Optical lens, camera module, and electronic device

Abstract

The present application relates to the technical field of optical lenses, provides an optical lens, an camera module, and an electronic device, and solves the problem of a large size of the camera module in the related art. The optical lens comprises a first lens group, a second lens group, a third lens group, and an optical path folding element. The first lens group has a first optical axis. The optical path folding element comprises an incident region and an exit region. The second lens group is arranged between the first lens group and the incident region along the first optical axis. The incident region is configured to receive light rays passing through the first lens group and the second lens group. The third lens group has a second optical axis. The third lens group and the exit region are arranged along the second optical axis. The optical path folding element is configured to reflect light rays entering the optical path folding element from the incident region a plurality of times and emit the light rays from the exit region to the third lens group. The present application can be used in an electronic device such as a mobile phone.

Description

Optical lenses, camera modules and electronic devices

[0001] This application claims priority to Chinese Patent Application No. 202411826455.9, filed with the State Intellectual Property Office of China on December 11, 2024, entitled "Optical Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference; and Chinese Patent Application No. 202510390378.5, filed with the State Intellectual Property Office of China on March 28, 2025, entitled "Optical Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of optical lens technology, and in particular to an optical lens, camera module and electronic device. Background Technology

[0003] Currently, camera modules have become an indispensable key component in various electronic devices such as mobile phones and tablets. Through camera modules, people can easily capture wonderful moments and meet diverse photography needs such as daily life, work recording, and social sharing.

[0004] The camera module mainly consists of an optical lens and a photosensitive element. Its working principle is as follows: after light is focused by the optical lens, it shines on the photosensitive element. The photosensitive element converts the light signal into an electrical signal, and then the image signal processor performs a series of processing on the electrical signal. Finally, the processed digital image signal is output to the display screen or storage device of the electronic device to form the photos or videos we see.

[0005] With the development of electronic technology, electronic devices are trending towards thinner and lighter designs. This necessitates achieving high imaging performance in camera modules while maintaining a small size to save internal space. Therefore, designing optical lenses for camera modules to reduce their size has become an important issue in the industry. Summary of the Invention

[0006] Embodiments of this application provide an optical lens, a camera module, and an electronic device to solve the problem of large size of camera modules in related technologies.

[0007] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0008] In a first aspect, embodiments of this application provide an optical lens, including a first lens group G1, a second lens group G2, a third lens group G3, and an optical path folding element; the first lens group G1 has a first optical axis, the optical path folding element includes an incident area and an exit area, and the second lens group G2 is disposed between the first lens group G1 and the incident area along the first optical axis, the incident area being used to receive light rays passing through the first lens group G1 and the second lens group G2; the third lens group G3 has a second optical axis, the third lens group G3 and the exit area are arranged along the second optical axis, and the optical path folding element is used to reflect light rays entering the optical path folding element from the incident area multiple times, and direct them from the exit area to the third lens group G3.

[0009] The optical lens in this embodiment incorporates an optical path folding element. This element allows for multiple reflections of light, folding the optical path and shortening the lens's dimensions along the first optical axis, thus facilitating a reduction in the size of the camera module. Furthermore, by placing the optical path folding element between the second lens group G2 and the third lens group G3, the optical path length between them is increased. This optimizes the angle and path of light entering the third lens group G3, which helps correct aberrations and improves the image quality of the optical lens.

[0010] In some embodiments of the first aspect, in the third lens group G3, the total thickness Tm of all lenses at the position of the first straight line and the total thickness Tc at the position of the second optical axis satisfy: Tc / Tm < 1; wherein the first straight line is parallel to the second optical axis and the distance between the first straight line and the second optical axis is kDo, 0.3 ≤ k ≤ 0.4, and Do is the effective area diameter of the third lens group G3. This configuration can better correct the field curvature of the optical lens, thereby improving the imaging quality of the optical lens.

[0011] The third lens group G3 may include one lens or multiple lenses.

[0012] In some embodiments of the first aspect, Tc / Tm ≤ 0.82. This setting allows for better correction of field curvature of the optical lens.

[0013] In some embodiments of the first aspect, k = 0.35. This setting allows for better correction of field curvature in the optical lens.

[0014] In some embodiments of the first aspect, the effective area diameter Do of the third lens group G3 and the image height IMH of the optical lens satisfy: Do / (2˙IMH)≤1.2. This setting allows for smoother imaging rays at the edge of the optical lens's field of view, thereby helping to reduce large field-of-view aberrations.

[0015] In some embodiments of the first aspect, the effective area diameter Do of the third lens group G3 and the effective area diameter D2 of the second lens group G2 satisfy: 0.3 ≤ D2 / Do ≤ 2. This setting can reduce large field-of-view aberrations and improve the imaging effect of a large field of view.

[0016] In some embodiments of the first aspect, the third lens group G3 has negative optical power and includes a single lens. This arrangement simplifies the structure of the optical lens and reduces its size.

[0017] In some embodiments of the first aspect, the effective area diameter DL1 of the lens farthest from the incident area in the first lens group G1 and the effective area diameter DL2 of the lens closest to the incident area in the second lens group G2 satisfy: 1.2 ≤ DL1 / DL2 ≤ 2.5. This setting can reduce large field-of-view aberrations and improve the imaging effect in a large field of view.

[0018] In some embodiments of the first aspect, the first lens group G1 has positive optical power, and the second lens group G2 has negative optical power. This arrangement can partially cancel out aberrations, thereby helping to reduce aberrations in the optical lens.

[0019] In some embodiments of the first aspect, the first lens group G1 is a focusing group and is movable along the first optical axis. This configuration allows the optical lens to achieve a closer focusing distance, thereby improving the macro imaging quality of the optical lens.

[0020] In some embodiments of the first aspect, the first lens group G1 includes four lenses along the object-to-image direction, wherein the first, second, and fourth lenses have positive optical power, and the third lens has negative optical power; the second lens group G2 includes one lens. This arrangement can partially cancel out aberrations, thereby helping to reduce aberrations in the optical lens.

[0021] In some embodiments of the first aspect, the effective focal length F1 of the first lens group G1 and the effective focal length EFL of the optical lens satisfy: 0.3 ≤ F1 / EFL ≤ 0.9. This configuration has the following advantages: first, it simplifies the structure of the first lens group G1 and reduces its volume; second, it improves the macro imaging function of the optical lens and reduces the focusing distance of the first lens group G1; and third, it simplifies the structure and volume of the second lens group G2 and the third lens group G3, thereby contributing to a reduction in the volume of the optical lens.

[0022] In some embodiments of the first aspect, the effective focal length F2 of the second lens group G2 and the effective focal length EFL of the optical lens satisfy: -1.36 ≤ F2 / EFL ≤ -0.78. This setting is beneficial for correcting aberrations in the optical lens, thereby improving the imaging quality of the optical lens.

[0023] In some embodiments of the first aspect, the first lens group G1 and the second lens group G2 constitute an image stabilization lens group, which is movable in a direction perpendicular to the first optical axis. This configuration achieves a better image stabilization effect.

[0024] In some embodiments of the first aspect, the incident area and the exit area are located on the same side of the surface of the optical path folding element, and the protrusion height h2 of the third lens group G3 relative to the exit area is less than the protrusion height h1 of the first lens group G1 relative to the incident area. This arrangement allows the front lens group (i.e., the first lens group G1 and the second lens group G2) and the third lens group G3 to overlap in size along the first optical axis, avoiding the third lens group G3 from additionally increasing the height of the optical lens; at the same time, the third lens group G3 can share the burden of field curvature correction of the front lens group, so the front lens group does not need to set up a complex structure (such as increasing the number of lenses) for field curvature correction, which is beneficial to reducing the height of the front lens group, thereby reducing the height of the optical lens.

[0025] In some embodiments of the first aspect, the optical path folding element is a multi-reflection prism, comprising a first prism surface and a second prism surface arranged along a first direction, and a third prism surface and a fourth prism surface arranged along a second direction Y. The first direction is parallel to the first optical axis, and the second direction is perpendicular to the first optical axis and parallel to the optical axis section of the optical lens. The incident area and the exit area are both located on the first prism surface, which is a total internal reflection surface, or both the first and second prism surfaces are total internal reflection surfaces. The third and fourth prism surfaces are reflective surfaces and are inclined relative to the first direction. This configuration allows for precise control of the light folding path, ensuring that the light propagates along a predetermined path, guaranteeing efficient light transmission, and improving imaging brightness and quality.

[0026] The optical axis section of the optical lens is a section that includes the first optical axis, the second optical axis, and the optical path folding element. In other words, the first optical axis, the second optical axis, and the optical path folding element are all located on the optical axis section of the optical lens.

[0027] In some embodiments of the first aspect, the optical path folding element is a triple-reflection prism. After light enters the optical path folding element from the incident area, it is reflected three times in sequence by the third prism surface, the first prism surface, and the fourth prism surface before exiting from the exit area.

[0028] In some embodiments of the first aspect, the optical path folding element is a five-fold reflection prism. After light enters the optical path folding element from the incident area, it is reflected five times in sequence by the third prism surface, the first prism surface, the second prism surface, the first prism surface, and the fourth prism surface before exiting from the exit area.

[0029] In some embodiments of the first aspect, the angle θ1 between the third prism and the first prism, and the angle θ2 between the fourth prism and the first prism, satisfy: 27°≤θ1=θ2≤34°. This arrangement ensures that the light rays in the optical path folding element meet the condition for total internal reflection, while also preventing an excessively large angle θ1 from causing a large height of the optical path folding element, thus facilitating a reduction in the height of the optical lens.

[0030] In some embodiments of the first aspect, the incident area and the exit area are located on different sides of the optical path folding element, and the projection of the third lens group G3 onto the optical path folding element along the second direction is located in the exit area, wherein the second direction Y is perpendicular to the first optical axis and parallel to the optical axis section of the optical lens. This arrangement allows the front lens group (i.e., the first lens group G1 and the second lens group G2) and the third lens group G3 to overlap in size along the first optical axis, avoiding the third lens group G3 adding extra height to the optical lens. Simultaneously, the third lens group G3 can share the burden of correcting field curvature from the front lens group, eliminating the need for a complex structure for field curvature correction in the front lens group, thus reducing the height of the front lens group and consequently, the height of the optical lens.

[0031] In some embodiments of the first aspect, the field of view (FOV) of the optical lens satisfies: 21° ≤ FOV ≤ 30°. This setting not only allows the optical lens to possess the characteristics of a telephoto lens, but also helps to improve the light uniformity of the optical lens and reduce focusing difficulty.

[0032] In some embodiments of the first aspect, the aperture number Fno of the optical lens satisfies: 2.5 ≤ Fno ≤ 3.4. This setting can reduce the aberrations of the optical lens, which is beneficial to improving the imaging quality at the edges of the image; at the same time, it is also beneficial to increase the amount of light entering the optical lens, thereby improving the imaging quality of the optical lens in low-light environments.

[0033] In some embodiments of the first aspect, the optical lens is a telephoto lens.

[0034] Secondly, embodiments of this application provide a camera module, including a photosensitive element and the optical lens described in the first aspect, wherein the photosensitive element is disposed on the image side of the optical lens.

[0035] The beneficial effects of the camera module in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0036] Thirdly, embodiments of this application provide an electronic device, including a housing and the camera module described in the second aspect, wherein the camera module is mounted on the housing.

[0037] The beneficial effects of the electronic device in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0038] In some embodiments of the third aspect, the electronic device is a mobile phone or a tablet computer. Attached Figure Description

[0039] Figure 1a is a schematic diagram of the definition of the image-side principal plane and the image-side principal point of the optical system;

[0040] Figure 1b is a schematic diagram of the definition of the object-side principal plane and object-side principal point of the optical system;

[0041] Figure 1c is a schematic diagram of the definitions of object distance and image distance in an optical system;

[0042] Figure 2a is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application;

[0043] Figure 2b is a cross-sectional view (AA) of the electronic device in Figure 2a;

[0044] Figure 3 is a schematic diagram of the camera module in the first embodiment of this application;

[0045] Figure 4 is a schematic diagram of the structure of the third lens group in Figure 3;

[0046] Figure 5 is a schematic diagram of the camera module in the second embodiment of this application;

[0047] Figure 6 is a schematic diagram of the camera module in the third embodiment of this application;

[0048] Figure 7 is a schematic diagram of the camera module in the fourth embodiment of this application;

[0049] Figure 8 is a schematic diagram of the camera module in the fifth embodiment of this application;

[0050] Figure 9 is a schematic diagram of the camera module in the sixth embodiment of this application;

[0051] Figure 10 is a schematic diagram of the camera module in the seventh embodiment of this application;

[0052] Figure 11a is a schematic diagram of the camera module in the eighth embodiment of this application;

[0053] Figure 11b is a schematic diagram of the camera module in the ninth embodiment of this application;

[0054] Figure 12a is an optical path diagram of the camera module in the tenth embodiment of this application when the optical lens focuses on a distant scene;

[0055] Figure 12b is an optical path diagram of the camera module in the tenth embodiment of this application when the optical lens focuses on a close-up scene;

[0056] Figure 12c shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the tenth embodiment of this application when focusing on a distant scene (object distance is infinity).

[0057] Figure 12d shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the tenth embodiment of this application when focusing on a close-up scene (object distance of 150mm).

[0058] Figure 12e shows the MTF curve of the optical lens in the tenth embodiment of this application when focusing on a distant scene (object distance is infinity).

[0059] Figure 12f shows the MTF curves of the first lens group and the second lens group in the optical lens of the tenth embodiment of this application during overall motion stabilization.

[0060] Figure 12g shows the MTF curves of the first lens group and the second lens group in the optical lens of the tenth embodiment of this application during overall motion stabilization.

[0061] Figure 13a is an optical path diagram of the camera module in the eleventh embodiment of this application when the optical lens focuses on a distant scene.

[0062] Figure 13b is an optical path diagram of the camera module in the eleventh embodiment of this application when the optical lens focuses on a close-up scene.

[0063] Figure 13c shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the eleventh embodiment of this application when focusing on a distant scene (object distance is infinity).

[0064] Figure 13d shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the eleventh embodiment of this application when focusing on a close-up scene (object distance of 150mm).

[0065] Figure 13e shows the MTF curve of the optical lens in the eleventh embodiment of this application when focusing on a distant scene (object distance is infinity).

[0066] Figure 13f shows the MTF curves of the first lens group and the second lens group in the optical lens of the eleventh embodiment of this application during overall motion stabilization.

[0067] Figure 13g shows the MTF curves of the first lens group and the second lens group in the optical lens of the eleventh embodiment of this application during overall motion stabilization.

[0068] Figure 14a is an optical path diagram of the camera module in the twelfth embodiment of this application when the optical lens focuses on a distant scene;

[0069] Figure 14b is an optical path diagram of the camera module in the twelfth embodiment of this application when the optical lens focuses on a close-up scene;

[0070] Figure 14c shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the twelfth embodiment of this application when focusing on a distant scene (object distance is infinity).

[0071] Figure 14d shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens in the twelfth embodiment of this application when focusing on a close-up scene (object distance of 200mm).

[0072] Figure 14e shows the MTF curve of the optical lens in the twelfth embodiment of this application when focusing on a distant scene (object distance is infinity);

[0073] Figure 14f shows the MTF curves of the first lens group and the second lens group in the optical lens of the twelfth embodiment of this application during overall motion stabilization.

[0074] Figure 14g shows the MTF curves of the first lens group and the second lens group in the optical lens of the twelfth embodiment of this application during overall motion stabilization. Detailed Implementation

[0075] The technical terms used in the embodiments of this application are explained and described below.

[0076] Optical power, expressed as the reciprocal of the image-side focal length (approximately assuming the refractive index of air is 1), characterizes the ability of an optical lens to deflect light. Lenses or lens groups with positive optical power have a positive focal length and converge light rays. Lenses or lens groups with negative optical power have a negative focal length and diverge light rays.

[0077] A positive lens, also known as a converging lens or convex lens, has the function of converging light rays. Convex lenses are classified into biconvex, plano-convex, and concave-convex (or positive meniscus) types.

[0078] A negative lens, also known as a diverging lens or concave lens, has the effect of diverging light. Concave lenses are classified into biconcave, plano-concave, and convex-concave types.

[0079] The optical axis refers to the axis of symmetry of an optical system. For example, the optical axis of an optical lens is the axis that passes through the center of each optical element of the optical lens. The optical axis also refers to the center line of a light beam (light column). The optical properties of the light beam do not change when it rotates around this axis.

[0080] Focal length is a measure of the convergence or divergence of light in an optical system. Focal length is divided into image-side focal length and object-side focal length. Image-side focal length is the distance from the image-side principal plane to the image-side focal point; similarly, object-side focal length is the distance from the object-side principal plane to the object-side focal point. In the embodiments of this application, the focal length, effective focal length (EFL), and combined focal length all refer to image-side focal length.

[0081] The effective focal length, as shown in Figure 1a, refers to the distance from the image-side principal plane to the image-side focal point of an optical system.

[0082] The principal plane of an optical system, also known as the principal plane, includes the image-side principal plane and the object-side principal plane. When parallel light shines on the optical system, it is refracted and passes through the focal point on the image side. After refraction, the light rays are extended backward and intersect the incident light rays at a point. The plane perpendicular to the optical axis through this point is the image-side principal plane, and the point where the image-side principal plane intersects the optical axis of the optical system is the image-side principal point. Similarly, light emitted from the object-side focal point becomes parallel light after refraction. The extended incident light rays intersect the parallel light rays at a point, and the plane perpendicular to the optical axis through this point is the object-side principal plane. The point where the object-side principal plane intersects the optical axis of the optical system is the object-side principal point.

[0083] The position of the principal plane of an optical system can be determined using optical tracing. For example, by tracing a ray parallel to the optical axis in the paraxial region of the optical system, the position of the principal plane and the focal length in the paraxial region can be calculated, as shown in Figure 1a. AB is an incident ray parallel to the optical axis. After passing through the optical system, the outgoing ray E'F' intersects the optical axis at F'. According to the imaging theory of an ideal optical system, F' is the image point of the object point on the infinity axis, called the image-side focal point. Extending the incident ray AB and the outgoing ray E'F' respectively, the two rays must intersect at a point, let this point be Q'. Draw a plane perpendicular to the optical axis through Q' that intersects the optical axis at point H'. Then H' is called the image-side principal point, and the Q'H' plane is called the image-side principal plane. The distance from the image-side principal plane Q'H' to the focal point F' is called the image-side focal length (also called the effective focal length).

[0084] As shown in Figure 1b, F is called the object-side focal point. Let the extension of the incident ray emanating from focal point F intersect the extension of the corresponding outgoing ray parallel to the optical axis at point Q. Draw a plane perpendicular to the optical axis through point Q, intersecting the optical axis at point H. Point H is called the object-side principal point of the optical system, and the QH plane is called the object-side principal plane. The distance from the object-side principal plane QH to the object-side focal point F is called the object-side focal length. The object distance refers to the distance from the object plane to the object-side principal plane of the optical system, as shown in Figure 1c.

[0085] Image distance refers to the distance from the image plane to the principal plane of the image side in an optical system, as shown in Figure 1c.

[0086] The optical system mentioned above can be a single lens (or other optical element), a lens group formed by multiple lenses, or a system formed by multiple lens groups (such as an optical lens).

[0087] Focusing specifically refers to adjusting the position of the lens group (i.e., the focusing lens group) in the optical lens to control the image distance, so that the image plane of the optical lens falls on the photosensitive element, thereby making the image of the optical lens as clear as possible.

[0088] Focusing travel refers to the distance the focusing lens group moves during the focusing process of an optical lens. For example, when an optical lens switches from focusing on a distant scene to focusing on a close-up scene, the distance the focusing lens group moves along the optical axis is the focusing travel.

[0089] The image plane is located on the image side of all lenses in an optical lens, where light rays pass through each lens in sequence to form an image.

[0090] MTF (Modulation Transfer Function) is the ratio of contrast on the image plane to contrast on the object plane; that is, MTF represents the transfer of contrast. MTF = M / m; M = (Imax - Imin) / (Imax + Imin); where Imax is the maximum light intensity on the object plane, and Imin is the minimum light intensity on the object plane; m = (imax - imin) / (imax + imin), where imax is the maximum light intensity on the image plane, and imin is the minimum light intensity on the image plane. MTF is a quantitative description of the sharpness of an optical lens, specifically a quantitative description of the sharpness of the image formed by the optical lens (including both resolution and sharpness). MTF values ​​satisfy 0 ≤ MTF ≤ 1.

[0091] An aperture stop is a physical object in an optical system that limits the beam of light. An aperture stop can be the edge of a lens, a frame, or a specially designed perforated screen. The function of an aperture stop can be twofold: to limit the beam of light or to limit the size of the field of view (imaging range). The aperture stop that limits the beam of light the most in an optical system is called the aperture stop, and the aperture stop that limits the field of view (size) the most is called the field stop.

[0092] The pupil is the image of the aperture stop. The conjugate image of the aperture stop through the optical system in front of the aperture stop is called the entrance pupil, or simply the entrance pupil. The diameter of the entrance pupil is the same as the diameter of the entrance pupil.

[0093] Relative aperture is the ratio of entrance pupil diameter D to image-side focal length fˊ, denoted as RA, i.e., RA = D / fˊ.

[0094] The F-number (Fno or F / #) is the reciprocal of the relative aperture, i.e., F = fˊ / D; the smaller the F-number, the larger the aperture and the shallower the depth of field; conversely, the larger the F-number, the smaller the aperture and the greater the depth of field.

[0095] Total track length (TTL) refers to the total length from the surface of the optical lens closest to the object side to the image plane.

[0096] ImgH (Image Height) represents half the diagonal length of the effective photosensitive area on the image sensor, also known as the image height.

[0097] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0098] Aberration is the deviation between the image formed by an uncorrected optical system and the image formed by an ideal optical system. Aberrations include spherical aberration, coma, field curvature, astigmatism, distortion, and chromatic aberration.

[0099] Spherical aberration is a wide beam aberration. When a concentric beam of light emitted from an on-axis point passes through an optical system, it is no longer concentric. Light rays at different incident heights intersect the optical axis at different positions after passing through the system, resulting in varying degrees of deviation from the paraxial image point (ideal image point). This deviation is called axial spherical aberration, or simply spherical aberration. Due to spherical aberration, the image point on the Gaussian image plane is no longer a point, but a circular spot of confusion. The radius of this spot of confusion is called transverse spherical aberration.

[0100] Coma is an aberration of wide beams at off-axis points. In an optical system with coma, the image point formed by an off-axis object point on the ideal image plane resembles a comet-shaped spot. The narrow beams close to the principal ray intersect the principal ray to form a bright spot, while the image points formed by beams of different apertures far from the principal ray are different rings far from the principal ray. Therefore, this imaging defect is called coma.

[0101] Chromatic aberration (CA) occurs because optical materials have different refractive indices for different wavelengths of light. Therefore, light rays of different colors passing through the same aperture will intersect the optical axis at different points. Similarly, light rays of different colors passing through different apertures will also intersect the optical axis at different points. This results in the image of an object point appearing as a colored diffuse spot at any image plane position. The difference in the imaging position and size between various colors of light is called chromatic aberration. There are two types of chromatic aberration: axial chromatic aberration and transverse chromatic aberration.

[0102] Axial chromatic aberration: The difference in the imaging position of two colors of light at a point on the axis is called positional chromatic aberration, also known as axial chromatic aberration.

[0103] Transverse chromatic aberration: The same medium has different refractive indices for different colors of light; therefore, for an off-axis object point, the transverse magnification of different colors of light is not equal.

[0104] This difference is called vertical color difference, also known as magnification color difference.

[0105] Distortion, also known as distortion, is the difference between the height of the intersection point between the principal ray of different fields of view and the Gaussian image plane after passing through the optical lens and the ideal image height.

[0106] Field curvature is used to describe the difference along the optical axis between the position of the sharpest image point after rays from the off-center field of view pass through the optical lens group and the position of the sharpest image point in the central field of view. When field curvature exists, image points beyond the paraxial region on the Gaussian plane become blurred, and the image of a planar object becomes a curved surface of rotation, and a perfect image of the object plane cannot be obtained at the image plane.

[0107] Astigmatism is the axial distance between the meridional and sagittal image points of a narrow beam of light that do not coincide.

[0108] The meridional plane is the plane formed by the principal ray emitted from an object point outside the principal axis of an optical system and the principal axis of the optical system. Rays lying within the meridional plane are collectively called meridional beams. The point formed by a meridional beam is called a meridional image point. The image plane containing the meridional image point is called the meridional image plane.

[0109] The sagittal plane is a plane passing through the principal ray emitted from an object point located outside the principal axis of the optical system and perpendicular to the meridional plane. Rays lying within the sagittal plane are collectively called sagittal beams. The point formed by the sagittal beam is called the sagittal image point. The image plane containing the sagittal image point is called the sagittal image plane.

[0110] Currently, camera modules have become an indispensable key component in various electronic devices such as mobile phones and tablets. Through camera modules, people can easily capture wonderful moments and meet diverse photography needs such as daily life, work recording, and social sharing.

[0111] The camera module mainly consists of an optical lens and a photosensitive element. Its working principle is as follows: after light is focused by the optical lens, it shines on the photosensitive element. The photosensitive element converts the light signal into an electrical signal, and then the image signal processor performs a series of processing on the electrical signal. Finally, the processed digital image signal is output to the display screen or storage device of the electronic device to form the photos or videos we see.

[0112] With the development of electronic technology, electronic devices are trending towards thinner and lighter designs. This necessitates achieving high imaging performance in camera modules while maintaining a small size to save internal space. Therefore, designing optical lenses for camera modules to reduce their size has become an important issue in the industry.

[0113] One type of camera module optical lens in the related technology includes multiple lens groups arranged along the optical axis. This design results in a large axial dimension of the optical lens (especially the telephoto lens), which is not conducive to reducing the size of the camera module.

[0114] To address this, embodiments of this application provide an optical lens, a camera module, and an electronic device. The optical lens, along the object-side and image-side direction, includes a first lens group, a second lens group, an optical path folding element, and a third lens group. By using the optical path folding element to repeatedly reflect light, the optical path is folded, shortening the axial dimension of the optical lens and thus reducing the size of the camera module. Simultaneously, the thickness of the third lens group at the optical axis is set to be less than the thickness at a certain location in the off-axis region. This helps correct the field curvature of the optical lens and improves its imaging quality.

[0115] The electronic devices in this application embodiment can be mobile phones, tablets, laptops, wearable devices (such as smartwatches), or other electronic devices with camera modules. The following uses a mobile phone as an example to specifically describe the electronic devices in this application embodiment. Other types of electronic devices can be set up with reference to the structure of the mobile phone embodiment, and will not be described in detail here.

[0116] Figure 2a is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application, and Figure 2b is a cross-sectional view of the electronic device in Figure 2a. Figure 2b shows the installation position of the camera module 400 in the electronic device, but its specific installation structure is not shown.

[0117] As shown in Figures 2a and 2b, the electronic device includes a housing 500, a display screen 600, and a camera module 400, both of which are mounted on the housing 500.

[0118] The display screen 620 can be a liquid crystal display screen, an OLED (Organic Light-Emitting Diode) display screen, a QLED (Quantum Dot Light-Emitting Diode) display screen, a Micro LED display screen, an electronic ink display screen, etc., without any specific limitations.

[0119] In some embodiments, as shown in Figures 2a and 2b, the housing 500 includes a mid-frame 510 (also referred to as a front housing or front frame) and a rear cover 520 (also referred to as a battery cover), with the mid-frame 510 connecting the display 600 and the rear cover 520.

[0120] The mid-frame 510 includes a bottom wall 511 and a side wall 512 disposed at the edge of the bottom wall 511. The edge of the display screen 600 is connected to the side wall 512, for example, by bonding. The display screen 600, the bottom wall 511, and the side wall 512 form a first receiving space 530, within which accessories 700 of the display screen 600 are disposed. For example, when the display screen 600 is an LCD display, the accessory 700 may be a backlight; or, when the display screen 600 is an OLED display, the accessory 700 may be a support film, a heat dissipation film, etc.

[0121] The edge of the back cover 520 is connected to the side wall 512 of the middle frame, for example, by snapping. The back cover 520, the bottom wall 511 of the middle frame, and the side wall 512 of the middle frame form a second receiving space 540, which is used to set up the camera module 400.

[0122] Of course, in addition to being installed in the second receiving space 540, the camera module 400 can also be installed in the first receiving space 530 to serve as a front-facing camera module for an electronic device. The mid-frame 510 is not limited to the structure shown in Figure 2b; the mid-frame 510 can also be configured with other structures depending on the actual situation. For example, the mid-frame 510 may not include the bottom wall 511.

[0123] As shown in Figure 2b, the camera module 400 includes an optical lens 100 and a photosensitive element 200. The photosensitive element 200 is located on the image side of the optical lens 100, and the optical lens 100 is positioned opposite to the camera window 521 on the rear cover 520.

[0124] The optical lens 100 is used for focusing and imaging; the photosensitive element 200 (also known as an image sensor) is used to convert light signals into electrical signals. The photosensitive element 200 can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) device, and no specific limitation is made here.

[0125] The working principle of the camera module 400 is as follows: the light of the subject enters the optical lens 100 through the camera window 521, forming a clear image on the focal plane of the optical lens 100, and the image of the subject is recorded by the photosensitive element 200 located at the focal plane. The photosensitive element 200 converts the optical image into an electrical signal and transmits it to the processor of the electronic device. The processor transmits the electrical signal to the display screen 600 to display the image of the subject on the display screen 600.

[0126] In some embodiments, as shown in FIG2b, the camera module 400 further includes a filter 300 located between the optical lens 100 and the photosensitive element 200. The filter 300 is used to filter out unwanted wavelengths in the light, preventing the photosensitive element 200 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, as shown in FIG2b, the filter 300 can be an infrared filter.

[0127] Of course, the filter 300 is not limited to being placed between the optical lens 100 and the photosensitive element 200. The filter 300 can also be attached to the surface of one of the lenses or prisms of the optical lens 100 to achieve filtering.

[0128] Figure 3 is a schematic diagram of the camera module 400 in the first embodiment of this application. As shown in Figure 3, the optical lens 100 includes a first lens group G1, a second lens group G2, a third lens group G3, and an optical path folding element 4.

[0129] The first lens group G1 has a first optical axis 11, and the optical path folding element 4 includes an incident area 41 and an exit area 42. Along the first optical axis 11, the second lens group G2 is disposed between the first lens group G1 and the incident area 41. The incident area 41 is used to receive light passing through the first lens group G1 and the second lens group G2.

[0130] The third lens group G3 has a second optical axis 31. The third lens group G3 and the exit area 42 are arranged along the second optical axis 31. The optical path folding element 4 is used to reflect the light entering the optical path folding element 4 from the incident area 41 multiple times and then shoot it from the exit area 42 to the third lens group G3.

[0131] In this embodiment, the optical lens 100 incorporates an optical path folding element 4. This element folds the light multiple times, folding the optical path of the lens 100 and shortening its size along the Z direction of the first optical axis 11. This facilitates a reduction in the volume of the camera module 400. Furthermore, by placing the optical path folding element 4 between the second lens group G2 and the third lens group G3, the optical path length between them is increased. This optimizes the angle and path of light entering the third lens group G3, which helps correct aberrations in the optical lens 100 and improves its imaging quality.

[0132] In some embodiments, as shown in FIG3, the first lens group G1 has a positive optical power, the second lens group G2 has a negative optical power, and the third lens group G3 has a negative optical power. By setting the optical power of the first lens group G1 to positive, the first lens group G1 focuses the light beam, reducing the diameter of the light beam, which in turn helps to reduce the diameters of the second lens group G2 and the third lens group G3. By setting the optical powers of the first lens group G1, the second lens group G2, and the third lens group G3 in a "positive-negative-negative" combination, some aberrations can be canceled out, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0133] Of course, the optical power of the first lens group G1, the second lens group G2, and the third lens group G3 is not limited to a "positive-negative-negative" combination. It can also be a "positive-positive-negative" combination, that is, the first lens group G1 has positive optical power, the second lens group G2 has positive optical power, and the third lens group G3 has negative optical power.

[0134] The configuration of the first lens group G1 is not unique. In some embodiments, as shown in FIG3, the first lens group G1 may include four lenses. Along the direction from the object side to the image side (i.e., from top to bottom in the figure), the first lens L11, the second lens L12, and the fourth lens L14 have positive optical power, and the third lens L13 has negative optical power. That is, the optical power of the four lenses in the first lens group G1 is arranged in a "positive, positive, negative, positive" combination. This can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0135] Of course, the configuration of the first lens group G1 is not limited to that shown in Figure 3. The first lens group G1 may also include one to three lenses or more than five lenses. The specific number of lenses and the combination of optical power can be determined according to the actual situation.

[0136] The configuration of the second lens group G2 is not unique. In some embodiments, as shown in FIG3, the second lens group G2 includes a lens L21. This configuration helps to reduce the total number of lenses in the optical lens 100, thereby simplifying the structure of the optical lens 100, reducing the size of the optical lens 100, and consequently reducing the size of the camera module 400.

[0137] Of course, the configuration of the second lens group G2 is not limited to that shown in Figure 3. The second lens group G2 may also include two or more lenses. The specific number of lenses and the combination of optical power can be determined according to the actual situation.

[0138] The configuration of the third lens group G3 is not unique. In some embodiments, as shown in FIG3, the third lens group G3 includes a lens L31. This configuration helps to reduce the total number of lenses in the optical lens 100, thereby simplifying the structure of the optical lens 100, reducing the size of the optical lens 100, and consequently reducing the size of the camera module 400.

[0139] Of course, the configuration of the third lens group G3 is not limited to that shown in Figure 3. The third lens group G3 can also include two or more lenses. The specific number of lenses and the combination of optical power can be determined according to the actual situation.

[0140] In some embodiments, as shown in Figures 3 and 4, Figure 4 is a schematic diagram of the structure of the third lens group G3 in Figure 3. In the third lens group G3, the total thickness Tm of all lenses at the position of the first straight line 32 and the total thickness Tc at the position of the second optical axis 31 satisfy the following:

[0141] Tc / Tm < 1, for example, Tc / Tm can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.78, 0.76, 0.81, 0.9, 0.95, 0.96, etc.

[0142] Wherein, the first straight line 32 is parallel to the second optical axis 31 and the distance between the first straight line 32 and the second optical axis 31 is kDo, 0.3≤k≤0.4, for example, k can be 0.3, 0.32, 0.35, 0.38, 0.4, etc., and Do is the effective area diameter of the third lens group G3.

[0143] By setting Tc / Tm to less than 1, that is, the total thickness Tc of the third lens group G3 at the position of the second optical axis 31 is less than the total thickness Tm at the position of the first straight line 32, the third lens group G3 is thicker at the position of the first straight line 32 (corresponding to the edge of the image), which has a stronger ability to refract light. This allows adjustment of the convergence of edge light rays (i.e., light rays passing through the edge area of ​​the third lens group G3), so that the edge light rays and the center light rays (i.e., light rays passing through the center area of ​​the third lens group G3) are focused on the same plane as much as possible. This can better correct the field curvature of the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0144] In addition, by setting k to 0.3≤k≤0.4, the distance range between the first straight line 32 and the second optical axis 31 covers the area in the effective area 33 of the third lens group G3 that has a greater impact on the edge image field. By limiting this distance, the third lens group G3 can precisely control the refraction path of the edge light rays, so that the convergence point of the edge light rays moves closer to the focusing plane of the center light rays, and finally achieves the consistency between the center and edge image planes, thus achieving the purpose of correcting field curvature.

[0145] It is important to understand that, as shown in Figure 4, when the third lens group G3 includes a lens L31, the total thickness Tm of all lenses at the position of the first straight line 32 in the third lens group G3 is the thickness of lens L31 at the position of the first straight line 32, and the total thickness Tc of all lenses at the position of the second optical axis 31 is the thickness of lens L31 at the position of the second optical axis 31.

[0146] When the third lens group G3 includes multiple lenses, such as lens L31 and lens L32, the total thickness Tm of all lenses at the position of the first straight line 32 is the sum of the thicknesses of each lens (such as lens L31 and lens L32) at the position of the first straight line 32; the total thickness Tc of all lenses at the position of the second optical axis 31 is the sum of the thicknesses of each lens (such as lens L31 and lens L32) at the position of the second optical axis 31.

[0147] The concept of effective area diameter is explained in detail below. Effective area diameter is divided into the effective area diameter of a single lens and the effective area diameter of a lens group (including multiple lenses), as described below:

[0148] (1) Effective area diameter of a single lens

[0149] The effective area diameter of a lens is the maximum diameter of its physical light-transmitting region (i.e., the aperture), and is usually determined by the lens's edge. If the lens edge has a coating, mounting frame, or other obstructing structure, the thickness of these parts must be subtracted to obtain the actual diameter of the light-transmitting region. For example, as shown in Figure 4, lens L31 has an opaque frosted area 33 at its edge; therefore, the diameter of the area of ​​lens L31 located inside the frosted area 33 (closer to the optical axis) is the effective area diameter. As another example, as shown in Figure 3, lens L11 has an aperture stop 5 at its edge, and the edge of lens L11 is obstructed by the aperture stop 5; therefore, the aperture stop 5 is the effective area diameter of lens L11.

[0150] (2) Effective area diameter of the lens group

[0151] The effective diameter of a lens group is the smallest aperture that restricts the light beam within the lens group. The effective diameter is determined by the element with the smallest aperture in the lens group. Determining the effective diameter requires traversing all elements in the lens group (including individual aperture stops and lenses) to find the one with the smallest aperture, and then defining the effective diameter of that lens group as the minimum effective diameter. For example, as shown in Figure 3, the element with the smallest aperture in the first lens group G1 is lens L14; therefore, the aperture of lens L14 is the effective diameter of the first lens group G1.

[0152] In some embodiments, as shown in Figures 3 and 4, in the third lens group G3, the total thickness Tm of all lenses at the position of the first straight line 32 and the total thickness Tc at the position of the second optical axis 31 satisfy: Tc / Tm≤0.82, for example, Tc / Tm can be 0.78, 0.76, 0.81, etc.

[0153] By setting Tc / Tm to less than or equal to 0.82, the thickness difference between the third lens group G3 at the position of the first straight line 32 and the position of the second optical axis 31 is larger. The third lens group G3 at the position of the first straight line 32 has a stronger ability to refract light, which can focus the edge light and the center light on the same plane, thereby better correcting the field curvature of the optical lens 100.

[0154] In some embodiments, as shown in Figures 3 and 4, in the third lens group G3, the total thickness Tm of all lenses at the position of the first straight line 32 and the total thickness Tc at the position of the second optical axis 31 satisfy: Tc / Tm≥0.75.

[0155] This configuration avoids an excessive thickness difference between the third lens group G3 at the position of the first straight line 32 and the position of the second optical axis 31. An excessive thickness difference would not only increase aberrations such as spherical aberration and coma in the optical lens 100, but also increase the manufacturing difficulty of the lenses in the third lens group G3, hindering cost reduction. Therefore, setting Tc / Tm to greater than or equal to 0.75 is beneficial for controlling aberrations such as spherical aberration and coma in the optical lens 100, and also reduces the manufacturing difficulty of the lenses in the third lens group G3.

[0156] In some embodiments, as shown in Figures 3 and 4, k = 0.35, which means the distance between the first straight line 32 and the second optical axis 31 is 0.35Do.

[0157] By setting k to 0.35, the distance range between the first straight line 32 and the second optical axis 31 covers the area in the effective area 33 of the third lens group G3 that has the greatest impact on the edge image field. The third lens group G3 can more precisely control the refraction path of the edge light rays, so that the convergence point of the edge light rays is closer to the focusing plane of the central light rays, thereby making the correction effect of the 100-field curvature of the optical lens better.

[0158] In some embodiments, as shown in FIG3, the effective area diameter Do of the third lens group G3 and the image height IMH of the optical lens satisfy:

[0159] Do / (2˙IMH)≤1.2, for example, Do / (2˙IMH) can be 1.02, 1.04, 1.07, 1.10, 1.12, 1.15, 1.18, 1.19, etc.

[0160] The image height IMH of the optical lens is half the diagonal length of the effective photosensitive area on the photosensitive element 200.

[0161] This configuration avoids a significant difference between the effective area diameter Do of the third lens group G3 and the diagonal length of the effective photosensitive area on the photosensitive element 200. A large difference would hinder control over the angle and path of light entering the photosensitive element 200, thus making it difficult to reduce large field-of-view aberrations. By setting Do / (2˙IMH) to less than or equal to 1.2, the imaging light rays at the edge of the optical lens 100's field of view are smoothed, which helps to reduce large field-of-view aberrations.

[0162] In some embodiments, as shown in FIG3, the effective region diameter Do of the third lens group G3 and the effective region diameter D2 of the second lens group G2 (e.g., the effective region diameter of lens L21) satisfy:

[0163] 0.3 ≤ D² / Do ≤ 2. For example, D² / Do can be 0.3, 0.45, 0.46, 0.52, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, etc.

[0164] This setting avoids D2 / Do being too large or too small. If D2 / Do is too large, meaning the effective area diameter D2 of the second lens group G2 is large, it is not conducive to controlling the angle and path of light entering the third lens group G3, thus hindering the reduction of large field-of-view aberrations. If D2 / Do is too small, meaning the effective area diameter D2 of the second lens group G2 is small, the second lens group G2 will block too much light from the large field of view, which is detrimental to improving the imaging effect of the large field of view. By setting D2 / Do to 0.3≤D2 / Do≤2, large field-of-view aberrations can be reduced, and the imaging effect of the large field of view can be improved.

[0165] In some embodiments, as shown in FIG3, the effective area diameter DL1 of the lens farthest from the incident area 41 in the first lens group G1 (e.g., lens L11) and the effective area diameter DL2 of the lens closest to the incident area 41 in the second lens group G2 (e.g., lens L21) satisfy the following:

[0166] 1.2≤DL1 / DL2≤2.5. For example, DL1 / DL2 can be 1.2, 1.3, 1.36, 1.45, 1.51, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, etc.

[0167] This setting avoids DL1 / DL2 being too large or too small. If DL1 / DL2 is too large, meaning the effective area diameter DL1 of the lens farthest from the incident area 41 in the first lens group G1 is large, it is not conducive to controlling the angle and path of light entering the second lens group G2, thus hindering the reduction of large field-of-view aberrations. If DL1 / DL2 is too small, meaning the effective area diameter D2 of the lens closest to the incident area 41 in the second lens group G2 is small, the second lens group G2 will block too much light from the large field of view, which is detrimental to improving the imaging effect of the large field of view. By setting DL1 / DL2 to 1.2≤DL1 / DL2≤2.5, large field-of-view aberrations can be reduced, and the imaging effect of the large field of view can be improved.

[0168] In the optical lens 100, the focusing method is not unique. In some embodiments, as shown in FIG3, the second lens group G2 can be a focusing group, or the first lens group G1 and the second lens group G2 constitute a front lens group, and the entire front lens group is a focusing group, which can move along the first optical axis 11.

[0169] In other embodiments, as shown in FIG3, the first lens group G1 can also be a focusing group and can be moved along the first optical axis 11. Compared to setting the second lens group G2 or the front lens group as the focusing group, by setting the first lens group G1 as the focusing group, the optical lens 100 can achieve a closer focusing distance, thereby improving the macro imaging quality of the optical lens 100.

[0170] As shown in Figure 3, when the optical lens 100 switches from focusing on a distant scene (as shown in Figure 3) to focusing on a close scene, the first lens group G1 moves along the first optical axis 11 in a direction away from the second lens group G2 (for example, upward in Figure 3), and the gap between the first lens group G1 and the second lens group G2 increases; when the optical lens 100 switches from focusing on a close scene to focusing on a distant scene, the first lens group G1 moves along the first optical axis 11 in a direction closer to the second lens group G2, and the gap between the first lens group G1 and the second lens group G2 decreases.

[0171] It's important to understand that: "Optical lens 100 focusing on close-up" means the optical lens 100 can clearly image the subject at a first object distance; "Optical lens 100 focusing on distant-upper-view" means the optical lens 100 can clearly image the subject at a second object distance, which is greater than the first object distance. The first object distance can be the maximum object distance at which the optical lens 100 can clearly image, such as infinity, and the second object distance can be the minimum object distance at which the optical lens 100 can clearly image, such as 150mm.

[0172] In the optical lens 100, the method of image stabilization is not unique. In some embodiments, as shown in FIG3, the first lens group G1 can be an image stabilization lens group, which can move along a direction perpendicular to the first optical axis 11 (such as the Y direction).

[0173] In other embodiments, as shown in FIG3, the first lens group G1 and the second lens group G2 constitute an image stabilization lens group, which can move along a direction perpendicular to the first optical axis 11 (e.g., the Y direction). Compared to setting the first lens group G1 as the image stabilization lens group, by setting the first lens group G1 and the second lens group G2 as an entire image stabilization lens group, the overall movement of the first lens group G1 and the second lens group G2 can better balance the jitter torque, effectively counteract the jitter tendency of the electronic device, and thus achieve a better image stabilization effect.

[0174] In addition, the overall movement of the first lens group G1 and the second lens group G2 can maintain the stability of light tracking in the optical lens 100 to a greater extent, and can reduce the light deviation that may be caused by the individual movement of the lens group. This can better ensure image quality and avoid problems such as blurring or ghosting caused by changes in light tracking, thereby achieving a better image stabilization effect.

[0175] In some embodiments, as shown in FIG3, the effective focal length F1 of the first lens group G1 and the effective focal length EFL of the optical lens satisfy:

[0176] 0.3≤F1 / EFL≤0.9, for example, F1 / EFL can be 0.3, 0.4, 0.5, 0.6, 0.68, 0.57, 0.51, 0.7, 0.8, 0.9, etc.

[0177] This setting avoids both excessively large and excessively small F1 / EFL. If F1 / EFL is set too large, meaning the effective focal length F1 of the first lens group G1 is large, a larger lens size or an increase in the radius of curvature of the lens in the first lens group G1 would be required to achieve a larger F1. This would increase the volume of the first lens group G1, which would be detrimental to reducing the volume of the optical lens 100. At the same time, if F1 / EFL is set too large when the first lens group G1 is used as the focusing group for focusing, it would weaken the macro imaging function of the optical lens 100 and increase the focusing distance, which would be detrimental to reducing the size of the focusing motor, and thus also detrimental to reducing the size of the optical lens 100.

[0178] If the F1 / EFL is set too small, that is, the effective focal length F1 of the first lens group G1 is small, the ability of the first lens group G1 to converge light is weak. As a result, the second lens group G2 and the third lens group G3 need to undertake more tasks of light convergence and image correction. This puts higher demands on the design and performance of subsequent lens groups, which is not conducive to simplifying the structure and size of the second lens group G2 and the third lens group G3, and thus not conducive to reducing the size of the optical lens 100.

[0179] By setting F1 / EFL to 0.3≤F1 / EFL≤0.9, firstly, the structure of the first lens group G1 can be simplified and its volume reduced; secondly, the macro imaging function of the optical lens 100 can be improved and the focusing stroke of the first lens group G1 can be reduced; and thirdly, the structure and volume of the second lens group G2 and the third lens group G3 can be simplified, thereby helping to reduce the volume of the optical lens 100.

[0180] In some embodiments, as shown in FIG3, the effective focal length F2 of the second lens group G2 and the effective focal length EFL of the optical lens satisfy:

[0181] -1.36≤F2 / EFL≤-0.78. For example, F2 / EFL can be -1.376, -0.857, -0.775, etc.

[0182] This setting avoids both excessively large and excessively small F2 / EFL. If F2 / EFL is set too large, meaning the refractive power of the second lens group G2 is too strong, it will introduce more aberrations, such as spherical aberration and chromatic aberration, which is detrimental to aberration correction. Conversely, if F2 / EFL is set too small, meaning the refractive power of the second lens group G2 is too weak, it will also introduce more aberrations, such as spherical aberration and chromatic aberration, which is also detrimental to aberration correction. By setting F2 / EFL to -1.36 ≤ F2 / EFL ≤ -0.78, the effective focal length F2 of the second lens group G2 is kept within a reasonable range, which is beneficial for aberration correction of the optical lens 100 and thus improves the image quality of the optical lens 100.

[0183] In some embodiments, as shown in FIG3, the field of view (FOV) of the optical lens 100 satisfies:

[0184] FOV ≤ 30°, for example, FOV can be 30°, 28°, 25°, 22.3°, etc.

[0185] This setting avoids an excessively large field of view (FOV) for the optical lens 100. If the FOV is too large, the angle of incidence of light at the edges of the lens is larger, resulting in different propagation paths and intensities compared to the center. This can easily lead to inconsistent brightness between the image center and edges, and poor light uniformity. By setting the FOV to ≤30°, the optical lens 100 not only possesses the characteristics of a telephoto lens but also improves light uniformity, thereby enhancing the image quality.

[0186] In some embodiments, as shown in FIG3, the field of view (FOV) of the optical lens 100 satisfies:

[0187] FOV ≥ 21°.

[0188] This setting avoids an excessively small field of view (FOV) for the optical lens 100. If the FOV of the optical lens 100 is set too small, the shooting range is small, requiring more precise positioning of the subject and more accurate focusing, thus increasing the difficulty of focusing. Setting the FOV to ≥ 21° helps reduce the difficulty of focusing.

[0189] In some embodiments, as shown in FIG3, the aperture number Fno of the optical lens 100 satisfies:

[0190] Fno ≥ 2.5, for example, Fno can be 2.6, 2.8, 3.3, etc.

[0191] This setting avoids the aperture number Fno of the optical lens 100 being too small. If the aperture number Fno of the optical lens 100 is set too small, the light refraction at the edges of the optical lens 100 will be more complex, easily leading to aberrations and other problems, resulting in a decrease in image quality at the edges of the image. By setting the aperture number Fno of the optical lens 100 to Fno≥2.5, aberrations of the optical lens 100 can be reduced, which helps to improve the image quality at the edges of the image formed by the optical lens 100.

[0192] In some embodiments, as shown in FIG3, the aperture number Fno of the optical lens 100 satisfies:

[0193] Fno≤3.4.

[0194] This setting avoids making the aperture number Fno of the optical lens 100 too large. If the aperture number Fno of the optical lens 100 is set too large, the amount of light entering the optical lens 100 will be insufficient. In low-light environments, this will result in underexposure of the image image, making it dark and affecting the image quality of the optical lens 100. By setting the aperture number Fno of the optical lens 100 to Fno≤3.4, the amount of light entering the optical lens 100 is increased, thereby improving the image quality of the optical lens 100 in low-light environments.

[0195] In some embodiments, as shown in FIG3, the incident area 41 and the exit area 42 are located on the same side of the optical path folding element 4, and the protrusion height h2 of the third lens group G3 relative to the exit area 42 is less than the protrusion height h1 of the first lens group G1 relative to the incident area 41.

[0196] This configuration allows the front lens group (i.e., the first lens group G1 and the second lens group G2 as a whole) and the third lens group G3 to overlap in size along the first optical axis 11, avoiding the third lens group G3 from adding extra height to the optical lens 100 (i.e., the Z-axis dimension of the optical lens 100), thereby allowing the optical lens 100 to have a smaller height, which in turn can compress the volume of the camera module 400.

[0197] Meanwhile, the third lens group G3 can share the burden of correcting field curvature of the front lens group, so the front lens group does not need to set up a complex structure for correcting field curvature, such as increasing the number of lenses, which is conducive to reducing the height of the front lens group, thereby reducing the height of the optical lens 100 and reducing the volume of the camera module 400.

[0198] In some embodiments, as shown in FIG3, the optical path folding element 4 is a triple reflection prism, and includes a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 and the exit area 42 are both located on the first prism surface 43. The first prism surface 43 is a total reflection surface, and the third prism surface 45 and the fourth prism surface 46 are reflection surfaces and are inclined relative to the first direction Z.

[0199] Wherein, the first direction Z is parallel to the first optical axis 11, the second direction Y is perpendicular to the first optical axis 11 and parallel to the optical axis section of the optical lens 100, and the optical axis section of the optical lens 100 is a section that includes the first optical axis 11, the second optical axis 31 and the optical path folding element 4, that is, the optical axes of the first optical axis 11, the second optical axis 31 and the optical path folding element 4 are all located on the optical axis section of the optical lens 100.

[0200] As shown in Figure 3, the optical axis of the optical path folding element 4 is a broken line a1a2–a2a3–a3a4–a4a5 (as shown by the dashed line in the optical path folding element 4 in Figure 3). After the light enters the optical path folding element 4 from the incident area 41, it is reflected three times in sequence by the third prism surface 45, the first prism surface 43 and the fourth prism surface 46, and then exits from the exit area 42.

[0201] This setup utilizes the total internal reflection effect of the prism surface to refract light, allowing for precise control of the light refraction path. This ensures that the light propagates along a predetermined path, guaranteeing efficient light transmission and improving image brightness and quality.

[0202] In some embodiments, as shown in FIG3, the first prism surface 43 and the second prism surface 44 may both be perpendicular to the first direction Z. The term "perpendicular" in this embodiment can mean absolutely perpendicular or approximately perpendicular (e.g., with a deviation within 2°).

[0203] In some embodiments, the third prism surface 45 and the fourth prism surface 46 are coated with reflective films.

[0204] In some embodiments, as shown in Figure 3, the angle θ1 between the third prism surface 45 and the first prism surface 43, and the angle θ2 between the fourth prism surface 46 and the first prism surface 43, satisfy the following condition: 27°≤θ1=θ2≤34°. For example, θ1 can be 33.49°, 32.14°, etc.

[0205] By setting the included angles θ1 and θ2 to 27°≤θ1=θ2≤34°, the light in the optical path folding element 4 can meet the condition of total internal reflection, and the included angle θ1 can be set too large, which would result in a large height of the optical path folding element 4. This is beneficial to reduce the height of the optical lens 100 and compress the volume of the camera module.

[0206] Figure 5 is a schematic diagram of the camera module 400 in the second embodiment of this application. The main difference between the camera module 400 in Figure 5 and the camera module 400 in Figure 3 is that the structure of the optical path folding element 4 is different. The optical path folding element 4 in the camera module 400 in Figure 5 is a five-fold reflection prism, as described below:

[0207] As shown in Figure 5, the optical path folding element 4 is a five-fold reflection prism, including a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 and the exit area 42 are both located on the first prism surface 43. The first prism surface 43 and the second prism surface 44 are both total reflection surfaces, and the third prism surface 45 and the fourth prism surface 46 are reflection surfaces, and are inclined relative to the first direction Z.

[0208] As shown in Figure 5, the optical axis of the optical path folding element 4 is a broken line b1b2–b2b3–b3b4–b4b5–b5b6–b6b7 (as shown by the dashed line in the optical path folding element 4 in Figure 5). After the light enters the optical path folding element 4 from the incident area 41, it undergoes five reflections in sequence through the third prism surface 45, the first prism surface 43, the second prism surface 44, the first prism surface 43, and the fourth prism surface 46 before exiting from the exit area 42.

[0209] In some embodiments, as shown in FIG5, the first prism surface 43 and the second prism surface 44 are both perpendicular to the first direction Z.

[0210] In some embodiments, the third prism surface 45 and the fourth prism surface 46 are coated with reflective films.

[0211] In some embodiments, as shown in FIG5, the included angle θ1 between the third prism surface 45 and the first prism surface 43, and the included angle θ2 between the fourth prism surface 46 and the first prism surface 43 satisfy: 27°≤θ1=θ2≤34°. For example, θ1 can be 28°, etc.

[0212] By setting the included angles θ1 and θ2 to 27°≤θ1=θ2≤34°, the light in the optical path folding element 4 can meet the condition of total internal reflection, and the included angle θ1 can be set too large, which would result in a large height of the optical path folding element 4. This is beneficial to reduce the height of the optical lens 100 and compress the volume of the camera module.

[0213] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 3, and will not be described in detail here.

[0214] Figure 6 is a schematic diagram of the camera module 400 in the third embodiment of this application. The main difference between the camera module 400 in Figure 6 and the camera module 400 in Figure 3 is that the structure of the optical path folding element 4 is different. In the camera module 400 in Figure 6, the optical path folding element 4 is a secondary reflection prism, as described below:

[0215] As shown in Figure 6, the optical path folding element 4 is a secondary reflection prism, and includes a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 and the exit area 42 are both located on the first prism surface 43. The first prism surface 43 is a total reflection surface, and the third prism surface 45 and the fourth prism surface 46 are reflection surfaces, and are inclined relative to the first direction Z.

[0216] The optical axis of the optical path folding element 4 is a broken line c1c2–c2c3–c3c4 (as shown by the dashed line in the optical path folding element 4 in Figure 6). After the light enters the optical path folding element 4 from the incident area 41, it is reflected twice by the third prism surface 45 and the fourth prism surface 46 in sequence, and then exits from the exit area 42.

[0217] In some embodiments, as shown in FIG6, the first prism surface 43 and the second prism surface 44 are both perpendicular to the first direction Z; the angle θ1 between the third prism surface 45 and the first prism surface 43 and the angle θ2 between the fourth prism surface 46 and the first prism surface 43 satisfy: θ1=θ2=45°.

[0218] In some embodiments, the third prism surface 45 and the fourth prism surface 46 are coated with reflective films.

[0219] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 3, and will not be described in detail here.

[0220] Figure 7 is a schematic diagram of the camera module 400 in the fourth embodiment of this application. The main differences between the camera module 400 in Figure 7 and the camera module 400 in Figure 3 are: the structure of the optical path folding element 4 is different, and the position of the third lens group G3 relative to the optical path folding element 4 is different, as described below:

[0221] As shown in Figure 7, the incident area 41 and the exit area 42 are located on different sides of the optical path folding element 4. For example, the incident area 41 and the exit area 42 can be located on adjacent sides of the optical path folding element 4. The projection of the third lens group G3 along the second direction Y on the optical path folding element 4 is located in the exit area 42. The second direction Y is perpendicular to the first optical axis 11 and parallel to the optical axis section of the optical lens.

[0222] This configuration allows the third lens group G3 and the optical path folding element 4 to overlap in size along the first optical axis 11, avoiding the third lens group G3 from adding extra height to the optical lens 100 (i.e., the Z-axis dimension of the optical lens 100). This results in a smaller height for the optical lens 100, thereby reducing the size of the camera module 400. Simultaneously, the third lens group G3 can share the burden of correcting field curvature with the front lens group (i.e., the first lens group G1 and the second lens group G2 as a whole). The front lens group then does not need a complex structure for field curvature correction, such as increasing the number of lenses, which helps reduce its height. This, in turn, reduces the height of the optical lens 100 and shrinks the size of the camera module 400.

[0223] In some embodiments, as shown in FIG7, the optical path folding element 4 is a secondary reflection prism, and includes a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 is located on the first prism surface 43, and the exit area 42 is located on the fourth prism surface 46. The first prism surface 43 is perpendicular to the first direction Z, and the fourth prism surface 46 is parallel to the first direction Z, that is, the first optical axis 11 is perpendicular to the second optical axis 31. The second prism surface 44 and the third prism surface 45 are reflective surfaces and are inclined relative to the first direction Z.

[0224] The optical axis of the optical path folding element 4 is a broken line e1e2–e2e3–e3e4 (as shown by the dashed line in the optical path folding element 4 in Figure 7). After the light enters the optical path folding element 4 from the incident area 41, it is reflected twice by the second prism surface 44 and the third prism surface 44 in sequence, and then exits from the exit area 42.

[0225] The second prism surface 44 and the third prism surface 45 are coated with reflective films.

[0226] In some embodiments, as shown in FIG7, the optical path folding element 4 is a pentagonal prism, the angle between the second prism surface 44 and the third prism surface 45 is 45°, and the angle between the first prism surface 43 and the third prism surface 45 is equal to the angle between the second prism surface 44 and the fourth prism surface 46.

[0227] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 3, and will not be described in detail here.

[0228] Figure 8 is a schematic diagram of the camera module 400 in the fifth embodiment of this application. The main difference between the camera module 400 in Figure 8 and the camera module 400 in Figure 7 is that the structure of the optical path folding element 4 is different. The emission area 42 in Figure 8 is located on the fourth prism surface 46, and the fourth prism surface 46 is inclined relative to the first direction Z, as described below:

[0229] As shown in Figure 8, the incident area 41 and the exit area 42 are located on different sides of the optical path folding element 4. For example, the incident area 41 and the exit area 42 can be located on adjacent sides of the optical path folding element 4. The projection of the third lens group G3 along the second direction Y on the optical path folding element 4 is located in the exit area 42.

[0230] As shown in Figure 8, the optical path folding element 4 is a secondary reflection prism, and includes a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 is located on the first prism surface 43, and the exit area 42 is located on the fourth prism surface 46. The first prism surface 43 is a total reflection surface, and the third prism surface 45 is a reflection surface. Both the third prism surface 45 and the fourth prism surface 46 are inclined relative to the first direction Z.

[0231] The optical axis of the optical path folding element 4 is a broken line m1m2–m2m3–m3m4 (as shown by the dashed line in the optical path folding element 4 in Figure 8). After the light enters the optical path folding element 4 through the incident area 41, it is reflected twice by the third prism surface 45 and the first prism surface 43 in sequence, and then exits from the exit area 42.

[0232] In some embodiments, as shown in FIG8, both the first prism surface 43 and the second prism surface 44 are perpendicular to the first direction Z.

[0233] In some embodiments, a reflective film is coated on the third prism surface 45.

[0234] In some embodiments, as shown in Figure 8, the angle θ between the third prism surface 45 and the first prism surface 43, and the angle θ2 between the fourth prism surface 46 and the first prism surface 43 satisfy: 27°≤θ1≤34°, θ2>θ1. For example, θ1 can be 33.49°, 32.14°, etc.

[0235] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 7, and will not be described in detail here.

[0236] Figure 9 is a schematic diagram of the camera module 400 in the sixth embodiment of this application. The main difference between the camera module 400 in Figure 9 and the camera module 400 in Figure 7 is that the structure of the optical path folding element 4 is different. The emission area 42 in Figure 9 is located on the fourth prism surface 46, and the fourth prism surface 46 is tilted relative to the first direction Z, as described below:

[0237] As shown in Figure 9, the incident area 41 and the exit area 42 are located on different sides of the optical path folding element 4. For example, the incident area 41 and the exit area 42 can be located on adjacent sides of the optical path folding element 4. The projection of the third lens group G3 along the second direction Y on the optical path folding element 4 is located in the exit area 42.

[0238] The optical path folding element 4 is a triple-reflection prism, including a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 is located on the first prism surface 43, and the exit area 42 is located on the fourth prism surface 46. The fourth prism surface 46 is inclined relative to the first direction Z. The first prism surface 43 and the fourth prism surface 46 are total reflection surfaces, and the third prism surface 45 is a reflection surface. Both the third prism surface 45 and the fourth prism surface 46 are inclined relative to the first direction Z.

[0239] The optical axis of the optical path folding element 4 is a broken line o1o2–o2o3–o3o4–o4o5 (as shown by the dashed line in the optical path folding element 4 in Figure 9). After the light enters the optical path folding element 4 through the incident area 41, it is reflected three times in sequence by the fourth prism surface 46, the third prism surface 45 and the first prism surface 43, and then exits through the exit area 42.

[0240] In some embodiments, as shown in FIG9, the first prism surface 43 and the second prism surface 44 are both perpendicular to the first direction Z.

[0241] In some embodiments, a reflective film is coated on the third prism surface 45.

[0242] In some embodiments, as shown in FIG9, the optical path folding element 4 is a Schmitt prism, the included angle between the first prism surface 43 and the fourth prism surface 46 is 45°, and the included angle between the first prism surface 43 and the third prism surface 45 is equal to the included angle between the third prism surface 45 and the fourth prism surface 46 and is 67.5°.

[0243] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 7, and will not be described in detail here.

[0244] Figure 10 is a schematic diagram of the camera module 400 in the seventh embodiment of this application. The main difference between the camera module 400 in Figure 10 and the camera module 400 in Figure 7 is that the structure of the optical path folding element 4 is different. The emission area 42 in Figure 10 is located on the fourth prism surface 46, and the fourth prism surface 46 is inclined relative to the first direction Z, as described below:

[0245] As shown in Figure 10, the incident area 41 and the exit area 42 are located on different sides of the optical path folding element 4. For example, the incident area 41 and the exit area 42 can be located on adjacent sides of the optical path folding element 4. The projection of the third lens group G3 along the second direction Y on the optical path folding element 4 is located in the exit area 42.

[0246] As shown in Figure 10, the optical path folding element 4 is a four-fold reflection prism, including a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 is located on the first prism surface 43, and the exit area 42 is located on the fourth prism surface 46. The first prism surface 43 and the second prism surface 44 are total reflection surfaces, and the third prism surface 45 is a reflection surface. The third prism surface 45 and the fourth prism surface 46 are both inclined relative to the first direction Z.

[0247] The optical axis of the optical path folding element 4 is a broken line p1p2–p2p3–p3p4–p4p5–p5p6 (as shown by the dashed line in the optical path folding element 4 in Figure 10). After the light enters the optical path folding element 4 through the incident area 41, it is reflected four times in sequence by the third prism surface 45, the first prism surface 43, the second prism surface 44, and the first prism surface 43, and then exits through the exit area 42.

[0248] In some embodiments, as shown in FIG10, the first prism surface 43 and the second prism surface 44 are both perpendicular to the first direction Z.

[0249] In some embodiments, a reflective film is coated on the third prism surface 45.

[0250] In some embodiments, as shown in FIG10, the included angle θ between the third prism surface 45 and the first prism surface 43, and the included angle θ2 between the fourth prism surface 46 and the first prism surface 43 satisfy: 27°≤θ1≤34°, θ2>θ1. For example, θ1 can be 33.49°, 32.14°, etc.

[0251] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figure 7, and will not be described in detail here.

[0252] Figure 11a is a schematic diagram of the camera module 400 in the eighth embodiment of this application. The main difference between the camera module 400 in Figure 11a and the camera modules 400 in Figures 7 to 10 is that the structure of the optical path folding element 4 is different. In Figure 11a, the incident area 41 and the exit area 42 are located on opposite sides of the optical path folding element 4, as described below:

[0253] As shown in Figure 11a, the incident region 41 and the exit region 42 are located on opposite sides of the optical path folding element 4.

[0254] In some embodiments, as shown in FIG11a, the optical path folding element 4 is a prism group, which includes a first prism 47 and a second prism 48.

[0255] The first prism 47 is a triple-reflection prism and includes a first incident surface 471, a first exit surface 472, and a first reflecting surface 473. The first incident surface 471 is disposed facing the second lens group G2. The first incident surface 471 and the first exit surface 472 are total reflection surfaces. The first exit surface 472 and the first reflecting surface 473 are both disposed at an angle relative to the first direction Z.

[0256] The second prism 48 is a secondary reflection prism and includes a second incident surface 481, a second exit surface 482, and a second reflecting surface 483. The second incident surface 481 is disposed facing the first exit surface 472 and is a total reflection surface. Both the second incident surface 481 and the second reflecting surface 483 are inclined relative to the first direction Z, and the second exit surface 482 and the first incident surface 471 are arranged along the first direction Z. The incident area 41 is located on the first incident surface 471, and the exit area 42 is located on the second exit surface 482.

[0257] The optical axis of the first prism 47 is a broken line t1t2–t2t3–t3t1–t1t4 (as shown by the dashed line in the first prism 47 in Figure 11a), and the optical axis of the second prism 48 is a broken line t5t6–t6t7–t7t8 (as shown by the dashed line in the second prism 48 in Figure 11a).

[0258] After entering the first prism 47 through the incident area 41, the light is reflected three times in sequence by the first exit surface 472, the first reflecting surface 473, and the first incident surface 471. Then, the light is emitted from the first exit surface 472 to the second incident surface 481 of the second prism 48. The light entering the second prism 48 through the second incident surface 481 is reflected twice by the second reflecting surface 483 and the second incident surface 481, and then exits through the exit area 42.

[0259] In some embodiments, as shown in FIG11a, the angle β1 between the first incident surface 471 and the first reflecting surface 473 and the angle β2 between the first exiting surface 472 and the first reflecting surface 473 satisfy: β1=β2. The angle α1 between the second incident surface 481 and the second reflecting surface 483 and the angle α2 between the second incident surface 481 and the second exiting surface 482 satisfy: α2=2α1.

[0260] In some embodiments, as shown in FIG11a, the first incident surface 471 and the second exit surface 482 are both perpendicular to the first direction Z.

[0261] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figures 7 to 10, and will not be described in detail here.

[0262] Figure 11b is a schematic diagram of the camera module 400 in the ninth embodiment of this application. The main difference between the camera module 400 in Figure 11b and the camera modules 400 in Figures 7 to 10 is that the structure of the optical path folding element 4 is different. In Figure 11b, the incident area 41 and the exit area 42 are located on opposite sides of the optical path folding element 4, as described below:

[0263] As shown in Figure 11b, the incident area 41 and the exit area 42 are located on opposite sides of the optical path folding element 4.

[0264] The optical path folding element 4 is a secondary reflection prism, and includes a first prism surface 43 and a second prism surface 44 arranged along the first direction Z, and a third prism surface 45 and a fourth prism surface 46 arranged along the second direction Y. The incident area 41 is located on the first prism surface 43, and the exit area 42 is located on the second prism surface 44. The third prism surface 45 and the fourth prism surface 46 are total reflection surfaces and are both inclined relative to the first direction Z.

[0265] The optical axis of the optical path folding element 4 is a broken line q1q2–q2q3–q3q4 (as shown by the dashed line in the optical path folding element 4 in Figure 11b). After the light enters the optical path folding element 4 from the incident area 41, it is reflected twice by the third prism surface 45 and the fourth prism surface 46 in sequence, and then exits from the exit area 42.

[0266] In some embodiments, as shown in FIG11b, the first prism surface 43 and the second prism surface 44 are both perpendicular to the first direction Z, and the included angle between the first prism surface 43 and the third prism surface 45 is equal to the included angle between the second prism surface 44 and the fourth prism surface 46, and is 45°.

[0267] As for the other structures of the camera module 400 in this embodiment, they can be set according to the camera module 400 shown in Figures 7 to 10, and will not be described in detail here.

[0268] Figure 12a is an optical path diagram of the optical lens 100 in the camera module 400 of the tenth embodiment of this application when focusing on a distant scene, and Figure 12b is an optical path diagram of the optical lens 100 in the camera module 400 of the tenth embodiment of this application when focusing on a close-up scene.

[0269] The main difference between the camera module 400 in Figures 12a and 12b and the camera module 400 in Figure 3 is that the latter provides specific parameters such as the radius of curvature, thickness, refractive index, Abbe number, aspherical coefficient, and focusing distance of the optical lens 100, as detailed below:

[0270] In some embodiments, as shown in Figures 12a and 12b, the first lens group G1 is a focusing group and is movable along the first optical axis 11. When the optical lens 100 switches from focusing on a distant view (as shown in Figure 12a) to focusing on a close view (as shown in Figure 12b), the first lens group G1 moves away from the second lens group G2 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 increases; when the optical lens 100 switches from focusing on a close view to focusing on a distant view, the first lens group G1 moves closer to the second lens group G2 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 decreases.

[0271] In some embodiments, as shown in Figures 12a and 12b, when the optical lens 100 switches from focusing on a distant object (object distance of infinity) to focusing on a close object (object distance of 150mm), the focusing travel of the first lens group G1 (i.e., the distance the first lens group G1 moves along the first optical axis 11) is 1.2mm.

[0272] In some embodiments, as shown in FIG12a, the first lens group G1 and the second lens group G2 constitute an image stabilization lens group, which can move along a direction perpendicular to the first optical axis 11 (e.g., the Y direction). Of course, it is not limited to this; the first lens group G1 can also be an image stabilization lens group.

[0273] In some embodiments, as shown in Figures 12a and 12b, in the optical path folding element 4, the included angle between the third prism surface 45 and the first prism surface 43 is equal to the included angle between the fourth prism surface 46 and the first prism surface 43 and is 33.49°.

[0274] The optical lens 100 shown in Figures 12a and 12b will be described in detail below with reference to specific parameters.

[0275] As shown in Tables 1.1 and 1.2, Table 1.1 shows the main parameters of the optical lens 100 in the tenth embodiment of this application, and Table 1.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the tenth embodiment of this application.

[0276] Table 1.1 Main parameters of the optical lens 100 in the tenth embodiment of this application

[0277] The units for the radius of curvature and thickness parameters in Table 1.1 are all mm.

[0278] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; S9 represents the image-side surface of lens L14; S11 represents the object-side surface of lens L21; and S12 represents the image-side surface of lens L21.

[0279] PRISM represents the optical path folding element 4, which is a prism with the function of folding light. S13 represents the first prism surface 43 of the optical path folding element 4, S14 represents the third prism surface 45 of the optical path folding element 4, S15 represents the first prism surface 43 of the optical path folding element 4, S16 represents the fourth prism surface 46 of the optical path folding element 4, and S17 represents the first prism surface 43 of the optical path folding element 4.

[0280] S18 represents the object-side surface of lens L31, and S19 represents the image-side surface of lens L31.

[0281] IRCF represents an infrared filter, S20 is the object-side surface of the filter, and S21 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 200.

[0282] In the table, the surface number S is in the "Thickness" parameter column. n The corresponding numerical value means surface number S n Surface to surface number S n+1 The distance of the surface along the optical axis; the rule for the sign of the thickness parameter is as follows: Starting with S... n The vertex of the surface (the intersection with the optical axis) is the origin for calculation, S n+1 The vertex of the surface is positive when it is on the right, negative when it is on the left, positive when it is below, and negative when it is above.

[0283] The radii of curvature in the table are the radii of curvature of the corresponding surface number at the optical axis; the rules for the sign of the radii of curvature parameter are as follows: Starting with S... n The vertex of the surface is the origin of the calculation. Positive values ​​are those with the center of the sphere on the right, negative values ​​are those with the center of the sphere on the left, positive values ​​are those at the bottom, and negative values ​​are those at the top. A radius of curvature of 1.00E+18 indicates that the surface corresponding to this parameter is a plane with an infinite radius of curvature.

[0284] It should be noted that the rules for the signs before the thickness parameters and the radius of curvature parameters in this table, as well as the surface number S in the "Thickness" parameter column of the table, are as follows. n The meanings of the corresponding numerical values ​​and thicknesses also apply to the tables below.

[0285] In some embodiments, the aspherical surfaces in the optical lens 100 can be defined using the following aspherical curve equation:

[0286] Where z is the relative distance between a point on the aspherical surface at a distance r from the optical axis and the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; A i For the i-th order aspherical coefficients, see Table 1.2 for details.

[0287] Table 1.2 Aspherical coefficients of the surfaces of the optical elements of the optical lens 100 in the tenth embodiment of this application

[0288] Figure 12c shows the axial spherical aberration curve, field curvature curve, and optical distortion curve of the optical lens 100 in the tenth embodiment of this application when focusing on a distant scene (object distance is infinity). Figure 12d shows the axial spherical aberration curve, field curvature curve, and optical distortion curve of the optical lens 100 in the tenth embodiment of this application when focusing on a close scene (object distance is 150mm).

[0289] Figure 12c shows the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, 470nm, 450nm, and 435nm). Figure 12d shows the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm).

[0290] The axial spherical aberration curves in Figures 12c and 12d illustrate the deviation of light of a corresponding wavelength emitted in a 0-degree field of view from the ideal image point after passing through the optical lens 100. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 12c and 12d are relatively small, indicating that the axial spherical aberration correction of the optical lens 100 is good.

[0291] Figures 12c and 12d illustrate the field curvature curves used to depict the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. In Figures 12c and 12d, the field curvature in both directions (sagittal and meridional) is relatively small, indicating that the system has good depth of focus.

[0292] The distortion curves in Figures 12c and 12d are used to illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 12c and 12d are small, ensuring that there is no obvious distortion in the image.

[0293] As can be seen from Figures 12c and 12d, the optical lens 100 in the tenth embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0294] Figure 12e shows the MTF curve of the optical lens 100 in the tenth embodiment of this application when focusing on a distant scene (object distance is infinity).

[0295] As shown in Figure 12e, the horizontal axis represents image height, and the vertical axis "MTF" represents the modulation transfer function value. The closer the value is to 1, the better the image sharpness and contrast of the optical lens 100. The curves of different line shapes represent the MTF values ​​in the tangential and sagittal directions at different spatial frequencies (90 LP / MM, 180 LP / MM, 360 LP / MM).

[0296] As shown in Figure 12e, the MTF value generally decreases with increasing spatial frequency (from 90 LP / MM to 360 LP / MM), indicating that the optical lens 100's ability to reproduce high-frequency details gradually weakens. At the same spatial frequency, the MTF values ​​differ in the meridional and sagittal directions, reflecting the different imaging performance of the optical lens 100 in different directions. With increasing image height (away from the image center), the MTF value generally decreases, indicating that the imaging quality at the edges of the optical lens 100 is inferior to that in the central area.

[0297] Figure 12f shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the tenth embodiment of this application during overall movement (movement distance of ±400u) image stabilization. Figure 12g shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the tenth embodiment of this application during overall movement (movement distance of ±400u) image stabilization.

[0298] As shown in Figures 12f and 12g, ois1 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the Y direction as a whole, and ois2 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the X direction as a whole. Both the X and Y directions are perpendicular to the first optical axis 11. The horizontal axis in the figures represents the image height, and the vertical axis "MTF" represents the modulation transfer function value. The curves with different line shapes in the figures represent the MTF values ​​in the meridional and sagittal directions at spatial frequencies of 90 LP / MM, 180 LP / MM, and 360 LP / MM, respectively.

[0299] Combining Figures 12e, 12f, and 12g, it can be seen that when the first lens group G1 and the second lens group G2 are used for overall motion stabilization, the decrease in the MTF value of the optical lens 100 is relatively small, indicating that the overall motion stabilization effect of the first lens group G1 and the second lens group G2 is good.

[0300] Figure 13a is an optical path diagram of the optical lens 100 in the camera module 400 of the eleventh embodiment of this application when focusing on a distant scene, and Figure 13b is an optical path diagram of the optical lens 100 in the camera module 400 of the eleventh embodiment of this application when focusing on a close-up scene.

[0301] The main difference between the camera module 400 in Figures 13a and 13b and the camera module 400 in Figures 12a and 12b lies in their focusing methods. The optical lens 100 in Figures 13a and 13b focuses by moving the second lens group G2, while the optical lens 100 in Figures 12a and 12b focuses by moving the first lens group G1, as detailed below:

[0302] In some embodiments, as shown in Figures 13a and 13b, the second lens group G2 is a focusing group and is movable along the first optical axis 11. When the optical lens 100 switches from focusing on a distant scene (as shown in Figure 13a) to focusing on a close scene (as shown in Figure 13b), the second lens group G2 moves away from the first lens group G1 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 increases; when the optical lens 100 switches from focusing on a close scene to focusing on a distant scene, the second lens group G2 moves closer to the first lens group G1 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 decreases.

[0303] In some embodiments, when the optical lens 100 switches from focusing on a distant object (object distance of infinity) to focusing on a close object (object distance of 150mm), the focusing travel of the second lens group G2 (i.e., the distance the second lens group G2 moves along the first optical axis 11) is 1.2mm.

[0304] In some embodiments, as shown in FIG13a, the first lens group G1 and the second lens group G2 constitute an image stabilization lens group, which can move along a direction perpendicular to the first optical axis 11 (e.g., the Y direction). Of course, it is not limited to this; the first lens group G1 can also be an image stabilization lens group.

[0305] In some embodiments, as shown in Figures 13a and 13b, in the optical path folding element 4, the included angle between the third prism surface 45 and the first prism surface 43 is equal to the included angle between the fourth prism surface 46 and the first prism surface 43 and is 32.14°.

[0306] The optical lens 100 shown in Figures 13a and 13b will be described in detail below with reference to specific parameters.

[0307] As shown in Tables 2.1 and 2.2, Table 2.1 shows the main parameters of the optical lens 100 in the eleventh embodiment of this application, and Table 2.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the eleventh embodiment of this application.

[0308] Table 2.1 Main parameters of the optical lens 100 in the eleventh embodiment of this application

[0309] The units for the radius of curvature and thickness parameters in Table 2.1 are all mm.

[0310] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; S9 represents the image-side surface of lens L14; S11 represents the object-side surface of lens L21; and S12 represents the image-side surface of lens L21.

[0311] PRISM represents the optical path folding element 4, which is a prism with the function of folding light. S13 represents the first prism surface 43 of the optical path folding element 4, S14 represents the third prism surface 45 of the optical path folding element 4, S15 represents the first prism surface 43 of the optical path folding element 4, S16 represents the fourth prism surface 46 of the optical path folding element 4, and S17 represents the first prism surface 43 of the optical path folding element 4.

[0312] S18 represents the object-side surface of lens L31, and S19 represents the image-side surface of lens L31.

[0313] IRCF represents an infrared filter, S20 is the object-side surface of the filter, and S22 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 200.

[0314] Table 2.2 Aspherical coefficients of the surfaces of the optical elements of the optical lens 100 in the eleventh embodiment of this application

[0315] Figure 13c shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens 100 in the eleventh embodiment of this application when focusing on a distant object (object distance is infinity). Figure 13d shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens 100 in the eleventh embodiment of this application when focusing on a close object (object distance is 150mm). Figures 13c and 13d show the axial spherical aberration curve, field curvature curve, and distortion curve corresponding to different wavelengths of the system (the figures include 650nm, 610nm, 555nm, 510nm, and 470nm).

[0316] The axial spherical aberration curves in Figures 13c and 13d illustrate the deviation of light of a corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical lens 100. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 13c and 13d are relatively small, indicating that the axial spherical aberration correction of the optical lens 100 is good.

[0317] Figures 13c and 13d show the field curvature curves illustrating the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the sagittal beam, and y represents the meridional beam. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. In Figures 13c and 13d, the field curvature in both directions (sagittal and meridional) is relatively small, indicating that the system has good depth of focus.

[0318] The distortion curves in Figures 13c and 13d are used to illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 13c and 13d are small, ensuring that there is no obvious distortion in the image.

[0319] As can be seen from Figures 13c and 13d, the optical lens 100 in the eleventh embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0320] Figure 13e shows the MTF curve of the optical lens 100 in the eleventh embodiment of this application when focusing on a distant scene (object distance is infinity).

[0321] As shown in Figure 13e, the horizontal axis represents image height, and the vertical axis "MTF" represents the modulation transfer function value. The closer the value is to 1, the better the image sharpness and contrast of the optical lens 100. The curves of different line shapes represent the MTF values ​​in the tangential and sagittal directions at different spatial frequencies (90 LP / MM, 180 LP / MM, 360 LP / MM).

[0322] As shown in Figure 13e, the MTF value generally decreases with increasing spatial frequency (from 90 LP / MM to 360 LP / MM), indicating that the optical lens 100's ability to reproduce high-frequency details gradually weakens. At the same spatial frequency, the MTF values ​​differ in the meridional and sagittal directions, reflecting the different imaging performance of the optical lens 100 in different directions. With increasing image height (away from the image center), the MTF value generally decreases, indicating that the imaging quality at the edges of the optical lens 100 is inferior to that in the central area.

[0323] Figure 13f shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the eleventh embodiment of this application during overall movement (movement distance of ±300u) image stabilization. Figure 13g shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the eleventh embodiment of this application during overall movement (movement distance of ±300u) image stabilization.

[0324] As shown in Figures 13f and 13g, ois1 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the Y direction as a whole, and ois2 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the X direction as a whole. Both the X and Y directions are perpendicular to the first optical axis 11. The horizontal axis in the figures represents the image height, and the vertical axis "MTF" represents the modulation transfer function value. The curves of different line types in the figures represent the MTF values ​​in the meridional and sagittal directions at spatial frequencies of 90 LP / MM, 180 LP / MM, and 360 LP / MM, respectively.

[0325] Combining Figures 13e, 13f, and 13g, it can be seen that when the first lens group G1 and the second lens group G2 are used for overall motion stabilization, the decrease in the MTF value of the optical lens 100 is relatively small, indicating that the overall motion stabilization effect of the first lens group G1 and the second lens group G2 is good.

[0326] Figure 14a is an optical path diagram of the optical lens 100 in the camera module 400 of the twelfth embodiment of the present application when focusing on a distant scene, and Figure 14b is an optical path diagram of the optical lens 100 in the camera module 400 of the twelfth embodiment of the present application when focusing on a close-up scene.

[0327] The main difference between the camera module 400 in Figures 14a and 14b and the camera module 400 in Figure 3 is that the latter provides specific parameters such as the radius of curvature, thickness, refractive index, Abbe number, aspherical coefficient, and focusing distance of the optical lens 100, as detailed below:

[0328] In some embodiments, as shown in Figures 14a and 14b, the first lens group G1 is a focusing group and is movable along the first optical axis 11. When the optical lens 100 switches from focusing on a distant scene (as shown in Figure 14a) to focusing on a close scene (as shown in Figure 14b), the first lens group G1 moves away from the second lens group G2 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 increases; when the optical lens 100 switches from focusing on a close scene to focusing on a distant scene, the first lens group G1 moves closer to the second lens group G2 along the first optical axis 11, and the gap between the first lens group G1 and the second lens group G2 decreases.

[0329] When the optical lens 100 switches from focusing on a distant scene (object distance is infinity) to focusing on a close scene (object distance is 200mm), the focusing travel of the first lens group G1 (i.e. the distance the first lens group G1 moves along the first optical axis 11) is 1.5mm.

[0330] In some embodiments, as shown in FIG14a, the first lens group G1 and the second lens group G2 constitute an image stabilization lens group, which can move along a direction perpendicular to the first optical axis 11 (e.g., the Y direction). Of course, it is not limited to this; the first lens group G1 can also be an image stabilization lens group.

[0331] In some embodiments, as shown in Figures 14a and 14b, in the optical path folding element 4, the included angle between the third prism surface 45 and the first prism surface 43 is equal to the included angle between the fourth prism surface 46 and the first prism surface 43 and is 28°.

[0332] The optical lens 100 shown in Figures 14a and 14b will be described in detail below with reference to specific parameters.

[0333] As shown in Tables 3.1 and 3.2, Table 3.1 shows the main parameters of the optical lens 100 in the twelfth embodiment of this application, and Table 3.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the twelfth embodiment of this application.

[0334] Table 3.1 Main parameters of the optical lens 100 in the twelfth embodiment of this application

[0335] The units for the radius of curvature and thickness parameters in Table 3.1 are all mm.

[0336] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; S9 represents the image-side surface of lens L14; S11 represents the object-side surface of lens L21; and S12 represents the image-side surface of lens L21.

[0337] PRISM represents the optical path folding element 4, which is a prism with the function of folding light. S13 represents the first prism surface 43 of the optical path folding element 4, S14 represents the third prism surface 45 of the optical path folding element 4, S15 represents the first prism surface 43 of the optical path folding element 4, S16 represents the second prism surface 44 of the optical path folding element 4, S17 represents the first prism surface 43 of the optical path folding element 4, S18 represents the fourth prism surface 46 of the optical path folding element 4, and S19 represents the first prism surface 43 of the optical path folding element 4.

[0338] S20 represents the object-side surface of lens L31, and S21 represents the image-side surface of lens L31.

[0339] IRCF represents an infrared filter, S22 is the object-side surface of the filter, and S24 is the image-side surface of the filter; IMA represents the image plane, which can be the photosensitive surface of the photosensitive element 200.

[0340] Table 3.2 Aspherical coefficients of the surfaces of the optical elements of the optical lens 100 in the twelfth embodiment of this application

[0341] Figure 14c shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens 100 in the twelfth embodiment of this application when focusing on a distant scene (object distance is infinity). Figure 14d shows the axial spherical aberration curve, field curvature curve, and distortion curve of the optical lens 100 in the twelfth embodiment of this application when focusing on a close scene (object distance is 200mm).

[0342] Figure 14c shows the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, 470nm, 450nm, and 435nm). Figure 14d shows the axial spherical aberration curves, field curvature curves, and distortion curves corresponding to different wavelengths of the system (650nm, 610nm, 555nm, 510nm, and 470nm).

[0343] The axial spherical aberration curves in Figures 14c and 14d illustrate the deviation of light of the corresponding wavelength emitted at a 0-degree field of view from the ideal image point after passing through the optical lens 100. The horizontal axis represents the deviation value along the optical axis, and the vertical axis represents the normalized coordinates at the pupil. The deviation values ​​in Figures 14c and 14d are relatively small, indicating that the axial spherical aberration correction of the optical lens 100 is good.

[0344] Figures 14c and 14d illustrate the field curvature curves used to demonstrate the deviation of the convergence point of the fine beam from the ideal imaging plane in different fields of view. x represents the beam in the sagittal direction, and y represents the beam in the meridional direction. The horizontal axis represents the deviation along the optical axis, and the vertical axis represents the corresponding field of view. When a field value is too large, the image quality of that field is poor or higher-order aberrations exist. In Figures 14c and 14d, the field curvature in both directions (sagittal and meridional) is relatively small, indicating that the system has good depth of focus.

[0345] The distortion curves in Figures 14c and 14d are used to illustrate the relative deviation between the beam convergence point (actual image height) and the ideal image height for different fields of view. The deviations shown in Figures 14c and 14d are small, ensuring that there is no obvious distortion in the image.

[0346] As can be seen from Figures 14c and 14d, the optical lens 100 in the twelfth embodiment of this application achieves low light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0347] Figure 14e shows the MTF curve of the optical lens 100 in the twelfth embodiment of this application when focusing on a distant scene (object distance is infinity).

[0348] As shown in Figure 14e, the horizontal axis represents image height, and the vertical axis "MTF" represents the modulation transfer function value. The closer the value is to 1, the better the image sharpness and contrast of the optical lens 100. The curves of different line shapes represent the MTF values ​​in the tangential and sagittal directions at different spatial frequencies (90 LP / MM, 180 LP / MM, 360 LP / MM).

[0349] As shown in Figure 14e, the MTF value generally decreases with increasing spatial frequency (from 90 LP / MM to 360 LP / MM), indicating that the optical lens 100's ability to reproduce high-frequency details gradually weakens. At the same spatial frequency, the MTF values ​​differ in the meridional and sagittal directions, reflecting the different imaging performance of the optical lens 100 in different directions. With increasing image height (away from the image center), the MTF value generally decreases, indicating that the imaging quality at the edges of the optical lens 100 is inferior to that in the central area.

[0350] Figure 14f shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the twelfth embodiment of this application during overall movement (movement distance of ±400u) image stabilization. Figure 14g shows the MTF curves of the first lens group G1 and the second lens group G2 in the optical lens 100 of the twelfth embodiment of this application during overall movement (movement distance of ±400u) image stabilization.

[0351] As shown in Figures 14f and 14g, ois1 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the Y direction as a whole, and ois2 in the figures can be the first lens group G1 and the second lens group G2 performing image stabilization along the X direction as a whole. Both the X and Y directions are perpendicular to the first optical axis 11. The horizontal axis in the figures represents the image height, and the vertical axis "MTF" represents the modulation transfer function value. The curves of different line types in the figures represent the MTF values ​​in the meridional and sagittal directions at spatial frequencies of 90 LP / MM, 180 LP / MM, and 360 LP / MM, respectively.

[0352] Combining Figures 14e, 14f, and 14g, it can be seen that when the first lens group G1 and the second lens group G2 perform overall motion stabilization, the decrease in the MTF value of the optical lens 100 is relatively small, indicating that the overall motion stabilization effect of the first lens group G1 and the second lens group G2 is good.

[0353] Table 4.1 Summary of main parameters of the optical lens 100 in the tenth to twelfth embodiments of this application

[0354] The types of cross-sectional lines in the accompanying drawings are for distinguishing different components and should not be construed as limiting the materials of the components. The accompanying drawings are for illustrating structural composition and are not shown to scale of the actual product.

[0355] While the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may arise based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0356] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0357] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0358] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. "Multiple" refers to at least two.

[0359] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0360] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, It includes a first lens group (G1), a second lens group (G2), a third lens group (G3), and an optical path folding element (4); The first lens group (G1) has a first optical axis (11), and the optical path folding element (4) includes an incident area (41) and an exit area (42). Along the first optical axis (11), the second lens group (G2) is disposed between the first lens group (G1) and the incident area (41). The incident area (41) is used to receive light rays passing through the first lens group (G1) and the second lens group (G2). The third lens group (G3) has a second optical axis (31), and the third lens group (G3) and the exit area (42) are arranged along the second optical axis (31). The optical path folding element (4) is used to reflect the light entering the optical path folding element (4) from the incident area (41) multiple times, and then shoot it from the exit area (42) to the third lens group (G3). In the third lens group (G3), the total thickness Tm of all lenses at the position of the first straight line (32) and the total thickness Tc at the position of the second optical axis (31) satisfy: Tc / Tm<1; Wherein, the first straight line (32) is parallel to the second optical axis (31) and the distance between it and the second optical axis (31) is kDo, 0.3≤k≤0.4, and Do is the effective area diameter of the third lens group (G3).

2. The optical lens according to claim 1, characterized in that, Tc / Tm≤0.

82.

3. The optical lens according to claim 1 or 2, characterized in that, k＝0.35。 4. The optical lens according to any one of claims 1 to 3, characterized in that, The effective area diameter Do of the third lens group (G3) and the image height IMH of the optical lens satisfy the following: Do / (2˙IMH)≤1.

2.

5. The optical lens according to any one of claims 1 to 4, characterized in that, The effective area diameter Do of the third lens group (G3) and the effective area diameter D2 of the second lens group (G2) satisfy: 0.3≤D2 / Do≤2.

6. The optical lens according to any one of claims 1 to 5, characterized in that, The third lens group (G3) has negative optical power and includes a single lens.

7. The optical lens according to any one of claims 1 to 6, characterized in that, The effective area diameter DL1 of the lens farthest from the incident area (41) in the first lens group (G1) and the effective area diameter DL2 of the lens closest to the incident area (41) in the second lens group (G2) satisfy the following: 1.2≤DL1 / DL2≤2.

5.

8. The optical lens according to any one of claims 1 to 7, characterized in that, The first lens group (G1) has positive optical power, and the second lens group (G2) has negative optical power.

9. The optical lens according to claim 8, characterized in that, The first lens group (G1) is a focusing group and can move along the first optical axis (11).

10. The optical lens according to claim 8 or 9, characterized in that, The first lens group (G1) includes four lenses along the object side to the image side. The first, second, and fourth lenses of the four lenses have positive optical power, and the third lens has negative optical power. The second lens group (G2) includes a single lens.

11. The optical lens according to any one of claims 1 to 10, characterized in that, The effective focal length F1 of the first lens group (G1) and the effective focal length EFL of the optical lens satisfy the following: 0.3≤F1 / EFL≤0.

9.

12. The optical lens according to any one of claims 1 to 11, characterized in that, The effective focal length F2 of the second lens group (G2) and the effective focal length EFL of the optical lens satisfy the following: -1.36≤F2 / EFL≤-0.

78.

13. The optical lens according to any one of claims 1 to 12, characterized in that, The first lens group (G1) and the second lens group (G2) constitute an image stabilization lens group, which can move in a direction perpendicular to the first optical axis (11).

14. The optical lens according to any one of claims 1 to 13, characterized in that, The incident area (41) and the exit area (42) are located on the same side of the optical path folding element (4), and the protrusion height h2 of the third lens group (G3) relative to the exit area (42) is less than the protrusion height h1 of the first lens group (G1) relative to the incident area (41).

15. The optical lens according to claim 14, characterized in that, The optical path folding element (4) is a multi-reflection prism, and includes a first prism surface (43) and a second prism surface (44) arranged along a first direction (Z), and a third prism surface (45) and a fourth prism surface (46) arranged along a second direction (Y); wherein, the first direction (Z) is parallel to the first optical axis (11), the second direction (Y) is perpendicular to the first optical axis (11), and parallel to the optical axis section of the optical lens; The incident area (41) and the exit area (42) are both located on the first prism surface (43), the first prism surface (43) is a total reflection surface, or the first prism surface (43) and the second prism surface (44) are both total reflection surfaces; The third prism surface (45) and the fourth prism surface (46) are reflective surfaces and are inclined relative to the first direction (Z).

16. The optical lens according to claim 15, characterized in that, The angle θ1 between the third prism surface (45) and the first prism surface (43) and the angle θ2 between the fourth prism surface (46) and the first prism surface (43) satisfy: 27°≤θ1=θ2≤34°.

17. The optical lens according to any one of claims 1 to 13, characterized in that, The incident area (41) and the exit area (42) are located on different sides of the optical path folding element (4), and the projection of the third lens group (G3) along the second direction (Y) on the optical path folding element (4) is located in the exit area (42), wherein the second direction (Y) is perpendicular to the first optical axis (11) and parallel to the optical axis section of the optical lens.

18. The optical lens according to any one of claims 1 to 17, characterized in that, The field of view (FOV) of the optical lens satisfies: 21°≤FOV≤30°; And / or, the aperture number Fno of the optical lens satisfies: 2.5≤Fno≤3.

4.

19. A camera module, characterized in that, It includes a photosensitive element (200) and an optical lens (100) according to any one of claims 1 to 18, wherein the photosensitive element (200) is disposed on the image side of the optical lens (100).

20. An electronic device, characterized in that, It includes a housing (500) and a camera module (400) as claimed in claim 19, the camera module (400) being mounted on the housing (500).

Images