Camera module and electronic equipment

Abstract

The invention discloses a camera module and electronic equipment, and belongs to the technical field of optics. The camera module comprises a lens group, a reflector and a photosensitive element, the lens group is located on the light-in side of the reflector, the photosensitive element is located on the light-out side of the reflector, the lens group and the reflector are sequentially arranged in the optical axis direction of the lens group, the reflector is provided with an incident plane, at least one reflecting plane and a light-out plane, and the light-out plane is located on the incident plane. The focal power of the light-emitting surface is greater than zero, and the light penetrating through the lens group enters through the incident surface, is reflected by the reflecting surface, is bent by the light-emitting surface, and then exits to the photosensitive element.

Description

Technical Field

[0001] This application belongs to the field of optical technology, and particularly relates to an imaging module and an electronic device. Background Art

[0002] With the increasing popularity of electronic devices such as mobile phones in daily life, consumers' requirements for the imaging and photographing functions of electronic devices are also getting higher and higher. To obtain a better shooting experience and achieve a longer shooting distance, increasing the focal length is an important development direction of the imaging module.

[0003] In related technologies, the imaging module includes a lens group and a reflecting prism. External light is transmitted through the lens group and reflected by the reflecting prism for imaging. The lens group is used to receive light and correct aberrations. However, the correction effect of the lens group on aberrations is limited, resulting in a low correction efficiency of the imaging module for aberrations and poor imaging quality. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide an imaging module and an electronic device, which can solve the problems of low aberration correction efficiency and poor imaging quality of the imaging module in related technologies.

[0005] In a first aspect, the embodiments of this application provide an imaging module, including a lens group, a reflecting mirror, and a photosensitive element. The lens group is located on the incident light side of the reflecting mirror, and the photosensitive element is located on the outgoing light side of the reflecting mirror. The lens group and the reflecting mirror are arranged in sequence along the optical axis direction of the lens group. The reflecting mirror is provided with an incident surface, at least one reflecting surface, and an outgoing light surface, and the optical power of the outgoing light surface is greater than zero. The light passing through the lens group is incident through the incident surface, reflected by the reflecting surface, and bent by the outgoing light surface and then exits to the photosensitive element.

[0006] In a second aspect, the embodiments of this application further provide an electronic device, including a device housing and the above-mentioned imaging module, and the imaging module is arranged in the device housing.

[0007] In the embodiments of this application, the reflecting mirror of the imaging module is provided with an outgoing light surface with an optical power greater than zero. The optical power characterizes the refracting ability of the reflecting mirror to light. That is to say, the reflecting mirror not only has a reflecting function but also has a function of deflecting light. Therefore, on the basis of the lens group correcting aberrations, the outgoing light surface of the reflecting mirror can also correct aberrations, thereby balancing the overall aberrations of the imaging module, which is beneficial to improving the correction efficiency, enhancing the correction effect, and improving the imaging quality. Description of the Drawings

[0008] Figure 1 is a schematic structural diagram of the imaging module disclosed in the first embodiment of this application; Figure 2It is a schematic structural diagram of the camera module disclosed in the second embodiment of the present application; Figure 3 It is a schematic structural diagram of the camera module disclosed in the third embodiment of the present application; Figure 4 It is a schematic structural diagram of the camera module disclosed in the fourth embodiment of the present application; Figure 5 It is a coordinate schematic diagram of the longitudinal spherical aberration generated by the camera module in the first embodiment of the present application; Figure 6 It is a coordinate schematic diagram of the optical distortion generated by the camera module in the first embodiment of the present application; Figure 7 It is a coordinate schematic diagram of the longitudinal spherical aberration generated by the camera module in the second embodiment of the present application; Figure 8 It is a coordinate schematic diagram of the optical distortion generated by the camera module in the second embodiment of the present application; Figure 9 It is a coordinate schematic diagram of the longitudinal spherical aberration generated by the camera module in the third embodiment of the present application; Figure 10 It is a coordinate schematic diagram of the optical distortion generated by the camera module in the third embodiment of the present application.

[0009] Explanation of reference numerals: 100 - lens group, 110 - first lens, 120 - second lens, 130 - third lens, 200 - mirror, 210 - light - emitting surface, 220 - incident surface, 230 - reflecting surface, 231 - first reflecting surface, 232 - second reflecting surface, 233 - third reflecting surface, S - outgoing optical axis, 300 - photosensitive element, 400 - filter. Detailed implementation manners

[0010] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0011] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data used can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0012] The following will combine the accompanying drawings to detail the camera module and electronic device provided by the embodiments of this application through specific embodiments and their application scenarios.

[0013] Please refer to Figures 1 - 10 , the camera module disclosed in the embodiments of this application is applied to an electronic device. The camera module includes a lens group 100, a mirror 200, and an image sensor 300. Among them, the lens group 100 allows light to pass through, and is used to adjust the focal length, control the propagation direction and convergence degree of light, and improve the imaging quality; the mirror 200 is used to reflect the light passing through the lens group 100 and change the outgoing direction of the light; the image sensor 300 receives the light emitted by the mirror 200 and performs imaging.

[0014] Refer to Figures 1 - 4 As shown, the lens group 100 is located on the incident light side of the mirror 200, and the image sensor 300 is located on the outgoing light side of the mirror 200. Moreover, the lens group 100 and the mirror 200 are arranged in sequence along the optical axis direction of the lens group 100. In this way, the external light passes through the lens group 100 and then smoothly enters the mirror 200, and after being reflected by the mirror 200, it is smoothly projected onto the image sensor 300.

[0015] The mirror 200 can be a reflecting prism or other types of mirrors 200. The embodiments of this application do not limit the specific structure and type of the mirror 200. The mirror 200 is provided with an incident surface 220, at least one reflecting surface 230, and an outgoing surface 210. The outgoing surface 210 faces the image sensor 300, and moreover, the optical power of the outgoing surface 210 is greater than zero. The optical power characterizes the refractive ability of the mirror 200 to light. That is to say, the light passing through the outgoing surface 210 will be deflected. Then, the light passing through the lens group 100 is incident through the incident surface 220, reflected by the reflecting surface 230, and bent by the outgoing surface 210 and then exits to the image sensor 300. The embodiments of this application do not limit the structure and shape of the outgoing surface 210, as long as it can ensure that its optical power is greater than zero.

[0016] In the embodiment of the present application, the mirror 200 of the camera module is provided with an outgoing surface 210 having a positive optical power. Therefore, the mirror 200 not only has a reflection function but also has a function of deflecting light rays. On the basis that the lens group 100 corrects aberrations, the outgoing surface 210 of the mirror 200 can also correct aberrations, thereby balancing the overall aberrations of the camera module, which is beneficial to improving the correction efficiency, enhancing the correction effect, and improving the imaging quality.

[0017] In addition, the lens group 100 can appropriately shorten the size along its optical axis direction, reduce the height by which the lens group 100 protrudes relative to the mirror 200, and reduce the optical path of the lens group 100. In this way, the optical path of the camera module is shortened. Although it has a certain impact on the optical performance of the camera module, the outgoing surface 210 of the mirror 200 has the effect of adjusting aberrations, and the mirror 200 helps to improve the optical performance of the camera module. Therefore, the combination of the lens group 100 and the mirror 200 can reduce the height by which the lens group 100 protrudes relative to the mirror 200 on the premise of ensuring the optical performance of the camera module. In the solution of the present application, the optical power of the camera module is φ, and the optical power of the outgoing surface 210 is φ1. The optical power φ of the camera module and the optical power φ1 of the outgoing surface 210 satisfy: 1.25 ≤ φ1 / φ ≤ 5.

[0018] That is to say, the optical power φ1 of the outgoing surface 210 is greater than the optical power φ of the camera module, indicating that the optical power φ1 of the outgoing surface 210 is relatively large and the ability to deflect light rays is relatively strong. In the entire camera module, the outgoing surface 210 plays a leading role in deflecting light rays, which is beneficial to the faster convergence of light rays to the focal point position. Moreover, it is beneficial to compensate for the aberrations generated by other components of the camera module, and is more beneficial to balancing the aberrations of the camera module and improving the imaging quality.

[0019] In a further embodiment, the optical power φ of the camera module and the optical power φ1 of the outgoing surface 210 satisfy: 1.44 ≤ φ1 / φ ≤ 4.72.

[0020] The magnitude of the optical power has an important impact on the imaging performance of the camera module. With such a setting, the optical power of the outgoing surface 210 is within a suitable range, avoiding the optical power of the outgoing surface 210 being too large or too small, avoiding insufficient deflection of light rays when the optical power of the outgoing surface 210 is small, and thus avoiding blurred imaging, and also avoiding excessive deflection of light rays when the optical power of the outgoing surface 210 is large, and thus avoiding serious aberrations.

[0021] Of course, in other embodiments, the optical power φ of the camera module and the optical power φ1 of the outgoing surface 210 satisfy: φ1 / φ < 1.25 or φ1 / φ > 5.

[0022] In the solution of this application, the optical power of the camera module is φ, and the optical power of the lens group 100 is φ2. The optical power φ of the camera module and the optical power φ2 of the lens group 100 satisfy: |φ2 / φ - 1| ≤ 0.1.

[0023] Specifically, it can be φ2 - φ ≤ 0.1. In this case, the optical power φ2 of the lens group 100 is greater than the optical power φ of the camera module; it can also be φ - φ2 ≤ 0.1. In this case, the optical power φ2 of the lens group 100 is less than the optical power φ of the camera module. In short, the optical power φ2 of the lens group 100 is close to the optical power φ of the camera module, and the difference between the two is small.

[0024] Since the reflector 200 is provided with an outgoing light surface 210 with a positive optical power, the reflector 200 affects the optical power φ of the camera module. To ensure that the camera module can stably generate high-quality images, it is necessary to concentrate the main contribution of the optical power on the lens group 100. Therefore, by designing and manufacturing the lens group 100, the difference between the optical power φ of the camera module and the optical power φ2 of the lens group 100 is made small, which is beneficial to better control the imaging process and keep the optical power φ of the camera module within a relatively stable range that meets the design requirements. In a further embodiment, the relationship between the optical power φ of the camera module and the optical power φ2 of the lens group 100 is: 0.94 ≤ φ2 / φ ≤ 1.05. That is to say, at this time, -0.06 ≤ φ2 / φ - 1 ≤ 0.05, and the difference between the optical power φ2 of the lens group 100 and the optical power φ of the camera module is further reduced.

[0025] With such a setting, the difference between the optical power φ of the camera module and the optical power φ2 of the lens group 100 is further reduced, which is more beneficial to better control the imaging process through the lens group 100 and keep the optical power φ of the camera module within a relatively stable range that meets the design requirements.

[0026] Of course, in other embodiments, the optical power φ of the camera module and the optical power φ2 of the lens group 100 satisfy: |φ2 / φ - 1| > 0.1, that is, the difference between the optical power φ2 of the lens group 100 and the optical power φ of the camera module is large.

[0027] In this embodiment, the optical power φ of the camera module, the optical power φ1 of the outgoing light surface 210, and the optical power φ2 of the lens group 100 respectively satisfy the above relationships, that is, 1.44 ≤ φ1 / φ ≤ 4.72, and 0.94 ≤ φ2 / φ ≤ 1.05.

[0028] In the solution of this application, the reflector 200 is provided with at least two reflecting surfaces 230 so that the number of times the light is reflected in the reflector 200 is at least two. Optionally, refer to Figures 1 - 3As shown, the number of reflecting surfaces 230 is at least two, including a first reflecting surface 231 and a second reflecting surface 232. After the light is incident through the incident surface 220, it is reflected by the first reflecting surface 231 and the second reflecting surface 232 in sequence, and the number of reflections of the light within the mirror 200 is at least two. The first reflecting surface 231 is inclined with respect to the incident surface 220 of the mirror 200, so that the light incident on the incident surface 220 can reach the first reflecting surface 231. Moreover, the second reflecting surface 232 is inclined with respect to the first reflecting surface 231, or the first reflecting surface 231 and the second reflecting surface 232 are directly opposite to each other, so that the light reflected by the first reflecting surface 231 can reach the second reflecting surface 232. Further optionally, the reflecting surface 230 may further include a third reflecting surface 233. The second reflecting surface 232 and the third reflecting surface 233 are opposite to each other, and the first reflecting surface 231 is located between the third reflecting surface 233 and the second reflecting surface 232. The light incident through the incident surface 220 is reflected by the first reflecting surface 231, the second reflecting surface 232, and the third reflecting surface 233 in sequence, so that the number of reflections of the light within the mirror 200 is at least three.

[0029] Specifically, the same reflecting surface 230 can reflect the light at least once. Optionally, as shown in Figure 3 the first reflecting surface 231, the second reflecting surface 232, and the third reflecting surface 233 each reflect the light once, and at this time the number of reflections of the light within the mirror 200 is three; or, as shown in Figure 2 the first reflecting surface 231 and the third reflecting surface 233 each reflect the light once, and the second reflecting surface 232 reflects the light twice, and at this time the number of reflections of the light within the mirror 200 is four; or, as shown in Figure 1 the first reflecting surface 231 reflects the light once, the second reflecting surface 232 reflects the light three times, and the third reflecting surface 233 reflects the light twice, and at this time the number of reflections of the light within the mirror 200 is five. Of course, by increasing the areas of the second reflecting surface 232 and the third reflecting surface 233, the second reflecting surface 232 and the third reflecting surface 233 can reflect the light more times.

[0030] Of course, the mirror 200 may also be provided with a fourth reflecting surface or the like to increase the number of reflections of the light within the mirror 200. With this embodiment, by providing at least two reflecting surfaces 230 on the reflector 200, light can be reflected multiple times within the reflector 200, extending the optical path within a limited space, which is beneficial for achieving the effect of a long focal length lens, improving the optical performance without increasing the device volume, and enhancing the flexibility and diversity of shooting. Moreover, a larger number of reflections means that there are more changes in the propagation paths of light within the reflector 200, providing more opportunities for aberration correction. By reasonably designing the shape and position of the reflector 200 to cooperate with the lens group 100, more precise aberration correction can be achieved, which is conducive to further improving the imaging quality.

[0031] Of course, in other embodiments, referring to Figure 4 as shown, the reflector 200 is provided with only the first reflecting surface 231, and the first reflecting surface 231 reflects light once, so the number of reflections of light within the reflector 200 is one.

[0032] In a further embodiment, the incident surface 220 and the second reflecting surface 232 can be coplanar, that is to say, the incident surface 220 and the second reflecting surface 232 are the same surface. Referring to Figures 1 - 3 as shown, the surface of the reflector 200 facing the lens group 100 can be used both for light incidence and for light reflection.

[0033] With this embodiment, the incident surface 220 and the second reflecting surface 232 being coplanar is beneficial for precisely guiding and converging light, enabling light to propagate along a preset path, ensuring that the photosensitive element 300 accurately receives light, and improving the imaging accuracy. Moreover, it can reduce the aberration generated by light incident and reflected on different surfaces to a certain extent, which is beneficial for improving the imaging quality and also for making the structure of the reflector 200 more compact.

[0034] Of course, in other embodiments, the incident surface 220 and the second reflecting surface 232 can be non - coplanar, and the incident surface 220 and the second reflecting surface 232 are separate surfaces respectively.

[0035] In an alternative embodiment, referring to Figures 1 - 4 as shown, the partial optical axis of the reflector 200 from which light exits to the photosensitive element 300 is the exit optical axis S, and the tangent at the intersection of the exit optical axis S and the exit surface 210 is the first tangent, and the first tangent is perpendicular to the exit optical axis.

[0036] With this embodiment, the tangent at the intersection of the exit surface 210 and the exit optical axis S is perpendicular to the exit optical axis S. This perpendicular relationship helps to maintain the symmetry and regularity of light, enabling light to be more evenly distributed and propagated after reflection, reducing the aberration generated by uneven light reflection, and being beneficial for improving the imaging clarity and enhancing the imaging quality.

[0037] Of course, in other embodiments, the first tangent line may intersect the outgoing optical axis S but not perpendicularly.

[0038] In an alternative embodiment, the light-emitting surface 210 has an aspherical structure.

[0039] By adopting this embodiment, the structure of the light-emitting surface 210 can be precisely adjusted according to the optical design requirements, so that the light can be more evenly converged or diverged when passing through the aspherical structure, thereby effectively reducing aberration and improving the imaging quality. Therefore, the aspherical structure is more conducive to correcting aberration.

[0040] Of course, in other embodiments, the light-emitting surface 210 may also have a spherical structure.

[0041] In the solution of the present application, as shown in Figures 1 - 4 , the lens group 100 includes at least two lenses, including a first lens 110 and a second lens 120. The first lens 110 and the second lens 120 are arranged in sequence along the optical axis direction of the lens group 100. Of course, the lens group 100 may further include a third lens 130, and the first lens 110, the second lens 120, and the third lens 130 are arranged in sequence along the optical axis direction of the lens group 100. The lens group 100 can move relative to the mirror 200 along its own optical axis direction. When the imaging module switches from photographing an object at a relatively far distance to photographing an object at a relatively close distance, the whole of the lens group 100 moves in a direction away from the mirror 200 to achieve autofocus.

[0042] In an alternative embodiment, the optical power of one of the first lens 110 and the second lens 120 is greater than zero, and the optical power of the other is less than zero. Specifically, the optical power of the first lens 110 is greater than zero, and the optical power of the second lens 120 is less than zero. The first lens 110 may be a convex lens, and the second lens 120 may be a concave lens; alternatively, the optical power of the first lens 110 is less than zero, and the optical power of the second lens 120 is greater than zero. The first lens 110 may be a concave lens, and the second lens 120 may be a convex lens.

[0043] A positive optical power lens converges light rays, causing a greater degree of deflection of marginal rays, while a negative optical power lens diverges light rays, causing a greater degree of divergence of marginal rays. With such a setting, by using a positive optical power lens and a negative optical power lens and reasonably designing the parameters of the two lenses (such as the radius of curvature, material refractive index, etc.), the spherical aberration generated by the first lens 110 can be appropriately corrected by the second lens 120, effectively correcting and compensating for spherical aberration, further reducing aberration, and improving the imaging quality.

[0044] Of course, in other embodiments, the optical powers of both the first lens 110 and the second lens 120 may be greater than or less than zero.

[0045] In a further embodiment, the difference between the Abbe number of one of the first lens 110 and the second lens 120 and the Abbe number of the other is greater than 20. That is to say, the difference between the Abbe number of the first lens 110 and the Abbe number of the second lens 120 is relatively large. It can be that the Abbe number of the first lens 110 is larger and the Abbe number of the second lens 120 is smaller, or it can be that the Abbe number of the first lens 110 is smaller and the Abbe number of the second lens 120 is larger.

[0046] Optionally, the Abbe number of one of the first lens 110 and the second lens 120 is greater than 50, and the Abbe number of the other is less than 30. Specifically, it can be that the Abbe number of the first lens 110 is greater than 50 and the Abbe number of the second lens 120 is less than 30; or the Abbe number of the first lens 110 is less than 30 and the Abbe number of the second lens 120 is greater than 50. In short, the difference between the Abbe numbers of the first lens 110 and the second lens 120 is at least 20, and the difference between their Abbe numbers is relatively large.

[0047] Further optionally, the material of the first lens 110 can be cycloolefin polymer, the material of the second lens 120 can be resin, the Abbe number of the first lens 110 is 56, and the Abbe number of the second lens 120 is 26. Of course, other materials can be selected for the first lens 110 and the second lens 120, and the Abbe numbers of the first lens 110 and the second lens 120 can be other values.

[0048] The Abbe number is an index to measure the degree of dispersion of a material. The smaller the Abbe number, the stronger the dispersion; the larger the Abbe number, the weaker the dispersion. When light first passes through the first lens 110 with a smaller Abbe number, due to its stronger dispersion, light of different wavelengths will be dispersed and separated to a greater extent. Then the light passes through the second lens 120 with a larger Abbe number, whose dispersion is weaker, and it will perform reverse refraction adjustment on the light of different wavelengths that have been dispersed and separated, making the light of different wavelengths converge closer together, thereby compensating for the previously generated dispersion and reducing the chromatic aberration of the camera module. Similarly, when light passes through a lens with a larger Abbe number first and then through a lens with a smaller Abbe number, the purpose of correcting chromatic aberration can also be achieved.

[0049] Adopting this embodiment, the difference between the Abbe number of the first lens 110 and the Abbe number of the second lens 120 is relatively large, indicating that when the first lens 110 causes a large degree of dispersion separation of light of different wavelengths, the second lens 120 can perform reverse compensation, thereby reducing the chromatic aberration of the entire camera module, further reducing the aberration, and improving the imaging quality.

[0050] Of course, in other embodiments, the Abbe number of one of the first lens 110 and the second lens 120 can be less than 50, and the Abbe number of the other can be greater than 30, such that the difference between the Abbe number of the first lens 110 and the Abbe number of the second lens 120 is less than 20.

[0051] In the solution of the present application, reference is made to Figures 1 - 4 As shown, the camera module further includes a filter 400, and the filter 400 is located between the light-emitting surface 210 and the photosensitive element 300. With such an arrangement, after the light is reflected by the mirror 200, it passes through the filter 400 for filtering and then reaches the photosensitive element 300. The filter 400 can filter out stray light, selectively transmit light in a specific direction or within a specific wavelength range, and improve the signal-to-noise ratio and imaging quality of the camera module.

[0052] In a further embodiment, the filter 400 is provided with a coating, and the coating includes at least one of an antireflection film and an infrared cut-off film. Optionally, the filter 400 can be provided with only an antireflection film, or only an infrared cut-off film, or by providing both an antireflection film and an infrared cut-off film. The present application embodiment does not limit whether the coated layer is on the surface of the filter 400 facing the mirror 200 or the surface facing away from the mirror 200.

[0053] With such an arrangement, the filter 400 is coated with an antireflection film, which is beneficial to improving the light transmittance, improving the imaging quality, and broadening the spectral response range; the infrared cut-off film blocks infrared light, ensures that visible light passes through smoothly, and is beneficial to improving the image clarity and color accuracy.

[0054] Of course, in other embodiments, the filter 400 can be provided without an antireflection film and an infrared cut-off film, and the light passing through the mirror 200 only passes through the filter 400 and then reaches the photosensitive element 300.

[0055] For the above solution, the present application details the beneficial effects through the following three embodiments and in combination with relevant data.

[0056] In an alternative solution, reference is made to Figure 1 As shown, the lens group 100 includes a first lens 110, a second lens 120, and a third lens 130. The first lens 110, the second lens 120, and the third lens 130 are all aspherical structures. The optical power of the first lens 110 is greater than 0, the optical power of the second lens 120 is less than 0, and the number of reflections of the light in the mirror 200 is five.

[0057] Please refer to the data in Table I for characterizing the optical properties of the camera module: Table I

[0058] Among them, f is the focal length of the camera module, F is the aperture of the camera module, DFOV is the field of view angle, f1 is the focal length of the lens group 100, f1 is the focal length of the mirror 200, V d1 is the Abbe number of the first lens 110, V d2 is the Abbe number of the second lens 120.

[0059] Please refer to the parameters of each lens, the mirror 200, the filter 400, and the image plane in Table 2: Table 2

[0060] Among them, s1 and s2 are the two surfaces of the first lens 110 facing away from each other along the optical axis, s3 and s4 are the two surfaces of the second lens 120 facing away from each other along the optical axis, s5 and s6 are the two surfaces of the third lens 130 facing away from each other along the optical axis, s7 represents the incident light surface of the mirror 200, s8 - s12 are the 5 reflecting surfaces of the mirror 200, enabling the mirror 200 to reflect light five times, s13 is the outgoing light surface 210 of the mirror 200, and the optical power of the outgoing light surface 210 is greater than 0, s14 and s15 are the two surfaces of the filter 400 facing away from each other along the optical axis of the mirror 200, and the image plane s16 is the imaging plane of the photosensitive element 300.

[0061] The surface type of each lens is an aspherical structure, and the expression formula of the aspherical surface is:

[0062] Among them, Z represents the sagittal height of a point on the aspherical surface relative to the reference plane (usually the plane where the vertex is located) along the optical axis, that is, the distance from a point on the aspherical surface to the reference plane; r is the radial distance from a point on the aspherical surface to the optical axis; c is the curvature of the aspherical surface at the vertex, that is, the reciprocal of the radius of curvature at the vertex; K is the conic coefficient, and A, B, C, D, E, F, G, H, etc. are all aspherical coefficients.

[0063] Please refer to the aspherical surfaces of the first lens 110, the aspherical surfaces of the second lens 120, the aspherical surfaces of the third lens 130, the conic coefficient of the outgoing light surface 210, and the aspherical coefficients shown in Table 3: Table 3

[0064] According to scientific notation, E represents multiplying by a certain power of 10. For example, the K value of S1 is -1.56 multiplied by 10 to the power of -1, that is, -0.156, and other coefficients are calculated in the same way. qizhonH is in the perpendicular direction Based on the above parameters, the schematic diagram of the aberration generated by the light passing through the camera module is shown in reference to Figure 5 and Figure 6 as shown, Figure 5 where the abscissa represents the offset of the focus position, with the unit of mm, reflecting the deviation between the actual focusing position of the light and the ideal focusing position, and the ordinate represents the longitudinal spherical aberration, with the unit of mm, describing the deviation of the focusing positions of lights with different wavelengths along the optical axis relative to the ideal focus position. FromFigure 5 It can be seen that the deviation between the light-gathering position and the focal position of the light is small, and the longitudinal spherical aberration is small; Figure 6 In the figure, the abscissa represents the percentage of distortion, which is used to measure the degree of distortion, with the unit of %, and the ordinate represents the image height, with the unit of mm, that is, the perpendicular distance from the image point on the imaging plane to the optical axis, reflecting the height information of the images corresponding to the points at different positions in the image. Figure 6 It can be seen that the percentage of distortion is small and the aberration is small.

[0065] In another alternative solution, refer to Figure 2 As shown, the number of reflections of the light within the mirror 200 is four.

[0066] Please refer to the data in Table IV for characterizing the optical properties of the camera module: Table IV

[0067] Among them, f is the focal length of the camera module, F is the aperture of the camera module, DFOV is the field of view angle, f1 is the focal length of the lens group 100, f1 is the focal length of the mirror 200, V d1 is the Abbe number of the first lens 110, V d2 is the Abbe number of the second lens 120.

[0068] Please refer to Table V for the respective parameters of each lens, the mirror 200, the filter 400, and the image plane of the camera module: Table V

[0069] Among them, s1 and s2 are the two surfaces of the first lens 110 facing away from each other along the optical axis, s3 and s4 are the two surfaces of the second lens 120 facing away from each other along the optical axis, s5 and s6 are the two surfaces of the third lens 130 facing away from each other along the optical axis, s7 represents the light-incident surface of the mirror 200, s8 - s11 are the 4 reflecting surfaces of the mirror 200, enabling the mirror 200 to reflect the light four times, s12 is the light-emitting surface 210 of the mirror 200, and the optical power of the light-emitting surface 210 is greater than 0, s13 and s14 are the two surfaces of the filter 400 facing away from each other along the optical axis of the mirror 200, and the image plane s15 is the imaging plane of the photosensitive element 300.

[0070] Based on the aspheric expression formula in the above text, please refer to Table VI for the aspheric coefficients and non-aspheric coefficients of each aspheric surface of the first lens 110, each aspheric surface of the second lens 120, each aspheric surface of the third lens 130, and the second-order surface of the light-emitting surface 210: Table VI

[0071] Based on the above parameters, according to Figure 7 the coordinate schematic diagram of the longitudinal spherical aberration generated by the light of the camera module shown, it can be seen that the deviation between the light focusing position and the focal point position is small, and the longitudinal spherical aberration is small; according to Figure 8 the coordinate schematic diagram of the light distortion degree shown, it can be seen that the distortion percentage is small and the aberration is small.

[0072] In another alternative solution, referring to Figure 3 shown, the number of reflections of the light in the mirror 200 is three times.

[0073] Please refer to the data of the camera module characterizing the optical properties in Table VII: Table VII

[0074] Among them, f is the focal length of the camera module, F is the aperture of the camera module, DFOV is the field of view angle, f1 is the focal length of the lens group 100, f1 is the focal length of the mirror 200, V d1 is the Abbe number of the first lens 110, V d2 is the Abbe number of the second lens 120.

[0075] Please refer to the parameters of each lens, the mirror 200, the filter 400 and the image plane of the camera module in Table VIII: Table VIII

[0076] Among them, s1 and s2 are the two surfaces of the first lens 110 facing away from each other along the optical axis direction, s3 and s4 are the two surfaces of the second lens 120 facing away from each other along the optical axis direction, s5 and s6 are the two surfaces of the third lens 130 facing away from each other along the optical axis direction, s7 represents the light incident surface of the mirror 200, s8 - s10 are the 3 reflection surfaces of the mirror 200, so that the mirror 200 reflects the light three times, s11 is the light exit surface 210 of the mirror 200, and the optical power of the light exit surface 210 is greater than 0, s12 and s13 are the two surfaces of the filter 400 facing away from each other along the optical axis direction of the mirror 200, and the image plane s14 is the imaging plane of the photosensitive element 300.

[0077] Based on the aspheric expression formula in the above text, please refer to Table IX showing the aspheric coefficients and non - aspheric coefficients of each aspheric surface of the first lens 110, each aspheric surface of the second lens 120, each aspheric surface of the third lens 130 and the light exit surface 210: Table IX

[0078] Based on the above parameters, according to Figure 9As can be seen from the coordinate schematic diagram of the longitudinal spherical aberration generated by the light of the imaging module shown, the deviation between the light focusing position and the focal position is small, and the longitudinal spherical aberration is small; according to Figure 10 As can be seen from the coordinate schematic diagram of the degree of light distortion shown, the percentage of distortion is small and the aberration is small.

[0079] Based on the imaging module disclosed in the present application, an embodiment of the present application further discloses an electronic device, which includes a device housing and the imaging module in the above embodiment, and the imaging module is disposed in the device housing. Optionally, the device housing is provided with an opening opposite to the imaging module, and external light enters the imaging module through the opening to enable the imaging module to take pictures.

[0080] In addition, the electronic device may further include electronic components such as a display screen, a battery, an image processor, etc. The image processor is communicatively connected to the photosensitive element 300, and the image processor is configured to perform image processing on the signals sensed by the photosensitive element 300.

[0081] By adopting this embodiment, the imaging module of the electronic device is specially designed, and the light-emitting surface 210 with a positive optical power is set for the reflector 200 therein. The reflector 200 not only has a reflection function but also has a function of deflecting light. On the basis of the lens group 100 correcting aberration, the light-emitting surface 210 of the reflector 200 can also correct aberration, thereby balancing the overall aberration of the imaging module, which is beneficial to improving the correction efficiency, enhancing the correction effect, and improving the imaging quality.

[0082] The electronic device disclosed in the embodiment of the present application may be a device such as a smart phone, a tablet computer, an e-book reader, a wearable device, an electronic game console, etc. The embodiment of the present application does not limit the specific type of the electronic device.

[0083] The embodiments of the present application have been described above with reference to the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the claims of the present application, and all of them belong to the protection scope of the present application.

Claims

1. An imaging module, characterized in that, It includes a lens group (100), a reflector (200), and a photosensitive element (300). The lens group (100) is located on the light incident side of the reflector (200), the photosensitive element (300) is located on the light exiting side of the reflector (200), and the lens group (100) and the reflector (200) are arranged in sequence along the optical axis direction of the lens group (100). The reflector (200) is provided with an incident surface (220), at least one reflecting surface (230), and an exiting surface (210), and the optical power of the exiting surface (210) is greater than zero. The light passing through the lens group (100) is incident through the incident surface (220), reflected by the reflecting surface (230), and refracted by the exiting surface (210) and then exits to the photosensitive element (300).

2. The camera module according to claim 1, wherein The optical power of the imaging module is φ, the optical power of the exiting surface (210) is φ1, and the optical power of the lens group (100) is φ2. The optical power φ of the imaging module and the optical power φ1 of the exiting surface (210) satisfy: 1.25 ≤ φ1 / φ ≤ 5; And / or, the optical power φ of the imaging module and the optical power φ2 of the lens group (100) satisfy: |φ2 / φ - 1| ≤ 0.

1.

3. The camera module according to claim 1, wherein The reflector (200) is provided with at least two reflecting surfaces (230) so that the number of reflections of the light within the reflector (200) is at least two times.

4. The imaging module according to claim 3, wherein The reflecting surface (230) includes a first reflecting surface (231) and a second reflecting surface (232). The light is incident through the incident surface (220) and is reflected by the first reflecting surface (231) and the second reflecting surface (232) in sequence, and the incident surface (220) and the second reflecting surface (232) are coplanar.

5. The imaging module according to claim 1, wherein The partial optical axis of the reflector (200) that exits to the photosensitive element (300) from the reflecting surface (230) is the exiting optical axis (S). The tangent at the intersection of the exiting optical axis (S) and the exiting surface (210) is the first tangent, and the first tangent is perpendicular to the exiting optical axis (S).

6. The camera module according to claim 1, wherein The exiting surface (210) is an aspherical structure.

7. The camera module according to claim 1, wherein, The lens group (100) includes at least two lenses, including a first lens (110) and a second lens (120). The first lens (110) and the second lens (120) are arranged in sequence along the optical axis direction of the lens group (100). The optical power of one of the first lens (110) and the second lens (120) is greater than zero, and the optical power of the other is less than zero.

8. The camera module according to claim 7, wherein The difference between the Abbe number of one of the first lens (110) and the second lens (120) and the Abbe number of the other is greater than 20.

9. The camera module according to claim 1, wherein The imaging module further includes a filter (400). The filter (400) is located between the exiting surface (210) and the photosensitive element (300), and the filter (400) is provided with a coating, and the coating includes at least one of an antireflection film and an infrared cut-off film.

10. An electronic device, characterized in that, It includes a device housing and the camera module according to any one of claims 1-9, and the camera module is disposed in the device housing.

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