Folding optical lens, folding optical lens camera module and camera module array

Abstract

The invention provides a folding optical lens, the folding optical lens sequentially comprises a lens group and a folding element along a light path, the folding element is provided with at least three reflecting surfaces, the at least three reflecting surfaces reflect light rays for odd times, the folding element is provided with a first transmission surface and a second transmission surface, and the first transmission surface and the second transmission surface are opposite to each other. The folding element is configured to transmit light passing through the lens group into the folding element through the first transmission surface, the light reaches an imaging surface through the second transmission surface, and the length of the lens group arranged in front of the folding element relative to the imaging surface in the height direction is the convex part length recorded as tlt, the length of the folding element relative to the imaging surface in the height direction is the shoulder length and is recorded as ttlj, and the following relational expression is met: tlt / ttlj is more than or equal to 0.768 and less than or equal to 1.1, so that the compact folding optical lens with multiple reflection times is realized.

Description

Technical Field

[0001] The present application relates to a folding optical lens, and more particularly to a folding optical lens and a folding optical lens camera module that perform multiple reflections on light to achieve light path folding. Background Art

[0002] Telephoto camera modules usually have a relatively long focal length, which is very suitable for taking photos at a long distance. The long-distance shooting capability of telephoto camera modules can bring a different experience to users, so now mobile phones, especially the flagship models of mobile phone manufacturers, are equipped with telephoto camera modules. However, small mobile devices such as mobile phones, tablets, tablets or wearable devices require the overall device to have a thinner size, and the industry has created a demand for high-resolution and small-sized camera modules for easy integration into the device. Telephoto camera modules are difficult to miniaturize due to their long focal length. More specifically, the optical design of a telephoto lens with a small size and high-quality imaging can produce a telephoto camera module with a small size and high-quality imaging.

[0003] In the prior art, the distance from the upper surface of the shoulder structure of the camera module to the bottom of the camera module is the camera module shoulder height. The camera module shoulder height determines the height of the camera module shoulder and also determines the thickness of the back panel of the camera module array area of ​​the mobile phone. In order to effectively reduce the overall thickness of the mobile phone and make the mobile phone thinner, the industry now needs an optical lens design that can achieve telephoto shooting and low shoulder height. Summary of the invention

[0004] In view of the above problems, the present application provides a folded optical lens, which includes a lens group and a folded element in sequence along an optical path, the lens group includes at least four optical elements, the folded element has at least three reflecting surfaces, the at least three reflecting surfaces reflect the light a total of an odd number of times, the folded element has a first transmission surface and a second transmission surface, the folded element is configured to transmit the light passing through the lens group into the folded element via the first transmission surface, the three reflection surfaces are a first reflection surface, a second reflection surface and a third reflection surface, the first reflection surface reflects the light transmitted through the first transmission surface, the second reflection surface reflects the light transmitted through the first transmission surface, and the third reflection surface reflects the light transmitted through the first transmission surface. The reflecting surface reflects the light reflected by the first reflecting surface, the third reflecting surface reflects the light reflected by the second reflecting surface, the light reaches the imaging surface via the second transmitting surface, the length of the lens group arranged in front of the folding element relative to the imaging surface in the height direction is the convex length recorded as ttlt, the length of the folding element relative to the imaging surface in the height direction is the shoulder length recorded as ttlj, and the following conditions are satisfied: 0.768≤ttlt / ttlj≤1.1. By reasonably distributing the optical length, the folded optical lens has a lower shoulder and a less protruding convex portion, so as to obtain a folded optical lens with a relatively reasonable size.

[0005] The present application also provides a folding optical lens camera module, wherein the folding optical lens camera module includes a folding optical lens, and the folding optical lens camera module has a convex portion and a shoulder portion, wherein the height of the convex portion is ttltm, and the height of the shoulder is ttljm, satisfying the following relationship: 1.061<ttltm / ttljm<1.514, and a folding optical lens camera module with a relatively reasonable size is obtained through the reasonable distribution of the optical length.

[0006] The present application provides a camera module array, including a first camera module, the first camera module having a first light hole, the first light hole is circular, a folded optical lens camera module, the folded optical lens camera module including a folded optical lens, the folded optical lens having a folded optical lens light hole, the folded optical lens light hole is circular, the diameter of the first light hole is R1, the diameter of the folded optical lens light hole is R2, the shoulder height of the first camera module is ttl1m, the shoulder height of the folded optical lens camera module is ttlzm, satisfying the following relationship: ttl1m≤7.5mm, ttlzm≤7.5mm, 0.7<R2 / R1<1.5, and being able to provide a camera module array whose light holes are all circular in appearance, and the light hole diameters of each camera module are relatively consistent, with a unified and coordinated aesthetic.

[0007] Further objectives and advantages of the present application will be fully reflected through understanding of the following description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0009] Figure 1 A structural diagram of an optical system according to an embodiment of the present application is shown.

[0010] Figure 2 A schematic structural diagram of a metalens according to an embodiment of the present application is shown.

[0011] Figure 3 A schematic diagram showing a structural comparison between an embodiment of the present application and the prior art is shown.

[0012] Figure 4 A schematic diagram showing a structure in which an embodiment of the present application is mounted on a terminal.

[0013] Figure 5 A structural diagram of an optical system according to another embodiment of the present application is shown.

[0014] Figure 6 The optical system structure diagram of another embodiment of the present application is shown.

[0015] Figure 7 The optical system structure diagram of another embodiment of the present application is shown.

[0016] Figure 8 The optical system structure diagram of another embodiment of the present application is shown.

[0017] Fig. 9 The optical system structure diagram of another embodiment of the present application is shown.

[0018] Fig.10 A schematic diagram comparing the structure of a terminal equipped with an embodiment of the present application and a terminal in the prior art is shown. DETAILED DESCRIPTION

[0019] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0020] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0022] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, a contact connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Attached Figure 1 The folded optical lens 1 of the present application is shown in FIG. 1 , which includes a lens group 10 and a folded element 20 in sequence along the optical path. The lens group 10 includes at least four optical elements. The folded element 20 has at least three reflective surfaces. The at least three reflective surfaces reflect the light a total of an odd number of times. Figure 1 As shown, at least three reflective surfaces are used in the present application to increase the reflective surface utilization rate of the folding element 20, and multiple physical surfaces of the folding element 20 are used, thereby reducing the optical size required for the folding element 20. The present application also adopts a method of reflecting the light a total of an odd number of times, which makes it easier to set the imaging surface 30 on the same side of the folding element 20 relative to the lens group 10, thereby achieving the effect of reducing the size of the folded optical lens 1.

[0025] The folding element 20 has a first transmission surface and a second transmission surface. The folding element 20 is configured to transmit the light passing through the lens group 10 into the folding element 20 via the first transmission surface. The three reflection surfaces are the first reflection surface, the second reflection surface and the third reflection surface. The first reflection surface reflects the light transmitted via the first transmission surface, the second reflection surface reflects the light reflected via the first reflection surface, and the third reflection surface reflects the light reflected via the second reflection surface. The folding element 20 has a second transmission surface, and the light reaches the imaging surface 30 via the second transmission surface. This design enables the folding element 20 to reflect the light at least three times, and both transmission surfaces of the folding element 20 can be arranged on the folding element 20 to reduce the compactness of the folding element 20. In addition, it is also relatively easy to arrange the modified imaging surface 30 on the side of the folding element 20 relative to the lens group 10, thereby achieving the effect of reducing the size of the folded optical lens 1.

[0026] The length of the lens group 10 in the height direction relative to the imaging surface 30 is denoted as ttlt, and the length of the folding element 20 in the height direction relative to the imaging surface 30 is denoted as ttlj, which satisfies the following condition: 0.768≤ttlt / ttlj≤1.1. Generally speaking, the more times the light is folded, the more the unidirectional light length of the telephoto optical system can be distributed in different directions to reduce the overall size of the optical system. In the present application, at least three reflective surfaces are used to achieve at least three light reflections, thereby distributing the unidirectional light length in different directions to reduce the size of the folded optical lens 1. In addition, by designing the optical path in which the at least three reflecting surfaces reflect the light a total of an odd number of times, the light can be reflected an odd number of times inside the folding element 20, so that the light finally emitted from the folding element 20 is arranged in the direction of the side of the folding element 20 close to the lens group 10 as much as possible. In simple terms, the light finally emitted from the folding element 20 is arranged on the upper side of the folding element 20 as much as possible, so that the imaging surface 30 and the lens group 10 are arranged on the same side of the folding element 20, thereby reducing the height of the folded optical lens 1.

[0027] Reference Figure 2 As shown, in the present application, the folding element 20 can adopt a design such as a polygonal prism, and utilize the three reflection surfaces inside the polygonal prism to fold the light multiple times, so that the light can be folded more than three times inside the prism before leaving the quadrilateral prism and reaching the imaging surface 30. Since the polygonal prism can have multiple surfaces, for example, at least six surfaces, the quadrilateral prism can be designed to have a thin thickness. Specifically, an embodiment of the present application can adopt a prism with a parallelogram cross-section, and the length between the first structural surface 21 and the third structural surface 23 of the prism can have a smaller value, so that the light can be folded multiple times. In this way, the prism can be reduced in at least the height direction (the height along the optical axis direction of the lens group 10 or the Z-axis direction), and thus the overall size of the folded optical lens 1 can be reduced.

[0028] Still refer to the attached Figure 1As shown, in the present application, the lens group 10 includes at least four plastic lenses, namely the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14. The lens group 10 has an optical axis O. The relative distance in the optical axis direction from the object-side surface L1S1 of the first lens 11 to the image-side surface of the last lens is L, satisfying the following relationship: 4.35 < L < 5.78. When this condition is met, it helps to reduce the total length of the optical system of the folding optical lens 1, making the structure of the folding optical lens 1 more compact. Additionally, in the present application, using lenses formed of plastic materials helps to reduce the manufacturing cost of the folding optical lens 1. More simply, the present application can use 1 cuboid and 2 triangular prisms to assemble and form a polygonal prism.

[0029] In the present application, the focal length of the folding optical lens 1 is f, and the entrance pupil diameter of the folding optical lens 1 is EPD, satisfying the following relationship: 2.04 < f / EPD < 2.97, which can enable the optical system of the folding optical lens 1 to have a larger aperture number, facilitating an increase in the amount of incident light and thus improving the imaging quality.

[0030] In the present application, the total length of the optical system of the folding optical lens 1 is TTL, satisfying the following relationship: 7.3 < TTL < 11.5. Referring to the attached Figure 1 figure, TTL represents the length from the object-side surface of the first lens 11 to the bottom surface of the folding element 20 as TTL. Meeting this relationship helps to compress the total length of the optical system of the folding optical lens 1, making the structure of the folding optical lens 1 more compact.

[0031] In the present application, the distance of the folding element 20 in the height direction is the thickness of the folding element 20 denoted as Lj, satisfying the following relationship: 2.92 < Lj < 3.88, which helps to compress the total length of the optical system of the folding optical lens 1, making the structure of the folding optical lens 1 more compact.

[0032] In this application, the structural surface of the folding element 20 close to the lens group 10 is the first structural surface 21. The structural surface of the folding element 20 that intersects with the first structural surface 21 but is far from the imaging surface 30 is the second structural surface 22. The structural surface of the folding element 20 that intersects with the second structural surface 22 but is parallel to the first structural surface 21 is the third structural surface 23. The structural surface of the folding element 20 that intersects with the first structural surface 21 but is close to the imaging surface 30 is the fourth structural surface 24. The angle between the first structural surface 21 and the second structural surface 22 is θ1, and the angle between the first structural surface 21 and the fourth structural surface 24 is θ2. The following relationship is satisfied: 28.6 < θ1 < 35.7, θ1 = θ2. Thus, the light incident on the folding element 20 can undergo multiple total internal reflections in the folding element 20, which helps to shorten the total optical system length of the folding optical lens 1. On the other hand, in some embodiments, the folding element 20 is a quadrilateral prism, and the manufacturing process is relatively simple. The quadrilateral prism uses the four structural surfaces on the top, bottom, left, and right as optical surfaces to achieve the reflection and transmission of the optical path, and reflection can be performed on the four structural surfaces on the top, bottom, left, and right, thereby shortening the total optical system length of the folding optical lens 1.

[0033] The first transmission surface is disposed in the area of the first structural surface 21 corresponding to the lens group 10. The second transmission surface is disposed in the area of the first structural surface 21 corresponding to the imaging surface 30.

[0034] In this application, the length of the folding element 20 in the height direction relative to the imaging surface 30 is the shoulder length, denoted as ttlj. The ttlj is equivalent to the maximum distance between the third structural surface 23 and the imaging surface 30 in the height direction. The total optical system length of the folding optical lens 1 is TTL. The following relationship is satisfied: 0.43 < ttlj / TTL < 0.53. Since the third structural surface 23 is the bottom surface of the folding element 20, the height between the third structural surface 23 and the imaging surface 30 is equivalent to the height of the back focal length provided by the folding element 20 from the lens group 10 to the imaging surface 30 in the optical design. This height can distribute the optical path length of the folding optical lens 1 in this application, which helps to compress the total optical system length of the folding optical lens 1 and make the structure of the folding optical lens 1 more compact.

[0035] In this application, the total optical system length of the folding optical lens 1 is TTL. TTL is equivalent to the sum of the convex part distance and the shoulder distance of the folding optical lens 1, that is, TTL = ttlt + ttlj. The height difference in the vertical direction between the optical axis of the lens group 10 and the center of the imaging surface 30 is H, and the following relationship is satisfied: 0.81 < H / TTL < 1.36. When this condition is met, it helps to compress the total optical system length of the folding optical lens 1, reduce the height of the folding optical lens 1, and make the structure of the folding optical lens 1 more compact.

[0036] In this application, the total optical system length of the folding optical lens 1 is TTL, and the focal length of the folding optical lens 1 is f. The following relationship is satisfied: 0.51 < f / TTL < 0.64. When this condition is met, it helps to reduce the total length of the optical system of the folding optical lens 1 and obtain a longer focal length.

[0037] Appendix Figure 3 Fig. shows the size range diagram of a camera module of this application. The imaging surface 30 of the folding optical lens camera module 100 of this application is arranged on the side direction of the folding element 20 close to the lens group 10. Briefly speaking, in this application, both the imaging surface 30 and the lens group 10 are arranged above the folding element 20, and the imaging surface 30 corresponds to the photosensitive chip in the actual camera module structure. In the camera module, the photosensitive chip structure part will include the photosensitive chip and the circuit board assembled by the photosensitive chip, etc. The overall height of the photosensitive chip structure depends on the thickness of the circuit board, the thickness of the photosensitive chip, etc. Those skilled in the art should know that because the assembly method of the photosensitive chip determines that the backside structure part of the photosensitive chip can include the circuit board and / or steel sheet, or glue, etc. arranged between the photosensitive chip and the circuit board. From the overall perspective of optical design to camera module manufacturing, since the thickness of the color filter and the gap between the color filter and the photosensitive chip are also determined when the optical design is determined, the thickness of the circuit board, the thickness of the photosensitive chip, and the glue between the photosensitive chip and the circuit board will form the overall thickness of the photosensitive component in this application. The structure of arranging the imaging surface 30 above the folding element 20 in this application will increase the shoulder height of the camera module when manufacturing the camera module. However, since the thickness of the folding element 20 of this application can be made small, the overall shoulder height can still meet the requirements. This application is based on reducing the size of the camera module and can adapt to the design requirements of compact terminals. Those skilled in the art should know that the shoulder height part of the camera module refers to the part of the structure of the camera module that can be accommodated under the terminal backplane when the camera module is mounted on the terminal. For example, when the terminal is a mobile phone, the shoulder height part of the camera module refers to the shoulder height structure where the camera module can be accommodated under the backplane. The height of the shoulder height part determines the thickness of the backplane where the camera module is placed on the mobile phone, and generally also determines the overall thickness of the mobile phone. Therefore, the lower the height of the shoulder height part, the smaller the thickness of the mobile phone.

[0038] Generally speaking, from the overall process of optical design to camera module manufacturing, the shoulder height of the lens in the optical design will affect the shoulder height of the camera module. The lower the shoulder height of the optical design, the smaller the shoulder height of the camera module will be. When the optically designed lens is manufactured into a camera module, the shoulder height of the camera module is equivalent to the shoulder height of the lens in the optical design plus, for example, the thickness of the lens barrel, and / or the thickness of the motor in the camera module, and / or the thickness of the structural parts, and / or the thickness of the mirror wall, and / or the size of the gap avoidance, etc. These sizes may cause the shoulder height of the camera module to become higher. In the present application, a structure is adopted in which the imaging surface 30 is arranged on the upper side of the folding element 20, so that in the camera module state, the photosensitive chip and the lens group 10 are located on the same side of the folding element 20, thereby achieving the height dimension of the lens group 10 in the height direction of the camera module structure covering the height dimension of the photosensitive chip, so as to reduce the total height of the camera module. Refer to the attached Figure 3 As shown, when the photosensitive chip is arranged on the lower side of the folding element 20, the actual manufactured camera module will extend downward due to the thickness of the photosensitive chip, and the size of the photosensitive chip and its related structures will extend downward, thereby increasing the total height of the camera module. Therefore, in the present application, the imaging surface 30 and the lens group 10 are arranged on the same side of the folding element 20, so as to achieve the effect of reducing the overall height of the camera module.

[0039] Specifically, Figure 3 A folded optical lens camera module 100 of the present application and a prior art are illustrated in the figure. In the prior art, the total thickness of the photosensitive chip, color filter, the gap between the color filter and the photosensitive chip, and the circuit board thickness of the camera module 100A is 0.7-0.9mm. Generally, the industry believes that the components made of photosensitive chips, color filters and circuit boards are called color filter components, IR components, photosensitive chip components, etc. Generally, the industry believes that the thickness of the IR component (the component made of photosensitive chips, color filters and circuit boards) is about 0.7-0.9mm, which is higher than the structural thickness added by the folding element 20 of the present application when it is manufactured into a camera module. Generally speaking, when the folding element 20 of the present application is manufactured into a camera module, it is considered to increase the structural wall thickness of the lens barrel in the lens by 0.2mm. In this embodiment, since the folding element 20 does not need a motor to drive, the folding element 20 is directly installed on the structural surface of the camera module. The thickness of the lens barrel structure of the present application is 0.2-0.3mm. Therefore, the method of arranging a photosensitive chip on the folding element 20 in the present application can reduce the height of the folded optical lens 1 when it is manufactured into a camera module, and compared with the attached Figure 3 Compared with the existing technology, the total height can be reduced by 0.4-0.7mm. Figure 3The total height (ttl1) of the folded optical lens 1 of the present application when manufactured into a camera module is equivalent to the TTL height of the optical design of the folded optical lens 1 plus the structural thickness, while the prior art reference attached Figure 3 The total height (ttl2) of the camera module 100A is equivalent to the TTL height of the optical design of the folding optical lens 1 plus the thickness of the IR component. Obviously, ttl1<ttl2. Therefore, when the optical design of the folding optical lens 1 of the present application is manufactured into a camera module, the total height of the camera module can be reduced, so that when the camera module manufactured by the folding optical lens 1 of the present application is installed in a mobile phone terminal, the thickness of the mobile phone can be reduced.

[0040] Attached Figure 4 A folding optical lens camera module of the present application is illustrated, in which the folding optical lens camera module 100 includes a camera module convex portion A and a camera module shoulder B, wherein the camera module convex portion A is the protruding portion of the folding optical lens camera module 100, equivalent to the portion of the camera module exposed outside the mobile phone cover C, and the camera module shoulder B is the bottom portion of the folding optical lens camera module 100, equivalent to the portion of the folding optical lens camera module 100 accommodated in the mobile phone cover C. In the present application, the camera module shoulder B and the camera module convex portion A of the folding optical lens camera module 100 have different thicknesses respectively to realize various designs. When manufacturing the optical design in the camera module, it is still necessary to ensure the gap between the optical surfaces of the lenses. When manufacturing the lenses, the structural parts will be added by extending the structural surface outside the optical surface of the lenses for molding. In addition, the camera module needs to provide the structural parts of the motor or structural parts to support the optical lens, etc. Therefore, in the present application, the camera module will increase the structure due to avoidance and / or riding, which increases the overall height in the module state. In the present application, the thickness of the convex part of the folded optical lens camera module is ttltm, and the thickness of the shoulder of the camera module is ttljm. The height of the convex part of the camera module and the height of the shoulder of the camera module are designed to satisfy the following relationship: 1.061<ttltm / ttljm<1.514, so that the folded optical lens camera module 100 can have an appropriate structural ratio, thereby reducing the thickness of the terminal.

[0041] It is easier to understand that if the ratio of the camera module shoulder to the camera module convex part is too small, the folding element 20 may be too large, and since the folding element 20 of the present application is made of glass material, it may also cause the folding element 20 to be too heavy and may not be able to effectively reduce the optical size of the folded optical lens 1. In addition, it may also make the lens group 10 too short and too thin and may not be able to achieve good optical performance. Alternatively, if the ratio of the camera module shoulder to the camera module convex part is too large, the folding element 20 may be too thin and may not be able to capture enough light from the entire field of view (FOV), which may cause the reduction of the luminous flux and greatly affect the optical imaging performance. Therefore, in the present application, the optical system of the folded optical lens 1 is designed to have appropriate parameters to reduce at least part of the height and / or the total height of the folded optical lens 1, but still maintain high-quality optical performance. In some embodiments of the present application, the reduction in the height of the total length TTL (Total Track Length) of the optical system mechanism can reduce the size of the optical system accordingly, and is therefore beneficial to the telephoto camera module equipped with the folded optical lens 1 to achieve a compact design.

[0042] In some embodiments, all lenses of lens group 10 may use aspheric lenses. In some embodiments, all lenses of lens group 10 may use spherical lenses. In some embodiments, lens group 10 may include a combination of aspheric lenses and spherical lenses. A spherical lens may refer to a lens having the same curvature in a spherical shape on at least one surface, while an aspheric lens may refer to a lens having a surface whose curvature gradually changes from the center of the lens to the edge. In some embodiments, an aspheric lens can help the folded optical lens 1 achieve a low aperture number. For a given focal length, a lower aperture number means that the optical system can use a larger aperture stop, and a larger aperture stop has a greater light transmission capacity, so that the camera module can receive more light flux per unit time, so that the camera module can have a fast shutter speed.

[0043] Attached Figure 2An exemplary scheme of the mask in the folding element 20 is shown. In some embodiments, providing a mask 40 in the folding element 20 can reduce or mitigate glare. In the present embodiment, the folding element 20 is implemented as a prism. For an optical system, glare may be caused when stray light from the environment (especially stray light that is brighter than the light from the scene or subject to be captured by the camera module) enters the optical system. Stray light from the environment may enter the optical system from various directions of the camera and / or other components (e.g., the side walls of the housing of the camera module), and ultimately enter the image. Stray light may enter the prism, for example, from the surface of the prism (e.g., the top surface of the prism, the bottom surface of the prism). In some embodiments, the prism may include one or more masks 40 located inside the prism and / or at the surface of the prism to reduce glare. In this embodiment, the mask 40 may include a first mask 401 and a second mask 402 located inside the prism, wherein those skilled in the art should know that in some embodiments, the first mask 401 and the second mask 402 may be designed to be in various spatial positions and may have various shapes and / or sizes. As long as the first mask 401 and the second mask 402 can enable the mask 40 to cover the unexpected light path, such as the area illuminated by stray light from the environment, or the light from the unexpected reflection interface in the folding element 20, as long as the first mask 401 and the second mask 402 are arranged successively, the first mask 401 is used to reduce part of the stray light, and the second mask 402 is used to reduce part of the stray light, and the mask itself can intercept and absorb the stray light. The effect of reducing glare can be achieved.

[0044] In this embodiment, the first mask 401 and the second mask 402 can be parallel to each other and disposed on opposite inner sides of the folding element 20, thereby reducing glare caused by stray light from opposite sides of the folding element 20. Those skilled in the art should know that in some other embodiments, the first mask 401 and the second mask 402 can have the same or different shapes. The first mask 401 and the second mask 402 can have different shapes. For example, some frayed edges or serrated patterns can be made near the light-transmitting area of the first mask 401, which can enhance the effect of blocking stray light, and the second mask 402 may not be provided with frayed edges. However, it is worth mentioning that in this application, the first mask 401 and the second mask 402 can be separately provided with structures for enhancing the reduction of stray light. For example, an anti-glare coating, a dark (black) mask, a dark (black) paint, a change in the flange shape, etc. can be provided on the first mask 401 and the second mask 402, all of which can reduce the influence of stray light. Because multiple reflections of light occur inside the folding element 20 of this application, the light is more likely to be deflected or undergo unwanted reflections, which may cause the light to have an unwanted optical path and have a certain regionality, and it is likely to cause the folding optical lens 1 to be affected by stray light.

[0045] In this application, the folding element 20 can adopt an integral prism. In some embodiments, the folding element 20 can also adopt a split prism. For example, several prisms can be joined together with an optically transparent adhesive to form a prism. In some embodiments, an aperture stop can be formed on the split prism by bonding a mask, such as attached Figure 2 As shown, it can be formed by using a rectangular prism and two triangular prisms. The first mask 401 and the second mask 402 can be first formed on corresponding surfaces of the rectangular prism, where the first mask 401 can be formed on two opposite parallel surfaces of the rectangular prism. Then, the rectangular prism can be bonded to the first triangular prism and the second triangular prism so that the first mask 401 and the second mask 402 are formed at the corresponding surfaces, thereby realizing the setting of the aperture stop of the folding element 20 to achieve the effect of reducing stray light.

[0046] In some embodiments, the maximum imaging height of the folding optical lens 1 is ImgH, and the focal length of the folding optical lens 1 is f, satisfying the following relationship: 0.21 < ImgH / f < 0.66, which helps to expand the field of view angle of the folding optical lens 1.

[0047] In combination with the other drawings, it can be seen that in some embodiments, the folding element 20 reflects the incident light three times, wherein the first reflection is the total reflection of the incident light on the second structural surface 22 of the folding element 20. Since the total reflection occurs on the second structural surface 22, the second reflection is the light reflected for the first time passing through the second structural surface 22 and being reflected onto the first structural surface 21, and the third reflection is the light reflected for the second time passing through the first structural surface 21 and being reflected onto the third structural surface 23.

[0048] In some other embodiments, the folding element 20 reflects the incident light five times, wherein the first reflection is the total reflection of the incident light from the second structural surface 22 of the folding element 20 to the first structural surface 21, the second reflection is the total reflection of the first reflected light through the first structural surface 21 to the third structural surface 23, the third reflection is the total reflection of the second reflected light through the third structural surface 23 to the first structural surface 21, the fourth reflection is the total reflection of the third reflected light through the first structural surface 21 to the fourth structural surface 24, and the fifth reflection is the total reflection of the fourth reflected light through the fourth structural surface 24 to the first structural surface 21.

[0049] In some other embodiments, the folding element 20 reflects the incident light seven times, wherein the first reflection is the total reflection of the incident light from the second structural surface 22 of the folding element 20 to the first structural surface 21, the second reflection is the total reflection of the first reflected light through the first structural surface 21 to the third structural surface 23, the third reflection is the total reflection of the second reflected light through the third structural surface 22 to the first structural surface 21, the fourth reflection is the total reflection of the third reflected light through the first structural surface 21 to the third structural surface 23, the fifth reflection is the total reflection of the fourth reflected light through the third structural surface 23 to the first structural surface 21, the sixth reflection is the total reflection of the fifth reflected light through the first structural surface 21 to the fourth structural surface 24, and the seventh reflection is the total reflection of the sixth reflected light through the fourth structural surface 24 to the first structural surface 21.

[0050] It is worth mentioning that in the present application, the folding element 20 is reflected internally an odd number of times, so that the light emitted by the folding element 20 is finally reflected from the fourth structural surface 24 to the first structural surface 21, which makes it easier to set the imaging surface 30 on the upper side of the folding element 20. As described above, by setting the imaging surface 30 on the same side of the folding element 20 and the lens group 10, the overall height of the folded optical lens 1 can be reduced.

[0051] Table 1 below gives the numerical ranges of various conditional formulas of the present application and the actual numerical values ​​of various embodiments:

[0052]

[0053]

[0054] <Example 1>

[0055] Attached Figure 5 The first embodiment of the folded optical lens 1 of the present application is illustrated. In this embodiment, the folded optical lens 1 includes a lens group 10 and a folding element 20 in sequence along the optical path, wherein the lens group 10 includes a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 in sequence from the object side to the image side along the optical path, wherein each lens includes an object side surface close to the object side and an image side surface close to the image side.

[0056] The object side surface (L1S1) of the first lens 11 has a positive curvature radius, and the image side surface (L1S2) of the first lens 11 has a positive curvature radius. The first lens 11 converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0057] The object side surface (L2S1) of the second lens 12 has a negative curvature radius, and the image side surface (L2S2) of the second lens 12 has a negative curvature radius. The second lens 12 can share the required curvature radius and also reduce optical distortion.

[0058] The object side surface (L3S1) of the third lens 13 has a negative curvature radius, and the image side surface (L3S2) of the third lens 13 has a negative curvature radius. The third lens 13 can share the required curvature radius and also reduce optical distortion.

[0059] The object side surface (L4S1) of the fourth lens 14 has a positive curvature radius, and the image side surface (L4S2) of the fourth lens 14 has a positive curvature radius. The fourth lens 14 can share the required curvature radius and also reduce optical distortion.

[0060] In more detail, the object side surface (L1S1) of the first lens 11 is convex, and the image side surface (L1S2) of the first lens 11 is concave, thereby reducing the aperture of the incident light and reducing the size.

[0061] The object side surface (L2S1) of the second lens 12 is a concave surface, and the image side surface (L2S2) of the second lens 12 is a convex surface, which can share the required optical power and reduce optical distortion.

[0062] The object side surface (L3S1) of the third lens 13 is a concave surface, and the image side surface (L3S2) of the third lens 13 is a convex surface, which can share the required optical power and reduce optical distortion.

[0063] The object side surface (L4S1) of the fourth lens 14 is convex, and the image side surface (L4S2) of the fourth lens 14 is concave, which converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0064] The focal length of the first lens 11 is 14.1653 mm, the focal length of the second lens 12 is 14.94 mm, the focal length of the third lens is 498 mm, and the focal length of the fourth lens is -10.67 mm.

[0065] In this embodiment, the first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are all made of plastic materials, thereby reducing the manufacturing cost of the lens assembly 10 .

[0066] In this embodiment, the dimensions of the folded optical lens 1 are shown in Table 1 below, wherein Y represents the spacing between two adjacent surfaces in the Y direction, Z represents the spacing between two surfaces in the Z direction, the angle represents the angle between two planes, and prism S1 represents the aforementioned first structural surface, prism S2 represents the aforementioned second structural surface, prism S3 represents the aforementioned third structural surface, and prism S4 represents the aforementioned fourth structural surface.

[0067]

[0068]

[0069] Table 2 below shows the surface coefficients of various surfaces of this embodiment:

[0070] Table 2 L1S1 L1S2 L2S1 L2S2 L3S1 L3S2 L4S1 L4S2 Radius of curvature 5.1924 14.01 -7.6539 -4.0464 -6.0387 -6.1972 2.962 1.9435 K cone coefficient 0 0 0 -5.7122 1.3026 2.0318 -3.5873 -1.7617 Tier 4 0.0003 0.0024 0.0129 0.064 -0.0093 -0.0097 -0.0023 -0.0089 Tier 6 5.199e-5 0.0007 0.0003 0.0012 0.005 0.0076 -0.0013 -0.0053 Tier 8 -9.484e-6 -0.0001 -0.0005 -0.0012 -0.0008 -0.0019 0.0023 0.0065 Level 10 9.13e-7 -2.305E-5 7.4628E-5 0.0003 4.418E-5 0.0002 -0.0014 -0.0036 Level 12 -1.184e-7 7.213E-6 -1.60E-6 -5.188E-5 7.068E-6 -7.4593E-6 0.0014 0.0012 Level 14 1.324e-8 -7.929E-7 -4.521E-7 -5.079E-6 -1.464E-6 1.689E-6 -7.568E-5 -0.0002 .Level 16 -7.997e-10 4.5477E-8 4.479E-8 3.054.E-7 1.145E-7 2.458E-7 7.773E-6 2.839E-5 Level 18 1.708e-11 -1.365E-9 -1.712E-9 1.016E-8 -4.351E-9 -1.375E-8 -4.362E-7 -1.946E-6 Level 20 0 1.70e-11 2.47e-11 -1.419E-10 6.66E-11 -2.99E-10 1.036E-8 5.747E-8

[0071] In each embodiment of the present application that conforms to the above-mentioned implementation mode, the aspheric curve equation of each lens is expressed as follows:

[0072] X(Y)=(Y 2 / R) / (1+sqrt(1-(1+k)×(Y / R) 2 ))+Σ(A i )×(Y i )

[0073] Where X: the relative distance between the point on the aspheric surface that is Y away from the optical axis and the tangent plane that is tangent to the optical axis of the aspheric surface;

[0074] Y: the vertical distance between the point on the aspheric curve and the optical axis;

[0075] R: radius of curvature;

[0076] k: cone coefficient;

[0077] Ai: i-th order aspheric coefficient;

[0078] Table 3 below shows the optical parameters of each optical element of this embodiment, including refractive index Nd, dispersion coefficient Vd, material, where

[0079] Table 3 L1 L2 L3 L4 Prism Nd 1.536 1.544 1.641 1.67 1.773 Vd 50.69 55.9 22.24 19.4 49.6 Material plastic plastic plastic plastic Glass

[0080] <Example 2>

[0081] Attached Figure 6 A second embodiment of the folded optical lens 1 of the present application is illustrated. In this embodiment, the folded optical lens 1 includes a lens group 10 and a folding element 20 in sequence along the optical path, wherein the lens group 10 includes a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 in sequence from the object side to the image side along the optical path.

[0082] The object side surface (L1S1) of the first lens 11 has a positive curvature radius, and the image side surface (L1S2) of the first lens 11 has a negative curvature radius. The first lens 11 converges light, thereby reducing the aperture of the incident light to reduce the size.

[0083] The object side surface (L2S1) of the second lens 12 has a negative curvature radius, and the image side surface (L2S2) of the second lens 12 has a negative curvature radius. The second lens 12 can share the required curvature radius and also reduce optical distortion.

[0084] The object side surface (L3S1) of the third lens 13 has a negative curvature radius, and the image side surface (L3S2) of the third lens 13 has a negative curvature radius. The third lens 13 can share the required curvature radius and also reduce optical distortion.

[0085] The object side surface (L4S1) of the fourth lens 14 has a positive curvature radius, and the image side surface (L4S2) of the fourth lens 14 has a positive curvature radius. The fourth lens 14 can share the required curvature radius and also reduce optical distortion.

[0086] In more detail, the object side surface (L1S1) of the first lens 11 is convex, and the image side surface (L1S2) of the first lens 11 is concave, thereby reducing the aperture of the incident light and reducing the size.

[0087] The object side surface (L2S1) of the second lens 12 is concave near the optical axis, and the image side surface (L2S2) of the second lens 12 is convex near the optical axis, which can share the required optical power and reduce optical distortion.

[0088] The object side surface (L3S1) of the third lens 13 is a concave surface, and the image side surface (L3S2) of the third lens 13 is a convex surface, which can share the required optical power and reduce optical distortion.

[0089] The object side surface (L4S1) of the fourth lens 14 is convex, and the image side surface (L4S2) of the fourth lens 14 is concave, which converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0090] In this embodiment, the first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are all made of plastic materials, thereby reducing the manufacturing cost of the lens assembly 10 .

[0091] The focal length of the first lens 11 is 10.568 mm, the focal length of the second lens 12 is 25.9418 mm, the focal length of the third lens is 59.23 mm, and the focal length of the fourth lens is -7.33 mm.

[0092] In this embodiment, the dimensions of the folded optical lens 1 are shown in Table 4 below, where Y represents the dimension in the Y direction, Z represents the dimension in the Z direction, and angle represents the angle between two planes:

[0093] Table 4 Y Z angle L1S1 0 0 0 L1S2 0 2.8 0 L2S1 0 2.91 0 L2S2 0 4.18 0 L3S1 0 4.47 0 L3S2 0 5.34 0 L4S1 0 5.37 0 L4S2 0 5.77 0 Prism S1 -2.54 6.98 0 Prism S2 0 8.62 28.6 Prism S3 -7.2 10.54 0 Prism S4 -14.37 8.62 -28.6 IR1 14.37 6.24 0 IR2 -14.37 6.04 0 Image Plane -14.37 5.96 0

[0094] Table 5 below shows the surface coefficients of various surfaces of this embodiment:

[0095] Table 5 L1S1 L1S2 L2S1 L2S2 L3S1 L3S2 L4S1 L4S2 Radius of curvature 6.4396 -97.747 -15.755 -7.673 -21.201 -14.104 3.297 1.8841 K cone coefficient 0 0 0 -3.8594 1.3026 3.3812 -6.232 -2.3828 Tier 4 4.788E-5 -0.0032 -0.002 0.0047 -0.0022 0.0064 -0.0127 -0.0253 Tier 6 4.789E-5 0.0022 0.0026 -0.0003 0.003 -0.0031 0.0046 -0.00134 Tier 8 -9.918E-6 -0.0004 -0.0004 0.0001 -0.0002 0.0007 -0.0016 -0.0051 Level 10 6.697E-7 3.188E-5 4.511E-5 -2.629E-5 7.0412E-5 -7.6144E-5 0.0004 0.0014 Level 12 -2.108E-8 -1.627E-6 -3.015E-6 4.071E-6 -1.1258E-5 4.991E-6 -4.709E-5 -0.0002 Level 14 -1.205E-10 5.171E-8 1.419E-7 -3.783E-7 1.009E-6 -2.705E-7 2.173E-6 2.779E-5 .Level 16 2.005E-11 -9.828E-10 4.751E-9 1.995E-8 -5.2495E-8 1.827E-8 1.454E-7 -2.047E-6 Level 18 -2.803E-13 9.691E-12 1.033E-10 -5.554E-10 1.486E-9 -9.609E-10 -2.062E-8 9.022E-8 Level 20 0 -3.140E-14 -1.081e-12 6.379E-12 -1.781E-11 -2.154E-11 6.629E-10 -1.903E-9

[0096] Table 6 below shows the optical parameters of each optical element of this embodiment, including refractive index Nd, dispersion coefficient Vd, material, where

[0097] Table 6 L1 L2 L3 L4 Prism Nd 1.575 1.544 1.67 1.67 1.883 Vd 37.52 55.9 19.4 19.4 39.2 Material plastic plastic plastic plastic Glass

[0098] <Example 3>

[0099] Attached Figure 7 The third embodiment of the folded optical lens 1 of the present application is illustrated. In this embodiment, the folded optical lens 1 includes a lens group 10 and a folding element 20 in sequence along the optical path, wherein the lens group 10 includes a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 in sequence from the object side to the image side along the optical path.

[0100] The object side surface (L1S1) of the first lens 11 has a positive curvature radius, and the image side surface (L1S2) of the first lens 11 has a positive curvature radius. The object side surface of the first lens 11 can converge light, thereby reducing the aperture of the incident light to reduce the size.

[0101] The object side surface (L2S1) of the second lens 12 has a positive curvature radius, and the image side surface (L2S2) of the second lens 12 has a positive curvature radius. The second lens 12 can share the required curvature radius and also reduce optical distortion.

[0102] The object side surface (L3S1) of the third lens 13 has a positive curvature radius, and the image side surface (L3S2) of the third lens 13 has a positive curvature radius. The third lens 13 can share the required curvature radius and also reduce optical distortion.

[0103] The object side surface (L4S1) of the fourth lens 14 has a positive curvature radius, and the image side surface (L4S2) of the fourth lens 14 has a positive curvature radius. The fourth lens 14 can share the required curvature radius and also reduce optical distortion.

[0104] In more detail, the object side surface (L1S1) of the first lens 11 is convex, and the image side surface (L1S2) of the first lens 11 is concave, thereby reducing the aperture of the incident light and reducing the size.

[0105] The object side surface (L2S1) of the second lens 12 is a convex surface, and the image side surface (L2S2) of the second lens 12 is a concave surface, which can share the required optical power and reduce optical distortion.

[0106] The object side surface (L3S1) of the third lens 13 is convex, and the image side surface (L3S2) of the third lens 13 is concave, which can share the required optical power and reduce optical distortion.

[0107] The object side surface (L4S1) of the fourth lens 14 is convex, and the image side surface (L4S2) of the fourth lens 14 is concave, which converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0108] In this embodiment, the first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are all made of plastic materials, thereby reducing the manufacturing cost of the lens assembly 10 .

[0109] The focal length of the first lens 11 is 22.51 mm, the focal length of the second lens 12 is 16 mm, the focal length of the third lens is -14.72 mm, and the focal length of the fourth lens is -85.15 mm.

[0110] In this embodiment, the dimensions of the folded optical lens 1 are shown in Table 7 below, where Y represents the dimension in the Y direction, Z represents the dimension in the Z direction, and angle represents the angle between two planes:

[0111]

[0112]

[0113] Table 8 below shows the surface coefficients of various surfaces of this embodiment:

[0114] Table 8 L1S1 L1S2 L2S1 L2S2 L3S1 L3S2 L4S1 L4S2 Radius of curvature 8.557 26.4545 4.8673 9.9025 4.9313 3.1392 4.8614 4.1835 K cone coefficient 0 0 0 -90 1.0655 -11.2931 -5.5146 -1.0062 Tier 4 -0.0014 -0.0077 0.0014 0.0268 -0.024 -0.0247 0.0394 0.0227 Tier 6 0.0004 0.0026 -0.0001 -0.0038 0.0157 -0.0069 -0.0138 -0.0101 Tier 8 -2.417E-5 -0.0004 -6.307E-5 -0.0011 -0.0063 0.0023 0.0019 0.0033 Level 10 -2.570E-6 4.036E-5 4.064E-5 0.0006 0.0015 -0.0005 0.0009 -0.0005 Level 12 5.576E-7 -2.244E-6 -1.052E-5 -0.0001 -0.0002 5.687E-6 -0.0006 -7.351E-5 Level 14 -4.277E-8 6.951E-8 1.487E-6 -1.084E-5 2.287E-5 1.645E-5 0.0001 3.875E-5 Level 16 -1.567E-9 -9.199E-10 -1.229E-7 -5.600E-7 -1.403E-6 -2.972E-6 -1.697E-5 -6.191E-6 Level 18 -2.253E-11 0 5.563E-9 1.184E-8 -4.819E-8 2.128E-7 1.097E-6 4.554E-7 Level 20 0 0 -1.060E-10 0 -7.067E-10 -5.627E-9 -2.914E-8 -1.299E-8

[0115] Table 9 below shows the optical parameters of each optical element of this embodiment, including refractive index Nd, dispersion coefficient Vd, material, where

[0116]

[0117]

[0118] <Example 4>

[0119] Attached Figure 8 The fourth embodiment of the folded optical lens 1 of the present application is illustrated. In this embodiment, the folded optical lens 1 includes a lens group 10 and a folding element 20 in sequence along the optical path, wherein the lens group 10 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14 and a fifth lens 15 in sequence from the object side to the image side along the optical path.

[0120] The object side surface (L1S1) of the first lens 11 has a positive curvature radius, and the image side surface (L1S2) of the first lens 11 has a negative curvature radius. The object side surface of the first lens 11 can converge light, thereby reducing the aperture of the incident light to reduce the size.

[0121] The object side surface (L2S1) of the second lens 12 has a positive curvature radius, and the image side surface (L2S2) of the second lens 12 has a positive curvature radius. The second lens 12 can share the required curvature radius and also reduce optical distortion.

[0122] The object side surface (L3S1) of the third lens 13 has a positive curvature radius, and the image side surface (L3S2) of the third lens 13 has a negative curvature radius. The third lens 13 can share the required curvature radius and also reduce optical distortion.

[0123] The object side surface (L4S1) of the fourth lens 14 has a negative curvature radius, the image side surface (L4S2) of the fourth lens 14 has a negative curvature radius, and the fourth lens 11 converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0124] The object side surface (L5S1) of the fifth lens 15 has a positive curvature radius, and the image side surface (L5S2) of the fifth lens 15 has a positive curvature radius. The fifth lens 11 shares the required curvature radius and can also reduce optical distortion.

[0125] In more detail, the object side surface (L1S1) of the first lens 11 is convex, and the image side surface (L1S2) of the first lens 11 is concave, so as to reduce the aperture of the incident light and reduce the size.

[0126] The object side surface (L2S1) of the second lens 12 is a convex surface, and the image side surface (L2S2) of the second lens 12 is a concave surface, which can share the required optical power and reduce optical distortion.

[0127] The object side surface (L3S1) of the third lens 13 is convex, and the image side surface (L3S2) of the third lens 13 is concave, which can share the required optical power and reduce optical distortion.

[0128] The object side surface (L4S1) of the fourth lens 14 is a concave surface, and the image side surface (L4S2) of the fourth lens 14 is a convex surface, which corrects the optical aberration and improves the resolution.

[0129] The object side surface (L5S1) of the fourth lens 15 is convex near the optical axis, and the image side surface (L5S2) of the fifth lens 15 is concave near the optical axis, so as to correct the optical aberration and improve the resolution.

[0130] In this embodiment, the first lens 11 , the second lens 12 , the third lens 13 , the fourth lens 14 and the fifth lens 15 are all made of plastic materials, thereby reducing the manufacturing cost of the lens assembly 10 .

[0131] The focal length of the first lens 11 is 10.69 mm, the focal length of the second lens 12 is -17.81 mm, the focal length of the third lens is 14.31 mm, the focal length of the fourth lens is 45.59 mm, and the focal length of the fifth lens is -11.05 mm.

[0132] In this embodiment, the dimensions of the folded optical lens 1 are shown in Table 10 below, where Y represents the dimension in the Y direction, Z represents the dimension in the Z direction, and angle represents the angle between two planes:

[0133] Table 10 Y Z angle L1S1 0 0 0 L1S2 0 1.19 0 L2S1 0 1.22 0 L2S2 0 1.92 0 L3S1 0 2.62 0 L3S2 0 3.93 0 L4S1 0 4.43 0 L4S2 0 5.06 0 L5S1 0 5.09 0 L5S2 0 5.47 0 Prism S1 -4.12 6.23 0 Prism S2 0 8.68 30.6 Prism S3 -4.12 10.37 0 Prism S4 -8.42 8.68 -30.6 IR1 -8.42 5.68 0 IR2 -8.42 5.47 0 Image Plane -8.42 5.29 0

[0134] The following Tables 11-1 and 11-2 illustrate the surface coefficients of various surfaces of this embodiment:

[0135] Table 11-1 L1S1 L1S2 L2S1 L2S2 L3S1 L3S2 L4S1 L4S2 Radius of curvature 6.478 -76.517 3.855 2.705 9.088 -52.779 -3.516 -3.2938 K cone coefficient -15.235 90 -0.1014 -1.488 -37.503 90 0.153 -0.649 Tier 4 0.0077 0.0061 -0.0035 -0.0028 0.0102 -0.0036 0.0116 -0.026 Tier 6 -0.0016 -0.0019 0.0013 0.0053 0.0019 0.0066 0.0094 -0.0007 Tier 8 0.0005 0.0008 -0.0012 -0.004 -0.0017 -0.0031 -0.0073 -0.0027 Level 10 -0.0001 -0.0002 0.0005 0.0017 0.0005 0.0005 0.003 0.0015 Level 12 -2.848E-5 3.984E-5 -0.0001 -0.0004 -7.021E-5 0.0001 -0.0007 -0.0004 Level 14 -3.602E-6 -4.790E-6 1.764E-5 6.378E-5 5.492E-7 -7.36E-5 0.0001 6.374E-5 .Level 16 2.831E-7 3.652E-7 -1.540E-6 -5.951E-6 9.696E-7 1.412E-5 -8.0461E-6 -5.048E-6 Level 18 1.249E-8 -1.608E-8 7.414E-8 3.107E-7 -1.064E-7 -1.248E-6 3.058E-7 1.4922E-7 Level 20 2.347E-10 -3.103E-10 -1.517E-9 -7.013E-9 3.669E-9 4.25E-8 -3.741E-9 -1.330E-9

[0136] Table 11-2 L5S1 L5S2 Radius of curvature 5.573 2.9543 K cone coefficient -1.595 -0.2165 Tier 4 -0.0534 -0.0781 Tier 6 0.0207 0.0329 Tier 8 -0.0079 -0.0136 Level 10 0.0022 0.0043 Level 12 -0.0003 -0.001 Level 14 1.442E-5 0.0002 .Level 16 4.402E-6 -1.486E-5 Level 18 -7.228E-7 8.318E-7 Level 20 3.391E-8 -2.014E-8

[0137] Table 12 below shows the optical parameters of each optical element of this embodiment, including refractive index Nd, dispersion coefficient Vd, material, where

[0138] Table 12 L1 L2 L3 L4 L5 Prism Nd 1.56 1.67 1.544 1.56 1.60 1.744 Vd 44.75 19.4 56.0 42.52 28.3 44.85 Material plastic plastic plastic plastic plastic Glass

[0139] <Example 5>

[0140] Attached Fig. 9The fifth embodiment of the folded optical lens 1 of the present application is illustrated. In this embodiment, the folded optical lens 1 includes a lens group 10 and a folding element 20 in sequence along the optical path, wherein the lens group 10 includes a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 in sequence from the object side to the image side along the optical path.

[0141] The object side surface (L1S1) of the first lens 11 has a positive curvature radius, and the image side surface (L1S2) of the first lens 11 has a positive curvature radius. The object side surface of the first lens 11 can converge light, thereby reducing the aperture of the incident light to reduce the size.

[0142] The object side surface (L2S1) of the second lens 12 has a negative curvature radius, and the image side surface (L2S2) of the second lens 12 has a negative curvature radius. The second lens 12 can share the required curvature radius and also reduce optical distortion.

[0143] The object side surface (L3S1) of the third lens 13 has a negative curvature radius, and the image side surface (L3S2) of the third lens 13 has a negative curvature radius. The third lens 13 can share the required curvature radius and also reduce optical distortion.

[0144] The object side surface (L4S1) of the fourth lens 14 has a positive curvature radius, the image side surface (L4S2) of the fourth lens 14 has a positive curvature radius, and the first lens 11 converges the light, thereby reducing the aperture of the incident light to reduce the size.

[0145] In more detail, the object side surface (L1S1) of the first lens 11 is convex, and the image side surface (L1S2) of the first lens 11 is concave, so as to reduce the aperture of the incident light and reduce the size.

[0146] The object side surface (L2S1) of the second lens 12 is a concave surface, and the image side surface (L2S2) of the second lens 12 is a convex surface, which can share the required optical power and reduce optical distortion.

[0147] The object side surface (L3S1) of the third lens 13 is a concave surface, and the image side surface (L3S2) of the third lens 13 is a convex surface, which can share the required optical power and reduce optical distortion.

[0148] The object side surface (L4S1) of the fourth lens 14 is convex, and the image side surface (L4S2) of the fourth lens 14 is concave, which corrects optical aberrations and improves resolution.

[0149] In this embodiment, the first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are all made of plastic materials, thereby reducing the manufacturing cost of the lens assembly 10 .

[0150] The focal length of the first lens 11 is 13.78 mm, the focal length of the second lens 12 is 15.84 mm, the focal length of the third lens is 341.85 mm, and the focal length of the fourth lens is -10.44 mm.

[0151] In this embodiment, the dimensions of the folded optical lens 1 are shown in Table 13 below, where Y represents the dimension in the Y direction, Z represents the dimension in the Z direction, and angle represents the angle between two planes:

[0152] Table 13 Y Z angle L1S1 0 0 0 L1S2 0 2.270 0 L2S1 0 2.88 0 L2S2 0 3.623 0 L3S1 0 3.914 0 L3S2 0 4.613 0 L4S1 0 4.664 0 L4S2 0 5.341 0 Prism S1 -5.735 6.32 0 Prism S2 0 8.25 35.7 Prism S3 -5.735 10.65 0 Prism S4 -11.263 8.25 -35.7 IR1 -11.263 5.82 0 IR2 -11.263 5.61 0 Image Plane -11.263 5.60 0

[0153] Table 14 below shows the surface coefficients of various surfaces of this embodiment:

[0154]

[0155]

[0156] Table 15 below shows the optical parameters of each optical element of this embodiment, including refractive index Nd, dispersion coefficient Vd, material, where

[0157] Table 15 L1 L2 L3 L4 Prism Nd 1.533 1.53 1.625 1.67 1.77 Vd 52.4 55.0 24.28 19.48 49.60 Material plastic plastic plastic plastic Glass

[0158] According to the folded optical lenses of the aforementioned multiple embodiments, the present application provides a folded optical lens structure, wherein the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the third lens is concave, the image side surface of the third lens is convex, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is concave, thereby reducing the size of the folded optical lens.

[0159] In addition, according to the folding optical lenses of the aforementioned multiple embodiments, the present application also provides another folding optical lens structure, the lens group also includes a fifth lens, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, the object side surface of the fifth lens is convex at the near optical axis, and the image side surface of the fifth lens is concave at the near optical axis, thereby reducing the size of the folded optical lens.

[0160] Reference Fig.10As shown, in this embodiment, the folded optical lens 1 is manufactured into a folded optical lens camera module 100. In this embodiment, the folded optical lens camera module 100 is a telephoto camera module, and a main camera module 200 is arranged next to the telephoto camera module, wherein the main camera module 200 is generally the one with larger pixels in the mobile phone camera module array. In this application, in order to reduce the overall height of the camera module array, the shoulder height of the main camera module 200 of the present application has a shoulder height similar to that of the telephoto camera module, wherein the shoulder height of the main camera module is ttljz, and the shoulder height of the telephoto camera module is ttljc, satisfying the following relationship: 1≤ttljzm / ttlcm≤1.2,

[0161] Attached Fig.10 The left half of the diagram illustrates a prior art, which is a periscope camera module 100q in which a telephoto camera module is selected as the first optical element and a prism. The folded optical lens of the present application adopts a solution in which the shoulder height structure is a folding element 20, and the shoulder height is mainly the height of the folding element 20. Compared with the lens in the prior art, the shoulder height of the camera module can be within 7 mm. Since the shoulder height of the telephoto camera module is within 7 mm, the shoulder height requirement in the camera module array can be reduced. In the present embodiment, the folding element 20 does not need to be anti-shake or displacement. Therefore, when the folding element 20 is manufactured into a camera module, the shoulder height of the camera module is mainly the height of the folding element 20 superimposed on the height of the structural member at the bottom of the camera module supporting the folding element 20. Generally speaking, the height of the structural member at the bottom of the camera module supporting the folding element 20 is generally 0.3-0.4 mm. The camera module equipped with the folding optical lens 1 of the present application can therefore have a lower shoulder height. Therefore, in the camera module array, a lower height reference can be used. By designing the shoulder height of the main camera module to be as similar as the shoulder height of the camera module equipped with the folding optical lens 1 as possible, the overall shoulder height of the camera module array can be lowered. By lowering the overall shoulder height of the camera module array, the cover plate of the camera module array can have a lower size, so that the camera module array can be set in a mobile phone body, so that the mobile phone body has a lower size.

[0162] In addition, the front lens group 10 of the folded optical lens 1 of the present application can make the exposed appearance a circular lens shape. In the present application, the aperture of the lens in the front lens group 10 does not directly affect the height of the camera module, so the aperture of the lens in the lens group 10 can be increased as much as possible.

[0163] In this embodiment, in the camera module array, the total height of the camera module of the folded optical lens 1 is ttl1, and the total height of other camera modules can be ttlz, which represents the height of the main camera module, and satisfies the following relationship:

[0164] 0.8<ttlz / ttl1<1.2. Within this range, the total height of the main camera module in the camera module array and the camera module of the folded optical lens 1 can be ensured to be as close as possible, thereby ensuring that the heights of each camera module in the camera module array are as consistent as possible, so that each camera module has a surface of the same height as much as possible to achieve uniform visual requirements.

[0165] In the prior art, there are certain requirements for the diameter of the exposed light holes of each camera module of the mobile phone camera module array. Since the exposed rectangular light holes of the periscope camera module in the prior art are inconsistent with the circular light holes, there is no unified aesthetic feeling. In this embodiment, since the exposed external light holes of the camera module of the folded optical lens 1 are circular, in this embodiment, the exposed external light holes of the remaining camera modules in the camera module array are also circular, thus ensuring that the camera module array gives consumers a unified aesthetic feeling. It is worth mentioning that the diameter of the light hole exposed by the camera module of the folded optical lens 1 in this embodiment is Rzd, and the diameter of the light hole exposed by the main camera module is Rzy, which satisfies the following relationship:

[0166] 0.7<Rzy / Rzd<1.5, so that in the camera module array, the diameter of the external light hole exposed by the main camera module is close to the diameter of the external light hole of the camera module of the folded optical lens 1, thereby providing consumers with a more unified visual structural beauty.

[0167] The above describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A folded optical lens, characterized in that: The folded optical lens includes a lens group and a folded element in sequence along the optical path, the lens group includes at least four optical elements, the folded element has at least three reflective surfaces, the at least three reflective surfaces reflect the light a total of an odd number of times, the folded element has a first transmission surface and a second transmission surface, the folded element is configured to transmit the light passing through the lens group into the folded element via the first transmission surface, the three reflection surfaces are a first reflection surface, a second reflection surface and a third reflection surface, the first reflection surface reflects the light transmitted via the first transmission surface, the second reflection surface reflects the light reflected via the first reflection surface, the third reflection surface reflects the light reflected via the second reflection surface, the light reaches the imaging surface via the second transmission surface, the length of the lens group arranged in front of the folded element relative to the imaging surface in the height direction is the convex length, recorded as ttlt, the length of the folded element relative to the imaging surface in the height direction is the shoulder length, recorded as ttlj, and the following conditions are satisfied: 0.768≤ttlt / ttlj≤1.

1.

2. The folded optical lens according to claim 1, characterized in that: The lens group includes at least four plastic lenses, which are respectively a first lens, a second lens, a third lens and a fourth lens. The lens group has an optical axis, wherein the relative distance between the object side surface of the first lens and the image side surface of the fourth lens on the optical axis is L, and satisfies the following relationship: 4.35<L<5.78。 3. The folded optical lens according to claim 2, characterized in that: The focal length of the folded optical lens is f, and the entrance pupil diameter of the folded optical lens is EPD, which satisfies the following relationship: 2.04 <f / EPD<2.97。 4. The folded optical lens according to claim 3, characterized in that: The total length of the optical system of the folded optical lens is TTL, which satisfies the following relationship: 7.3 <TTL<11.5。 5. The folded optical lens according to claim 4, characterized in that: The distance of the folding element in the height direction is the thickness of the folding element, denoted as Lj, which satisfies the following relationship: 2.92 <Lj<3.88。 6. The folded optical lens according to claim 5, characterized in that: The structural surface of the folding element close to the lens group is the first structural surface, the structural surface of the folding element that intersects with the first structural surface at an angle but is far away from the imaging surface is the second structural surface, the structural surface of the folding element that intersects with the second structural surface but is parallel to the first structural surface is the third structural surface, and the structural surface of the folding element that intersects with the first structural surface but is close to the imaging surface is the fourth structural surface, the angle between the first structural surface and the second structural surface is θ1, and the angle between the first structural surface and the fourth structural surface is θ2, satisfying the following relationship: 28.6°<θ1<35.7°, θ1=θ2.

7. The folded optical lens according to claim 6, characterized in that: The length of the folding element relative to the imaging surface in the height direction is the shoulder length, denoted as ttlj, and the total length of the optical system of the folded optical lens is TTL, which satisfies the following relationship: 0.43 <ttlj / TTL<0.53。 8. The folded optical lens according to claim 7, characterized in that: The total length of the optical system of the folded optical lens is TTL, and the height difference between the optical axis of the lens group and the central axis of the imaging surface in the vertical direction is H, which satisfies the following relationship: 0.81 <H / TTL<1.36。 9. The folded optical lens according to claim 8, characterized in that: The total length of the optical system of the folded optical lens is TTL, and the focal length of the folded optical lens is f, which satisfies the following relationship: 0.51 <f / TTL<0.64。 10. The folded optical lens according to claim 9, characterized in that: The maximum imaging height of the imaging surface of the folded optical lens is ImgH, and the focal length of the folded optical lens is f, which satisfies the following relationship: 0.21 <ImgH / f<0.66。 11. The folded optical lens according to claim 2, characterized in that: The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface. The object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

12. The folded optical lens according to claim 2, characterized in that: The lens group further includes a fifth lens, The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface. The object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface. The object side surface of the fifth lens is convex at the near optical axis, and the image side surface of the fifth lens is concave at the near optical axis.

13. A folded optical lens camera module, characterized in that: include: The folded optical lens according to any one of claims 1 to 12, wherein the folded optical lens camera module has a convex portion and a shoulder portion, wherein the height of the convex portion is ttltm, the height of the shoulder portion is ttljm, and the following relationship is satisfied: 1.061<ttltm / ttljm<1.

514.

14. A camera module array, characterized in that: include: A first camera module, wherein the first camera module has a first light hole, and the first light hole is circular; A folded optical lens camera module, the folded optical lens camera module comprising the folded optical lens according to any one of claims 1 to 12, the folded optical lens having a folded optical lens light hole, the folded optical lens light hole being circular, the diameter of the first light hole being R1, the diameter of the folded optical lens light hole being R2, the shoulder height of the first camera module being ttl1m, the shoulder height of the folded optical lens camera module being ttlzm, and satisfying the following relationship: ttl1m≤7.5mm, ttlzm≤7.5mm, 0.7<R2 / R1<1.5.

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