Optical lens, camera module and electronic equipment

Abstract

The invention provides an optical lens, a camera module and an electronic device, the optical lens comprises a first lens group, a first prism and a second lens group which are sequentially arranged from an object side to an image side, the first lens group has positive focal power, the first lens group is a focusing lens group, and the first lens group is used for receiving light emitted into the optical lens; the first prism is used for reflecting the light from the first lens group at least twice; the second lens group has negative focal power, the second lens group is a focusing lens group, and the second lens group is used for receiving the light emitted from the first prism; wherein the optical lens can selectively move at least one lens group in the first lens group and the second lens group so as to realize optical focusing of the optical lens. The first lens group and the second lens group are focusing lens groups, and the optical lens can complete focusing through alternate movement of the two lens groups, so that the focusing stroke of a single lens group can be reduced, the movement precision of the lens groups can be improved, and the focusing precision of the optical lens can be improved.

Description

Technical Field

[0001] This application relates to the field of lens technology, and in particular to an optical lens, a camera module, and an electronic device. Background Technology

[0002] With the continuous development of portable electronic devices such as mobile phones, users have increasingly higher requirements for the size and photography performance of electronic devices. They not only require electronic devices to be thinner and lighter, but also require their camera modules to achieve telephoto photography, and further require the camera modules of electronic devices to achieve functions such as background blur and clear shooting at night.

[0003] The optical lens of the camera module has a fixed lens group and a focusing lens group. The light processed by the lens group can be imaged in the image sensor of the camera module. The focusing lens group moves back and forth along the optical axis to achieve focusing of the optical lens. However, the focusing distance of the focusing lens group is relatively large, and the precision control during its movement is also difficult. This makes it difficult for the optical lens to focus accurately, resulting in low focusing accuracy and making it difficult to guarantee the image quality of the optical lens. Summary of the Invention

[0004] This application provides an optical lens, a camera module, and an electronic device that can shorten the focusing travel of a focusing lens group, thereby solving the problem of low focusing accuracy of optical lenses in the prior art.

[0005] In a first aspect, an optical lens is provided, comprising components arranged sequentially from the object side to the image side:

[0006] The first lens group has positive optical power and is a focusing lens group. The first lens group is used to receive light entering the optical lens.

[0007] A first prism is used to reflect light from the first group of mirrors at least twice.

[0008] The second lens group has negative optical power and is a focusing lens group. The second lens group is used to receive light rays emitted from the first prism.

[0009] The optical lens can selectively move at least one of the first lens group and the second lens group to achieve optical focusing.

[0010] It should be noted that during the focusing process of the optical lens, the first lens group can be moved first, and after it comes to a standstill, the second lens group can be moved, or the second lens group can be moved first, and after it comes to a standstill, the first lens group can be moved. That is, the first and second lens groups will not move simultaneously; when one of them moves, the other remains stationary. This facilitates the calculation of the impact of changes in the position of each lens group on the focusing effect of the optical lens, thereby reducing the design complexity of the optical lens. When one lens group moves to its extreme position and the optical lens is not in sharp focus, the other lens group can take over. The movement continues to change the direction of the light path within the optical lens, allowing the optical lens to continue focusing. Thus, the sum of the focusing travel of the two lens groups is equivalent to the total focusing travel of the optical lens. Conversely, the total focusing travel of the optical lens is divided into several segments, each segment being completed by a corresponding focusing lens group, and each segment's focusing travel is less than the total focusing travel of optical lens 1. This reduces the focusing travel of the first and second lens groups. In some embodiments, the optical lens may also include focusing lens groups other than the first and second lens groups, meaning the number of focusing lens groups within the optical lens is greater than two.

[0011] Of course, during the focusing process of the optical lens, the first lens group and the second lens group can be moved simultaneously. That is, the second lens group is moved synchronously while the first lens group is moved. The positions of the first lens group and the second lens group change at the same time. In this way, the influence of the first lens group and the second lens group on light also changes. This allows the first lens group and the second lens group to cooperate with each other, thereby amplifying the impact of the movement of a single focusing lens group on image sharpness, which is beneficial to shortening the focusing distance of a single focusing lens group.

[0012] The optical lens offers the following advantages: both the first and second lens groups are focusing lens groups, and both can move within the optical lens. For example, the first and second lens groups can be moved separately. The first lens group can be moved first to improve the image sharpness of the optical lens. After the first lens group reaches its limit, the second lens group can be moved, effectively taking over from the first lens group, allowing the optical lens to continue focusing. The optical lens can achieve focusing through the alternating movement of the two lens groups, thus reducing the focusing distance of a single lens group and improving the movement accuracy of the lens group, thereby enhancing the focusing accuracy of the optical lens. Alternatively, the first and second lens groups can move simultaneously within the optical lens. In this case, the relative displacement of the first and second lens groups alters their influence on light, allowing them to cooperate and amplify the impact of a single focusing lens group's movement on image sharpness. This also reduces the focusing distance of a single lens group, simplifies the control of lens group movement, and further improves the movement accuracy of the lens group and the focusing accuracy of the optical lens.

[0013] By setting the first lens group to positive optical power and the second lens group to negative optical power, the first lens group can converge light, making the image of the object clearer. The positive optical power of the first lens group helps to collect and focus light, which on the one hand reduces light scattering and loss, and improves image contrast and resolution. On the other hand, it allows the light entering the optical lens to propagate in a convergent imaging direction, which helps to reduce the space reserved by the optical lens for light propagation and also helps to reduce the size of the second lens group, further reducing the size of the optical lens, which is conducive to the miniaturization and thinning design of electronic devices. In addition, when the first and second lens groups are used together, the effective focal length EFFL of the optical lens is greater than its total optical length TTL. Thus, the telephoto ratio of the optical lens is larger, which can improve the shooting flexibility of the optical lens.

[0014] A first prism is placed between the first and second lens groups, and light undergoes at least two reflections within the first prism, extending the light's propagation path within it. This effectively increases the distance between the first and second lens groups on the optical path, thereby further increasing the lens's telephoto ratio and making distant objects appear clearer in the image, thus improving the lens's image quality. Furthermore, the first lens group, with its positive optical power, converges light, resulting in a higher degree of convergence. This reduces the aperture required for the light to pass through the second lens group, thus decreasing the focusing distance of the second lens group. This simplifies the control of the lens group's movement, improving its accuracy and ultimately enhancing the lens's focusing precision.

[0015] With the above configuration, both the first and second lens groups are focusing lens groups, which reduces the focusing distance of a single lens group. Furthermore, the first lens group has positive optical power, and the first prism reflects light at least twice, further reducing the focusing distance of the second lens group. This reduces the difficulty of controlling the movement of a single lens group, improving the movement accuracy of the lens group and thus the focusing accuracy of the optical lens. The combination of the first and second lens groups, with the first lens group having positive optical power and the second having negative optical power, reduces the size and weight of the optical lens, facilitating miniaturization and thinner design of electronic devices. In addition, the first prism reflecting light at least twice increases the telephoto ratio of the optical lens, allowing it to render distant objects more clearly in the image, thus improving the image quality of the optical lens and consequently the image quality of the electronic device.

[0016] In one possible implementation, when the distance to the target is greater than a preset value, one of the first and second lens groups moves along the optical axis of the lens group to perform optical focusing.

[0017] When the distance to the target is less than or equal to the preset value, the first lens group and the other lens group in the second lens group move along the optical axis of the lens group to perform optical focusing.

[0018] It should be noted that the object distance of the shooting target is greater than the preset value. The object distance of the shooting target can be a fixed value, which is greater than the preset value, or it can be a variable value, which can change within the range from infinity to the preset value. Conversely, the object distance of the shooting target is less than or equal to the preset value. The object distance of the shooting target can be a fixed value, which is less than or equal to the preset value, or it can be a variable value within the range of less than or equal to the preset value. When the shooting target is in a moving state, and the object distance of the shooting target changes from value A to value B, where value A is greater than the preset value and value B is less than the preset value, this change process can be divided into two stages: the first... The first stage is when the object distance of the target decreases from value A to close to the preset value. During this stage, the first lens group (or the second lens group) can be moved to achieve focusing of the optical lens. The second stage is when the object distance of the target decreases from the preset value to value B. During this stage, the second lens group (or the first lens group) can be moved to achieve focusing of the optical lens. When the optical lens is changed from target C to target D, and the object distance (value C) of target C is greater than the preset value, while the object distance (value D) of target D is less than or equal to the preset value, target C and target D can be regarded as a target in a moving state, and the object distance of the target changes from value C to value D.

[0019] For example, when the object distance to the target is greater than a preset value, the first lens group can be moved to achieve optical focusing of the optical lens; when the object distance to the target is less than or equal to the preset value, the second lens group can be moved to achieve optical focusing of the optical lens. Alternatively, when the object distance to the target is greater than the preset value, the second lens group can be moved to achieve optical focusing of the optical lens; when the object distance to the target is less than or equal to the preset value, the first lens group can be moved to achieve optical focusing of the optical lens. For example, the preset value can be 0.4m, 0.5m, 0.6m, or other values. For example, taking a preset value of 0.5m as an example, if the object distance to the target is greater than 0.5m, that is, when the object distance to the target is in the range of infinity to 0.5m, the first lens group (or the second lens group) can be moved to achieve optical focusing of the optical lens; when the object distance to the target is less than or equal to 0.5m, the second lens group (or the first lens group) can be moved to achieve optical focusing of the optical lens.

[0020] When the distance to the target is greater than the preset value, the first lens group (or the second lens group) is moved to achieve focus. Compared with moving the first lens group and the second lens group at the same time, the parameter changes of the optical lens are simpler, which makes it easier to calculate and thus reduces the design difficulty of the optical lens. Correspondingly, when the distance to the target is less than or equal to the preset value, the second lens group (or the first lens group) is moved to achieve focus, which also makes it easier to calculate and thus reduces the design difficulty of the optical lens 1.

[0021] The object distance of the target is compared with a preset value. Based on the comparison result, the first lens group or the second lens group is selected to move. For example, as the object distance of the target gradually decreases from infinity to close to the preset value, the first lens group can be moved continuously to achieve focus. This can improve the focusing speed of the optical lens. In addition, the parameter changes of the optical lens caused by the continuous movement of the first lens group are also continuous, which can facilitate calculation and reduce the design difficulty of the optical lens.

[0022] In some embodiments, a mechanical actuator (such as a focusing motor) (not shown in the figure) can be provided in the camera module. The mechanical actuator is connected to the controller of the electronic device. Two mechanical actuators can be provided, and the two mechanical actuators drive the first lens group and the second lens group to move respectively, so as to realize the automatic focusing of the optical lens.

[0023] In some embodiments, the movement direction and distance of the first and second lens groups can be designed using a pre-calibrated method. For example, before the electronic device leaves the factory, the position information of the first and second lens groups within the optical lens under different object distances is obtained through testing, and the relevant information parameters are recorded in the memory of the corresponding electronic device. When taking pictures with the electronic device, the camera module of the electronic device can measure and obtain the actual object distance information, and then feed the actual object distance information back to the controller of the electronic device. The controller and the memory work together to feed back the movement information of the first and second lens groups to the corresponding mechanical actuators, which drive the first and second lens groups to move, thereby realizing the automatic focusing of the optical lens.

[0024] In some embodiments, when the optical lens is changed from shooting target C to shooting target D, and the object distance (C value) corresponding to shooting target C is greater than a preset value, while the object distance (D value) corresponding to shooting target D is less than a preset value, the controller and memory work together to feed back the movement information of the first lens group and the second lens group to the corresponding mechanical actuators. At this time, the mechanical actuators corresponding to the first lens group can drive the first lens group to move to the limit position, and the mechanical actuators corresponding to the second lens group can drive the second lens group to move to the corresponding position at the same time as the first lens group moves. That is, the two mechanical actuators are activated at the same time, or the second lens group can be driven to move to the corresponding position after the first lens group has stopped, so that the optical lens can focus.

[0025] In one possible implementation, when the object distance of the target being photographed is greater than a preset value and the object distance of the target being photographed gradually decreases, the first lens group moves toward the object side of the optical lens.

[0026] When the object distance of the target being photographed is less than or equal to a preset value, and the object distance of the target being photographed gradually decreases, the second lens group moves toward the image side of the optical lens.

[0027] The first group of lenses, possessing positive optical power, converges the light rays entering the lens. As the light travels from the first group to the second group, the convergence increases. Increasing the distance between the first and second groups effectively lengthens the path of light between them, further enhancing the convergence. It can be understood that when the target is at infinity, the light rays from the target are incident in an approximately parallel manner. As the object distance decreases, the light rays from the target gradually approach a divergent manner, i.e., closer to the object distance. The convergence of light rays at a greater object distance is less than that at a greater object distance. As the object distance gradually decreases, the light rays entering the optical lens gradually diverge. Moving the first lens group toward the object side of the optical lens is equivalent to increasing the distance between the first and second lens groups, thus lengthening the optical path between them, allowing the light rays to converge on the imaging plane. Similarly, moving the second lens group toward the image side of the optical lens is also equivalent to increasing the distance between the first and second lens groups, lengthening the optical path between them, and allowing the light rays to converge on the imaging plane.

[0028] In one possible implementation, the movement direction of the first lens group is parallel to the light incident direction of the optical lens, and the movement direction of the second lens group is tilted relative to the light incident direction of the optical lens.

[0029] The first lens group is positioned at the light-incident position of the optical lens. Moving the first lens group parallel to the light-incident direction of the optical lens allows the empty space at the light-incident position of the optical lens to provide the necessary space for its movement. This reduces the extra space the optical lens needs to reserve for focusing the first lens group, thus reducing its overall size. The second lens group is tilted relative to both the light-incident direction of the optical lens and the thickness direction of the electronic device. This reduces the component of the second lens group's movement in the thickness direction of the electronic device, thereby reducing the size of the optical lens in that direction and facilitating a thinner and lighter design for the electronic device.

[0030] In one possible implementation, the focal length of the optical lens is M1 when shooting at a distance, and M2 when shooting at close range. The optical lens satisfies the following relationship:

[0031] 0.8≤M1 / M2≤1.2.

[0032] By controlling the ratio of the focal length M1 when the optical lens is in telephoto shooting mode to the focal length M2 when it is in close-up shooting mode between 0.8 and 1.2, the focal length of the optical lens changes little between telephoto and close-up shooting. This results in a shorter focusing throw, which can reduce the size of the optical lens. In addition, it can also improve the focusing speed of the optical lens. For example, when the optical lens is used to shoot fast-moving objects or in scenes that require fast focusing, the optical lens can complete focusing more quickly, thereby capturing a clear image. Furthermore, the small change in focal length between telephoto and close-up shooting allows for imaging optimization for a single focal length, thereby reducing optical defects such as aberrations and distortions, enabling electronic devices to capture clear and detailed images.

[0033] Optical lenses have a smaller change in focal length when shooting at long distances and close distances, and are equivalent to fixed-focus lenses.

[0034] For example, the ratio of the focal length M1 of the optical lens in the long-distance shooting state to the focal length M2 in the short-distance shooting state can be 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, or 1.2. In some embodiments, 0.9 ≤ M1 / M2 ≤ 1.1, and the ratio of the focal length M1 of the optical lens in the long-distance shooting state to the focal length M2 in the short-distance shooting state can be 0.9, 0.92, 0.94, 0.96, 0.98, 1, 1.02, 1.04, 1.06, 1.08, or 1.1.

[0035] In one possible implementation, the optical lens further includes a second prism located on the image side of the second lens group, the second prism being used to reflect light from the second lens group.

[0036] The second prism can reflect light from the second group of mirrors, thereby changing the direction of light propagation. This allows the orientation of the image sensor to be adjusted.

[0037] In one possible implementation, the light exit direction of the second prism is parallel to the light entrance direction of the optical lens.

[0038] The light-emitting direction of the second prism is parallel to the light-incident direction of the optical lens. In this way, the surface of the image sensor used to receive light (which is usually the surface with the largest area of ​​the image sensor) can be set parallel to the width and length directions of the electronic device. That is, the surface of the image sensor used to receive light can be perpendicular to the thickness direction of the electronic device. This can reduce the space occupied by the image sensor in the thickness direction of the electronic device, which is beneficial to reducing the thickness of the electronic device.

[0039] In one possible implementation, the light exit direction of the second prism is opposite to the light entrance direction of the optical lens.

[0040] The light exit direction of the second prism is opposite to the light entrance direction of the optical lens. Therefore, the first lens group and the image sensor can be set on the same side of the optical lens, so that the image sensor can be installed in the empty area around the optical lens.

[0041] In one possible implementation, the optical lens further includes a folding element located between the first prism and the second prism along the optical axis of the optical lens, and the folding element is located on the object side or image side of the second lens group. The folding element includes a reflecting surface for reflecting light to the second prism.

[0042] By incorporating a folding element into an optical lens, the reflective surface of the folding element can reflect light, thereby changing the direction of light propagation. This facilitates the design of the positions of various components within the optical lens, improves the utilization of space within the optical lens, and ultimately helps to reduce the size of the optical lens.

[0043] In some embodiments, the folding element can be a prism. In this case, the folding element also includes an incident surface and an exit surface. Light enters the folding element from the incident surface, is reflected by the reflecting surface, and exits the folding element from the exit surface. In other embodiments, the folding element can also be a mirror. In this case, light is reflected by the reflecting surface of the mirror.

[0044] In some embodiments, the second lens group can be located on the object side of the folding element. That is, the light emitted from the first prism undergoes optical processing by the second lens group before being reflected by the folding element. This reduces the distance between the first and second lens groups. It is understood that during the propagation of light after exiting the first lens group and before entering the second lens group, the deviation of the light from the optical axis caused by the first lens group gradually increases. Shortening the distance between the first and second lens groups shortens the path of the light between them, thus reducing the deviation of the light from the optical axis after exiting the first lens group and before entering the second lens group. This reduces the difficulty of correcting aberrations caused by the first lens group by the second lens group, reduces aberrations in the final image, and improves the imaging quality of the camera module. In other embodiments, the second lens group can be located on the image side of the folding element. That is, the light is reflected by the folding element and then enters the second lens group for optical processing. This increases the distance between the first and second lens groups, further improving the telephoto ratio of the optical lens and thus enhancing the flexibility of electronic device shooting.

[0045] In one possible implementation, the folding element is connected to the first prism; or, the folding element is connected to the second prism. Thus, the folding element and the first or second prism can form a single unit, reducing the number of components within the optical lens and facilitating the assembly of the optical lens.

[0046] In one possible implementation, the second prism includes a first side surface, a second side surface, and a third side surface, with a first angle between the second side surface and the third side surface, the first angle being less than 45°. Light rays entering the second prism from the first side surface are reflected sequentially by the third side surface and the second side surface and exit from the third side surface.

[0047] Setting the angle of the first included angle formed between the second and third sides of the second prism to less than 45° helps to reduce the size of the optical lens in the thickness direction of the electronic device 1000, thereby helping to reduce the size of the camera module in the thickness direction of the electronic device, which is beneficial to reducing the thickness of the electronic device 1000.

[0048] The first included angle α formed between the second and third sides is less than 45° (e.g., α is 25°). For example, the range of α can be: 0° < α < 10°, 10° ≤ α < 20°, 20° ≤ α < 25°, 25° ≤ α < 30°, 30° ≤ α < 35°, 35° ≤ α < 40°, 40° ≤ α < 45°. For example, the range of α can be: 22° < α < 28°.

[0049] In the above embodiments, the second prism is a non-45° prism. In other embodiments, the second prism can also be other types of prisms to achieve at least two reflections of light. For example, a Schmidt-Pechan prism, an Abbe-Koenig prism, or a Porro prism can be selected.

[0050] In one possible implementation, the first included angle α and the refractive index n1 of the second prism satisfy: n1≥1 / sin(2α). This allows the third side to achieve total internal reflection, reducing light loss in the second prism.

[0051] In one possible implementation, the first prism includes a fourth side, a fifth side, and a sixth side, with a second angle between the fourth side and the fifth side, the second angle being less than 45°. Light rays entering the first prism from the fourth side are reflected sequentially by the fifth side and the fourth side and exit from the sixth side.

[0052] Setting the angle of the second included angle formed between the fourth and fifth sides of the first prism to less than 45° helps to reduce the size of the optical lens in the X-axis direction (i.e., the thickness direction of the electronic device) as shown in the figure, thereby helping to reduce the size of the camera module in the thickness direction of the electronic device, which is beneficial to reducing the thickness of the electronic device.

[0053] The second included angle β formed between the fourth and fifth sides is less than 45° (e.g., β is 25°). For example, the range of β can be: 0° < β < 10°, 10° ≤ β < 20°, 20° ≤ β < 25°, 25° ≤ β < 30°, 30° ≤ β < 35°, 35° ≤ β < 40°, 40° ≤ β < 45°. For example, the range of β can be: 22° < β < 28°.

[0054] In one possible implementation, the second included angle β satisfies the following condition with respect to the refractive index n2 of the first prism: n2 ≥ 1 / sin(2β). Thus, the fourth side surface 21 can achieve total internal reflection, reducing light loss in the first prism 20.

[0055] In some embodiments, both the first prism and the second prism can be non-45° prisms.

[0056] In some embodiments, the first included angle α and the second included angle β are equal in size, so that the surface of the image sensor used to receive light can be perpendicular to the thickness direction of the electronic device, reducing the space occupied by the image sensor in the thickness direction of the electronic device, which is beneficial to reducing the thickness of the electronic device.

[0057] For example, the ranges of α and β can be: 0°<α=β<10°, 10°≤α=β<20°, 20°≤α=β<25°, 25°≤α=β<30°, 30°≤α=β<35°, 35°≤α=β<40°, and 40°≤α=β<45°.

[0058] For example, the ranges of α and β can be: 22° < α = β < 28°.

[0059] In one possible implementation, the optical lens further includes a third lens group having negative optical power, the third lens group being located on the image side of the first prism and on the object side or image side of the second lens group.

[0060] In some embodiments, the third mirror group may be located on the image side of the second mirror group, that is, the second mirror group is located between the first mirror group and the third mirror group. In other embodiments, the third mirror group may be located on the object side of the second mirror group, that is, the third mirror group is located between the first mirror group and the second mirror group.

[0061] Adding a third lens group with negative optical power within the optical lens can further increase the telephoto ratio of the optical lens, thereby improving the shooting flexibility of the optical lens; in addition, the third lens group can also correct aberrations, thereby improving the image quality of the optical lens.

[0062] In one possible implementation, the combined focal length of the first lens group is F1, the combined focal length of the optical lens is M, and the optical lens (1) satisfies the following relationship:

[0063] 0.5≤F1 / M≤1.5.

[0064] It should be noted that the overall focal length of the first lens group can be understood as the equivalent focal length exhibited when all the lenses in the first lens group are used together. For example, when the first lens group has only one lens, the overall focal length of the first lens group is the focal length of that single lens. When the first lens group includes a first lens and a second lens, the overall focal length of the first lens group can be understood as the equivalent focal length exhibited when the first lens and the second lens are used together. The refraction effect of light after passing through the first lens and the second lens can be equivalent to that of a single lens with a specific focal length. The focal length of this equivalent lens is the overall focal length of the first lens group formed by the combination of the first lens and the second lens. Accordingly, The overall focal length of an optical lens can be understood as the equivalent focal length exhibited when all the lenses within the optical lens are used together. For example, an optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. In this case, the overall focal length of the optical lens can be understood as the equivalent focal length exhibited when the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are used together. When shooting at a distance, the focal length of the optical lens is M1, and when shooting at close range, the focal length of the optical lens is M2. The overall focal length M of optical lens 1 can vary between M1 and M2.

[0065] It should be noted that the focal length of an optical lens can be the focal length of the lens with respect to a specific wavelength of light. This is understandable, as the same material has different refractive power for different wavelengths of light; this principle produces phenomena commonly seen in daily life. For example, sunlight passing through a prism is broken down into seven colors, creating a rainbow. Similarly, M1 and M2 of an optical lens can be the focal lengths of the lens with respect to white light, where the wavelength can range from 400nm to 760nm.

[0066] Understandably, for a lens with positive optical power, the smaller its focal length, the stronger its ability to converge light. The stronger the lens's ability to converge light, the greater the deflection of the light after passing through the lens, and the greater the aberrations caused by the lens. In other words, the lens has a greater impact on the final image quality. Setting the ratio of the combined focal length of the first lens group (F1) to the combined focal length of the optical lens (M) to be no less than 0.5 can control the light-converging ability of the first lens group, thereby reducing the aberrations caused by the first lens group. Furthermore, setting the ratio of the combined focal length of the first lens group (F1) to the combined focal length of the optical lens (M) to be no greater than 1.5 can ensure the light-converging ability of the first lens group, so that the optical path can be adjusted during the movement of the first lens group, achieving focusing of the optical lens and ensuring the image quality of the optical lens.

[0067] For example, the ratio of the composite focal length of the first lens group to the composite focal length of the optical lens to M can be set to 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5.

[0068] In one possible implementation, the combined focal length of the second lens group is F2, and the optical lenses satisfy the following relationship:

[0069] |F2 / M|≥1.1.

[0070] It should be noted that the combined focal length of the second lens group can be understood as the equivalent focal length exhibited when all the lenses in the second lens group are used together. For example, the second lens group can include a third lens, a fourth lens, and a fifth lens. In this case, the combined focal length of the second lens group can be understood as the equivalent focal length exhibited when the third lens, the fourth lens, and the fifth lens are used together. The refraction effect of light after passing through the third lens, the fourth lens, and the fifth lens can be equivalent to a single lens with a specific focal length. The focal length of this equivalent lens is the combined focal length of the second lens group formed by the combination of the third lens, the fourth lens, and the fifth lens.

[0071] It should be noted that the second lens group has negative optical power, and its overall focal length is negative, while the overall focal length of the optical lens is positive. Therefore, the ratio between the two can be expressed as an absolute value.

[0072] It is understandable that for a lens with negative optical power, the smaller the absolute value of its focal length, the stronger its ability to diverge light. The stronger the lens's ability to diverge light, the greater the deflection of the light's propagation direction after passing through the lens, and the greater the aberrations caused by the lens. In other words, the lens has a greater impact on the final image quality. Setting the ratio of the combined focal length of the second lens group (F2) to the combined focal length of the optical lens (M) to be no less than 1.1 can control the light-gathering ability of the second lens group, thereby reducing the aberrations caused by the second lens group. In addition, it can also ensure the light-gathering ability of the second lens group, so that the optical path can be adjusted during the movement of the second lens group, realizing the focusing of the optical lens and ensuring the image quality of the optical lens.

[0073] It should be noted that the overall focal length F1 of the first lens group can be the focal length of the first lens group with respect to a certain wavelength of light; for example, the overall focal length F1 of the first lens group can be the focal length of the first lens group with respect to white light, and the wavelength of white light can be 400nm to 760nm.

[0074] The overall focal length M of an optical lens can be the focal length of the optical lens with respect to a certain wavelength of light; for example, the overall focal length M of an optical lens can be the focal length of the optical lens with respect to white light, the wavelength of which can be 400nm to 760nm.

[0075] For example, the ratio of the combined focal length of the second lens group to the combined focal length of the optical lens to M can be set to 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2.0, or 2.5.

[0076] The combined focal length F2 of the second lens group can be the focal length of the second lens group with respect to a certain wavelength of light; for example, the combined focal length F2 of the second lens group can be the focal length of the second lens group with respect to white light, and the wavelength of white light can be 400nm to 760nm.

[0077] In one possible implementation, either the first lens group or the second lens group has a first focal length F11 with respect to light of wavelength λ1, either the first lens group or the second lens group has a second focal length F12 with respect to light of wavelength λ2, and either the first lens group or the second lens group has a third focal length F13 with respect to light of wavelength λ3, wherein λ1 is 650 nm, λ2 is 550 nm, and λ3 is 435 nm, and the optical lens satisfies the following relationship:

[0078] 0.99≤F11 / F12≤1.01;

[0079] 0.99≤F13 / F12≤1.01.

[0080] It should be noted that the first lens group has positive optical power, and its focal length is a positive value. The second lens group has negative optical power, and its focal length is a negative value. If the focal length of the first lens group is compared with that of the second lens group, the resulting ratio is negative. This negative value does not satisfy the above relationship. In other words, the above relationship does not include any limitation on the relationship between the focal lengths of the first and second lens groups; a comparison between the focal lengths of the first and second lens groups is not necessary. In the above relationship, F11 / F12 represents the ratio of the first focal length to the second focal length of the first lens group (or the ratio of the first focal length to the second focal length of the second lens group), and F13 / F12 represents the ratio of the third focal length to the second focal length of the first lens group (or the ratio of the third focal length to the second focal length of the second lens group).

[0081] It is understandable that the same material has different refractive power for different wavelengths of light. This principle produces phenomena commonly seen in daily life. For example, sunlight passing through a prism is broken down into seven colors, creating a rainbow. For optical lenses, this phenomenon can easily cause chromatic aberration in the image. By controlling the ratio of the first focal length to the second focal length of the first lens group to be between 0.99 and 1.01, and by controlling the ratio of the third focal length to the second focal length of the first lens group to be between 0.99 and 1.01, the refractive power of the first lens group for different wavelengths of light can be controlled within a suitable range. This reduces the chromatic aberration produced by the first lens group. This ensures that the chromatic aberration produced by the optical lenses is minimal when the first lens group moves to focus, thus guaranteeing the image quality of the optical lenses during this process. Furthermore, by controlling the ratio of the first focal length to the second focal length of the second lens group to be between 0.99 and 1.01, and by controlling the ratio of the third focal length to the second focal length of the second lens group to be between 0.99 and 1.01, the refractive power of the second lens group for different wavelengths of light can be controlled within a suitable range. This reduces the chromatic aberration produced by the second lens group, resulting in minimal chromatic aberration changes during focusing and thus ensuring the image quality of the optical lenses during this process.

[0082] For example, the ratio of the first focal length of the first lens group to the second focal length of the first lens group can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0083] For example, the ratio of the third focal length of the first lens group to the second focal length of the first lens group can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0084] For example, the ratio of the first focal length of the second lens group to the second focal length of the second lens group can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0085] For example, the ratio of the third focal length of the second lens group to the second focal length of the second lens group can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0086] It should be noted that the ratios of the first focal length to the second focal length of the first lens group, the ratio of the third focal length to the second focal length of the first lens group, the ratio of the first focal length to the second focal length of the second lens group, and the ratio of the third focal length to the second focal length of the second lens group can be equal or unequal. Alternatively, two of them can be equal while the other two are unequal, or three of them can be equal while the remaining one is unequal to the other three.

[0087] The value of λ1 can be in the range of 640nm to 660nm. For example, the value of λ1 can be 640nm, 642nm, 644nm, 646nm, 648nm, 650nm, 652nm, 654nm, 656nm, 658nm and 660nm.

[0088] The value of λ2 can be in the range of 540nm to 560nm. For example, the value of λ2 can be 540nm, 542nm, 544nm, 546nm, 548nm, 550nm, 552nm, 554nm, 556nm, 558nm and 560nm.

[0089] The value of λ3 can be in the range of 425nm to 445nm. For example, the values ​​of λ3 can be 425nm, 427nm, 429nm, 431nm, 433nm, 435nm, 437nm, 439nm, 441nm, 443nm and 445nm.

[0090] Secondly, a camera module is provided, including an image sensor and the aforementioned optical lens, wherein the optical lens is used to image a scene on the object side onto the image sensor.

[0091] Because the overall size of the aforementioned optical lens is small, the camera module containing this optical lens is also small, occupying less space within the electronic device, which is beneficial for miniaturizing and thinning the electronic device. In addition, the aforementioned optical lens has high focusing accuracy, which can make distant objects appear clearer in the image, thus improving the imaging quality of the camera module and consequently improving the imaging quality of the electronic device.

[0092] Thirdly, an electronic device is provided, including an image processor and the aforementioned camera module, wherein the camera module is used to acquire image data and input the image data into the image processor, and the image processor is used to process the image data.

[0093] Because the aforementioned camera module is small in size, it occupies little space within electronic devices, thus enabling the reduction of the size of electronic devices and achieving miniaturization and thinning. In addition, the aforementioned camera module has high imaging quality, therefore electronic devices containing this camera module have high imaging quality.

[0094] In this embodiment, when using an electronic device to take pictures, when the object distance to the target occurs, the first and second lens groups can be moved to achieve focusing of the optical lens. The first and second lens groups can move alternately or simultaneously. Setting up two focusing lens groups can reduce the focusing distance of a single lens group, which is beneficial to improving the movement accuracy of the lens group and the focusing accuracy of the optical lens, enabling the electronic device to capture clear images. The first lens group with positive optical power and the second lens group with negative optical power are used together, and the light passes through the first lens group first and then the second lens group. This can reduce the size and weight of the optical lens and increase the telephoto ratio of the optical lens, which is beneficial to the miniaturization and thinning design of the electronic device, thereby improving the flexibility and image quality of the electronic device in shooting. In addition, the light is reflected at least twice in the first prism, which is equivalent to increasing the distance between the first and second lens groups in the optical path. This can further increase the telephoto ratio of the optical lens, further improving the flexibility and image quality of the electronic device in shooting. Attached Figure Description

[0095] Figure 1 This is a schematic diagram of the optical lens and image sensor structure in related technologies. Figure 1 .

[0096] Figure 2 This is a schematic diagram of the optical lens and image sensor structure in related technologies. Figure 2 .

[0097] Figure 3 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0098] Figure 4 This is a schematic diagram of the structure of an optical lens and an image sensor provided in one embodiment of this application.

[0099] Figure 5 This is a schematic diagram showing the positional changes of the first and second lens groups during the focusing process of the optical lens provided in this application embodiment.

[0100] Figure 6 This is a schematic diagram of the optical system provided in the embodiments of this application.

[0101] Figure 7 yes Figure 4 The diagram shows the modulation transfer function of the optical lens at an infinity object distance.

[0102] Figure 8yes Figure 4 The modulation transfer function of the optical lens at an object distance of 0.5m is shown in the figure.

[0103] Figure 9 yes Figure 4 The modulation transfer function of the optical lens at an object distance of 0.27m is shown in the figure.

[0104] Figure 10 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0105] Figure 11 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0106] Figure 12 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0107] Figure 13 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0108] Figure 14 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0109] Figure 15 This is a schematic diagram of the structure of an optical lens and an image sensor provided in another embodiment of this application.

[0110] Figure label:

[0111] 1' Prism; 2' Fixed lens group; 21' First lens; 3' Image sensor; 4' Focusing lens group; 41' Second lens;

[0112] 1000. Electronic devices;

[0113] 100. Housing; 1001. Frame; 1002. Back cover; 1003. Lens protection lens; 200. Display screen; 300. Camera module;

[0114] 1. Optical lens;

[0115] 10. First mirror group; 11. First lens; 12. Second lens; 20. First prism; 21. Fourth side surface; 22. Fifth side surface; 23. Sixth side surface; 30. Second mirror group; 31. Third lens; 32. Fourth lens; 33. Fifth lens; 40. Folding element; 41. Reflecting surface; 50. Third mirror group; 51. Sixth lens; 52. Seventh lens; 60. Second prism; 61. First side surface; 62. Second side surface; 63. Third side surface; 70. Aperture stop;

[0116] 2. Image sensor;

[0117] 3. Filter. Detailed Implementation

[0118] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0119] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0120] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc., indicate the orientation or positional relationship based on the installation orientation or positional relationship, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0121] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0122] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0123] For ease of understanding, the technical terms used in this application will be explained and described below.

[0124] Lens: A component that uses the refraction principle of a lens to allow light from a scene to pass through the lens and form a clear image on the focal plane.

[0125] A lens group is a combination of one or more lenses. The entire lens group can move, or at least one lens in the lens group can move. In the embodiments of this application, a lens group can also be understood as a lens assembly or a lens group.

[0126] Optical axis (OA): This is an axis that passes perpendicularly through a lens. The lens optical axis is the axis that passes perpendicularly through the centers of all the lenses within the lens. Depending on the arrangement of the lenses within the lens, the optical axis can be a straight line (i.e., the centers of all lenses lie on the same straight line), or it can be a broken line with one or more bends (i.e., at least some of the lens centers are not collinear). When light rays parallel to the optical axis enter a convex lens, an ideal convex lens should converge all the light rays to a single point behind the lens; this point where all the light rays converge is called the focal point.

[0127] Object side and image side: With the lens as the boundary, the side where the object is located is called the object side, and the surface of the lens closest to the object side can be called the object side surface; with the lens as the boundary, the side where the image of the object is located is called the image side, and the surface of the lens closest to the image side can be called the image side surface.

[0128] Focal length, also known as focal length, 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 lens group to the focal point when a distant object is projected into a sharp image on the focal plane. It can also be understood as the perpendicular distance from the optical center of the lens or 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 image plane. For fixed-focus lenses, the position of their optical center remains constant; for camera modules, changes in the lens's optical center result in changes in the lens's focal length.

[0129] Effective focal length (EFFL): The distance from the principal plane of an optical system to the corresponding focal point.

[0130] Equivalent focal length: The equivalent focal length is the focal length of an optical lens that corresponds to the same imaging angle on a 135 camera module, converted from the viewing angle of images on different sized image sensors. In other words, the 135 camera module serves as a standard, converting the focal length of non-135 camera modules to the equivalent focal length of a 135 camera module. Equivalent focal length = Effective focal length of the optical lens * Focal length factor (or focal length multiplier), where the focal length factor is the ratio of the diagonal length of the sensor in a non-135 camera module to the diagonal length of the image sensor in a 135 camera module. Therefore, equivalent focal length = Effective focal length of the optical lens * Diagonal length of the image sensor in a 135 camera module / Total image height. For example, if the effective focal length of the optical lens is 14.8mm, the full image height is 7.0mm, and the diagonal length of the image sensor in the 135 format camera module is 43.27mm, then the equivalent focal length of the optical lens is approximately 14.8 * 43.27 / 7.0 ≈ 91.5mm.

[0131] Focal power is equal to the difference between the image-side convergence and the object-side convergence, characterizing the ability of an optical system to deflect light. It is commonly represented by the letter φ. For a refracting spherical surface, φ = (n' - n) / r = n' / f' = -n / f, where n' is the image-side refractive index, n is the object-side refractive index, r is the radius of the spherical surface, f' is the image focal length, and f is the object focal length. Generally, focal power is expressed as the reciprocal of the image-side focal length (approximately assuming the refractive index of air is 1). This equation for focal power is universally applicable to any optical system (regardless of paraxiality).

[0132] Optical power characterizes the ability of an optical system to refract incident parallel light rays. The larger the value of φ, the more pronounced the refraction of parallel light rays; when φ>0, the refraction is converging; when φ<0, the refraction is diverging. When φ=0, corresponding to φ, it is plane refraction. In this case, parallel light rays along the axis remain parallel light rays along the axis after refraction, and no refraction occurs.

[0133] Autofocus (AF): Autofocus utilizes the principle of light reflection from the subject. The reflected light passes through the lens and is imaged and received on the image sensor. The computer then processes the image to determine the subject's distance and automatically moves the lens accordingly to achieve focus. The purpose of autofocus is to ensure that objects at different distances are clearly imaged on the image sensor. The camera module typically uses a voice coil motor (VCM) or similar power mechanism to control the forward and backward movement of the optical lens along the optical axis, thereby adjusting the distance between the lens and the image sensor to achieve autofocus.

[0134] Distortion, also known as image distortion, refers to the degree of distortion in the image formed by an optical system relative to the object itself. Distortion occurs due to the spherical aberration of the aperture. The height of the intersection point between the principal ray from different fields of view and the Gaussian image plane is not equal to the ideal image height; this difference is the distortion. Therefore, distortion only changes the imaging position of an off-axis object point on the ideal plane, causing a distortion in the image shape, but it does not affect the image's sharpness.

[0135] Total track length (TTL): refers to the total length from the head of the lens barrel to the imaging plane, and is the main factor that determines the height of the camera.

[0136] Freeform surfaces: In optics, surfaces without a rotational axis of symmetry are generally referred to as freeform surfaces.

[0137] Aberration: The paraxial region of an optical system has the properties of an ideal optical system, where paraxial rays emitted from a point on an object intersect the image plane at a single point.

[0138] In reality, light rays passing through different apertures of a lens rarely intersect perfectly at a single point. Instead, they deviate from the position of the paraxial image point. These differences are collectively referred to as aberrations.

[0139] Image height (IMH): This refers to half the diagonal length of the effective pixel area on the image sensor.

[0140] Field of view (FOV): In optical instruments, the field of view is the angle between the two edges of the lens, representing the maximum range through which the image of the object can pass through the lens. The size of the FOV determines the field of view of the optical instrument; a larger FOV results in a wider field of view but a smaller optical magnification. A shorter focal length results in a wider horizontal field of view, and consequently, a smaller image. The horizontal field of view narrows as the focal length increases, while the object being photographed increases in size.

[0141] Aperture stop (STO): It is an aperture stop that limits the maximum tilt angle of the edge rays in the imaging rays of an on-axis point, that is, the aperture stop with the smallest incident aperture angle.

[0142] Aperture: Aperture refers to the effective diameter through which light passes by an optical element (such as a lens or aperture). For a lens, aperture usually refers to the diameter of the largest circular area through which light can pass. The size of the aperture directly affects the amount of light passing through the optical system. For example, in a camera lens, a larger aperture allows more light to enter the camera, resulting in brighter and clearer images in low-light conditions and reduced noise. However, a large aperture may also lead to a shallower depth of field, where only a smaller area of ​​objects can be clearly imaged. Similarly, in a telescope, a larger aperture collects more light, resulting in brighter and clearer observations of celestial objects and the ability to resolve more details.

[0143] Telephoto ratio: In an optical system, the telephoto ratio is equal to the ratio of the total optical length (TTL) to the effective focal length (EFFL).

[0144] With the continuous development of portable electronic devices such as mobile phones, users have increasingly higher requirements for the size and photography performance of electronic devices. They not only require electronic devices to be thinner and lighter, but also require their camera modules to achieve telephoto photography, and further require the camera modules of electronic devices to achieve functions such as background blur and clear shooting at night.

[0145] Figure 1 Schematic diagram of optical lens and image sensor structure in related technologies Figure 1 , Figure 2 Schematic diagram of optical lens and image sensor structure in related technologies Figure 2 ;reference Figure 1 and Figure 2 The optical lens shown in the figure can be applied to electronic devices. The following example illustrates the application of an optical lens and image sensor in a mobile phone: Figure 1 The optical lens shown includes a prism 1', a fixed lens group 2', and a focusing lens group 4' arranged sequentially from the object side to the image side. The X' direction shown in the figure is the thickness direction of the mobile phone, and the Y' axis direction shown in the figure is the length direction of the mobile phone. The prism 1' can reflect light incident in the X' axis direction, causing it to deflect by 90° so that it propagates along the Y' axis direction. The fixed lens group 2' and the focusing lens group 4' are arranged along the Y' axis direction. The fixed lens group 2' includes several first lenses 21', and the focusing lens group 4' includes several second lenses 41'. Both the first lenses 21' and the second lenses 41' can perform optical processing on the light from the prism 1'. The light processed by the fixed lens group 2' and the focusing lens group 4' can be imaged in the image sensor 3'.

[0146] The optical lens also contains a drive mechanism (such as a focusing motor) (not shown in the figure). When focusing is required, the focusing motor drives the focusing lens group 4' to move back and forth along the optical axis to achieve optical focusing. However, the focusing stroke of the focusing lens group 4' is relatively large, and the precision control during its movement is also difficult. This makes it difficult for the optical lens to focus accurately, resulting in low focusing accuracy and making it difficult to guarantee the image quality of the optical lens.

[0147] In view of this, embodiments of this application provide an optical lens, a camera module, and an electronic device, which improve the structure of the optical lens and shorten the focusing stroke of the focusing lens group to solve the problem of low focusing accuracy of optical lenses in the prior art.

[0148] This application first provides an electronic device, which may be, for example, a mobile phone, tablet computer, laptop computer, television set, in-vehicle equipment, wearable device, personal digital assistant (PDA), point of sale (POS), camera, video surveillance equipment, or other electronic products with photography or video recording functions. A mobile phone may be, for example, a conventional candybar phone or a foldable phone, such as a small vertical folding phone, a left-right inward folding phone, or a left-right outward folding phone. Wearable devices may be, for example, smart bracelets, smartwatches, wireless headphones, augmented reality (AR) glasses, AR headsets, virtual reality (VR) glasses, or VR headsets. This application embodiment uses a mobile phone as an example for illustration.

[0149] Figure 3 This is a schematic diagram of the structure of the electronic device 1000 provided in the embodiments of this application. The embodiments of this application use a mobile phone as an example for description.

[0150] Reference Figure 3 The electronic device 1000 includes a housing 100, a display screen 200, an image processor (not shown), and a camera module 300. In some embodiments, the housing 100 includes a frame 1001 and a back cover 1002. The frame 1001 and the back cover 1002 can be integrally formed or assembled into an integral structure. The display screen 200 and the back cover 1002 are respectively mounted on both sides of the frame 1001, together enclosing the internal cavity of the device. The display screen 200 can be a liquid crystal display (LCD) screen, an organic light emitting diode (OLED) screen, etc., wherein the OLED screen can be a flexible display screen or a rigid display screen.

[0151] The display screen 200 can be used to display images and can also integrate touch functionality for human-computer interaction. The camera module 300 is housed within the overall cavity of the device. The camera module 300 is used to acquire optical information from outside the electronic device 1000 and form corresponding image signals. The image processor is communicatively connected to the camera module 300. The image processor acquires and processes the image signals from the camera module 300. The communication connection between the camera module 300 and the image processor can include data transmission via electrical connections such as wiring, or data transmission via coupling. It is understood that the camera module 300 and the image processor can also communicate via other methods capable of data transmission.

[0152] In practical applications, the electronic device 1000 may have one camera module 300, or it may have two, three, four, five, or more camera modules 300, including the camera module 300. When there are multiple camera modules 300, they can be arranged on the side of the electronic device 1000 in a certain way. For example, one or more of them may be located on the front side where the display screen 200 is located, serving as a front-facing camera, while the remaining one or more camera modules 300 may be located on the rear cover 1002, serving as a rear-facing camera.

[0153] In some examples, electronic device 1000 may include one or more of the following: a front-facing camera (module), a rear-facing camera, a main camera lens, a secondary camera lens, a telephoto lens, an ultra-wide-angle lens, a macro lens, or a depth-of-field lens, and camera module 300 may be any of the aforementioned lenses.

[0154] In some examples, the back cover 1002 may have a camera hole through which the camera module 300 collects light. The camera module 300 can be used as a rear camera of the electronic device 1000. Exemplarily, the electronic device 1000 may also include a lens protective lens 1003 for protecting the lens module. The lens protective lens 1003 is disposed on the housing 100 and covers the lens module. When the lens protective lens 1003 is used to protect the front-facing lens module, it may cover only the front-facing lens module or cover the entire front of the electronic device 1000. When the lens protective lens 1003 covers the entire front of the electronic device 1000, it can simultaneously protect both the front-facing lens module and the display screen 200. The lens protective lens 1003 is essentially a cover glass (CG). When the lens protective lens 1003 is used to protect the rear lens module, it can cover the entire back of the electronic device 1000, or it can be placed only at the corresponding position of the rear lens module to protect it. The lens protective lens 1003 can be made of glass, sapphire, ceramic, etc., and this application embodiment does not impose any special limitations. In some embodiments, the lens protective lens 1003 is transparent, so that light from outside the electronic device 1000 can pass through the lens protective lens 1003 and enter the lens module.

[0155] In some examples, the electronic device 1000 may also include an analog-to-digital converter (also called an A / D converter, not shown in the figure). The analog-to-digital converter is connected between the camera module 300 and the image processor. The analog-to-digital converter is used to convert the analog image signal generated by the camera module 300 into a digital image signal and transmit it to the image processor. The image processor then processes the digital image signal to obtain a processed image signal, which can be displayed as an image or video on the display screen 200.

[0156] In some examples, the electronic device 1000 may also include a memory (not shown) communicatively connected to an image processor. The image processor transmits processed image signals to the memory so that the processed image signals can be retrieved from the memory and displayed on the display screen 200 whenever the image needs to be viewed later. In some embodiments, the image processor may also compress the processed image signals before storing them in the memory to save memory space.

[0157] It should be understood that Figure 3 The electronic device 1000 shown is not limited to the above-mentioned devices, but may also include other devices, such as batteries, flashlights, fingerprint recognition modules, earpieces, buttons, sensors, etc. This application embodiment only uses an electronic device 1000 with a lens module as an example for illustration, but the components installed on the electronic device 1000 are not limited to this.

[0158] Figure 4 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in one embodiment of this application. The camera module 300 provided in this embodiment is disposed in the inner cavity of the device, as shown in the attached diagram. Figure 4 The camera module 300 includes an optical lens 1 and an image sensor 2. The image sensor 2 can be positioned on the imaging surface of the camera module 300, specifically on the image side of the optical lens 1. Light rays processed by the optical lens 1 are then recognized by the image sensor 2. The camera module 300 may also include a circuit board (not shown), on which the image sensor 2 can be mounted. Exemplarily, the camera module 300 operates as follows: light reflected from the subject passes through the optical lens 1 to generate an optical image, which is projected onto the image sensor 2. The image sensor 2 converts the optical image into an electrical signal, i.e., an analog image signal, and transmits it to an analog-to-digital converter (ADC), which then converts it into a digital image signal for the image processor.

[0159] Image sensor 2 (also known as a photosensitive element) is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When illuminated, these photodiodes generate electrical charges. Image sensor 2 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS). CCDs are made using a highly sensitive semiconductor material that converts light into electrical charges. They consist of many photosensitive units, typically measured in megapixels. When the surface of the CCD (the photosensitive surface) is illuminated, each photosensitive unit reflects a charge onto the component. The signals generated by all the photosensitive units are combined to form a complete image. CMOS primarily utilizes silicon and germanium, creating a semiconductor where N-polar and P-polar electrodes coexist. The current generated by these complementary effects can be recorded and interpreted by the processing chip as an image.

[0160] In some examples, refer to Figure 4The camera module 300 also includes a filter 3. The filter 3 can be located between the optical lens 1 and the image sensor 2 to filter out unwanted wavelengths of light, preventing the image sensor 2 from producing false colors or ripples, thereby improving its effective resolution and color reproduction. Exemplarily, the filter 3 can be an infrared filter, such as an infrared radiation-cut filter (IRCF). In this embodiment, the filter 3 is a separate component located between the optical lens 1 and the image sensor 2. In other embodiments, the filter 3 can be placed at any position before the image sensor 2, or the filter 3 can be omitted entirely, and filtering can be achieved by surface treatment or material treatment of at least one optical element of the optical lens 1. This application does not strictly limit the specific embodiments of the structure or component used to achieve filtering.

[0161] For example, filter 3 can be achieved by evaporating an infrared (IR) material coating onto a sapphire substrate.

[0162] For example, filter 3 can be a white glass filter or a blue glass filter, etc.

[0163] In some embodiments, the optical lens 1 may further include an aperture stop 70, see reference 1. Figure 4 The aperture stop 70 can be located on the object side of the first lens group 10; in other embodiments, the aperture stop 70 can be located between the first lens group 10 and the first prism 20; in still other embodiments, the aperture stop 70 can also be located between the first prism 20 and the second lens group 30. It should be understood that the aperture stop 70 can be used to adjust the aperture, filter out stray light, and improve the imaging quality of the lens module.

[0164] The aperture stop 70 can be a spacer structure or a variable fan-blade structure; alternatively, the aperture stop 70 can be achieved through a surface coating process, such as forming the aperture stop 70 by coating a light-shielding material onto the lens. The position of the aperture stop 70 can be fixed or variable. For example, the position of the aperture stop 70 can be variable, allowing it to be adjusted according to focusing conditions to be positioned between different lenses.

[0165] The embodiments of this application mainly involve structural improvements to the optical lens 1. The structure of the optical lens 1 will be described in detail below with reference to the accompanying drawings.

[0166] Figure 5 This is a schematic diagram showing the positional changes of the first lens group 10 and the second lens group 30 during the focusing process of the optical lens 1 provided in this application embodiment. (Refer to...) Figure 4 and Figure 5This application provides an optical lens 1, comprising a first lens group 10, a first prism 20, and a second lens group 30 arranged sequentially from the object side to the image side. The first lens group 10 has positive optical power and is a focusing lens group, used to receive light incident on the optical lens 1. The first prism 20 is used to reflect the light from the first lens group 10 at least twice. The second lens group 30 has negative optical power and is also a focusing lens group, used to receive light emitted from the first prism 20. Here, a focusing lens group refers to a lens group that can change its position, shape, or optical power parameters to achieve or assist in achieving the optical focusing performance of the optical lens 1. Generally, a focusing lens group achieves optical focusing of the optical lens 1 by moving along its corresponding optical axis. In the embodiments of this application, both the first lens group 10 and the second lens group 30 are focusing lens groups that are movable along their corresponding optical axes. In this configuration, at least one of the first lens group 10 and the second lens group 30 is movable to achieve optical focusing of the optical lens 1. In other words, the optical lens 1 achieves optical focusing by selectively moving at least one of the first lens group 10 and the second lens group 30.

[0167] It should be noted that at least one of the first lens group 10 and the second lens group 30 is in a movable state. This can mean that at least one of the first lens group 10 and the second lens group 30 moves to achieve optical focusing of the optical lens 1. In other words, the first lens group 10 and the second lens group 30 can be moved sequentially to achieve optical focusing, or the first lens group 10 and the second lens group 30 can be moved simultaneously to achieve optical focusing.

[0168] In some embodiments, during the focusing process of the optical lens 1, the first lens group 10 can be moved first, and after the first lens group 10 comes to a stop, the second lens group 30 can be moved; or the second lens group 30 can be moved first, and after the second lens group 30 comes to a stop, the first lens group 10 can be moved. That is, in this embodiment, the first lens group 10 and the second lens group 30 will not move simultaneously. When one of the first lens group 10 and the second lens group 30 moves, the other remains stationary. This makes it easier to calculate the impact of the position changes of each lens group on the focusing effect of the optical lens 1, thereby reducing the design difficulty of the optical lens 1. When one lens group moves to its extreme position and the optical lens 1 is not in sharp focus, the other... Each lens group can move in turn to continue changing the direction of the light path within the optical lens 1, allowing the optical lens 1 to continue focusing. Thus, the sum of the focusing travel of the two lens groups is equivalent to the total focusing travel of the optical lens 1. Conversely, the total focusing travel of the optical lens 1 is divided into several segments, each segment being completed by a corresponding focusing lens group, and each segment having a focusing travel shorter than the total focusing travel of the optical lens 1. This reduces the focusing travel of the first lens group 10 and the second lens group 30. In some embodiments, the optical lens 1 may also include focusing lens groups other than the first lens group 10 and the second lens group 30, meaning the number of focusing lens groups within the optical lens 1 can be greater than two.

[0169] In addition, in some other embodiments, during the focusing process of the optical lens 1, the first lens group 10 and the second lens group 30 can be moved simultaneously. That is, the second lens group 30 is moved synchronously while the first lens group 10 is moved. The positions of the first lens group 10 and the second lens group 30 change at the same time and there is a relative displacement between them. In this way, the influence of the first lens group 10 and the second lens group 30 on light is also changed. This allows the first lens group 10 and the second lens group 30 to cooperate with each other to amplify the impact of the movement of a single focusing lens group on image sharpness. It also helps to shorten the focusing distance of a single focusing lens group.

[0170] Figure 6 This is a schematic diagram of an optical system provided in an embodiment of this application. The optical system includes a positive mirror group W1 and a negative mirror group W2, wherein the optical power of the positive mirror group W1 is positive and the optical power of the negative mirror group W2 is negative. (Refer to...) Figure 6In (a), this optical system can be referred to as the first optical system. The first optical system includes a negative mirror group W2 and a positive mirror group W1, and the negative mirror group W2 and the positive mirror group W1 are arranged sequentially from the object side to the image side. The light entering the first optical system first passes through the negative mirror group W2 and then through the positive mirror group W1. It can be understood that the negative mirror group W2 has a diverging effect on the light entering the first optical system. Thus, in the direction perpendicular to the optical axis, the first optical system needs a large space to accommodate the light so that the light can propagate. In addition, in order for the light to converge correctly in the subsequent positive mirror group W1, the size of the positive mirror group W1 needs to be increased. Thus, the space of the first optical system needs to be further increased to accommodate the positive mirror group W1. Furthermore, the first optical system needs to have a large backstop to meet the imaging requirements. The backstop refers to the distance from the last mirror in the optical system to the imaging plane. A large backstop will increase the overall length of the first optical system, thus making the overall size of the first optical system large. Figure 6 In (b), this optical system can be referred to as the second optical system. The second optical system includes a positive mirror group W1 and a negative mirror group W2, and the positive mirror group W1 and the negative mirror group W2 are arranged sequentially from the object side to the image side. The light entering the second optical system first passes through the positive mirror group W1 and then through the negative mirror group W2. It can be understood that the positive mirror group W1 has a converging effect on the light entering the second optical system. Thus, the light processed by the positive mirror group W1 mainly propagates in a converging imaging direction. Compared with the first optical system, the propagation direction of light in the second optical system is relatively simple. Therefore, no additional space is needed within the second optical system to accommodate diverging light rays. Furthermore, since the light rays within the second optical system primarily propagate towards converging imaging, the light rays incident on the negative mirror group W2 are more convergent. The size of the negative mirror group W2 can be made smaller, reducing its space occupation within the second optical system. This further reduces the overall size of the second optical system. Additionally, the second optical system has lower backstop requirements, so no additional dimensions are needed to meet specific backstop requirements in the design. Thus, the overall size of the second optical system is smaller. Furthermore, referring to… Figure 6 In (b), the effective focal length EFFL of the second optical system is greater than its total optical length TTL, thus the telephoto ratio of the second optical system is larger.

[0171] The optical lens 1 provided in this embodiment has the following beneficial effects: both the first lens group 10 and the second lens group 30 are focusing lens groups, and both the first lens group 10 and the second lens group 30 can move within the optical lens 1; for example, the first lens group 10 and the second lens group 30 can be moved separately. The first lens group 10 can be moved first to improve the imaging sharpness of the optical lens 1. After the first lens group 10 is moved to its extreme position, the second lens group 30 is moved. At this time, the second lens group 30 is equivalent to taking over the first lens group 10, so that the optical lens 1 can continue to perform focusing operations. The optical lens 1 can complete focusing by the alternating movement of the two lens groups, thus reducing the focusing effect of a single lens group. The focal length is reduced, which helps to improve the movement accuracy of the lens group and the focusing accuracy of the optical lens 1. For example, the first lens group 10 and the second lens group 30 can move simultaneously within the optical lens 1. At this time, the first lens group 10 and the second lens group 30 are relatively displaced, and the influence of the first lens group 10 and the second lens group 30 on light is changed. This allows the first lens group 10 and the second lens group 30 to cooperate with each other, thereby amplifying the impact of the movement of a single focusing lens group on image sharpness. This also reduces the focusing distance of a single lens group, reduces the difficulty of controlling the movement of the lens group, and helps to improve the movement accuracy of the lens group and the focusing accuracy of the optical lens 1.

[0172] By setting the first lens group 10 to positive optical power and the second lens group 30 to negative optical power, the first lens group 10 can converge light, making the image of the object clearer. The positive optical power of the first lens group 10 helps to collect and focus light. On the one hand, it can reduce light scattering and loss, and improve the contrast and resolution of the image. On the other hand, it can make the light entering the optical lens 1 propagate in the direction of convergence and imaging, which helps to reduce the space reserved by the optical lens 1 for light propagation and also helps to reduce the size of the second lens group 30, further reducing the size of the optical lens 1. This is conducive to the miniaturization and thinning design of the electronic device 1000. In addition, when the first lens group 10 and the second lens group 30 are used together, the effective focal length EFFL of the optical lens 1 is greater than its total optical length TTL. Thus, the telephoto ratio of the optical lens 1 is larger, which can improve the shooting flexibility of the optical lens 1.

[0173] A first prism 20 is placed between the first lens group 10 and the second lens group 30, and light is reflected at least twice within the first prism 20, which prolongs the propagation path of light within the first prism 20. This is equivalent to increasing the distance between the first lens group 10 and the second lens group 30 on the optical path. As a result, the telephoto ratio of the optical lens 1 can be further increased, thereby making distant objects appear clearer in the image and improving the imaging quality of the optical lens 1. In addition, the first lens group 10, which has positive optical power, has a converging effect on light. Thus, the light emitted from the first prism 20 is more converged, and the light required to pass through the second lens group 30 is smaller. Therefore, the focusing stroke of the second lens group 30 can be reduced accordingly. This reduces the difficulty of controlling the movement of the lens group and helps to improve the movement accuracy of the lens group, thereby improving the focusing accuracy of the optical lens 1.

[0174] With the above configuration, both the first lens group 10 and the second lens group 30 are focusing lens groups, which can reduce the focusing distance of a single lens group. The first lens group 10 has positive optical power, and the first prism 20 reflects light at least twice, which can further reduce the focusing distance of the second lens group 30. This reduces the difficulty of controlling the movement of a single lens group, which is beneficial to improving the movement accuracy of the lens group and the focusing accuracy of the optical lens 1. The first lens group 10 has positive optical power, and the second lens group 30 has negative optical power. The combined use of the first lens group 10 and the second lens group 30 can reduce the size and weight of the optical lens 1, which is beneficial to achieving the miniaturization and thinning design of the electronic device 1000. In addition, the first prism 20 reflects light at least twice, which can increase the telephoto ratio of the optical lens 1. The optical lens 1 can present distant objects more clearly in the image, which is beneficial to improving the imaging quality of the optical lens 1, and thus improving the imaging quality of the electronic device 1000.

[0175] In some embodiments, when the object distance to the target is greater than a preset value, one of the lens groups 10 and 30 moves along the optical axis of the lens group to perform optical focusing; when the object distance to the target is less than or equal to the preset value, the other lens group in the first lens group 10 and 30 moves along the optical axis of the lens group to perform optical focusing. In other words, when the object distance to the target is greater than the preset value, one of the first lens group 10 and 30 is moved to achieve optical focusing of the optical lens 1; when the object distance to the target is less than or equal to the preset value, the other of the first lens group 10 and 30 is moved to achieve optical focusing of the optical lens 1.

[0176] It should be noted that the movement of one of the lens groups 10 and 30 along the optical axis of the lens group can mean that when the first lens group 10 moves, the direction of movement of the first lens group 10 is along the direction of its optical axis. Here, the optical axis of the first lens group 10 refers to the axis perpendicular to the center of each lens in the first lens group 10, and the optical axis of the first lens group 10 is a part of the optical axis of the optical lens 1. Similarly, when the second lens group 30 moves, the direction of movement of the second lens group 30 is along the direction of its optical axis. Here, the optical axis of the second lens group 30 refers to the axis perpendicular to the center of each lens in the second lens group 30, and the optical axis of the second lens group 30 is a part of the optical axis of the optical lens 1.

[0177] It should be noted that the distance to the target being photographed is greater than a preset value. This distance can be a fixed value, greater than the preset value, or it can be a variable value, ranging from infinity to the preset value. Conversely, the distance to the target being photographed is less than or equal to the preset value. This distance can be a fixed value, less than or equal to the preset value, or it can be a variable value ranging from less than or equal to the preset value. When the target is moving, and its distance changes from value A to value B, where value A is greater than the preset value and value B is less than the preset value, this change process can be divided into two stages. The first stage is... When the distance to the target decreases from value A to close to the preset value, the first lens group 10 (or the second lens group 30) can be moved to achieve focusing of the optical lens 1. In the second stage, the distance to the target decreases from the preset value to value B. In this stage, the second lens group 30 (or the first lens group 10) can be moved to achieve focusing of the optical lens 1. When the optical lens 1 changes from target C to target D, and the distance (value C) corresponding to target C is greater than the preset value, while the distance (value D) corresponding to target D is less than or equal to the preset value, target C and target D can be regarded as a target in a moving state, and the distance of the target changes from value C to value D.

[0178] For example, when the object distance to the target is greater than a preset value and varies within a range greater than the preset value, the first lens group 10 can be moved independently to achieve optical focusing of the optical lens 1; when the object distance to the target is less than or equal to the preset value and varies within a range less than or equal to the preset value, the second lens group 30 can be moved independently to achieve optical focusing of the optical lens 1; or, when the object distance to the target is greater than the preset value and varies within a range greater than the preset value, the second lens group 30 can be moved independently to achieve optical focusing of the optical lens 1, and when the object distance to the target is less than or equal to the preset value and varies within a range less than or equal to the preset value... When focusing, the first lens group 10 is moved individually to achieve optical focusing of the optical lens 1. For example, the preset value can be 0.4m, 0.5m, 0.6m or other values. Taking the preset value of 0.5m as an example, if the object distance of the target is greater than 0.5m, that is, when the object distance of the target is in the range of infinity to 0.5m, the first lens group 10 (or the second lens group 30) can be moved to achieve optical focusing of the optical lens 1. When the object distance of the target is less than or equal to 0.5m, the second lens group 30 (or the first lens group 10) can be moved to achieve optical focusing of the optical lens 1.

[0179] When the distance to the target is greater than a preset value and changes within the range of the preset value, focusing is achieved by moving the first lens group 10 (or the second lens group 30) alone. Compared with moving the first lens group 10 and the second lens group 30 simultaneously, the parameter changes of the optical lens 1 are simpler, which makes calculation easier and reduces the design difficulty of the optical lens 1. Similarly, when the distance to the target is less than or equal to the preset value and changes within the range of the preset value, focusing is achieved by moving the second lens group 30 (or the first lens group 10), which also makes calculation easier and reduces the design difficulty of the optical lens 1.

[0180] The object distance of the target is compared with a preset value. Based on the comparison result, the first lens group 10 or the second lens group 30 is moved. For example, as the object distance of the target gradually decreases from infinity to close to the preset value, the first lens group 10 can be moved continuously to achieve focusing. This can improve the focusing speed of the optical lens 1. In addition, the parameter changes brought to the optical lens 1 by the continuous movement of the first lens group 10 are also continuous, which can facilitate calculation and reduce the design difficulty of the optical lens 1.

[0181] In some embodiments, a mechanical actuator (such as a focusing motor) (not shown in the figure) can be provided in the camera module 300. The mechanical actuator is connected to the controller of the electronic device 1000. Two mechanical actuators can be provided, and the two mechanical actuators drive the first lens group 10 and the second lens group 30 to move respectively, so as to realize the automatic focusing of the optical lens 1.

[0182] In some embodiments, the movement direction and distance of the first lens group 10 and the second lens group 30 can be designed by pre-calibration. For example, before the electronic device 1000 leaves the factory, the position information of the first lens group 10 and the second lens group 30 within the optical lens 1 under different object distances is obtained by testing, and the relevant information parameters are recorded in the memory of the corresponding electronic device 1000. When taking pictures with the electronic device 1000, the camera module 300 of the electronic device 1000 can measure and obtain the actual object distance information, and then feed the actual object distance information back to the controller of the electronic device 1000. The controller and the memory work together to feed back the movement information of the first lens group 10 and the second lens group 30 to the corresponding mechanical actuators, and the corresponding mechanical actuators drive the first lens group 10 and the second lens group 30 to move, thereby realizing the automatic focusing of the optical lens 1.

[0183] In some embodiments, when the optical lens 1 is changed from shooting target C to shooting target D, and the object distance (C value) corresponding to shooting target C is greater than a preset value, while the object distance (D value) corresponding to shooting target D is less than a preset value, the controller and memory work together to feed back the movement information of the first lens group 10 and the second lens group 30 to the corresponding mechanical actuators. At this time, the mechanical actuators corresponding to the first lens group 10 can drive the first lens group 10 to move to the limit position, and the mechanical actuators corresponding to the second lens group 30 can drive the second lens group 30 to move to the corresponding position at the same time as the first lens group 10 moves. That is, the two mechanical actuators are started at the same time, or the second lens group 30 can be driven to move to the corresponding position after the first lens group 10 has stopped, so that the optical lens 1 can focus.

[0184] Reference Figure 5 When the object distance to the target is greater than a preset value and the object distance gradually decreases, the first lens group 10 moves towards the object side of the optical lens 1; when the object distance to the target is less than or equal to the preset value and the object distance gradually decreases, the second lens group 30 moves towards the image side of the optical lens 1. When the target is at infinity, the first lens group 10 and the second lens group 30 within the optical lens 1 can be positioned... Figure 5 At the position shown in (a), when the object distance to the target decreases to near a preset value, the first lens group 10 inside the optical lens 1 can move toward the object side of the optical lens 1, allowing the first lens group 10 to move from... Figure 5 The position of (a) in the middle changes to Figure 5 In position (b), when the object distance to the target continues to decrease from the preset value, the second lens group 30 within the optical lens 1 can move towards the image side of the optical lens 1, allowing the second lens group 30 to... Figure 5 The position of (b) in the middle changes to Figure 5 The position (c) in the text.

[0185] The first lens group 10, with positive optical power, can converge the light rays entering the optical lens 1. As the light rays travel from the first lens group 10 to the second lens group 30, their convergence continuously increases. Increasing the distance between the first lens group 10 and the second lens group 30 is equivalent to lengthening the path of the light rays between them, thus enhancing the convergence of the light rays. It can be understood that when the target is at infinity, the light rays from the target are incident in an approximately parallel manner. As the object distance to the target gradually decreases, the light rays from the target gradually approach a divergent manner, that is, the convergence of light rays near the object distance... The convergence degree is lower than that of light rays at a greater object distance. As the object distance gradually decreases, the light rays entering the optical lens 1 gradually diverge. Moving the first lens group 10 toward the object side of the optical lens 1 is equivalent to increasing the distance between the first lens group 10 and the second lens group 30, and lengthening the optical path between the first lens group 10 and the second lens group 30, so that the light rays can converge on the imaging surface. Correspondingly, moving the second lens group 30 toward the image side of the optical lens 1 is also equivalent to increasing the distance between the first lens group 10 and the second lens group 30, and lengthening the optical path between the first lens group 10 and the second lens group 30, so that the light rays can converge on the imaging surface.

[0186] In some embodiments, when the optical lens 1 is photographing a target at infinity, the first lens group 10 and the second lens group 30 within the optical lens 1 can be configured as follows: Figure 5 The arrangement shown in (a) indicates that when the optical lens 1 is shooting at a target at a distance of 0.5m, the first lens group 10 and the second lens group 30 within the optical lens 1 can be arranged as follows: Figure 5 The arrangement shown in (b) is such that, compared to Figure 5 (a) in the middle, Figure 5 In (b), the first lens group 10 moves a certain distance toward the object side; when the optical lens 1 takes a picture of the target at an object distance of 0.27m, the first lens group 10 and the second lens group 30 within the optical lens 1 can be adjusted... Figure 5 The arrangement shown in (c) is as follows, where, compared to Figure 5 (b) in the middle Figure 5 The second mirror group 30 in (c) has moved a distance toward the image side.

[0187] Figure 7 yes Figure 4 The modulation transfer function (MTF) of optical lens 1 at infinity object distance is shown in the figure. Figure 8 yes Figure 4 The modulation transfer function of optical lens 1 at an object distance of 0.5m is shown in the figure. Figure 9 yes Figure 4The modulation transfer function of optical lens 1 at an object distance of 0.27m is shown in the figure; where, Figure 7 This is the defocusing MTF curve of the optical lens 1 in this embodiment at a spatial frequency of 80 lp / mm at an infinity object distance, derived from... Figure 7 It can be seen that the modulation transfer function (MTF) at infinity object distances under different fields of view is concentrated between 0.3 and 0.7, which indicates that... Figure 4 The optical lens 1 shown can achieve high-quality imaging at an infinity object distance, that is, the optical lens 1 can clearly capture objects at an infinity object distance. Figure 8 This is the defocusing MTF curve of the optical lens 1 in this embodiment at a spatial frequency of 80 lp / mm at an object distance of 0.5 m. Figure 8 It can be seen that the modulation transfer function (MTF) at different fields of view with an object distance of 0.5m is concentrated between 0.4 and 0.8. This result indicates that... Figure 4 The optical lens 1 shown can achieve high-quality imaging at an object distance of 0.5m, that is, the optical lens 1 can clearly capture objects at an object distance of 0.5m. Thus, the movement of the first lens group 10 can enable the optical lens 1 to focus. Figure 9 This is the defocusing MTF curve of the optical lens 1 in this embodiment at a spatial frequency of 80 lp / mm at an object distance of 0.27 m. Figure 9 It can be seen that the modulation transfer function (MTF) at different fields of view with an object distance of 0.27m is concentrated between 0.4 and 0.7. This result indicates that... Figure 4 The optical lens 1 shown can achieve high-quality imaging at an object distance of 0.27m, that is, the optical lens 1 can clearly capture objects at an object distance of 0.27m. Thus, the movement of the second lens group 30 can enable the optical lens 1 to focus.

[0188] Reference Figure 4 and Figure 5 The first lens group 10 moves in a direction parallel to the light incident direction of the optical lens 1, while the second lens group 30 moves at an angle relative to the light incident direction of the optical lens 1; see reference. Figure 4In this embodiment, the X-axis direction in the figure represents the thickness direction of the electronic device 1000, the Y-axis direction represents the length direction of the electronic device 1000, and the Z-axis direction represents the width direction of the electronic device 1000. The light incident direction of the optical lens 1 is parallel to the X-axis direction in the figure. The first lens group 10 is disposed at the light incident position of the optical lens 1. The movement direction of the first lens group 10 is parallel to the light incident direction of the optical lens 1. The empty area of ​​the optical lens 1 at the light incident position can be used to provide the space required for the movement of the first lens group 10. In this way, the optical lens 1 can reduce the extra space reserved for focusing the first lens group 10, which is beneficial to reducing the size of the optical lens 1. The movement direction of the second lens group 30 is tilted relative to the light incident direction of the optical lens 1 and the thickness direction of the electronic device 1000. In this way, the movement component of the second lens group 30 in the thickness direction of the electronic device 1000 can be reduced. This can reduce the size of the optical lens 1 in the thickness direction of the electronic device 1000, which is beneficial to realizing the thin and light design of the electronic device 1000.

[0189] In some embodiments, the second mirror group 30 can be along Figure 4 Move in the first direction as shown; Figure 10 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 10 In other embodiments, the second mirror group 30 can be along... Figure 10 The second direction of movement is shown; regardless of whether the second lens group 30 moves along the first or second direction, the second lens group 30 has a movement component in the Y-axis direction shown in the figure. In some embodiments, the electronic device 1000 adopts a large-screen design, that is, the electronic device 1000 has a large size in the Y-axis and Z-axis directions shown in the figure. In this way, the electronic device 1000 has more space in the Y-axis direction shown in the figure to accommodate the optical lens 1. In some embodiments, the camera module 300 is provided with mechanical actuators for driving the first lens group 10 and the second lens group 30 to move. The first lens group 10 and the corresponding mechanical actuators can be arranged in the Z-axis direction shown in the figure, and the second lens group 30 and the corresponding mechanical actuators can also be arranged in the Z-axis direction shown in the figure. In this way, the mechanical actuators will not occupy or excessively occupy the space of the electronic device 1000 in the thickness direction, which is conducive to the thin and light design of the electronic device 1000.

[0190] For example, the first lens group 10 can move along its optical axis, which can be parallel to the incident light direction of the optical lens 1, i.e., parallel to the X-axis direction shown in the figure; the second lens group 30 can move along its optical axis, which can be tilted relative to the incident light direction of the optical lens 1. In some embodiments, the optical axis of the second lens group 30 can be parallel to the incident light direction of the optical lens 1. Figure 4 In the first orientation shown, in other embodiments, the optical axis direction of the second mirror group 30 may be parallel to... Figure 10 The second direction setting is shown.

[0191] In some embodiments, the focal length of optical lens 1 is M1 when in long-distance shooting mode and M2 when in close-range shooting mode. Optical lens 1 satisfies the following relationship: 0.8 ≤ M1 / M2 ≤ 1.2. By controlling the ratio of the focal length M1 when optical lens 1 is in long-distance shooting mode to the focal length M2 when in close-range shooting mode between 0.8 and 1.2, the focal length of optical lens 1 changes little between long-distance and close-range shooting. Thus, the focusing stroke of optical lens 1 is shorter, which can reduce the size of optical lens 1. In addition, it can also improve the focusing speed of optical lens 1. For example, when optical lens 1 is used to shoot fast-moving objects or in scenarios that require fast focusing, optical lens 1 can complete focusing more quickly, thereby capturing a clear image. Furthermore, the small change in focal length of optical lens 1 between long-distance and close-range shooting allows for imaging optimization for a single focal length, thereby reducing optical defects such as aberrations and distortion of optical lens 1, enabling electronic device 1000 to capture clear and detailed images.

[0192] It should be noted that the focal length of optical lens 1 can be the focal length of optical lens 1 with respect to a specific wavelength of light. It is understandable that the same material has different refractive power for different wavelengths of light; this principle produces phenomena commonly seen in daily life. For example, sunlight passing through a prism is decomposed into seven colors, presenting a "rainbow" phenomenon. For example, M1 and M2 of optical lens 1 can be the focal length of optical lens 1 with respect to white light, where the wavelength of white light can be 400nm to 760nm.

[0193] The focal length of optical lens 1 changes little when shooting at long distances and close distances, so optical lens 1 is equivalent to a fixed focal length lens.

[0194] For example, the ratio of the focal length M1 of the optical lens 1 when it is in the long-distance shooting state to the focal length M2 when it is in the close-range shooting state can be 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, or 1.2. In some embodiments, 0.9 ≤ M1 / M2 ≤ 1.1, and the ratio of the focal length M1 of the optical lens 1 when it is in the long-distance shooting state to the focal length M2 when it is in the close-range shooting state can be 0.9, 0.92, 0.94, 0.96, 0.98, 1, 1.02, 1.04, 1.06, 1.08, or 1.1.

[0195] Figure 10 This is a schematic diagram of the structure of the optical lens 1 and the image sensor 2 provided in another embodiment of this application. Figure 11 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 4 , Figure 10 and Figure 11 The optical lens 1 also includes a second prism 60, located on the image side of the second mirror group 30. The second prism 60 reflects light rays from the second mirror group 30. By reflecting the light rays from the second mirror group 30, the second prism 60 changes the direction of light propagation, thereby adjusting the orientation of the image sensor 2. For example, referring to… Figure 11 The image sensor 2 can be tilted, thereby reducing the space occupied by the image sensor 2 in the X-axis direction as shown in the figure, which in turn reduces the space occupied by the image sensor 2 in the thickness direction of the electronic device 1000, thus facilitating the thinner and lighter design of the electronic device 1000; see reference. Figure 4 and Figure 10 The image sensor 2 can be set along the Y-axis and Z-axis directions as shown in the figure, that is, along the length and width directions of the electronic device 1000. In this way, the surface of the image sensor 2 used to receive light can be perpendicular to the thickness direction of the electronic device 1000, reducing the space occupied by the image sensor 2 in the thickness direction of the electronic device 1000, which is beneficial to reducing the thickness of the electronic device 1000.

[0196] Reference Figure 11 , Figure 11 (a) Figure 11 (b) Figure 11 (c) and Figure 11 The second prism 60 shown in (d) reflects each light ray only once. In this embodiment, the light rays emitted from the second prism 60 are inclined relative to the X-axis direction shown in the figure. Therefore, Figure 11 Image sensor 2 can be tilted relative to the X-axis direction shown in the figure; refer to Figure 4 and Figure 10 The second prism 60 in the illustration reflects light twice. In this embodiment, the light rays emitted from the second prism 60 are parallel to the X-axis shown in the illustration. Therefore... Figure 4 Image sensor 2 can be set along the Y-axis and Z-axis directions as shown in the figure.

[0197] Figure 12 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 4 and Figure 12In some embodiments, the light-emitting direction of the second prism 60 is parallel to the light-incident direction of the optical lens 1. Since the light-emitting direction of the second prism 60 is parallel to the light-incident direction of the optical lens 1, the light emitted from the second prism 60 is parallel to the X-axis direction shown in the figure. Thus, the surface of the image sensor 2 used to receive light (this surface is typically the surface with the largest area of ​​the image sensor 2) can be arranged parallel to the Y-axis and Z-axis directions shown in the figure, that is, parallel to the width and length directions of the electronic device 1000. In other words, the surface of the image sensor 2 used to receive light can be perpendicular to the thickness direction of the electronic device 1000. This reduces the space occupied by the image sensor 2 in the thickness direction of the electronic device 1000, which is beneficial for reducing the thickness of the electronic device 1000.

[0198] Reference Figure 4 In some embodiments, the light-emitting direction of the second prism 60 is opposite to the light-incident direction of the optical lens 1. Since the light-emitting direction of the second prism 60 is opposite to the light-incident direction of the optical lens 1, the first lens group 10 and the image sensor 2 can be disposed on the same side of the optical lens 1. Thus, in the Y-axis direction shown in the figure, the image sensor 2 can be flush with the first lens group 10, and the image sensor 2 can be installed in the empty area around the optical lens 1.

[0199] Reference Figure 12 In some embodiments, the light-emitting direction of the second prism 60 is the same as the light-incident direction of the optical lens 1. In this case, the first lens group 10 and the image sensor 2 can be located on opposite sides of the optical lens 1. The location of the image sensor 2 can be designed according to actual needs, and this embodiment does not impose any restrictions.

[0200] Reference Figure 4 The optical lens 1 also includes a folding element 40. Along the optical axis of the optical lens 1, the folding element 40 is located between the first prism 20 and the second prism 60, and is situated on the object side or image side of the second mirror group 30. The folding element 40 includes a reflecting surface 41, which reflects light to the second prism 60. By incorporating the folding element 40 in the optical lens 1, the reflecting surface 41 of the folding element 40 can reflect light, thereby changing the direction of light propagation. This facilitates the design of the positions of various components within the optical lens 1, improves the utilization of space within the optical lens 1, and ultimately helps to reduce the size of the optical lens 1.

[0201] Figure 13 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 4 , Figure 10 and Figure 13In some embodiments, the refracting element 40 can be a prism. In this case, the refracting element 40 also includes an incident surface and an exit surface. Light enters the refracting element 40 from the incident surface, is reflected by the reflecting surface 41, and exits the refracting element 40 from the exit surface. (Refer to...) Figure 11 In (d) of the embodiments, the folding element 40 may also be a reflector, in which case the light is reflected by the reflecting surface 41 of the reflector.

[0202] Reference Figure 4 In some embodiments, the second mirror group 30 can be located on the object side of the folding element 40. That is, the light emitted from the first prism 20 is optically processed by the second mirror group 30 and then reflected by the folding element 40. This can reduce the distance between the first mirror group 10 and the second mirror group 30. It is understood that during the propagation of light after it exits the first mirror group 10 and before it enters the second mirror group 30, the deviation of the light from the optical axis caused by the first mirror group 10 will gradually increase. Shortening the distance between the first mirror group 10 and the second mirror group 30 can shorten the path of the light between the first mirror group 10 and the second mirror group 30. This can reduce the deviation of the light from the optical axis after it exits the first mirror group 10 and before it enters the second mirror group 30, reduce the difficulty of the second mirror group 30 in correcting the aberrations generated by the first mirror group 10, reduce the aberrations in the final image, and thus improve the imaging quality of the camera module 300. Figure 10 In other embodiments, the second lens group 30 can be located on the image side of the folding element 40, that is, after the light is reflected by the folding element 40, it enters the second lens group 30 for optical processing. In this way, the distance between the first lens group 10 and the second lens group 30 can be increased, thereby further improving the telephoto ratio of the optical lens 1 and thus improving the shooting flexibility of the electronic device 1000.

[0203] Figure 14 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 14 In some embodiments, the folding element 40 is connected to the first prism 20, so that the folding element 40 and the first prism 20 can form a whole, which can reduce the number of parts inside the optical lens 1 and facilitate the assembly of the optical lens 1.

[0204] For example, the folding element 40 can be a prism, and the incident surface of the folding element 40 can be connected to the side of the first prism 20. The folding element 40 can also be integrally formed with the first prism 20. "Integral forming" is a common expression, which usually refers to the fact that an object or product is manufactured in a whole and continuous manner, rather than by processing and assembling multiple parts separately, so as to form a complete and seamless whole. This manufacturing method can reduce assembly links, improve production efficiency, ensure the structural strength and stability of the product, and reduce the possibility of defects in the connection parts. In this embodiment, the whole prism blank can be cut or forged to form an integral folding element 40 and the first prism 20. The integral setting of the folding element 40 and the first prism 20 can improve the connection strength between the folding element 40 and the first prism 20, thereby improving the stability of the connection between the two, and thus improving the imaging quality of the optical lens 1.

[0205] Figure 15 This is a schematic diagram of the structure of the optical lens 1 and image sensor 2 provided in another embodiment of this application; see reference. Figure 15 In other embodiments, the folding element 40 is connected to the second prism 60. In this way, the folding element 40 and the second prism 60 can be formed as a whole, which can reduce the number of parts inside the optical lens 1 and facilitate the assembly of the optical lens 1.

[0206] For example, the folding element 40 can be a prism, and the exit surface of the folding element 40 can be connected to the side surface of the second prism 60. The folding element 40 can also be integrally formed with the second prism 60. In this embodiment, the entire prism blank can be cut or forged to form an integral folding element 40 and second prism 60. The integral setting of the folding element 40 and the second prism 60 can improve the connection strength between the folding element 40 and the second prism 60, thereby improving the stability of the connection between the two and thus improving the imaging quality of the optical lens 1.

[0207] Reference Figure 4In some embodiments, the second prism 60 includes a first side surface 61, a second side surface 62, and a third side surface 63. A first angle, less than 45°, is formed between the second side surface 62 and the third side surface 63. Light rays entering the second prism 60 from the first side surface 61 are reflected sequentially by the third side surface 63 and the second side surface 62, and exit from the third side surface 63. It should be noted that the third side surface 63 is a surface where light transmission and total internal reflection occur. Light rays entering the second prism 60 from the first side surface 61 undergo total internal reflection at the third side surface 63 and then travel towards the second side surface 62. The light rays reflected from the second side surface 62 finally pass through the third side surface 63 and exit the second prism 60. In other words, the third side surface 63 can transmit light rays exiting the second prism 60. A reflective coating can be applied to the second side surface 62 to enhance its reflectivity.

[0208] It should be understood that the first included angle α formed between the second side 62 and the third side 63 is less than 45° (e.g., α is 25°). For example, the range of α can be: 0° < α < 10°, 10° ≤ α < 20°, 20° ≤ α < 25°, 25° ≤ α < 30°, 30° ≤ α < 35°, 35° ≤ α < 40°, 40° ≤ α < 45°. For example, the range of α can be: 22° < α < 28°.

[0209] Setting the angle of the first included angle formed between the second side surface 62 and the third side surface 63 of the second prism 60 to less than 45° helps to reduce the size of the optical lens 1 in the X-axis direction (i.e., the thickness direction of the electronic device 1000) as shown in the figure, thereby helping to reduce the size of the camera module 300 in the thickness direction of the electronic device 1000, which is beneficial to reducing the thickness of the electronic device 1000.

[0210] In the above embodiments, the second prism 60 is a non-45° prism. In other embodiments, the second prism 60 can also be selected from other types of prisms to achieve at least two reflections of light. For example, a Schmidt-Pechan prism, an Abbe-Koenig prism, or a Porro prism can be selected.

[0211] In some embodiments, the first included angle α and the refractive index n1 of the second prism 60 satisfy: n1≥1 / sin(2α), so that the third side surface 63 can achieve total internal reflection of light, which can reduce the loss of light in the second prism 60.

[0212] Reference Figure 4In some embodiments, the first prism 20 includes a fourth side surface 21, a fifth side surface 22, and a sixth side surface 23. A second angle, less than 45°, is formed between the fourth side surface 21 and the fifth side surface 22. Light rays entering the first prism 20 from the fourth side surface 21 are reflected sequentially by the fifth side surface 22 and the fourth side surface 21, and exit from the sixth side surface 23. It should be noted that the fourth side surface 21 is a surface where light transmission and total internal reflection occur. The transmitted light rays enter the second prism 60, are reflected by the fifth side surface 22, and then strike the fourth side surface 21, where total internal reflection occurs. The light rays reflected from the fourth side surface 21 finally exit the first prism 20 through the sixth side surface 23. A reflective coating can be applied to the fifth side surface 22 to enhance its reflectivity.

[0213] It should be understood that the second included angle β formed between the fourth side 21 and the fifth side 22 is less than 45° (e.g., β is 25°). For example, the range of β can be: 0° < β < 10°, 10° ≤ β < 20°, 20° ≤ β < 25°, 25° ≤ β < 30°, 30° ≤ β < 35°, 35° ≤ β < 40°, 40° ≤ β < 45°. For example, the range of β can be: 22° < β < 28°.

[0214] Setting the angle of the second included angle formed between the fourth side surface 21 and the fifth side surface 22 of the first prism 20 to less than 45° helps to reduce the size of the optical lens 1 in the X-axis direction (i.e., the thickness direction of the electronic device 1000) as shown in the figure, thereby helping to reduce the size of the camera module 300 in the thickness direction of the electronic device 1000, which is beneficial to reducing the thickness of the electronic device 1000.

[0215] In the above embodiments, the first prism 20 is a non-45° prism. In other embodiments, the first prism 20 can also be selected from other types of prisms to achieve at least two reflections of light. For example, a Schmidt-Behan prism, an Abbe-Corni prism, or a Pro prism can be selected.

[0216] In some embodiments, the second included angle β and the refractive index n2 of the first prism 20 satisfy: n2≥1 / sin(2β), so that the fourth side surface 21 can achieve total internal reflection of light, which can reduce the loss of light in the first prism 20.

[0217] In some embodiments, both the first prism 20 and the second prism 60 can be non-45° prisms.

[0218] In some embodiments, the first included angle α and the second included angle β are equal in size, so that light can be emitted from the second prism 60 along the X-axis direction shown in the figure. At this time, the surface of the image sensor 2 used to receive light (this surface is usually the surface with the largest area of ​​the image sensor 2) can be designed to be parallel to the Y-axis direction and the Z-axis direction shown in the figure. That is, the surface of the image sensor 2 used to receive light can be perpendicular to the thickness direction of the electronic device 1000 (the X-axis direction shown in the figure), which reduces the space occupied by the image sensor 2 in the thickness direction of the electronic device 1000 and is beneficial to reducing the thickness of the electronic device 1000.

[0219] For example, the ranges of α and β can be: 0°<α=β<10°, 10°≤α=β<20°, 20°≤α=β<25°, 25°≤α=β<30°, 30°≤α=β<35°, 35°≤α=β<40°, and 40°≤α=β<45°.

[0220] For example, the ranges of α and β can be: 22° < α = β < 28°.

[0221] In some embodiments, the sixth side surface 23 of the first prism 20 may be a surface with optical power, so that the first prism 20 has the ability to converge / diverge light, and thus the first prism 20 can correct aberrations.

[0222] In some embodiments, the first side surface 61 of the second prism 60 may be a surface with optical power, so that the second prism 60 has the ability to converge / diverge light, and thus the second prism 60 can correct aberrations.

[0223] Continue to refer to Figure 4 The optical lens 1 further includes a third lens group 50, which has negative optical power. The third lens group 50 is located on the image side of the first prism 20 and on the object side or image side of the second lens group 30. In some embodiments, the third lens group 50 may be located on the image side of the second lens group 30, that is, the second lens group 30 is located between the first lens group 10 and the third lens group 50, as shown in the figure. Figure 10 In other embodiments, the third mirror group 50 may be located on the object side of the second mirror group 30, that is, the third mirror group 50 is located between the first mirror group 10 and the second mirror group 30.

[0224] Reference Figure 6 In (c), this optical system can be referred to as the third optical system. The third optical system includes a positive mirror group W1 and two negative mirror groups W2. The positive mirror group W1 and the two negative mirror groups W2 are arranged sequentially from the object side to the image side. The light entering the third optical system first passes through the positive mirror group W1, and then sequentially passes through the two negative mirror groups W2. (Compare) Figure 6 (c) and Figure 6In (b), when the total optical length TTL remains constant or changes only slightly, the effective focal length EFFL of the third optical system is much greater than that of the second optical system. Thus, the ratio between the effective focal length EFFL of the third optical system and the total optical length TTL is greater than that of the second optical system. In other words, the telephoto ratio of the third optical system is greater than that of the second optical system. Therefore, adding a negative lens group to the optical system can increase the telephoto ratio of the optical system.

[0225] Thus, by adding a third lens group 50 with negative optical power into the optical lens 1, the telephoto ratio of the optical lens 1 can be further increased, thereby improving the shooting flexibility of the optical lens 1; in addition, the third lens group 50 can also correct aberrations, thereby improving the imaging quality of the optical lens 1.

[0226] In some embodiments, the third lens group 50 may remain stationary during the focusing process of the optical lens 1.

[0227] For example, the optical lens 1 also includes a folding element 40, as shown in reference. Figure 4 , Figure 5 , Figure 11 (b) Figure 11 (d) and Figure 13 Within the optical lens 1, a first lens group 10, a first prism 20, a second lens group 30, a folding element 40, a third lens group 50, and a second prism 60 can be arranged sequentially along the direction from the object side to the image side. In some embodiments, the positions of the second lens group 30 and the third lens group 50 can be interchanged. For example, refer to... Figure 10 The optical lens 1 can be arranged in sequence along the direction from the object side to the image side, including the first lens group 10, the first prism 20, the third lens group 50, the folding element 40, the second lens group 30, and the second prism 60.

[0228] Reference Figure 4 In some embodiments, the first lens group 10 may contain only one lens, see reference 10. Figure 13 The first lens group 10 may include two lenses, which may be referred to as the first lens 11 and the second lens 12 respectively. The first lens 11 and the second lens 12 are combined to form the first lens group 10 with positive optical power. When the first lens group 10 moves, the first lens 11 and the second lens 12 can move together without relative displacement between them. In other embodiments, the first lens group 10 may also include three or more lenses, which is not limited in this embodiment.

[0229] In some embodiments, the second lens group 30 may include one lens, or it may include two, three or more lenses. For example, the second lens group 30 may include three lenses, which may be referred to as the third lens 31, the fourth lens 32 and the fifth lens 33, respectively. The third lens 31, the fourth lens 32 and the fifth lens 33 are combined to form the second lens group 30 with negative optical power. When the second lens group 30 moves, the third lens 31, the fourth lens 32 and the fifth lens 33 can move together without relative displacement between them.

[0230] In some embodiments, the third lens group 50 may include one lens, or it may include two, three or more lenses. For example, the third lens group 50 may include two lenses, which may be referred to as the sixth lens 51 and the seventh lens 52, respectively. The sixth lens 51 and the fourth lens 32 are combined to form the third lens group 50 with negative optical power.

[0231] In some embodiments, the lens within the optical lens 1 may be made of plastic or glass; the lens has at least one surface with optical power, which may be spherical, aspherical, or freeform.

[0232] In some embodiments, the composite focal length of the first lens group 10 is F1, the composite focal length of the optical lens 1 is M, and the optical lens 1 satisfies the following relationship: 0.5≤F1 / M≤1.5.

[0233] It should be noted that the overall focal length of the first lens group 10 can be understood as the equivalent focal length exhibited when all lenses within the first lens group 10 are used together. For example, when the first lens group 10 has only one lens, the overall focal length of the first lens group 10 is the focal length of that lens. When the first lens group 10 includes a first lens 11 and a second lens 12, the overall focal length of the first lens group 10 can be understood as the equivalent focal length exhibited when the first lens 11 and the second lens 12 are used together. The refraction effect of light after passing through the first lens 11 and the second lens 12 can be equivalent to a single lens with a specific focal length. The focal length of this equivalent lens is the overall focal length of the first lens group 10 formed by the combination of the first lens 11 and the second lens 12. Correspondingly, the optical lens 1... The overall focal length can be understood as the equivalent focal length exhibited when all lenses in the optical lens 1 are used together. For example, the optical lens 1 includes a first lens 11, a second lens 12, a third lens 31, a fourth lens 32, a fifth lens 33, a sixth lens 51, and a seventh lens 52. In this case, the overall focal length of the optical lens 1 can be understood as the equivalent focal length exhibited when the first lens 11, the second lens 12, the third lens 31, the fourth lens 32, the fifth lens 33, the sixth lens 51, and the seventh lens 52 are used together. In some embodiments, the focal length of the optical lens 1 is M1 when shooting at a distance and M2 when shooting at a close distance. The overall focal length M of the optical lens 1 can vary between M1 and M2.

[0234] It should be noted that the focal length of optical lens 1 can be the focal length of optical lens 1 with respect to a specific wavelength of light. It is understandable that the same material has different refractive power for different wavelengths of light; this principle produces phenomena commonly seen in daily life. For example, sunlight passing through a prism is decomposed into seven colors, presenting a "rainbow" phenomenon. Similarly, the focal length M of optical lens 1 can be the combined focal length of optical lens 1 with respect to white light, where the wavelength of white light can be between 400nm and 760nm.

[0235] It should be noted that the overall focal length F1 of the first lens group 10 can be the focal length of the first lens group 10 with respect to a certain wavelength of light; for example, the overall focal length F1 of the first lens group 10 can be the focal length of the first lens group 10 with respect to white light, and the wavelength of white light can be 400nm to 760nm.

[0236] It is understandable that for a lens with positive optical power, the smaller its focal length, the stronger its ability to converge light. The stronger the lens's ability to converge light, the greater the deflection of the light's propagation direction after passing through the lens, and the greater the aberration caused by the lens. In other words, the lens has a greater impact on the final image quality. Setting the ratio of the combined focal length F1 of the first lens group 10 to the combined focal length M of the optical lens 1 to not less than 0.5 can control the light-converging ability of the first lens group 10, thereby reducing the aberrations caused by the first lens group 10. In addition, setting the ratio of the combined focal length F1 of the first lens group 10 to the combined focal length M of the optical lens 1 to not more than 1.5 can ensure the light-converging ability of the first lens group 10, so that the first lens group 10 can adjust the optical path during movement, realize the focusing of the optical lens 1, and ensure the image quality of the optical lens 1.

[0237] For example, the ratio of the composite focal length of the first lens group 10 to the composite focal length of the optical lens 1 to M can be set to 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5.

[0238] In some embodiments, the combined focal length of the second lens group 30 is F2, and the optical lens 1 satisfies the following relationship: |F2 / M|≥1.1.

[0239] It should be noted that the overall focal length of the second lens group 30 can be understood as the equivalent focal length exhibited when all lenses in the second lens group 30 are used together. For example, the second lens group 30 may include a third lens 31, a fourth lens 32, and a fifth lens 33. In this case, the overall focal length of the second lens group 30 can be understood as the equivalent focal length exhibited when the third lens 31, the fourth lens 32, and the fifth lens 33 are used together. The refraction effect of light after passing through the third lens 31, the fourth lens 32, and the fifth lens 33 can be equivalent to a single lens with a specific focal length. The focal length of this equivalent lens is the overall focal length of the second lens group 30 formed by the combination of the third lens 31, the fourth lens 32, and the fifth lens 33.

[0240] It should be noted that the second lens group 30 has negative optical power, and its overall focal length is negative, while the overall focal length of the optical lens 1 is positive. Therefore, the ratio between the two can be expressed as an absolute value.

[0241] It is understandable that for a lens with negative optical power, the smaller the absolute value of its focal length, the stronger its ability to diverge light. The stronger the lens's ability to diverge light, the greater the deflection of the light's propagation direction after passing through the lens, and the greater the aberration caused by the lens. In other words, the lens has a greater impact on the final image quality. Setting the ratio of the combined focal length of the second lens group 30 (F2) to the combined focal length of the optical lens 1 (M) to be no less than 1.1 can control the light-gathering ability of the second lens group 30, thereby reducing the aberrations caused by the second lens group 30. In addition, it can also ensure the light-gathering ability of the second lens group 30, so that the optical lens 1 can be focused during the movement of the second lens group 30, thus ensuring the image quality of the optical lens 1.

[0242] For example, the ratio of the composite focal length of the second lens group 30 to the composite focal length of the optical lens 1 to M can be set to 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2.0, or 2.5.

[0243] The overall focal length F2 of the second lens group 30 can be the focal length of the second lens group 30 with respect to a certain wavelength of light; for example, the overall focal length F2 of the second lens group 30 can be the focal length of the second lens group 30 with respect to white light, and the wavelength of white light can be 400nm to 760nm.

[0244] In some embodiments, either the first lens group 10 or the second lens group 30 has a first focal length F11 with respect to light of wavelength λ1, either the first lens group 10 or the second lens group 30 has a second focal length F12 with respect to light of wavelength λ2, and either the first lens group 10 or the second lens group 30 has a third focal length F13 with respect to light of wavelength λ3, wherein λ1 > λ2 > λ3, and the optical lens 1 satisfies the following relationship:

[0245] 0.99≤F11 / F12≤1.01;

[0246] 0.99≤F13 / F12≤1.01.

[0247] For example, λ1 is 650nm, λ2 is 550nm, and λ3 is 435nm.

[0248] It should be noted that the first lens group 10 has positive optical power and its focal length is a positive value, while the second lens group 30 has negative optical power and its focal length is a negative value. If the focal length of the first lens group 10 is compared with the focal length of the second lens group 30, the resulting ratio is negative. This negative value does not satisfy the above-mentioned relationship. In other words, the above-mentioned relationship does not include any limitation on the relationship between the focal lengths of the first lens group 10 and the second lens group 30, and the focal lengths of the first lens group 10 and the second lens group 30 do not need to be compared. In the above formula, F11 / F12 represents the ratio of the first focal length of the first lens group 10 to the second focal length of the first lens group 10 (or the ratio of the first focal length of the second lens group 30 to the second focal length of the second lens group 30), and F13 / F12 represents the ratio of the third focal length of the first lens group 10 to the second focal length of the first lens group 10 (or the ratio of the third focal length of the second lens group 30 to the second focal length of the second lens group 30).

[0249] It is understandable that the same material has different refractive power for different wavelengths of light. This phenomenon is common in daily life. For example, sunlight passing through a prism is decomposed into seven colors, presenting a "rainbow" phenomenon. For optical lens 1, this phenomenon can easily cause chromatic aberration in the image. By controlling the ratio of the first focal length to the second focal length of the first lens group 10 to be between 0.99 and 1.01, and controlling the ratio of the third focal length to the second focal length of the first lens group 10 to be between 0.99 and 1.01, the refractive power of the first lens group 10 for different wavelengths of light can be controlled within a suitable range. This reduces the chromatic aberration produced by the first lens group 10, thereby making the first lens group 10 more resistant to chromatic aberration. When the lens group 10 moves to focus, the chromatic aberration produced by the optical lens 1 is small, thus ensuring the imaging quality of the optical lens 1 when the first lens group 10 moves to focus. By controlling the ratio of the first focal length to the second focal length of the second lens group 30 to be between 0.99 and 1.01, and by controlling the ratio of the third focal length to the second focal length of the second lens group 30 to be between 0.99 and 1.01, the refractive power of the second lens group 30 for light of different wavelengths can be controlled within a suitable range. This reduces the chromatic aberration produced by the second lens group 30, thus ensuring that the chromatic aberration produced by the optical lens 1 is small when the second lens group 30 moves to focus, thereby ensuring the imaging quality of the optical lens 1 when the second lens group 30 moves to focus.

[0250] For example, the ratio of the first focal length of the first lens group 10 to the second focal length of the first lens group 10 can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0251] For example, the ratio of the third focal length of the first lens group 10 to the second focal length of the first lens group 10 can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0252] For example, the ratio of the first focal length of the second lens group 30 to the second focal length of the second lens group 30 can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0253] For example, the ratio of the third focal length of the second lens group 30 to the second focal length of the second lens group 30 can be 0.99, 0.992, 0.994, 0.996, 0.998, 1, 1.002, 1.004, 1.006, 1.008 and 1.01.

[0254] It should be noted that the ratios of the first focal length to the second focal length of the first lens group 10, the ratio of the third focal length to the second focal length of the first lens group 10, the ratio of the first focal length to the second focal length of the second lens group 30, and the ratio of the third focal length to the second focal length of the second lens group 30 can be equal or unequal. Of course, it is also possible that two of them are equal and the other two are unequal, or that three of them are equal and the remaining one is unequal to the other three.

[0255] The value of λ1 can be in the range of 640nm to 660nm. For example, the value of λ1 can be 640nm, 642nm, 644nm, 646nm, 648nm, 650nm, 652nm, 654nm, 656nm, 658nm and 660nm.

[0256] The value of λ2 can be in the range of 540nm to 560nm. For example, the value of λ2 can be 540nm, 542nm, 544nm, 546nm, 548nm, 550nm, 552nm, 554nm, 556nm, 558nm and 560nm.

[0257] The value of λ3 can be in the range of 425nm to 445nm. For example, the values ​​of λ3 can be 425nm, 427nm, 429nm, 431nm, 433nm, 435nm, 437nm, 439nm, 441nm, 443nm and 445nm.

[0258] Reference Figure 4The aperture stop 70 of the optical lens 1 can be disposed on the object side of the first lens group 10. In other embodiments, the aperture stop 70 can be disposed between the first lens group 10 and the first prism 20, or between the first prism 20 and the second lens group 30, or between the second lens group 30 and the second prism 60. This application does not limit this to any particular embodiment.

[0259] This application provides a possible design for an optical lens 1:

[0260] Reference Figure 4 and Figure 5 The optical lens 1 may include an aperture stop 70, a first lens group 10, a first prism 20, a second lens group 30, a folding element 40, a third lens group 50, and a second prism 60 arranged sequentially from the object side to the image side. The first lens group 10 has positive optical power, while the second and third lens groups 30 and 50 have negative optical power. The first lens group 10 includes one lens, the second lens group 30 includes three lenses, and the third lens group 50 includes two lenses. The first and second lens groups 10 and 30 form a focusing lens group. When the object distance to the target varies from infinity to greater than 0.5m, the optical lens 1 can move the first lens group 10 along the X-axis direction shown in the figure to achieve focusing. When the target distance varies within a range of less than or equal to 0.5m, the optical lens 1 can move the second lens group 30 along the first direction shown in the figure to achieve focusing. The folding element 40 is a prism. The light output direction of the second prism 60 is parallel to the X-axis direction shown in the figure, and the light output direction of the second prism 60 is opposite to the light input direction of the optical lens 1. The second included angle β of the first prism 20 is equal to the first included angle α of the second prism 60, and 22° < α = β < 28°. The first included angle α and the refractive index n1 of the second prism 60 satisfy: n1 ≥ 1 / sin(2α), and the second included angle β and the refractive index n2 of the first prism 20 satisfy: n2 ≥ 1 / sin(2β). For example, Figure 5 The optical lens 1 shown can have a dimension of 41.5 mm along the Y-axis, where, Figure 5 The optical lens 1 shown in (a) can have a dimension of 9.05 mm along the X-axis. Figure 5 (b) and Figure 5 The optical lens 1 shown in (c) can have a dimension of 12.05 mm along the X-axis, where, Figure 5 (b) and Figure 5 The optical lens 1 shown in (c) is... Figure 5 The size difference between the optical lenses 1 shown in (a) can come from the positional variation of the first lens group 10.

[0261] This application provides a camera module 300, which includes an image sensor 2 and an optical lens 1 as described in any of the above embodiments. The optical lens 1 is used to image the scene on the object side onto the image sensor 2. Since the overall size of the optical lens 1 in any of the above embodiments is small, the camera module 300 including this optical lens 1 is small in size and occupies less space in the electronic device 1000, which is beneficial to the miniaturization and thinning of the electronic device 1000. In addition, the optical lens 1 in any of the above embodiments has high focusing accuracy, which can make distant objects appear clearer in the image, which is beneficial to improving the imaging quality of the camera module 300, and thus improving the imaging quality of the electronic device 1000.

[0262] Reference Figure 4 In this embodiment of the application, the surface of the image sensor 2 of the camera module 300 used to receive light (this surface is typically the surface with the largest area of ​​the image sensor 2) is parallel to... Figure 4 The X-axis direction is set as shown, so that the thickness direction of the image sensor 2 is consistent with the thickness direction of the electronic device 1000. This can reduce the space occupied by the image sensor 2 in the thickness direction of the electronic device 1000, which is conducive to the miniaturization and thinning of the electronic device 1000.

[0263] This application provides an electronic device 1000, which includes an image processor and a camera module 300 as described in any of the above embodiments. The camera module 300 is used to acquire image data and input the image data into the image processor, which then processes the image data. Because the camera module 300 in any of the above embodiments is small in size and occupies little space within the electronic device 1000, the volume of the electronic device 1000 can be reduced, achieving miniaturization and thinning. Furthermore, the camera module 300 in any of the above embodiments has high imaging quality, therefore the electronic device 1000 containing this camera module 300 has high imaging quality.

[0264] In this embodiment, when the electronic device 1000 is used to take a picture, when the object distance of the target is affected, the first lens group 10 and the second lens group 30 can be moved to achieve focusing of the optical lens 1. The first lens group 10 and the second lens group 30 can move alternately or simultaneously. Setting up two focusing lens groups can reduce the focusing distance of a single lens group, which is beneficial to improving the movement accuracy of the lens group and the focusing accuracy of the optical lens 1, so that the electronic device 1000 can capture a clear image. The first lens group 10, which has positive optical power, and the second lens group 30, which has negative optical power, are used together, and the light... The light first passes through the first lens group 10 and then through the second lens group 30, which can reduce the size and weight of the optical lens 1 and increase the telephoto ratio of the optical lens 1. This is beneficial for the miniaturization and thinning design of the electronic device 1000, thereby improving the shooting flexibility and image quality of the electronic device 1000. In addition, the light undergoes at least two reflections in the first prism 20, which is equivalent to increasing the distance between the first lens group 10 and the second lens group 30 in the optical path. This can further increase the telephoto ratio of the optical lens 1, further improving the shooting flexibility and image quality of the electronic device 1000.

[0265] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical lens, characterized in that, Including those arranged sequentially from the object side to the image side: The first lens group (10) has positive optical power and is a focusing lens group. The first lens group (10) is used to receive light entering the optical lens (1). The first prism (20) is used to reflect light from the first mirror group (10) at least twice; The second lens group (30) has negative optical power and is a focusing lens group. The second lens group (30) is used to receive light emitted from the first prism (20). The optical lens (1) can selectively move at least one of the first lens group (10) and the second lens group (30) to achieve optical focusing of the optical lens (1).

2. The optical lens according to claim 1, characterized in that, When the distance to the target is greater than a preset value, one of the first lens group (10) and the second lens group (30) moves along the optical axis of the lens group to perform optical focusing; When the distance to the target is less than or equal to the preset value, the other lens group in the first lens group (10) and the second lens group (30) moves along the optical axis of the lens group to perform optical focusing.

3. The optical lens according to claim 2, characterized in that, When the distance to the target being photographed is greater than a preset value and the distance to the target being photographed gradually decreases, the first lens group (10) moves toward the object side of the optical lens (1). When the object distance of the target being photographed is less than or equal to a preset value, and the object distance of the target being photographed gradually decreases, the second lens group (30) moves toward the image side of the optical lens (1).

4. The optical lens according to any one of claims 1-3, characterized in that, The first lens group (10) moves in a direction parallel to the light incident direction of the optical lens (1), and the second lens group (30) moves in a direction that is tilted relative to the light incident direction of the optical lens (1).

5. The optical lens according to any one of claims 1-4, characterized in that, When shooting at a distance, the focal length of the optical lens (1) is M1, and when shooting at close range, the focal length of the optical lens (1) is M2. The optical lens (1) satisfies the following relationship: 0.8≤M1 / M2≤1.

2.

6. The optical lens according to any one of claims 1-5, characterized in that, The optical lens (1) further includes a second prism (60), which is located on the image side of the second mirror group (30) and is used to reflect light from the second mirror group (30).

7. The optical lens according to claim 6, characterized in that, The light-emitting direction of the second prism (60) is parallel to the light-incident direction of the optical lens (1).

8. The optical lens according to claim 7, characterized in that, The light-emitting direction of the second prism (60) is opposite to the light-incident direction of the optical lens (1).

9. The optical lens according to any one of claims 6-8, characterized in that, The optical lens (1) further includes a folding element (40). Along the optical axis of the optical lens (1), the folding element (40) is located between the first prism (20) and the second prism (60), and the folding element (40) is located on the object side or image side of the second mirror group (30). The folding element (40) includes a reflecting surface (41), which is used to reflect light to the second prism (60).

10. The optical lens according to claim 9, characterized in that, The folding element (40) is connected to the first prism (20); or, the folding element (40) is connected to the second prism (60).

11. The optical lens according to any one of claims 6-10, characterized in that, The second prism (60) includes a first side surface (61), a second side surface (62), and a third side surface (63). A first angle is formed between the second side surface (62) and the third side surface (63), which is less than 45°. Light rays entering the second prism (60) from the first side surface (61) are reflected sequentially by the third side surface (63) and the second side surface (62) and exit from the third side surface (63).

12. The optical lens according to claim 11, characterized in that, The first included angle α and the refractive index n1 of the second prism (60) satisfy: n1≥1 / sin(2α).

13. The optical lens according to any one of claims 1-12, characterized in that, The first prism (20) includes a fourth side surface (21), a fifth side surface (22) and a sixth side surface (23). The fourth side surface (21) and the fifth side surface (22) form a second angle, which is less than 45°. Light rays entering the first prism (20) from the fourth side surface (21) are reflected by the fifth side surface (22) and the fourth side surface (21) in sequence and exit from the sixth side surface (23).

14. The optical lens according to claim 13, characterized in that, The second included angle β and the refractive index n2 of the first prism (20) satisfy: n2≥1 / sin(2β).

15. The optical lens according to any one of claims 1-14, characterized in that, The optical lens (1) further includes a third lens group (50), which has negative optical power. The third lens group (50) is located on the image side of the first prism (20) and on the object side or image side of the second lens group (30).

16. The optical lens according to any one of claims 1-15, characterized in that, The combined focal length of the first lens group (10) is F1, and the combined focal length of the optical lens (1) is M. The optical lens (1) satisfies the following relationship: 0.5≤F1 / M≤1.

5.

17. The optical lens according to claim 16, characterized in that, The combined focal length of the second lens group (30) is F2, and the optical lens (1) satisfies the following relationship: |F2 / M|≥1.

1.

18. The optical lens according to any one of claims 1-17, characterized in that, Each of the first lens group (10) and the second lens group (30) has a first focal length F11 about light with wavelength λ1, a second focal length F12 about light with wavelength λ2, and a third focal length F13 about light with wavelength λ3, wherein λ1 is 650nm, λ2 is 550nm, and λ3 is 435nm. The optical lens (1) satisfies the following relationship: 0.99≤F11 / F12≤1.01; 0.99≤F13 / F12≤1.

01.

19. A camera module, characterized in that, It includes an image sensor (2) and an optical lens (1) according to any one of claims 1-18, the optical lens (1) being used to image an object-side scene onto the image sensor (2).

20. An electronic device, characterized in that, It includes an image processor and a camera module (300) as described in claim 19, the camera module (300) being used to acquire image data and input the image data into the image processor, the image processor being used to process the image data.

Images