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 of a large volume of a camera module in related technologies. The optical lens comprises a first lens group, a first light path folding element and a second light path folding element arranged in a direction from an object side to an image side; the first lens group has positive refractive power; a gap is arranged between the first light path folding element and the second light path folding element; the first light path folding element is used for reflecting light passing through the first lens group at least once and shooting the light to the gap; the second light path folding element is used for reflecting light passing through the gap at least once and shooting the light out of the second light path folding element; a refracting part is arranged at the position of the gap; the refracting part has negative refractive power and is located on a light path of the light path folding element group. The application can be used on electronic equipment such as mobile phones.

Description

[0001] This application claims priority to Chinese patent application filed on December 5, 2024, with application number 202411793192.6 and entitled "Optical Lens, Camera Module and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

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

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

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

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

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

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

[0008] In a first aspect, embodiments of this application provide an optical lens, including a first lens group G1, a first optical path folding element, and a second optical path folding element arranged along the object-to-image direction. The first and second optical path folding elements constitute an optical path folding element group. The first lens group G1 has positive optical power. A gap exists between the first and second optical path folding elements. The first optical path folding element is used to reflect light passing through the first lens group G1 at least once and direct it toward the gap. The second optical path folding element is used to reflect light passing through the gap at least once and direct it out of the second optical path folding element. A refractive part is provided at the location of the gap. The refractive part has negative optical power and is located on the optical path of the optical path folding element group.

[0009] The optical lens in this embodiment, by setting an optical path folding element group, can reflect light multiple times, folding the optical path of the optical lens, thereby making the structure of the optical lens more compact and thus reducing the size of the camera module. Furthermore, placing the refractive part with negative optical power at the gap position avoids placing the refractive part too far forward in the optical path of the optical lens, ensuring that the refractive part is located near the center of the optical path. This optimizes the optical power distribution of the optical lens. When the total optical power of the optical lens is constant, the optical power borne by the refractive part is smaller. Thus, the refractive part has a weaker divergence of light passing through the first lens group G1, allowing the light to converge into an image without traveling a long distance in the optical lens, thereby shortening the overall length of the optical lens and further reducing the size of the camera module.

[0010] In addition, the refractive part has a smaller optical power and a weaker ability to diverge optically. Even if the position of the refractive part deviates to a certain extent, the change in the propagation direction of the light after passing through the refractive part is relatively small, which helps to reduce assembly sensitivity.

[0011] In some embodiments of the first aspect, the effective focal length f2 of the refractive section and the effective focal length f of the optical lens satisfy: |f2| / f≥0.7. This setting not only helps to further shorten the overall length of the optical lens, thereby reducing the size of the camera module, but also helps to further reduce assembly sensitivity.

[0012] In some embodiments of the first aspect, the effective focal length f2 of the refractive section and the effective focal length f of the optical lens satisfy: |f2| / f≤4. This configuration allows for better correction of optical lens aberrations while shortening the overall length of the optical lens.

[0013] In some embodiments of the first aspect, the total length (TTL) of the optical lens and the effective focal length (f) of the optical lens satisfy the condition: 0.8 ≤ TTL / f ≤ 1.5. This configuration allows for better correction of optical lens aberrations while shortening the total length of the optical lens.

[0014] In some embodiments of the first aspect, the length L1 of the first optical path folding element after unfolding and the effective focal length f of the optical lens satisfy: 0.3≤L1 / f≤0.7. This setting can further optimize the optical power distribution of the optical lens, making the optical power borne by the refractive part relatively small. This not only helps to further shorten the total length of the optical lens, but also helps to further reduce assembly sensitivity.

[0015] In some embodiments of the first aspect, the distance d between the image-side principal plane of the refractive section and the image-side principal plane of the first lens group G1, and the total length TTL of the optical lens satisfy: 0.3≤d / TTL≤0.7. This setting optimizes the optical power distribution of the optical lens, making the optical power borne by the refractive section relatively small. This not only helps to further shorten the total length of the optical lens, but also helps to further reduce assembly sensitivity.

[0016] In some embodiments of the first aspect, the distance d between the image-side principal plane of the refractive section and the image-side principal plane of the first lens group G1, and the total length TTL of the optical lens satisfy: d = TTL / 2. This arrangement minimizes the optical power borne by the refractive section, which not only helps to further shorten the total length of the optical lens, but also helps to further reduce assembly sensitivity.

[0017] In some embodiments of the first aspect, the refractive portion includes at least one of a first exit surface and a second incident surface, wherein the first exit surface is the exit surface of the first optical path folding element, the second incident surface is the incident surface of the second optical path folding element, and the gap is located between the first exit surface and the second incident surface. This arrangement eliminates the need to fabricate a separate refractive portion, which not only helps reduce the number of components in the optical lens but also facilitates the assembly of the optical lens.

[0018] In some embodiments of the first aspect, the refractive portion includes a second incident surface with negative optical power and a first exiting surface with zero optical power; the width d of the gap gap The effective focal length f of the optical lens satisfies: d gap ≤f / 10. This configuration results in a larger radius of curvature R2 of the second incident surface, leading to a smaller optical power handled by the refractive element, which in turn helps reduce the overall length of the optical lens and assembly sensitivity. In some embodiments of the first aspect, the refractive element includes a second incident surface with negative optical power, and the first exiting surface has zero optical power; the refractive index n of the medium within the gap... gapThe refractive index n is less than that of the second optical path folding element. This configuration results in a larger radius of curvature R2 of the second incident surface, a smaller optical power borne by the refractive part, which in turn helps to reduce the overall length of the optical lens and reduce assembly sensitivity.

[0019] In some embodiments of the first aspect, the gap is a gas gap, such as an air gap.

[0020] In some embodiments of the first aspect, the refractive portion includes a first exit surface and a second incident surface, both of which have optical power, and the combined optical power of the first exit surface and the second incident surface is negative. This arrangement increases the number of optically powerful surfaces in the optical path folding element group, increasing the design freedom and thus facilitating aberration correction of the optical lens.

[0021] In some embodiments of the first aspect, the optical powers of the first exit surface and the second incident surface are opposite. This arrangement allows for the cancellation of some aberrations, thereby helping to reduce aberrations in the optical lens.

[0022] In some embodiments of the first aspect, the first exit surface is bent toward the side away from the second incident surface, and the second incident surface is bent toward the side near the first exit surface; or, the first exit surface is bent toward the side near the second incident surface, and the second incident surface is bent toward the side away from the first exit surface. This arrangement helps to reduce the assembly sensitivity of the first optical path folding element and the second optical path folding element.

[0023] In some embodiments of the first aspect, the first exit surface is spherical and the second incident surface is aspherical; or, the first exit surface is aspherical and the second incident surface is spherical. This arrangement can correct the aberrations of the optical lens and reduce the assembly sensitivity of the first and second optical path folding elements to a certain extent.

[0024] In some embodiments of the first aspect, both the first exit surface and the second incident surface are spherical. This arrangement helps to further reduce the assembly sensitivity of the first optical path folding element and the second optical path folding element.

[0025] In some embodiments of the first aspect, both the first exit surface and the second incident surface are aspherical. This arrangement is beneficial for correcting aberrations in the optical lens.

[0026] In some embodiments of the first aspect, the refractive section includes a second lens group G2 disposed in the gap. The second lens group G2 has negative optical power and includes at least one lens. This configuration allows the second lens group G2 to contain one or more lenses depending on the actual situation, increasing design freedom and thus facilitating the correction of optical lens aberrations.

[0027] In some embodiments of the first aspect, the first lens group G1 is a focusing lens group, and when the optical lens is focusing, the first lens group G1 moves along the optical axis of the first lens group G1. Furthermore, the first lens group G1 is an image stabilization lens group, and when the optical lens is stabilizing, the first lens group G1 moves in a direction perpendicular to the optical axis of the first lens group G1. This arrangement allows the focusing motor and the image stabilization motor to be integrated, thereby making the structure of the camera module more compact and thus facilitating the reduction of the camera module's size.

[0028] In some embodiments of the first aspect, at the position of the optical lens's optical axis, the ΔMTF of the optical lens satisfies: ΔMTF < 0.1; at other positions besides the optical lens's optical axis, the ΔMTF of the optical lens satisfies: ΔMTF < 0.25; where ΔMTF = MTF0 - MTF1, MTF0 is the MTF value of the optical lens when it is stationary relative to the subject, at a spatial frequency of 1 / 4 of the Nyquist frequency of the image sensor; MTF1 is the MTF value of the optical lens when it is stabilizing, at a spatial frequency of 1 / 4 of the Nyquist frequency of the image sensor. This configuration ensures that the MTF loss of the optical lens is relatively small when the first lens group G1 is moving to perform image stabilization, thereby helping to guarantee the imaging quality of the optical lens.

[0029] In some embodiments of the first aspect, the first optical path folding element is a multi-reflection prism, and includes a first incident surface and a first surface arranged in a first direction, and a first exit surface and a second surface arranged in a second direction. The first incident surface is a total internal reflection surface, and the second surface is a reflective surface. Both the first exit surface and the second surface are inclined relative to the first direction. The first direction is parallel to the optical axis of the first lens group G1, and the second direction is perpendicular to the first direction. The second optical path folding element is a prism, and includes a third surface and a fourth surface arranged in the first direction, and a second incident surface and a second exit surface arranged in the second direction. The second incident surface faces the first exit surface, and at least one of the third and fourth surfaces is a total internal reflection surface. Both the second incident surface and the second exit surface are inclined relative to the first direction. This arrangement allows the dimensions of the photosensitive element and the optical lens to overlap in the first direction, avoiding additional height increases for the camera module due to the photosensitive element 200, thereby helping to reduce the height of the camera module.

[0030] In some embodiments of the first aspect, along the first direction, the fourth surface is located on the side of the second optical path folding element away from the first lens group G1; the angle between the first incident surface and the second surface is θ, the angle between the first exit surface and the first surface is 2θ, the angle between the second incident surface and the third surface is 2θ, and the angle between the second exit surface and the fourth surface is 2θ. This arrangement allows light to exit perpendicularly at the first and second exit surfaces and to be incident perpendicularly at the second incident surface, thereby enabling the light to propagate along a predetermined path in the first and second optical path folding elements, thus reducing light energy loss in the first and second optical path folding elements.

[0031] In some embodiments of the first aspect, along the first direction, the fourth surface is located on the side of the second optical path folding element away from the first lens group G1; the angle between the first incident surface and the second surface is θ, the angle between the first exit surface and the first surface is 2θ, the angle between the second incident surface and the third surface is 2θ, and the angle between the second exit surface and the third surface is 2θ. This arrangement allows light to exit perpendicularly at the first and second exit surfaces and to be incident perpendicularly at the second incident surface, thereby enabling the light to propagate along a predetermined path in the first and second optical path folding elements, thus reducing light energy loss in the first and second optical path folding elements.

[0032] In some embodiments of the first aspect, along the first direction, the fourth surface is located on the side of the second optical path folding element away from the first lens group G1; the angle between the first incident surface and the second surface is θ, the angle between the first exit surface and the first incident surface is 2θ, the angle between the second incident surface and the fourth surface is 2θ, and the angle between the second exit surface and the fourth surface is 2θ. This arrangement allows light to exit perpendicularly at the first and second exit surfaces and to be incident perpendicularly at the second incident surface, thereby enabling the light to propagate along a predetermined path in the first and second optical path folding elements, thus reducing light energy loss in the first and second optical path folding elements.

[0033] In some embodiments of the first aspect, the first optical path folding element is a multi-reflection prism, comprising a first incident surface and a first surface arranged along a first direction, and a first exit surface and a second surface arranged along a second direction. The first incident surface is a total internal reflection surface, and the second surface is a reflective surface. Both the first exit surface and the second surface are inclined relative to the first direction. The first direction is parallel to the optical axis of the first lens group G1, and the second direction is perpendicular to the first direction. The second optical path folding element is also a multi-reflection prism, comprising a second exit surface and a third surface arranged along the first direction, and a second incident surface and a fourth surface arranged along the second direction. The second exit surface is a total internal reflection surface, and the fourth surface is a reflective surface. Both the second incident surface and the fourth surface are inclined relative to the first direction, with the second incident surface facing the first exit surface. This configuration facilitates the installation of the photosensitive element.

[0034] In some embodiments of the first aspect, along the first direction, the second exit surface is located on the side of the second optical path folding element closer to the first lens group G1; the angle between the first incident surface and the second surface is θ, the angle between the first exit surface and the first surface is 2θ, the angle between the second incident surface and the second exit surface is 2θ, and the angle between the second exit surface and the fourth surface is θ. This arrangement helps to reduce the height of the camera module. At the same time, it allows light to exit perpendicularly at the first and second exit surfaces and to enter perpendicularly at the second incident surface, thereby allowing the light to propagate along a predetermined path in the first and second optical path folding elements, reducing light energy loss in the first and second optical path folding elements.

[0035] In some embodiments of the first aspect, along the first direction, the second exit surface is located on the side of the second optical path folding element away from the first lens group G1; the angle between the first incident surface and the second surface is θ, the angle between the first incident surface and the first exit surface is 2θ, the angle between the second incident surface and the second exit surface is 2θ, and the angle between the second exit surface and the fourth surface is θ. This arrangement allows light to exit perpendicularly at the first and second exit surfaces and to be incident perpendicularly at the second incident surface, thereby allowing the light to propagate along a predetermined path in the first and second optical path folding elements, reducing light energy loss in the first and second optical path folding elements.

[0036] In some embodiments of the first aspect, θ satisfies: 22°≤θ≤40°. This setting ensures that the light rays in the first and second optical path folding elements meet the condition of total internal reflection, while also preventing the included angle θ from being too large, which would result in a large height of the first and second optical path folding elements, thus helping to reduce the height of the optical lens.

[0037] In some embodiments of the first aspect, the optical lens satisfies the following condition: FOV ≤ 20°, where FOV is the field of view of the optical lens. This setting not only allows the optical lens to possess the characteristics of a telephoto lens, but also helps to improve the light uniformity of the optical lens, thereby improving the image quality of the optical lens.

[0038] In some embodiments of the first aspect, the optical lens satisfies: Fno ≤ 4.5, where Fno is the aperture number of the optical lens. This setting is beneficial for increasing the amount of light entering the optical lens, thereby improving the imaging quality of the optical lens in low-light environments.

[0039] In some embodiments of the first aspect, the optical lens satisfies: ImgH ≥ 3mm, where ImgH is the image height of the optical lens. This setting not only benefits the imaging resolution of the optical lens but also allows the optical lens to support a larger field of view.

[0040] In some embodiments of the first aspect, the optical lens further includes a third lens group G3, which has optical power and is located on the image side of the second optical path folding element. The third lens group G3 includes at least one lens. With this configuration, the third lens group G3 can adjust the incident angle and incident path of the incident light from the photosensitive element, thereby achieving the purpose of correcting field curvature.

[0041] In some embodiments of the first aspect, the effective focal length f3 of the third lens group G3 and the effective focal length f of the optical lens satisfy: |f3| / f≥0.8. This setting helps to shorten the overall length of the optical lens, thereby helping to reduce the size of the camera module.

[0042] In some embodiments of the first aspect, the optical lens is a telephoto lens.

[0043] Secondly, embodiments of this application provide a camera module, including a photosensitive element and the optical lens described in the first aspect, wherein the photosensitive element is disposed on the image side of the optical lens.

[0044] The beneficial effects of the camera module in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0045] Thirdly, embodiments of this application provide an electronic device, including a housing and the camera module described in the second aspect, wherein the camera module is mounted on the housing.

[0046] The beneficial effects of the electronic device in this embodiment are the same as those of the optical lens in the first aspect, and will not be repeated here.

[0047] In some embodiments of the third aspect, the electronic device is a mobile phone or a tablet computer. Attached Figure Description

[0048] Figure 1a A schematic diagram defining the image-side principal plane and image-side principal point of an optical system;

[0049] Figure 1b A schematic diagram defining the object-side principal plane and object-side principal point of an optical system;

[0050] Figure 1c A schematic diagram illustrating the definitions of object distance and image distance in an optical system;

[0051] Figure 2a This is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application;

[0052] Figure 2b for Figure 2a A cross-sectional view of the electronic equipment in the picture;

[0053] Figure 3a This is a schematic diagram of the camera module in the first embodiment of this application;

[0054] Figure 3b for Figure 3a The optical path diagram of the camera module is shown below;

[0055] Figure 4 for Figure 3a The schematic diagram of the camera module shown is shown.

[0056] Figure 5 This is a curve showing the functional relationship between d / f and |f2| / f for different focal length ratios k in the embodiments of this application.

[0057] Figure 6a This is a schematic diagram of the camera module in the second embodiment of this application;

[0058] Figure 6b for Figure 6a The optical path diagram of the camera module is shown below;

[0059] Figure 7 This is a schematic diagram of the camera module in the third embodiment of this application;

[0060] Figure 8 This is a simplified diagram of the camera module in the second embodiment of this application;

[0061] Figure 9 The width d in the embodiments of this application gap The relationship curve between the second incident surface radius of curvature R2 and the total length TTL of the optical lens;

[0062] Figure 10 The refractive index n of the medium within the gap in the embodiments of this application is... gap The curve relating the curvature radius R2 of the second incident surface;

[0063] Figure 11a This is a schematic diagram of the camera module in the fourth embodiment of this application;

[0064] Figure 11b for Figure 11a Optical path diagram of the camera module in the image;

[0065] Figure 12 This is a schematic diagram of the camera module in the fifth embodiment of this application;

[0066] Figure 13 for Figure 12 A size comparison diagram showing the optical lens and an optical lens without a refractive element (i.e., a comparison lens);

[0067] Figure 14afor Figure 12 The diagram shows the optical lens in focus on distant and close-up objects.

[0068] Figure 14b for Figure 14a The optical path diagrams shown are illustrated when the optical lens is focusing on distant and close-up objects.

[0069] Figure 15a This is a schematic diagram of the camera module in the sixth embodiment of this application;

[0070] Figure 15b for Figure 15a Optical path diagram of the camera module in the image;

[0071] Figure 16a This is a schematic diagram of the camera module in the seventh embodiment of this application;

[0072] Figure 16b for Figure 16a Optical path diagram of the camera module in the image;

[0073] Figure 17a This is a schematic diagram of the camera module in the eighth embodiment of this application;

[0074] Figure 17b for Figure 17a Optical path diagram of the camera module in the image;

[0075] Figure 18 This is a schematic diagram of the camera module in the ninth embodiment of this application;

[0076] Figure 19 This is a schematic diagram of the camera module in the tenth embodiment of this application;

[0077] Figure 20a This is a schematic diagram of the camera module in the eleventh embodiment of this application;

[0078] Figure 20b for Figure 20a Optical path diagram of the camera module in the image;

[0079] Figure 21a This is a schematic diagram of the camera module in the twelfth embodiment of this application;

[0080] Figure 21b for Figure 21a Optical path diagram of the camera module in the image;

[0081] Figure 22a This is a schematic diagram of the camera module in the thirteenth embodiment of this application;

[0082] Figure 22b for Figure 22a The optical path diagram of the camera module in the image. Detailed Implementation

[0083] The technical terms used in the embodiments of this application are explained and described below.

[0084] Optical power, expressed as the reciprocal of the image-side focal length (approximately assuming the refractive index of air is 1), characterizes the ability of an optical lens to deflect light. Lenses or lens groups with positive optical power have a positive focal length and converge light rays. Lenses or lens groups with negative optical power have a negative focal length and diverge light rays.

[0085] A positive lens, also known as a converging lens or convex lens, has the function of converging light rays. Convex lenses are classified into biconvex, plano-convex, and concave-convex (or positive meniscus) types.

[0086] A negative lens, also known as a diverging lens or concave lens, has the effect of diverging light. Concave lenses are classified into biconcave, plano-concave, and convex-concave types.

[0087] The optical axis refers to the axis of symmetry of an optical system. For example, the optical axis of an optical lens is the axis that passes through the center of each optical element of the optical lens. The optical axis also refers to the center line of a light beam (light column). The optical properties of the light beam do not change when it rotates around this axis.

[0088] Focal length is a measure of the convergence or divergence of light in an optical system. Focal length is divided into image-side focal length and object-side focal length. Image-side focal length is the distance from the image-side principal plane to the image-side focal point; similarly, object-side focal length is the distance from the object-side principal plane to the object-side focal point. In the embodiments of this application, the focal length, effective focal length (EFL), and combined focal length all refer to image-side focal length.

[0089] Effective focal length, such as Figure 1a As shown, this refers to the distance from the image-side principal plane to the image-side focal point of the optical system.

[0090] The principal plane of an optical system, also known as the principal plane, includes the image-side principal plane and the object-side principal plane. When parallel light shines on the optical system, it is refracted and passes through the focal point on the image side. After refraction, the light rays are extended backward and intersect the incident light rays at a point. The plane perpendicular to the optical axis through this point is the image-side principal plane, and the point where the image-side principal plane intersects the optical axis of the optical system is the image-side principal point. Similarly, light emitted from the object-side focal point becomes parallel light after being refracted by the optical system. The extended incident light rays intersect the parallel light rays at a point, and the plane perpendicular to the optical axis through this point is the object-side principal plane. The point where the object-side principal plane intersects the optical axis of the optical system is the object-side principal point.

[0091] The position of the principal plane of an optical system can be determined using optical tracing methods. For example, by tracing light rays parallel to the optical axis in the paraxial region of the optical system, the position of the principal plane and the focal length of the optical system can be calculated. Figure 1a As shown, AB is an incident ray parallel to the optical axis. After passing through the optical system, the outgoing ray E'F' intersects the optical axis at F'. According to the imaging theory of ideal optical systems, F' is the image point of the object point on the infinity axis, called the image-side focal point. If the incident ray AB and the outgoing ray E'F' are extended respectively, the two rays must intersect at a point, let this point be Q'. Draw a plane perpendicular to the optical axis through Q', intersecting the optical axis at point H'. Then H' is called the image-side principal point, the Q'H' plane is called the image-side principal plane, and the distance from the principal point H' to the focal point F' is called the image-side focal length (also called the effective focal length).

[0092] like Figure 1b As shown, F is called the object-side focal point. Let the extension of the incident ray emitted from the focal point F intersect the extension of the corresponding outgoing ray parallel to the optical axis at point Q. Draw a plane perpendicular to the optical axis through point Q and intersect the optical axis at point H. Point H is called the object-side principal point of the optical system, and the QH plane is called the object-side principal plane. The distance from the object-side principal point H to the object-side focal point F is called the object-side focal length of the optical system.

[0093] Object distance refers to the distance from the object plane to the object-side principal plane of the optical system, such as... Figure 1c As shown.

[0094] like Figure 1c As shown, image distance refers to the distance from the image plane to the principal plane of the image side in an optical system, such as... Figure 1c As shown.

[0095] The optical system mentioned above can be a single lens, one or more refractive surfaces with optical power, a lens group formed by multiple lenses, or a system formed by multiple lens groups (such as an optical lens).

[0096] Focusing specifically refers to adjusting the position of the lens group (i.e., the focusing lens group) in the optical lens to control the image distance, so that the image plane of the optical lens falls on the photosensitive element, thereby making the image of the optical lens as clear as possible.

[0097] Focusing travel refers to the distance the focusing lens group moves during the focusing process of an optical lens. For example, when an optical lens switches from focusing on a distant scene to focusing on a close-up scene, the distance the focusing lens group moves along the optical axis is the focusing travel.

[0098] The image plane is located on the image side of all lenses in an optical lens, where light rays pass through each lens in sequence to form an image.

[0099] MTF (Modulation Transfer Function) is the ratio of contrast on the image plane to contrast on the object plane; that is, MTF represents the transfer of contrast. MTF = M / m; M = (Imax - Imin) / (Imax + Imin); where Imax is the maximum light intensity on the object plane, and Imin is the minimum light intensity on the object plane; m = (imax - imin) / (imax + imin), where imax is the maximum light intensity on the image plane, and imin is the minimum light intensity on the image plane. MTF is a quantitative description of the sharpness of an optical lens, specifically a quantitative description of the sharpness of the image formed by the optical lens (including both resolution and sharpness). MTF values ​​satisfy 0 ≤ MTF ≤ 1.

[0100] An aperture stop is a physical object in an optical system that limits the beam of light. An aperture stop can be the edge of a lens, a frame, or a specially designed perforated screen. The function of an aperture stop can be twofold: to limit the beam of light or to limit the size of the field of view (imaging range). The aperture stop that limits the beam of light the most in an optical system is called the aperture stop, and the aperture stop that limits the field of view (size) the most is called the field stop.

[0101] The pupil is the image of the aperture stop. The conjugate image of the aperture stop through the optical system in front of the aperture stop is called the entrance pupil, or simply the entrance pupil. The diameter of the entrance pupil is the same as the diameter of the entrance pupil.

[0102] Relative aperture is the ratio of entrance pupil diameter D to image-side focal length fˊ, denoted as RA, i.e., RA = D / fˊ.

[0103] The F-number (Fno or F / #) is the reciprocal of the relative aperture, i.e., F = fˊ / D; the smaller the F-number, the larger the aperture and the shallower the depth of field; conversely, the larger the F-number, the smaller the aperture and the greater the depth of field.

[0104] 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.

[0105] ImgH (Image Height) represents half the diagonal length of the effective photosensitive area on the image sensor, also known as the image height.

[0106] The Abbe number, also known as the dispersion coefficient, is the ratio of the difference in refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0107] 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.

[0108] Spherical aberration is a wide beam aberration. When a concentric beam of light emitted from an on-axis point passes through an optical system, it is no longer concentric. Light rays at different incident heights intersect the optical axis at different positions after passing through the system, resulting in varying degrees of deviation from the paraxial image point (ideal image point). This deviation is called axial spherical aberration, or simply spherical aberration. Due to spherical aberration, the image point on the Gaussian image plane is no longer a point, but a circular spot of confusion. The radius of this spot of confusion is called transverse spherical aberration.

[0109] Coma is an aberration of wide beams at off-axis points. In an optical system with coma, the image point formed by an off-axis object point on the ideal image plane resembles a comet-shaped spot. The narrow beams close to the principal ray intersect the principal ray to form a bright spot, while the image points formed by beams of different apertures far from the principal ray are different rings far from the principal ray. Therefore, this imaging defect is called coma.

[0110] Chromatic aberration (CA) occurs because optical materials have different refractive indices for different wavelengths of light. Therefore, light rays of different colors passing through the same aperture will intersect the optical axis at different points. Similarly, light rays of different colors passing through different apertures will also intersect the optical axis at different points. This results in the image of an object point appearing as a colored diffuse spot at any image plane position. The difference in the imaging position and size between various colors of light is called chromatic aberration. There are two types of chromatic aberration: axial chromatic aberration and transverse chromatic aberration.

[0111] 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.

[0112] Transverse chromatic aberration: The same medium has different refractive indices for different colors of light; therefore, for an off-axis object point, the transverse magnification of different colors of light is not equal.

[0113] This difference is called vertical color difference, also known as magnification color difference.

[0114] Distortion, also known as distortion, is the difference between the height of the intersection point between the principal ray of different fields of view and the Gaussian image plane after passing through the optical lens and the ideal image height.

[0115] Field curvature is used to describe the difference along the optical axis between the position of the sharpest image point after rays from the off-center field of view pass through the optical lens group and the position of the sharpest image point in the central field of view. When field curvature exists, image points beyond the paraxial region on the Gaussian plane become blurred, and the image of a planar object becomes a curved surface of rotation, and a perfect image of the object plane cannot be obtained at the image plane.

[0116] Astigmatism is the axial distance between the meridional and sagittal image points of a narrow beam of light that do not coincide.

[0117] The meridional plane is the plane formed by the principal ray emitted from an object point outside the principal axis of an optical system and the principal axis of the optical system. Rays lying within the meridional plane are collectively called meridional beams. The point formed by a meridional beam is called a meridional image point. The image plane containing the meridional image point is called the meridional image plane.

[0118] The sagittal plane is a plane passing through the principal ray emitted from an object point located outside the principal axis of the optical system and perpendicular to the meridional plane. Rays lying within the sagittal plane are collectively called sagittal beams. The point formed by the sagittal beam is called the sagittal image point. The image plane containing the sagittal image point is called the sagittal image plane.

[0119] Currently, camera modules have become an indispensable key component in various electronic devices such as mobile phones and tablets. Through camera modules, people can easily capture wonderful moments and meet diverse photography needs such as daily life, work recording, and social sharing.

[0120] The camera module mainly consists of an optical lens and a photosensitive element. Its working principle is as follows: after light is focused by the optical lens, it shines on the photosensitive element. The photosensitive element converts the light signal into an electrical signal, and then the image signal processor performs a series of processing on the electrical signal. Finally, the processed digital image signal is output to the display screen or storage device of the electronic device to form the photos or videos we see.

[0121] With the development of electronic technology, electronic devices are trending towards thinner and lighter designs. This necessitates achieving high imaging performance in camera modules while maintaining a small size to save internal space. Therefore, designing optical lenses for camera modules to reduce their size has become an important issue in the industry.

[0122] One type of camera module optical lens in the related technology includes multiple lens groups arranged along the optical axis. This design results in a large axial dimension of the optical lens (especially the telephoto lens), which is not conducive to reducing the size of the camera module.

[0123] To address this, this application provides an optical lens, a camera module, and an electronic device. The optical lens includes a first lens group, a first optical path folding element, and a second optical path folding element along the object-side and image-side direction. A refractive section with negative optical power is provided at the gap between the first and second optical path folding elements, and the effective focal length f2 of the refractive section and the effective focal length f of the optical lens satisfy |f2| / f ≥ 0.7. By setting the optical path folding element, the optical path can be folded, shortening the axial dimension of the optical lens and facilitating the reduction of the camera module's size. Simultaneously, setting |f2| / f to be greater than or equal to 0.7 allows the refractive section to handle a smaller optical power, thereby reducing the overall length of the optical lens and further reducing the size of the camera module.

[0124] The electronic devices in this application embodiment can be mobile phones, tablets, laptops, wearable devices (such as smartwatches), or other electronic devices with camera modules. The following uses a mobile phone as an example to specifically describe the electronic devices in this application embodiment. Other types of electronic devices can be set up with reference to the structure of the mobile phone embodiment, and will not be described in detail here.

[0125] Figure 2a This is a schematic diagram of the back of an electronic device (mobile phone) in some embodiments of this application. Figure 2b for Figure 2a A cross-sectional view of the electronic device in the diagram. Figure 2b The image shows the installation location of the camera module 400 in the electronic device, but its specific installation structure is not shown.

[0126] like Figure 2a and Figure 2b As shown, the electronic device includes a housing 500, a display screen 600, and a camera module 400, both of which are mounted on the housing 500.

[0127] The display screen 620 can be a liquid crystal display screen, an OLED (Organic Light-Emitting Diode) display screen, a QLED (Quantum Dot Light-Emitting Diode) display screen, a Micro LED display screen, an electronic ink display screen, etc., without any specific limitations.

[0128] In some embodiments, such as Figure 2a and Figure 2b As shown, the housing 500 includes a mid-frame 510 (also called a front shell or front frame) and a rear cover 520 (also called a battery cover), with the mid-frame 510 connecting the display 600 and the rear cover 520.

[0129] The mid-frame 510 includes a bottom wall 511 and a side wall 512 disposed at the edge of the bottom wall 511. The edge of the display screen 600 is connected to the side wall 512, for example, by bonding. The display screen 600, the bottom wall 511, and the side wall 512 form a first receiving space 530, within which accessories 700 of the display screen 600 are disposed. For example, when the display screen 600 is an LCD display, the accessory 700 may be a backlight; or, when the display screen 600 is an OLED display, the accessory 700 may be a support film, a heat dissipation film, etc.

[0130] The edge of the back cover 520 is connected to the side wall 512 of the middle frame, for example, by snapping. The back cover 520, the bottom wall 511 of the middle frame, and the side wall 512 of the middle frame form a second receiving space 540, which is used to set up the camera module 400.

[0131] Of course, besides being installed in the second receiving space 540, the camera module 400 can also be installed in the first receiving space 530 to serve as a front-facing camera module for electronic devices. The mid-frame 510 is also not limited to... Figure 2b The structure shown can also be configured as other structures according to the actual situation, such as the middle frame 510 may not include the bottom wall 511.

[0132] like Figure 2b As shown, the camera module 400 includes an optical lens 100 and a photosensitive element 200. The photosensitive element 200 is located on the image side of the optical lens 100, and the optical lens 100 is disposed opposite to the camera window 521 on the rear cover 520.

[0133] The optical lens 100 is used for focusing and imaging; the photosensitive element 200 (also known as an image sensor) is used to convert light signals into electrical signals. The photosensitive element 200 can be a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) device, and no specific limitation is made here.

[0134] The working principle of the camera module 400 is as follows: the light of the subject enters the optical lens 100 through the camera window 521, forming a clear image on the focal plane of the optical lens 100, and the image of the subject is recorded by the photosensitive element 200 located at the focal plane. The photosensitive element 200 converts the optical image into an electrical signal and transmits it to the processor of the electronic device. The processor transmits the electrical signal to the display screen 600 to display the image of the subject on the display screen 600.

[0135] In some embodiments, such as Figure 2b As shown, the camera module 400 also includes a filter 300, located between the optical lens 100 and the photosensitive element 200. The filter 300 is used to filter out unwanted wavelengths of light, preventing the photosensitive element 200 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. For example, as... Figure 2b As shown, filter 300 can be an infrared filter.

[0136] Of course, the filter 300 is not limited to being placed between the optical lens 100 and the photosensitive element 200. The filter 300 can also be attached to the surface of one of the lenses or prisms of the optical lens 100 to achieve filtering.

[0137] Figure 3a This is a schematic diagram of the camera module 400 in the first embodiment of this application. Figure 3b for Figure 3a The optical path diagram of the camera module 400 is shown below. Figure 3a and Figure 3b As shown, the optical lens 100 of the camera module 400 includes a first lens group G1, a first optical path folding element 3 and a second optical path folding element 4 arranged along the object side to the image side. The first optical path folding element 3 and the second optical path folding element 4 constitute the optical path folding element group 2.

[0138] The first lens group G1 has positive optical power. However, the configuration of the first lens group G1 is not unique; in some embodiments, such as... Figure 3a As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 3a (From top to bottom) The four lenses are lens L11, lens L12, lens L13, and lens L14. Lenses L11, L12, and L14 are positive lenses, and lens L13 is a negative lens. Of course, the first lens group G1 is not limited to including four lenses; it can also include two or three lenses.

[0139] like Figure 3a and Figure 3b As shown, there is a gap 5 between the first optical path folding element 3 and the second optical path folding element 4. The first optical path folding element 3 is used to reflect the light passing through the first lens group G1 at least once (e.g., Figure 3a and Figure 3b (as shown three times), and is directed toward gap 5; the second optical path folding element 4 is used to reflect the light passing through gap 5 at least once (e.g., three times), and directs it toward gap 5; Figure 3a and Figure 3b (as shown twice), and emits the second optical path folding element 4.

[0140] A refractive part 6 is provided at the location of the gap 5. The refractive part 6 has negative optical power and is located on the optical path of the optical path folding element group 2. In some embodiments, such as Figure 3a and Figure 3b As shown, the refractive section 6 may include a second lens group G2, which is disposed in the gap 5. The second lens group G2 has negative optical power and includes at least one lens (e.g., lens L21, which is a negative lens). With this configuration, the second lens group G2 can be configured with one or more lenses according to actual conditions, increasing design freedom and thus facilitating the correction of aberrations in the optical lens 100.

[0141] In this embodiment, the optical lens 100, by incorporating an optical path folding element group 2, allows for multiple reflections of light, thus folding the optical path of the optical lens 100. This results in a more compact structure for the optical lens 100, which in turn helps to reduce the size of the camera module 400. Furthermore, placing the refractive part 6 with negative optical power at the gap 5 prevents it from being positioned too far forward in the optical path of the optical lens 100. Instead, the refractive part 6 is positioned closer to the center of the optical path, optimizing the optical power distribution of the optical lens 100. With a fixed total optical power, the refractive part 6 bears a smaller optical power, resulting in weaker divergence of light passing through the first lens group G1. This allows the light to converge without traveling a long distance within the optical lens 100, thus shortening the overall length of the optical lens 100 and further reducing the size of the camera module 400.

[0142] In addition, the optical power of the refractive part 6 is relatively small, and its optical divergence capability is weak. Even if the position of the refractive part 6 deviates to a certain extent, the change in the propagation direction of the light after passing through the refractive part 6 is relatively small, which helps to reduce assembly sensitivity.

[0143] In some embodiments, the effective focal length f2 of the refractive section 6 and the effective focal length f of the optical lens 100 satisfy the condition that |f2| / f ≥ 0.7. For example, |f2| / f can be 0.7, 0.8, 0.9, 1.2, 1.5, 1.8, 2.2, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, etc. This configuration can further optimize the optical power distribution of the optical lens 100, allowing the refractive section 6 to bear a smaller optical power (the optical power of the refractive section 6 is inversely proportional to the absolute value of the focal length; the larger |f2| / f is, the smaller the optical power of the refractive section 6). This not only helps to further shorten the overall length of the optical lens 100, thereby reducing the volume of the camera module 400, but also helps to further reduce assembly sensitivity.

[0144] Of course, the optical power borne by the refractive section 6 should not be too small. If the optical power borne by the refractive section 6 is too small, its ability to adjust the divergence of light passing through the first lens group G1 will be too weak, which is not conducive to the correction of aberrations in the optical lens 100. Therefore, in some embodiments, the effective focal length f2 of the refractive section 6 and the effective focal length f of the optical lens 100 satisfy: |f2| / f≤4. With this setting, while shortening the total length of the optical lens 100, the aberrations of the optical lens 100 can be better corrected, thereby improving the imaging quality of the optical lens 100.

[0145] In some embodiments, such as Figure 3a As shown, the length L1 of the first optical path folding element 3 after unfolding and the effective focal length f of the optical lens 100 satisfy the condition: 0.3 ≤ L1 / f ≤ 0.7. For example, L1 / f can be 0.3, 0.4, 0.5, 0.6, 0.7, etc. This arrangement avoids the refractive part 6 being positioned too far forward or too far back in the optical path of the optical lens 100, placing the refractive part 6 near the center of the optical path. This further optimizes the optical power distribution of the optical lens 100, making the optical power borne by the refractive part 6 relatively small. This not only helps to further shorten the overall length of the optical lens 100 but also helps to further reduce assembly sensitivity.

[0146] In some embodiments, such as Figure 3a As shown, the distance d between the image-side principal plane of the refractive part 6 and the image-side principal plane of the first lens group G1, and the total length TTL of the optical lens 100 satisfy the following condition: 0.3 ≤ d / TTL ≤ 0.7. For example, d / TTL can be 0.3, 0.4, 0.5, 0.6, 0.7, etc. This arrangement avoids the refractive part 6 being positioned too far forward or too far back in the optical path of the optical lens 100, placing it closer to the center of the optical path. This further optimizes the optical power distribution of the optical lens 100, making the optical power borne by the refractive part 6 relatively small. This not only helps to further shorten the total length of the optical lens 100 but also helps to further reduce assembly sensitivity.

[0147] In some embodiments, such as Figure 3a As shown, the distance d between the image-side principal plane of the refractive section 6 and the image-side principal plane of the first lens group G1, and the total length TTL of the optical lens 100 satisfy: d = TTL / 2, which means that the refractive section 6 is placed in the center. This arrangement minimizes the optical power borne by the refractive section 6 (i.e., maximizes |f2| / f), which not only helps to further shorten the total length of the optical lens 100, but also helps to further reduce assembly sensitivity.

[0148] Wherein, the total length TTL of the optical lens 100 refers to the total length from the surface of the optical lens 100 closest to the object side to the image plane after both the first optical path folding element 3 and the second optical path folding element 4 are unfolded. For example Figure 3a As shown, the total length TTL of the optical lens 100 is the sum of the lengths of line segments ap12, p12 p13, p13 p14, p14p22, p22p23, and p23b. Among them, the broken line p13 p15 is the optical axis of the first optical path folding element 3, and the broken line p21 p24 is the optical axis of the second optical path folding element 4.

[0149] The relationship between the position of the refractive part 6 and the magnitude of the optical power it provides will be explained in detail below.

[0150] like Figure 4 As shown, Figure 4 for Figure 3a The schematic diagram of the camera module 400 shown is shown below. Figure 4 The first lens group G1 and the refractive part 6 are simplified into a combination of two thin lenses.

[0151] Given that the telephoto ratio k = TTL / f.

[0152] 1 / f = 1 / f1 + 1 / f2 - d / f1f2; (1)

[0153] Transforming relation (1) yields: f1=f2f / (f2+fd); (2)

[0154] Based on the relationship between the total length TTL and focal length of the optical lens 100, the following can be derived: TTL-d=f(f1-d) / f1;(3)

[0155] Substituting relation (2) into relation (3), and after a series of algebraic operations, we can obtain:

[0156] f2 / f=(d / f) [(d / f)-k] / (1-k). (4)

[0157] Let x = d / f, y = |f²| / f, then, from relation (4), we can obtain: y = -1 / (1-k)(x 2 -kx), this is a quadratic function, and according to the properties of quadratic functions, we can obtain:

[0158] When x = d / f = k / 2, y reaches its maximum value, that is, when d = TTL / 2, |f2| / f reaches its maximum value, which means that the optical power borne by the refractive part 6 is the minimum.

[0159] In some embodiments, such as Figure 3a As shown, the total length TTL of the optical lens 100 and the effective focal length f of the optical lens 100 satisfy the following:

[0160] The focal length ratio is set to 0.8 ≤ TTL / f ≤ 1.5. For example, TTL / f can be 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, etc., where TTL / f is the focal length ratio k. This setting avoids the focal length ratio k being too large or too small. If the focal length ratio k is too small, the maximum value of |f²| / f is too small, resulting in a large optical power borne by the refractive part 6, which is not conducive to further reducing the overall length of the optical lens 100. If the focal length ratio k is too large, the maximum value of |f²| / f is too large, resulting in a small optical power borne by the refractive part 6, which is not conducive to the correction of aberrations in the optical lens 100. By setting the focal length ratio k to 0.8 ≤ k ≤ 1.5, the overall length of the optical lens 100 can be shortened while the aberrations of the optical lens 100 can be better corrected, thereby improving the imaging quality of the optical lens 100.

[0161] It should be noted that there is a close relationship between the telephoto ratio k and the maximum value of |f2| / f, such as... Figure 5 As shown, Figure 5 This is a curve showing the functional relationship between d / f and |f2| / f for the optical lens 100 in this embodiment when the focal ratio k is different. Figure 5 It can be seen that as the value of k increases, the maximum value of |f2| / f (i.e. the vertex of the function) increases continuously. That is, the larger the focal length ratio k is, the larger the maximum value of |f2| / f is. When k = 0.8, the maximum value of |f2| / f is greater than 0.7.

[0162] In some embodiments, such as Figure 3a As shown, the optical lens 100 satisfies the following condition: FOV ≤ 20°. For example, FOV can be 20°, 15°, 10°, etc. Here, FOV is the field of view of the optical lens 100.

[0163] This setting avoids an excessively large field of view (FOV) for the optical lens 100. If the FOV is too large, the light incident angle at the edges of the lens is larger, resulting in different propagation paths and intensities compared to the center. This can easily lead to inconsistent brightness between the image center and edges, and poor light uniformity. By setting the FOV to ≤ 20°, the optical lens 100 not only possesses the characteristics of a telephoto lens but also improves light uniformity, thereby enhancing the image quality.

[0164] In some embodiments, such as Figure 3aAs shown, the optical lens 100 satisfies the condition: Fno ≤ 4.5. For example, Fno can be 4.5, 4.0, 3.2, 2.8, etc., where Fno is the aperture number of the optical lens 100. This setting avoids the optical lens 100 having an excessively large aperture number Fno. If the aperture number Fno of the optical lens 100 is set too large, the amount of light entering the optical lens 100 will be insufficient. In low-light environments, this will cause the image image from the optical lens 100 to be underexposed and become dark, thus affecting the image quality of the optical lens 100. By setting the aperture number Fno of the optical lens 100 to Fno ≤ 4.5, it is beneficial to increase the amount of light entering the optical lens 100, thereby improving the image quality of the optical lens 100 in low-light environments.

[0165] In some embodiments, such as Figure 3a As shown, the optical lens 100 satisfies the following condition: ImgH ≥ 3mm. For example, ImgH can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, etc., where ImgH is the image height of the optical lens 100, representing half the diagonal length of the effective light-sensitive area on the photosensitive element 200. This setting avoids the image height of the optical lens 100 being too small, ensuring that more detail information of the subject can be captured on the image plane. This not only benefits the imaging resolution of the optical lens 100 but also allows the optical lens 100 to support a larger field of view.

[0166] In some embodiments, such as Figure 3a and Figure 3b As shown, the first lens group G1 is a focusing lens group. When the optical lens 100 is focusing, the first lens group G1 moves along the optical axis 11 of the first lens group G1 (for example, along...). Figure 3a (moving in the Z direction), and the first lens group G1 is an image-stabilizing lens group. When the optical lens 100 is in image stabilization mode, the first lens group G1 moves along a direction perpendicular to the optical axis 11 of the first lens group G1 (e.g., along the Z direction). Figure 3a (Y-axis movement in the middle). By setting the first lens group G1 as both the focusing lens group and the image stabilization lens group, the focusing motor and the image stabilization motor can be integrated, making the structure of the camera module 400 more compact and thus helping to reduce the size of the camera module.

[0167] The configuration of the optical path folding element group 2 is not unique. In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 3a and Figure 3bAs shown, the first optical path folding element 3 is a triple reflection prism, and includes a first incident surface 31 and a first surface 33 arranged in the first direction Z, and a first exit surface 32 and a second surface 34 arranged in the second direction Y. The first incident surface 31 and the first surface 33 are both total reflection surfaces, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z. The first direction Z is parallel to the optical axis 11 of the first lens group G1, and the second direction Y is perpendicular to the first direction Z.

[0168] The second optical path folding element 4 is a secondary reflection prism, and includes a third surface 43 and a fourth surface 44 arranged along the first direction Z, and a second incident surface 41 and a second exit surface 42 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32, and a gap 5 is formed between the second incident surface 41 and the first exit surface 32. The third surface 43 and the fourth surface 44 are both total reflection surfaces, and the second incident surface 41 and the second exit surface 42 are both inclined relative to the first direction Z.

[0169] like Figure 3a As shown, light rays passing through the first lens group G1 enter the first optical path folding element 3 through the first incident surface 31, and after being reflected three times by the second surface 34, the first incident surface 31, and the first surface 33, they exit the first optical path folding element 3 through the first exit surface 32. The light rays exiting the first optical path folding element 3 enter the gap 5 and pass through the refraction part 6, and then enter the second optical path folding element 4 through the second incident surface 41. The light rays entering the second optical path folding element 4 are reflected twice by the third surface 43 and the fourth surface 44, and then are directed towards the photosensitive element 200 through the second exit surface 42.

[0170] In this embodiment, since the second emission surface 42 is tilted relative to the first direction Z, the photosensitive element 200 is also tilted relative to the first direction Z. This allows the dimensions of the photosensitive element 200 and the optical lens 100 to overlap in the first direction Z, avoiding the photosensitive element 200 from adding extra height to the camera module 400 (i.e., the maximum size of the camera module 400 in the first direction Z). This helps to reduce the height of the camera module 400, and thus helps to reduce the thickness of the electronic device.

[0171] In some embodiments, such as Figure 3a As shown, a reflective film is deposited on the second surface 34. The reflective film can be a metal film or a low group delay dispersion (LDD) dielectric film. By designing the material and thickness of the film layer, the LDD dielectric film controls the group delay dispersion at a low level when light of different frequencies passes through the film. This means that the various frequency components in the light pulse can propagate at relatively similar speeds, thereby reducing pulse broadening and distortion.

[0172] In some embodiments, such as Figure 3a As shown, along the first direction Z, the fourth surface 44 is located on the side of the second optical path folding element 4 away from the first lens group G1; the angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first surface 33 is 2θ, the angle between the second incident surface 41 and the third surface 43 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is 2θ. With this arrangement, light can exit perpendicularly at the first exit surface 32 and the second exit surface 42, and enter perpendicularly at the second incident surface 41, thus allowing the light to propagate along a predetermined path in the first optical path folding element 3 and the second optical path folding element 4, thereby reducing light energy loss in the first optical path folding element 3 and the second optical path folding element 4.

[0173] In some embodiments, such as Figure 3a As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°. For example, θ can be 22°, 25°, 28°, 30°, 32°, 35°, 38°, 40°, etc. By setting the angle θ to 22°≤θ≤40°, the light rays in the first optical path folding element 3 and the second optical path folding element 4 can meet the condition of total internal reflection, while avoiding an excessively large angle θ that would result in a large height of the first optical path folding element 3 and the second optical path folding element 4. This helps to reduce the height of the optical lens 100 and compress the volume of the camera module.

[0174] Of course, in addition to both being multiple reflection prisms, the first optical path folding element 3 and the second optical path folding element 4 can also be single reflection prisms, for example, both the first optical path folding element 3 and the second optical path folding element 4 can be isosceles right angle prisms.

[0175] Figure 6a This is a schematic diagram of the camera module 400 in the second embodiment of this application. Figure 6b for Figure 6a The optical path diagram of the camera module 400 is shown. Figure 6a , Figure 6b The camera module 400 and Figure 3a , Figure 3b The main difference between the camera module 400 and the other two is: Figure 6a , Figure 6b The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different; Figure 6a , Figure 6b The camera module 400 provides parameters such as the radius of curvature, thickness, refractive index, Abbe number, and aspheric coefficient of each optical element, as shown below:

[0176] In some embodiments, such as Figure 6a and Figure 6b As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 6a (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0177] In some embodiments, such as Figure 6a and Figure 6b As shown, the effective focal length f of the optical lens 100 is 25.8mm, and the aperture number Fno is 3.07.

[0178] The following section discusses specific parameters. Figure 6a as well as Figure 6b The optical lens 100 shown will be described in detail.

[0179] As shown in Tables 1.1 and 1.2, Table 1.1 shows the main parameters of the optical lens 100 in the second embodiment of this application, and Table 1.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the second embodiment of this application.

[0180] Table 1.1

[0181]

[0182]

[0183] The units for the radius of curvature and thickness parameters in Table 1.1 are all mm.

[0184] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; and S9 represents the image-side surface of lens L14.

[0185] PRISM1 represents the first optical path folding element 3, which is a triple-reflection prism with light folding function. S9 represents the first incident surface 31 of the first optical path folding element 3. S10 represents the second surface 34 of the first optical path folding element 3. S11 represents the first incident surface 31 of the first optical path folding element 3. S12 represents the first surface 33 of the first optical path folding element 3. S13 represents the first exit surface 32 of the first optical path folding element 3.

[0186] S14 represents the object-side surface of lens L21, and S15 represents the image-side surface of lens L21.

[0187] PRISM2 represents the second optical path folding element 4, which is a secondary reflection prism with light refracting function. S16 represents the second incident surface 41 of the second optical path folding element 4, S17 represents the third surface 43 of the second optical path folding element 4, S18 represents the fourth surface 44 of the second optical path folding element 4, and S19 represents the second exit surface 42 of the second optical path folding element 4.

[0188] IRCF represents an infrared filter, S20 is the object-side surface of the filter, and S21 is the image-side surface of the filter.

[0189] In the table, the surface number S is in the "Thickness" parameter column. n The corresponding numerical value means surface number S n Surface to surface number S n+1 The distance of the surface along the optical axis; the rule for the sign of the thickness parameter is as follows: Starting with S... n The vertex of the surface (the intersection with the optical axis) is the origin for calculation, S n+1 The vertex of the surface is positive when it is on the right, negative when it is on the left, positive when it is at the bottom, and negative when it is at the top.

[0190] The radii of curvature in the table are the radii of curvature of the corresponding surface number at the optical axis; the rules for the sign of the radii of curvature parameter are as follows: Starting with S... n The vertex of the surface is the origin of the calculation. Positive values ​​are those with the center of the sphere on the right, negative values ​​are those with the center of the sphere on the left, positive values ​​are those at the bottom, and negative values ​​are those at the top. A radius of curvature of 1.00E+18 indicates that the surface corresponding to this parameter is a plane with an infinite radius of curvature.

[0191] It should be noted that the rules for the plus or minus signs before the thickness parameters and the radius of curvature parameters in this table, as well as the surface number S in the "Thickness" parameter column of the table, are as follows. n The meanings of the corresponding numerical values ​​and thicknesses also apply to the tables below.

[0192] In some embodiments, the aspherical surfaces in the optical lens 100 can be defined using the following aspherical curve equation:

[0193]

[0194] Where z is the relative distance between a point on the aspherical surface at a distance r from the optical axis and the tangent plane at the intersection point on the optical axis; r is the perpendicular distance between a point on the aspherical curve and the optical axis; c is the curvature; K is the cone coefficient; A i For the i-th order aspherical coefficients, see Table 1.2 for details.

[0195] Table 1.2

[0196]

[0197]

[0198] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 3a , Figure 3b The camera module 400 shown is configured as described above, and will not be described in detail here.

[0199] Figure 7 This is a schematic diagram of the camera module 400 in the third embodiment of this application. Figure 7 The camera module 400 and Figure 3a , Figure 3b The main difference between the camera module 400 and the other module is that the structure of the refractive part 6 is different. Figure 7 In the first method, the refractive part 6 is fabricated on the optical path folding element; the position of the second exit surface 42 of the second optical path folding element 4 is different. Figure 7 The second exit surface 42 is located on the side of the second optical path folding element 4 closest to the first lens group G1, as described below:

[0200] In some embodiments, such as Figure 7 As shown, the refractive part 6 includes at least one of a first exit surface 32 and a second incident surface 41. The first exit surface 32 is the exit surface of the first optical path folding element 3, and the second incident surface 41 is the incident surface of the second optical path folding element 4. The gap 5 is located between the first exit surface 32 and the second incident surface 41.

[0201] Since the refractive part 6 includes at least one of the first exit surface 32 and the second incident surface 41, the refractive part 6 and the optical path folding element are integrated into one structure. This eliminates the need to manufacture the refractive part 6 separately, which not only helps to reduce the number of parts of the optical lens 100, but also facilitates the assembly of the optical lens 100.

[0202] In some embodiments, such as Figure 7 As shown, the refractive part 6 includes a second incident surface 41 with a negative optical power, and a first exit surface 32 that is a plane, meaning the optical power of the first exit surface 32 is 0.

[0203] In some embodiments, such as Figure 7 As shown, the width d of gap 5 gap The effective focal length f of the optical lens 100 satisfies:

[0204] d gap ≤f / 10.

[0205] This setting avoids the width d of gap 5. gap Too large, according to width d gapThe coupling relationship between the second incident surface 41 and the radius of curvature R2, if the width d gap If the radius of curvature R2 of the second incident surface 41 is too large, the absolute value of the effective focal length |f2| of the refraction part 6 will decrease, and the optical power borne by the refraction part 6 will increase. This is not conducive to reducing the overall length of the optical lens 100 and reducing assembly sensitivity. By increasing the width d of the gap 5... gap Set to d gap ≤f / 10, so that the width d of the gap 5 can be made gap The smaller radius of curvature R2 of the second incident surface 41 results in a larger optical power of the refractive part 6, which in turn helps to reduce the overall length of the optical lens 100 and reduce assembly sensitivity.

[0206] Among them, such as Figure 7 As shown, the radius of curvature R2 of the second incident surface 41 can be the radius of curvature of the second incident surface 41 at the optical axis position of the second optical path folding element 4. The second incident surface 41 can be a sphere or an aspherical surface, which is not specifically limited here; the width d of the gap 5 gap The gap 5 can be the width of the optical axis position of the second optical path folding element 4.

[0207] In some embodiments, such as Figure 7 As shown, the refractive index n of the medium within gap 5 gap It is less than the refractive index n of the second optical path folding element 4.

[0208] This configuration avoids the refractive index n of the medium within gap 5. gap If it is too large, based on the refractive index n of the medium within gap 5... gap The coupling relationship between the second incident surface 41 and the radius of curvature R2, if the refractive index n of the medium within the gap 5 is... gap If the radius of curvature R2 of the second incident surface 41 is too large, the optical power borne by the refractive part 6 will become smaller, which is not conducive to reducing the overall length of the optical lens 100 and reducing assembly sensitivity. By adjusting the refractive index n of the medium within the gap 5... gap The refractive index n is set to be smaller than that of the second optical path folding element 4. This makes the refractive index of the medium in the gap 5 smaller, thereby making the radius of curvature R2 of the second incident surface 41 larger and the optical power borne by the refractive part 6 smaller. This helps to reduce the total length of the optical lens 100 and reduce the assembly sensitivity.

[0209] Among them, such as Figure 7 As shown, the medium inside gap 5 can be a gas, such as air, but it is not limited to this. The medium inside gap 5 can also be optically transparent adhesive, etc.

[0210] The width d of gap 5 is described in detail below. gapThe coupling relationship between the second incident surface 41 and the radius of curvature R2 is as follows:

[0211] like Figure 8 As shown, Figure 8 This is a simplified diagram of the camera module 400 in the second embodiment of this application. (For the purpose of simplifying calculations,) Figure 8 The first lens group G1 is simplified as a curved surface on the first optical path folding element 3, with a radius of curvature of R1, an unfolded length of L1 for the first optical path folding element 3, an unfolded length of L2 for the second optical path folding element 4, a radius of curvature of R2 for the second incident surface 41, and a distance of L1+d between the principal surface of the first lens group G1 and the principal surface of the second incident surface 41 (i.e., the refractive part 6). gap The refractive indices of the first optical path folding element 3 and the second optical path folding element 4 are equal and are n.

[0212] From the combined focal length formula 1 / f = 1 / f1 + 1 / f2 - d / f1f2, we can obtain:

[0213] f / f1 + f / f2 - (L1 + d) gap (5) f / f1f2=1;

[0214] According to the formula relating focal length and refractive index, we can obtain:

[0215] f2 = R2 / (n-1); (6)

[0216] Taking f = 30mm, f1 = 24.68mm, n = 1.8, and L1 = 14mm as an example, the width d can be obtained according to the relationships (5) and (6). gap The curve showing the relationship between the second incident surface 41 and the radius of curvature R2 is as follows: Figure 9 As shown in (a) in the figure, Figure 9 (a) shows the width d gap The curve relating the curvature radius R2 of the second incident surface 41 to the curve is as follows: Figure 9 As can be seen from (a) in the figure, with the width d gap As the width d increases, the radius of curvature R2 of the second incident surface 41 decreases; gap As the radius of curvature R2 of the second incident surface 41 decreases, the radius of curvature R2 of the second incident surface 41 increases.

[0217] like Figure 9 As shown in (b) in the figure, Figure 9 (a) shows the width d gap The relationship curve between the total length TTL of the optical lens 100 and the total length TTL is shown below. Figure 9 As can be seen from (a) in the figure, with the width d gap With the increase of d, the total length TTL of the optical lens 100 increases; with the increase of width d gapThe reduction in TTL of the optical lens 100 leads to a reduction in the total length of the lens.

[0218] The refractive index n of the medium within gap 5 is explained in detail below. gap The coupling relationship between the second incident surface 41 and the radius of curvature R2 is as follows:

[0219] Based on the refractive index n of the medium within gap 5 gap The relationship between the parameters of the first optical path folding element 2 and the second optical path folding element 4 can be expressed by the following matrix equation:

[0220]

[0221] With n = 1.8, L1 = 14 mm, f = 30 mm, R1 = 20 mm, L2 = 36.47 mm, d gap Taking 0.5mm as an example, substituting it into the above equation and simplifying, we can obtain the following equation:

[0222]

[0223] According to equation (8), the width n can be obtained. gap The curve showing the relationship between the second incident surface 41 and the radius of curvature R2 is as follows: Figure 10 As shown in (b) in the figure, Figure 10 (b) shows the refractive index n of the medium within gap 5. gap The curve relating the curvature radius R2 of the second incident surface 41 to the curve is as follows: Figure 10 As can be seen from (b) in the figure, with the increase of the refractive index n of the medium within gap 5... gap As the refractive index n of the medium in the gap 5 increases, the radius of curvature R2 of the second incident surface 41 decreases; gap As the radius of curvature R2 of the second incident surface 41 decreases, the radius of curvature R2 of the second incident surface 41 increases.

[0224] like Figure 10 As shown in (a) in the figure, Figure 10 (a) shows the refractive index n of the medium within gap 5. gap The simulation curve of the radius of curvature R2 of the second incident surface 41, from Figure 10 Figure (a) shows the variation law of the radius of curvature R2 of the second incident surface 41. Figure 10 The curvature radius R2 of the second incident surface 41 in (b) follows the same pattern.

[0225] In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 7As shown, the first optical path folding element 3 is a triple reflection prism, and includes a first incident surface 31 and a first surface 33 arranged along the first direction Z, and a first exit surface 32 and a second surface 34 arranged along the second direction Y. The first incident surface 31 and the first surface 33 are both total reflection surfaces, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0226] The second optical path folding element 4 is a secondary reflection prism, and includes a second exit surface 42 and a third surface 43 arranged along the first direction Z, and a second incident surface 41 and a fourth surface 44 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32. The second exit surface 42 is a total reflection surface, and the fourth surface 44 is a reflection surface. Both the second incident surface 41 and the fourth surface 44 are inclined relative to the first direction Z.

[0227] like Figure 7 As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and after being reflected three times by the second surface 34, the first incident surface 31, and the first surface 33, it exits the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5 and enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 is reflected twice by the second exit surface 42 and the fourth surface 44, and then shines on the photosensitive element 200 through the second exit surface 42.

[0228] In this embodiment, since the second emitting surface 42 and the third surface 43 are arranged along the first direction Z, that is, along the first direction Z, the second emitting surface 42 is located on one side of the second optical path folding element 4. With this arrangement, the photosensitive element 200 can be placed flat on one side of the second optical path folding element 4 (flat placement means that the thickness direction of the photosensitive element 200 is parallel to the first direction Z), which facilitates the installation of the photosensitive element 200.

[0229] In some embodiments, such as Figure 7 As shown, both the second surface 34 and the fourth surface 44 are coated with reflective films, which can be metal films or low group delay dispersion media films.

[0230] In some embodiments, such as Figure 7 As shown, along the first direction Z, the second exit surface 42 is located on the side of the second optical path folding element 4 closest to the first lens group G1. This arrangement allows the dimensions of the photosensitive element 200 and the optical lens 100 to overlap in the first direction Z, avoiding the photosensitive element 200 from adding extra height to the camera module 400 (i.e., the maximum size of the camera module 400 in the first direction Z), thereby helping to reduce the height of the camera module 400 and consequently reducing the thickness of the electronic device.

[0231] In some embodiments, such as Figure 7 As shown, the angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first surface 33 is 2θ, the angle between the second incident surface 41 and the second exit surface 42 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is θ. This arrangement allows light to exit perpendicularly at the first exit surface 32 and the second exit surface 42, and to be incident perpendicularly at the second incident surface 41. This ensures that the light propagates along a predetermined path in the first optical path folding element 3 and the second optical path folding element 4, thereby reducing light energy loss in the first optical path folding element 3 and the second optical path folding element 4.

[0232] It is important to understand that the angle between the second incident surface 41 and the second exit surface 42 is specifically the angle between the base plane m of the second incident surface 41 and the second exit surface 42. The base plane m of the second incident surface 41 is the plane connecting the two endpoints of the second incident surface 41 within the optical axis section of the optical lens 100. The optical axis section of the optical lens 100 refers to the section containing the optical axis 11 of the first lens group G1, the optical axis of the first optical path folding element 3, and the optical axis of the second optical path folding element 4. In other words, the optical axes 11 of the first lens group G1, the optical axis of the first optical path folding element 3, and the optical axis of the second optical path folding element 4 are all located on the optical axis section of the optical lens 100. For example, Figure 7 As shown, the optical axis of the first optical path folding element 3 can be a broken line p11p12-p12p13-p13p14-p14p15, and the optical axis of the second optical path folding element 4 can be a broken line p21p22-p22p23-p23p24.

[0233] In some embodiments, such as Figure 7 As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0234] In some embodiments, such as Figure 7 As shown, in some embodiments, such as Figure 7 As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 7 (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0235] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 3a , Figure 3b The camera module 400 shown is configured as described above, and will not be described in detail here.

[0236] Figure 11aThis is a schematic diagram of the camera module 400 in the fourth embodiment of this application. Figure 11b for Figure 11a The optical path diagram of the camera module 400 in the image. Figure 11a , Figure 11b The camera module 400 and Figure 7 The main difference between the camera module 400 and the previous one is the location of the refraction part 6. Figure 11a , Figure 11b The refractive part 6 is fabricated on the first optical path folding element 3; a third lens group G3 is added to the image side of the second optical path folding element 4, as described below:

[0237] In some embodiments, such as Figure 11a and Figure 11b As shown, the refractive part 6 includes a first exit surface 32, the optical power of the first exit surface 32 is negative, and the second incident surface 41 is a plane, that is, the optical power of the second incident surface 41 is 0.

[0238] In some embodiments, such as Figure 11a and Figure 11b As shown, the optical lens 100 also includes a third lens group G3, which has optical power and is located on the image side of the second optical path folding element 4. The third lens group G3 includes at least one lens.

[0239] By setting a third lens group G3, the incident angle and incident path of the incident light from the photosensitive element 200 can be adjusted, thereby achieving the purpose of correcting field curvature.

[0240] In some embodiments, such as Figure 11a As shown, the third lens group G3 has negative optical power, which allows for better correction of field curvature.

[0241] In some embodiments, such as Figure 11a and Figure 11b As shown, the effective focal length f3 of the third lens group G3 and the effective focal length f of the optical lens 100 satisfy: |f3| / f≥0.8.

[0242] This configuration allows the third lens group G3 to handle a smaller optical power. As a result, the third lens group G3 has a weaker divergence of light passing through the optical path folding element group 2, so that the light does not need to travel a long distance in the optical lens 100 to converge into an image. This helps to shorten the overall length of the optical lens 100, and thus helps to reduce the size of the camera module 400.

[0243] Among them, such as Figure 11aAs shown, the third lens group G3 may include two lenses, namely lens L31 and lens L32, both of which are negative lenses. Of course, the third lens group G3 is not limited to including two lenses; it may also include one lens or three or more lenses, depending on the specific circumstances.

[0244] In other embodiments, the third lens group G3 may also have positive optical power.

[0245] In some embodiments, such as Figure 11b As shown, the effective focal length f of the optical lens 100 is 32mm (equivalent focal length is 192mm).

[0246] When focusing on a distant object (object distance is infinite), the height H1 of the optical lens 100 is 8.95mm. The height H1 of the optical lens 100 is the maximum dimension of the optical lens 100 in the first direction Z.

[0247] The shoulder height H2 of the optical lens 100 (e.g.) Figure 11a The maximum dimension of the bottom surface of the photosensitive element 200 to the optical path folding element group 2 is 5.8 mm.

[0248] The maximum dimension L01 of the optical lens 100 in the second direction Y is 24.5 mm.

[0249] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 7 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0250] Figure 12 This is a schematic diagram of the camera module 400 in the fifth embodiment of this application. Figure 12 The camera module 400 and Figure 7 The main difference between the camera module 400 and the previous one is the location of the refraction part 6. Figure 12 The refractive part 6 is fabricated on the first optical path folding element 3 and the second optical path folding element 4, as described in detail below:

[0251] In some embodiments, such as Figure 12 As shown, the refractive part 6 includes a first exit surface 32 and a second incident surface 41. Both the first exit surface 32 and the second incident surface 41 have optical power, and the combined optical power of the first exit surface 32 and the second incident surface 41 is negative. That is, the refractive part 6 is respectively fabricated on the first optical path folding element 3 and the second optical path folding element 4.

[0252] Compared to fabricating the refractive part 6 on one of the first optical path folding element 3 and the second optical path folding element 4, fabricating the refractive part 6 on both the first optical path folding element 3 and the second optical path folding element 4 increases the number of optically powerful surfaces in the optical path folding element group 2, increases the degree of design freedom, and thus facilitates aberration correction of the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0253] In some embodiments, such as Figure 12 As shown, the optical power of the first exit surface 32 is opposite to that of the second incident surface 41, for example... Figure 12 As shown, the optical power of the first exit surface 32 is negative, and the optical power of the second incident surface 41 is positive. This setting can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0254] In some embodiments, the curvature directions of the first exit surface 32 and the second incident surface 41 may be consistent, specifically as follows: Figure 12 As shown, the first exit surface 32 bends away from the second incident surface 41, and the second incident surface 41 bends towards the first exit surface 32. With this configuration, when there is a certain positional deviation between the first exit surface 32 and the second incident surface 41, the change in the propagation direction of the light after passing through the first exit surface 32 and the second incident surface 41 is relatively small, thereby helping to reduce the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4.

[0255] In some embodiments, such as Figure 12 As shown, both the first exit surface 32 and the second incident surface 41 can be spherical. With this configuration, when there is a certain deviation in the positions of the first exit surface 32 and the second incident surface 41, the change in the propagation direction of the light after passing through the first exit surface 32 and the second incident surface 41 is smaller, which helps to further reduce the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4.

[0256] To further illustrate the effect of reducing the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4, as shown in Tables 2.1 to 2.5, Table 2.1 shows the MTF value of the optical lens 100 when the second optical path folding element 4 is stationary; Tables 2.2 and 2.3 show the MTF values ​​of the optical lens 100 when the second optical path folding element 4 is moved along the eccentric direction P, such that the eccentric distances of the second optical path folding element 4 in the second direction Y and the third direction X are 10 μm respectively; Tables 2.4 and 2.5 show the MTF values ​​of the optical lens 100 when the second optical path folding element 4 is moved along the eccentric direction P, such that the eccentric distances of the second optical path folding element 4 in the second direction Y and the third direction X are 30 μm respectively; wherein, the eccentric direction P is perpendicular to the incident optical axis of the second optical path folding element 4 (e.g., ...). Figure 12 The lines shown are p21 and p22.

[0257] As can be seen from Tables 2.1 to 2.5, the difference between the MTF value of the optical lens 100 when the second optical path folding element 4 moves along the eccentric direction P and the MTF value of the optical lens 100 when the second optical path folding element 4 does not move is relatively small, indicating that the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4 is relatively low.

[0258] Table 2.1

[0259]

[0260] Table 2.2

[0261]

[0262] Table 2.3

[0263]

[0264] Table 2.4

[0265]

[0266] Table 2.5

[0267]

[0268] In Tables 2.1 to 2.5, "0F" represents the optical axis position of the optical lens 100, and "0.1F" to "0.9F" represent multiple different positions of the optical lens 100 from the center to the edge (excluding the optical axis position). "MTFT" is an abbreviation for "Modulation Transfer Function at Tangential direction," which describes the ability of an optical system to transfer and reproduce target details of different spatial frequencies in the tangential direction; a higher value indicates better detail reproduction. "MTFS" is an abbreviation for "Modulation Transfer Function at Sagittal direction," which measures the performance of an optical system in transferring target details of different spatial frequencies in the sagittal direction, reflecting the system's ability to resolve details in that direction.

[0269] Figure 13 for Figure 12 The diagram shows a size comparison between the optical lens 100 and an optical lens 100 without the refractive section 6 (i.e., a comparison lens). Figure 13 (a) in the figure is shown as Figure 12 The optical lens 100 shown is shown. Figure 13 (b) in the image shows a comparison shot. (From...) Figure 13 It can be seen that, Figure 12 The size L01 of the optical lens 100 shown is significantly smaller than the size L02 of the comparison lens. For example, L01 = 24.5 mm and L02 = 29 mm. Therefore, by providing the refractive part 6, the size gain of the optical lens 100 is 4 to 5 mm.

[0270] Among them, such as Figure 13 As shown in (a), the dimension L01 of the optical lens 100 is in the second direction Y. The second direction Y is perpendicular to the optical axis 11 of the first lens group G1 and parallel to the optical axis section of the optical lens 100; as shown in (a), the optical lens 100 has a dimension L01 in the second direction Y. Figure 13 As shown in (b), the size L02 of the comparison lens is the size of the comparison lens in the second direction Y.

[0271] In some embodiments, such as Figure 12 As shown, the first lens group G1 is a focusing lens group. When the optical lens 100 is focusing, the first lens group G1 moves along the optical axis 11 of the first lens group G1 (for example, along...). Figure 12 (moving in the Z direction), and the first lens group G1 is an image-stabilizing lens group. When the optical lens 100 is in image stabilization mode, the first lens group G1 moves along a direction perpendicular to the optical axis 11 of the first lens group G1 (e.g., along the Z direction). Figure 12 (Y-axis movement).

[0272] Among them, such as Figure 14a and Figure 14b As shown, Figure 14a for Figure 12 The diagram shows the optical lens 100 in its state when focusing on distant and close-up objects. Figure 14b for Figure 14a The optical path diagrams shown are illustrated for focusing on distant and close-up objects using the optical lens 100. When the optical lens 100 is focusing on a distant object (e.g., a close-up object), the optical path diagrams are also shown. Figure 14a (a) in the image shows the state where the focus is switched to close-up (e.g., the state shown in the image). Figure 14a In the state shown in (b), the first lens group G1 moves along the first optical axis 11 in a direction away from the first optical path folding element 3 (e.g., Figure 14a As the lens moves upward, the gap between the first lens group G1 and the second lens group G2 increases.

[0273] When the optical lens 100 switches from focusing on a close-up to focusing on a distant view, the first lens group G1 moves along the first optical axis 11 toward the direction closer to the first optical path folding element 3, and the gap between the first lens group G1 and the second lens group G2 decreases.

[0274] It's important to understand that: "Optical lens 100 focusing on close-up" means the optical lens 100 can clearly image the subject at a first object distance; "Optical lens 100 focusing on distant-upper-view" means the optical lens 100 can clearly image the subject at a second object distance, which is greater than the first object distance. The first object distance can be the maximum object distance at which the optical lens 100 can clearly image, such as infinity, while the second object distance can be the minimum object distance at which the optical lens 100 can clearly image, such as 100mm.

[0275] In some embodiments, such as Figure 14a and Figure 14b As shown, when the optical lens 100 switches from focusing on a distant scene (object distance is infinity) to focusing on a close scene (object distance is 1.5m), the focusing travel of the first lens group G1 (i.e. the distance the first lens group G1 moves along its optical axis 11) is 0.26mm.

[0276] In some embodiments, such as Figure 14a and Figure 14b As shown, when focusing on a distant object (object distance is infinity), the height of the optical lens 100 is 8.6 mm; when focusing on a close-up object (object distance is 1.5 m), the height of the optical lens 100 is 8.86 mm. The height of the optical lens 100 is its maximum dimension in the first direction Z.

[0277] In some embodiments, such as Figure 12As shown, the optical lens 100 has an image stabilization angle of 0.5° in the second direction Y and an image stabilization angle of 0.5° in the third direction X. Wherein, as... Figure 2a and Figure 12 As shown, the third direction X is perpendicular to both the first direction Z and the second direction Y. The stabilization angle of 0.5° in the second direction Y means that the angle range that can be compensated in the second direction Y is 0.5°. The stabilization angle of 0.5° in the third direction X means that the angle range that can be compensated in the third direction X is 0.5°.

[0278] When holding electronic devices (such as smartphones and digital cameras), hand shake is inevitable. This shake can cause blurry images. For example, when holding a phone to take photos or videos, the hand may shake slightly up and down (Y direction) or left and right (X direction). Image stabilization means that the optical lens 100 can compensate for a maximum of about 0.5° of shake in both the X and Y directions, thus keeping the captured image relatively sharp.

[0279] In some embodiments, such as Figure 12 As shown, at the position of the optical axis of the optical lens 100, the ΔMTF of the optical lens 100 satisfies:

[0280] ΔMTF < 0.1;

[0281] At positions other than the optical axis of optical lens 100, the ΔMTF of optical lens 100 satisfies:

[0282] ΔMTF < 0.25;

[0283] Wherein, ΔMTF = MTF0 - MTF1, MTF0 is the MTF value of the optical lens 100 when it is stationary relative to the subject, at a spatial frequency of 1 / 4 of the Nyquist frequency of the image sensor 200; MTF1 is the MTF value of the optical lens 100 when it is image-stabilized, at a spatial frequency of 1 / 4 of the Nyquist frequency of the image sensor 200. For example, the spatial frequency of the optical lens 100 can be 125 lp / mm, 180 lp / mm, etc.

[0284] This configuration ensures that the MTF loss of the optical lens 100 is small when the first lens group G1 moves to perform image stabilization, thereby helping to guarantee the imaging quality of the optical lens 100.

[0285] To further illustrate the image stabilization effect of the first lens group G1 during movement, as shown in Table 2.6, Table 2.6 compares the MTF values ​​of the optical lens 100 in a stationary state and in an image-stabilized state. It can be seen from Table 2.6 that the difference in MTF values ​​between the optical lens 100 in a stationary state and in an image-stabilized state is small, indicating that the MTF loss of the optical lens 100 is small when the first lens group G1 performs image stabilization while moving, which is beneficial to ensuring the imaging quality of the optical lens 100.

[0286] Table 2.6

[0287]

[0288] The original state in Table 2.6 is the state when the optical lens 100 is stationary relative to the subject. OIS1 is the MTF value of the optical lens 100 when the first lens group G1 moves in the positive direction of the third direction X. OIS2 is the MTF value of the optical lens 100 when the first lens group G1 moves in the negative direction of the third direction X. OIS3 is the MTF value of the optical lens 100 when the first lens group G1 moves in the positive direction of the second direction Y. OIS4 is the MTF value of the optical lens 100 when the first lens group G1 moves in the negative direction of the second direction Y.

[0289] In some embodiments, such as Figure 12 As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 12 (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11 and L12 are positive lenses, and lenses L13 and L14 are negative lenses.

[0290] In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 12 As shown, the first optical path folding element 3 is a triple reflection prism, and includes a first incident surface 31 and a first surface 33 arranged in the first direction Z, and a first exit surface 32 and a second surface 34 arranged in the second direction Y. The first incident surface 31 and the first surface 33 are both total reflection surfaces, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0291] The second optical path folding element 4 is a secondary reflection prism, and includes a third surface 43 and a fourth surface 44 arranged along the first direction Z, and a second incident surface 41 and a second exit surface 42 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32, and a gap 5 is formed between the second incident surface 41 and the first exit surface 32. The third surface 43 and the fourth surface 44 are both total reflection surfaces, and the second incident surface 41 and the second exit surface 42 are both inclined relative to the first direction Z.

[0292] like Figure 12 As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and then undergoes three reflections through the second surface 34, the first incident surface 31, and the first surface 33, before exiting the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5, and then enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 undergoes two reflections through the third surface 43 and the fourth surface 44, before exiting the second exit surface 42 and striking the photosensitive element 200.

[0293] In some embodiments, such as Figure 12 As shown, a reflective film is deposited on the second surface 34. The reflective film can be a metal film or a low group delay dispersion medium film.

[0294] In some embodiments, such as Figure 12 As shown, along the first direction Z, the fourth surface 44 is located on the side of the second optical path folding element 4 away from the first lens group G1; the angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first surface 33 is 2θ, the angle between the second incident surface 41 and the third surface 43 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is 2θ.

[0295] It is important to understand that: such as Figure 12 As shown, the angle between the first exit surface 32 and the first surface 33 is specifically the angle between the base plane n of the first exit surface 32 and the first surface 33. The base plane n of the first exit surface 32 is: a plane connecting the two endpoints of the first exit surface 32 within the optical axis section of the optical lens 100. The angle between the second incident surface 41 and the third surface 43 is specifically the angle between the reference plane m of the second incident surface 41 and the third surface 43. The base plane m of the second incident surface 41 is: a plane connecting the two endpoints of the second incident surface 41 within the optical axis section of the optical lens 100.

[0296] In some embodiments, such as Figure 12 As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0297] In some embodiments, such as Figure 12 As shown, the effective focal length f of optical lens 100 is 26.6mm (equivalent focal length is 160mm), the aperture number Fno is 3.2, the image height ImgH of optical lens 100 is 3.6mm, and the shoulder height of optical lens 100 (e.g.) Figure 12 The maximum dimension of the folded element group 2 in the first direction Z is 4.1 mm.

[0298] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 7 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0299] Figure 15a This is a schematic diagram of the camera module 400 in the sixth embodiment of this application. Figure 15b for Figure 15a The optical path diagram of the camera module 400 in the image. Figure 15a , Figure 15b The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 15a , Figure 15b The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different, as shown below:

[0300] like Figure 15a and Figure 15b As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 15a (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0301] In some embodiments, such as Figure 15b As shown, the effective focal length f of the optical lens 100 is 32.8mm (equivalent focal length is 197mm).

[0302] When focusing on a distant object (object distance is infinity), the height H1 of the optical lens 100 is 8.85mm; when focusing on a close object (object distance is 1.5m), the height H1 of the optical lens 100 is 9.2mm. The height H1 of the optical lens 100 is the maximum dimension of the optical lens 100 in the first direction Z.

[0303] The shoulder height H2 of the optical lens 100 (e.g.) Figure 15b The maximum dimension of the folded element group 2 in the first direction Z is 4.2mm.

[0304] The maximum dimension L01 of the optical lens 100 in the second direction Y is 28mm. For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0305] Figure 16a This is a schematic diagram of the camera module 400 in the seventh embodiment of this application. Figure 16b for Figure 16aThe optical path diagram of the camera module 400 in the image. Figure 16a , Figure 16b The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 16a , Figure 16b The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different; Figure 16a , Figure 16b The camera module 400 provides parameters such as the radius of curvature, thickness, refractive index, Abbe number, and aspheric coefficient of each optical element, as detailed below:

[0306] In some embodiments, such as Figure 16a and Figure 16b As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 16a (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0307] In some embodiments, such as Figure 16a and Figure 16b As shown, the effective focal length f of the optical lens 100 is 26.9mm, and the aperture number Fno is 3.19.

[0308] The following section discusses specific parameters. Figure 16a as well as Figure 16b The optical lens 100 shown will be described in detail.

[0309] As shown in Tables 3.1 and 3.2, Table 3.1 shows the main parameters of the optical lens 100 in the seventh embodiment of this application, and Table 3.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the seventh embodiment of this application.

[0310] Table 3.1

[0311]

[0312] The units for the radius of curvature and thickness parameters in Table 3.1 are all mm.

[0313] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; and S9 represents the image-side surface of lens L14.

[0314] PRISM1 represents the first optical path folding element 3, which is a triple-reflection prism with light folding function. S9 represents the first incident surface 31 of the first optical path folding element 3. S10 represents the second surface 34 of the first optical path folding element 3. S11 represents the first incident surface 31 of the first optical path folding element 3. S12 represents the first surface 33 of the first optical path folding element 3. S13 represents the first exit surface 32 of the first optical path folding element 3.

[0315] PRISM2 represents the second optical path folding element 4, which is a secondary reflection prism with light folding function. S14 represents the second incident surface 41 of the second optical path folding element 4, S15 represents the third surface 43 of the second optical path folding element 4, S16 represents the fourth surface 44 of the second optical path folding element 4, and S17 represents the second exit surface 42 of the second optical path folding element 4.

[0316] IRCF represents an infrared filter, S18 is the object-side surface of the filter, and S19 is the image-side surface of the filter.

[0317] Table 3.2

[0318] surface <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> S3 2.69997E-04 -4.01878E-06 2.40935E-07 -1.68578E-08 1.65375E-09 6.63303E-12 S4 -7.14544E-05 1.47050E-05 3.94020E-07 -4.20850E-09 1.60394E-10 -6.71174E-12 S5 1.69987E-04 -8.86372E-06 -1.59822E-08 7.46181E-08 -6.64800E-11 1.54339E-11 S6 -1.15822E-04 2.43858E-05 1.09818E-06 -7.48035E-09 1.93309E-09 3.50887E-11 S7 5.47245E-04 1.44523E-05 9.04678E-07 2.70242E-08 -3.02687E-09 -5.41185E-11 S8 2.02262E-03 1.71664E-07 -1.89044E-06 2.53799E-07 -6.46562E-09 -2.74245E-10

[0319] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0320] Figure 17a This is a schematic diagram of the camera module 400 in the eighth embodiment of this application. Figure 17b for Figure 17a The optical path diagram of the camera module 400 in the image. Figure 17a , Figure 17b The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 17a , Figure 17b The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different; Figure 17a , Figure 17b The second optical path folding element 4 of the camera module 400 is a primary reflection prism; Figure 17a , Figure 17b The camera module 400 provides parameters such as the radius of curvature, thickness, refractive index, Abbe number, and aspheric coefficient of each optical element, as detailed below:

[0321] In some embodiments, such as Figure 17a and Figure 17bAs shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 17a (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0322] In some embodiments, the first optical path folding element 3 can be a multiple-reflection prism, and the second optical path folding element 4 can be a single-reflection prism, specifically as follows: Figure 17a and Figure 17b As shown, the first optical path folding element 3 is a triple reflection prism, and includes a first incident surface 31 and a first surface 33 arranged in the first direction Z, and a first exit surface 32 and a second surface 34 arranged in the second direction Y. The first incident surface 31 and the first surface 33 are both total reflection surfaces, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0323] The second optical path folding element 4 is a primary reflection prism, and includes a third surface 43 and a fourth surface 44 arranged along the first direction Z, and a second incident surface 41 and a second exit surface 42 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32, and a gap 5 is formed between the second incident surface 41 and the first exit surface 32. The third surface 43 is a total reflection surface, and both the second incident surface 41 and the second exit surface 42 are inclined relative to the first direction Z.

[0324] like Figure 17a and Figure 17b As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and then undergoes three reflections in sequence through the second surface 34, the first incident surface 31, and the first surface 33 before exiting the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5, and then enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 is reflected by the third surface 43 and then shines on the photosensitive element 200 through the second exit surface 42.

[0325] In some embodiments, such as Figure 17a and Figure 17bAs shown, along the first direction Z, the fourth surface 44 is located on the side of the second optical path folding element 4 away from the first lens group G1; the angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first surface 33 is 2θ, the angle between the second incident surface 41 and the third surface 43 is 2θ, and the angle between the second exit surface 42 and the third surface 43 is 2θ. With this configuration, light can exit perpendicularly at the first exit surface 32 and the second exit surface 42, and enter perpendicularly at the second incident surface 41, thereby allowing the light to propagate along a predetermined path in the first optical path folding element 3 and the second optical path folding element 4, reducing light energy loss in the first optical path folding element 3 and the second optical path folding element 4.

[0326] It is important to understand that: such as Figure 17a As shown, the angle between the first exit surface 32 and the first surface 33 is specifically the angle between the base plane n of the first exit surface 32 and the first surface 33. The base plane n of the first exit surface 32 is: a plane connecting the two endpoints of the first exit surface 32 within the optical axis section of the optical lens 100. The angle between the second incident surface 41 and the third surface 43 is specifically the angle between the reference plane m of the second incident surface 41 and the third surface 43. The base plane m of the second incident surface 41 is: a plane connecting the two endpoints of the second incident surface 41 within the optical axis section of the optical lens 100.

[0327] In some embodiments, such as Figure 17a As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0328] In some embodiments, such as Figure 17a and Figure 17b As shown, the effective focal length f of the optical lens 100 is 26.6mm, and the aperture number Fno is 3.07.

[0329] The following section discusses specific parameters. Figure 17a as well as Figure 17b The optical lens 100 shown will be described in detail.

[0330] As shown in Tables 4.1 and 4.2, Table 4.1 shows the main parameters of the optical lens 100 in the eighth embodiment of this application, and Table 4.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the eighth embodiment of this application.

[0331] Table 4.1

[0332]

[0333] The units for the radius of curvature and thickness parameters in Table 4.1 are all mm.

[0334] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S2 represents the object-side surface of lens L11; S3 represents the image-side surface of lens L11; S4 represents the object-side surface of lens L12; S5 represents the image-side surface of lens L12; S6 represents the object-side surface of lens L13; S7 represents the image-side surface of lens L13; S8 represents the object-side surface of lens L14; and S9 represents the image-side surface of lens L14.

[0335] PRISM1 represents the first optical path folding element 3, which is a triple-reflection prism with light folding function. S9 represents the first incident surface 31 of the first optical path folding element 3. S10 represents the second surface 34 of the first optical path folding element 3. S11 represents the first incident surface 31 of the first optical path folding element 3. S12 represents the first surface 33 of the first optical path folding element 3. S13 represents the first exit surface 32 of the first optical path folding element 3.

[0336] PRISM2 represents the second optical path folding element 4, which is a secondary reflection prism with light folding function. S14 represents the second incident surface 41 of the second optical path folding element 4, S15 represents the third surface 43 of the second optical path folding element 4, and S16 represents the second exit surface 42 of the second optical path folding element 4.

[0337] IRCF represents an infrared filter, S17 is the object-side surface of the filter, and S18 is the image-side surface of the filter.

[0338] Table 4.2

[0339] surface <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> S1 2.65E-04 -5.38E-06 1.84E-07 -1.85E-08 1.59E-09 S2 -7.18E-05 1.33E-05 2.94E-07 -6.88E-09 2.49E-10 S3 8.64E-05 -9.83E-06 -4.07E-08 7.15E-08 -4.40E-10 S4 -1.26E-04 2.08E-05 9.49E-07 -1.19E-08 1.72E-09 S5 5.92E-04 1.52E-05 8.25E-07 1.56E-08 -3.06E-09 S6 1.97E-03 2.23E-06 -1.61E-06 2.49E-07 -9.93E-09

[0340] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0341] Figure 18 This is a schematic diagram of the camera module 400 in the ninth embodiment of this application. Figure 18 The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 18 The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different; Figure 18 The positions of the exit surfaces of the first optical path folding element 3 and the second optical path folding element 4 of the camera module 400 are different, as detailed below:

[0342] In some embodiments, such as Figure 18 As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 18 (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0343] In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 18 As shown, the first optical path folding element 3 is a secondary reflection prism, and includes a first incident surface 31 and a first surface 33 arranged along the first direction Z, and a first exit surface 32 and a second surface 34 arranged along the second direction Y. The first incident surface 31 is a total reflection surface, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0344] The second optical path folding element 4 is a secondary reflection prism, and includes a second exit surface 42 and a third surface 43 arranged along the first direction Z, and a second incident surface 41 and a fourth surface 44 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32. The second exit surface 42 is a total reflection surface, and the fourth surface 44 is a reflection surface. Both the second incident surface 41 and the fourth surface 44 are inclined relative to the first direction Z.

[0345] like Figure 18 As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and after being reflected twice by the second surface 34 and the first incident surface 31, it exits the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5, and then enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 is reflected twice by the second exit surface 42 and the fourth surface 44, and then shines on the photosensitive element 200 through the second exit surface 42.

[0346] In some embodiments, such as Figure 18 As shown, a reflective film is deposited on the fourth surface 44. The reflective film can be a metal film or a low-group delay dispersion medium film.

[0347] In some embodiments, such as Figure 18 As shown, along the first direction Z, the second exit surface 42 is located on the side of the second optical path folding element 4 away from the first lens group G1. The angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first incident surface 31 and the first exit surface 32 is 2θ, the angle between the second incident surface 41 and the second exit surface 42 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is θ.

[0348] With this configuration, light can exit perpendicularly at the first exit surface 32 and the second exit surface 42, and enter perpendicularly at the second incident surface 41, thereby allowing the light to propagate along a preset path in the first optical path folding element 3 and the second optical path folding element 4, so as to reduce the light energy loss in the first optical path folding element 3 and the second optical path folding element 4.

[0349] In some embodiments, such as Figure 18 As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0350] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0351] Figure 19 This is a schematic diagram of the camera module 400 in the tenth embodiment of this application. Figure 19 The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 19 The first exit surface 32 and the second incident surface 41 of the camera module 400 are both curved toward the image side; Figure 19 The first optical path folding element 3 of the central camera module 400 is a secondary reflection prism, and the second optical path folding element 4 is a tertiary reflection prism, as described below:

[0352] In some embodiments, such as Figure 12 As shown, the refractive part 6 includes a first exit surface 32 and a second incident surface 41. Both the first exit surface 32 and the second incident surface 41 have optical power, and the combined optical power of the first exit surface 32 and the second incident surface 41 is negative.

[0353] In this case, the optical power of the first exit surface 32 is opposite to that of the second incident surface 41, for example... Figure 19 As shown, the optical power of the first exit surface 32 is positive, and the optical power of the second incident surface 41 is negative. This setting can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0354] In some embodiments, the curvature directions of the first exit surface 32 and the second incident surface 41 may be consistent, specifically as follows: Figure 19 As shown, the first exit surface 32 bends toward the side closer to the second incident surface 41, and the second incident surface 41 bends toward the side farther away from the first exit surface 32.

[0355] With this configuration, when there is a certain deviation between the positions of the first exit surface 32 and the second incident surface 41, the change in the propagation direction of the light after passing through the first exit surface 32 and the second incident surface 41 is relatively small, which helps to reduce the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4.

[0356] In some embodiments, such as Figure 19 As shown, both the first exit surface 32 and the second incident surface 41 can be spherical. When there is a certain deviation between the positions of the first exit surface 32 and the second incident surface 41, the change in the propagation direction of the light after passing through the first exit surface 32 and the second incident surface 41 is smaller, which helps to further reduce the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4.

[0357] In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 19 As shown, the first optical path folding element 3 is a secondary reflection prism, and includes a first incident surface 31 and a first surface 33 arranged in the first direction Z, and a first exit surface 32 and a second surface 34 arranged in the second direction Y. The first incident surface 31 is a total reflection surface, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0358] The second optical path folding element 4 is a triple reflection prism, and includes a third surface 43 and a fourth surface 44 arranged along the first direction Z, and a second incident surface 41 and a second exit surface 42 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32, and a gap 5 is formed between the second incident surface 41 and the first exit surface 32. The third surface 43 and the fourth surface 44 are both total reflection surfaces, and the second incident surface 41 and the second exit surface 42 are both inclined relative to the first direction Z.

[0359] like Figure 19 As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and after being reflected twice by the second surface 34 and the first incident surface 31, it exits the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5, and then enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 is reflected three times by the second exit surface 42, the third surface 43, and the fourth surface 44, and then shines on the photosensitive element 200 through the second exit surface 42.

[0360] In some embodiments, such as Figure 19 As shown, a reflective film is deposited on the second surface 34. The reflective film can be a metal film or a low group delay dispersion medium film.

[0361] In some embodiments, such as Figure 19 As shown, along the first direction Z, the fourth surface 44 is located on the side of the second optical path folding element 4 away from the first lens group G1. The angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first incident surface 31 is 2θ, the angle between the second incident surface 41 and the fourth surface 44 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is 2θ.

[0362] In some embodiments, such as Figure 12 As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0363] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0364] Figure 20a This is a schematic diagram of the camera module 400 in the eleventh embodiment of this application. Figure 20b for Figure 20a The optical path diagram of the camera module 400 in the image. Figure 20a , Figure 20b The camera module 400 and Figure 12 The main difference between the camera module 400 and the other two is: Figure 20a , Figure 20b The second incident surface 41 of the camera module 400 is an aspherical surface; Figure 20a , Figure 20b The position of the second emission surface 42 of the camera module 400 is different; Figure 20a , Figure 20b The optical power distribution of the four lenses in the first lens group G1 of the camera module 400 is different, as detailed below:

[0365] In some embodiments, such as Figure 20a and Figure 20b As shown, the refractive part 6 includes a first exit surface 32 and a second incident surface 41. Both the first exit surface 32 and the second incident surface 41 have optical power, and the combined optical power of the first exit surface 32 and the second incident surface 41 is negative.

[0366] The first exit surface 32 is spherical, and the second incident surface 41 is aspherical. This arrangement can correct the aberrations of the optical lens 100 and reduce the assembly sensitivity of the first optical path folding element 3 and the second optical path folding element 4 to a certain extent.

[0367] Of course, it is not limited to this. The first exit surface 32 can also be an aspherical surface and the second incident surface 41 can be a spherical surface; or, both the first exit surface 32 and the second incident surface 41 can be aspherical surfaces.

[0368] In some embodiments, such as Figure 20a and Figure 20b As shown, the optical power of the first exit surface 32 is opposite to that of the second incident surface 41, for example... Figure 20a As shown, the optical power of the first exit surface 32 is negative, and the optical power of the second incident surface 41 is positive. This setting can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0369] In some embodiments, such as Figure 20a As shown, the first lens group G1 includes four lenses along the direction from the object side to the image side (e.g., Figure 20a (From top to bottom) The four lenses are lens L11, lens L12, lens L13 and lens L14. Lenses L11, L12 and L13 are positive lenses, and lens L14 is a negative lens.

[0370] In some embodiments, the first optical path folding element 3 and the second optical path folding element 4 can both be multiple reflection prisms, specifically as follows: Figure 20a As shown, the first optical path folding element 3 is a triple reflection prism, and includes a first incident surface 31 and a first surface 33 arranged in the first direction Z, and a first exit surface 32 and a second surface 34 arranged in the second direction Y. The first incident surface 31 and the first surface 33 are total reflection surfaces, and the second surface 34 is a reflection surface. The first exit surface 32 and the second surface 34 are both inclined relative to the first direction Z.

[0371] The second optical path folding element 4 is a secondary reflection prism, and includes a third surface 43 and a fourth surface 44 arranged along the first direction Z, and a second incident surface 41 and a second exit surface 42 arranged along the second direction Y. The second incident surface 41 is disposed facing the first exit surface 32, and a gap 5 is formed between the second incident surface 41 and the first exit surface 32. The second exit surface 42 is a total reflection surface, and both the second incident surface 41 and the fourth surface 44 are inclined relative to the first direction Z.

[0372] like Figure 20a As shown, light passing through the first lens group G1 enters the first optical path folding element 3 through the first incident surface 31, and then undergoes three reflections through the second surface 34, the first incident surface 31, and the first surface 33, before exiting the first optical path folding element 3 through the first exit surface 32. The light exiting the first optical path folding element 3 enters the gap 5, and then enters the second optical path folding element 4 through the second incident surface 41. The light entering the second optical path folding element 4 undergoes two reflections through the second exit surface 42 and the fourth surface 44, before being directed towards the photosensitive element 200 through the second exit surface 42.

[0373] In some embodiments, such as Figure 20a As shown, a reflective film is deposited on the second surface 34 and the fourth surface 44. The reflective film can be a metal film or a low group delay dispersion medium film.

[0374] In some embodiments, such as Figure 20a As shown, along the first direction Z, the second exit surface 42 is located on the side of the second optical path folding element 4 close to the first lens group G1; the angle between the first incident surface 31 and the second surface 34 is θ, the angle between the first exit surface 32 and the first surface 33 is 2θ, the angle between the second incident surface 41 and the second exit surface 42 is 2θ, and the angle between the second exit surface 42 and the fourth surface 44 is θ.

[0375] In some embodiments, such as Figure 20a As shown, the angle θ between the first incident surface 31 and the second surface 34 satisfies: 22°≤θ≤40°.

[0376] In some embodiments, such as Figure 20b As shown, the effective focal length f of the optical lens 100 is 31.5mm (equivalent focal length is 189mm).

[0377] When focusing on a distant object (object distance is infinite), the height H1 of the optical lens 100 is 8.95mm. The height H1 of the optical lens 100 is the maximum dimension of the optical lens 100 in the first direction Z.

[0378] The shoulder height H2 of the optical lens 100 (e.g.) Figure 20b The maximum dimension of the bottom surface of the photosensitive element 200 to the optical path folding element group 2 is 5.2 mm. For details regarding the other structures of the camera module 400 in this embodiment, please refer to... Figure 12 The camera module 400 shown is configured as described above, and will not be described in detail here.

[0379] Figure 21a This is a schematic diagram of the camera module 400 in the twelfth embodiment of this application. Figure 21b for Figure 21a The optical path diagram of the camera module 400 in the image. Figure 21a , Figure 21b The camera module 400 and Figure 20a , Figure 20b The main difference between the camera module 400 and the other two is: Figure 21a , Figure 21b The first exit surface 32 and the second incident surface 41 of the camera module 400 are both aspherical surfaces. Figure 21a , Figure 21b The camera module 400 provides parameters such as the radius of curvature, thickness, refractive index, Abbe number, and aspheric coefficient of each optical element, as detailed below:

[0380] In some embodiments, such as Figure 21a and Figure 21b As shown, the refractive part 6 includes a first exit surface 32 and a second incident surface 41. Both the first exit surface 32 and the second incident surface 41 have optical power, and the combined optical power of the first exit surface 32 and the second incident surface 41 is negative.

[0381] The first exit surface 32 and the second incident surface 41 are both aspherical. This arrangement helps to correct aberrations in the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0382] In some embodiments, such as Figure 21a and Figure 21b As shown, the optical power of the first exit surface 32 is opposite to that of the second incident surface 41, for example... Figure 21a As shown, the optical power of the first exit surface 32 is negative, and the optical power of the second incident surface 41 is positive. This setting can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0383] In some embodiments, such as Figure 21a and Figure 21b As shown, the effective focal length of the optical lens 100 is f = 31mm, and the aperture number is Fno = 3.56. The following section discusses the specific parameters... Figure 21a as well as Figure 21b The optical lens 100 shown will be described in detail.

[0384] As shown in Tables 5.1 and 5.2, Table 5.1 shows the main parameters of the optical lens 100 in the twelfth embodiment of this application, and Table 5.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the twelfth embodiment of this application.

[0385] Table 5.1

[0386]

[0387] The units for the radius of curvature and thickness parameters in Table 5.1 are all mm.

[0388] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S1 represents the object-side surface of lens L11; S2 represents the image-side surface of lens L11; S3 represents the object-side surface of lens L12; S4 represents the image-side surface of lens L12; S5 represents the object-side surface of lens L13; S6 represents the image-side surface of lens L13; S7 represents the object-side surface of lens L14; and S8 represents the image-side surface of lens L14.

[0389] PRISM1 represents the first optical path folding element 3, which is a triple-reflection prism with light folding function. S9 represents the first incident surface 31 of the first optical path folding element 3. S10 represents the second surface 34 of the first optical path folding element 3. S11 represents the first incident surface 31 of the first optical path folding element 3. S12 represents the first surface 33 of the first optical path folding element 3. S13 represents the first exit surface 32 of the first optical path folding element 3.

[0390] PRISM2 represents the second optical path folding element 4, which is a secondary reflection prism with light folding function. S14 represents the second incident surface 41 of the second optical path folding element 4, S15 represents the second exit surface 42 of the second optical path folding element 4, S16 represents the fourth surface 44 of the second optical path folding element 4, and S17 represents the second exit surface 42 of the second optical path folding element 4.

[0391] IRCF represents an infrared filter, S18 is the object-side surface of the filter, and S19 is the image-side surface of the filter.

[0392] Table 5.2

[0393]

[0394] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 20a , Figure 20b The camera module 400 shown is configured as described above, and will not be described in detail here.

[0395] Figure 22a This is a schematic diagram of the camera module 400 in the thirteenth embodiment of this application. Figure 22b for Figure 22a The optical path diagram of the camera module 400 in the image. Figure 22a , Figure 22b The camera module 400 and Figure 20a , Figure 20b The main difference between the camera module 400 and the other two is: Figure 22a , Figure 22b The first exit surface 32 and the second incident surface 41 of the camera module 400 are both aspherical. Figure 22a , Figure 22b The camera module 400 in the middle has a third lens group G3 added to the image side of the second optical path folding element 4; Figure 22a , Figure 22b The camera module 400 provides parameters such as the radius of curvature, thickness, refractive index, Abbe number, and aspheric coefficient of each optical element, as detailed below:

[0396] In some embodiments, such as Figure 22a and Figure 22b As shown, the refractive part 6 includes a first exit surface 32 and a second incident surface 41. Both the first exit surface 32 and the second incident surface 41 have optical power, and the combined optical power of the first exit surface 32 and the second incident surface 41 is negative.

[0397] The first exit surface 32 and the second incident surface 41 are both aspherical. This arrangement helps to correct aberrations in the optical lens 100, thereby improving the imaging quality of the optical lens 100.

[0398] In some embodiments, such as Figure 22a and Figure 22b As shown, the optical power of the first exit surface 32 is opposite to that of the second incident surface 41, for example... Figure 22a As shown, the optical power of the first exit surface 32 is negative, and the optical power of the second incident surface 41 is positive. This setting can cancel out some aberrations, thereby helping to reduce the aberrations of the optical lens 100 and ensuring the imaging quality of the optical lens 100.

[0399] In some embodiments, such as Figure 22a and Figure 22b As shown, the optical lens 100 also includes a third lens group G3, which has optical power and is located on the image side of the second optical path folding element 4. The third lens group G3 includes at least one lens.

[0400] By setting a third lens group G3, the incident angle and incident path of the incident light from the photosensitive element 200 can be adjusted, thereby achieving the purpose of correcting field curvature.

[0401] In some embodiments, such as Figure 22a As shown, the third lens group G3 has negative optical power, which allows for better correction of field curvature.

[0402] Among them, such as Figure 22a As shown, the third lens group G3 may include one lens, namely lens L31. Of course, the third lens group G3 is not limited to including one lens; it may also include two or more lenses, depending on the specific circumstances.

[0403] In some embodiments, such as Figure 22a and Figure 22bAs shown, the effective focal length f3 of the third lens group G3 and the effective focal length f of the optical lens 100 satisfy: |f3| / f≥0.8. This configuration allows the third lens group G3 to handle a smaller optical power, thus reducing the divergence of light rays passing through the optical path folding element group 2. This means the light rays do not need to travel a long distance within the optical lens 100 to converge into an image, which helps to shorten the overall length of the optical lens 100 and consequently reduces the size of the camera module 400.

[0404] In some embodiments, such as Figure 22a and Figure 22b As shown, the effective focal length f of the optical lens 100 is 31.8mm, and the aperture number Fno is 3.52.

[0405] The following section discusses specific parameters. Figure 22a as well as Figure 22b The optical lens 100 shown will be described in detail.

[0406] As shown in Tables 6.1 and 6.2, Table 6.1 shows the main parameters of the optical lens 100 in the thirteenth embodiment of this application, and Table 6.2 shows the aspherical coefficients of each surface of the optical element of the optical lens 100 in the thirteenth embodiment of this application.

[0407] Table 6.1

[0408]

[0409] The units for the radius of curvature and thickness parameters in Table 6.1 are all mm.

[0410] OBJ represents the object plane, i.e. the subject of the photograph; S1 (STO) represents the aperture stop; S1 represents the object-side surface of lens L11; S2 represents the image-side surface of lens L11; S3 represents the object-side surface of lens L12; S4 represents the image-side surface of lens L12; S5 represents the object-side surface of lens L13; S6 represents the image-side surface of lens L13; S7 represents the object-side surface of lens L14; and S8 represents the image-side surface of lens L14.

[0411] PRISM1 represents the first optical path folding element 3, which is a triple-reflection prism with light folding function. S9 represents the first incident surface 31 of the first optical path folding element 3. S10 represents the second surface 34 of the first optical path folding element 3. S11 represents the first incident surface 31 of the first optical path folding element 3. S12 represents the first surface 33 of the first optical path folding element 3. S13 represents the first exit surface 32 of the first optical path folding element 3.

[0412] PRISM2 represents the second optical path folding element 4, which is a secondary reflection prism with light folding function. S14 represents the second incident surface 41 of the second optical path folding element 4, S15 represents the second exit surface 42 of the second optical path folding element 4, S16 represents the fourth surface 44 of the second optical path folding element 4, and S17 represents the second exit surface 42 of the second optical path folding element 4.

[0413] S18 represents the object-side surface of lens L31, and S19 represents the image-side surface of lens L31.

[0414] IRCF represents an infrared filter, S20 is the object-side surface of the filter, and S21 is the image-side surface of the filter.

[0415] Table 6.2

[0416]

[0417]

[0418] For details regarding the other structures of the camera module 400 in this embodiment, please refer to [reference needed]. Figure 20a , Figure 20b The camera module 400 shown is configured as described above, and will not be described in detail here.

[0419] The types of cross-sectional lines in the accompanying drawings are for distinguishing different components and should not be construed as limiting the materials of the components. The accompanying drawings are for illustrating structural composition and are not shown to scale of the actual product.

[0420] While the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may arise based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0421] In the embodiments of this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature.

[0422] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0423] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "upper," "lower," "left," "right," "inner," and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. "Multiple" refers to at least two.

[0424] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0425] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An optical lens, characterized in that, It includes a first lens group (G1), a first optical path folding element (3), and a second optical path folding element (4) arranged along the object side to the image side. The first optical path folding element (3) and the second optical path folding element (4) constitute an optical path folding element group (2). The first lens group (G1) has positive optical power; There is a gap (5) between the first optical path folding element (3) and the second optical path folding element (4). The first optical path folding element (3) is used to reflect the light passing through the first lens group (G1) at least once and shoot it into the gap (5); the second optical path folding element (4) is used to reflect the light passing through the gap (5) at least once and shoot it out of the second optical path folding element (4). A refractive part (6) is provided at the position of the gap (5). The refractive part (6) has negative optical power and is located on the optical path of the optical path folding element group (2). The effective focal length f2 of the refractive part (6) and the effective focal length f of the optical lens satisfy: |f2| / f≥0.

7.

2. The optical lens according to claim 1, characterized in that, The total length TTL of the optical lens and the effective focal length f of the optical lens satisfy: TTL / f≥0.

8.

3. The optical lens according to claim 1 or 2, characterized in that, The length L1 of the first optical path folding element (3) after unfolding is satisfied with the effective focal length f of the optical lens: 0.3≤L1 / f≤0.

7.

4. The optical lens according to any one of claims 1 to 3, characterized in that, The distance d between the image principal plane of the refractive part (6) and the image principal plane of the first lens group (G1) and the total length TTL of the optical lens satisfy: 0.3≤d / TTL≤0.

7.

5. The optical lens according to any one of claims 1 to 4, characterized in that, The effective focal length f2 of the refractive part (6) and the effective focal length f of the optical lens satisfy: |f2| / f≤4.

6. The optical lens according to any one of claims 1 to 5, characterized in that, The refractive part (6) includes at least one of a first exit surface (32) and a second incident surface (41). The first exit surface (32) is the exit surface of the first optical path folding element (3), and the second incident surface (41) is the incident surface of the second optical path folding element (4). The gap (5) is located between the first exit surface (32) and the second incident surface (41).

7. The optical lens according to claim 6, characterized in that, The refractive part (6) includes a second incident surface (41), the optical power of the second incident surface (41) is negative, and the optical power of the first exit surface (32) is 0. The width d of the gap (5) gap The effective focal length f of the optical lens satisfies: d gap ≤f / 10; and / or, the refractive index n of the medium within the gap (5) gap It is less than the refractive index n of the second optical path folding element (4).

8. The optical lens according to claim 6, characterized in that, The refractive part (6) includes a first exit surface (32) and a second incident surface (41). Both the first exit surface (32) and the second incident surface (41) have optical power, and the combined optical power of the first exit surface (32) and the second incident surface (41) is negative.

9. The optical lens according to claim 8, characterized in that, The first exit surface (32) bends away from the second incident surface (41), and the second incident surface (41) bends towards the first exit surface (32). Alternatively, the first exit surface (32) bends toward the side closer to the second incident surface (41), and the second incident surface (41) bends toward the side farther from the first exit surface (32).

10. The optical lens according to claim 8 or 9, characterized in that, One of the first exit surface (32) and the second incident surface (41) is a spherical surface, and the other of the first exit surface (32) and the second incident surface (41) is an aspherical surface; Alternatively, both the first exit surface (32) and the second incident surface (41) may be spherical or aspherical.

11. The optical lens according to any one of claims 1 to 5, characterized in that, The refractive part (6) includes a second lens group (G2), which is disposed in the gap (5). The second lens group (G2) has negative optical power and includes at least one lens.

12. The optical lens according to any one of claims 1 to 11, characterized in that, The first lens group (G1) is a focusing lens group. When the optical lens is focusing, the first lens group (G1) moves along the optical axis (11) of the first lens group (G1). The first lens group (G1) is also an image stabilization lens group. When the optical lens is stabilizing, the first lens group (G1) moves in a direction perpendicular to the optical axis (11) of the first lens group (G1).

13. The optical lens according to claim 12, characterized in that, At the position of the optical axis of the optical lens, the ΔMTF of the optical lens satisfies: ΔMTF < 0.1; At positions other than the optical axis of the optical lens, the ΔMTF of the optical lens satisfies: ΔMTF < 0.25; Wherein, ΔMTF=MTF0-MTF1, MTF0 is the MTF value of the optical lens when the optical lens is stationary relative to the object being photographed, at a spatial frequency of 1 / 4 of the Nyquist frequency of the photosensitive element (200); MTF1 is the MTF value of the optical lens when the optical lens is stabilized, at a spatial frequency of 1 / 4 of the Nyquist frequency of the image sensor (200).

14. The optical lens according to any one of claims 1 to 13, characterized in that, The first optical path folding element (3) is a multi-reflection prism, and includes a first incident surface (31) and a first surface (33) arranged in a first direction (Z), and a first exit surface (32) and a second surface (34) arranged in a second direction (Y); wherein, the first direction (Z) is parallel to the optical axis (11) of the first lens group (G1), and the second direction (Y) is perpendicular to the first direction (Z); The first incident surface (31) is a total reflection surface, the second surface (34) is a reflection surface, and the first exit surface (32) and the second surface (34) are both inclined relative to the first direction (Z); The second optical path folding element (4) is a prism, and includes a third surface (43) and a fourth surface (44) arranged along the first direction (Z), and a second incident surface (41) and a second exit surface (42) arranged along the second direction (Y); The second incident surface (41) is disposed facing the first exit surface (32), and at least one of the third surface (43) and the fourth surface (44) is a total reflection surface. Both the second incident surface (41) and the second exit surface (42) are disposed at an angle relative to the first direction (Z).

15. The optical lens according to claim 14, characterized in that, Along the first direction (Z), the fourth surface (44) is located on the side of the second optical path folding element (4) away from the first lens group (G1); The angle between the first incident surface (31) and the second surface (34) is θ, the angle between the first exit surface (32) and the first surface (33) is 2θ, the angle between the second incident surface (41) and the third surface (43) is 2θ, and the angle between the second exit surface (42) and the fourth surface (44) is 2θ. Alternatively, the angle between the first incident surface (31) and the second surface (34) is θ, the angle between the first exit surface (32) and the first surface (33) is 2θ, the angle between the second incident surface (41) and the third surface (43) is 2θ, and the angle between the second exit surface (42) and the third surface (43) is 2θ. Alternatively, the angle between the first incident surface (31) and the second surface (34) is θ, the angle between the first exit surface (32) and the first incident surface (31) is 2θ, the angle between the second incident surface (41) and the fourth surface (44) is 2θ, and the angle between the second exit surface (42) and the fourth surface (44) is 2θ.

16. The optical lens according to any one of claims 1 to 13, characterized in that, The first optical path folding element (3) is a multi-reflection prism, and includes a first incident surface (31) and a first surface (33) arranged along a first direction (Z), and a first exit surface (32) and a second surface (34) arranged along a second direction (Y); wherein, the first direction (Z) is parallel to the optical axis of the first lens group (G1), and the second direction (Y) is perpendicular to the first direction (Z); The first incident surface (31) is a total reflection surface, the second surface (34) is a reflection surface, and the first exit surface (32) and the second surface (34) are both inclined relative to the first direction (Z); The second optical path folding element (4) is a multi-reflection prism, and includes a second exit surface (42) and a third surface (43) arranged along the first direction (Z), and a second incident surface (41) and a fourth surface (44) arranged along the second direction (Y); The second incident surface (41) is disposed facing the first exit surface (32), the second exit surface (42) is a total reflection surface, the fourth surface (44) is a reflection surface, and both the second incident surface (41) and the fourth surface (44) are disposed at an angle relative to the first direction (Z).

17. The optical lens according to claim 16, characterized in that, Along the first direction (Z), the second exit surface (42) is located on the side of the second optical path folding element (4) close to the first lens group (G1); the angle between the first incident surface (31) and the second surface (34) is θ, the angle between the first exit surface (32) and the first surface (33) is 2θ, the angle between the second incident surface (41) and the second exit surface (42) is 2θ, and the angle between the second exit surface (42) and the fourth surface (44) is θ; Alternatively, along the first direction (Z), the second exit surface (42) is located on the side of the second optical path folding element (4) away from the first lens group (G1); the angle between the first incident surface (31) and the second surface (34) is θ, the angle between the first incident surface (31) and the first exit surface (32) is 2θ, the angle between the second incident surface (41) and the second exit surface (42) is 2θ, and the angle between the second exit surface (42) and the fourth surface (44) is θ.

18. The optical lens according to claim 15 or 17, characterized in that, θ satisfies: 22°≤θ≤40°.

19. The optical lens according to any one of claims 1 to 18, characterized in that, The optical lens satisfies at least one of the following relationships: FOV≤20°; Fno≤4.5; ImgH ≥ 3mm; Wherein, FOV is the field of view of the optical lens; Fno is the aperture number of the optical lens; and ImgH is the image height of the optical lens.

20. The optical lens according to any one of claims 1 to 19, characterized in that, The optical lens also includes a third lens group (G3), which has optical power and is located on the image side of the second optical path folding element (4). The third lens group (G3) includes at least one lens.

21. A camera module, characterized in that, It includes a photosensitive element (200) and an optical lens (100) according to any one of claims 1 to 20, wherein the photosensitive element (200) is disposed on the image side of the optical lens (100).

22. An electronic device, characterized in that, It includes a housing (500) and a camera module (400) as claimed in claim 21, the camera module (400) being mounted on the housing (500).

Images