or toward the image side on the output optical axis OA1 to achieve autofocus.

[0192] Furthermore, in the present embodiment, the optical lens 10 further includes a second reflector 21 located on the image side of the rear lens group, and the second reflector 21 is used to reflect or deflect the light from the rear lens group to the image sensor 20 .

[0193] In this embodiment, two reflectors are provided to deflect the propagation angle of the light, so that the placement direction of the image sensor 20 can be flexibly adjusted to achieve better space utilization. At this time, the light can be deflected 180 degrees, and the plane where the image sensor 20 is located can be parallel to the display screen 300 of the electronic device 1000, so that the setting of the image sensor 20 is no longer limited by the thickness of the electronic device 1000, and a larger image sensor can be provided, which is conducive to improving the imaging quality.

[0194] Optionally, the second reflector 21 may be a reflector or a prism.

[0195] The following combines data and simulation results to present Fig.14 The illustrated embodiment of the optical lens 10 in a possible embodiment.

[0196] Please refer to Table 2a and Table 2b, where Table 2a is Fig.14 The curvature radius, thickness, refractive index (Nd) and Abbe number of each lens, first reflector 18, aperture stop 19 and filter 30 of the optical lens 10 shown in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface used to facilitate optical design. Table 2b is Fig.14 The aspheric coefficients of the lenses of the optical lens 10 in a possible embodiment are shown.

[0197] Table 2a:

[0198]

[0199]

[0200] Table 2b:

[0201] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 -8.06E-04 4.52E-06 -1.67E-06 7.60E-08 -1.74E-09 1.31E-12 S2 -7.74E-04 -2.92E-06 -5.03E-07 2.20E-08 -5.72E-10 S8 9.93E-05 -6.02E-05 1.18E-05 -2.92E-07 -1.27E-07 1.14E-08 S9 -2.53E-05 -3.12E-04 7.36E-05 -9.60E-06 8.09E-07 -2.44E-08 S10 6.24E-03 -1.95E-03 3.48E-04 -3.17E-05 1.34E-06 -1.75E-08 S11 7.86E-03 -2.57E-03 4.72E-04 -3.60E-05 6.41E-07 3.17E-08 S12 4.54E-03 -7.27E-04 1.18E-04 2.54E-05 -4.78E-06 1.94E-07 S13 3.63E-03 -1.35E-03 4.35E-04 -5.69E-05 3.65E-06 -1.06E-07 S14 -3.47E-02 1.93E-03 6.52E-04 -1.98E-04 2.08E-05 -7.49E-07 S15 -2.65E-02 -1.23E-03 1.15E-03 -2.01E-04 1.14E-05 7.39E-08 S16 2.21E-02 -3.37E-03 -6.93E-04 7.54E-04 -1.95E-04 2.33E-05 -1.11E-06 S17 1.11E-02 3.60E-03 -3.51E-03 1.31E-03 -2.47E-04 2.33E-05 -8.79E-07 S18 -4.38E-03 1.46E-02 -8.05E-03 2.48E-03 -4.65E-04 5.19E-05 -3.12E-06 7.70E-08 S19 1.37E+00 8.56E-02 1.04E-01 2.36E-02 9.55E-03 8.10E-03 2.20E-03 1.22E-03

[0202] The aspheric surface of the telephoto lens 10 in Table 2a can be defined by, but not limited to, the following aspheric surface curve equation:

[0203]

[0204] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 2b.

[0205] Table 2c:

[0206] parameter F Fno FOV F1 F1 / Fs Numeric 18.7 2.0 26° 43.0 2.299

[0207] Table 2c shows other parameter information of the optical lens 10, such as the overall focal length Fs, aperture value Fno, field of view FOV, focal length F1 of the front lens group (i.e., the first lens 11), and the ratio of F1 to Fs, etc. Among them, F1 / Fs is 2.299 (greater than the aforementioned set threshold value 1.2), which can ensure that the amount of light reflected by the first reflector 18 into the rear lens group under different anti-shake states (i.e., different positions) will not produce a large difference, that is, it can ensure that the image clarity will not produce a large difference under different anti-shake states, and ensure that the optical lens 10 always has a better image quality.

[0208] Please refer to Fig.15 , Fig.15 yes Fig.14 The simulation effect diagram of the optical lens 10 when focusing on a distant view is shown.

[0209] in, Fig.15 It includes an axial chromatic aberration curve diagram, an astigmatism field curvature diagram, and a distortion diagram of the optical lens 10. The axial chromatic aberration curve diagram includes spherical aberration curves corresponding to different wavelength bands of the system (including 650nm, 610nm, 555nm, 510nm, and 470nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its abscissa is the deviation value along the optical axis direction, and its ordinate is the normalized coordinate (height) at the pupil. Fig.15 The values ​​shown in the middle are all small. When focusing on the distant view, the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.15 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the light beam (actual image height) in different fields of view and the ideal image height. Fig.15 The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0210] Fig.16 It is a structural diagram of the camera module 100 provided in the third embodiment of the present application when focusing on a distant view. Fig.17 1 is a schematic diagram of the structure of the camera module 100 provided in the third embodiment of the present application when focusing on a close-up scene. Compared with the aforementioned first embodiment, the second lens group G2 is moved in this embodiment to perform automatic focusing.

[0211] In the embodiment of the present application, the first lens group G1 is a fixed position lens group, the second lens group G2 is a focusing lens group, and the second lens group G2 can move on the optical axis (for example, the exit optical axis OA1) to achieve the focusing process. This embodiment adopts a single-group focusing method, which can simplify the movement method of the focusing structure of the optical lens 10, thereby simplifying the focusing method.

[0212] like Fig.16 As shown, when the optical lens 10 focuses on the distant view, the light reflected by the distant view object passes through the optical lens 10 and is imaged on the imaging surface of the image sensor 20, and the camera module 100 can capture the distant view image. Fig.17 As shown, when the optical lens 10 focuses on the near view, the second lens group G2 moves along the optical axis toward the image side, and the light reflected by the near view object passes through the optical lens 10 and is imaged on the imaging surface of the image sensor 20, so that the camera module 10 can capture near view images.

[0213] like Fig.16 and Fig.17 As shown, in the focusing process of the optical lens 10 switching from a distant view to a near view, the first lens group G1 does not move, the second lens group G2 moves along the optical axis toward the image side, the distance between the first lens group G1 and the second lens group G2 increases, and the effective focal length EFL of the optical lens 10 decreases. In addition, the distance between the first lens group G1 and the image sensor 20 remains unchanged, and the distance between the second lens group G2 and the image sensor 20 decreases.

[0214] The following combines data and simulation results to present Fig.16 The illustrated embodiment of the optical lens 10 in a possible embodiment.

[0215] Please refer to Table 3a and Table 3b together. Table 3a is Fig.16 The curvature radius, thickness, refractive index (Nd) and Abbe number of each lens, first reflector 18, aperture stop 19 and filter 30 of the optical lens 10 shown in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface used to facilitate optical design. Table 3b is Fig.16 The aspheric coefficients of the lenses of the optical lens 10 in a possible embodiment are shown.

[0216] Table 3a:

[0217]

[0218]

[0219] Table 3b:

[0220] Face number A4 A6 A8 A10 A12 A14 A16 A18 S1 -3.37E-04 -2.40E-06 -1.71E-07 9.17E-09 -1.88E-10 -3.04E-13 S2 -3.54E-04 -2.35E-06 -1.80E-07 1.06E-08 -2.24E-10 S8 -4.68E-04 -3.20E-06 -1.67E-06 -7.21E-09 9.55E-10 -9.32E-11 S9 -2.79E-03 4.92E-04 -8.71E-05 7.64E-06 -3.41E-07 6.73E-09 S10 5.99E-03 -5.94E-04 -8.56E-06 4.57E-06 -3.24E-07 8.42E-09 S11 8.73E-03 -1.23E-03 8.98E-05 -5.31E-06 1.69E-07 -5.68E-09 S12 4.22E-03 1.92E-04 -1.72E-05 6.65E-06 -8.06E-07 4.11E-08 S13 2.38E-03 1.07E-04 7.92E-06 6.05E-07 -1.55E-07 1.15E-08 S14 -1.20E-02 1.31E-03 -1.37E-04 9.72E-06 -3.95E-07 6.31E-09 S15 -1.06E-02 9.91E-04 -1.07E-04 8.87E-06 -4.82E-07 1.08E-08 S16 5.61E-03 -2.88E-06 -1.68E-05 5.25E-06 -1.39E-07 -2.37E-08 9.77E-10 S17 4.23E-03 1.87E-05 -2.05E-05 5.42E-06 -4.85E-07 2.07E-08 -4.87E-10 S18 -1.63E-03 7.41E-04 -1.40E-04 1.70E-05 -1.34E-06 6.43E-08 -1.75E-09 2.12E-11 S19 -8.84E-04 7.31E-04 -1.18E-04 1.27E-05 -8.80E-07 3.79E-08 -9.25E-10 9.85E-12

[0221] The aspheric surface of the telephoto lens 10 in Table 3a can be defined by, but not limited to, the following aspheric surface curve equation:

[0222]

[0223] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 3b.

[0224] Table 3c:

[0225] parameter F Fno FOV F1 F1 / Fs Numeric 18.7 2.2 26° 157.0 8.396

[0226] Table 3c shows other parameter information of the optical lens 10, such as the overall focal length Fs, aperture value Fno, field of view FOV, focal length F1 of the front lens group (i.e., the first lens 11), and the ratio of F1 to Fs, etc. Among them, F1 / Fs is 8.396 (greater than the aforementioned set threshold value 1.2), which can ensure that the amount of light reflected by the first reflector 18 into the rear lens group under different anti-shake states (i.e., different positions) will not produce a large difference, that is, it can ensure that the image clarity will not produce a large difference under different anti-shake states, and ensure that the optical lens 10 always has a better image quality.

[0227] In this embodiment, when the optical lens 10 switches from the telephoto to the near-field at 60 mm, the second lens group G2 moves toward the image side, and the distance between the first lens group G1 and the second lens group G2 increases by 2.2 mm. Correspondingly, the distance between the second lens group G2 and the filter 30 decreases by 2.2 mm to keep the height of the optical lens 10 unchanged.

[0228] Please refer to Fig.18 and Fig.19 , Fig.18 yes Fig.16 The simulation effect diagram of the optical lens 10 when focusing on the distant view is shown in FIG. Fig.19 yes Fig.17 The simulation effect diagram of the optical lens 10 when focusing on a close-up of 60 mm is shown.

[0229] in, Fig.18 and Fig.19They all include axial chromatic aberration curves, astigmatism field curvature diagrams, and distortion diagrams of the optical lens 10. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (including 650nm, 610nm, 555nm, 510nm, and 470nm in the figure); their physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; their abscissa is the deviation value along the optical axis, and their ordinate is the normalized coordinate (height) at the pupil. Fig.18 and Fig.19 The values ​​shown in the middle are all small. When focusing on the distant view and the near view, the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig.18 and Fig.19 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the light beam (actual image height) in different fields of view and the ideal image height. Fig.18 and Fig.19 The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0230] Fig. 20 It is a structural diagram of the camera module 100 provided in the fourth embodiment of the present application when focusing on a distant view. Fig.21 1 is a schematic diagram of the structure of the camera module 100 provided in the fourth embodiment of the present application when focusing on a close view. Compared with the above-mentioned embodiment, in this embodiment, the first reflector 18 is a prism.

[0231] The following combines data and simulation results to present Fig. 20 The illustrated embodiment of the optical lens 10 in a possible embodiment.

[0232] Please refer to Table 4a and Table 4b. Table 4a is Fig. 20 The curvature radius, thickness, refractive index (Nd) and Abbe number of each lens, first reflector 18, aperture stop 19 and filter 30 of the optical lens 10 shown in a possible embodiment when focusing on a distant view. The thickness includes the thickness of the lens itself and the distance between the lenses. The virtual surface is an imaginary surface used to facilitate optical design. Table 4b is Fig. 20 The aspheric coefficients of the lenses of the optical lens 10 in a possible embodiment are shown.

[0233] Table 4a:

[0234]

[0235] Table 4b:

[0236]

[0237]

[0238] The aspheric surface of the telephoto lens 10 in Table 4a can be defined by, but not limited to, the following aspheric surface curve equation:

[0239]

[0240] Where z is the relative distance between a point on the aspherical surface and the intersection point on the optical axis; r is the vertical distance between the point on the aspherical curve and the optical axis; c is the curvature; k is the cone coefficient; α i is the i-th order aspheric coefficient, see Table 4b.

[0241] Table 4c:

[0242] parameter F Fno FOV F1 F1 / Fs Numeric 18.7 2.1 26° 108.0 5.775

[0243] Table 4c shows other parameter information of the optical lens 10, such as the overall focal length Fs, aperture value Fno, field of view FOV, focal length F1 of the front lens group (i.e., the first lens 11), and the ratio of F1 to Fs, etc. Among them, F1 / Fs is 5.775 (greater than the aforementioned set threshold value 1.2), which can ensure that the amount of light reflected by the first reflector 18 into the rear lens group under different anti-shake states (i.e., different positions) will not produce a large difference, that is, it can ensure that the image clarity will not produce a large difference under different anti-shake states, and ensure that the optical lens 10 always has a better image quality.

[0244] In this embodiment, when the optical lens 10 switches from a distant view to a near view, for example, switches to focus on a near view of 60 mm, the first lens group G1 moves toward the object side, and the distance between the first lens group G1 and the second lens group G2 increases by 2.2 mm, that is, the focusing stroke of the first lens group G1 moving toward the object side is 2.2 mm. Compared with conventional lenses (usually requiring more than 4 mm), the focusing stroke is significantly shortened, and the focusing ability is strong.

[0245] Please refer to Fig. 22 and Fig.23 , Fig. 22 yes Fig. 20 The simulation effect diagram of the optical lens 10 when focusing on the distant view is shown in FIG. Fig.23 yes Fig.21 The simulation effect diagram of the optical lens 10 when focusing on a close-up of 60 mm is shown.

[0246] in, Fig. 22 and Fig.23They all include axial chromatic aberration curves, astigmatism field curvature diagrams, and distortion diagrams of the optical lens 10. The axial chromatic aberration curves include spherical aberration curves corresponding to different wavelengths of the system (including 650nm, 610nm, 555nm, 510nm, and 470nm in the figure); their physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; their abscissa is the deviation value along the optical axis, and their ordinate is the normalized coordinate (height) at the pupil. Fig. 22 and Fig.23 The values ​​shown in the middle are all small. When focusing on the distant view and the near view, the on-axis aberration (spherical aberration, chromatic aberration, etc.) of the optical lens 10 is well corrected. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of the fine light beams in different fields of view from the ideal imaging surface. X is the sagittal direction light beam, Y is the meridian direction light beam, the horizontal axis is the deviation value along the optical axis, and the vertical axis is the corresponding field of view. When a field of view value is too large, the image quality of the field of view is poor or there are high-level aberrations. Fig. 22 and Fig.23 The field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation between the convergence point of the light beam (actual image height) in different fields of view and the ideal image height. Fig. 22 and Fig.23 The distortion shown is small, ensuring that there is no noticeable distortion in the image.

[0247] 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, It is characterized in that include: A front lens group, a first reflector (18), and a rear lens group arranged in sequence from the object side to the image side, wherein the first reflector (18) is used to reflect light from the front lens group to the rear lens group; The front lens group is a fixed lens group, and the first reflector (18) is rotatably arranged in the lens to achieve optical image stabilization.

2. The optical lens according to claim 1, It is characterized in that The optical lens has an exit optical axis (OA1) located on the image side of a center point (P2) of the first reflector (18), and the first reflector (18) is configured to rotate around a rotation point (P1); The projection point (P3) of the rotation point (P1) on the straight line where the output optical axis (OA1) is located is located on the output optical axis (OA1); or, The projection point (P3) of the rotation point (P1) on the straight line where the output optical axis (OA1) is located is located on the reverse extension line of the output optical axis (OA1), and the distance L between the projection point (P3) and the center point (P2) and the effective focal length EFL of the optical lens satisfy: L / EFL≤2.

0.

3. The optical lens according to claim 2, It is characterized in that The first reflector (18) is configured to perform pitch axis anti-shake and yaw axis anti-shake, and the rotation point (P1) is the intersection of the pitch axis and the yaw axis.

4. The optical lens according to claim 2 or 3, It is characterized in that The rear lens group is configured to move as a whole along the output optical axis (OA1) to achieve autofocus.

5. The optical lens according to claim 2 or 3, It is characterized in that The rear lens group includes a first lens group (G1) and a second lens group (G2), and the first lens group (G1) or the second lens group (G2) is configured to move along the output optical axis (OA1) to achieve autofocus.

6. The optical lens according to claim 5, It is characterized in that The focal length of the first lens group (G1) is positive, and the focal length of the second lens group (G2) is negative.

7. The optical lens according to claim 5 or 6, It is characterized in that The first lens group (G1) includes at least two lenses, wherein at least one lens has an Abbe number less than 45, and the second lens group (G2) includes at least one lens.

8. The optical lens according to any one of claims 1 to 7, It is characterized in that The focal length F1 of the front lens group and the overall focal length Fs of the optical lens satisfy: |F1 / Fs|>1.

2.

9. The optical lens according to any one of claims 1 to 8, It is characterized in that The optical lens further comprises a second reflector (21) located on the image side of the rear lens group, and the second reflector (21) is used to deflect light from the rear lens group.

10. The optical lens according to any one of claims 1 to 9, It is characterized in that The field of view angle of the optical lens is less than 60°.

11. The optical lens according to any one of claims 1 to 10, It is characterized in that The image height of the optical lens is greater than 2 mm.

12. The optical lens according to any one of claims 1 to 11, It is characterized in that The focal length of the rear lens group is positive.

13. The optical lens according to any one of claims 1 to 12, It is characterized in that The first reflecting element (18) is a reflecting mirror or a prism.

14. A camera module, It is characterized in that It comprises an anti-shake motor and an optical lens as claimed in any one of claims 1 to 13, wherein the anti-shake motor is used to drive the first reflector (18) to achieve optical image shaking.

15. An electronic device, It is characterized in that It includes a posture sensor, a processing unit and a camera module as described in claim 14, wherein the posture sensor is used to collect jitter information of the electronic device and send the jitter information to the processing unit, and the processing unit is used to control the anti-shake motor according to the jitter information.

Images