Optical lens, camera module and electronic device

Abstract

The application relates to the technical field of optical lenses, and provides an optical lens, a camera module and electronic equipment, which can solve the problem that the focusing motor of a camera module is difficult to design in related technologies. The optical lens comprises a front lens group and a rear lens group located on the image side of the front lens group; the front lens group comprises a first turning element and at least one positive lens located on the object side of the first turning element; the first turning element has a first reflection surface; the first reflection surface is used for reflecting a light beam passing through the at least one positive lens to the rear lens group; the rear lens group is a focusing lens group and can move relative to the front lens group along the optical axis of the rear lens group; the effective focal length f g0 of the front lens group and the effective focal length f A of the optical lens in a focusing far scene state satisfy the following relationship: f A / f g0 <1.0. The application can be used on electronic equipment such as mobile phones.

Description

Optical lenses, camera modules and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on January 7, 2024, with application number 202410023387.6 and application name “Optical lens, camera module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical lens technology, and in particular to an optical lens, a camera module and an electronic device. Background Art

[0003] Camera modules have become an important component of electronic devices such as mobile phones and tablets. They allow users to easily capture desired photos, satisfying their photography needs. However, designing camera modules has become a key issue within the industry.

[0004] An optical lens of a camera module in the related art usually moves the entire optical lens along the optical axis to achieve the overlap of the imaging surface of the optical lens and the photosensitive surface of the photosensitive element when focusing. However, when this optical lens switches between the state of focusing on a distant view and the state of focusing on a close view, the focusing stroke is slightly short, but the focus motor needs to have extremely high focusing accuracy, which makes the design of the focus motor more difficult and is not conducive to reducing the cost of the camera module.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide an optical lens, a camera module, and an electronic device for solving the problem of difficulty in designing a focus motor for a camera module in the related art.

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

[0008] In a first aspect, an embodiment of the present application provides an optical lens, comprising a front lens group and a rear lens group located on the image side of the front lens group; the front lens group comprises a first turning element and at least one positive lens located on the object side of the first turning element, the first turning element having a first reflecting surface, the first reflecting surface being used to reflect a light beam passing through the at least one positive lens to the rear lens group, the rear lens group being a focusing lens group and being movable relative to the front lens group along the optical axis of the rear lens group; the effective focal length f of the front lens group g0 The effective focal length f of the optical lens in the focus state A Between: f A / f g0 <1.0.

[0009] The optical lens in the embodiment of the present application is provided with a reasonable effective focal length f of the optical lens. A The effective focal length f of the front lens group G0 g0 The ratio range, that is, f A / f g0 <1.0, which can make the focus stroke compression ratio of the optical lens relatively small, that is, the minimum value of the focus stroke compression ratio of the optical lens is less than 1. In this way, the focus stroke of the optical lens can be relatively long when switching between the state of focusing on the near view and the state of focusing on the distant view. This can reduce the focus accuracy requirements of the focus motor, thereby reducing the design difficulty of the focus motor, and further helping to reduce the cost of the camera module.

[0010] In some embodiments, f A / f g0 ≤0.38. With this setting, the optical lens can achieve a smaller object distance when focusing on a close-up scene (that is, the closest macro distance is smaller).

[0011] In some embodiments, f A / f g0 ≥0.392. This setting can reduce the total length of the optical lens.

[0012] In some embodiments, the minimum value of the focus stroke compression ratio of the rear lens group ξmin=|1-(f A / f g0 ) 2 |; ξmin satisfies: ξmin<1.0. This setting is beneficial to improving the focusing accuracy of the optical lens.

[0013] In some embodiments, ξmin≥0.855. This configuration helps shorten the focusing stroke of the rear lens group while ensuring the focusing accuracy of the optical lens.

[0014] In some embodiments, ξmin≤0.846. Such an arrangement is beneficial for further improving the focusing accuracy of the optical lens.

[0015] In some embodiments, the focus stroke compression ratio ξ of the rear lens group satisfies: 0.74≤ξ≤1.15. This arrangement helps shorten the focus stroke of the rear lens group while ensuring the focus accuracy of the optical lens.

[0016] In some embodiments, when the optical lens is in a close-up focusing state, ξ satisfies: ξ ≥ 0.9. This configuration helps to shorten the focusing distance when focusing on a close-up while ensuring the focusing accuracy.

[0017] In some embodiments, the effective focal length f of the rear lens group g1The effective focal length f of the optical lens in the focus state A Between: f A / f g1 ≥0.47. This setting can prevent the value of ξmin from being too small, thereby reducing the focusing stroke of the optical lens.

[0018] In some embodiments, f A / f g1 ≤1.5. This setting can prevent the value of ξmin from being too large, which is conducive to ensuring the focusing accuracy requirements of the optical lens.

[0019] In some embodiments, the effective focal length f of the optical lens in the focus state is A The effective focal length f of the optical lens in the close-up focusing state B Between: (f A -f B ) / f A <0.09. This setting can reduce the total length of the optical lens.

[0020] In some embodiments, the front lens group and the rear lens group both have positive optical power. This arrangement is beneficial for reducing the effective focal length of the optical lens, thereby reducing the overall length of the optical lens.

[0021] In some embodiments, the rear lens group includes, along the direction from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens has positive optical power, the second lens has negative optical power; one of the third lens and the fourth lens has positive optical power, and the other of the third lens and the fourth lens has negative optical power; and the fifth lens has negative optical power or positive optical power. This arrangement helps reduce aberrations of the optical lens.

[0022] In some embodiments, the second lens comprises a positive lens and a negative lens that are spaced apart from each other. This arrangement is beneficial for increasing the number of lens surfaces in the rear lens group, thereby facilitating correction of aberrations of the optical lens.

[0023] In some embodiments, the first deflection element is a reflector. This configuration can further reduce the weight of the first deflection element, and thus the weight of the optical lens. Furthermore, the medium surrounding the reflector is air, which has a lower refractive index than the prism, thereby reducing the overall length of the optical lens.

[0024] In some embodiments, the first turning element is a prism having a first light-entry surface and a first light-exit surface. The first light-entry surface is disposed toward the side where the at least one positive lens is located, and the first light-exit surface is disposed toward the side where the rear lens group is located. Among the at least one positive lens, the positive lens adjacent to the first turning element is spaced apart from the first light-entry surface. This arrangement increases the design freedom of the front lens group, thereby facilitating correction of optical lens aberrations.

[0025] In some embodiments, the optical lens further comprises a second deflection element, the second deflection element being disposed on the image side of the rear lens group, the second deflection element having a second reflective surface configured to reflect a light beam passing through the rear lens group toward one side of the optical axis of the rear lens group. This configuration can fold the optical path of the optical lens, thereby reducing the size of the optical lens along the optical axis of the rear lens group.

[0026] In some embodiments, the second turning element is a reflector. This configuration can further reduce the weight of the second turning element, thereby reducing the weight of the optical lens.

[0027] In some embodiments, the second deflection element is a prism having a second light-entry surface and a second light-exit surface. The second light-entry surface is positioned toward the side of the rear lens assembly, and the second light-exit surface is positioned to one side of the optical axis of the rear lens assembly. This configuration allows the prism to deflect stray light away from the photosensitive surface of the photosensitive element, thereby preventing stray light from directly striking the photosensitive surface and forming ghost images.

[0028] In a second aspect, an embodiment of the present application provides a camera module, comprising a photosensitive element and the optical lens described in the first aspect, wherein the photosensitive element is arranged on the image side of the optical lens.

[0029] The beneficial effects of the camera module in the embodiment of the present application are the same as the beneficial effects of the optical lens in the first aspect, and will not be repeated here.

[0030] In a third aspect, an embodiment of the present application provides an electronic device, comprising a housing and the camera module described in the second aspect, wherein the camera module is mounted on the housing.

[0031] The beneficial effects of the electronic device in the embodiment of the present application are the same as the beneficial effects of the optical lens in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1a is a schematic diagram of the definition of the image-side principal surface and image-side principal point of an optical system;

[0033] Figure 1b is a schematic diagram of the definition of the object principal plane and object principal point of the optical system;

[0034] Figure 1c is a schematic diagram of the definition of object distance and image distance of an optical system;

[0035] FIG2 is a schematic diagram of the back side of an electronic device (mobile phone) in some embodiments of the present application;

[0036] FIG3 is a cross-sectional view taken along line AA of the electronic device in FIG2 ;

[0037] FIG4 is a schematic diagram of the optical system of the camera module in the first embodiment of the present application;

[0038] FIG5 is a schematic diagram showing the principle of internal focusing and overall movement focusing of the optical lens in some embodiments of the present application;

[0039] FIG6a is a diagram of the optical lens in some embodiments of the present application. A / f g0 Relationship diagram with ξmin, ξ;

[0040] FIG6b is a diagram of the optical lens in some embodiments of the present application. A / f g0 Relationship diagram with ξmin, ξ, total length of optical lens / effective focal length;

[0041] FIG7 is a schematic diagram of an optical system of a camera module in a second embodiment of the present application;

[0042] FIG8 is a schematic diagram of an optical system of a camera module in a third embodiment of the present application;

[0043] FIG9 a is a diagram showing the optical system of the camera module in the fourth embodiment of the present application when the camera module is in focus on a distant scene;

[0044] FIG9 b is a diagram showing the optical system of the camera module in the fourth embodiment of the present application when it is in focus on a close-up view;

[0045] FIG9 c is a paraxial model diagram of the optical system of the camera module during the focusing process in the fourth embodiment of the present application;

[0046] FIG9 d is a simulation effect diagram of the optical system of the camera module in the fourth embodiment of the present application when the object distance is infinite;

[0047] FIG9e is a simulation effect diagram of the optical system of the camera module in the fourth embodiment of the present application when the object distance is 250 mm;

[0048] FIG9 f is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the fourth embodiment of the present application;

[0049] FIG9g is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the fourth embodiment of the present application;

[0050] FIG9h is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the fourth embodiment of the present application;

[0051] FIG9i is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the fourth embodiment of the present application;

[0052] FIG10 a is a schematic diagram of an optical system of a camera module in a fifth embodiment of the present application;

[0053] FIG10 b is a simulation effect diagram of the optical system of the camera module in the fifth embodiment of the present application when the object distance is infinite;

[0054] FIG10c is a simulation effect diagram of the optical system of the camera module in the fifth embodiment of the present application when the object distance is 250 mm;

[0055] FIG10 d is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the fifth embodiment of the present application;

[0056] FIG10e is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the fifth embodiment of the present application;

[0057] FIG10 f is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the fifth embodiment of the present application;

[0058] FIG10g is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the fifth embodiment of the present application;

[0059] FIG11 a is a schematic diagram of an optical system of a camera module in a sixth embodiment of the present application;

[0060] FIG11 b is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the sixth embodiment of the present application;

[0061] FIG11c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the sixth embodiment of the present application;

[0062] FIG11 d is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the sixth embodiment of the present application;

[0063] FIG11e is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the sixth embodiment of the present application;

[0064] FIG12 a is a schematic diagram of an optical system of a camera module in a seventh embodiment of the present application;

[0065] FIG12 b is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the seventh embodiment of the present application;

[0066] FIG12c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the seventh embodiment of the present application;

[0067] FIG12 d is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the seventh embodiment of the present application;

[0068] FIG12e is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the seventh embodiment of the present application;

[0069] FIG13a is a schematic diagram of the optical system of the camera module in the eighth embodiment of the present application;

[0070] FIG13 b is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the eighth embodiment of the present application;

[0071] FIG13 c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the eighth embodiment of the present application;

[0072] FIG13 d is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the eighth embodiment of the present application;

[0073] FIG13e is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the eighth embodiment of the present application;

[0074] FIG14 a is a schematic diagram of an optical system of a camera module in a ninth embodiment of the present application;

[0075] FIG14 b is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the ninth embodiment of the present application;

[0076] FIG14c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the ninth embodiment of the present application;

[0077] FIG14 d is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the ninth embodiment of the present application;

[0078] FIG14e is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the ninth embodiment of the present application;

[0079] FIG15 a is a schematic diagram of an optical system of a camera module in a tenth embodiment of the present application;

[0080] FIG15 b is a curve showing the relationship between the effective focal length and the distances between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the tenth embodiment of the present application;

[0081] FIG15 c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the tenth embodiment of the present application;

[0082] FIG15 d is a curve showing the relationship between the distance between the image-side principal surface of the rear lens group and the image plane, and the distance between the image-side principal surface of the front lens group and the object-side principal surface of the rear lens group during the focusing process of the optical lens in the tenth embodiment of the present application;

[0083] FIG15e is a curve showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the tenth embodiment of the present application. DETAILED DESCRIPTION

[0084] The following explains and describes the relevant technical terms involved in the embodiments of this application.

[0085] Focal power, expressed as the reciprocal of the image-side focal length (assuming the refractive index of air is approximately 1), characterizes the ability of an optical lens to deflect light. A lens or lens group with positive focal power has a positive focal length and has the effect of converging light. A lens or lens group with negative focal power has a negative focal length and has the effect of diverging light.

[0086] A positive lens, also known as a converging lens or convex lens, has the function of converging light. Convex lenses are divided into biconvex, plano-convex, and concave-convex (or positive meniscus) forms.

[0087] Negative lens, also known as diverging lens or concave lens, has a diverging effect on light. Concave lenses are divided into biconcave, plano-concave, convex-concave and other forms.

[0088] 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 passing through the centers of the optical elements of the optical lens. The optical axis also refers to the center line of a light beam (light column). When the light beam rotates around this axis, the optical properties do not change.

[0089] 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. The image-side focal length is the distance from the image-side principal plane to the image-side focal point. Similarly, the object-side focal length is the distance from the object-side principal plane to the object-side focal point. The focal length, effective focal length (EFL), and combined focal length described in the embodiments of this application all refer to the image-side focal length.

[0090] The principal plane of a lens (lens group), also called the principal surface, includes the image side principal surface and the object side principal surface. When parallel light is irradiated on the lens (lens group), it will be refracted and pass through the focus of the image side. After refraction, the light will be extended in the opposite direction and intersect with the incident light at a point. The plane perpendicular to the optical axis made through this point is the image side principal surface, and the intersection of the image side principal surface and the optical axis of the optical lens is the image side principal point. Similarly, light emitted from the object side focus becomes parallel light after refraction through the lens. The incident light is extended and intersects with the parallel light at a point. The plane perpendicular to the optical axis made through this point is the object side principal surface, and the intersection of the object side principal surface and the optical axis of the optical lens is the object side principal point.

[0091] As shown in Figure 1a, AB is an incident light ray parallel to the optical axis. After passing through an optical system (which can be a single lens or a lens system formed by multiple lenses), the outgoing light ray E'F' intersects the optical axis at F'. Based on the imaging theory of ideal optical systems, F' is the image point of the object point on the axis at infinity, known as the image-side focal point. Extending the incident light ray AB and the outgoing light ray E'F' in opposite directions will result in the two rays intersecting at a single point, designated Q'. A plane perpendicular to the optical axis is drawn through Q', intersecting the optical axis at point H'. H' is then called the image-side principal point, and the plane Q'H' is called the image-side principal plane. The distance from the principal point H' to the focal point F' is called the image-side focal length.

[0092] As shown in Figure 1b, F is called the object focus. Suppose the extension line of the incident light emitted from the focus F and the extension line of the corresponding outgoing light parallel to the optical axis intersect at point Q. A plane perpendicular to the optical axis is drawn through point Q and intersects the optical axis at point H. Point H is called the object principal point of the optical system, the QH plane is called the object principal plane, and the distance from the object principal point H to the object focus F is called the object focal length of the optical system.

[0093] The object distance, as shown in FIG1c , refers to the distance from the object plane to the object principal plane of the optical system, and is represented by the English letter U; wherein the optical system can be a single lens or a lens group formed by multiple lenses.

[0094] Image distance, as shown in FIG1c , refers to the distance from the image plane to the principal surface of the image side of the optical system, and is represented by the English letter V; wherein the optical system can be a single lens or a lens group formed by multiple lenses.

[0095] 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 to make the image of the optical lens clearest.

[0096] Internal focusing (IF) means that when the optical lens is focusing, a focusing lens group inside the optical lens moves to complete the focusing, and the total length (TTL) of the optical lens remains unchanged during focusing.

[0097] The focus stroke refers to the distance the focus lens group moves during the focusing process of an optical lens. For example, when an optical lens switches from focusing on a distant view to focusing on a close view, the distance the focus lens group moves along the optical axis is the focus stroke.

[0098] The image plane is located on the image side of all lenses in the optical lens, and is the position where the image is formed after the light passes through each lens in the optical lens in sequence.

[0099] An aperture is an entity that limits the light beam in an optical system. It can be the edge of a lens, a frame, or a specially designed screen with holes. The function of an aperture can be divided into two aspects: limiting the light beam or limiting the field of view (imaging range). The aperture that most limits the light beam in an optical system is called the aperture aperture, while the aperture that most limits the field of view (size) is called the field aperture.

[0100] 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 entrance pupil diameter is the diameter of the entrance pupil.

[0101] The relative aperture is the ratio of the entrance pupil diameter D to the image side focal length fˊ, denoted as RA, that is, RA = D / fˊ.

[0102] The F number (Fno or F / #) is the reciprocal of the relative aperture, that is, F = fˊ / D; the smaller the F number, the larger the aperture and the smaller the depth of field; conversely, the larger the F number, the smaller the aperture and the larger the depth of field.

[0103] 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.

[0104] ImgH (Image Hight) represents half of the diagonal length of the effective photosensitive area on the photosensitive element, that is, the image height.

[0105] The Abbe number (Abbe), also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0106] 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.

[0107] Spherical aberration is a wide-beam aberration. Concentric beams emitted from an on-axis point cease to be concentric after passing through an optical system. Light rays of varying 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 (the 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 diffuse spot. The radius of this diffuse spot is called vertical spherical aberration.

[0108] Coma is an aberration that occurs when a wide beam of light is viewed from an off-axis point. In an optical system with coma, the image of an off-axis object on the ideal image plane resembles a comet-like spot. Thin beams of light close to the principal ray intersect with it to form a bright spot, while beams of light of varying apertures farther from the principal ray form images of different circular rings. This imaging defect is therefore called coma.

[0109] Chromatic aberration (CA) occurs when optical materials have different refractive indices for different wavelengths of light. Consequently, light rays of different colors with the same aperture intersect the optical axis at different points after passing through an optical system. Light rays of different colors with different apertures also intersect the optical axis at different points. Consequently, at any position on the image plane, the image of an object point appears as a diffuse, colorful patch. The differences in image position and size between different colors are called chromatic aberration. There are two types of chromatic aberration: axial chromatic aberration and vertical chromatic aberration.

[0110] 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.

[0111] Vertical axis chromatic aberration: The same medium has different refractive indices for different colors of light. Therefore, for off-axis object points, the vertical axis magnification of different colors of light is also equal. This difference is called vertical axis chromatic aberration, also called magnification chromatic aberration.

[0112] Distortion, also known as distortion, is the difference between the intersection of the main light of different fields of view and the Gaussian image plane after passing through the optical lens and the ideal image height.

[0113] Field curvature describes the difference between the sharpest image point position of non-central field rays after passing through an optical lens system and the sharpest image point position on the optical axis in the central field of view. When field curvature exists, image points beyond the paraxial region on a Gaussian plane become blurred, and the image of a flat object becomes a curved surface of rotation, resulting in a lack of a perfect image of the object plane at the image plane.

[0114] Astigmatism: The meridional image point and sagittal image point of a thin beam do not coincide, and the axial distance separating the two is called astigmatism.

[0115] The meridional plane is the plane formed by the principal ray emitted from an object point located outside the principal axis of an optical system and the principal axis of the optical system. Rays lying within this meridional plane are collectively referred to as meridional beams. The point formed by a meridional beam is called a meridional image point. The image plane in which the meridional image point resides is called the meridional image plane.

[0116] The sagittal plane is the plane perpendicular to the meridional plane and passes through the principal ray emitted by an object point located outside the principal axis of an optical system. Rays lying within the sagittal plane are collectively referred to as sagittal beams. The point formed by a sagittal beam is called a sagittal image point. The image plane containing the sagittal image point is called the sagittal image plane.

[0117] The technical solutions in some embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0118] The present application provides an optical lens, a camera and an electronic device. The optical lens includes a front lens group and a rear lens group. The rear lens group is a focusing lens group. By reasonably allocating the optical focal length of the front lens group, the focusing accuracy of the optical lens can be improved.

[0119] The electronic device in the embodiment of the present application can be a mobile phone, a tablet computer, a laptop computer, a wearable device (such as a smart watch), and other electronic devices with a camera module. The electronic device in the embodiment of the present application is specifically introduced using a mobile phone as an example. Other types of electronic devices can be specifically set up with reference to the structure of the mobile phone embodiment, and will not be described one by one here.

[0120] Figure 2 is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of the present application, Figure 3 is a cross-sectional view taken along line AA of the electronic device in Figure 2, and Figure 4 is a schematic diagram of the optical system of the camera module 100 in the first embodiment of the present application. As shown in Figures 2 to 4, the electronic device includes a housing 200, a display screen 300, and a camera module 100, with the camera module 100 mounted on the housing 200.

[0121] In some embodiments, as shown in FIG3 , the housing 200 includes a middle frame 210 (also referred to as a front shell or front frame) and a back cover 220 (also referred to as a battery cover). The display screen 300 and the back cover 220 are mounted on opposite sides of the middle frame 210 . The back cover 220 and the middle frame 210 define a first accommodation space 230 . The camera module 100 is a rear-mounted camera module and is disposed in the first accommodation space 230 . The light inlet of the camera module 100 is positioned opposite to the camera window 221 provided on the back cover 220 to ensure that the camera module 100 can receive light emitted by the scene being photographed outside the housing 200 .

[0122] The camera window 221 can be directly provided on the back cover 220; as shown in FIG3 , the camera window 221 can also be provided on a camera decorative member 222. Specifically, the camera decorative member 222 is provided on the back cover 220 and has an opening on one side. A protective cover 223 is provided at the opening. The light-transmitting area of ​​the protective cover 223 serves as the camera window 221. As shown in FIG3 , the camera decorative member 222 can be an integral structure with the back cover 220, but the present invention is not limited thereto and the camera decorative member 222 can also be designed as a separate body from the back cover 220.

[0123] The display screen 300 and the middle frame 210 form a second accommodating space 240, in which electronic components such as the mainboard 400 are arranged. The mainboard 400 is connected to the display screen 300 and the camera module 100 through flexible circuit boards. A processor (not shown in the figure) is provided on the mainboard 400. The processor is used to obtain image data from the camera module 100, process the image data, and then transmit the processed signal to the display screen 300.

[0124] The middle frame 210 and the back cover 220 may be detachably connected or integrally formed, which is not specifically limited herein. The display screen 300 may be a liquid crystal display screen or an OLED (Organic Light-Emitting Diode) display screen, which is not specifically limited herein.

[0125] The camera module 100 in the embodiment of the present application can be installed in the upper left corner, upper middle, or upper right corner of the back of the electronic device, without specific limitation. In addition to being installed on the back of the electronic device and used as a rear camera module, the camera module 100 can also be used as a front camera module of the electronic device.

[0126] In some embodiments, as shown in Figures 3 and 4, the camera module 100 includes an optical lens 10, a photosensitive element 20, and a filter 30. The photosensitive element 20 is located on the image side of the optical lens 10. The filter 30 is located between the optical lens 10 and the photosensitive element 20, allowing light to pass through the optical lens 10 and illuminate the photosensitive surface of the photosensitive element 20.

[0127] Among them, the optical lens 10 mainly uses the refraction principle of the lens to form an image, that is, the light of the photographed scene passes through the optical lens 10, forming a clear image on the focal plane of the optical lens 10, and the image of the scene is recorded by the photosensitive element 20 located at the focal plane position. The photosensitive element 20 converts the optical image into an electrical signal and transmits it to the processor. The processor transmits the electrical signal to the display screen 300 to display the image of the photographed scene on the display screen 300.

[0128] The photosensitive element 20 (also known as an image sensor) is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface. When exposed to light, these diodes generate an electrical charge. The photosensitive element 20 can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), without further limitation.

[0129] The filter 30 is used to filter out unwanted wavelengths in the light, preventing the photosensitive element 20 from generating false colors or ripples, thereby improving its effective resolution and color reproduction. In some embodiments, as shown in FIG3 , the filter 30 is an infrared filter.

[0130] As shown in FIG3 , the filter 30 can be independently provided, or the filter 30 can be attached to the surface of one of the lenses or prisms of the optical lens 10 to achieve filtering, which is not specifically limited here.

[0131] In some embodiments, as shown in FIG. 3 , the camera module 100 includes a camera housing 40 , and the optical lens 10 , the photosensitive element 20 , and the filter 30 are disposed in the camera housing 40 .

[0132] As shown in Figure 4, the optical lens includes a front lens group G0 and a rear lens group G1 located on the image side of the front lens group G0; the front lens group G0 includes a first turning element 14 and a positive lens (positive lens L01 in Figure 4) located on the object side of the first turning element 14. The first turning element 14 has a first reflecting surface 141, which is used to reflect the light beam passing through the positive lens to the rear lens group G1. The rear lens group G1 is a focusing lens group and can move relative to the front lens group G0 along the optical axis of the rear lens group G1 (the second optical axis 12 shown in the figure). The effective focal length f of the front lens group G0 is g0 The effective focal length f of the optical lens in the focus state A Between: f A / f g0 <1.0.

[0133] Of course, the object side of the first turning element 14 is not limited to being provided with one positive lens, and may also be provided with two or more positive lenses, or a combination of a positive lens and a negative lens, which may be determined according to actual conditions.

[0134] The optical lens in the embodiment of the present application is provided with a reasonable effective focal length f of the optical lens. A The effective focal length f of the front lens group G0 g0 The ratio range, that is, f A / f g0<1.0, which can make the focus stroke compression ratio of the optical lens relatively small, that is, the minimum value of the focus stroke compression ratio of the optical lens is less than 1. In this way, the focus stroke of the optical lens can be relatively long when switching between the state of focusing on the near view and the state of focusing on the distant view. This can reduce the focus accuracy requirements of the focus motor, thereby reducing the design difficulty of the focus motor, and further helping to reduce the cost of the camera module.

[0135] The following is a detailed introduction to the concept of the focus stroke compression ratio of the optical lens:

[0136] As shown in Figure 5, Figure 5 shows a calculation principle diagram of the focus stroke compression ratio of the optical lens in some embodiments of the present application, wherein (2) in Figure 5 shows a state diagram of the optical lens in the embodiment of the present application when focusing on a distant view, and (3) in Figure 5 shows a state diagram of the optical lens in the embodiment of the present application when focusing on a close view. The optical lens in the embodiment of the present application adopts an internal focusing method for focusing.

[0137] As shown in (2) in Figure 5, d A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens in the embodiment of the present application is in the state of focusing on the distant view. As shown in (3) in Figure 5, d B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens in the embodiment of the present application is in a state of focusing on a close-up shot.

[0138] Among them, d A Satisfaction: d A =f g0 +f g1 -(f g0 .f g1 / f A );(1)

[0139] As shown in FIG5 (1), if the optical lens in FIG5 (2) adopts the overall moving focus mode, when the optical lens switches to the state of focusing close-up, the focusing stroke ΔV of the optical lens is A satisfy:

[0140] ΔV A =f A 2 / (U A0 ’ -f A );(2)

[0141] If the optical lens in (3) of FIG5 adopts the overall moving focusing method, when the optical lens switches to the state of focusing on the distant view, as shown in (4) of FIG5, the focusing stroke ΔV of the optical lens at this time is B satisfy:

[0142] ΔV B =f B 2 / (U B0 ’ -f B );(3)

[0143] Among them, f in formula (3) B is the effective focal length of the optical lens in the embodiment of the present application when focusing on the close-up view. A0 ’ The distance between the image side principal surface of the front lens group G0 and the object side principal surface of the rear lens group G1 is d A When the overall moving focus method is used, the object distance when the optical lens enters the close-up focus state (that is, the closest macro distance). U in formula (3) B0 ’ It means that when the distance between the image side principal surface of the front lens group G0 and the object side principal surface of the rear lens group G1 is d B When the overall moving focus method is used, the object distance (that is, the closest macro distance) when the optical lens enters the close-up focus state. A0 ’ ≠U B0 ’ , when the effective focal length difference of the optical lens is small, U A0 ’ with U B0 ’ Quite close.

[0144] As shown in (3) in FIG5 , when the optical lens enters the close-up focus state, the movement amount of the rear lens group G1 (i.e., the focus stroke) is ΔX, and the focus stroke compression ratio ξ of the rear lens group G1 is defined as follows:

[0145] ξ=|ΔV A / ΔX|;(4)

[0146] As shown in (2) in FIG5 , the distance V from the image plane IMA to the image side principal surface of the rear lens group G1 is A1 satisfy:

[0147] V A1 =[(d A -f g0 ).f g1 ] / [(d A -f g0 )-f g1 ]=f g1 -(f g1 .f A / f g0);(5)

[0148] As shown in (4) of FIG5 , the distance V from the image plane IMA to the image side principal surface of the rear lens group G1 is B1 satisfy:

[0149] V B1 =[(d B -f g0 ).f g1 ] / [(d B -f g0 )-f g1 ]=f g1 -(f g1 .f B / f g0 );(6)

[0150] According to the principle that the inner focus optical lens keeps the image plane unchanged during the focusing process from the distant view to the near view, the movement amount ΔX of the rear lens group G1 can be calculated as follows:

[0151] ΔX=V A1 –V B1 -ΔV B ;(7)

[0152] According to the above formulas (1) to (7), after approximate processing and simplified calculation, we can get:

[0153] The minimum value of the focus stroke compression ratio of the rear lens group G1 is ξmin=|1-(f A / f g0 ) 2 |;(8).

[0154] It can be seen from formula (8) that the minimum value ξmin of the focus stroke compression ratio of the rear lens group G1 is related to f A / f g0 There is a certain correlation between A / f g0 <1.0, f A / f g0 The smaller it is, the larger ξmin is, and the larger ξ is.

[0155] The greater the focus stroke compression ratio ξ of the rear lens group G1, the shorter the focus stroke of the rear lens group G1 when the optical lens switches between the long-range focus state and the close-range focus state. This facilitates shortening the designed maximum movement stroke (Stroke) of the focus motor of the rear lens group G1 (such as a voice coil motor VCM, a piezoelectric ceramic motor, a memory metal motor SMA, etc.). At the same time, the structure of such an optical lens is more compact, which is conducive to the miniaturization design of the optical lens. Conversely, the smaller the focus stroke compression ratio ξ of the rear lens group G1, the longer the focus stroke of the rear lens group G1 when the optical lens switches between the long-range focus state and the close-range focus state. This reduces the focus accuracy requirements of the focus motor, thereby reducing the design difficulty of the focus motor.

[0156] In some embodiments, f A / f g0 ≤0.38. This arrangement can make the minimum value ξmin of the focus stroke compression ratio of the rear lens group G1 larger, thereby shortening the focus stroke of the rear lens group G1. In this way, the optical lens can achieve a smaller object distance (that is, a smaller closest macro distance) when focusing on a close-up scene. Specifically, as shown in Figure 6a, Figure 6a shows the f of the optical lens in some embodiments of the present application. A / f g0 The relationship diagram with ξmin and ξ can be seen from Figure 6a that f A / f g0 When it is less than 0.38, the ξmin and ξ curves rise, and the left ends of the ξmin and ξ curves gradually approach 1. It can be seen that f A / f g0 When ξmin is less than 0.38, ξmin is large.

[0157] In some embodiments, 1>f A / f g0 ≥0.392. With this setting, the TTL / EF curve decreases, which can reduce the total length of the optical lens, thereby making the structure of the optical lens more compact, and thus facilitating the miniaturization of the optical lens and the camera module. As shown in FIG6b, FIG6b shows the f of the optical lens in some embodiments of the present application. A / f g0 The relationship between ξmin, ξ, and the total length (TTL) / effective focal length (EFL) of the optical lens is shown in Figure 6b. As can be seen from Figure 6b, the total length / effective focal length ratio curve of the optical lens changes with the change of f A / f g0 As the increase of A / f g0 When ≥0.392, the ratio of the total length of the optical lens to the effective focal length is small, and the total length of the optical lens is small.

[0158] In some embodiments, the minimum value ξmin of the focus stroke compression ratio of the rear lens group G1 satisfies: ξmin<1.0. This configuration can reduce ξmin and prevent ξ from being too large during the focusing process of the optical lens, thereby improving the focusing accuracy of the optical lens.

[0159] In some embodiments, ξmin≤0.846. This configuration can further reduce ξmin, preventing ξ from being too large during the focusing process of the optical lens, thereby further improving the focusing accuracy of the optical lens.

[0160] In some embodiments, 1>ξmin≥0.855. This configuration can make ξmin closer to 1, thereby shortening the focusing stroke of the rear lens group G1 while ensuring the focusing accuracy of the optical lens.

[0161] In some embodiments, the focus stroke compression ratio ξ of the rear lens group G1 satisfies the following: 0.74≤ξ≤1.15. This configuration allows ξ to be neither too large nor too small, thereby shortening the focus stroke of the rear lens group G1 while ensuring the focus accuracy of the optical lens.

[0162] In some embodiments, when the optical lens is focusing on a close-up shot, ξ satisfies: ξ ≥ 0.9. This configuration not only shortens the focusing distance when focusing on a close-up shot, but also ensures the focusing accuracy of the optical lens when focusing on a close-up shot, thereby improving the image quality and focusing efficiency of the camera when capturing close-up shots.

[0163] In some embodiments, the effective focal length f of the rear lens group G1 is g1 The effective focal length f of the optical lens in the focus state A Between: f A / f g1 ≥0.47. This setting can avoid f A / f g1 The value of is too small, thereby preventing the value of ξmin from being too small, and further reducing the focusing stroke of the optical lens.

[0164] Among them, f A / f g1 With f A / f g0 There is a certain correlation, A / f g1 The larger the f A / f g0 The smaller it is, the larger ξmin is.

[0165] In some embodiments, f A / f g1 ≤1.5. This setting can avoid fA / f g1 The value of is too large, which can avoid the value of ξmin being too large, thereby helping to ensure the focusing accuracy of the optical lens.

[0166] In some embodiments, the effective focal length f of the optical lens in the focus state is A The effective focal length f of the optical lens in the close-up focus state B Between: (f A -f B ) / f A <0.09. This setting can make the effective focal length f of the optical lens in the state of focusing on the distant view A The effective focal length f of the optical lens in the close-up focus state B The difference between them is small, which is beneficial to controlling the total length of the optical lens and making the total length of the optical lens smaller.

[0167] In some embodiments, as shown in FIG4 , both the front lens group G0 and the rear lens group G1 have positive optical power. By setting the optical power of the front lens group G0 and the rear lens group G1 to be positive, both the front lens group G0 and the rear lens group G1 can converge the light beam, which helps to reduce the effective focal length of the optical lens, thereby reducing the overall length of the optical lens, and further facilitating the miniaturization of the camera module 100.

[0168] Of course, in addition to both the front lens group G0 and the rear lens group G1 having positive optical power, the optical power of the front lens group G0 and the rear lens group G1 can also be set as: the front lens group G0 has positive optical power, and the rear lens group G1 has negative optical power.

[0169] In some embodiments, as shown in FIG4 , the rear lens group G1 includes, along the direction from the object side to the image side, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, and a fifth lens L15. The first lens L11 has positive focal power, the second lens L12 has negative focal power, the third lens L13 has positive focal power, the fourth lens L14 has negative focal power, and the fifth lens L15 has negative focal power.

[0170] By combining positive and negative focal powers of the lenses in the rear lens group G1, some aberrations can be offset, thereby reducing aberrations in the optical lens and ensuring the imaging quality of the optical lens. This also avoids having an excessive number of lenses in the rear lens group G1, thereby reducing the weight of the optical lens.

[0171] The rear lens group G1 is not limited to the above structure and may include five or more lenses. The third lens L13, the fourth lens L14, and the fifth lens L15 are not limited to the above optical power configurations; the third lens L13 may have negative optical power and the fourth lens L14 may have positive optical power. The fifth lens L15 is not limited to having negative optical power and may also have positive optical power.

[0172] In some embodiments, as shown in FIG4 , the first turning element 14 is a prism and has a first light incident surface 142 and a first light emitting surface 143 . The first light incident surface 142 is arranged toward the side where the positive lens L01 is located, and the first light emitting surface 143 is arranged toward the side where the rear lens group G1 is located.

[0173] The material of the prism can be glass, resin or other light-transmitting materials, which is not specifically limited here.

[0174] In some embodiments, as shown in FIG4 , the first turning element 14 is a right-angled prism, the first light incident surface 142 and the first light emitting surface 143 are respectively right-angled surfaces of the right-angled prism, and the first reflecting surface 141 is an inclined surface of the right-angled prism. In addition to a right-angled prism, the first turning element 14 can also be configured as a prism of other shapes.

[0175] In some embodiments, as shown in FIG4 , the angle between the first reflective surface 141 and the optical axis of the rear lens group G1 (the second optical axis 12 shown in the figure) is 45°. In this case, the optical axis of the positive lens L01 (the first optical axis 11 shown in the figure) is perpendicular to the optical axis of the rear lens group G1. However, this is not limiting, and the angle between the first reflective surface 141 and the optical axis of the rear lens group G1 can also be set to other angles according to actual needs.

[0176] In some embodiments, as shown in FIG. 4 , in at least one positive lens of the front lens group G0 , the positive lens adjacent to the prism is spaced apart from the first light incident surface 142 , that is, the positive lens L01 is spaced apart from the first light incident surface 142 .

[0177] Compared with designing the image side surface of the positive lens L01 to be a plane and attached to the first light incident surface 142, the positive lens L01 is set apart from the first light incident surface 142. This can increase the number of lens surfaces in the front lens group G0, increase the design freedom of the front lens group G0, and thus facilitate correcting the aberrations of the optical lens.

[0178] 4 , an air gap is provided between the positive lens L01 and the first light incident surface 142. Of course, the space between the positive lens and the first light incident surface 142 may be filled with other media besides air, such as nitrogen or a transparent adhesive layer, and is not specifically limited here.

[0179] In some embodiments, the optical lens further includes a second inflection element 15, which is disposed on the image side of the rear lens group G1. The second inflection element 15 has a second reflective surface 151, which is configured to reflect a light beam passing through the rear lens group G1 toward one side of the optical axis of the rear lens group G1. In this embodiment, the optical lens has three optical axes: the optical axis of the positive lens L01 on the object side of the first inflection element 14 (first optical axis 11), the optical axis of the rear lens group G1 (second optical axis 12), and the optical axis of the light beam emitted from the second inflection element 15 (third optical axis 13). The second optical axis 12 intersects the second optical axis 12 at the second reflective surface 151, and the photosensitive element 20 and the second inflection element 15 are arranged along the third optical axis 13.

[0180] By setting the second turning element 15, the optical path of the optical lens can be folded to reduce the size of the optical lens along the second optical axis 12, thereby reducing the space occupied by the optical lens inside the electronic device; at the same time, it is beneficial to control the size of the photosensitive surface (i.e., the image surface) of the photosensitive element 20 in the direction parallel to the second optical axis 12, and the photosensitive surface of the photosensitive element 20 can be designed to be larger, thereby reducing the space occupied by the photosensitive element in the thickness direction of the electronic device.

[0181] In some embodiments, as shown in FIG4 , the second turning element 15 is a prism and has a second light-entry surface 152 and a second light-exit surface 153. The second light-entry surface 152 is disposed toward the side where the rear lens group G1 is located, and the second light-exit surface 153 is located to one side of the optical axis of the rear lens group G1 (for example, as shown in FIG4 , the second light-exit surface 153 is located below the second optical axis 12). By configuring the second turning element 15 as a prism, the prism can deflect stray light away from the photosensitive surface of the photosensitive element 20, thereby preventing stray light from directly impinging on the photosensitive surface of the photosensitive element 20 and forming ghost images.

[0182] The material of the prism can be glass, resin or other light-transmitting materials, which is not specifically limited here.

[0183] In some embodiments, as shown in FIG4 , the second turning element 15 is a right-angled prism, the second light-incident surface 152 and the second light-exiting surface 153 are respectively right-angled surfaces of the right-angled prism, and the second reflecting surface 151 is an inclined surface of the right-angled prism. In addition to a right-angled prism, the second turning element 15 can also be configured as a prism of other shapes.

[0184] In some embodiments, as shown in FIG4 , the angle between the second reflective surface 151 and the second optical axis 12 is 45°, and the second optical axis 12 is perpendicular to the second optical axis 12. However, the present invention is not limited thereto, and the angle between the second reflective surface 151 and the second optical axis 12 can also be set to other angles according to actual needs.

[0185] Of course, the second turning element 15 may also be a reflector. By setting the second turning element 15 as a reflector, the mass of the reflector is lighter, thereby reducing the weight of the entire optical lens.

[0186] In some embodiments, as shown in FIG4 , the optical lens further includes a fixed barrel 51 , the rear lens group G1 is disposed in the fixed barrel 51 , and a spacer ring 52 is provided between any two adjacent lenses among the first lens L11 , the second lens L12 , the third lens L13 , the fourth lens L14 , and the fifth lens L15 .

[0187] FIG7 is a schematic diagram of the optical system of the camera module 100 according to the second embodiment of the present application. The main difference between the optical lens shown in FIG7 and the optical lens shown in FIG4 is that the optical lens in FIG7 does not include the second turning element 15. As a result, the optical lens has two optical axes, namely the second optical axis 12 and the first optical axis 11, and the photosensitive element 20 and the optical lens are arranged along the second optical axis 12.

[0188] As for the settings of other components shown in FIG. 7 , please refer to FIG. 4 for details, and no further details will be given here.

[0189] FIG8 is a schematic diagram of the optical system of the camera module in the third embodiment of the present application. The main difference between the optical lens shown in FIG8 and the optical lens shown in FIG7 is that the first turning element 14 in FIG7 is a prism, while the first turning element 14 in FIG8 is a reflector, as described below:

[0190] As shown in Figure 8 , the first turning element 14 is a reflector. Setting the first turning element 14 as a reflector makes it lighter, thereby reducing the weight of the entire optical lens. Furthermore, setting the first turning element 14 as a reflector and surrounding it with air, which has a lower refractive index than a prism, can reduce the overall length of the optical lens.

[0191] The reflector includes a mirror body and a reflective film covering one surface of the mirror body. The mirror body can be made of glass, but is not limited to this; other materials are also acceptable. The reflective film can be a metal film, such as silver, aluminum, or gold. The reflective film can also be made of a high-reflective dielectric film layer to achieve ultra-high reflectivity, or it can be a hybrid reflective film of metal and dielectric.

[0192] In some embodiments, as shown in FIG8 , the angle between the first reflective surface 141 and the second optical axis 12, and the angle between the first reflective surface 141 and the first optical axis 11 are both 45°. However, this is not limiting and the angle between the first reflective surface 141 and the second optical axis 12, and the angle between the first reflective surface 141 and the first optical axis 11 can also be set to other angles as needed.

[0193] Figure 9a shows the optical system of the camera module in the fourth embodiment of the present application when it is focused on a distant view, and Figure 9b shows the optical system of the camera module in the fourth embodiment of the present application when it is focused on a close view. The main difference between the optical lens shown in Figures 9a and 9b and the optical lens shown in Figure 7 is that the structure of the rear lens group G1 is different, as described below:

[0194] As shown in Figures 9a and 9b, the second lens L12 comprises a positive lens L122 and a negative lens L121, spaced apart from each other. The combined optical power of the positive lens L122 and the negative lens L121 is negative. This arrangement is equivalent to splitting the second lens L12 into the positive lens L122 and the negative lens L121. This increases the number of lens surfaces in the rear lens group G1, providing greater design freedom for the rear lens group G1 and facilitating correction of optical lens aberrations.

[0195] As shown in FIG. 9 a and FIG. 9 b , the negative lens L121 may be disposed between the first lens L11 and the positive lens L122 , but the present invention is not limited thereto. The negative lens L121 may be disposed between the positive lens L122 and the third lens L13 .

[0196] In some embodiments, as shown in Figures 9a and 9b, an air gap is provided between the positive lens L122 and the negative lens L121. Of course, the medium between the positive lens L122 and the negative lens L121 is not limited to air, and may also be other media, such as nitrogen, a glue layer, etc.

[0197] Figure 9c is a paraxial model diagram of the optical system of the camera module in the fourth embodiment of the present application during the focusing process. As shown in Figure 9c, when the optical lens switches from the state of focusing on the distant view to the state of focusing on the near view, the rear lens group G1 moves toward the direction close to the front lens group G0; when the optical lens switches from the state of focusing on the near view to the state of focusing on the distant view, the rear lens group G1 moves away from the front lens group G0.

[0198] The optical system of the camera module shown in FIG. 9 a and FIG. 9 b is described in detail below with reference to specific parameters and simulation results.

[0199] As shown in Table 4.1 and Table 4.2, Table 4.1 shows some main parameters of the optical system of the camera module in the fourth embodiment of the present application, and Table 4.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the fourth embodiment of the present application.

[0200] Table 4.1

[0201] The units of the parameters for curvature radius, thickness, and clear radius in the table are all in mm. OBJ represents the object plane. In the infinite object distance mode, the object distance is set to 1e+18 mm. In the macro mode, the object distance is set to 250 mm. STO represents the stop (STOP), which is located on the first light-emitting surface 143 of the first deflection element 14. It is used to limit the size of the clear aperture for the light beam to enter, thereby controlling the amount of light entering the optical system.

[0202] S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, S4 represents the first reflection surface 141 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S6 represents the object-side surface of first lens L11, and S7 represents the image-side surface of first lens L11. S8 represents the object-side surface of negative lens L121, and S9 represents the image-side surface of negative lens L121. S10 represents the object-side surface of positive lens L122, and S11 represents the image-side surface of positive lens L122. S12 represents the object-side surface of third lens L13, and S13 represents the image-side surface of third lens L13. S14 represents the object-side surface of fourth lens L14, and S15 represents the image-side surface of fourth lens L14. S16 denotes the object-side surface of fifth lens element L15, and S17 denotes the image-side surface of fifth lens element L15. IRCF denotes an infrared filter, S18 denotes the object-side surface of the filter, and S19 denotes the image-side surface of the filter. IMA denotes image plane IMAGE, which may be the photosensitive surface of a photosensitive element.

[0203] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the left, negative on the right, positive on the bottom, and negative on the top.

[0204] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the left, negative on the right, positive on the bottom, and negative on the top. A curvature radius of INF indicates that the surface corresponding to this parameter is a plane, with an infinite curvature radius.

[0205] The aperture thickness parameter "-2.656" represents the distance on the optical axis between the object-side surface S6 of the first lens element L11 and the aperture stop when the object distance is 1e+18 mm. The aperture thickness parameter "-1.017" represents the distance on the optical axis between the object-side surface S6 of the first lens element L11 and the aperture stop when the object distance is 250 mm. The thickness parameter "-1.936" of the fifth lens element L15 represents the distance on the optical axis between the image-side surface S17 of the fifth lens element L15 and the object-side surface S18 of the filter when the object distance is 1e+18 mm. The thickness parameter "-3.576" of the third lens element L13 represents the distance on the optical axis between the image-side surface S17 of the fifth lens element L15 and the object-side surface S18 of the filter when the object distance is 250 mm.

[0206] It can be seen from Table 4.1 that for the camera in the fourth embodiment of the present application, when the object distance of the optical lens is switched from infinity (long view) to macro 250mm (close view), the focusing stroke of the rear lens group G1 is 1.639mm.

[0207] In some embodiments, the aspheric surface in the optical lens can be defined using the following aspheric curve equation:

[0208] Where z is the relative distance between a point r from the optical axis on the aspheric surface and the tangent plane on the optical axis of the aspheric surface; r is the vertical distance between a point on the aspheric curve and the optical axis; c is the curvature; K is the cone coefficient; A i is the i-th order aspheric coefficient, see Table 4.2 for details.

[0209] Table 4.2

[0210] As shown in Table 4.3, Table 4.4 and Table 4.5, Table 4.3 shows other main parameters of the optical system of the camera module in the fourth embodiment of the present application, and Table 4.4 shows the focal length and ξ of the optical system of the camera module in the fourth embodiment of the present application when the object distance is infinite. min Table 4.5 shows the focal length and ξ value of the optical system of the camera module in the fourth embodiment of the present application when the object distance is 250 mm.

[0211] Table 4.3

[0212] Table 4.4 Object distance: INIFINITY

[0213] Table 4.5 Object distance: Macro = 250 mm

[0214] In Tables 4.3 to 4.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the negative lens L121, f4 is the focal length of the positive lens L122, f34 is the combined focal length of the negative lens L121 and the positive lens L122, f5 is the focal length of the third lens L13, f6 is the focal length of the fourth lens L14, f7 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 250mm).

[0215] Among them, from the data in Table 4.4 and Table 4.5, we can get: (f A -f B ) / f A =0.0183.

[0216] Figure 9d is a simulation effect diagram of the optical system of the camera module in the fourth embodiment of the present application when the object distance is infinite, and Figure 9e is a simulation effect diagram of the optical system of the camera module in the fourth embodiment of the present application when the object distance is 250mm. Figures 9d and 9e show the axial spherical aberration (LONGITUDINAL SPERICAL ABERRATION) curve, the astigmatism and field curvature curves of each image height, and the optical distortion (DISTORTION) curve of the optical lens. Among them, the axial spherical aberration curve includes spherical aberration curves corresponding to different bands of the system (including 656.2725nm, 587.5618nm, and 486.1327nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis is the deviation value along the optical axis, and the vertical axis is the normalized coordinate at the pupil. The values ​​shown in Figures 9d and 9e are both small, and the correction of the axial spherical aberration of the optical lens is better. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of light beams in different fields of view from the ideal imaging surface, where x is the sagittal direction light beam, y is the meridional direction light beam, its horizontal coordinate is the deviation value along the optical axis, and the vertical coordinate is the corresponding field of view. When a field of view value is too large, the image quality of that field of view is poor or there are high-order aberrations. As shown in Figures 9d and 9e, the field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation of the convergence point of light beams in different fields of view (actual image height) from the ideal image height. The deviation shown in Figures 9d and 9e is small, which can ensure that there is no obvious deformation of the picture. Therefore, the optical system of the camera module in the fourth embodiment of the present application achieves lower light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0217] Figure 9f is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the fourth embodiment of the present application; as shown in Figure 9f, during the process of the optical lens switching from the state of focusing on the near view to the state of focusing on the far view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0218] Figure 9g is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the fourth embodiment of the present application. As shown in Figure 9g, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0219] FIG9h is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the fourth embodiment of the present application. As shown in FIG9h , when the optical lens switches from focusing on a near-field image to focusing on a far-field image, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0220] Figure 9i is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the fourth embodiment of the present application. As shown in Figure 9i, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, the focus stroke compression ratio decreases as the object distance increases. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0221] Figure 10a is a schematic diagram of the optical system of the camera module according to the fifth embodiment of the present application. The main difference between the optical lens shown in Figure 10a and the optical lens shown in Figure 4 is that the composition of the rear lens group G1 is different. Specifically, as shown in Figure 10a, the second lens L12 includes a positive lens L122 and a negative lens L121, which are spaced apart. This helps increase the number of lens surfaces in the rear lens group G1, increasing the design freedom of the rear lens group G1, and thus facilitating the correction of optical lens aberrations.

[0222] The optical system of the camera module shown in FIG10 a is described in detail below with reference to specific parameters and simulation results.

[0223] As shown in Table 5.1 and Table 5.2, Table 5.1 shows some main parameters of the optical system of the camera module in the fifth embodiment of the present application, and Table 5.2 shows the aspheric coefficients of each surface of the optical system of the camera in the fifth embodiment of the present application.

[0224] Table 5.1

[0225] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM1 represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, S4 represents the first reflection surface 141 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S6 represents the object-side surface of first lens L11, and S7 represents the image-side surface of first lens L11. S8 represents the object-side surface of negative lens L121, and S9 represents the image-side surface of negative lens L121. S10 represents the object-side surface of positive lens L122, and S11 represents the image-side surface of positive lens L122. S12 represents the object-side surface of third lens L13, and S13 represents the image-side surface of third lens L13. S14 represents the object-side surface of fourth lens L14, and S15 represents the image-side surface of fourth lens L14. S16 denotes the object-side surface of the fifth lens element L15, and S17 denotes the image-side surface of the fifth lens element L15. PRISM2 denotes the second inflection element 15, which is a prism and has a light-reflecting function. S18 denotes the second light-incident surface 152 of the second inflection element 15, S19 denotes the second reflection surface 151 of the second inflection element 15, and S20 denotes the second light-exiting surface 153 of the second inflection element 15. IRCF denotes an infrared filter, S21 denotes the object-side surface of the filter, and S22 denotes the image-side surface of the filter. IMA denotes the image plane IMAGE, which can be the photosensitive surface of a photosensitive element.

[0226] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the left, negative on the right, positive on the bottom, and negative on the top.

[0227] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the left, negative on the right, positive on the bottom, and negative on the top. A curvature radius of INF indicates that the surface corresponding to this parameter is a plane, with an infinite curvature radius.

[0228] The aperture thickness parameter "-2.709" represents the distance on the optical axis between the object-side surface S6 of the first lens element L11 and the aperture STOP when the object distance is 1e+18 mm. The aperture thickness parameter "-1.017" represents the distance on the optical axis between the object-side surface S6 of the first lens element L11 and the aperture STOP when the object distance is 250 mm. The thickness parameter "-1.555" of the fifth lens element L15 represents the distance on the optical axis between the image-side surface S17 of the fifth lens element L15 and the object-side surface S18 of the filter when the object distance is 1e+18 mm. The thickness parameter "-3.248" of the third lens element L13 represents the distance on the optical axis between the image-side surface S17 of the fifth lens element L15 and the second light-incident surface 152 of the second inflection element 15 when the object distance is 250 mm.

[0229] It can be seen from Table 5.1 that for the camera in the fifth embodiment of the present application, when the object distance of the photographed scene is switched from infinity (long view) to macro 250mm (close view), the focusing stroke of the rear lens group G1 is 1.699mm.

[0230] Table 5.2

[0231] As shown in Table 5.3, Table 5.4 and Table 5.5, Table 5.3 shows other main parameters of the optical system of the camera module in the fifth embodiment of the present application, and Table 5.4 shows the focal length and ξ of the optical system of the camera module in the fifth embodiment of the present application when the object distance is infinite. min Table 5.5 shows the focal length and ξ value of the optical system of the camera module in the fifth embodiment of the present application when the object distance is 250 mm.

[0232] Table 5.3

[0233] Table 5.4 Object distance: INIFINITY

[0234] Table 5.5 Object distance: Macro = 250 mm

[0235] In Tables 5.3 to 5.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the negative lens L121, f4 is the focal length of the positive lens L122, f34 is the combined focal length of the negative lens L121 and the positive lens L122, f5 is the focal length of the third lens L13, f6 is the focal length of the fourth lens L14, f7 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots.g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 250mm).

[0236] Among them, from the data in Table 5.4 and Table 5.5, we can get: (f A -f B ) / f A =0.0192.

[0237] Figure 10b is a simulation effect diagram of the optical system of the camera module in the fifth embodiment of the present application when the object distance is infinite, and Figure 10c is a simulation effect diagram of the optical system of the camera module in the fifth embodiment of the present application when the object distance is 250mm. Figures 10b and 10c show the axial spherical aberration (LONGITUDINAL SPERICAL ABERRATION) curve, the astigmatism and field curvature curves of each image height, and the optical distortion (DISTORTION) curve of the optical lens. Among them, the axial spherical aberration curve includes spherical aberration curves corresponding to different bands of the system (including 656.2725nm, 587.5618nm, and 486.1327nm in the figure); its physical meaning is the deviation of the light of the corresponding wavelength emitted in the 0-degree field of view from the ideal image point after passing through the optical system; its horizontal axis is the deviation value along the optical axis, and the vertical axis is the normalized coordinate at the pupil. The values ​​shown in Figures 10b and 10c are both small, and the correction of the axial spherical aberration of the optical lens is better. The astigmatism field curvature diagram is used to illustrate the deviation of the convergence point of light beams in different fields of view from the ideal imaging surface, where x is the sagittal beam and y is the meridional beam. The horizontal coordinate is the deviation value along the optical axis, and the vertical coordinate is the corresponding field of view. When a field of view value is too large, the image quality of that field of view is poor or there are high-order aberrations. As shown in Figures 10b and 10c, the field curvature in both directions is small, and the system has a good depth of focus. The distortion diagram is used to characterize the relative deviation of the convergence point (actual image height) of light beams in different fields of view from the ideal image height. The deviation shown in Figures 10b and 10c is small, which can ensure that there is no obvious deformation of the picture. Therefore, the optical system of the camera module in the fifth embodiment of the present application achieves lower light aberration control and obtains clear image quality through reasonable surface shape and gap design.

[0238] Figure 10d is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the fifth embodiment of the present application. As shown in Figure 10d, when the optical lens switches from a state of focusing on a close-up view to a state of focusing on a distant view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, and the effective focal length of the optical lens continues to increase. The distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0239] Figure 10e is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the fifth embodiment of the present application. As shown in Figure 10e, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0240] Figure 10f is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distances between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the fifth embodiment of the present application. As shown in Figure 10f, when the optical lens switches from focusing on a near-field image to focusing on a distant field, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0241] Figure 10g is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the fifth embodiment of the present application. As shown in Figure 10g, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0242] Figure 11a is a schematic diagram of the optical system of the camera module in the sixth embodiment of the present application. The first and second turning elements in Figure 11a are both prisms, and the prisms are equivalently replaced by parallel flat plates in the optical path. The main difference between the optical lens shown in Figure 11a and the optical lens shown in Figure 4 is that the composition of the rear lens group G1 is different, as described below:

[0243] As shown in Figure 11a, the rear lens group G1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14 and a fifth lens L15 along the direction from the object side to the image side. The first lens L11 has positive focal power, and the second lens L12 has negative focal power; the third lens L13 has positive focal power, the fourth lens L14 has negative focal power, and the fifth lens L15 has negative focal power.

[0244] By combining positive and negative focal powers of the lenses in the rear lens group G1, some aberrations can be offset, thereby reducing aberrations in the optical lens and ensuring the imaging quality of the optical lens. This also avoids having an excessive number of lenses in the rear lens group G1, thereby reducing the weight of the optical lens.

[0245] In some embodiments, as shown in FIG11a , the second lens L12 includes a positive lens L122 and a negative lens L121 spaced apart from each other. This arrangement increases the number of lens surfaces in the rear lens group G1 and provides greater freedom in the design of the rear lens group G1 , thereby facilitating correction of optical lens aberrations.

[0246] The optical system of the camera module shown in FIG. 11 a is described in detail below with reference to specific parameters and simulation results.

[0247] As shown in Table 6.1 and Table 6.2, Table 6.1 shows some main parameters of the optical system of the camera module in the sixth embodiment of the present application, and Table 6.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the sixth embodiment of the present application.

[0248] Table 6.1

[0249] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM1 represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S6 represents the object-side surface of first lens L11, and S7 represents the image-side surface of first lens L11. S8 represents the object-side surface of negative lens L121, and S9 represents the image-side surface of negative lens L121. S10 represents the object-side surface of positive lens L122, and S11 represents the image-side surface of positive lens L122. S12 represents the object-side surface of third lens L13, and S13 represents the image-side surface of third lens L13. S14 represents the object-side surface of fourth lens L14, and S15 represents the image-side surface of fourth lens L14. S16 denotes the object-side surface of the fifth lens element L15, and S17 denotes the image-side surface of the fifth lens element L15. PRISM2 denotes the second inflection element 15, which is a prism and has a light-reflecting function. S18 denotes the second light-incident surface 152 of the second inflection element 15, and S19 denotes the second light-exiting surface 153 of the second inflection element 15. IRCF denotes an infrared filter, S20 denotes its object-side surface, and S21 denotes its image-side surface. IMA denotes the image plane IMAGE, which can be the photosensitive surface of a photosensitive element.

[0250] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the right and negative on the left.

[0251] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the right and negative on the left. A curvature radius of INF means that the surface corresponding to this parameter is a plane and the curvature radius is infinite.

[0252] Table 6.2

[0253] Table 6.3

[0254] Table 6.4 Object distance: INIFINITY

[0255] Table 6.5 Object distance: Macro = 59.385 mm

[0256] In Tables 6.3 to 6.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the negative lens L121, f4 is the focal length of the positive lens L122, f34 is the combined focal length of the negative lens L121 and the positive lens L122, f5 is the focal length of the third lens L13, f6 is the focal length of the fourth lens L14, f7 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 59.385 mm).

[0257] Among them, from the data in Table 6.4 and Table 6.5, we can get: (f A -f B ) / f A =0.087.

[0258] Figure 11b is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the sixth embodiment of the present application. As shown in Figure 11b, during the process of the optical lens switching from the state of focusing on the near-view to the state of focusing on the far-view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0259] Figure 11c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the sixth embodiment of the present application. As shown in Figure 11c, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0260] Figure 11d is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the sixth embodiment of the present application. As shown in Figure 11d, when the optical lens switches from focusing on a near-field image to focusing on a distant field, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0261] Figure 11e is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the sixth embodiment of the present application. As shown in Figure 11e, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0262] Figure 12a is a schematic diagram of the optical system of the camera module according to the seventh embodiment of the present application. The first deflection element in Figure 12a is a prism, and the prism is equivalently replaced by a parallel flat plate in the optical path. The main difference between the optical lens shown in Figure 12a and the optical lens shown in Figure 11a is that the optical lens in Figure 12a does not have the second deflection element 15, and the photosensitive element and optical lens are arranged along the second optical axis 12.

[0263] The optical system of the camera module shown in FIG12 a is described in detail below with reference to specific parameters and simulation results.

[0264] As shown in Table 7.1 and Table 7.2, Table 7.1 shows some main parameters of the optical system of the camera module in the seventh embodiment of the present application, and Table 7.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the seventh embodiment of the present application.

[0265] Table 7.1

[0266] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S7 represents the object-side surface of first lens L11, and S8 represents the image-side surface of first lens L11. S9 represents the object-side surface of second lens L12, and S10 represents the image-side surface of second lens L12. S11 represents the object-side surface of third lens L13, and S12 represents the image-side surface of third lens L13. S13 represents the object-side surface of fourth lens L14, and S14 represents the image-side surface of fourth lens L14. S15 represents the object-side surface of fifth lens element L15, and S16 represents the image-side surface of fifth lens element L15. IRCF represents an infrared filter, S17 represents the object-side surface of the filter, and S18 represents the image-side surface of the filter. IMA represents image plane IMAGE, which may be the photosensitive surface of a photosensitive element.

[0267] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the right and negative on the left.

[0268] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the right and negative on the left. A curvature radius of INF means that the surface corresponding to this parameter is a plane and the curvature radius is infinite.

[0269] Table 7.2

[0270] Table 7.3

[0271] Table 7.4 Object distance: INIFINITY

[0272] Table 7.5 Object distance: Macro = 172.928 mm

[0273] In Tables 7.3 to 7.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the second lens L12, f4 is the focal length of the third lens L13, f5 is the focal length of the fourth lens L14, f6 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 172.928 mm).

[0274] Among them, from the data in Table 7.4 and Table 7.5, we can get: (f A -f B ) / f A =0.0275.

[0275] Figure 12b is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the seventh embodiment of the present application. As shown in Figure 12b, during the process of the optical lens switching from the state of focusing on the near view to the state of focusing on the far view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0276] Figure 12c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the seventh embodiment of the present application. As shown in Figure 12c, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0277] FIG12d is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the seventh embodiment of the present application. As shown in FIG12d , when the optical lens switches from focusing on a near-field image to focusing on a far-field image, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0278] Figure 12e is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the seventh embodiment of the present application. As shown in Figure 12e, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0279] Figure 13a is a schematic diagram of the optical system of the camera module according to the eighth embodiment of the present application. The first deflection element in Figure 13a is a prism, and the prism is equivalently replaced by a parallel flat plate in the optical path. The main difference between the optical lens shown in Figure 13a and the optical lens shown in Figure 11a is that the optical lens in Figure 13a does not have the second deflection element 15, and the photosensitive element and optical lens are arranged along the second optical axis 12.

[0280] The optical system of the camera module shown in FIG13 a is described in detail below with reference to specific parameters and simulation results.

[0281] As shown in Table 8.1 and Table 8.2, Table 8.1 shows some main parameters of the optical system of the camera module in the eighth embodiment of the present application, and Table 8.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the eighth embodiment of the present application.

[0282] Table 8.1

[0283] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S7 represents the object-side surface of first lens L11, and S8 represents the image-side surface of first lens L11. S9 represents the object-side surface of second lens L12, and S10 represents the image-side surface of second lens L12. S11 represents the object-side surface of third lens L13, and S12 represents the image-side surface of third lens L13. S13 represents the object-side surface of fourth lens L14, and S14 represents the image-side surface of fourth lens L14. S15 represents the object-side surface of fifth lens element L15, and S16 represents the image-side surface of fifth lens element L15. IRCF represents an infrared filter, S17 represents the object-side surface of the filter, and S18 represents the image-side surface of the filter. IMA represents image plane IMAGE, which may be the photosensitive surface of a photosensitive element.

[0284] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the right and negative on the left.

[0285] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the right and negative on the left. A curvature radius of INF means that the surface corresponding to this parameter is a plane and the curvature radius is infinite.

[0286] Table 8.2

[0287] Table 8.3

[0288] Table 8.4 Object distance: INIFINITY

[0289] Table 8.5 Object distance: Macro = 174.04 mm

[0290] In Tables 8.3 to 8.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the second lens L12, f4 is the focal length of the third lens L13, f5 is the focal length of the fourth lens L14, f6 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 174.04 mm).

[0291] Among them, from the data in Table 8.4 and Table 8.5, we can get: (f A -f B) / f A =0.0269.

[0292] Figure 13b is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the eighth embodiment of the present application. As shown in Figure 13b, during the process of the optical lens switching from the state of focusing on the near view to the state of focusing on the far view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0293] Figure 13c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the eighth embodiment of the present application. As shown in Figure 13c, when the optical lens switches from the state of focusing on the near view to the state of focusing on the far view, as the object distance increases, the effective focal length of the optical lens continues to increase.

[0294] FIG13d is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the eighth embodiment of the present application. As shown in FIG13d , when the optical lens switches from focusing on a near-field image to focusing on a far-field image, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0295] Figure 13e is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the eighth embodiment of the present application. As shown in Figure 13e, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0296] Figure 14a is a schematic diagram of the optical system of the camera module according to the ninth embodiment of the present application. The first deflection element in Figure 14a is a prism, and the prism is equivalently replaced by a parallel flat plate in the optical path. The main difference between the optical lens shown in Figure 14a and the optical lens shown in Figure 11a is that the optical lens in Figure 14a does not have the second deflection element 15, and the photosensitive element 20 and the optical lens are arranged along the second optical axis 12.

[0297] The optical system of the camera module shown in FIG14 a is described in detail below with reference to specific parameters and simulation results.

[0298] As shown in Table 9.1 and Table 9.2, Table 9.1 shows some main parameters of the optical system of the camera module in the ninth embodiment of the present application, and Table 9.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the ninth embodiment of the present application.

[0299] Table 9.1

[0300] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S7 represents the object-side surface of first lens L11, and S8 represents the image-side surface of first lens L11. S9 represents the object-side surface of second lens L12, and S10 represents the image-side surface of second lens L12. S11 represents the object-side surface of third lens L13, and S12 represents the image-side surface of third lens L13. S13 represents the object-side surface of fourth lens L14, and S14 represents the image-side surface of fourth lens L14. S15 represents the object-side surface of fifth lens element L15, and S16 represents the image-side surface of fifth lens element L15. IRCF represents an infrared filter, S17 represents the object-side surface of the filter, and S18 represents the image-side surface of the filter. IMA represents image plane IMAGE, which may be the photosensitive surface of a photosensitive element.

[0301] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the right and negative on the left.

[0302] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the right and negative on the left. A curvature radius of INF means that the surface corresponding to this parameter is a plane and the curvature radius is infinite.

[0303] Table 9.2

[0304] Table 9.3

[0305] Table 9.4 Object distance: INIFINITY

[0306] Table 9.5 Object distance: Macro = 170.191 mm

[0307] In Tables 9.3 to 9.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the second lens L12, f4 is the focal length of the third lens L13, f5 is the focal length of the fourth lens L14, f6 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 170.191 mm).

[0308] Among them, from the data in Table 9.4 and Table 9.5, we can get: (f A -f B ) / f A =0.0286.

[0309] Figure 14b is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the ninth embodiment of the present application. As shown in Figure 14b, during the process of the optical lens switching from the state of focusing on the near-view to the state of focusing on the far-view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0310] Figure 14c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the ninth embodiment of the present application. As shown in Figure 14c, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0311] FIG14d is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the ninth embodiment of the present application. As shown in FIG14d , when the optical lens switches from focusing on a near-field image to focusing on a far-field image, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0312] Figure 14e is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the ninth embodiment of the present application. As shown in Figure 14e, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0313] Figure 15a is a schematic diagram of the optical system of the camera module according to the tenth embodiment of the present application. The first deflection element in Figure 15a is a prism, and the prism is equivalently replaced by a parallel flat plate in the optical path. The main difference between the optical lens shown in Figure 15a and the optical lens shown in Figure 11a is that the optical lens in Figure 15a does not have the second deflection element 15, and the photosensitive element and optical lens are arranged along the second optical axis 12.

[0314] The optical system of the camera module shown in FIG15 a is described in detail below with reference to specific parameters and simulation results.

[0315] As shown in Table 10.1 and Table 10.2, Table 10.1 shows some main parameters of the optical system of the camera module in the tenth embodiment of the present application, and Table 10.2 shows the aspheric coefficients of each surface of the optical system of the camera module in the tenth embodiment of the present application.

[0316] Table 10.1

[0317] In the table, S1 represents the object-side surface of positive lens L01, and S2 represents the image-side surface of positive lens L01. PRISM represents the first inflection element 14, which is a prism and has a light-reflecting function. S3 represents the first light-incident surface 142 of the first inflection element 14, and S5 represents the first light-exiting surface 143 of the first inflection element 14. S7 represents the object-side surface of first lens L11, and S8 represents the image-side surface of first lens L11. S9 represents the object-side surface of second lens L12, and S10 represents the image-side surface of second lens L12. S11 represents the object-side surface of third lens L13, and S12 represents the image-side surface of third lens L13. S13 represents the object-side surface of fourth lens L14, and S14 represents the image-side surface of fourth lens L14. S15 represents the object-side surface of fifth lens element L15, and S16 represents the image-side surface of fifth lens element L15. IRCF represents an infrared filter, S17 represents the object-side surface of the filter, and S18 represents the image-side surface of the filter. IMA represents image plane IMAGE, which may be the photosensitive surface of a photosensitive element.

[0318] The surface number S in the "Thickness" parameter series in the table n The corresponding value means the surface number S n Surface to surface number S n+1 The distance of the surface on the optical axis; the rules of the positive and negative signs in front of the thickness parameter are as follows: S n The vertex of the surface (the intersection with the optical axis) is the calculation origin, S n+1 The vertices of the surface are positive on the right and negative on the left.

[0319] The curvature radius in the table is the curvature radius of the surface with the corresponding surface number at the optical axis; the rules for the positive and negative signs in front of the curvature radius parameters are as follows: S n The vertex of the surface is the origin of the calculation. The center of the sphere is positive on the right and negative on the left. A curvature radius of INF means that the surface corresponding to this parameter is a plane and the curvature radius is infinite.

[0320] Table 10.2

[0321] Table 10.3

[0322] Table 10.4 Object distance: INIFINITY

[0323] Table 10.5 Object distance: Macro = 118.60 mm

[0324] In Tables 10.3 to 10.5, f1 is the focal length of the positive lens L01, f2 is the focal length of the first lens L11, f3 is the focal length of the second lens L12, f4 is the focal length of the third lens L13, f5 is the focal length of the fourth lens L14, f6 is the focal length of the fifth lens L15, and f A f is the effective focal length of the optical lens when it is focusing on the distant view; B f is the effective focal length of the optical lens when focusing on close-up shots. g0 is the effective focal length of the front lens group G0, f g1 is the effective focal length of the rear lens group G1. A d is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on the distant view (object distance is infinity); B It is the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 when the optical lens is in the state of focusing on close-up (object distance is 118.60 mm).

[0325] Among them, from the data in Table 10.4 and Table 10.5, we can get: (f A -f B ) / f A =0.045.

[0326] Figure 15b is a curve showing the relationship between the effective focal length and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the tenth embodiment of the present application. As shown in Figure 15b, during the process of the optical lens switching from the state of focusing on the near view to the state of focusing on the far view, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continues to increase, the effective focal length of the optical lens continues to increase, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 changes linearly with the effective focal length of the optical lens.

[0327] Figure 15c is a curve showing the relationship between the object distance and the effective focal length during the focusing process of the optical lens in the tenth embodiment of the present application. As shown in Figure 15c, when the optical lens switches from focusing on a close-up view to focusing on a distant view, the effective focal length of the optical lens continues to increase as the object distance increases.

[0328] FIG15d is a graph showing the relationship between the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA, and the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 during the focusing process of the optical lens in the tenth embodiment of the present application. As shown in FIG15d , when the optical lens switches from focusing on a near-field image to focusing on a far-field image, the distance between the image-side principal surface of the front lens group G0 and the object-side principal surface of the rear lens group G1 continuously increases, while the distance between the image-side principal surface of the rear lens group G1 and the image plane IMA continuously decreases, while the overall length of the optical lens remains unchanged.

[0329] Figure 15e is a graph showing the relationship between the focus stroke compression ratio and the object distance during the focusing process of the optical lens in the tenth embodiment of the present application. As shown in Figure 15e, when the optical lens switches from focusing on a close-up scene to focusing on a distant scene, as the object distance increases, the focus stroke compression ratio decreases continuously. The lower side of the focus stroke compression ratio and object distance relationship curve approaches a line infinitely. The intersection of this line and the vertical axis corresponds to the minimum value of the focus stroke compression ratio ξ. min .

[0330] The types of hatching in the drawings of this application are for the purpose of distinguishing different components and should not be understood as limiting the materials of the components. The drawings of this application are for the purpose of illustrating the structural composition and are not shown to scale with the actual product.

[0331] Although the description of this application will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to these embodiments. On the contrary, the purpose of introducing the application in conjunction with the embodiments is to cover other options or modifications that may be extended based on the claims of this application. In order to provide an in-depth understanding of this application, the following description will contain many specific details. This application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of this application, some specific details will be omitted in the description. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other unless there is a conflict.

[0332] In the embodiments of this application, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," or "fifth" may explicitly or implicitly include one or more of the features.

[0333] In the embodiments of this application, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0334] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "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 the present application, such as "up", "down", "left", "right", "inside", "outside", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. "Multiple" means at least two.

[0335] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in 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 "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0336] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical lens, characterized in that, It includes a front lens group (G0) and a rear lens group (G1) located on the image side of the front lens group (G0); The front lens group (G0) includes a first turning element (14) and at least one positive lens located on the object side of the first turning element (14). The first turning element (14) has a first reflecting surface (141) for reflecting the light beam passing through the at least one positive lens to the rear lens group (G1). The rear lens group (G1) is a focusing lens group and can move relative to the front lens group (G0) along the optical axis of the rear lens group (G1); The effective focal length f of the front lens group (G0) g0 and the effective focal length f of the optical lens in the far-focus state A satisfy: f A / f g0 < 1.0 2. The optical lens according to claim 1, characterized in that, f A / f g0 ≤0.

38.

3. The optical lens according to claim 1, wherein f A / f g0 ≥0.

392.

4. The optical lens according to any one of claims 1 to 3, wherein The minimum value ξmin of the focusing stroke compression ratio of the rear lens group (G1) = |1 - (f A / f g0 ) 2 |; ξmin satisfies: ξmin < 1.

0.

5. The optical lens according to claim 4, characterized in that, ξmin ≥ 0.

855.

6. The optical lens according to claim 4, characterized in that, ξmin ≤ 0.

846.

7. The optical lens according to any one of claims 1 to 6, wherein The focusing stroke compression ratio ξ of the rear lens group (G1) satisfies: 0.74 ≤ ξ ≤ 1.

15.

8. The optical lens according to claim 7, wherein When the optical lens is in the near-focus state, ξ satisfies: ξ ≥ 0.

9.

9. The optical lens according to any one of claims 1 to 8, wherein The effective focal length f of the rear lens group (G1) g1 and the effective focal length f of the optical lens in the far-focus state A satisfy the following relationship: f A / f g1 ≥0.47。 10. The optical lens according to claim 9, characterized in that f A / f g1 ≤1.

5.

11. The optical lens according to any one of claims 1 to 10, wherein The effective focal length f of the optical lens in the long-distance focusing state A and the effective focal length f of the optical lens in the short-distance focusing state B satisfy: (f A - f B ) / f A < 0.

09.

12. The optical lens according to any one of claims 1 to 11, wherein Both the front lens group (G0) and the rear lens group (G1) have positive optical powers.

13. The optical lens according to claim 12, wherein The rear lens group (G1) includes a first lens (L11), a second lens (L12), a third lens (L13), a fourth lens (L14), and a fifth lens (L15) in the direction from the object side to the image side. The first lens (L11) has a positive optical power, and the second lens (L12) has a negative optical power; one of the third lens (L13) and the fourth lens (L14) has a positive optical power, and the other of the third lens (L13) and the fourth lens (L14) has a negative optical power; the fifth lens (L15) has a negative optical power or a positive optical power.

14. The optical lens according to claim 13, wherein The second lens (L12) includes a positive lens and a negative lens arranged at intervals.

15. The optical lens according to any one of claims 1 to 14, wherein The first turning element (14) is a reflecting mirror; Alternatively, the first turning element (14) is a prism and has a first light incident surface (142) and a first light exit surface (143). The first light incident surface (142) is arranged facing the side where the at least one positive lens is located, and the first light exit surface (143) is arranged facing the side where the rear lens group (G1) is located; among the at least one positive lens, the positive lens adjacent to the first turning element (14) is arranged at intervals from the first light incident surface (142).

16. The optical lens according to any one of claims 1 to 15, characterized in that the optical lens further includes a second turning element (15), the second turning element (15) is disposed on the image side of the rear lens group (G1), the second turning element (15) has a second reflecting surface (151), and the second reflecting surface (151) is configured to reflect the light beam passing through the rear lens group (G1) to one side of the optical axis of the rear lens group (G1).

17. The optical lens according to claim 16, characterized in that the second turning element (15) is a reflecting mirror; alternatively, the second turning element (15) is a prism and has a second incident surface (152) and a second exit surface (153), the second incident surface (152) is disposed facing the side where the rear lens group (G1) is located, and the second exit surface (153) is located on one side of the optical axis of the rear lens group (G1).

18. A camera module, characterized in that, Comprising an image sensor (20) and the optical lens (10) according to any one of claims 1 to 17, the image sensor (20) is disposed on the image side of the optical lens (10).

19. An electronic device, characterized in that, Comprising a housing (200) and the camera module (100) according to claim 18, the camera module (100) is mounted on the housing (200).

Images