Optical lens, lens module and electronic equipment

Abstract

The invention provides an optical lens, a lens module and electronic equipment, the optical lens comprises a first lens group, a first prism, a second lens group and a second prism which are sequentially arranged from an object side to an image side, and the first lens group has positive focal power and is used for receiving light rays and converging the light rays; the first prism comprises a first incident plane, a first reflecting plane and a first emergent plane, a first included angle between the first incident plane and the first reflecting plane is smaller than 45 degrees, and the optical axis of the first emergent plane coincides with the optical axis of the second lens group; the second lens group has negative focal power; the second prism comprises a second incident plane, a second reflecting plane and a second emergent plane, a second included angle between the second reflecting plane and the second emergent plane is smaller than 45 degrees, the first included angle is equal to the second included angle, and the optical axis of the second incident plane coincides with the optical axis of the second lens group. According to the optical lens, the second lens group is arranged between the first prism and the second prism, so that the optical lens has relatively high focusing capability and macro effect and relatively high imaging quality.

Description

Technical Field

[0001] This application relates to the field of lenses, and more specifically, to an optical lens, a lens module, and an electronic device. Background Art

[0002] With the continuous development of electronic devices, the camera function has become an important feature of electronic devices and a main indicator for evaluating the performance of electronic devices. However, during the shooting process of current lens modules, the lens usually requires a large focusing stroke to achieve focusing, and the movement of the lens position will also cause a sharp change in the system aberration. Compared with distant objects, there is obvious image quality deterioration at close distances (for example, 2 m). Therefore, the focusing ability of the lens is weak and the imaging quality is poor. Summary of the Invention

[0003] This application provides an optical lens, a lens module, and an electronic device, which can have strong focusing ability and high imaging quality.

[0004] In a first aspect, an optical lens is provided, which includes a first lens group, a first prism, a second lens group, and a second prism arranged in sequence from the object side to the image side. The first lens group includes at least one lens, the first lens group has a positive optical power, and the first lens group is used to receive light and converge the light; the first prism includes a first incident surface, a first reflection surface, and a first exit surface, and the first angle between the first incident surface and the first reflection surface is less than 45°, and the optical axis of the first exit surface coincides with the optical axis of the second lens group; the second lens group includes at least one lens, and the second lens group has a negative optical power; the second prism includes a second incident surface, a second reflection surface, and a second exit surface, and the second angle between the second reflection surface and the second exit surface is less than 45°, and the second angle is equal to the first angle, and the optical axis of the second incident surface coincides with the optical axis of the second lens group.

[0005] In the embodiments of this application, by arranging the second lens group between the first prism and the second prism, and separating the first lens group and the second lens group, the optical lens has strong focusing ability, can not only perform long-distance shooting, but also shoot close scenes (for example, macro scenes), has high imaging quality, and high imaging clarity. In addition, by setting both the first angle of the first prism and the second angle of the second prism to be less than 45°, the design of large aperture, large target surface, and small volume of the optical lens can be realized.

[0006] In addition, the embodiments of the present application adopt a coaxial system. That is to say, the optical axis of the first exit surface of the first prism coincides with the optical axis of the second lens group, and the optical axis of the second entrance surface of the second prism coincides with the optical axis of the second lens group. By using a coaxial system for the optical lens, compared with an off-axis system, off-axis aberrations will not occur. The prisms and lenses in the coaxial system can both adopt a centrosymmetric structure, which is convenient for production and manufacturing and has strong feasibility. In addition, compared with an off-axis system, it is easier to find the center point of the prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0007] In a possible implementation manner, the first lens group may include three lenses (such as the first lens L1, the second lens L2, and the third lens L3), and the second lens group may include two lenses (such as the fourth lens L4 and the fifth lens L5). In an example, L1 may have a positive optical power, and at least one of L2 and L3 has a negative optical power. It should be understood that with this setting method, it is beneficial for the optical lens to correct aberrations, thereby having better imaging quality. It should be understood that from the perspective of engineering implementation, a design in which L1 has a positive optical power, L2 has a positive optical power, and L3 has a negative optical power can be adopted.

[0008] Exemplarily, L4 has a positive optical power and L5 has a negative optical power, or L4 has a negative optical power and L5 has a positive optical power, and the overall of L4 and L5 (i.e., the second lens group) has a negative optical power. In this example, by setting the optical powers of the two lenses in the second lens group to be one positive and one negative, it is beneficial for aberration correction, so that the optical lens has better imaging quality.

[0009] In another possible implementation manner, the first lens group may include two lenses (such as the first lens L1 and the second lens L2), and the second lens group may include three lenses (such as the third lens L3, the fourth lens L4, and the fifth lens L5). In an example, L1 may have a positive optical power, L2 may have a negative optical power, and the overall of L1 and L2 (i.e., the first lens group) has a positive optical power. In this example, by setting L1 to have a positive optical power and L2 to have a negative optical power, it is beneficial to control the aberration of the light beam passing through the first lens group, making it easier for the first lens group to correct aberrations, and the optical lens has better imaging quality. In other examples, L1 may have a positive optical power, and L2 may also have a positive optical power. The present application does not limit this.

[0010] In this implementation, at least one of the three lenses in the second lens group has a positive optical power, and at least one has a negative optical power. The specific optical powers of L3, L4, and L5 are not limited. For example, L3 can have a positive optical power, L4 can have a negative optical power, and L5 can have a negative optical power (or a positive optical power), and the overall combination of L3, L4, and L5 (i.e., the second lens group) has a negative optical power.

[0011] In this implementation, compared with the solution where the first lens group includes three lenses, setting two lenses in the first lens group can, on the one hand, correct aberrations well, and on the other hand, reduce the size of the optical lens.

[0012] It should be understood that the entire optical lens has a positive optical power, that is, it converges the light beam. That is to say, the overall combination of the first lens group and the second lens group has a positive optical power, that is, the absolute value of the optical power of the first lens group is greater than the absolute value of the optical power of the second lens group.

[0013] Combined with the first aspect, in some implementations of the first aspect, the first included angle θ1 and the refractive index n1 of the first prism satisfy: n1 ≥ 1 / sin(2*θ1).

[0014] Exemplarily, the value of the first included angle is related to the refractive index of the first prism, and the value of the first included angle can be between 22° and 28°.

[0015] It should be understood that by setting the relationship between the first included angle and the refractive index of the first prism, total internal reflection can occur on the first incident surface of the first prism, that is, transmission and total internal reflection can occur on the first incident surface.

[0016] Combined with the first aspect, in some implementations of the first aspect, the second included angle θ2 and the refractive index n2 of the second prism satisfy: n2 ≥ 1 / sin(2*θ2).

[0017] Exemplarily, the value of the second included angle is related to the refractive index of the second prism, and the second included angle is equal to the first included angle, and the value of the second included angle can also be between 22° and 28°.

[0018] It should be understood that by setting the relationship between the second included angle and the refractive index of the second prism, total internal reflection can occur on the second exit surface of the second prism, that is, transmission and total internal reflection can occur on the second exit surface.

[0019] Combined with the first aspect, in some implementations of the first aspect, the first lens group is a movable lens group, and during the focusing process of the optical lens from a long shot to a close shot, the first lens group moves axially towards the object side.

[0020] In this implementation, during the focusing process of the optical lens, the first lens group can be moved, so that the optical lens has a better macro effect and high-quality imaging with a long focusing stroke.

[0021] Combined with the first aspect, in some implementations of the first aspect, the first lens group includes at least one variable lens. During the focusing process of the optical lens switching from a long-distance view to a close-up view, the optical power of the variable lens in the first lens group increases.

[0022] It should be understood that a variable lens refers to a lens whose lens surface shape can be changed by driving methods such as electricity, sound, or magnetism.

[0023] For the optical lens provided in this application, since the first lens group includes at least one variable lens, a closer focusing object distance can be achieved without moving the first lens group (i.e., while keeping the total height of the system unchanged).

[0024] Combined with the first aspect, in some implementations of the first aspect, the second lens group includes at least one variable lens, and the variable lens in the second lens group is used to correct the additional aberration brought by the variable lens in the first lens group.

[0025] Exemplarily, during the focusing process of the optical lens switching from a long-distance view to a close-up view, the optical power of the variable lens in the second lens group decreases.

[0026] Combined with the first aspect, in some implementations of the first aspect, the first exit surface is a plane, the second lens group includes a first lens, the object side surface of the first lens is a plane, and the first lens is fixedly connected to the first exit surface of the first prism by a gluing process.

[0027] For the optical lens provided in this application, the lens in the second lens group can be glued to the first exit surface of the first prism, so that the first exit surface of the first prism has optical power. Compared with an integrally formed first prism with optical power, this method is simpler in processing and manufacturing and can improve the production efficiency of the first prism.

[0028] Combined with the first aspect, in some implementations of the first aspect, the second entrance surface is a plane, the second lens group includes a second lens, the image side surface of the second lens is a plane, and the second lens is fixedly connected to the second entrance surface of the second prism by a gluing process.

[0029] For the optical lens provided in this application, the lens in the second lens group can be glued to the second entrance surface of the second prism, so that the second entrance surface of the second prism has optical power. Compared with an integrally formed second prism with optical power, this method is simpler in processing and manufacturing and can improve the production efficiency of the second prism.

[0030] In combination with the first aspect, in some implementations of the first aspect, the second lens group may include a first lens and a second lens. The first prism may be glued to the first lens in the second lens group to form a surface with optical power, and the second prism may also be glued to the second lens in the second lens group to form a surface with optical power.

[0031] In combination with the first aspect, in some implementations of the first aspect, the optical lens further includes an aperture stop. The aperture stop is located on the object side of the first lens group, or the aperture stop is located between the first lens group and the first prism, or the aperture stop is located between the first prism and the second lens group, or the aperture stop is located between the second lens group and the second prism.

[0032] The optical lens provided in this application may also be provided with an aperture stop, and the position of the aperture stop can be set according to actual needs to better adjust the aperture and filter out stray light, thereby improving the imaging quality of the optical lens. In addition, by setting the aperture stop on the object side of the first lens group, the total system height of the optical lens can also be reduced.

[0033] In combination with the first aspect, in some implementations of the first aspect, the optical lens further includes an infrared filter, and the infrared filter is located on the image side of the second prism.

[0034] Exemplarily, in some implementations, an infrared cut-off film layer may be provided on the surface of the second exit surface of the second prism.

[0035] The optical lens provided in this application may also be provided with an infrared filter or an infrared cut-off film layer to filter out unwanted optical signals.

[0036] In combination with the first aspect, in some implementations of the first aspect, the optical lens further includes a third lens group. The third lens group includes at least one lens, and the third lens group is located on the image side of the second prism. Exemplarily, the third lens group may be located between the second prism and the infrared filter.

[0037] Exemplarily, the first lens group may include a first lens with positive optical power; the second lens group may include a second lens with negative optical power; the third lens group may include a third lens, and the third lens may have positive or negative optical power.

[0038] It should be understood that the entire optical lens has positive optical power, that is, it has a converging effect on the light beam. That is to say, the overall formed by the first lens group, the second lens group and the third lens group has positive optical power.

[0039] In a second aspect, an optical lens is provided, which includes a first lens group, a first prism, and a second prism arranged in sequence from the object side to the image side. The first lens group includes at least one lens, the first lens group has a positive optical power, and the first lens group is configured to receive light rays and converge the light rays. The first prism includes a first incident surface, a first reflection surface, and a first exit surface, and a first angle between the first incident surface and the first reflection surface is less than 45°. The second prism includes a second incident surface, a second reflection surface, and a second exit surface, and a second angle between the second reflection surface and the second exit surface is less than 45°, and the second angle is the same as the first angle. An optical axis of the second incident surface coincides with an optical axis of the first exit surface. Wherein, the first exit surface has an optical power, the second incident surface has an optical power, and the optical power of the second incident surface is opposite to the optical power of the first exit surface, and an overall formed by the first prism and the second prism has a negative optical power.

[0040] For the optical lens provided in this application, by setting the exit surface of the first prism and the incident surface of the second prism as surfaces with optical power, the optical lens has a strong focusing ability, can not only perform long-distance shooting, but also can shoot close scenes (for example, macro scenes), has a high imaging quality, and high imaging clarity. In addition, by setting both the first angle of the first prism and the second angle of the second prism to be less than 45°, a design of large aperture, large target surface, and small volume of the optical lens can be achieved.

[0041] It should be understood that the optical lens provided in this application adopts a coaxial system, that is to say, the optical axis of the second incident surface coincides with the optical axis of the first exit surface. By using a coaxial system for the optical lens, compared with an off-axis system, off-axis aberrations will not be generated. Prisms and lenses in the coaxial system can all adopt a centrosymmetric structure, which is convenient for production and manufacturing, and has strong feasibility. In addition, compared with an off-axis system, it is easier to find the center point of prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0042] Exemplarily, the first lens group may include four lenses, such as a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. Among them, L1 has a positive optical power, and at least one of L2, L3, and L4 has a negative optical power. It should be understood that through this setting method, it is beneficial for the optical lens to correct aberrations, so as to have better imaging quality.

[0043] Combined with the second aspect, in some implementation manners of the second aspect, the first angle θ1 and the refractive index n1 of the first prism satisfy: n1≥1 / sin(2*θ1).

[0044] Exemplarily, the value of the first included angle is related to the refractive index of the first prism, and the value of the first included angle can be between 22° and 28°.

[0045] It should be understood that by setting the relationship between the first included angle and the refractive index of the first prism, total internal reflection can occur on the first incident surface of the first prism, that is, transmission and total internal reflection can occur on the first incident surface.

[0046] Combined with the second aspect, in some implementation manners of the second aspect, the second included angle θ2 and the refractive index n2 of the second prism satisfy: n2 ≥ 1 / sin(2*θ2).

[0047] Exemplarily, the value of the second included angle is related to the refractive index of the second prism, and the second included angle is equal to the first included angle, and the value of the second included angle can also be between 22° and 28°.

[0048] It should be understood that by setting the relationship between the second included angle and the refractive index of the second prism, total internal reflection can occur on the second exit surface of the second prism, that is, transmission and total internal reflection can occur on the second exit surface.

[0049] Combined with the second aspect, in some implementation manners of the second aspect, the first lens group is a movable lens group, and during the focusing process of the optical lens switching from a long shot to a close shot, the first lens group moves axially toward the object side.

[0050] In this implementation manner, during the focusing process of the optical lens, the first lens group can be moved, so that the optical lens has a better macro effect and high-quality imaging with a long focusing stroke.

[0051] Combined with the second aspect, in some implementation manners of the second aspect, the first lens group includes at least one variable lens, and during the focusing process of the optical lens switching from a long shot to a close shot, the optical power of the variable lens in the first lens group increases.

[0052] It should be understood that a variable lens refers to a lens whose lens surface type can be changed by driving methods such as electricity, sound, or magnetism.

[0053] For the optical lens provided in this application, the first lens group includes at least one variable lens. Therefore, a closer focusing object distance can be achieved without moving the first lens group (i.e., while keeping the total height of the system unchanged).

[0054] Combined with the second aspect, in some implementation manners of the second aspect, the optical lens further includes a first lens, and the first lens is fixedly connected to the first exit surface by a gluing process to form a surface with optical power.

[0055] The optical lens provided by the present application can adopt the method of gluing the first lens and the first prism, so that the first exit surface of the first prism has a focal power. Compared with the integrally formed first prism with a focal power, this method is simpler in processing and production, and can improve the production efficiency of the first prism.

[0056] Combined with the second aspect, in some implementation manners of the second aspect, the optical lens further includes a second lens, and the second lens is fixedly connected to the second incident surface through a gluing process to form a surface with a focal power.

[0057] The optical lens provided by the present application can adopt the method of gluing the second lens and the second prism, so that the second incident surface of the second prism has a focal power. Compared with the integrally formed second prism with a focal power, this method is simpler in processing and production, and can improve the production efficiency of the second prism.

[0058] Combined with the second aspect, in some implementation manners of the second aspect, the first prism and / or the second prism is a prism with a focal power formed by integral processing. That is to say, the first prism and / or the second prism can be formed by an integral molding processing method, and at least one surface of the formed prism is a surface with a focal power.

[0059] Combined with the second aspect, in some implementation manners of the second aspect, the optical lens further includes an aperture stop, and the aperture stop is located on the object side of the first lens group, or the aperture stop is located between the first lens group and the first prism, or the aperture stop is located between the first prism and the second prism.

[0060] The optical lens provided by the present application can also be provided with an aperture stop, and the position of the aperture stop can be set according to actual needs to better adjust the aperture and filter out stray light, thereby improving the imaging quality of the optical lens. In addition, by arranging the aperture stop on the object side of the first lens group, the overall height of the optical lens system can also be reduced.

[0061] Combined with the second aspect, in some implementation manners of the second aspect, the optical lens further includes an infrared filter, and the infrared filter is located on the image side of the second prism.

[0062] Exemplarily, in some implementation manners, an infrared cut-off film layer can be provided on the surface of the second exit surface of the second prism.

[0063] The optical lens provided by the present application can also be provided with an infrared filter or an infrared cut-off film layer to filter out unnecessary optical signals.

[0064] In combination with the second aspect, in some implementations of the second aspect, the optical lens further includes a third lens group, the third lens group includes at least one lens, and the third lens group is located on the image side of the second prism. Exemplarily, the third lens group may be located between the second prism and the infrared filter.

[0065] Exemplarily, the third lens group may include a third lens, the third lens may have a positive or negative optical power, and the third lens group can be used to further correct aberrations.

[0066] In a third aspect, an optical lens is provided, which includes a first lens group, a first prism, a second lens group, and a third prism arranged in sequence from the object side to the image side. The first lens group includes at least one lens, the first lens group has a positive optical power, and the first lens group is used to receive light and converge the light; the first prism includes a first incident surface, a first reflection surface, and a first exit surface, and the first angle between the first incident surface and the first reflection surface is less than 45°, and the optical axis of the first exit surface coincides with the optical axis of the second lens group; the second lens group includes at least one lens, and the second lens group has a negative optical power; the third prism includes a third incident surface, a third reflection surface, and a third exit surface, the angle between the third incident surface and the third reflection surface is equal to the angle between the third exit surface and the third reflection surface, and the third angle formed between the third incident surface and the third reflection surface is twice the first angle, the third angle is less than 90° and greater than 40°, and the optical axis of the third incident surface coincides with the optical axis of the second lens group.

[0067] Among them, the first prism can be configured to fold the optical axis of the optical system twice, and the third prism can be configured to fold the optical axis of the optical system three times.

[0068] In the embodiments of the present application, by arranging the second lens group between the first prism and the third prism, and separating the first lens group and the second lens group, the optical lens has a strong focusing ability, can not only perform long-distance shooting, but also can shoot close scenes (for example, macro scenes), has a high imaging quality, and high imaging clarity. In addition, by setting the angle between the third incident surface and the third reflection surface to be equal to the angle between the third exit surface and the third reflection surface, and the third angle formed between the third incident surface and the third reflection surface to be twice the first angle, the light can be reflected three times in the third prism, the optical path is folded more times in the third prism, the space utilization rate is higher, and it is more conducive to the design of a telephoto lens. In addition, when the light incident on the third prism is reflected for the second time, the light turns upward, which can lift the optical axis of the light exiting from the third prism, thereby further reducing the length of the optical system.

[0069] It should be understood that the embodiments of the present application adopt a coaxial system. That is to say, the optical axis of the first exit surface of the first prism coincides with the optical axis of the second lens group, and the optical axis of the third entrance surface of the third prism coincides with the optical axis of the second lens group. By using the coaxial system, the optical lens will not generate off-axis aberrations compared with the off-axis system. The prisms and lenses in the coaxial system can all adopt a centrosymmetric structure, which is convenient for production and manufacturing and has strong feasibility. In addition, compared with the off-axis system, it is easier to find the center point of the prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0070] In a possible implementation manner, the first lens group may include three lenses (such as the first lens L1, the second lens L2, and the third lens L3), and the second lens group may include two lenses (such as the fourth lens L4 and the fifth lens L5). In an example, L1 may have a positive optical power, and at least one of L2 and L3 has a negative optical power. It should be understood that with this setting method, it is beneficial for the optical lens to correct aberrations, so as to have better imaging quality. It should be understood that from the perspective of engineering implementation, a design in which L1 has a positive optical power, L2 has a positive optical power, and L3 has a negative optical power can be adopted.

[0071] Exemplarily, L4 has a positive optical power and L5 has a negative optical power, or L4 has a negative optical power and L5 has a positive optical power, and the overall of L4 and L5 (i.e., the second lens group) has a negative optical power. In this example, by setting the optical powers of the two lenses in the second lens group to be one positive and one negative, it is beneficial to correct aberrations, so that the optical lens has better imaging quality.

[0072] In a possible implementation manner, the first lens group may include two lenses (such as the first lens L1 and the second lens L2), and the second lens group may include three lenses (such as the third lens L3, the fourth lens L4, and the fifth lens L5). In an example, L1 may have a positive optical power, L2 may have a negative optical power, and the overall of L1 and L2 (i.e., the first lens group) has a positive optical power. In this example, by setting L1 to have a positive optical power and L2 to have a negative optical power, it is beneficial to control the aberrations of the light beam passing through the first lens group, making it easier for the first lens group to correct aberrations, and the optical lens has better imaging quality. In other examples, L1 may have a positive optical power, and L2 may also have a positive optical power. The present application does not limit this.

[0073] In this implementation, at least one of the three lenses in the second lens group has a positive focal power, and at least one has a negative focal power. The specific focal powers of L3, L4, and L5 are not limited. For example, L3 can have a positive focal power, L4 can have a negative focal power, and L5 can have a negative focal power (or a positive focal power), and the overall formed by L3, L4, and L5 (i.e., the second lens group) has a negative focal power.

[0074] In this implementation, compared with the solution where the first lens group includes three lenses, setting two lenses in the first lens group can, on the one hand, well correct aberrations, and on the other hand, can also reduce the size of the optical lens.

[0075] It should be understood that the entire optical lens has a positive focal power, that is, it has a converging effect on the light beam. That is to say, the overall formed by the first lens group and the second lens group has a positive focal power, that is, the absolute value of the focal power of the first lens group is greater than the absolute value of the focal power of the second lens group.

[0076] Combined with the third aspect, in some implementations of the third aspect, the first included angle θ1 and the refractive index n1 of the first prism satisfy: n1≥1 / sin(2*θ1).

[0077] Exemplarily, the value of the first included angle is related to the refractive index of the first prism, and the value of the first included angle can be between 22° and 28°.

[0078] It should be understood that by setting the relationship between the first included angle and the refractive index of the first prism, total internal reflection can occur on the first incident surface of the first prism, that is, transmission and total internal reflection can occur on the first incident surface.

[0079] Combined with the third aspect, in some implementations of the third aspect, the first lens group is a movable lens group, and during the focusing process of the optical lens switching from a long shot to a close shot, the first lens group moves axially toward the object side.

[0080] In this implementation, during the focusing process of the optical lens, the first lens group can be moved, so that the optical lens has a better macro effect and high-quality imaging with a long focusing stroke.

[0081] Combined with the third aspect, in some implementations of the third aspect, the first lens group includes at least one variable lens, and during the focusing process of the optical lens switching from a long shot to a close shot, the focal power of the variable lens in the first lens group increases.

[0082] It should be understood that a variable lens refers to a lens whose lens surface shape can be changed by driving methods such as electricity, sound, or magnetism.

[0083] The optical lens provided by the present application, the first lens group includes at least one variable lens. Therefore, it is possible to achieve a closer focusing object distance without moving the first lens group (i.e., while keeping the total height of the system unchanged).

[0084] Combined with the third aspect, in some implementation manners of the third aspect, the second lens group includes at least one variable lens, and the variable lens in the second lens group is used to correct the additional aberration brought by the variable lens in the first lens group.

[0085] Exemplarily, during the focusing process of the optical lens switching from a long shot to a close shot, the optical power of the variable lens in the second lens group decreases.

[0086] Combined with the third aspect, in some implementation manners of the third aspect, the first exit surface is a plane, the second lens group includes a first lens, the object side surface of the first lens is a plane, and the first lens is fixedly connected to the first exit surface of the first prism by a gluing process.

[0087] The optical lens provided by the present application can glue the lens in the second lens group to the first exit surface of the first prism, so that the first exit surface of the first prism has optical power. Compared with the integrally formed first prism with optical power, this method is simpler in processing and manufacturing and can improve the production efficiency of the first prism.

[0088] Combined with the third aspect, in some implementation manners of the third aspect, the optical lens further includes an aperture stop, and the aperture stop is located on the object side of the first lens group, or the aperture stop is located between the first lens group and the first prism, or the aperture stop is located between the first prism and the second lens group, or the aperture stop is located between the second lens group and the third prism.

[0089] The optical lens provided by the present application can also be provided with an aperture stop, and the position of the aperture stop can be set according to actual needs to better adjust the aperture and filter out stray light, thereby improving the imaging quality of the optical lens. In addition, by setting the aperture stop on the object side of the first lens group, the total height of the optical lens system can also be reduced.

[0090] Combined with the third aspect, in some implementation manners of the third aspect, the optical lens further includes an infrared filter, and the infrared filter is located on the image side of the third prism.

[0091] Exemplarily, in some implementation manners, an infrared cut-off film layer can be provided on the surface of the third exit surface of the third prism.

[0092] The optical lens provided by the present application can also be provided with an infrared filter or an infrared cut-off film layer to filter out unnecessary optical signals.

[0093] In combination with the third aspect, in some implementation manners of the third aspect, the optical lens further includes a third lens group, the third lens group includes at least one lens, and the third lens group is located on the image side of the third prism.

[0094] Exemplarily, the third lens group may be located between the third prism and the infrared filter.

[0095] Exemplarily, the first lens group may include a first lens with a positive optical power; the second lens group may include a second lens with a negative optical power; the third lens group may include a third lens, and the third lens may have a positive optical power or a negative optical power.

[0096] It should be understood that the entire optical lens has a positive optical power, that is, it converges the light beam. That is to say, the overall formed by the first lens group, the second lens group and the third lens group has a positive optical power.

[0097] In a fourth aspect, a lens module is provided, which includes an image sensor and the optical lens described in any aspect of the first aspect, or includes an image sensor and the optical lens described in any aspect of the second aspect. The optical lens is configured to image a scene on the object side on the image sensor.

[0098] In a possible implementation manner, the image sensor is located on the image side of the optical lens and is arranged parallel to the second exit surface. In this implementation manner, the image sensor is vertically arranged, that is, the image sensor is perpendicular to the thickness direction of the electronic device.

[0099] In a possible implementation manner, the image sensor is located on the image side of the optical lens and is arranged parallel to the second reflection surface. In this implementation manner, the image sensor is inclined, so that the total height of the system of the electronic device can be reduced to a certain extent.

[0100] In a fifth aspect, a lens module is provided, which includes an image sensor and the optical lens described in any aspect of the third aspect. The optical lens is configured to image a scene on the object side on the image sensor.

[0101] In a possible implementation manner, the image sensor is located on the image side of the optical lens and is arranged parallel to the third exit surface. In this implementation manner, the image sensor is vertically arranged, that is, the image sensor is perpendicular to the thickness direction of the electronic device.

[0102] In a sixth aspect, an electronic device is provided, including an image processor and the lens module described in any aspect of the fourth aspect or the fourth aspect, or including an image processor and the lens module described in any aspect of the fifth aspect or the fifth aspect. The image processor is communicatively connected to the lens module, and the image processor is configured to obtain image data from the lens module and process the image data.

[0103] Among them, the beneficial effects of the fourth aspect to the sixth aspect can refer to the beneficial effects of the first aspect to the third aspect, and will not be repeated here. Description of the Drawings

[0104] Figure 1 is a schematic diagram of an electronic device provided by an embodiment of the present application.

[0105] Figure 2 is a schematic structural diagram of a lens module provided by an embodiment of the present application.

[0106] Figure 3 and Figure 4 is Figure 2 a schematic diagram of the modulation transfer function of the lens module shown at an infinite object distance and at a 200 mm object distance.

[0107] Figure 5 is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0108] Figure 6 and Figure 7 is Figure 5 a schematic diagram of the modulation transfer function of the lens module shown at an infinite object distance and at a 60 mm object distance.

[0109] Figure 8 is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0110] Figure 9 and Figure 10 is Figure 8 a schematic diagram of the modulation transfer function of the lens module shown at an infinite object distance and at a 200 mm object distance.

[0111] Figure 11 is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0112] Figure 12 and Figure 13 is Figure 11 a schematic diagram of the modulation transfer function of the lens module shown at an infinite object distance and at a 200 mm object distance.

[0113] Figure 14It is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0114] Figure 15 and Figure 16 is Figure 14 a schematic diagram of the modulation transfer function of the lens module shown at an infinite object distance and at an object distance of 200 mm.

[0115] Figure 17 It is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0116] Figure 18 It is a schematic structural diagram of another lens module provided by an embodiment of the present application. Detailed implementation manners

[0117] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings.

[0118] The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to limit the present application. In the following embodiments of the present application, "first", "second", and various numerical numbers are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The character " / " generally indicates that the objects before and after are in an "or" relationship. The magnitudes of the serial numbers of the following processes do not mean the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. For example, in the embodiments of the present application, the words such as "10", "20", "30", etc. are only identifiers made for the convenience of description, and do not limit the order of execution steps.

[0119] Referring to "one embodiment" or "some embodiments" described in this embodiment means that specific features, structures, or characteristics described in conjunction with the embodiment are included in one or more embodiments of the present application. In the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, using words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. The terms "include", "comprise", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways. In the embodiments of the present application, descriptions such as "when...", "in the case of...", "if", and "if" all refer to the device making corresponding processing under a certain objective situation, and do not limit the time. Moreover, it does not require the device to have a judgment action when implementing, nor does it mean that there are other limitations.

[0120] For the convenience of understanding, the technical terms involved in this application are explained and described below.

[0121] Lens: A component that uses the refraction principle of a lens to allow the light beam of a scene to pass through the lens and form a clear image on the focal plane.

[0122] Lens group: A combination of one or more lenses. The lens group can move as a whole, or at least one lens in the lens group can move. In this application, the lens group can also be understood as a lens unit or a lens assembly.

[0123] Optical axis: An axis that perpendicularly passes through the center of a lens. The optical axis of a lens is the axis that passes through the centers of all the lenses of the lens. When a light beam parallel to the optical axis enters a convex lens, an ideal convex lens should be such that all the light beams converge at a point behind the lens. This point where all the light beams converge is the focal point.

[0124] Object side, image side: Bounded by the lens, the side where the object to be photographed is located is the object side, and the surface of the lens close to the object side can be called the object side surface; bounded by the lens, the side where the image of the object to be photographed is located is the image side, and the surface of the lens close to the image side can be called the image side surface.

[0125] Focal length: Also known as the focal length, it is a measure of the convergence or divergence of light in an optical system. It refers to the distance from the optical center of a lens or a lens group to the focal point when an infinitely distant scene forms a clear image on the focal plane through the lens or the lens group. It can also be understood as the perpendicular distance from the optical center of the lens or the lens group to the focal plane. From a practical perspective, it can be understood as the distance from the center of the lens to the imaging plane. For a fixed-focus lens, the position of its optical center is fixed; for a lens module, a change in the optical center of the lens brings about a change in the focal length of the lens.

[0126] Focal power: Equal to the difference between the convergence of the image-side light beam and the convergence of the object-side light beam, it characterizes the ability of an optical system to deflect light beams. A lens or a lens group with positive focal power has a positive focal length and has the effect of converging light beams. A lens or a lens group with negative focal power has a negative focal length and has the effect of diverging light beams.

[0127] Diaphragm: Refers to the edge, frame, or specially set perforated barrier of an optical element in an optical component used to limit the size of the imaging light beam or the imaging space unit.

[0128] Aperture stop (STO): It is a diaphragm that limits the maximum inclination angle of the marginal light beam in the imaging light beam of an axial point, that is, the diaphragm with the smallest incident aperture angle.

[0129] Aperture: A device used to control the amount of light that passes through the lens and enters the photosensitive surface of the camera body. It is usually inside the lens. The aperture size is expressed in F / .

[0130] Aperture F value (F#): equal to the focal length of the lens divided by the entrance pupil diameter. If the focal length of the lens remains unchanged, the larger the entrance pupil diameter, the larger the aperture, the smaller the aperture F value, the more light enters, the brighter the picture, and the more blurred the subject and background; on the contrary, the smaller the entrance pupil diameter, the smaller the aperture, the larger the aperture F value, the less light enters, the darker the picture, and the clearer the subject and the front and back are.

[0131] Total track length (TTL): refers to the total length from the lens barrel to the imaging surface, which is the main factor in determining the height of the camera.

[0132] IMH (Image Hight) represents half of the diagonal length of the effective pixel area on the photosensitive chip, that is, the image height of the imaging surface.

[0133] Field of view (FOV): In optical instruments, the angle formed by the two edges of the maximum range through which the image of the object being measured can pass through the lens, with the lens of the optical instrument as the vertex, is called the field of view. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view and the smaller the optical magnification. The shorter the focal length, the wider the horizontal field of view, and the smaller the image. The horizontal field of view becomes narrower as the focal length increases, and the object becomes larger accordingly.

[0134] The Abbe number, also known as the dispersion coefficient, is the difference ratio of the refractive index of an optical material at different wavelengths, representing the degree of dispersion of the material.

[0135] Aberration: The paraxial region of an optical system has the properties of an ideal optical system. The paraxial light beam emitted from a point on the object intersects the image plane at one point. In reality, light beams passing through different apertures of the lens are unlikely to intersect perfectly at one point, but have a certain deviation from the position of the paraxial image point. These differences are collectively called aberrations.

[0136] Meridian plane: The plane formed by the main beam (main beam) of the object point outside the optical axis and the optical axis is called the meridian plane.

[0137] Sagittal plane: The plane passing through the main beam (main beam) of the object point outside the optical axis and perpendicular to the meridian plane is called the sagittal plane.

[0138] The large sensor, large aperture, and high pixel count of mobile phone telephoto lenses are the main trends for the future. A large pixel size can bring a higher full well capacity (i.e., the limit of the number of electrons that a pixel can collect and accommodate), thereby achieving a larger dynamic range; at the same time, it has a lower Nyquist frequency, which can bring better focusing and anti-shake effects. A large aperture can bring a larger light input and a higher diffraction limit.

[0139] Existing telephoto lenses have poor imaging quality in extremely low-light environments, and the focusing performance is limited by the signal-to-noise ratio. To increase the light input and imaging clarity of the lens, larger-aperture lenses and longer and more complex optical paths are required to correct aberration. When the equivalent focal length remains unchanged, the effective focal length corresponding to a large sensor will be longer, so the TTL is also longer, which further increases the volume of the lens. For smartphones, volume is a very large limitation, so in recent years, various methods of using prisms to fold the optical path have emerged (such as the 45° prism scheme). In the existing 45° prism scheme, the size of the prism is limited by the target surface size, and at the same time, it limits the tail height of the entire module. Therefore, the protruding height of the entire module will be very high under a large sensor; and the optical path folding efficiency of such a scheme is low. For a telephoto module with a large sensor, the 45° prism folding scheme still cannot meet the volume requirements of smartphones. Therefore, some special-shaped prism schemes have emerged, breaking the symmetry rule of the 45° prism to achieve a higher folding efficiency, but it is difficult to achieve good macro focusing quality with such schemes.

[0140] Therefore, based on the mobile phone image shooting requirements of large aperture, large target surface, small volume, and high imaging quality, this application provides a large-aperture special-shaped prism refractive telephoto lens, which can be applied to future mobile phones and other small intelligent terminals. By reasonably adjusting the number, optical power, material, and position of each optical element in the lens group, high-quality imaging with a large aperture, large target surface, small volume, and long focusing stroke is achieved.

[0141] It should be noted that the electronic devices involved in the embodiments of this application may include handheld devices, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem. For example, cellular phones, mobile phones, smart phones, tablet computers, laptop computers, laptop computers, cameras, video recorders, cameras, smart watches, smart wristbands, or other devices with photo-taking or video-recording functions in other forms. The embodiments of this application do not place special restrictions on the specific types of electronic devices.

[0142] Figure 1 is a schematic diagram of an electronic device provided by an embodiment of this application. In the embodiments of this application, the electronic device 100 is described by taking a mobile phone as an example.

[0143] The electronic device 100 includes a housing 10, a display screen 20, an image processor 30, and a lens module 40. In some embodiments, the housing 10 includes a frame 101 and a rear cover 102. The frame 101 and the rear cover 102 may be an integrally formed structure or may form an integral structure by an assembly method. The display screen 20 and the rear cover 102 are respectively installed on both sides of the frame 101, jointly enclosing the entire machine inner cavity. The display screen 20 may be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) display screen, etc. Among them, the OLED display screen may be a flexible display screen or a rigid display screen.

[0144] The image processor 30 and the lens module 40 are housed in the entire machine inner cavity. The image processor 30 is communicatively connected to the lens module 40. The image processor 30 is configured to obtain image data from the lens module 40 and process the image data. Among them, the communication connection between the lens module 40 and the image processor 30 may include data transmission through electrical connection means such as wiring, or may be achieved through coupling or other means. It can be understood that the lens module 40 and the image processor 30 may also be communicatively connected through other means capable of realizing data transmission.

[0145] The image processor 30 optimizes the digital image signal and transmits the processed signal to the display. The image processor 30 may be an image processing chip or a digital signal processing chip. Its function is to timely and quickly transfer the data obtained by the photosensitive chip to the central processing unit and refresh the photosensitive chip. Therefore, the quality of the image processor 30 chip directly affects the picture quality (such as color saturation, clarity, etc.).

[0146] The lens module 40 may be only disposed on the front of the electronic device 100 for photographing the scene on one side of the front of the electronic device 100. In some embodiments, it may be called a front lens module; it may also be only disposed on the back of the electronic device 100 for photographing the scene on one side of the back of the electronic device 100. In some embodiments, it may be called a rear lens module; it may also be disposed on the front and back of the electronic device 100. As Figure 1 shown, the lens module 40 is disposed on the front of the electronic device 100, and the lens module 40 is also disposed on the back of the electronic device 100. It can photograph the scene on one side of the front of the electronic device 100 and can also photograph the scene on one side of the back of the electronic device 100, as long as the corresponding lens module is used during photographing.

[0147] It should be understood that the installation position of the lens module 40 is only illustrative. In some embodiments, when the lens module 40 is a front lens module, it can also be installed at other positions on the electronic device 100, such as on the left side of the earpiece, at the middle position of the upper part of the electronic device 100, at the lower part of the electronic device 100, or at the four corners of the electronic device 100; when the lens module 40 is a rear lens module, it can be installed at the middle position of the upper part or the upper right corner of the back of the electronic device 100. In some other embodiments, the lens module 40 can also be not provided on the main body of the electronic device 100, but provided on the edge protruding from the main body of the electronic device 100, or provided on a component that can move or rotate relative to the electronic device 100. For example, the component can extend, retract, or rotate from the main body of the electronic device 100, etc. When the lens module 40 can rotate relative to the electronic device 100, the lens module 40 is equivalent to a front lens module and a rear lens module, that is, by rotating the same lens module 40, the scenes on the front side of the electronic device 100 and the scenes on the back side of the electronic device 100 can be photographed. In some other embodiments, when the display screen 20 can be folded, the lens module 40 can be used as both a front lens module and a rear lens module, and the lens module 40 is used to photograph the scenes on the front side of the electronic device 100 or the scenes on the back side of the electronic device 100 as the display screen 20 is folded.

[0148] The number of lens modules 40 provided in the embodiments of the present application is not limited, and can be one, two, four, or even more. For example, the electronic device 100 can be provided with one or more lens modules 40 on the front side, and can be provided with one or more lens modules 40 on the back side. The embodiments of the present application do not make any limitation on the number of lens modules provided, nor do they make any limitation on the relative positions when multiple lens modules are provided. When multiple lens modules 40 are provided, the multiple lens modules 40 can be exactly the same or different. For example, the number of lenses included in the multiple lens modules 40 is different, or the optical parameters of the lenses are different, or the installation positions of the lenses are different, etc.

[0149] The lens module 40 can be used to shoot videos and / or photos, and can be used to shoot scenes at different distances. For example, the lens module 40 can be used to shoot distant scenes, can be used to shoot near scenes, and can also be used to shoot macro scenes. The embodiments of the present application do not make special limitations.

[0150] Optionally, the electronic device 100 may further include a lens protection lens 103 for protecting the lens module 40. The lens protection lens 103 is disposed on the housing 10 and is used to cover the lens module 40. When the lens protection lens 103 is used to protect the front lens module, the lens protection lens 103 may only cover the front lens module or cover the entire front surface of the electronic device 100. When the lens protection lens 103 covers the entire front surface of the electronic device 100, it can be used to protect both the front lens module and the display screen 20 at the same time. The lens protection lens 103 is the cover glass (CG). When the lens protection lens 103 is used to protect the rear lens module, the lens protection lens 103 may cover the entire back surface of the electronic device 100 or may only be disposed at the position corresponding to the rear lens module to protect the rear lens module. The material of the lens protection lens 103 may be glass, sapphire, ceramic, etc., and the embodiments of the present application do not make special limitations. In some embodiments, the lens protection lens 103 is transparent, so that the light beam outside the electronic device 100 can enter the lens module 40 through the lens protection lens 103.

[0151] It should be noted that the front surface of the electronic device 100 described in the embodiments of the present application can be understood as the surface of the side facing the user when the user uses the electronic device 100, and the back surface of the electronic device 100 can be understood as the surface of the side facing away from the user when the user uses the electronic device 100.

[0152] It should be understood that Figure 1 the electronic device 100 shown in

[0153] is not limited to including the above components, and may further include other components, such as a battery, a flash, a fingerprint recognition module, a receiver, a button, a sensor, etc. The embodiments of the present application only take the electronic device installed with the lens module 40 as an example for illustration, but the components installed on the electronic device 100 are not limited to this.

[0154] In some embodiments, the electronic device 100 may further include a memory (not shown in the figure). The memory is communicatively connected to the image processor 30. After the image processor 30 processes the image digital signal, the image is transmitted to the memory so that the image can be retrieved from the memory and displayed on the display screen 20 whenever needed for subsequent viewing. In some embodiments, the image processor 30 also compresses the processed image digital signal and then stores it in the memory to save memory space.

[0155] In some embodiments, the lens module 40 may include an optical lens and a photosensitive element. The photosensitive element is located on the image side of the optical lens. The lens module 40 may further include a circuit board (not shown in the figure), and the photosensitive element may be fixed to the circuit board. The filter may be located between the optical lens and the photosensitive element. The light beam can pass through the optical lens and irradiate the photosensitive surface of the photosensitive element. Exemplarily, the working principle of the lens module 40 is as follows: The light beam reflected by the photographed scene passes through the optical lens to generate an optical image projected onto the photosensitive surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to the analog-to-digital converter to be converted into a digital image signal for the image processor 30.

[0156] Among them, the photosensitive element (also known as an image sensor) is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface. When irradiated by light, it generates electric charges. The photosensitive element can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The charge-coupled device is made of a high-sensitivity semiconductor material and can convert a light beam into electric charges. The charge-coupled device consists of many photosensitive units, usually in units of millions of pixels. When the surface of the charge-coupled device is irradiated by a light beam, each photosensitive unit reflects the electric charges on the component, and the signals generated by all the photosensitive units are added together to form a complete picture. The complementary metal-oxide-semiconductor device mainly uses semiconductors made of silicon and germanium elements, so that there are semiconductors with N (negatively charged) and P (positively charged) levels coexisting on the complementary metal-oxide-semiconductor device. The current generated by these two complementary effects can be recorded and interpreted as an image by the processing chip.

[0157] Among them, the optical lens mainly uses the refraction principle of the lens to form an image, that is, the scene light beam passes through the optical lens to form a clear image on the focal plane, and the photosensitive element located on the focal plane records the image of the scene.

[0158] Figure 2 is a schematic structural diagram of another example of the lens module 40 provided by the embodiments of the present application, where Figure 2In (a), it shows the state when the lens module 40 captures a distant object. Figure 2 In (b), it shows the state when the lens module captures a nearby object.

[0159] The lens module 40 may include a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, the second lens group G2, and the second prism P2 may form an optical lens, and the image sensor 43 is located on the image side of the optical lens. Among them, the first lens group G1 includes at least one optical lens, and the first lens group G1 has a positive optical power for receiving light beams and converging the light beams. For example, the first lens group G1 may include a first lens L1, a second lens L2, and a third lens L3. The second lens group G2 includes at least one optical lens, and the second lens group G2 has a negative optical power. For example, the second lens group G2 may include a fourth lens L4 and a fifth lens L5.

[0160] The first lens group G1 is capable of focusing and imaging objects at different object distances. The first lens group G1 is a movable lens group. That is to say, the first lens group G1 can move at least one optical lens in the first lens group G1 under the drive of a driving element such as a motor. For example, the first lens group G1 may be wrapped by a mechanical moving member (such as a motor), and the mechanical moving member can change the relative position between the first lens group G1 and the first prism P1 for imaging objects at different object distances.

[0161] Exemplarily, as Figure 2 shown in (a) and Figure 2 shown in (b), during the focusing process of the lens module 40 switching from a distant view to a near view, the first lens L1, the second lens L2, and the third lens L3 can move along the optical axis towards the object side under the drive of a driving element such as a motor to achieve focusing.

[0162] The first prism P1 is located on the image side of the first lens group G1. The first prism P1 may include at least three characteristic surfaces. For example, the first prism P1 includes a first surface S1-1, a second surface S1-2, and a third surface S1-3. A light beam can enter the first prism P1 from the first surface S1-1 and exit the first prism P1 from the third surface S1-3. Among them, the first surface S1-1 is an incident surface (which can be called the first incident surface), and it is also a transmission and total internal reflection (TIR) surface. It transmits the light received from the first lens group G1 and reflects the light received from the second surface S1-2 of the prism to the third surface S1-3 through TIR; the second surface S1-2 is a reflection surface (which can be called the first reflection surface), and it is also a reflection surface coated with a mirror coating. It reflects the light received through the first surface S1-1 back to the first surface S1-1 in the prism; the third surface S1-3 is an exit surface (which can be called the first exit surface), and it is also a transmission surface that transmits the light received from the first surface S1-1. In short, the light beam enters the first prism P1 from the first surface S1-1, is reflected by the second surface S1-2 to the first surface S1-1 and undergoes total internal reflection at the first surface S1-1, and the reflected light finally exits the first prism P1 through the third surface S1-3.

[0163] It should be understood that the first included angle θ1 between the first surface S1-1 and the second surface S1-2 (i.e., the first incident surface S1-1 and the first reflection surface S1-2) is less than 45° (for example, θ1 is 25°). Exemplarily, the range of θ1 can be: 0° < θ1 < 10°, 10° ≤ θ1 < 20°, 20° ≤ θ1 < 25°, 25° ≤ θ1 < 30°, 30° ≤ θ1 < 35°, 35° ≤ θ1 < 40°, 40° ≤ θ1 < 45°. Exemplarily, the range of θ1 can be: 22° < θ1 < 28°.

[0164] It should be noted that the value of the first included angle θ1 is related to the refractive index of the first prism P1. In order to satisfy total internal reflection, the first included angle θ1 and the refractive index n1 of the first prism P1 can satisfy the following relationship: n1 ≥ 1 / sin(2*θ1). In a conventional folded lens system, the angle between the first surface of the first prism and the second surface of the first prism is usually 45°. In this application, by setting the angle between the first surface S1-1 and the second surface S1-2 of the first prism P1 to be less than 45°, that is, reducing the angle between the first surface S1-1 and the second surface S1-2 in the first prism P1, it helps to reduce the height of the lens module in the Z direction (i.e., the thickness direction of the electronic device), and thus helps to reduce the size of the lens module 40.

[0165] The second prism P2 is located on the image side of the first prism P1. The second prism P2 may include at least three characteristic surfaces. For example, the second prism P2 includes a fourth surface S2-1, a fifth surface S2-2, and a sixth surface S2-3. The fourth surface S2-1 is an incident surface (which can be called the second incident surface) and is also a transmission surface, which transmits the light received from the first prism P1 to the fifth surface S2-2 in the prism. The fifth surface S2-2 is an exit surface (which can be called the second exit surface) and is also a transmission and TIR surface, which reflects the light received through the fourth surface S2-1 to the sixth surface S2-3 in the prism by TIR, and transmits the light received from the sixth surface S2-3 in the prism to form an image in the image sensor 43. The sixth surface S2-3 is a reflective surface coated with a mirror coating (which can be called the second reflective surface), which reflects the light received from the fifth surface S2-2 back to the fifth surface S2-2. In short, the light beam enters the second prism P2 through the fourth surface S2-1, is then totally reflected by the fifth surface S2-2, then reflected by the sixth surface S2-3 to the fifth surface S2-2, and finally exits the second prism P2 through the fifth surface S2-2.

[0166] It should be understood that the second included angle θ2 between the fifth surface S2-2 and the sixth surface S2-3 (i.e., the second exit surface S2-2 and the second reflective surface S2-3) is less than 45°. For example, θ2 is 25°, and the second included angle θ2 is equal in size to the first included angle θ1. Exemplarily, the range of θ2 can be: 0° < θ2 < 10°, 10° ≤ θ2 < 20°, 20° ≤ θ2 < 25°, 25° ≤ θ2 < 30°, 30° ≤ θ2 < 35°, 35° ≤ θ2 < 40°, 40° ≤ θ2 < 45°. Exemplarily, the range of θ2 can be: 22° < θ3 < 28°.

[0167] It should be noted that the value of the second included angle θ2 is related to the refractive index of the second prism P2. In order to satisfy total reflection, the second included angle θ2 and the refractive index n2 of the second prism P2 satisfy the following relationship: n2 ≥ 1 / sin(2*θ2). By setting the angle between the fifth surface S2-2 and the sixth surface S2-3 of the second prism P2 to be less than 45°, that is, reducing the angle between the fifth surface S2-2 and the sixth surface S2-3 in the second prism P2, it helps to reduce the height of the lens module in the Z direction (i.e., the thickness direction of the electronic device), and thus helps to reduce the size of the lens module 40.

[0168] It should be noted that the greater the refractive index of the prism materials of the first prism P1 and the second prism P2, the better, and the lower the dispersion coefficient, the better. The higher the refractive index of the prism, the easier it is to have total reflection. Among them, the refractive index of the first prism P1 and the refractive index of the second prism P2 are both greater than 1.5, and the Abbe number is greater than 40.

[0169] It should be understood that by disposing the second lens group G2 between the first prism P1 and the second prism P2, the lens module 40 can have good macro performance, achieving an optical magnification of 0.1 times or more and a macro focusing distance of less than 20 cm.

[0170] It should be understood that the optical axis of the third surface S1-3 of the first prism P1 coincides with the optical axis of the second lens group G2, and the optical axis of the fourth surface S2-1 of the second prism P2 coincides with the optical axis of the second lens group G2. That is to say, the coaxial system is adopted in this application. By using the coaxial system for the optical lens, compared with the off-axis system, off-axis aberrations will not be generated. The prisms and lenses in the coaxial system can all adopt a centrosymmetric structure, which is convenient for production and manufacturing and has strong feasibility. In addition, compared with the off-axis system, it is easier to find the center point of the prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0171] In some embodiments, as Figure 2 shown, the first surface S1-1, the second surface S1-2, and the third plane S1-3 of the first prism P1 can all be planes, and the fourth surface S2-1, the fifth surface S2-2, and the sixth surface S2-3 of the second prism P2 are all planes.

[0172] In some other embodiments, the first surface S1-1 of the first prism P1 is a plane, and the second surface S1-2 and / or the third plane S1-3 of the first prism P1 can be surfaces with optical power; the fifth surface S2-2 of the second prism P2 is a plane, and the fourth surface S2-1 and / or the sixth surface S2-3 can be surfaces with optical power. This application does not limit this.

[0173] Exemplarily, in order to make the first prism P1 form a surface with optical power, the lens in the second lens group G2 can be fixedly connected to the first exit surface (i.e., the third plane S1-3) of the first prism P1 through a gluing process.

[0174] Exemplarily, in order to make the second prism P2 form a surface with optical power, the lens in the second lens group G2 can be fixedly connected to the second incident surface (i.e., the fourth surface S2-1) of the second prism P2 through a gluing process.

[0175] In Figure 2In the lens module 40 shown, the image sensor 43 is located on the image side of the optical lens and is disposed parallel to the fifth surface S2-2 (i.e., the second exit surface), such that the first prism P1 and the second prism P2 can fold the optical axis four times. The second surface S1-2 of the first prism P1 folds the optical axis once; then, the first surface S1-1 of the first prism P1 folds the optical axis a second time; then, the fifth surface S2-2 of the second prism P2 folds the optical axis again; then, the sixth surface S2-3 of the second prism P2 folds the optical axis for the fourth time; and the light beam finally enters the image sensor 43. By setting a longer and more complex optical path in this application, aberration can be better corrected.

[0176] In some other embodiments, by obliquely disposing the image sensor 43, that is, the image sensor 43 is located on the image side of the optical lens and is disposed parallel to the sixth surface S2-3 (i.e., the second reflection surface), such that the first prism P1 and the second prism P2 fold the optical axis three times. The second surface S1-2 of the first prism P1 folds the optical axis once; then, the first surface S1-1 of the first prism P1 folds the optical axis again; then, the fifth surface S2-2 of the second prism P2 folds the optical axis for the third time; and the light beam finally enters the image sensor 43.

[0177] It should be understood that the entire optical lens has a positive optical power, that is, the absolute value of the optical power of the first lens group G1 is greater than the absolute value of the optical power of the second lens group G2.

[0178] In one example, L1 may have a positive optical power, and at least one of L2 and L3 has a negative optical power. It should be understood that with this setting method, it is beneficial for the optical lens to correct aberration, thereby having better imaging quality. It should be understood that from the perspective of engineering implementation, a design where L1 has a positive optical power, L2 has a positive optical power, and L3 has a negative optical power can be adopted.

[0179] Exemplarily, L4 has a positive optical power and L5 has a negative optical power, or L4 has a negative optical power and L5 has a positive optical power, and L4 and L5 as a whole (i.e., the second lens group G2) have a negative optical power. In this example, by setting the optical powers of the two lenses in the second lens group to be one positive and one negative, it is beneficial for aberration correction, such that the optical lens has better imaging quality.

[0180] Optionally, the optical lens may further include a third lens group. The third lens group may include at least one optical lens. The third lens group is located on the image side of the second prism P2, specifically between the second prism P2 and the image sensor 43. The third lens group can be used to correct aberration and improve imaging quality.

[0181] It should be understood that the entire optical lens has a positive optical power, that is, it converges the light beam. That is to say, when there is a third lens group, the overall formed by the first lens group, the second lens group, and the third lens group has a positive optical power. Among them, the third lens group can have a positive optical power or a negative optical power, and the present application does not limit this.

[0182] It should be noted that, in order to better correct aberrations, the more lenses provided in the optical lens, the better. However, limited by the total height of the optical lens system and the size of the electronic device, the number of lenses included in the optical lens in the embodiments of the present application can be 3 to 5. For example, the first lens group G1 can include 1 lens, and the second lens group G2 can include 4 lenses. Another example is that the first lens group G1 can include 2 lenses, and the second lens group G2 can include 3 lenses. This example will be combined with Figure 5 for detailed introduction. Another example is that the first lens group G1 can include 1 lens, the second lens group G2 can include 1 lens, and the third lens group G3 can include 1 lens. This example will be combined with Figure 8 for detailed introduction.

[0183] Optionally, the optical lens may further include an infrared filter 42. The infrared filter 42 is located on the image side of the second prism P2, specifically between the second prism P2 and the image sensor 43. More specifically, the infrared filter 42 is located between the fifth surface S2-2 of the second prism P2 and the image sensor 43. The infrared filter 42 can be used to filter out unnecessary optical signals. In some other embodiments, the optical lens may not be provided with an infrared filter separately. For example, an infrared cut-off film layer is provided on the light-emitting surface of the fifth surface S2-2 of the second prism P2 to filter out unnecessary optical signals. Or, an absorbent substance is added to the light-emitting surface of the fifth surface S2-2 of the second prism P2 to filter out unnecessary optical signals.

[0184] Optionally, the optical lens may further include an aperture stop STO. As Figure 2 shown, the aperture stop STO can be disposed between the first lens group G1 and the first prism P1. Specifically, the aperture stop STO can be disposed between the fourth lens L4 and the first surface S1-1 of the first prism P1. In some other embodiments, the aperture stop STO can also be located on the object side of the first lens group G1, which can reduce the total height of the optical lens system. In some other embodiments, the aperture stop STO can also be located between the first prism P1 and the second lens group G2, or between the second lens group G2 and the second prism P2. It should be understood that the aperture stop STO can be used to adjust the aperture, filter out stray light, and improve the imaging quality of the lens module 40.

[0185] Among them, the aperture stop STO can be a spacer structure or a variable vane structure; or, the aperture stop STO can be realized by a surface spraying process, for example, by spraying a light-shielding material on the lens to form the aperture stop STO. Among them, the position of the aperture stop STO can be fixed or variable. For example, if the position of the aperture stop STO is variable, the aperture stop STO can adjust its position according to the focusing situation to be located between different lenses.

[0186] The following presents a possible design of the lens module 40 as shown in Figure 2 in combination with parameter data and simulation results.

[0187] Exemplarily, as shown in Figure 2 the lens module 40 includes a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, an infrared filter 42, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3, and the second lens group includes a fourth lens L4 and a fifth lens L5. The refractive index n1 of the first prism P1 is 1.70, and the first angle θ1 between its first surface S1-1 and second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.69, and the angle θ2 between its fifth surface S2-2 and sixth surface S2-3 is 25°.

[0188] The first lens group G1 can be wrapped by a mechanical moving part (such as a motor), and by changing the relative position between the first lens group G1 and the first prism P1, objects at different object distances can be imaged, and its closest focusing distance is 20 cm. The following introduces the relevant parameters of the lens module 40 as shown in Figure 2 in combination with Table 1A and Table 1B.

[0189] Table 1A Basic Parameters of the Lens Module

[0190]

[0191] It should be noted that when the image sensor 43 is vertically arranged, the "total system height" in Table 1A is the vertical distance between the first surface of the first lens (i.e., L1) and the image sensor 43, the "shoulder height of the system" is the vertical distance between the first surface S1-1 of the first prism P1 and the image sensor 43, and the "system length" is the longest distance of the lens module 40 along the length direction of the electronic device, that is, the vertical distance between the top end of the first lens L1 and the bottom end of the image sensor 43.

[0192] As can be seen from Table 1A, by adopting the structure as shown in Figure 2The shown lens module 40 has a total system height of 8.09 mm, a system shoulder height of 3.89 mm, and a system length of 13.4 mm, which are all reduced to a certain extent compared with the 45° prism solution, thus enabling the reduction of the volume of the lens module. In addition, by using such as Figure 2 The shown lens module 40 can achieve a minimum focusing object distance of 200 mm and has a good macro effect.

[0193] Table 1B Parameter Table of Moving Parts of the Lens Module at Different Object Distances

[0194]

[0195] As can be seen from Table 1B, at an infinite object distance, the distance between the second surface S1-2 of the third lens L3 of the first lens group G1 and the first surface S1-1 of the first prism P1 is 0.569 mm, and the second surface S1-2 is the side of the third lens L3 close to the first prism P1. When the lens module 40 is adjusted from an infinite object distance to a 200 mm object distance, the first lens group G1 moves to the side away from the first prism P1 (i.e., moves towards the object side). At a 200 mm object distance, the distance between the second surface S1-2 of the third lens L3 and the first surface S1-1 of the first prism P1 is 1.253 mm.

[0196] Figure 3 and Figure 4 show Figure 2 the modulation transfer function (MTF) of the lens module 40 at an infinite object distance and at a 200 mm object distance. Among them, Figure 3 is the defocus MTF curve of this embodiment at an infinite object distance with a spatial frequency of 125 lp / mm. As can be seen from Figure 3 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction at different fields of view at an infinite object distance is greater than 0.4. This result indicates that Figure 2 the lens module 40 can achieve high-quality imaging at an infinite object distance. Figure 4 is the defocus MTF curve of this embodiment at a 200 mm object distance with a spatial frequency of 89 lp / mm. As can be seen from Figure 4 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction at different fields of view at a 200 mm macro distance is greater than 0.5. This result indicates that Figure 2 the lens module 40 can achieve high-quality macro imaging.

[0197] Figure 5 is a schematic structural diagram of another example of the lens module 40 provided by the embodiment of the present application. Among them, Figure 5 in (a) is the state when the lens module 40 shoots a distant object, Figure 5In (b), it shows the state when the lens module captures a nearby object.

[0198] It should be noted that Figure 5 the shown lens module is similar in structure to Figure 2 the shown lens module. The main difference between the two lies in the number of lenses included in the first lens group G1 and the number of lenses included in the second lens group G2. Therefore, other relevant descriptions of the first lens group G1, the second lens group G2, the first prism P1, and the second prism P2 can refer to Figure 2 the relevant elaboration in it, and will not be repeated here. The following mainly introduces the differences.

[0199] As Figure 5 shown, the lens module 40 may include a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, an infrared filter 42, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, the second lens group G2, and the second prism P2 can form an optical lens, and the image sensor 43 is located on the image side of the optical lens. Among them, the first lens group G1 includes at least one optical lens, and the first lens group G1 has a positive optical power for receiving light beams and converging the light beams. For example, the first lens group G1 may include a first lens L1 and a second lens L2. The second lens group G2 includes at least one optical lens, and the second lens group G2 has a negative optical power. For example, the second lens group G2 may include a third lens L3, a fourth lens L4, and a fifth lens L5.

[0200] In one example, L1 may have a positive optical power, L2 may have a negative optical power, and the whole of L1 and L2 (i.e., the first lens group G1) has a positive optical power. In this example, by setting L1 to have a positive optical power and L2 to have a negative optical power, it is beneficial to control the aberration of the light beam passing through the first lens group G1, making it easier for the first lens group G1 to perform aberration correction, and the optical lens has better imaging quality. In other examples, L1 may have a positive optical power, and L2 may also have a positive optical power. This application does not make any limitations in this regard.

[0201] It should be understood that at least one of the three lenses in the second lens group G2 has a positive optical power and at least one has a negative optical power. The specific optical powers of L3, L4, and L5 are not limited. For example, L3 may have a positive optical power, L4 may have a negative optical power, L5 may have a negative optical power (or have a positive optical power), and the whole formed by L3, L4, and L5 (i.e., the second lens group G2) has a negative optical power.

[0202] In Figure 5 the shown lens module, compared with the scheme where the first lens group G1 includes three lenses (such as Figure 2The shown lens module), two lenses are arranged in the first lens group G1. On the one hand, it can well correct aberration, and on the other hand, it can also reduce the size of the optical lens.

[0203] The following combines parameter data and simulation results to present a possible design method of the lens module 40 as Figure 5 shown.

[0204] Exemplarily, as Figure 5 shown, the lens module 40 includes a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, an infrared filter 42, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1 and a second lens L2, and the second lens group includes a third lens L3, a fourth lens L4, and a fifth lens L5. The refractive index n1 of the first prism P1 is 1.74, and the first included angle θ1 between its first surface S1-1 and the second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.70, and the included angle θ2 between its fifth surface S2-2 and the sixth surface S2-3 is 25°.

[0205] The first lens group G1 can be wrapped by a mechanical moving part (such as a motor). By changing the relative position between the first lens group G1 and the first prism P1, it is used to image objects at different object distances, and its closest focusing distance is 6 cm. The following combines Table 2A and Table 2B to introduce the relevant parameters of the lens module 40 as Figure 5 shown.

[0206] Table 2A Basic parameters of the lens module

[0207]

[0208]

[0209] It can be seen from Table 2A that by using the lens module 40 as Figure 5 shown, the total height of its system is 8.22 mm, the shoulder height of the system is 4.3 mm, and the length of the system is 13.0 mm, which are all reduced to a certain extent compared with the 45° prism scheme, so as to be able to reduce the volume of the lens module. In addition, by using the lens module 40 as Figure 2 shown, its closest focusing object distance can reach 60 mm, having a good macro effect.

[0210] Table 2B Parameter table of moving parts of the lens module at different object distances

[0211]

[0212] As can be seen from Table 2B, at an infinite object distance, the distance between the second surface S1-2 of the second lens L2 of the first lens group G1 and the first surface S1-1 of the first prism P1 is 0.403 mm. The second surface S1-2 is the side of the second lens L2 close to the first prism P1. When the lens module 40 is adjusted from an infinite object distance to a 200 mm object distance, the first lens group G1 moves to the side away from the first prism P1 (i.e., moves towards the object side). At a 60 mm object distance, the distance between the second surface S1-2 of the second lens L2 and the first surface S1-1 of the first prism P1 is 0.896 mm.

[0213] Figure 6 and Figure 7 shows Figure 5 the modulation transfer function MTF of the lens module 40 at an infinite object distance and at a 60 mm object distance. Among them, Figure 6 is the defocus MTF curve of this embodiment at an infinite object distance when the spatial frequency is 125 lp / mm. As can be seen from Figure 6 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction at different fields of view at an infinite object distance is greater than 0.45. This result shows that Figure 5 the lens module 40 can achieve high-quality imaging at an infinite object distance. Figure 7 is the defocus MTF curve of this embodiment at a 60 mm object distance when the spatial frequency is 89 lp / mm. As can be seen from Figure 7 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction at different fields of view at a 60 mm macro distance is greater than 0.5. This result shows that Figure 5 the lens module 40 can achieve high-quality macro imaging.

[0214] Figure 8 is a schematic structural diagram of another example of the lens module 40 provided by the embodiment of the present application. Among them, Figure 8 in (a) is the state when the lens module 40 shoots a distant object, Figure 8 in (b) is the state when the lens module shoots a near object.

[0215] It should be noted that, Figure 8 the lens module shown is similar in structure to Figure 2 the lens module shown. The main difference between the two is the number of lenses included in the first lens group G1 and the number of lenses included in the second lens group G2. Therefore, other relevant descriptions of the first lens group G1, the second lens group G2, the first prism P1, and the second prism P2 can refer to the relevant elaboration in Figure 2 , and will not be repeated here. The following mainly introduces the differences.

[0216] As Figure 8As shown, the lens module 40 may include a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, a third lens group G3, an infrared filter 42, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, the second lens group G2, the second prism P2, and the third lens group G3 may form an optical lens, and the image sensor 43 is located on the image side of the optical lens.

[0217] Among them, the first lens group G1 may include a first lens L1, the second lens group G2 may include a second lens L2, and the third lens group G3 may include a third lens L3. Moreover, the first lens L1 has a positive optical power for receiving light rays and converging the light rays; the second lens L2 has a negative optical power; the third lens L3 may have a positive or negative optical power, and the third lens L3 can be used to correct aberrations and improve imaging quality.

[0218] It should be understood that the entire optical lens has a positive optical power, that is, it has a converging effect on the light beam. That is to say, the overall formed by the first lens group G1, the second lens group G2, and the third lens group G3 has a positive optical power.

[0219] In Figure 8 In the shown lens module 40, the aperture stop STO may be disposed on the object side of the first lens group G1. In other embodiments, the aperture stop STO may be disposed between the first lens group G1 and the first prism P1, or the aperture stop STO may be disposed between the first prism P1 and the second lens group G2, or the aperture stop STO may be disposed between the second lens group G2 and the second prism P2, or the aperture stop STO may be disposed between the second prism P2 and the third lens group G3. The present application does not make any limitation thereto.

[0220] The following presents a possible design of the lens module 40 as shown Figure 8 in combination with parameter data and simulation results.

[0221] Exemplarily, as Figure 8 shown, the lens module 40 includes a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, a third lens group G3, an infrared filter 42, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1, the second lens group G2 includes a second lens L2, and the third lens group G3 includes a third lens L3. The refractive index n1 of the first prism P1 is 1.67, and the first angle θ1 between its first surface S1-1 and second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.67, and the angle θ2 between its fifth surface S2-2 and sixth surface S2-3 is 25°.

[0222] The first lens group G1 can be enclosed by a mechanical moving part (such as a motor). By changing the relative position between the first lens group G1 and the first prism P1, it is used to image objects at different object distances, and its closest focusing distance is 20 cm. The following will introduce the relevant parameters of the lens module 40 as shown in Figure 8 below in combination with Table 3A and Table 3B.

[0223] Table 3A Basic Parameters of the Lens Module

[0224]

[0225] As can be seen from Table 3A, for the lens module 40 as shown in Figure 8 below, the total height of the system is 9.39 mm, the shoulder height of the system is 6.3 mm, and the length of the system is 14.1 mm. Compared with the 45° prism solution, they are all reduced to a certain extent, so that the volume of the lens module can be reduced. In addition, for the lens module 40 as shown in Figure 8 below, its closest focusing object distance can reach 200 mm, and it has a good macro effect.

[0226] Table 3B Parameter Table of Moving Parts of the Lens Module at Different Object Distances

[0227]

[0228] As can be seen from Table 4B, at an infinite object distance, the distance between the second surface S1-2 of the first lens L1 of the first lens group G1 and the first surface S1-1 of the first prism P1 is 0.35 mm, and this second surface S1-2 is the side of the first lens L1 close to the first prism P1. When the lens module 40 is adjusted from an infinite object distance to a 200 mm object distance, the first lens L1 moves away from the first prism P1 (i.e., moves towards the object side), and at a 200 mm object distance, the distance between the second surface S1-2 of the first lens L1 and the first surface S1-1 of the first prism P1 is 0.895 mm.

[0229] Figure 9 and Figure 10 show the modulation transfer function MTF of the lens module 40 as shown in Figure 8 below at an infinite object distance and at a 200 mm object distance. Among them, Figure 9 is the defocus MTF curve of this embodiment at an infinite object distance with a spatial frequency of 125 lp / mm. As can be seen from Figure 9 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction at different fields of view at an infinite object distance is greater than 0.6. This result shows that Figure 8 the lens module 40 as shown in Figure 10 below can achieve high-quality imaging at an infinite object distance. is the defocus MTF curve of this embodiment at a 200 mm object distance with a spatial frequency of 89 lp / mm.Figure 10 It can be seen that the modulation transfer function (MTF) at different fields of view under 200 mm macro is greater than 0.6 in both the sagittal and meridional directions. This result indicates that Figure 8 the lens module 40 can achieve high-quality macro imaging.

[0230] Figure 11 is a schematic structural diagram of another example of the lens module 40 provided by an embodiment of the present application. Among them, Figure 11 (a) in is the state when the lens module 40 captures a distant object, Figure 11 (b) in is the state when the lens module captures a near object.

[0231] It should be noted that Figure 11 the lens module shown is similar in structure to the lens module shown in Figure 2 Therefore, other related descriptions of the first lens group G1, the second lens group G2, the first prism P1, and the second prism P2 can refer to the relevant elaborations in Figure 2 and will not be repeated here. The following mainly introduces the differences.

[0232] The lens module 40 may include a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, the second lens group G2, and the second prism P2 can form an optical lens, and the image sensor 43 is located on the image side of the optical lens.

[0233] Exemplarily, the first lens group G1 may include at least one variable lens. During the focusing process of the optical lens switching from a distant view to a near view, the optical power of the variable lens in the first lens group G1 increases.

[0234] Exemplarily, the second lens group G2 may also include at least one variable lens, and the variable lens in the second lens group G2 is used to correct the additional aberration brought by the variable lens in the first lens group G1.

[0235] In some embodiments, as shown in Figure 11 , the first lens group G1 may include a first variable lens LF1, a second lens L2, and a third lens L3, and the second lens group G2 may include a fourth variable lens LF4, a fifth lens L5, and a sixth lens L6. It should be understood that a variable lens refers to a lens whose lens surface shape can be changed by means of electric, acoustic, magnetic, or other driving methods.

[0236] The first variable lens LF1 in the first lens group G1 and the fourth variable lens LF4 in the second lens group G2 can change the surface shape and thickness under the drive of electricity, sound, magnetism, etc., and are used to image objects at different object distances.

[0237] It should be noted thatFigure 11 In the structure shown, the lens module 40 achieves focusing by varying the optical power, radius of curvature, refractive index, etc. of the variable lens. In other embodiments, the lens module 40 may achieve focusing by moving the first lens group G1.

[0238] The following presents a possible design of the lens module 40 as shown in Figure 11 combination with parameter data and simulation results.

[0239] Exemplarily, as shown in Figure 11 the figure, the lens module 40 includes a first lens group G1, a first prism P1, a second lens group G2, a second prism P2, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 may include a first variable lens LF1, a second lens L2, and a third lens L3, and the second lens group G2 may include a fourth variable lens LF4, a fifth lens L5, and a sixth lens L6. The refractive index n1 of the first prism P1 is 1.75, and the first included angle θ1 between its first surface S1-1 and second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.73, and the included angle θ2 between its fifth surface S2-2 and sixth surface S2-3 is 25°.

[0240] The first variable lens LF1 in the first lens group G1 and the fourth variable lens LF4 in the second lens group G2 can change the surface shape and thickness under the drive of electricity, sound, magnetism, etc., and are used to image objects at different object distances, and its closest focusing distance is 20 cm. The following introduces the relevant parameters of the lens module 40 as shown in Figure 11 the figure in combination with Table 4A.

[0241] Table 4A Basic Parameters of the Lens Module

[0242]

[0243] As can be seen from Table 4A, for the lens module 40 as shown in Figure 11 the figure, the total height of the system is 10.59 mm, the shoulder height of the system is 6.69 mm, and the length of the system is 25.05 mm, which are all reduced to a certain extent compared with the 45° prism solution, so as to reduce the volume of the lens module. In addition, for the lens module 40 as shown in Figure 11 the figure, its closest focusing object distance can reach 200 mm, having a good macro effect.

[0244] In the embodiments of the present application, all even aspherical surface shapes z can be defined by, but not limited to, the following aspherical curve equations:

[0245]

[0246] Wherein, z is the relative distance of a point on the aspherical surface at a distance r from the optical axis to the tangent plane at the intersection of the aspherical surface and the optical axis; r is the perpendicular distance of a point on the aspherical curve from the optical axis; c is the curvature; k is the conic coefficient; is the i-th order aspherical coefficient. Tables 4B and 4C show the conic constant k and the aspherical coefficients corresponding to the surfaces of the variable lens in Table 1, where A4, A6, A8, ……, A 30 respectively represent the 4th order, 6th order, 8th order, ……, 30th order aspherical coefficients.

[0247] Table 4B Parameter Table of Moving Parts of the Lens Module at Different Object Distances

[0248]

[0249] It can be seen from Table 4B that when the lens module 40 is adjusted from an infinite object distance to a 200 mm object distance, the first lens group G1 and the second lens group G2 do not move. Instead, the radius of curvature of the first variable lens LF1 in the first lens group G1 and the fourth variable lens LF4 in the second lens group G2 can change, and the optical power changes, thereby achieving focusing.

[0250] Table 4C Aspherical Coefficients of Variable Lenses

[0251]

[0252] Figure 12 and Figure 13 show Figure 11 the modulation transfer function MTF of the lens module 40 at an infinite object distance and a 200 mm object distance. Among them, Figure 12 is the defocus MTF curve of this embodiment at an infinite object distance with a spatial frequency of 125 lp / mm. As can be seen from Figure 12 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction is greater than 0.4 at different fields of view at an infinite object distance. This result shows that Figure 11 the lens module 40 can achieve high-quality imaging at an infinite object distance. Figure 13 is the defocus MTF curve of this embodiment at a 200 mm object distance with a spatial frequency of 89 lp / mm. As can be seen from Figure 13 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction is greater than 0.5 at different fields of view at a 200 mm macro distance. This result shows that Figure 11 the lens module 40 can achieve high-quality macro imaging.

[0253] Figure 14 is a schematic structural diagram of a lens module 40 provided in an embodiment of the present application. Among them, Figure 14 in (a) is the state of the lens module 40 when shooting a distant object, Figure 14In (b), it shows the state when the lens module captures a nearby object.

[0254] The lens module 40 may include a first lens group G1, a first prism P1, a second prism P2, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, and the second prism P2 may form an optical lens, and the image sensor 43 is located on the image side of the optical lens.

[0255] Among them, the first lens group G1 includes at least one optical lens, and the first lens group G1 has a positive optical power for receiving light beams and converging the light beams. It should be understood that the first lens group G1 can focus on objects at different object distances and form images. The first lens group G1 is a movable lens group. That is to say, the first lens group G1 can make at least one optical lens in the first lens group G1 move under the drive of a driving element such as a motor. For example, the first lens group G1 may be wrapped by a mechanical moving member (such as a motor), and the mechanical moving member can change the relative position between the first lens group G1 and the first prism P1 for imaging objects at different object distances.

[0256] Exemplarily, as Figure 14 in (a) and Figure 14 in (b) show, during the focusing process of the lens module 40 switching from a long shot to a close shot, the first lens group G1 can move along the optical axis towards the object side, that is, the first lens group G1 can move along the optical axis in a direction away from the first prism P1.

[0257] In some embodiments, as Figure 14 shown, the first lens group G1 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. During the focusing process of the lens module 40 switching from a long shot to a close shot, the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can move along the optical axis towards the object side under the drive of a driving element such as a motor to achieve focusing.

[0258] In some other embodiments, the first lens group G1 includes at least one variable lens. During the focusing process of the optical lens switching from a long shot to a close shot, the optical power of the variable lens in the first lens group G1 increases. It should be understood that a variable lens refers to a lens whose lens surface shape can be changed by driving methods such as electricity, sound, or magnetism.

[0259] The first prism P1 is located on the image side of the first lens group G1. The first prism P1 may include at least three characteristic surfaces. For example, the first prism P1 includes a first surface S1-1, a second surface S1-2, and a third surface S1-3. A light beam can enter the first prism P1 from the first surface S1-1 and exit the first prism P1 from the third surface S1-3. Among them, the first surface S1-1 is an incident surface (which can be called the first incident surface), and it is also a transmission and total internal reflection (TIR) surface. It transmits the light received from the first lens group G1 and reflects the light received from the second surface S1-2 of the prism to the third surface S1-3 through TIR; the second surface S1-2 is a reflective surface (which can be called the first reflective surface), and it is also a reflective surface coated with a mirror coating. It reflects the light received through the first surface S1-1 back to the first surface S1-1 in the prism; the third surface S1-3 is an exit surface (which can be called the first exit surface), and it is also a transmission surface that transmits the light received from the first surface S1-1. In short, the light beam enters the first prism P1 from the first surface S1-1, is reflected by the second surface S1-2 to the first surface S1-1 and undergoes total internal reflection at the first surface S1-1, and the reflected light finally exits the first prism P1 through the third surface S1-3.

[0260] It should be understood that the first included angle θ1 between the first surface S1-1 and the second surface S1-2 (i.e., the first incident surface S1-1 and the first reflective surface S1-2) is less than 45° (for example, θ1 is 25°). Exemplarily, the range of θ1 can be: 0° < θ1 < 10°, 10° ≤ θ1 < 20°, 20° ≤ θ1 < 25°, 25° ≤ θ1 < 30°, 30° ≤ θ1 < 35°, 35° ≤ θ1 < 40°, 40° ≤ θ1 < 45°. Exemplarily, the range of θ1 can be: 22° < θ1 < 28°.

[0261] It should be noted that the value of the first included angle θ1 is related to the refractive index of the first prism P1. In order to satisfy total internal reflection, the first included angle θ1 and the refractive index n1 of the first prism P1 can satisfy the following relationship: n1 ≥ 1 / sin(2*θ1). In a conventional folded lens system, the angle between the first surface and the second surface of the first prism is usually 45°. In this application, by setting the angle between the first surface S1-1 and the second surface S1-2 of the first prism P1 to be less than 45°, that is, reducing the angle between the first surface S1-1 and the second surface S1-2 in the first prism P1, it helps to reduce the height of the lens module in the Z direction (i.e., the thickness direction of the electronic device), thereby helping to reduce the size of the lens module 40.

[0262] The second prism P2 is located on the image side of the first prism P1. The second prism P2 may include at least three characteristic surfaces. For example, the second prism P2 includes a fourth surface S2-1, a fifth surface S2-2, and a sixth surface S2-3. The fourth surface S2-1 is an incident surface (which can be called the second incident surface) and also a transmission surface, which transmits the light received from the first prism P1 to the fifth surface S2-2 in the prism. The fifth surface S2-2 is an exit surface (which can be called the second exit surface) and also a transmission and TIR surface, which reflects the light received through the fourth surface S2-1 to the sixth surface S2-3 in the prism by TIR, and transmits the light received from the sixth surface S2-3 in the prism to form an image in the image sensor 43. The sixth surface S2-3 is a reflective surface coated with a mirror coating (which can be called the second reflective surface), which reflects the light received from the fifth surface S2-2 back to the fifth surface S2-2. In short, the light beam enters the second prism P2 through the fourth surface S2-1, is then totally reflected by the fifth surface S2-2, then reflected by the sixth surface S2-3 to the fifth surface S2-2, and finally exits the second prism P2 through the fifth surface S2-2.

[0263] It should be understood that the second included angle θ2 between the fifth surface S2-2 and the sixth surface S2-3 (i.e., the second exit surface S2-2 and the second reflective surface S2-3) is less than 45°. For example, θ2 is 25°, and the second included angle θ2 is equal in size to the first included angle θ1. Exemplarily, the range of θ2 can be: 0° < θ2 < 10°, 10° ≤ θ2 < 20°, 20° ≤ θ2 < 25°, 25° ≤ θ2 < 30°, 30° ≤ θ2 < 35°, 35° ≤ θ2 < 40°, 40° ≤ θ2 < 45°. Exemplarily, the range of θ2 can be: 22° < θ3 < 28°.

[0264] It should be noted that the value of the second included angle θ2 is related to the refractive index of the second prism P2. In order to satisfy total reflection, the second included angle θ2 and the refractive index n2 of the second prism P2 can satisfy the following relationship: n2 ≥ 1 / sin(2*θ2). By setting the angle between the fifth surface S2-2 and the sixth surface S2-3 of the second prism P2 to be less than 45° in this application, it helps to reduce the height in the Z direction (i.e., the thickness direction of the electronic device) of the lens module, thereby helping to reduce the size of the lens module 40.

[0265] In Figure 14In the lens module 40 shown, by providing the first prism P1 and the second prism P2, the optical axis can be folded four times. The second surface S1-2 of the first prism P1 folds the optical axis once; then, the first surface S1-1 of the first prism P1 folds the optical axis a second time; then, the fifth surface S2-2 of the second prism P2 folds the optical axis again; then, the sixth surface S2-3 of the second prism P2 folds the optical axis for the fourth time. By providing a longer and more complex optical path in the present application, aberration can be better corrected.

[0266] It should be understood that the optical axis of the fourth surface S2-1 of the second prism P2 coincides with the optical axis of the third surface S1-3 of the first prism P1. That is to say, a coaxial system is adopted in the present application. By using a coaxial system in an optical lens, compared with an off-axis system, off-axis aberration will not be generated. Prisms and lenses in the coaxial system can all adopt a centrosymmetric structure, which is convenient for production and manufacturing and has strong feasibility. In addition, compared with an off-axis system, it is easier to find the center point of prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0267] In some embodiments, as Figure 14 shown, both the first surface S1-1 and the second surface S1-2 of the first prism P1 are flat surfaces, and the third surface S1-3 is a surface with optical power; both the fifth surface S2-2 and the sixth surface S2-3 of the second prism P2 are flat surfaces, and the fourth surface S2-1 is a surface with optical power. In other embodiments, the first surface S1-1 of the first prism P1 is a flat surface, and the second surface S1-2 and the third surface S1-3 of the first prism P1 can also be surfaces with optical power; the fifth surface S2-2 of the second prism P2 is a flat surface, and both the fourth surface S2-1 and the sixth surface S2-3 are surfaces with optical power.

[0268] Exemplarily, in order to make the first prism P1 form a surface with optical power, a lens can be fixedly connected to the first exit surface (i.e., the third flat surface S1-3) of the first prism P1 through a gluing process to form a surface with optical power.

[0269] Exemplarily, in order to make the second prism P2 form a surface with optical power, a lens can be fixedly connected to the second incident surface (i.e., the fourth surface S2-1) of the second prism P2 through a gluing process to form a surface with optical power.

[0270] In other embodiments, the first prism P1 and / or the second prism P2 can be a special-shaped prism formed by integral processing. That is to say, when manufacturing the first prism P1 and the second prism P2, one surface of the first prism P1 (i.e., the third surface S1-3) can be set as a surface with optical power, and one surface of the second prism P2 (i.e., the fourth surface S2-1) can be set as a surface with optical power.

[0271] It should be noted that the optical power of the third surface S1-3 of the first prism P1 is opposite to that of the fourth surface S2-1 of the second prism P2, and the absolute value of the optical power of the third surface S1-3 of the first prism P1 is different from the absolute value of the optical power of the fourth surface S2-1 of the second prism P2. The overall combination of the first prism P1 and the second prism P2 has a negative optical power. It can be understood that the first prism P1 and the second prism P2 cannot be joined together to form a parallelogram prism.

[0272] For example, the third surface S1-3 of the first prism P1 has a positive optical power, the fourth surface S2-1 of the second prism P2 has a negative optical power, and the absolute value of the optical power of the third surface S1-3 of the first prism P1 is different from the absolute value of the optical power of the fourth surface S2-1 of the second prism P2. Another example is that the third surface S1-3 of the first prism P1 has a negative optical power, the fourth surface S2-1 of the second prism P2 has a positive optical power, and the absolute value of the optical power of the third surface S1-3 of the first prism P1 is different from the absolute value of the optical power of the fourth surface S2-1 of the second prism P2. It should be understood that by setting the third surface S1-3 of the first prism P1 and the fourth surface S2-1 of the second prism P2 as surfaces with optical power, the lens module 40 has good macro performance, and can achieve an optical magnification of 0.1 times or more and a macro focusing distance of less than 20 cm.

[0273] In Figure 14 In the shown lens module 40, the first lens group G1 has a positive optical power, the first prism P1 has a positive optical power, the second prism P2 has a negative optical power, and the absolute value of the optical power of the first prism P1 is less than the absolute value of the optical power of the second prism P2. In some other embodiments, the first lens group G1 has a positive optical power, the first prism P1 has a negative optical power, the second prism P2 has a positive optical power, and the absolute value of the optical power of the first prism P1 is greater than the absolute value of the optical power of the second prism P2.

[0274] Optionally, the optical lens may further include a third lens group. The third lens group may include at least one optical lens. The third lens group is located on the image side of the second prism P2, specifically between the second prism P2 and the image sensor 43. The third lens group can be used to correct aberrations and improve imaging quality.

[0275] It should be understood that the entire optical lens has a positive optical power, that is, it converges the light beam. That is to say, when there is a third lens group, the overall combination of the first lens group, the first prism, the second prism, and the third lens group has a positive optical power. Among them, the third lens group may have a positive optical power or a negative optical power, which is not limited in this application.

[0276] Optionally, the optical lens may further include an infrared filter 42, which is located on the image side of the second prism P2, specifically between the second prism P2 and the image sensor 43. More specifically, the infrared filter 42 is located between the fifth surface S2-2 of the second prism P2 and the image sensor 43. The infrared filter 42 can be used to filter out unnecessary optical signals. In some other embodiments, the optical lens may not be provided with a separate infrared filter. For example, an infrared cut-off film layer is provided on the light-emitting surface of the fifth surface S2-2 of the second prism P2 to filter out unnecessary optical signals. Alternatively, an absorbent material is added to the light-emitting surface of the fifth surface S2-2 of the second prism P2 to filter out unnecessary optical signals.

[0277] Optionally, the optical lens may further include an aperture stop STO, as Figure 14 shown, the aperture stop STO can be disposed on the object side of the first lens group G1. In other embodiments, the aperture stop STO may also be located between the first lens group G1 and the first prism P1. Specifically, the aperture stop STO can be disposed between the fourth lens L4 and the first surface S1-1 of the first prism P1; or, the aperture stop STO may also be located between the first prism P1 and the second prism P2. Specifically, the aperture stop STO can be disposed between the third surface S1-3 of the first prism P1 and the fourth surface S2-1 of the second prism P2; the present application does not limit this. It should be understood that the aperture stop STO can be used to adjust the aperture, filter out stray light, and improve the imaging quality of the lens module 40.

[0278] Among them, the aperture stop STO can be a spacer structure or a variable vane structure; or, the aperture stop STO can be realized by a surface spraying process. For example, an aperture stop STO is formed by spraying a light-shielding material on the lens. Among them, the position of the aperture stop STO can be fixed or variable. For example, the position of the aperture stop STO is variable, and the aperture stop STO can adjust its position according to the focusing situation to be located between different lenses.

[0279] The following presents a possible design of the lens module 40 as shown in Figure 14 in combination with parameter data and simulation results.

[0280] Exemplarily, as Figure 14As shown, the lens module 40 includes a first lens group G1, a first prism P1, a second prism P2, an infrared filter 42, and an image sensor 43, which are arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The refractive index n1 of the first prism P1 is 1.62, and the first included angle θ1 between its first surface S1-1 and second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.54, and the included angle θ2 between its fifth surface S2-2 and sixth surface S2-3 is 25°.

[0281] The first lens group G1 can be wrapped by a mechanical moving part (such as a motor). By changing the relative position between the first lens group G1 and the first prism P1, it is used to image objects at different object distances, and its closest focusing distance is 20 cm. The following introduces the relevant parameters of the lens module 40 as shown Figure 14 in the following.

[0282] Table 5A Basic Parameters of the Lens Module

[0283]

[0284] As can be seen from Table 5A, for the lens module 40 as shown Figure 14 in the following, the total height of the system is 7.04 mm, the shoulder height of the system is 3.53 mm, and the length of the system is 13.1 mm. Compared with the 45° prism solution, they are all reduced to a certain extent, so as to reduce the volume of the lens module. In addition, for the lens module 40 as shown Figure 14 in the following, its closest focusing object distance can reach 200 mm, and it has a good macro effect.

[0285] Table 5B Parameter Table of Moving Parts of the Lens Module at Different Object Distances

[0286]

[0287] As can be seen from Table 5B, at an infinite object distance, the distance between the second surface S1-2 of the fourth lens L4 of the first lens group G1 and the first surface S1-1 of the first prism P1 is 0.513 mm, and the second surface S1-2 is the side of the fourth lens L4 close to the first prism P1. When the lens module 40 is adjusted from an infinite object distance to a 200 mm object distance, the first lens group G1 moves away from the first prism P1 (i.e., moves towards the object side). At a 200 mm object distance, the distance between the second surface S1-2 of the fourth lens L4 and the first surface S1-1 of the first prism P1 is 1.442 mm.

[0288] Figure 15 and Figure 16 show Figure 14The modulation transfer function (MTF) of the lens module 40 at an infinite object distance and a 200 mm object distance. Among them, Figure 15 is the defocus MTF curve of this embodiment at an infinite object distance with a spatial frequency of 125 lp / mm. As can be seen from Figure 15 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction is greater than 0.55 for different fields of view at an infinite object distance. This result indicates that Figure 14 the lens module 40 can achieve high-quality imaging at an infinite object distance. Figure 16 is the defocus MTF curve of this embodiment at a 200 mm object distance with a spatial frequency of 89 lp / mm. As can be seen from Figure 16 , the modulation transfer function (MTF) in the sagittal direction and the meridional direction is greater than 0.65 for different fields of view at a 200 mm macro distance. This result indicates that Figure 14 the lens module 40 can achieve high-quality macro imaging.

[0289] Figure 17 is a schematic structural diagram of another example of the lens module 40 provided by an embodiment of the present application. Among them, Figure 17 in (a) is the state when the lens module 40 captures a distant object, Figure 17 in (b) is the state when the lens module captures a near object.

[0290] It should be noted that Figure 17 the lens module shown is similar in structure to Figure 14 the lens module shown. The main difference between the two is that the setting position of the image sensor 43 is different. Therefore, the relevant descriptions of the first lens group G1, the second lens group G2, the first prism P1, and the second prism P2 can refer to the relevant elaborations in Figure 14 , and will not be repeated here. The following mainly introduces the differences.

[0291] As shown in Figure 17 , the lens module 40 includes a first lens group G1, a first prism P1, a second prism P2, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, and the second prism P2 can form an optical lens, and the image sensor 43 is located on the image side of the optical lens. Among them, the image sensor 43 is arranged parallel to the sixth surface S2-3 (i.e., the second reflection surface S2-3) of the second prism P2.

[0292] It should be understood that the optical path change that occurs in the first prism P1 is the same as that of the lens module shown in Figure 14 , and the optical path change that occurs in the second prism P2 is different from that of the lens module shown in Figure 14 . Specifically, in Figure 17In the lens module 40 shown, the optical axis can be folded three times by setting the first prism P1 and the second prism P2. The second surface S1-2 of the first prism P1 folds the optical axis once; then, the first surface S1-1 of the first prism P1 folds the optical axis again; then, the fifth surface S2-2 of the second prism P2 folds the optical axis for the third time. By setting a longer and more complex optical path in this application, aberration can be better corrected.

[0293] It should be noted that in Figure 17 the specific module 40 shown, the image sensor 43 can be inclined. Specifically, the image sensor 43 can be arranged parallel to the sixth surface S2-3 (i.e., the second reflection surface S2-3) of the second prism P2. The light beam can form an image in the image sensor 43, so that the total height of the system of the electronic device can be reduced to a certain extent. At the same time, the size in the Z direction (i.e., the thickness direction of the electronic device) can be further reduced, thereby further reducing the size of the lens module 40.

[0294] The following presents a possible design of the lens module 40 shown in Figure 17 combination with parameter data and simulation results.

[0295] Exemplarily, as shown in Figure 17 the lens module 40 includes a first lens group G1, a first prism P1, a second prism P2, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The refractive index n1 of the first prism P1 is 1.62, and the first angle θ1 between its first surface S1-1 and the second surface S1-2 is 25°. The refractive index n2 of the second prism P2 is 1.54, and the angle θ2 between its fifth surface S2-2 and the sixth surface S2-3 is 25°.

[0296] The first lens group G1 can be wrapped by a mechanical moving part (such as a motor). By changing the relative position between the first lens group G1 and the first prism P1, it is used to image objects at different object distances, and its closest focusing distance is 20 cm. The following introduces the relevant parameters of the lens module 40 shown in Figure 17 combination with Table 6A and Table 6B.

[0297] Table 6A Basic parameters of the lens module

[0298]

[0299] It should be noted that when the image sensor 43 is tilted, the "total system height" in Table 6A is the vertical distance between the first surface of the first lens (i.e., L1) and the fifth surface S2-2 of the second prism P2, the "shoulder height of the system" is the maximum vertical distance between the fifth surface S2-2 of the second prism P2 and the image sensor 43, and the "system length" is the longest distance of the lens module 40 along the length direction of the electronic device, that is, the vertical distance between the top end of the first lens L1 and the bottom end of the image sensor 43.

[0300] As can be seen from Table 6A, for the lens module 40 as Figure 17 shown, its total system height is 6.27 mm, its shoulder height of the system is 4.57 mm, and its system length is 15.7 mm. Compared with the 45° prism solution, they are all reduced to a certain extent, so as to reduce the volume of the lens module. In addition, for the lens module 40 as Figure 17 shown, its closest focusing object distance can reach 200 mm, and it has a good macro effect.

[0301] Table 6B Parameter Table of Moving Parts of the Lens Module at Different Object Distances

[0302]

[0303] As can be seen from Table 6B, at the infinite object distance, the distance between the second surface S1-2 of the fourth lens L4 of the first lens group G1 and the first surface S1-1 of the first prism P1 is 0.513 mm, and this second surface S1-2 is the side of the fourth lens L4 close to the first prism P1. When the lens module 40 is adjusted from the infinite object distance to the 200 mm object distance, the first lens group G1 moves to the side away from the first prism P1 (i.e., moves towards the object side). At the 200 mm object distance, the distance between the second surface S1-2 of the fourth lens L4 and the first surface S1-1 of the first prism P1 is 1.442 mm.

[0304] Figure 18 is a schematic structural diagram of another example of the lens module 40 provided by the embodiment of the present application. Among them, Figure 18 (a) in is the state when the lens module 40 shoots a distant object, Figure 18 (b) in is the state when the lens module shoots a near object.

[0305] The lens module 40 may include a first lens group G1, a first prism P1, a second lens group G2, a third prism P3, and an image sensor 43 along the optical axis from the object side to the image side. It should be understood that the first lens group G1, the first prism P1, the second lens group G2, and the third prism P3 may form an optical lens, and the image sensor 43 is located on the image side of the optical lens. Among them, the first lens group G1 includes at least one optical lens, and the first lens group G1 has a positive optical power for receiving light beams and converging the light beams. For example, the first lens group G1 may include a first lens L1 and a second lens L2. The second lens group G2 includes at least one optical lens, and the second lens group G2 has a negative optical power. For example, the second lens group G2 may include a third lens L3, a fourth lens L4, and a fifth lens L5.

[0306] The first lens group G1 can focus and image objects at different object distances. The first lens group G1 is a movable lens group. That is to say, the first lens group G1 can be driven by a driving element such as a motor to move the entire first lens group G1 or at least one optical lens in the first lens group G1. For example, the first lens group G1 can be wrapped by a mechanical moving member (such as a motor), and the mechanical moving member can change the relative position between the first lens group G1 and the first prism P1 for imaging objects at different object distances.

[0307] Exemplarily, as Figure 18 shown in (a) of Figure 18 and (b) of

[0308] The first prism P1 is located on the image side of the first lens group G1. The first prism P1 may include at least three characteristic surfaces. For example, the first prism P1 includes a first surface S1-1, a second surface S1-2, and a third surface S1-3. A light beam can enter the first prism P1 from the first surface S1-1 and exit the first prism P1 from the third surface S1-3. Among them, the first surface S1-1 is an incident surface (which can be called the first incident surface), is a transmissive surface, and is also a total reflection (TIR) surface. It transmits the light received from the first lens group G1 and totally reflects the light received from the second surface S1-2 to the third surface S1-3 through TIR; the second surface S1-2 is a reflective surface (which can be called the first reflective surface), and is also a reflective surface coated with a mirror coating. It reflects the light received through the first surface S1-1 back to the first surface S1-1 in the prism; the third surface S1-3 is an exit surface (which can be called the first exit surface), and is also a transmissive surface that transmits the light received from the first surface S1-1. In short, the light beam enters the first prism P1 from the first surface S1-1, is reflected by the second surface S1-2 to the first surface S1-1 and undergoes total reflection at the first surface S1-1, and the reflected light finally exits the first prism P1 through the third surface S1-3. That is to say, the first prism P1 can be configured to fold the optical axis of the optical system twice.

[0309] It should be understood that the first included angle θ1 between the first surface S1-1 and the second surface S1-2 (i.e., the first incident surface and the first reflective surface) is less than 45° (such as θ1 is 25°). Exemplarily, the range of θ1 can be: 0° < θ1 < 10°, 10° ≤ θ1 < 20°, 20° ≤ θ1 < 25°, 25° ≤ θ1 < 30°, 30° ≤ θ1 < 35°, 35° ≤ θ1 < 40°, 40° ≤ θ1 < 45°. Exemplarily, the range of θ1 can be: 22° < θ1 < 28°.

[0310] It should be noted that the value of the first included angle θ1 is related to the refractive index of the first prism P1. In order to satisfy total reflection, the first included angle θ1 and the refractive index n1 of the first prism P1 can satisfy the following relationship: n1 ≥ 1 / sin(2*θ1). In a conventional folded lens system, the angle between the first surface of the first prism and the second surface of the first prism is usually 45°. In this application, by setting the angle between the first surface S1-1 and the second surface S1-2 of the first prism P1 to be less than 45°, that is, reducing the angle between the first surface S1-1 and the second surface S1-2 in the first prism P1, it helps to reduce the height of the lens module in the Z direction (i.e., the thickness direction of the electronic device), thereby helping to reduce the size of the lens module 40.

[0311] The third prism P3 is located on the image side of the first prism P1 or the second lens group G2. The third prism P3 may include at least three characteristic surfaces. For example, the third prism P3 includes a seventh surface S3-1, an eighth surface S3-2, and a ninth surface S3-3. Among them, the seventh surface S3-1 is an incident surface (which can be called the third incident surface) and also a transmission surface, which transmits the light received from the first prism P1 to the eighth surface S3-2 in the prism; the seventh surface S3-1 is also a total reflection (TIR) surface, and the light received from the ninth surface S3-3 is totally reflected to the eighth surface S3-2 through the TIR surface. The eighth surface S3-2 is an exit surface (which can be called the third exit surface) and also a total reflection surface, which totally reflects the light received from the seventh surface S3-1 to the ninth surface S3-3; the eighth surface S3-2 is also a transmission surface, and can transmit the light from the seventh surface S3-1 to form an image in the image sensor 43. The ninth surface S3-3 is a reflective surface coated with a mirror coating (which can be called the third reflective surface), which reflects the light received from the eighth surface S3-2 back to the seventh surface S3-1.

[0312] In short, the light beam enters the third prism P3 from the seventh surface S3-1 (i.e., the third incident surface), and then is totally reflected by the eighth surface S3-2 (i.e., the third exit surface) to the ninth surface S3-3 (i.e., the third reflective surface), and then is reflected by the ninth surface S3-3 (i.e., the third reflective surface) to the seventh surface S3-1 (i.e., the third incident surface), and then is totally reflected by the seventh surface S3-1 (i.e., the third incident surface) to the eighth surface S3-2 (i.e., the third exit surface), and finally exits the third prism P3 from the eighth surface S3-2 (i.e., the third exit surface). That is to say, the third prism P3 can be configured to fold the optical axis of the optical system three times.

[0313] It should be noted that the light undergoes three reflections in the third prism P3 (one or two reflections occur in the above embodiments). The optical path is folded more times in the third prism P3, and the space utilization rate is higher, which is more conducive to the design of a telephoto lens. In addition, as Figure 18 shown by the direction of the light arrow, when the light incident on the third prism P3 undergoes the second reflection, that is, when it is reflected by the ninth surface S3-3 (i.e., the third reflective surface), the light turns upward, which can make the optical axis of the light exiting the third prism P3 move upward, thereby further reducing the length of the optical system.

[0314] It should be understood that the angle between the seventh surface S3-1 and the ninth surface S3-3 (i.e., the third incident surface and the third reflection surface) is equal to the angle between the eighth surface S3-2 and the ninth surface S3-3 (i.e., the third exit surface and the third reflection surface). Denote the angle formed between the seventh surface S3-1 and the ninth surface S3-3 (i.e., the third incident surface and the third reflection surface) or the eighth surface S3-2 and the ninth surface S3-3 (i.e., the third exit surface and the third reflection surface) as the third angle θ3. The third angle θ3 is twice the first angle θ1, i.e., θ3 = 2θ1, and the third angle θ3 is less than 90° and greater than 40°.

[0315] It should be noted that, for the first prism P1 and the third prism P3, the higher the refractive index of the prism material, the better, and the lower the dispersion coefficient, the better. Prisms with higher refractive indices are more likely to undergo total internal reflection. Exemplarily, the refractive indices of the first prism P1 and the third prism P3 are both greater than 1.5, and the Abbe number is greater than 40.

[0316] It should be understood that by arranging the second lens group G2 between the first prism P1 and the third prism P3, the lens module 40 can have good macro performance, achieving an optical magnification of 0.1 times or more and a macro focusing distance of less than 20 cm.

[0317] It should be understood that the optical axis of the third surface S1-3 of the first prism P1 coincides with the optical axis of the second lens group G2, and the optical axis of the seventh surface S3-1 of the third prism P3 coincides with the optical axis of the second lens group G2. That is to say, the coaxial system is adopted in this application. By using the coaxial system for the optical lens, compared with the off-axis system, off-axis aberrations will not occur. The prisms and lenses in the coaxial system can all adopt a centrosymmetric structure, which is convenient for production and manufacturing and has strong feasibility. In addition, compared with the off-axis system, it is easier to find the center point of the prisms and lenses in the coaxial system, which is convenient for the assembly of each lens and prism in the optical lens.

[0318] In some embodiments, as Figure 18 shown, the first surface S1-1, the second surface S1-2, and the third plane S1-3 of the first prism P1 can all be planes, and the seventh surface S3-1, the eighth surface S3-2, and the ninth surface S3-3 of the third prism P3 are all planes.

[0319] In some other embodiments, the first surface S1-1 of the first prism P1 is a plane, and the second surface S1-2 and / or the third plane S1-3 of the first prism P1 can be surfaces with optical power.

[0320] Exemplarily, in order to make the first prism P1 form a surface with optical power, the lens in the second lens group G2 can be fixedly connected to the first exit surface (i.e., the third plane S1-3) of the first prism P1 through a gluing process.

[0321] In Figure 18 In the lens module 40 shown, the image sensor 43 is located on the image side of the optical lens and on the image side of the third prism P3. The image sensor 43 can be arranged parallel to the eighth surface S3-2 (i.e., the third exit surface) of the third prism P3, so that the third prism P3 can fold the light beam three times, and the first prism P1 and the third prism P3 can fold the light beam five times. The second surface S1-2 of the first prism P1 folds the light beam once; then, the first surface S1-1 of the first prism P1 folds the light beam a second time; then, the eighth surface S3-2 of the third prism P3 folds the light beam again; then, the ninth surface S3-3 of the third prism P3 folds the light beam a fourth time; then, the seventh surface S3-1 of the third prism P3 folds the light beam a fifth time; so that the light beam finally enters the image sensor 43. By setting a longer and more complex optical path in this application, the aberration can be better corrected, the space utilization rate is higher, and it is more conducive to the design of telephoto lenses.

[0322] It should be understood that the entire optical lens has a positive optical power, that is, the absolute value of the optical power of the first lens group G1 is greater than the absolute value of the optical power of the second lens group G2.

[0323] In one example, L1 can have a positive optical power, L2 can have a negative optical power, and L1 and L2 as a whole (i.e., the first lens group G1) have a positive optical power. In this example, by setting L1 to have a positive optical power and L2 to have a negative optical power, it is beneficial to control the aberration of the light beam passing through the first lens group G1, making it easier for the first lens group G1 to correct aberration and the optical lens to have better imaging quality. In other examples, L1 can have a positive optical power and L2 can also have a positive optical power, and this application does not make any limitations in this regard.

[0324] It should be understood that at least one of the three lenses in the second lens group G2 has a positive optical power and at least one has a negative optical power, and the specific optical powers of L3, L4, and L5 are not limited. For example, L3 can have a positive optical power, L4 can have a negative optical power, and L5 can have a negative optical power (or a positive optical power), and the whole formed by L3, L4, and L5 (i.e., the second lens group G2) has a negative optical power.

[0325] Optionally, the optical lens may further include a third lens group. The third lens group may include at least one optical lens. The third lens group can be located on the image side of the third prism P3, specifically between the third prism P3 and the image sensor 43. The third lens group can be used to correct aberration and improve imaging quality.

[0326] It should be understood that the entire optical lens has a positive optical power, that is, it converges the light beam. That is to say, when there is a third lens group, the overall formed by the first lens group, the second lens group and the third lens group has a positive optical power. Among them, the third lens group can have a positive optical power or a negative optical power, which is not limited in this application.

[0327] It should be noted that, in order to better correct aberrations, the more lenses provided in the optical lens, the better. However, limited by the total height of the optical lens system and the size of the electronic device, the number of lenses included in the optical lens in the embodiments of this application can be 3 to 5. For example, the first lens group G1 can include 1 lens, and the second lens group G2 can include 4 lenses. Another example is that the first lens group G1 can include 2 lenses, and the second lens group G2 can include 3 lenses. Another example is that the first lens group G1 can include 1 lens, the second lens group G2 can include 1 lens, and the third lens group G3 can include 1 lens.

[0328] Optionally, the optical lens may further include an infrared filter 42, which is located on the image side of the third prism P3, specifically between the third prism P3 and the image sensor 43. More specifically, the infrared filter 42 is located between the eighth surface S3-2 of the third prism P3 and the image sensor 43. The infrared filter 42 can be used to filter out unnecessary optical signals. In some other embodiments, the optical lens may not be provided with an infrared filter separately. For example, an infrared cut-off film layer is provided on the light-emitting surface of the eighth surface S3-2 of the third prism P3 to filter out unnecessary optical signals. Or, an absorbent substance is added to the light-emitting surface of the eighth surface S3-2 of the third prism P3 to filter out unnecessary optical signals.

[0329] Optionally, the optical lens may further include an aperture stop STO, as Figure 18 shown, the aperture stop STO can be located on the object side of the first lens group G1, which can reduce the total height of the optical lens system. In some other embodiments, the aperture stop STO can also be provided between the first lens group G1 and the first prism P1. In some other embodiments, the aperture stop STO can also be located between the first prism P1 and the second lens group G2, or between the second lens group G2 and the third prism P3. It should be understood that the aperture stop STO can be used to adjust the aperture, filter out stray light, and improve the imaging quality of the lens module 40.

[0330] Among them, the aperture stop STO can be a spacer structure or a variable vane structure; or, the aperture stop STO can be realized by a surface spraying process. For example, the aperture stop STO is formed by spraying a light-shielding material on the lens. Among them, the position of the aperture stop STO can be fixed or variable. For example, the position of the aperture stop STO is variable, and the aperture stop STO can adjust its position according to the focusing situation to be located between different lenses.

[0331] Combined with the parameter data and simulation results below, a possible design of the lens module 40 is presented as Figure 18 shown.

[0332] Exemplarily, as Figure 18 shown, the lens module 40 includes a first lens group G1, a first prism P1, a second lens group G2, a third prism P3, and an image sensor 43 arranged in sequence from the object side to the image side. Among them, the first lens group G1 includes a first lens L1 and a second lens L2, and the second lens group includes a third lens L3, a fourth lens L4, and a fifth lens L5. The refractive index n1 of the first prism P1 can be 1.74, and the first included angle θ1 between its first surface S1-1 and second surface S1-2 can be 25°. The refractive index n2 of the third prism P3 can be 1.70, and the included angle θ3 between its seventh surface S3-1 and ninth surface S3-3 or between its eighth surface S3-2 and ninth surface S3-3 can be 50°.

[0333] The first lens group G1 can be wrapped by a mechanical moving part (such as a motor). By changing the relative position between the first lens group G1 and the first prism P1, objects with different object distances can be imaged, and its closest focusing distance is 100 cm. The relevant parameters of the lens module 40 shown as Figure 18 below are introduced in combination with Table 7.

[0334] Table 7 Basic Parameters of the Lens Module

[0335]

[0336] It should be noted that when the image sensor 43 is vertically arranged, the "total system height" in Table 7 is the vertical distance between the first surface of the first lens (i.e., L1) and the image sensor 43, the "shoulder height of the system" is the vertical distance between the first surface S1-1 of the first prism P1 and the image sensor 43, and the "system length" is the longest distance of the lens module 40 along the length direction of the electronic device, that is, the vertical distance between the top end of the first lens L1 and the bottom end of the image sensor 43.

[0337] It can be seen from Table 7 that for the lens module 40 shown as Figure 18 shown, its system length is 12.7 mm. Compared with the scheme of the above embodiment, Figure 18 the system length of the lens module 40 shown is reduced to a certain extent, so that the volume of the lens module can be reduced.

[0338] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. An optical lens, characterized in that: The lens comprises a first lens group, a first prism, a second lens group and a second prism, which are arranged in sequence from the object side to the image side. The first mirror group includes at least one lens, the first mirror group has positive optical power, and the first mirror group is used to receive light and converge the light; The first prism comprises a first incident surface, a first reflection surface and a first exit surface, a first angle between the first incident surface and the first reflection surface is less than 45°, and an optical axis of the first exit surface coincides with an optical axis of the second mirror group; The second lens group includes at least one lens, and the second lens group has negative optical power; The second prism includes a second incident surface, a second reflection surface and a second exit surface, a second angle between the second reflection surface and the second exit surface is less than 45°, and the second angle is equal to the first angle, and the optical axis of the second incident surface coincides with the optical axis of the second mirror group.

2. The optical lens according to claim 1, characterized in that: The first angle θ1 and the refractive index n1 of the first prism satisfy: n1≥1 / sin(2*θ1).

3. The optical lens according to claim 1 or 2, characterized in that: The second angle θ2 and the refractive index n2 of the second prism satisfy: n2≥1 / sin(2*θ2).

4. The optical lens according to any one of claims 1 to 3, characterized in that: The first lens group is a movable lens group. When the optical lens switches from a distant view to a near view during focusing, the first lens group moves along the optical axis toward the object side.

5. The optical lens according to any one of claims 1 to 3, characterized in that: The first lens group includes at least one variable lens. During the focusing process of the optical lens switching from a distant view to a near view, the optical focal length of the variable lens in the first lens group increases.

6. The optical lens according to claim 5, wherein the second lens group comprises at least one variable lens, and the variable lens in the second lens group is used to correct additional aberrations caused by the variable lens in the first lens group.

7. The optical lens according to any one of claims 1 to 6, characterized in that: The first exit surface is a plane, the second lens group includes a first lens, the object side surface of the first lens is a plane, and the first lens is fixedly connected to the first exit surface of the first prism through a gluing process.

8. The optical lens according to any one of claims 1 to 7, characterized in that: The second incident surface is a plane, the second lens group includes a second lens, the image side surface of the second lens is a plane, and the second lens is fixedly connected to the second incident surface of the second prism by a gluing process.

9. The optical lens according to any one of claims 1 to 8, characterized in that: The optical lens also includes an aperture stop, which is located on the object side of the first lens group, or between the first lens group and the first prism, or between the first prism and the second lens group, or between the second lens group and the second prism.

10. The optical lens according to any one of claims 1 to 9, characterized in that: The optical lens further includes an infrared filter, and the infrared filter is located on the image side of the second prism.

11. The optical lens according to any one of claims 1 to 10, characterized in that: The optical lens further includes a third lens group, the third lens group includes at least one lens, and the third lens group is located on the image side of the second prism.

12. An optical lens, characterized in that: The lens comprises a first lens group, a first prism and a second prism which are arranged in sequence from the object side to the image side. The first mirror group includes at least one lens, the first mirror group has positive optical power, and the first mirror group is used to receive light and converge the light; The first prism comprises a first incident surface, a first reflecting surface and a first emitting surface, and a first angle between the first incident surface and the first reflecting surface is less than 45°; The second prism comprises a second incident surface, a second reflection surface, and a second exit surface, a second angle between the second reflection surface and the second exit surface is less than 45°, and the second angle is equal to the first angle, and an optical axis of the second incident surface coincides with an optical axis of the first exit surface; The first exit surface has optical focal length, the second incident surface has optical focal length, and the optical focal length of the second incident surface is opposite to that of the first exit surface. The first prism and the second prism as a whole have negative optical focal length.

13. The optical lens according to claim 12, characterized in that: The first angle θ1 and the refractive index n1 of the first prism satisfy: n1≥1 / sin(2*θ1).

14. The optical lens according to claim 12 or 13, characterized in that: The second angle θ2 and the refractive index n2 of the second prism satisfy: n2≥1 / sin(2*θ2).

15. The optical lens according to any one of claims 12 to 14, characterized in that: The first lens group is a movable lens group. When the optical lens switches from a distant view to a near view during focusing, the first lens group moves along the optical axis toward the object side.

16. The optical lens according to any one of claims 12 to 14, characterized in that: The first lens group includes at least one variable lens. During the focusing process of the optical lens switching from a distant view to a near view, the optical focal length of the variable lens in the first lens group increases.

17. The optical lens according to any one of claims 12 to 16, characterized in that: The optical lens also includes a first lens, and the first lens is fixedly connected to the first exit surface through a gluing process to form a surface of the first prism with optical power.

18. The optical lens according to any one of claims 12 to 17, characterized in that: The optical lens also includes a second lens, and the second lens is fixedly connected to the second incident surface through a gluing process to form a surface of the second prism with optical power.

19. The optical lens according to any one of claims 12 to 16, characterized in that: The first prism and / or the second prism are / is an integrally processed prism with optical power.

20. The optical lens according to any one of claims 12 to 19, characterized in that: The optical lens further includes an aperture stop, which is located on the object side of the first lens group, or between the first lens group and the first prism, or between the first prism and the second prism.

21. The optical lens according to any one of claims 12 to 20, characterized in that: The optical lens further includes an infrared filter, and the infrared filter is located on the image side of the second prism.

22. The optical lens according to any one of claims 12 to 21, characterized in that: The optical lens further includes a third lens group, the third lens group includes at least one lens, and the third lens group is located on the image side of the second prism.

23. An optical lens, characterized in that: The lens comprises a first lens group, a first prism, a second lens group and a third prism which are arranged in sequence from the object side to the image side. The first mirror group includes at least one lens, the first mirror group has positive optical power, and the first mirror group is used to receive light and converge the light; The first prism comprises a first incident surface, a first reflection surface and a first exit surface, a first angle between the first incident surface and the first reflection surface is less than 45°, and an optical axis of the first exit surface coincides with an optical axis of the second mirror group; The second lens group includes at least one lens, and the second lens group has negative optical power; The third prism includes a third incident surface, a third reflection surface and a third exit surface, the angle between the third incident surface and the third reflection surface is equal to the angle between the third exit surface and the third reflection surface, and a third angle formed between the third incident surface and the third reflection surface is twice the first angle, the third angle is less than 90° and greater than 40°, and the optical axis of the third incident surface coincides with the optical axis of the second mirror group.

24. The optical lens according to claim 23, characterized in that: The first angle θ1 and the refractive index n1 of the first prism satisfy: n1≥1 / sin(2*θ1).

25. The optical lens according to claim 23 or 24, characterized in that: The first lens group is a movable lens group. When the optical lens switches from a distant view to a near view during focusing, the first lens group moves along the optical axis toward the object side.

26. The optical lens according to claim 23 or 24, characterized in that: The first lens group includes at least one variable lens. During the focusing process of the optical lens switching from a distant view to a near view, the optical focal length of the variable lens in the first lens group increases.

27. The optical lens according to claim 26, wherein the second lens group comprises at least one variable lens, and the variable lens in the second lens group is used to correct additional aberrations caused by the variable lens in the first lens group.

28. The optical lens according to any one of claims 23 to 27, characterized in that: The first exit surface is a plane, the second lens group includes a first lens, the object side surface of the first lens is a plane, and the first lens is fixedly connected to the first exit surface of the first prism through a gluing process.

29. The optical lens according to any one of claims 23 to 28, characterized in that: The optical lens also includes an aperture stop, which is located on the object side of the first lens group, or between the first lens group and the first prism, or between the first prism and the second lens group, or between the second lens group and the third prism.

30. The optical lens according to any one of claims 23 to 29, characterized in that: The optical lens further includes an infrared filter, and the infrared filter is located on the image side of the third prism.

31. The optical lens according to any one of claims 23 to 30, characterized in that: The optical lens further includes a third lens group, the third lens group includes at least one lens, and the third lens group is located on the image side of the third prism.

32. A lens module, characterized in that: The optical lens comprises an image sensor and the optical lens as claimed in any one of claims 1 to 11, or comprises an image sensor and the optical lens as claimed in any one of claims 12 to 22, wherein the optical lens is used to image the scene on the object side onto the image sensor.

33. The lens module according to claim 32, characterized in that: The image sensor is located on the image side of the optical lens and is arranged parallel to the second exit surface.

34. The lens module according to claim 32, characterized in that: The image sensor is located on the image side of the optical lens and is arranged parallel to the second reflective surface.

35. A lens module, characterized in that: The optical lens comprises an image sensor and any one of claims 23 to 31, wherein the optical lens is used to image the scene on the object side onto the image sensor.

36. The lens module according to claim 35, characterized in that: The image sensor is located on the image side of the optical lens and is arranged parallel to the third exit surface.

37. An electronic device, characterized in that: It comprises an image processor and a lens module as described in any one of claims 32 to 36, wherein the image processor is communicatively connected to the lens module, and the image processor is used to obtain image data from the lens module and process the image data.

Images