Camera module and electronic equipment

Abstract

The invention discloses a camera module and electronic equipment, and belongs to the technical field of electronic equipment. The camera module comprises an objective lens, a prism assembly and a photosensitive component, the prism assembly is arranged on the light emitting side of the objective lens and comprises a first prism and a second prism, the distance between the first prism and the objective lens is smaller than that between the first prism and the second prism, and the first prism and / or the second prism comprises at least one free-form surface. The photosensitive part is located on the side, away from the objective lens, of the prism assembly, and light emitted by the objective lens is transmitted to the photosensitive part after being reflected by the prism assembly multiple times. When the light is transmitted in the prism assembly, the light passes through the free-form surface, and the focal power of the prism assembly is larger than that of the objective lens.

Description

Technical Field

[0001] This application belongs to the field of electronic equipment technology, specifically relating to a camera module and an electronic device. Background Technology

[0002] In related technologies, as smartphones increasingly demand ultra-thin designs and high-definition telephoto photography, the height of in-line lens modules increases significantly to achieve longer focal lengths, resulting in severe camera protrusion that cannot be accommodated in the slim and lightweight body of the phone. Adding a prism to the camera module allows light to be folded along its path, reducing its physical size.

[0003] The light path is folded by multiple reflections inside the prism, which compresses the physical size of the super telephoto system to ensure the ultra-thin design of the phone. However, because the light is folded multiple times by the prism, it will result in large imaging aberrations, affecting the image quality. Summary of the Invention

[0004] This application aims to provide a camera module and electronic device that can solve the problem that multiple foldings of light through a prism can lead to large imaging aberrations and affect image quality.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, the technical solution of this application proposes a camera module, including an objective lens, a prism assembly, and a photosensitive component. The prism assembly is disposed on the light-emitting side of the objective lens. The prism assembly includes a first prism and a second prism. The distance between the first prism and the objective lens is less than the distance between the first prism and the second prism. The first prism and / or the second prism includes at least one freeform surface. The photosensitive component is located on the side of the prism assembly away from the objective lens. The light emitted from the objective lens is transmitted to the photosensitive component after multiple reflections by the prism assembly. When the light is transmitted within the prism assembly, the light passes through the freeform surface, and the optical power of the prism assembly is greater than the optical power of the objective lens.

[0007] The camera module provided in this application includes an objective lens, a prism assembly, and a photosensitive component. The prism assembly is disposed on the light-emitting side of the objective lens. The prism assembly includes a first prism and a second prism. The distance between the first prism and the objective lens is less than the distance between the first prism and the second prism. The first prism and / or the second prism includes at least one freeform surface. The photosensitive component is located on the side of the prism assembly away from the objective lens. Multiple reflections inside the prism assembly can be used to achieve light path folding, thereby compressing the physical size of the ultra-telephoto system and realizing a lightweight design of the system volume. Because the light emitted from the objective lens is reflected multiple times by the prism assembly before reaching the photosensitive element, and because the light passes through freeform surfaces within the prism assembly, the optical power of the prism assembly is greater than that of the objective lens. By allocating greater optical power to the prism assembly containing freeform surfaces, and utilizing multiple reflections within the prism to achieve optical path folding, the light propagates through one or more freeform surfaces of the prism assembly. The higher degree of freedom of the prism assembly then performs aberration correction, enabling precise and efficient aberration correction through asymmetric surfaces, thus fully utilizing the aberration correction capabilities of freeform surfaces. By allocating greater optical power to the prism assembly integrating freeform surfaces, aberration correction can be performed by the prism assembly itself, improving the correction effect and thus enhancing image quality. This achieves improved imaging performance of the camera module while reducing the size of the ultra-telephoto system within the camera module.

[0008] Secondly, the present application proposes an electronic device including a camera module as described in any of the above technical solutions.

[0009] The electronic device provided in this application includes a camera module as described in any of the above technical solutions. Therefore, during shooting, the camera module, through two first and second prisms with higher design freedom, can achieve a greater optical power than the objective lens, which helps to better utilize the aberration correction capability of the freeform surface and improve the system's imaging performance. This achieves both a lightweight design of the camera module on the electronic device and improved imaging performance during shooting.

[0010] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0012] Figure 1 This is one of the schematic diagrams of a camera module according to an embodiment of this application;

[0013] Figure 2 This is a second schematic diagram of a camera module according to an embodiment of this application;

[0014] Figure 3 This is one of the defocus curve diagrams of the camera module according to the embodiments of this application;

[0015] Figure 4 This is the second defocus curve diagram of the camera module according to the embodiments of this application;

[0016] Figure 5 This is the third defocus curve diagram of the camera module according to the embodiments of this application;

[0017] Figure 6 This is one of the light aberration curves of the camera module according to an embodiment of this application;

[0018] Figure 7 This is a second example of a light aberration curve diagram of a camera module according to an embodiment of this application;

[0019] Figure 8 This is the third of the light aberration curves of the camera module according to the embodiments of this application;

[0020] Figure 9 This is the fourth of the light aberration curves of the camera module according to the embodiments of this application;

[0021] Figure 10 This is the fifth of the light aberration curves of the camera module according to the embodiments of this application;

[0022] Figure 11 This is the sixth of the light aberration curves of the camera module according to the embodiments of this application.

[0023] Figure label:

[0024] 100 Camera module, 110 Objective lens, 120 Prism assembly, 122 First prism, 124 Second prism, 130 Photosensitive component, 140 First surface, 142 Second surface, 144 Third surface, 150 Fourth surface, 152 Fifth surface, 154 Sixth surface. Detailed Implementation

[0025] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The following is combined Figures 1-11 This application describes a camera module 100 and an electronic device according to embodiments thereof.

[0030] like Figure 1 and Figure 2 As shown, a camera module 100 according to some embodiments of this application includes an objective lens 110, a prism assembly 120, and a photosensitive component 130. The prism assembly 120 is disposed on the light-emitting side of the objective lens 110. The prism assembly 120 includes a first prism 122 and a second prism 124. The distance between the first prism 122 and the objective lens 110 is less than the distance between the first prism 122 and the second prism 124. The first prism 122 and / or the second prism 124 include at least one freeform surface. The photosensitive component 130 is located on the side of the prism assembly 120 away from the objective lens 110. The light emitted from the objective lens 110 is transmitted to the photosensitive component 130 after multiple reflections by the prism assembly 120. When the light is transmitted within the prism assembly 120, the light passes through the freeform surface, and the optical power of the prism assembly 120 is greater than the optical power of the objective lens 110.

[0031] The camera module 100 provided in this application includes an objective lens 110, a prism assembly 120, and a photosensitive component 130. The prism assembly 120 is disposed on the light-emitting side of the objective lens 110. The prism assembly 120 includes a first prism 122 and a second prism 124. The distance between the first prism 122 and the objective lens 110 is less than the distance between the first prism 122 and the second prism 124. The first prism 122 and / or the second prism 124 include at least one freeform surface. The photosensitive component 130 is located on the side of the prism assembly 120 away from the objective lens 110. Multiple reflections inside the prism assembly 120 can be used to achieve optical path folding, thereby compressing the physical size of the ultra-telephoto system and realizing a lightweight design of the system volume. Since the light emitted from the objective lens 110 is transmitted to the photosensitive element 130 after multiple reflections by the prism assembly 120, and the light passes through a freeform surface during its transmission within the prism assembly 120, the optical power of the prism assembly 120 is greater than that of the objective lens 110. By allocating a larger optical power to the prism assembly 120 containing the freeform surface, the light path is folded by multiple reflections within the prism. During its propagation, the light passes through one or more freeform surfaces. Through the asymmetric surface with a higher degree of freedom, aberration correction can be performed accurately and efficiently, allowing the aberration correction capability of the freeform surface to be fully utilized. This improves the imaging performance of the camera module 100 while reducing the volume occupied by the ultra-telephoto system within the camera module 100.

[0032] The first prism 122 may include at least one freeform surface, and the second prism 124 may include at least one freeform surface. A freeform surface refers to a surface whose shape cannot be continuously processed and has the arbitrary characteristics of traditional processing.

[0033] Specifically, when light passes through the prism assembly 120, the light passes through a freeform surface. The optical power of the prism assembly 120 is greater than that of the objective lens 110. The prism assembly 120 can perform aberration correction. At the same time, the specifications of the objective lens 110 do not need to be adjusted too much to complete the aberration correction. This avoids unreasonable abrupt changes in the surface morphology of the camera module 100 caused by excessive adjustment of the objective lens 110 size, thereby reducing the difficulty of component manufacturing in the production of electronic devices.

[0034] Furthermore, the first prism 122 and / or the second prism 124 provided in this application include at least one freeform surface. Light can be transmitted through multiple freeform surfaces, which can increase the degree of freedom for aberration correction, thereby achieving a greater amount of light transmission and increasing the imaging size of the optical lens while ensuring imaging quality.

[0035] like Figure 2 As shown, the path of light transmission is A.

[0036] like Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The dashed line represents the non-light-transmitting portion of the first prism 122 and the second prism 124.

[0037] Specifically, both the first prism 122 and the second prism 124 can have a polygonal shape. The first prism 122 has a reflecting surface and a fully internal reflecting surface, and the second prism 124 has a reflecting surface and a fully internal reflecting surface.

[0038] According to some embodiments of this application, the first prism 122 includes a first surface 140, a second surface 142, and a third surface 144. The first surface 140 is opposite to the objective lens 110. One side of the second surface 142 is connected to one side of the first surface 140. The two sides of the third surface 144 are respectively connected to the other side of the first surface 140 and the other side of the second surface 142. The third surface 144 is opposite to the second prism 124. The light emitted from the objective lens 110 is transmitted through the first surface 140 into the first prism 122, reflected by the second surface 142 and the first surface 140, and transmitted through the third surface 144 into the second prism 124. At least one of the first surface 140, the second surface 142, and the third surface 144 is a freeform surface.

[0039] In this embodiment, the first prism 122 includes a first surface 140, a second surface 142, and a third surface 144. The first surface 140 faces the objective lens 110 and is used to transmit light emitted from the objective lens 110 into the first prism 122. One side of the second surface 142 is connected to one side of the first surface 140, and both sides of the third surface 144 are connected to the other side of the first surface 140 and the other side of the second surface 142, respectively. The third surface 144 faces the second prism 124. Light emitted from the objective lens 110 is transmitted through the first surface 140 into the first prism 122, reflected by the second surface 142 and the first surface 140, and then transmitted through the third surface 144 into the second prism 124, thus achieving light transmission and improving imaging performance while ensuring a compact system design. Among them, at least one of the first surface 140, the second surface 142, and the third surface 144 is a freeform surface. Light passing through multiple freeform surfaces increases the degrees of freedom for aberration correction, thereby achieving greater light transmission and increasing the image size while maintaining image quality. Since light passes through at least one freeform surface during propagation, the asymmetric surface with higher degrees of freedom enables precise and efficient aberration correction, fully utilizing the aberration correction capability of the freeform surface. This improves the imaging performance of the camera module 100 while reducing the volume occupied by the ultra-telephoto system within the camera module 100.

[0040] According to some embodiments of this application, the third surface 144 has positive optical power.

[0041] In this embodiment, since the third surface 144 has positive optical power, the first prism 122 has the function of converging light. When the camera module 100 is working, the first prism 122 can be used to collect light and converge the incident light, so that the aperture of the incident light gradually becomes smaller.

[0042] According to some embodiments of this application, the second prism 124 includes a fourth surface 150, a fifth surface 152, and a sixth surface 154. The fourth surface 150 is opposite to the first prism 122. One side of the fifth surface 152 is connected to one side of the fourth surface 150. The fifth surface 152 is opposite to the fourth surface 150. The two sides of the sixth surface 154 are respectively connected to the other side of the fourth surface 150 and the other side of the fifth surface 152. The light emitted from the first prism 122 is transmitted through the fourth surface 150 into the second prism 124, and after being reflected by the fifth surface 152 and the sixth surface 154, it is transmitted through the fifth surface 152 to the photosensitive element 130. At least one of the fourth surface 150, the fifth surface 152, and the sixth surface 154 is a freeform surface.

[0043] In this embodiment, the second prism 124 includes a fourth surface 150, a fifth surface 152, and a sixth surface 154. The fourth surface 150 is opposite to the first prism 122. One side of the fifth surface 152 is connected to one side of the fourth surface 150. The fifth surface 152 is opposite to the fourth surface 150. The two sides of the sixth surface 154 are respectively connected to the other side of the fourth surface 150 and the other side of the fifth surface 152. The light emitted from the first prism 122 is transmitted through the fourth surface 150 into the second prism 124, and after being reflected by the fifth surface 152 and the sixth surface 154, it is transmitted through the fifth surface 152 to the photosensitive element 130. At least one of the fourth surface 150, the fifth surface 152, and the sixth surface 154 is a freeform surface. Because at least one freeform surface is introduced in the fourth surface 150, the fifth surface 152, and the sixth surface 154, the optical path corrected by the first prism 122 is optimized. Through its highly asymmetric design freedom, it precisely compensates for and balances the inherent, particularly prominent, off-axis aberrations in the periscope telephoto system, thereby improving imaging performance. Specifically, it can improve the sharpness of the edge field of view and the uniformity of the overall image. By cooperating with the first prism 122 using a second prism 124, which has at least one freeform surface, the aberration correction capability of the freeform surface is fully utilized. This improves the imaging performance of the camera module 100 while reducing the volume occupied by the ultra-telephoto system within the camera module 100.

[0044] According to some embodiments of this application, the fourth surface 150 has negative optical power.

[0045] In this embodiment, the second prism 124, through the fourth surface 150, can efficiently correct symmetry aberrations, flatten the image surface, and optimize the optical path structure by controlling the divergence of light, thereby cooperating with the subsequent free-reflecting surface to improve the imaging quality of the camera module 100.

[0046] According to some embodiments of this application, the ratio of the focal length of the first prism 122 to the focal length of the camera module 100 is greater than or equal to 0.45 and less than or equal to 0.55.

[0047] In this embodiment, by limiting the ratio of the focal length of the first prism 122 to the focal length of the camera module 100 to be greater than or equal to 0.45 and less than or equal to 0.55, it participates in imaging at depth while reversing the optical path, working together with the objective lens 110 to correct aberrations. This avoids the objective lens 110 or a single prism component bearing too much optical power, which would make aberration correction difficult. Furthermore, in conjunction with the second prism 124, two freeform prisms with higher design freedom can bear a greater optical power than the objective lens 110, helping to better utilize the aberration correction capability of the freeform surface and improve the system's imaging performance.

[0048] Specifically, the ratio of the focal length of the first prism 122 to the focal length of the camera module 100 can be 0.45, 0.48, 0.52, or 0.55.

[0049] According to some embodiments of this application, the ratio of the focal length of the second prism 124 to the focal length of the camera module 100 is greater than or equal to 0.35 and less than or equal to 0.45.

[0050] In this embodiment, by limiting the ratio of the focal length of the second prism 124 to the focal length of the camera module 100 to be greater than or equal to 0.35 and less than or equal to 0.45, the second prism 124 participates in imaging at depth while refracting light, and works with the first prism 122 to correct aberrations. In conjunction with the first prism 122, it achieves a greater optical power than the objective lens 110 by using two freeform prisms with higher design freedom. This helps to better utilize the aberration correction capability of the freeform surface and improve the imaging performance of the system.

[0051] Specifically, the ratio of the focal length of the second prism 124 to the focal length of the camera module 100 can be 0.35, 0.38, 0.42, or 0.45.

[0052] According to some embodiments of this application, the ratio of the focal length of the objective lens 110 to the focal length of the camera module 100 is greater than or equal to 1.05 and less than or equal to 1.2.

[0053] In this embodiment, by limiting the ratio of the focal length of the objective lens 110 to the focal length of the camera module 100 to be greater than or equal to 1.05 and less than or equal to 1.2, the ratio is controlled to ensure that the objective lens 110 operates within a controllable size, thereby improving imaging performance.

[0054] Specifically, the ratio of the focal length of objective lens 110 to the focal length of camera module 100 can be 1.05, 1.1, 1.15, or 1.2.

[0055] According to some embodiments of this application, the Abbe number of objective lens 110 is greater than or equal to the Abbe number of second prism 124, and / or the Abbe number of first prism 122 is greater than or equal to the Abbe number of second prism 124.

[0056] In this embodiment, the Abbe number of objective lens 110 is greater than or equal to the Abbe number of second prism 124, and the Abbe number of first prism 122 is greater than or equal to the Abbe number of second prism 124. Since the Abbe numbers of the materials used to prepare objective lens 110 and first prism 122 are greater than those of second prism 124, i.e., objective lens 110 and first prism 122 with positive optical power are made of materials with high Abbe numbers, while second prism 124 with negative optical power is made of materials with low Abbe numbers, this helps to balance the axial chromatic aberration of the system.

[0057] According to some embodiments of this application, the refractive index of objective lens 110 is greater than or equal to 1.5 and less than or equal to 1.6; the refractive index of first prism 122 is greater than or equal to 1.35; and the refractive index of second prism 124 is greater than or equal to 1.6.

[0058] In this embodiment, by defining the refractive index of objective lens 110 as greater than or equal to 1.5 and less than or equal to 1.6; the refractive index of first prism 122 as greater than or equal to 1.35; and the refractive index of second prism 124 as greater than or equal to 1.6, the Abbe number of the material prepared by objective lens 110 and first prism 122 is greater than that of second prism 124. This helps to ensure the rationality and availability of the material type, and also helps to balance the axial chromatic aberration of the system.

[0059] Specifically, the refractive index of objective lens 110 can be 1.5, 1.51, 1.52, 1.53, or 1.6.

[0060] Specifically, the refractive index of the first prism 122 is greater than or equal to 1.35, or less than or equal to 1.9. The refractive index of the first prism 122 can be 1.35, 1.45, 1.55, or 1.9.

[0061] Specifically, the refractive index of the second prism 124 is greater than or equal to 1.6, or less than or equal to 2.5. The refractive index of the second prism 124 can be 1.6, 1.65, 1.75, or 2.5.

[0062] According to some embodiments of this application, the half-diagonal height of the photosensitive element 130 is greater than or equal to 3.4 mm and less than or equal to 3.7 mm.

[0063] In this embodiment, by limiting the half-diagonal height of the photosensitive element 130 to be greater than or equal to 3.4 mm and less than or equal to 3.7 mm, the photosensitive element 130 can cooperate with the first prism 122 and the second prism 124 to improve the imaging effect while reducing the volume occupied by the camera module 100, thereby achieving a lightweight design and improved imaging performance.

[0064] Specifically, the half-diagonal height of the photosensitive element 130 can be 3.4 mm, 3.5 mm, 3.6 mm, or 3.7 mm.

[0065] Specifically, such as Figure 3 As shown, Figure 3 The horizontal axis represents the defocusing position, measured in millimeters (mm), ranging from -0.06mm to +0.06mm. 0 represents the optimal focusing plane. Negative values ​​indicate the focal plane shifts towards the lens, while positive values ​​indicate it shifts towards the image sensor. The vertical axis represents the modulation transfer function (MTF). The solid line represents the MTF curve in the Y-axis at the relative field of view (0, 0), i.e., at the center of the image field (field of view). The dashed line represents the MTF curve in the X-axis at the same relative field of view (0, 0). A high degree of overlap between the curves indicates that the first prism 122 and the second prism 124 correct astigmatism, improving imaging performance. Simultaneously... Figure 3The peaks of both the solid line (Y direction) and the dashed line (X direction) are located where the defocus is 0, resulting in the clearest image. At this point, the modulation transfer function value is closest to 1, indicating good image performance. Figure 3 As can be seen from the distribution of the solid and dashed lines, this application, while keeping the value of the modulation transfer function closer to 1, widens the distribution range of the two curves on the horizontal axis (defocus), thus extending the usable depth of focus of the system, thereby achieving higher imaging quality through a small-volume camera module 100.

[0066] like Figure 4 As shown, Figure 4 The horizontal axis also represents the defocusing amount, with 0 representing the optimal focus plane. Negative values ​​indicate that the focal plane has moved towards the lens, while positive values ​​indicate that the focal plane has moved towards the image sensor. The vertical axis represents the modulation transfer function (MTF). The solid line represents the MTF curve in the Y direction at a relative field of view coordinate of (0, 1), while the dashed line represents the MTF curve in the X direction at the edge of the field of view coordinate of (0, 1).

[0067] like Figure 5 As shown, Figure 5 The horizontal axis also represents the defocusing amount, with 0 representing the optimal focus plane. Negative values ​​indicate that the focal plane has moved towards the lens, while positive values ​​indicate that the focal plane has moved towards the image sensor. The vertical axis represents the modulation transfer function (MTF). The solid line represents the MTF curve in the Y direction at a relative field of view coordinate of (1, 0), while the dashed line represents the MTF curve in the X direction at the edge of the field of view coordinate of (1, 0).

[0068] Specifically, such as Figure 6 As shown, Figure 6 The aberration distribution of the meridional beam (Y-FAN) at a relative field of view (0.00, 0.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the Y direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the Y direction on the image plane, i.e., the deviation between the Y coordinate of the actual imaging point of the light ray and the Y coordinate of the ideal principal ray imaging point on the image plane. Figure 6 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0069] like Figure 7 As shown, Figure 7The aberration distribution of the sagittal beam (X-FAN) at a relative field of view (0.00, 0.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the X-direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the X-direction on the image plane, i.e., the deviation between the X-coordinate of the actual imaging point of the light ray and the X-coordinate of the ideal principal ray imaging point on the image plane. Figure 7 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0070] like Figure 8 As shown, Figure 8 The aberration distribution of the meridional beam (Y-FAN) at a relative field of view (0.00, 1.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the Y direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the Y direction on the image plane, i.e., the deviation between the Y coordinate of the actual imaging point of the light ray and the Y coordinate of the ideal principal ray imaging point on the image plane. Figure 8 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0071] like Figure 9 As shown, Figure 9 The aberration distribution of the sagittal beam (X-FAN) at a relative field of view (0.00, 1.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the X-direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the X-direction on the image plane, i.e., the deviation between the X-coordinate of the actual imaging point of the light ray and the X-coordinate of the ideal principal ray imaging point on the image plane. Figure 9 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0072] like Figure 10 As shown, Figure 10 The aberration distribution of the meridional beam (Y-FAN) at a relative field of view (1.00, 0.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the Y direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the Y direction on the image plane, i.e., the deviation between the Y coordinate of the actual imaging point of the light ray and the Y coordinate of the ideal principal ray imaging point on the image plane. Figure 10 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0073] like Figure 11 As shown, Figure 11 The aberration distribution of the sagittal beam (X-FAN) at a relative field of view (1.00, 0.00) specifically illustrates the deviation of the focal position of light of different wavelengths in the X-direction after passing through the optical system. The horizontal axis represents the relative coordinates of the pupil of the optical system, i.e., the position of the light entering the lens (range -1 to 1). The vertical axis represents the deviation of the light ray from the principal ray in the X-direction on the image plane, i.e., the deviation between the X-coordinate of the actual imaging point of the light ray and the X-coordinate of the ideal principal ray imaging point on the image plane. Figure 11 The three lines represent three different wavelengths of light: the curve formed by "+" represents light with a wavelength of 656nm, the curve formed by "*" represents light with a wavelength of 587nm, and the curve formed by "△" represents light with a wavelength of 486nm. The three curves reflect the degree of difference in the image size of different colors of light. The low degree of separation between the curves indicates color aberration correction.

[0074] An electronic device according to some embodiments of this application includes a camera module 100 as described in any of the above embodiments.

[0075] In this embodiment, the electronic device includes a camera module 100 as described in any of the above embodiments. Therefore, during shooting, the camera module 100, through two more flexible design elements (first prism 122 and second prism 124), can achieve a greater optical power than the objective lens 110, which helps to better utilize the aberration correction capability of the freeform surface and improve the system's imaging performance. This achieves a lightweight design of the camera module 100 on the electronic device while simultaneously improving the imaging performance during shooting.

[0076] Specifically, the electronic device can be a mobile phone, a camera, or other electronic products with photographic functions. When the electronic device is a mobile phone, by setting two first prisms 122 and second prisms 124 with higher design freedom, a greater optical power than that of the objective lens 110 can be achieved. This can ensure imaging performance while reducing the axial width and volume of the camera module 100, thereby facilitating the lightweight or ultra-thin design of the mobile phone.

[0077] Specifically, the surface shape of objective lens 110 can be an even-order aspherical surface, satisfying the aspherical formula describing an aspherical surface:

[0078]

[0079] Where Z is the surface elevation, c is the surface curvature, r is the mirror coordinate in lens units, K is the conic constant, and A4, A6, A8, A10, A12, A14, A16, and A18 are aspherical coefficients.

[0080] According to some embodiments of this application, in a freeform prism super telephoto system composed of camera module 100, the focal length is f and the focal length of objective lens 110 is f0, satisfying the following relationship:

[0081] |f0 / f|=1.1;

[0082] The first prism 122 has a focal length of f1 and satisfies the following relationship:

[0083] |f1 / f|=0.5;

[0084] The second prism, with a focal length of f2, satisfies the following relationship:

[0085] |f² / f| = 0.4;

[0086] The material of objective lens 110 has a refractive index of Nd0 = 1.54 and an Abbe number of Vd0 = 60. The material of first prism 122 has a refractive index of Nd1 = 1.54 and an Abbe number of Vd1 = 60.0. The material of second prism 124 has a refractive index of Nd2 = 1.67 and an Abbe number of Vd2 = 32.3. This ensures that the Abbe numbers of the materials used for objective lens 110 and first prism 122 are greater than those of second prism 124. This allows for the selection of high Abbe number materials for objective lens 110 and first prism 122, which have positive optical power, and low Abbe number materials for second prism 124, which has negative optical power. This helps to balance the axial chromatic aberration of the system.

[0087] The specific parameters of objective lens 110, first prism 122, and second prism 124 are selected as shown in Table 1-1 below, where f is the system focal length, HFOV is the system half field of view, f0 is the focal length of objective lens 110, f1 is the focal length of first prism 122, f2 is the focal length of second prism 124, HD is the half diagonal height of the photosensitive element, and Fno is the system aperture number.

[0088] Table 1-1

[0089] f HFOV f0 f1 f2 HD Fno 36.7mm 5.2° 41.7mm 17.1mm -14.3mm 3.6mm 3.5

[0090] By limiting the parameters and specifications of objective lens 110, first prism 122 and second prism 124, it is possible to achieve a greater optical power than objective lens 110 by using two freeform prisms with higher design freedom. This helps to better utilize the aberration correction capability of freeform surfaces and improve the imaging performance of the system.

[0091] The origin of the global coordinate system is taken as the vertex of the aperture stop, and X, Y, and Z are the coordinate values ​​in the three-dimensional coordinate system. The global vertex coordinates and tilt angles of the surfaces of the first prism 122, the second prism 124, the objective lens 110, and other components in the camera module 100 are shown in Tables 1-2, 1-3, 1-4, and 1-5.

[0092] Table 1-2

[0093]

[0094] Table 1-3

[0095]

[0096] Table 1-4

[0097]

[0098]

[0099] Table 1-5

[0100] element Photosensitive components X / mm 0 Y / mm -29.396 Z / mm 13.000 Tilt angle / ° 8.462

[0101] As shown in Tables 1-6 below, the table shows the surface parameters of the objective lens 110 in the camera module 100, including the radius of curvature and aspherical coefficient.

[0102] Table 1-6

[0103] First surface Second surface Radius of curvature (mm) 22.654 -4358.772 A4 -4.448e-05 -2.716e-05 A6 -1.671e-07 -7.634e-08 A8 -3.425e-09 -3.186e-09 A10 -1.001e-10 -1.113e-10 A12 -2.886e-12 -2.4705e-12 A14 -5.415e-14 -2.422e-14 A16 -3.225e-16 8.535e-18 A18 4.212e-17 4.222e-16

[0104] By using the specifications in Table 1-6 above, the light deflection angle at the edges can be changed to coincide with the focal point of paraxial rays, thereby almost completely eliminating spherical aberration. The system can use a larger aperture (increasing the amount of light) without degrading image quality. In Table 1-6, A4, A6, A8, A10, A12, A14, A16, and A18 are aspherical coefficients.

[0105] As shown in Table 1-7 below, the surface parameters of the first face 140 of the first prism 122 are represented by XY polynomial coefficients.

[0106] Table 1-7

[0107] Y2 2.261E-04 X2Y -1.454E-05 X4Y2 -1.427E-07 Y3 -5.772E-06 X2Y2 2.240E-07 X4Y3 -1.159E-08 Y4 2.344E-07 X2Y3 5.752E-08 X4Y4 5.172E-09 Y5 2.400E-11 X2Y4 -2.334E-08 X6 -6.410E-08 Y6 -6.270E-10 X2Y5 -3.163E-10 X6Y -2.039E-08 Y7 2.487E-11 X2Y6 5.912E-11 X6Y2 2.482E-09 Y8 2.772E-12 X4 -2.988E-06 X8 8.374E-10 X2 -5.250E-04 X4Y 7.066E-08

[0108] As shown in Table 1-8 below, the surface parameters of the second face 142 of the first prism 122 are represented by XY polynomial coefficients.

[0109] Table 1-8

[0110] Y2 -5.963E-04 X2Y 6.182E-06 X4Y2 7.159E-08 Y3 8.076E-06 X2Y2 -7.525E-06 X4Y3 -1.241E-08 Y4 -2.376E-06 X2Y3 1.908E-07 X4Y4 -6.977E-10 Y5 6.345E-08 X2Y4 7.105E-08 X6 1.504E-08 Y6 9.286E-09 X2Y5 -4.744E-09 X6Y -1.142E-08 Y7 -7.699E-10 X2Y6 -4.436E-10 X6Y2 -6.540E-10 Y8 2.311E-11 X4 -5.587E-06 X8 -3.053E-11 X2 -1.623E-03 X4Y 2.137E-07

[0111] Table 1-9

[0112]

[0113] As shown in Table 1-9 above, the table displays the surface parameters of the third face 144 of the first prism 122, including the radius of curvature, the Zernike polynomial coefficients, and the normalized radius. ZP4, ZP5, ZP9, ZP10, ZP11, ZP12, ZP13, ZP19, ZP20, ZP21, ZP22, ZP23, ZP24, ZP25, ZP33, ZP34, ZP35, ZP36, ZP37, ZP38, ZP39, ZP40, and ZP41 are the Zernike polynomial coefficients.

[0114] As shown in Table 1-10 below, the table displays the surface parameters of the fourth face 150 of the second prism 124, including the radius of curvature, standard ZPk coefficients, and normalized radius. In Table 1-10, ZP4, ZP5, ZP9, ZP10, ZP11, ZP12, ZP13, ZP19, ZP20, ZP21, ZP22, ZP23, ZP24, ZP25, ZP33, ZP34, ZP35, ZP36, ZP37, ZP38, ZP39, ZP40, and ZP41 are ZPk polynomial coefficients.

[0115] Table 1-10

[0116]

[0117]

[0118] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0119] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A camera module, characterized in that, include: Objective lens; A prism assembly is disposed on the light-emitting side of the objective lens. The prism assembly includes a first prism and a second prism. The distance between the first prism and the objective lens is less than the distance between the first prism and the second prism. The first prism and / or the second prism includes at least one freeform surface. A photosensitive element is located on the side of the prism assembly away from the objective lens. Light emitted from the objective lens is transmitted to the photosensitive element after multiple reflections by the prism assembly. When the light is transmitted within the prism assembly, it passes through the freeform surface, and the optical power of the prism assembly is greater than that of the objective lens.

2. The camera module according to claim 1, characterized in that, The first prism includes: The first surface is opposite to the objective lens; The second side, one side of the second side is connected to one side of the first side; The third surface has two sides that are connected to the other side of the first surface and the other side of the second surface, respectively, and the third surface is opposite to the second prism; The light emitted from the objective lens is transmitted through the first surface into the first prism, reflected by the second surface and the first surface, and transmitted through the third surface into the second prism. At least one of the first surface, the second surface, and the third surface is the freeform surface.

3. The camera module according to claim 1, characterized in that, The second prism includes: The fourth surface is opposite to the first prism; The fifth surface, one side of which is connected to one side of the fourth surface, is opposite to the fourth surface; The sixth surface, the two sides of which are respectively connected to the other side of the fourth surface and the other side of the fifth surface; In this process, the light emitted from the first prism is transmitted through the fourth surface into the second prism, reflected by the fifth and sixth surfaces, and then transmitted through the fifth surface to the photosensitive component. At least one of the fourth, fifth, and sixth surfaces is the freeform surface.

4. The camera module according to claim 1, characterized in that, The ratio of the focal length of the first prism to the focal length of the camera module is greater than or equal to 0.45 and less than or equal to 0.

55.

5. The camera module according to claim 1, characterized in that, The ratio of the focal length of the second prism to the focal length of the camera module is greater than or equal to 0.35 and less than or equal to 0.

45.

6. The camera module according to claim 1, characterized in that, The ratio of the focal length of the objective lens to the focal length of the camera module is greater than or equal to 1.05 and less than or equal to 1.

2.

7. The camera module according to claim 1, characterized in that, The Abbe number of the objective lens is greater than or equal to the Abbe number of the second prism; and / or The Abbe number of the first prism is greater than or equal to the Abbe number of the second prism.

8. The camera module according to any one of claims 1 to 7, characterized in that, The refractive index of the objective lens is greater than or equal to 1.5 and less than or equal to 1.6; The refractive index of the first prism is greater than or equal to 1.35; The refractive index of the second prism is greater than or equal to 1.

6.

9. The camera module according to any one of claims 1 to 7, characterized in that, The height of the half-diagonal of the photosensitive element is greater than or equal to 3.4 mm and less than or equal to 3.7 mm.

10. An electronic device, characterized in that, include: The camera module as described in any one of claims 1 to 9.

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