Lens module, camera module and electronic equipment

Abstract

The invention discloses a lens module, a camera module, electronic equipment, an imaging lens and a light beam deflection device. The light beam deflection device deflects N times in each period to enter an initial state and (N-1) deflection states, so that the lens module generates a reference image and (N-1) displacement images on an imaging surface, the (N-1) displacement images deflect along specific (N-1) directions relative to the reference image, and N is an integer greater than or equal to 2; when the light beam deflection device is switched from an initial state to a deflection state, the central view field image height change delta IHc, the edge view field image height change delta IHe and the lens magnification x of the lens module meet a relational expression of 0.05 lt; [delta] IHe / [delta] IHc / xlt; and 0.8. According to the invention, while the lens module is kept miniaturized, the electronic equipment can obtain a high-pixel image during photographing, and the high-magnification photographing performance is greatly improved.

Description

Technical Field

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

[0002] With the increasing multifunctionality of mobile phones and other electronic devices, photography has become an essential function for many electronic devices, which may have multiple camera modules such as main camera, telephoto, and wide-angle.

[0003] However, when using high-magnification telephoto lenses to capture high-resolution images, the large focal length of these lenses necessitates a larger lens module for zooming, making it difficult to achieve both a large aperture and a large image sensor size. This results in photos that do not meet the user's expectations. Therefore, improvements are needed to achieve high-resolution images while maintaining a compact design, significantly enhancing high-magnification shooting performance. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a lens module, a camera module, and an electronic device that can keep the lens module miniaturized while the electronic device can acquire high-pixel images when taking pictures, thus greatly improving the high-magnification shooting performance. This invention provides a lens module, which includes an imaging lens and a beam deflection device. The beam deflection device deflects N times in each cycle to enter an initial state and N-1 deflection states, so that the lens module generates a reference image and N-1 displacement images on the imaging plane. The N-1 displacement images are offset relative to the reference image in N-1 specific directions, where N≥2 and N is an integer. When the beam deflection device switches from the initial state to the deflection state, the image height change ΔIHc of the center field of view, the image height change ΔIHe of the edge field of view, and the lens magnification x of the lens module satisfy the relationship 0.05<ΔIHe / ΔIHc / x<0.8.

[0005] Optionally, the imaging lens and the beam deflection device are arranged sequentially from the object side to the image side along the optical axis, or the beam deflection device and the imaging lens are arranged sequentially from the object side to the image side along the optical axis.

[0006] Optionally, the beam deflection device is a transparent flat plate lens, which is flat in shape; when the imaging lens and the transparent flat plate lens are arranged sequentially from the object side to the image side along the optical axis, the distance d2 between the center of the transparent flat plate lens and the imaging surface satisfies: 0.3mm≤d2≤7mm; or, when the transparent flat plate lens and the imaging lens are arranged sequentially from the object side to the image side along the optical axis, the distance d3 between the center of the transparent flat plate lens and the imaging lens satisfies: 0.1mm≤d3≤3mm.

[0007] Optionally, the PV of the transparent flat lens satisfies: 1 / 20 λ≤PV≤1 / 4 λ, and / or the refractive index n1 of the transparent flat lens satisfies: 1.5≤n1≤1.9.

[0008] Optionally, the deflection angle θ of the transparent flat lens in the deflection state satisfies: 0°≤θ≤2°.

[0009] Optionally, when the transparent flat lens switches from the initial state to the deflection state, the image height change ΔIHc of the center field of view of the lens module, the incident angle θ1 of the edge field of view beam incident on the transparent flat lens, the refractive index n0 of the medium before incident, the refractive index n1 and the thickness t of the transparent flat lens after incident satisfy the following relationship: ΔIHc=(1-n0 / n1)*θ1*t.

[0010] Optionally, 1 <N<20。

[0011] Optionally, N=4.

[0012] Optionally, when N=4 and the beam deflection device is in the deflection state, the lens module will shift the image height by 0.3p~0.7p, where p is the image pixel size.

[0013] Optionally, the lens magnification x, focal length EFL, holographic height y, and main camera equivalent focal length f of the lens module satisfy the following relationship: x = EFL / (y / 43.3*f), and 2 <x<20。

[0014] Optionally, the thickness d1 of the beam deflection device satisfies: 0.1mm ≤ d1 ≤ 2mm Optionally, the beam deflection device is a tunable lens, which includes a first transparent plate, a second transparent plate, and a deformable medium disposed between the first transparent plate and the second transparent plate. When the beam deflection device enters the initial state, the first transparent plate and the second transparent plate are parallel to each other, so that the beam deflection device is in a plate shape. When the beam deflection device is in a deflection state, the first transparent plate and / or the second transparent plate deflect and squeeze the deformable medium, so that the beam deflection device is in a wedge shape.

[0015] Optionally, the beam deflection device includes at least one set of piezoelectric sheets and pressure blocks connected together, with the pressure blocks fixedly disposed on the first transparent plate or the second transparent plate; the piezoelectric sheets extend or bend according to the received driving signal and drive the pressure blocks, causing the first transparent plate or the second transparent plate connected to the pressure blocks to deflect.

[0016] Optionally, the beam deflection device includes at least one set of driving circuits and piezoelectric elements connected together. The piezoelectric elements are fixedly disposed on the first transparent plate or the second transparent plate. The piezoelectric elements receive driving signals through the driving circuits to extend or retract, thereby driving the first transparent plate or the second transparent plate to deflect.

[0017] Optionally, the beam deflection device is driven by a voice coil motor, a piezoelectric controller, or a microelectromechanical system (MEMS).

[0018] Optionally, the field of view (FOV) of the lens module satisfies: 8°≤FOV≤40°.

[0019] Optionally, the imaging lens includes at least three lenses. 。

[0020] Optionally, it also includes a prism disposed between the imaging lens and the beam deflection device.

[0021] Optionally, the prism includes an incident surface, a reflecting surface, and an exit surface, with the exit surface of the prism disposed opposite to the imaging surface.

[0022] The present invention also provides a camera module, the camera module including the lens module described above; the imaging surface of the lens module is disposed on the photosensitive surface of the imaging chip; the imaging chip processes and synthesizes a high-resolution image based on the reference image and the N-1 displacement images. The present invention also provides an electronic device comprising the above-described camera module.

[0023] The present invention provides a lens module, a camera module, and an electronic device. The lens module includes an imaging lens and a beam deflection device. The beam deflection device deflects N times in each cycle to enter an initial state and N-1 deflection states, enabling the lens module to generate a reference image and N-1 displacement images on the imaging plane. The N-1 displacement images are offset relative to the reference image along N-1 specific directions, where N≥2 and N is an integer. When the beam deflection device switches from the initial state to the deflection state, the image height change ΔIHc of the center field of view, the image height change ΔIHe of the edge field of view, and the lens magnification x satisfy the relationship 0.05<ΔIHe / ΔIHc / x<0.8. The lens module of the present invention can generate a reference image with different image details and N-1 displacement images. The camera module can process and synthesize the reference image and N-1 displacement images into a high-pixel image through an imaging chip. Thus, while maintaining the miniaturization of the lens module, the electronic device can acquire high-pixel images during photography, significantly improving high-magnification shooting performance. Attached Figure Description

[0024] Figure 1A schematic diagram of the image height variation of the lens module in one embodiment of this application is shown.

[0025] Figure 2 A schematic diagram of an embodiment of this application for processing and synthesizing a high-resolution image is shown.

[0026] Figure 3 A cross-sectional schematic diagram of the lens module in its initial state is shown in one embodiment of this application.

[0027] Figure 4 A cross-sectional schematic diagram of the lens module in a deflected state is shown in one embodiment of this application.

[0028] Figure 5 A cross-sectional schematic diagram of the lens module in its initial state is shown in another embodiment of this application.

[0029] Figure 6 A cross-sectional schematic diagram of the lens module in a deflected state is shown in another embodiment of this application.

[0030] Figure 7 A schematic diagram of the beam deflection device in one embodiment of this application is shown.

[0031] Figure 8 A schematic diagram of the structure of a piezoelectric element in one embodiment of this application is shown.

[0032] Figure 9 A schematic diagram of the beam deflection device in another embodiment of this application is shown.

[0033] Figure 10 A cross-sectional schematic diagram of the lens module in its initial state is shown in another embodiment of this application.

[0034] Figure 11 A cross-sectional schematic diagram of the lens module in a deflected state is shown in another embodiment of this application.

[0035] Figure 12 A high-resolution schematic diagram of an imaging image is shown in one embodiment of this application.

[0036] Figures 13A to 13D The diagram shows a pixel representation of four images obtained by upsampling an imaging chip in one embodiment of this application.

[0037] Figures 14A to 14D A pixel diagram of an imaging chip processing and synthesizing a high-pixel image is shown in one embodiment of this application.

[0038] Figure 15 A cross-sectional schematic diagram of the lens module of Embodiment 1 of this application is shown.

[0039] Figure 16A cross-sectional schematic diagram of the lens module of Embodiment 2 of this application is shown.

[0040] Figure 17 A cross-sectional schematic diagram of the lens module of Embodiment 3 of this application is shown.

[0041] Figure 18 A cross-sectional schematic diagram of the lens module of Embodiment 4 of this application is shown. Detailed Implementation

[0042] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the present invention; some well-known parts may not be shown. In the various drawings, the same elements are represented by similar reference numerals. For clarity, the various parts in the drawings are not necessarily drawn strictly to scale.

[0043] It is important to understand that the terms "first," "second," "third," "fourth," etc., are used merely to distinguish elements or circuits with similar properties, and do not indicate or imply relative importance or a specific order. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the listed elements but also other elements not expressly listed.

[0044] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shape of the sphere shown in the drawings is illustrated by way of example. That is, the shape of the sphere is not limited to that shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0045] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] The features, principles and other aspects of this application are described in detail below.

[0048] like Figure 1 As shown, this application provides a lens module, which includes an imaging lens 10 and a beam deflection device 20. The imaging lens 10 includes multiple lenses. The beam deflection device 20 deflects N times in each cycle to enter an initial state and N-1 deflection states, so that the lens module performs one original sampling and N-1 offset samplings in each cycle, and generates a reference image and N-1 displacement images on the imaging surface IMG. The N-1 displacement images are displaced relative to the reference image in a specific direction, where N≥2 and N is an integer. When the beam deflection device 20 enters the initial state, the beam deflection device 20 and the light rays are shown as solid lines. After the light rays pass through the imaging lens 10 and the beam deflection device 20, a reference image without displacement is generated on the imaging surface IMG. When the beam deflection device 20 enters the deflection state, as shown by the dotted line, a specific side of the beam deflection device 20 deflects around the center towards the object side, causing the light to shift in a specific direction when it passes through the imaging lens 10 and the beam deflection device 20. This results in a displacement image being generated on the imaging surface IMG. Since the imaging surface and the imaging chip corresponding to it are fixed, the photosensitive position of the imaging chip remains unchanged. The imaging chip will record different light rays before and after deflection. If the sampling process is viewed from the object plane, the sampling position of the object before and after deflection is different, resulting in different object details. That is, the displacement image recorded by the imaging chip will have slight differences from the reference image. By aligning the reference image and N-1 displacement images using an algorithm and combining them into a single image, a higher resolution image can be obtained. The final image quality is higher than that of an imaging chip with the same pixel size, smaller pixel dimensions, and higher pixel count.

[0049] in, Figure 1 The example image only shows a vertical downward offset relative to a reference image, but this application is not limited to this. For example, the displacement image may be offset horizontally or diagonally (i.e., at 45 degrees to both the vertical and horizontal directions) relative to the reference image, etc. Meanwhile, Figure 1The example only illustrates how the beam deflection device 20 generates a corresponding displacement image in one deflection state. The beam deflection device 20 of this application deflects N times in each cycle to enter an initial state and N-1 deflection states. Therefore, the beam deflection device 20 generates N-1 corresponding displacement images in the N-1 deflection states. These N-1 displacement images are offset relative to the reference image along specific N-1 directions, where N ≥ 2 and N is an integer. For example, the beam deflection device 20 deflects four times in each cycle to enter an initial state and three deflection states, causing the lens module to generate a reference image and three displacement images on the imaging plane IMG. The first displacement image is, for example, offset horizontally relative to the reference image, for example, offset to the right by 0.3p to 0.7p; the second displacement image is, for example, offset diagonally relative to the reference image, for example, offset to the lower right by 0.3p to 0.7p; and the third displacement image is, for example, offset vertically relative to the reference image, for example, offset downwards by 0.3p to 0.7p. Here, p is the image pixel size.

[0050] Among them, such as Figure 1 As shown, when the beam deflection device 20 switches from the initial state to the deflection state, the image generated by the lens module on the imaging plane IMG switches from the reference image to the displacement image. Furthermore, the center field-of-view image height change ΔIHc, the edge field-of-view image height change ΔIHe, and the lens magnification x satisfy the relationship 0.05 < ΔIHe / ΔIHc / x < 0.8. Here, the lens magnification x refers to the ratio of the current lens's equivalent focal length to the main camera's equivalent focal length f. Satisfying 0.05 < ΔIHe / ΔIHc / x < 0.8, by controlling the center field-of-view image height change ΔIHc, the edge field-of-view image height change ΔIHe, and the lens magnification x within a reasonable range, it is beneficial for obtaining better imaging results in post-processing after high-magnification shooting.

[0051] like Figure 2 As shown in the example, when processing and synthesizing a high-pixel image, the lens module performs original sampling and offset sampling in each cycle. The original sampling obtains a reference image under the solid grid, and the offset sampling obtains a displacement image under the dashed grid. The displacement image will have slight differences from the reference image. By aligning and synthesizing the reference image and the displacement image through an algorithm, a high-pixel image with improved resolution can be obtained. The final imaging quality is higher than that of an imaging chip with the same sampling pixel size, small pixel dimensions, and high pixel count.

[0052] Thus, the lens module can generate a reference image with different image details and N-1 displacement images. The camera module or mobile device can process and synthesize the reference image and N-1 displacement images into a high-pixel image through the imaging chip. Thus, while keeping the lens module small, the electronic device can acquire high-pixel images when taking pictures, which greatly improves the high-magnification shooting performance.

[0053] In an exemplary implementation, such as Figure 1 As shown, an imaging lens 10 and a beam deflection device 20 are arranged sequentially from the object side to the image side along the optical axis. In another exemplary embodiment, the beam deflection device 20 and the imaging lens 10 are arranged sequentially from the object side to the image side along the optical axis.

[0054] In an exemplary implementation, such as Figure 1 As shown, the beam deflection device 20 is a transparent flat plate lens, which is flat in shape. The transparent flat plate lens can be a single optical element, which is a single piece of transparent flat plate structure, such as a single piece of transparent glass. Alternatively, the transparent flat plate lens can be a combination of multiple optical elements, whose combined shape is generally a flat plate structure, and the relative positions of each optical element remain fixed, making the flat plate structure fixed and unchangeable. For example, the transparent flat plate lens can include multiple stacked transparent plates; or, the transparent flat plate lens can include two transparent plates whose surfaces are parallel and relatively fixed. A medium can be placed between the two transparent plates; the medium can be air, glue, or other materials.

[0055] In an exemplary implementation, such as Figure 1 As shown, when the imaging lens 10 and the transparent flat lens are arranged sequentially from the object side to the image side along the optical axis, the distance d2 between the center of the transparent flat lens and the imaging surface IMG satisfies: 0.3mm ≤ d2 ≤ 7mm. In another exemplary embodiment, when the transparent flat lens and the imaging lens 10 are arranged sequentially from the object side to the image side along the optical axis, the distance d3 between the center of the transparent flat lens and the imaging lens 10 satisfies: 0.1mm ≤ d3 ≤ 3mm.

[0056] In an exemplary embodiment, the following condition can be satisfied: 1 / 20 λ ≤ PV ≤ 1 / 4 λ, where the peak-to-valley value of the transparent flat lens is PV, and λ is 310 nanometers. The PV value (Peak to Valley) of the transparent flat lens represents a key indicator of its surface shape quality, namely the vertical height difference between the highest and lowest points on the measured glass surface within the measurement area. It is mainly used to evaluate the processing accuracy and optical performance of the transparent flat lens. Satisfying 1 / 20 λ ≤ PV ≤ 1 / 4 λ, and controlling the range of PV values ​​for the transparent flat lens, helps to reduce aberrations such as spherical aberration and coma caused by surface unevenness, improves imaging resolution, and allows for effective control of the light propagation path, thereby enhancing the optical performance of the system.

[0057] In an exemplary embodiment, the following condition can be satisfied: 1.5 ≤ n1 ≤ 1.9, where the refractive index of the transparent flat lens is n1. Satisfying 1.5 ≤ n1 ≤ 1.9, and controlling the range of values ​​for the refractive index n1 of the transparent flat lens, facilitates precise control of the light propagation direction, thereby enabling the transparent flat lens to control the deflection angle of light. The material of this transparent flat lens can be transparent glass or transparent plastic, etc.

[0058] In an exemplary embodiment, the following condition can be satisfied: 0°≤θ≤2°, where the deflection angle of the transparent flat lens in the deflection state is θ. Satisfying 0°≤θ≤2° and controlling the range of values ​​for the deflection angle θ of the transparent flat lens in the deflection state facilitates precise control of the light propagation direction, thereby enabling the transparent flat lens to control the deflection angle of the light. Specifically, the larger the deflection angle θ, the more pronounced the image height change will be; that is, both the edge field-of-view image height change ΔIHc and the center field-of-view image height change ΔIHe will be larger, and the greater the difference between the edge field-of-view image height change ΔIHc and the center field-of-view image height change ΔIHe.

[0059] In an exemplary embodiment, the following condition can be satisfied: ΔIHc = (1 - n0 / n1) * θ1 * t, where, when the transparent flat lens switches from the initial state to the deflection state, the change in the center field-of-view image height of the lens module is ΔIHc, the incident angle of the edge field-of-view beam into the transparent flat lens is θ1, the refractive index of the medium before incident is n0, and the refractive index and thickness of the transparent flat lens after incident are n1 and t, respectively. Since ΔIHc = (1 - n0 / n1) * θ1 * t is satisfied, the change in the center field-of-view image height ΔIHc of the lens module can be controlled based on the incident angle θ1 of the edge field-of-view beam into the transparent flat lens when the transparent flat lens switches from the initial state to the deflection state, the refractive index n0 of the medium before incident, the refractive index n1 of the transparent flat lens after incident, and the thickness t.

[0060] In an exemplary embodiment, the transparent flat lens deflects N times in each cycle, where N satisfies: 1 <N<20。

[0061] In one exemplary embodiment, N=4. The transparent flat lens deflects four times in each cycle to enter the initial state and three deflection states, causing the lens module to generate a reference image and three displacement images on the imaging surface IMG. These three displacement images are offset relative to the reference image in three specific directions; for example, the first displacement image is offset horizontally relative to the reference image, the second displacement image is offset vertically relative to the reference image, and the third displacement image is offset diagonally relative to the reference image. Thus, light rays form the reference image and three displacement images on the imaging surface IMG in different directions. These four images differ in detail. The photosensitive chip in the camera module can process and stitch together the reference image and the three displacement images to synthesize a high-pixel image. Compared to either the reference image or any one of the three displacement images, the high-pixel image has a fourfold increase in pixel count, significantly improving shooting performance.

[0062] In one exemplary embodiment, when N=4 and the transparent flat lens is in the deflection state, the lens module will shift the image height by 0.3p~0.7p, where p is the image pixel size. The transparent flat lens deflects 4 times in each cycle to enter the initial state and 3 deflection states, allowing the lens module to generate a reference image and 3 displacement images on the imaging surface IMG. When the transparent flat lens switches to the deflection state, controlling the transparent flat lens to deflect at a preset angle can shift the image height of the lens module by 0.3p~0.7p, making the difference in detail between the displacement images and the reference image more obvious. Therefore, the photosensitive chip in the camera module can process and stitch together the reference image and 3 displacement images to obtain a high-pixel image that is closer to the captured image. Compared to the reference image or any one of the 3 displacement images, the high-pixel image has 4 times more pixels, significantly improving shooting performance.

[0063] In an exemplary embodiment, the following can be satisfied: x = EFL / (y / 43.3 * f), and 2 < x < 20; where, the lens magnification of the lens module is x, the focal length is EFL, the holographic height is y, and the main camera equivalent focal length is f. The lens magnification x refers to the ratio of the equivalent focal length of the current lens to the main camera equivalent focal length f; the equivalent focal length of the current lens is the focal length value after normalizing the focal length EFL to the 35mm full-frame format; the main camera equivalent focal length f is the equivalent focal length of the main camera, based on the 35mm full-frame format; and the diagonal length of the 35mm full-frame sensor (the diagonal size of the 36mm × 24mm format) is 43.3mm. The holographic height y is 2 times the maximum image height, that is, the height covering the entire effective imaging area, and can be approximately equal to the diagonal length of the image sensor target surface. Satisfying x = EFL / (y / 43.3 * f) and 2 < x < 20, according to the focal length EFL, the holographic height y, and the main camera equivalent focal length f, the lens magnification x of the lens module can be controlled, and the lens magnification x can be prevented from being too small, which may cause too large a difference between the central field image height change ΔIHc and the peripheral field image height change ΔIHe, and it is difficult to complete the subsequent image stitching. The size of the imaging circle MIC can be set according to the size of the holographic height y. The main camera equivalent focal length f is usually taken between 23mm and 25mm. The larger the lens magnification x, if the deviation between the central field image height change ΔIHc and the peripheral field image height change ΔIHe is smaller, the more accurate the subsequent image stitching will be.

[0064] In an exemplary embodiment, as Figures 3 to 6 shown, the following can be satisfied: 0.1mm ≤ d1 ≤ 2mm; where, the thickness of the beam deflection device 20 is d1. Satisfying 0.1mm ≤ d1 ≤ 2mm and controlling the size of the thickness d1 of the beam deflection device 20 can control the size of the image height change. The beam deflection device 20 is exemplified to Figure 3 and Figure 4 set the thickness d1 to be smaller, and be in the initial state in Figure 3 and be in the deflected state in Figure 4 ; the beam deflection device 20 is exemplified to Figure 5 and Figure 6 set the thickness d1 to be larger, and be in the initial state in Figure 5 and be in the deflected state in Figure 6 ; as Figures 3 to 6 shown, when the beam deflection device 20 switches from the initial state to the deflected state, the larger the thickness d1 of the beam deflection device 20 is set, at the same deflection angle, the larger the image height change is, that is, both the central field image height change ΔIHc and the peripheral field image height change ΔIHe are larger.

[0065] It should be noted that this application is not limited to the beam deflection device 20 being a transparent flat lens. The beam deflection device 20 can also be a tunable lens or other structural shapes, capable of multiple deflections, and can be used to image light on the imaging surface IMG in different directions. All of these fall within the protection scope of this application.

[0066] In an exemplary implementation, such as Figure 7 As shown, the beam deflection device 20 is a tunable lens, which includes a first transparent plate 21, a second transparent plate 22, and a deformable medium 23 disposed between the first transparent plate 21 and the second transparent plate 22. When the beam deflection device 20 enters the initial state, the first transparent plate 21 and the second transparent plate 22 are parallel to each other, so that the beam deflection device 20 is in a plate shape. When the beam deflection device 20 is in a deflection state, the first transparent plate 21 and / or the second transparent plate 22 deflect and squeeze the deformable medium 23, so that the beam deflection device 20 is in a wedge shape.

[0067] In an exemplary embodiment, the deformable medium 23 can be a liquid or an elastically compressible solid. Specifically, the liquid can be liquid crystal, oil, water, or a mixture of the above substances, and the solid can be silicone resin, polymer gel, etc.

[0068] In one exemplary implementation, such as Figure 7 As shown, the beam deflection device 20 includes at least one set of piezoelectric sheets 24 and pressure blocks 25 connected together. The pressure blocks 25 are fixedly disposed on the first transparent plate 21 or the second transparent plate 22. Generally, the pressure blocks 25 are disposed on the outer surface of the first transparent plate 21 away from the second transparent plate 22 and / or on the outer surface of the second transparent plate 22 away from the first transparent plate 21. The piezoelectric sheets 24 extend, contract, or bend according to the received drive signal and drive the pressure blocks 25, causing the first transparent plate 21 or the second transparent plate 22 connected to the pressure blocks 25 to deflect.

[0069] In one exemplary embodiment, such as Figure 8As shown, the piezoelectric sheet 24 includes a first piezoelectric ceramic sheet 241, a second piezoelectric ceramic sheet 242, and a metal substrate 243. The first and second piezoelectric ceramic sheets 241 and 242 are arranged along the same polarization direction and are tightly adhered to both sides of the metal substrate 243. The piezoelectric sheet 24 has a fixed non-driven region without inverse piezoelectric effect and a driven region with inverse piezoelectric effect. The non-driven region of the piezoelectric sheet 24 is connected to the driving block 25. The fixed non-driven region of the piezoelectric sheet 24 is provided with a first electrode point 244, a second electrode point 245, and a third electrode point 246. The first electrode point 244 is located on the side of the first piezoelectric ceramic sheet 241 away from the metal substrate 243, the second electrode point 245 is located on the side of the second piezoelectric ceramic sheet 242 away from the metal substrate 243, and the third electrode point 246 is electrically connected to the metal substrate 243. During driving, the circuit or circuit board applies a voltage to the three electrode points respectively. Figure 8 As an example, but not limited to, a +V positive constant voltage is applied to the first electrode point 244, a 0V constant voltage is output from the second electrode point, and a driving voltage between 0V and the +V positive constant voltage is applied to the third electrode point 246 to control the bending of the piezoelectric sheet 24. According to the inverse piezoelectric effect, the first piezoelectric ceramic sheet 241 and the second piezoelectric ceramic sheet 242 will undergo slight deformation, i.e., elongation or shortening, depending on the applied voltage. When the deformation amounts of the two are different, the piezoelectric sheet 24 will bend, thereby causing the pressure block 25 to deviate from its original position, causing the first transparent plate 21 or the second transparent plate 22 connected to the pressure block 25 to deflect.

[0070] In another exemplary embodiment, such as Figure 9 As shown, the beam deflection device 20 includes at least one set of connected drive lines 26 and piezoelectric elements 27. The piezoelectric elements 27 are fixedly disposed on the first transparent plate 21 or the second transparent plate 22. Generally, the piezoelectric elements 27 are disposed on the outer surface of the first transparent plate 21 away from the second transparent plate 22 and / or on the outer surface of the second transparent plate 22 away from the first transparent plate 21. The piezoelectric elements 27 receive drive signals through the drive lines 26 to extend or retract, thereby driving the first transparent plate 21 or the second transparent plate 22 to deflect.

[0071] Specifically, such as Figure 10 In the example, the beam deflection device 20 is a tunable lens. When the beam deflection device 20 enters its initial state, the first transparent plate 21 and the second transparent plate 22 are parallel to each other, so that the beam deflection device 20 is in a plate shape. Figure 11 In the example, the beam deflection device 20 is a tunable lens. When the beam deflection device 20 is in the deflection state, the first transparent plate 21 deflects and compresses the deformable medium 23, so that the beam deflection device 20 is wedge-shaped. Figure 10 and Figure 11As shown, when the beam deflection device 20 switches from the initial state to the deflection state, the light rays are deflected accordingly. Specifically, the light rays that originally hit the center of the pixel on the imaging surface IMG, represented by the solid line, are deflected to the edge of the pixel and do not participate in imaging. The light rays that originally hit the edge of the pixel on the imaging surface IMG, represented by the dashed line, are deflected to the center of the pixel and participate in imaging. As a result, the displacement image recorded by the imaging chip will have slight differences from the reference image. By aligning and synthesizing the reference image and the displacement image through an algorithm, a high-resolution high-pixel image can be obtained. Ultimately, the imaging quality is higher than that of an imaging chip with the same sample pixel size, small pixel dimensions, and high pixel count.

[0072] In an exemplary embodiment, the beam deflection device 20 is driven by a voice coil motor, a piezoelectric controller, or a microelectromechanical system (MEMS). For example, a voice coil motor (VCM) works by changing the magnitude of the direct current in the coil within a permanent magnetic field, thereby generating different magnitudes of magnetic repulsive force. This controls the stretching position of the spring plate, which in turn drives the component supported by the spring plate to move up and down or deflect. VCMs are currently widely used in the lens drive of mobile phone cameras. In this exemplary embodiment, the beam deflection device 20 is housed within the voice coil motor, which drives the beam deflection device 20 to deflect.

[0073] In an exemplary embodiment, the following condition can be met: 8°≤FOV≤40°, where the field of view of the lens module is the FOV. By satisfying 8°≤FOV≤40°, the field of view (FOV) of the lens module is controlled within a reasonable range, which allows for a reasonable match between the lens magnification and the image sensor. When the focal length is large, the FOV is small, which can avoid excessive lens design margin; when the focal length is small, the FOV is large, which can avoid image cropping or vignetting.

[0074] In an exemplary embodiment, the imaging lens 10 also includes a stop. The stop may be located, for example, near the object side of the first lens L1 of the imaging lens 10, where the first lens L1 is the first lens closest to the image side among the plurality of lenses in the imaging lens 10. The stop may also be located at other positions, such as in front of the object side of the second lens L2 of the imaging lens 10, or on the image side of the fourth lens L4 of the imaging lens 10, and so on.

[0075] In an exemplary embodiment, the imaging lens 10 may include at least three lenses, such as three, four, or five. The lens material may be glass, plastic, or a glass-plastic hybrid. However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application.

[0076] In an exemplary embodiment, the lens module further includes a prism P1 disposed between the imaging lens 10 and the beam deflection device 20. The prism P1 can bend the converged light beam at an angle, such as 90°, which can be used to fold the optical system, compress the length of the optical system, and thus shorten the height of the lens module.

[0077] In an exemplary embodiment, prism P1 includes an incident surface, a reflecting surface, and an exit surface, with the exit surface of prism P1 positioned opposite to the imaging surface IMG. When the exit surface of prism P1 is positioned opposite to the imaging surface IMG, light rays emitted from the exit surface can form an image upon reaching the imaging surface IMG, reducing the interaction of light rays with other optical elements or structures in the propagation path, such as avoiding diffraction phenomena caused by multiple reflections or refractions. This effectively reduces light scattering and interference effects, resulting in clearer and sharper imaging, and improving image quality and resolution.

[0078] In an exemplary embodiment, the lens module further includes an IR filter for correcting color deviation and / or a protective glass for protecting the imaging chip located on the imaging surface IMG.

[0079] In an exemplary embodiment, this application also provides a camera module, which includes the lens module described above. The imaging surface (IMG) of the lens module is disposed on the photosensitive surface of the imaging chip; the imaging chip processes and synthesizes a high-resolution image based on a reference image and N displacement images.

[0080] Figure 12 A high-resolution schematic diagram of an imaging image according to an embodiment of this application is shown. For example... Figure 12 As shown, any region of this high-pixel schematic contains multiple G1, G2, G3, and G4 pixels that differ slightly in direction due to variations in image detail. This results in a high pixel count and a 4-fold increase in resolution. However, this high-pixel schematic cannot achieve the same level of detail in any region through a single imaging process. This application addresses this by using a beam deflection device 20 to deflect the beam N times in each cycle to enter an initial state and N-1 deflection states. This allows the lens module to generate a reference image and N-1 displacement images on the imaging surface, thereby obtaining the G1, G2, G3, and G4 pixels that differ slightly in direction due to variations in image detail.

[0081] Figures 13A to 13D This diagram illustrates the pixels of four images sampled from an imaging chip according to one embodiment of this application. Figures 13A to 13D As shown, Figure 13A As the reference image, Figure 13B For the first displacement image, Figure 13C For the second displacement image, Figure 13D This is the third displacement image. Figure 13A Example baseline images may include multiple G1 pixels. Figure 13B The example first displacement image may include multiple G2 pixels. Figure 13C The second displacement image in the example may include multiple G3 pixels. Figure 13D The third displacement image in the example may include multiple G4 pixels. Here, G1, G2, G3, and G4 pixels do not represent pixels of specific colors, but only indicate that each image has corresponding pixels in each region. Since the reference image and the three displacement images are imaged on the imaging plane IMG along different directions, the G1, G2, G3, and G4 pixels will vary slightly due to differences in image details.

[0082] Figures 14A to 14D This illustration shows a pixel diagram of how the imaging chip processes and synthesizes a high-pixel image in one embodiment of this application, affecting image resolution. For example... Figures 14A to 14D As shown, Figure 14A Example based on Figure 13A The reference image yields an unoffset image. Figure 14B Example based on Figure 13B The first displacement image and Figure 14A The first intermediate image is obtained by processing and synthesizing the sub-images. Figure 14C Example based on Figure 13C The second displacement image and Figure 14B The first intermediate image is processed and synthesized to obtain the second intermediate image. Figure 14D Example based on Figure 13D The third displacement image and Figure 14C The second intermediate image processing synthesizes a high-resolution image. From Figure 14D It can be seen that the number of pixels in the high-pixel image is 4 times that of the reference image or any displacement image, and the differences in details of each image have been stitched together, resulting in a high resolution image that can be used to obtain high-resolution images when taking pictures.

[0083] The implementation of this camera module can be found in the embodiment of the lens module, and the repetitions will not be repeated.

[0084] Based on the same inventive concept, the electronic device according to the exemplary embodiments of this application includes the camera module described above. The electronic device includes, but is not limited to, smartphones, tablets, laptops, gimbal cameras, surveillance cameras, and other imaging devices. Implementations of this electronic device can refer to embodiments of the camera module; repeated details will not be elaborated further.

[0085] However, those skilled in the art will understand that the number of lenses constituting the imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although four lenses are described as an example in the following embodiments, the optical imaging lens is not limited to including four lenses. If desired, the imaging lens may also include other numbers of lenses.

[0086] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the lens module applicable to the above-described embodiments.

[0087] Example 1 The following is for reference Figure 15 The lens module according to Embodiment 1 of this application is described. Figure 15 A cross-sectional schematic diagram of the lens module of Embodiment 1 of this application is shown.

[0088] The lens module of Embodiment 1 includes an imaging lens 10 and a beam deflection device 20; the beam deflection device 20 deflects N times in each cycle to enter the initial state and N-1 deflection states, so that the lens module generates a reference image and N-1 displacement images on the imaging surface IMG. The N-1 displacement images are offset relative to the reference image in a specific N-1 direction, where N≥2 and N is an integer.

[0089] In one embodiment, the imaging lens 10 and the beam deflection device 20 are arranged sequentially from the object side to the image side along the optical axis. In another embodiment, the beam deflection device 20 and the imaging lens 10 are arranged sequentially from the object side to the image side along the optical axis.

[0090] In one embodiment, the beam deflection device 20 is a transparent flat plate lens, which is flat in shape.

[0091] In this embodiment, the beam deflection device 20 can be set with a thickness d1=0.50mm, as shown in Table 1.

[0092] In one embodiment, the imaging lens 10 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side.

[0093] In one embodiment, the first lens L1 has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a convex object-side surface and a convex image-side surface. The third lens L3 has negative optical power, with a concave object-side surface and a concave image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a concave image-side surface.

[0094] In one embodiment, the imaging lens 10 may be provided with a stop, which may be located near the object side of the first lens L1 of the imaging lens 10.

[0095] Light from the object is transmitted sequentially through the first lens L1 to the fourth lens L4 and the object side and image side of the beam deflection device 20, and finally imaged on the imaging surface IMG.

[0096] Table 1 shows the basic parameters of the lens module in Embodiment 1, where the units for radius, thickness, and half-aperture are all millimeters.

[0097] Table 1:

[0098] Wherein, S1 represents the stop, S2 represents the object-side surface of the first lens L1, S3 represents the image-side surface of the first lens L1, S4 represents the object-side surface of the second lens L2, S5 represents the image-side surface of the second lens L2, S6 represents the object-side surface of the third lens L3, S7 represents the image-side surface of the third lens L3, S8 represents the object-side surface of the fourth lens L4, S9 represents the image-side surface of the fourth lens L4, S10 represents the object-side surface of the beam deflection device 20, S11 represents the image-side surface of the beam deflection device 20, and IMG represents the imaging plane.

[0099] Among them, the object-side surface and image-side surface of any one of the first lens L1 to the fourth lens L4 can both be even-order aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical formula:

[0100] Where Z represents the height along the optical axis, c is the reciprocal of the surface radius, k is the conic coefficient, and r is the aperture along the radial direction; α represents the aspherical coefficient, α1 represents the aspherical coefficient A2, α2 represents the aspherical coefficient A4, and so on. Table 2 shows the higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical mirror surface that can be used in the imaging lens 10 of Embodiment 1, from the first lens L1 to the fourth lens L4.

[0101] Table 2:

[0102] Table 3 shows the relevant parameters of the size and offset of the center image height and edge image height of the lens module when the beam deflection device 20 is in the deflection state at different deflection angles θ in Embodiment 1.

[0103] Table 3:

[0104] As shown in Table 3, the larger the deflection angle θ of the beam deflection device 20, the more obvious the change in the image height of the lens module, that is, both the change in the image height ΔIHc in the peripheral field of view and the change in the image height ΔIHe in the central field of view are larger, and the difference between the change in the image height ΔIHc in the peripheral field of view and the change in the image height ΔIHe in the central field of view is greater.

[0105] In Embodiment 1, the focal length EFL of the lens module is 5.70 mm, the aperture Fno is 2.20, the full image height y is 2 * 1595.15 / 1000 = 3.19 mm, the main camera equivalent focal length f is 24 mm, and the lens magnification x is EFL / (y / 43.3 * f) = 3.22, which satisfies the relational expression: x = EFL / (y / 43.3 * f), and 2 < x < 20. The thickness d1 of the beam deflection device 20 is 0.50 mm. When the deflection angle θ of the beam deflection device 20 is 0.50°, the change in the image height ΔIHc in the central field of view of the lens module is 1.49 μm, the change in the image height ΔIHe in the peripheral field of view is 1.76 μm, and the lens magnification x is 3.22, then ΔIHe / ΔIHc / x = 0.37, which satisfies the relational expression 0.05 < ΔIHe / ΔIHc / x < 0.8.

[0106] Example 2 The following refers to Figure 16 Describe the lens module according to Embodiment 2 of the present application. Figure 16 Fig. shows a cross-sectional schematic view of the lens module according to Embodiment 2 of the present application. In Embodiment 2, for the sake of simplicity, some descriptions similar to those in Embodiment 1 will be omitted.

[0107] The lens module of Embodiment 2 includes an imaging lens 10 and a beam deflection device 20; the beam deflection device 20 deflects N times in each cycle to enter the initial state and N - 1 deflection states, so that the lens module generates a reference image and N - 1 displacement images on the imaging surface IMG, and the N - 1 displacement images are offset relative to the reference image along specific N - 1 directions, where N ≥ 2 and N is an integer.

[0108] Among them, the imaging lens 10 and the beam deflection device 20 are arranged in sequence along the optical axis from the object side to the image side. In other embodiments, the beam deflection device 20 and the imaging lens 10 are arranged in sequence along the optical axis from the object side to the image side.

[0109] In this embodiment, the lens module further includes a prism P1, and the prism P1 is arranged between the imaging lens 10 and the beam deflection device 20.

[0110] In this embodiment, the beam deflection device 20 can be set with a thickness d1 = 0.40 mm, as shown in Table 4.

[0111] In one embodiment, the imaging lens 10 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side.

[0112] In one embodiment, the first lens L1 has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a convex object-side surface and a concave image-side surface. The third lens L3 has negative optical power, with a convex object-side surface and a concave image-side surface. The fourth lens L4 has negative optical power, with a convex object-side surface and a concave image-side surface.

[0113] In one embodiment, the stop stop may be positioned in front of the object side of the second lens L2 of the imaging lens 10.

[0114] Light from the object is transmitted sequentially through the first lens L1 to the fourth lens L4, as well as the object side and image side of the prism P1 and the beam deflection device 20, and finally imaged on the imaging plane IMG.

[0115] Table 4 shows the basic parameters of the lens module in Example 2, where the units for radius, thickness, and half-aperture are all millimeters.

[0116] Table 4:

[0117] Wherein, S1 represents the object-side surface of the first lens L1, S2 represents the image-side surface of the first lens L1, S3 represents the stop, S4 represents the object-side surface of the second lens L2, S5 represents the image-side surface of the second lens L2, S6 represents the object-side surface of the third lens L3, S7 represents the image-side surface of the third lens L3, S8 represents the object-side surface of the fourth lens L4, S9 represents the image-side surface of the fourth lens L4, S10 represents the object-side surface of the prism P1, S11 represents the image-side surface of the prism P1, S12 represents the object-side surface of the beam deflection device 20, S13 represents the image-side surface of the beam deflection device 20, and IMG represents the imaging plane.

[0118] Table 5 gives the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical mirror surface that can be used in the imaging lens 10 of Embodiment 2, from the second lens L2 to the fourth lens L4.

[0119] Table 5:

[0120] Table 6 shows the relevant parameters of the size and offset of the center image height and edge image height of the lens module when the beam deflection device 20 is in the deflection state at different deflection angles θ in Embodiment 2.

[0121] Table 6:

[0122] As shown in Table 6, the larger the deflection angle θ of the beam deflection device 20, the more obvious the change in the image height of the lens module. That is, both the change in the image height ΔIHc in the peripheral field of view and the change in the image height ΔIHe in the central field of view are larger, and the difference between the change in the image height ΔIHc in the peripheral field of view and the change in the image height ΔIHe in the central field of view is greater.

[0123] In Embodiment 2, the focal length EFL of the lens module is 32.80 mm, the aperture Fno is 3.79, the full image height y = 2 * 3575.13 / 1000 = 7.20 mm, the main camera equivalent focal length f is 24 mm, and the lens magnification x = EFL / (y / 43.3 * f) = 8.22, satisfying the relational expression: x = EFL / (y / 43.3 * f), and 2 < x < 20. The thickness d1 of the beam deflection device 20 is 0.40 mm. When the deflection angle θ of the beam deflection device 20 is 0.50°, the change in the image height ΔIHc in the central field of view of the lens module is 1.19 μm, the change in the image height ΔIHe in the peripheral field of view is 1.24 μm, and the lens magnification x = 8.22, then ΔIHe / ΔIHc / x = 0.13, satisfying the relational expression 0.05 < ΔIHe / ΔIHc / x < 0.8.

[0124] Example 3 The following refers to Figure 17 Describe the lens module according to Embodiment 3 of the present application. Figure 17 A cross-sectional schematic diagram of the lens module according to Embodiment 3 of the present application is shown. In Embodiment 3, for the sake of simplicity, some descriptions similar to those in Embodiment 2 will be omitted.

[0125] The lens module in Embodiment 2 includes an imaging lens 10 and a beam deflection device 20; the beam deflection device 20 deflects N times in each cycle to enter the initial state and N - 1 deflection states, so that the lens module generates a reference image and N - 1 displacement images on the imaging surface IMG, and the N - 1 displacement images are offset relative to the reference image along specific N - 1 directions, where N ≥ 2 and N is an integer.

[0126] Among them, the imaging lens 10 and the beam deflection device 20 are sequentially arranged along the optical axis from the object side to the image side. In other embodiments, the beam deflection device 20 and the imaging lens 10 are sequentially arranged along the optical axis from the object side to the image side.

[0127] In this embodiment, the aperture STOP can be arranged on the object side surface of the first lens L1 of the imaging lens 10.

[0128] In this embodiment, the beam deflection device 20 can be set with a thickness d1 = 0.30 mm, as shown in Table 7.

[0129] In one embodiment, the imaging lens 10 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side.

[0130] In one embodiment, the first lens L1 has positive optical power, with both its object-side and image-side surfaces being convex. The second lens L2 has positive optical power, with both its object-side and image-side surfaces being concave. The third lens L3 has negative optical power, with both its object-side and image-side surfaces being convex. The fourth lens L4 has negative optical power, with both its object-side and image-side surfaces being concave.

[0131] Light from the object is transmitted sequentially through the first lens L1 to the fourth lens L4, as well as the object side and image side of the prism P1 and the beam deflection device 20, and finally imaged on the imaging plane IMG.

[0132] Table 7 shows the basic parameters of the lens module in Example 3, where the units for radius, thickness, and half-aperture are all millimeters.

[0133] Table 7:

[0134] Wherein, S1 represents the object-side surface of the first lens L1, and the aperture stop STOP is set on the object-side surface of the first lens L1; S2 represents the image-side surface of the first lens L1; S3 represents the object-side surface of the second lens L2; ​​S4 represents the image-side surface of the second lens L2; ​​S5 represents the object-side surface of the third lens L3; S6 represents the image-side surface of the third lens L3; S7 represents the object-side surface of the fourth lens L4; S8 represents the image-side surface of the fourth lens L4; S9 represents the object-side surface of the prism P1; S10 represents the image-side surface of the prism P1; S11 represents the object-side surface of the beam deflection device 20; S12 represents the image-side surface of the beam deflection device 20; and IMG represents the imaging plane.

[0135] Table 8 gives the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical mirror surface that can be used in the imaging lens 10 of Embodiment 3, from the first lens L1 to the fourth lens L4.

[0136] Table 8:

[0137] Table 9 shows the relevant parameters of the size and offset of the center image height and edge image height of the lens module when the beam deflection device 20 is in the deflection state at different deflection angles θ in Embodiment 3.

[0138] Table 9:

[0139] As shown in Table 9, the larger the deflection angle θ of the beam deflection device 20, the more obvious the change in the image height of the lens module. That is, both the change in the image height ΔIHc of the peripheral field of view and the change in the image height ΔIHe of the central field of view are larger, and the difference between the change in the image height ΔIHc of the peripheral field of view and the change in the image height ΔIHe of the central field of view is greater.

[0140] In Embodiment 3, the focal length EFL of the lens module is 24.81 mm, the aperture Fno is 3.20, the full image height y = 2 * 3653.68 / 1000 = 7.31 mm, the main camera equivalent focal length f is 24 mm, the lens magnification x = EFL / (y / 43.3 * f) = 6.12, satisfying the relationship: x = EFL / (y / 43.3 * f), and 2 < x < 20. The thickness d1 of the beam deflection device 20 is 0.30 mm. When the deflection angle θ of the beam deflection device 20 is 0.50°, the change in the image height ΔIHc of the central field of view of the lens module is 1.19 μm, the change in the image height ΔIHe of the peripheral field of view is 1.24 μm, and the lens magnification x = 6.12. Then, ΔIHe / ΔIHc / x = 0.17, satisfying the relationship 0.05 < ΔIHe / ΔIHc / x < 0.8.

[0141] Example 4 The following refers to Figure 18 Describe the lens module according to Embodiment 4 of the present application. Figure 18 The cross-sectional schematic diagram of the lens module according to Embodiment 4 of the present application is shown. In Embodiment 4, for the sake of simplicity, some descriptions similar to those in Embodiment 3 will be omitted.

[0142] The lens module of Embodiment 4 includes an imaging lens 10 and a beam deflection device 20; the beam deflection device 20 deflects N times in each cycle to enter the initial state and N - 1 deflection states, so that the lens module generates a reference image and N - 1 displacement images on the imaging surface IMG. The N - 1 displacement images are offset relative to the reference image along N - 1 specific directions, N ≥ 2 and N is an integer.

[0143] Among them, the imaging lens 10 and the beam deflection device 20 are arranged in sequence along the optical axis from the object side to the image side. In other embodiments, the beam deflection device 20 and the imaging lens 10 are arranged in sequence along the optical axis from the object side to the image side.

[0144] In this embodiment, the aperture STOP can be arranged on the image side surface of the fourth lens L4 of the imaging lens 10.

[0145] In this embodiment, the beam deflection device 20 can be set with a thickness d1 = 0.21 mm, as shown in Table 10.

[0146] In one embodiment, the prism P1 includes an incident surface, a reflection surface, and an exit surface. The exit surface of the prism P1 is arranged opposite to the imaging surface IMG.

[0147] In one embodiment, the imaging lens 10 may include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged sequentially from the object side to the image side.

[0148] In one embodiment, the first lens L1 has positive optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has negative optical power, with a convex object-side surface and a concave image-side surface. The third lens L3 has negative optical power, with a convex object-side surface and a concave image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface.

[0149] Light from the object is transmitted sequentially through the first lens L1 to the fourth lens L4, as well as the object side and image side of the prism P1 and the beam deflection device 20, and finally imaged on the imaging plane IMG.

[0150] Table 10 shows the basic parameters of the lens module in Embodiment 4, where the units for radius, thickness, and half-aperture are all millimeters.

[0151] Table 10:

[0152] Wherein, S1 represents the object-side surface of the first lens L1, S2 represents the image-side surface of the first lens L1, S3 represents the object-side surface of the second lens L2, S4 represents the image-side surface of the second lens L2, S5 represents the object-side surface of the third lens L3, S6 represents the image-side surface of the third lens L3, S7 represents the object-side surface of the fourth lens L4, S8 represents the image-side surface of the fourth lens L4, and the stop STOP is set on the image-side surface of the fourth lens L4, S9 represents the object-side surface of the prism P1, S10 represents the image-side surface of the prism P1, S11 represents the object-side surface of the beam deflection device 20, S12 represents the image-side surface of the beam deflection device 20, and IMG represents the imaging plane.

[0153] Table 11 gives the higher-order coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical mirror surface that can be used in the imaging lens 10 of Embodiment 4, from the first lens L1 to the fourth lens L4.

[0154] Table 11:

[0155] Table 12 shows the relevant parameters of the size and offset of the center image height and edge image height of the lens module when the beam deflection device 20 is in the deflection state at different deflection angles θ in Embodiment 4.

[0156] Table 12:

[0157] As shown in Table 12, the larger the deflection angle θ of the beam deflection device 20, the more obvious the change in image height of the lens module, that is, the larger the change in image height ΔIHc of the edge field of view and the change in image height ΔIHe of the center field of view, and the greater the difference between the change in image height ΔIHc of the edge field of view and the change in image height ΔIHe of the center field of view.

[0158] In Example 4, the lens module has a focal length EFL = 12.30mm, an aperture Fno = 2.60, a full-image height y = 2 * 3610.00 / 1000 = 7.22mm, an equivalent focal length f of the main camera, and a lens magnification x = EFL / (y / 43.3 * f) = 3.07, satisfying the relationship: x = EFL / (y / 43.3 * f), and 2

Claims

1. A lens module, characterized in that, It includes an imaging lens (10) and a beam deflection device (20); the beam deflection device (20) deflects N times in each cycle to enter an initial state and N-1 deflection states, so that the lens module generates a reference image and N-1 displacement images on the imaging plane (IMG), and the N-1 displacement images are offset relative to the reference image in a specific N-1 direction, where N≥2 and N is an integer; When the beam deflection device (20) switches from the initial state to the deflection state, the image height change ΔIHc of the center field of view of the lens module, the image height change ΔIHe of the edge field of view, and the lens magnification x satisfy the relationship 0.05<ΔIHe / ΔIHc / x<0.

8.

2. The lens module according to claim 1, characterized in that, The imaging lens (10) and the beam deflection device (20) are arranged sequentially from the object side to the image side along the optical axis, or the beam deflection device (20) and the imaging lens (10) are arranged sequentially from the object side to the image side along the optical axis.

3. The lens module according to claim 1, characterized in that, The beam deflection device (20) is a transparent flat plate lens, which is flat in shape; When the imaging lens (10) and the transparent flat lens are arranged sequentially from the object side to the image side along the optical axis, the distance d2 between the center of the transparent flat lens and the imaging surface (IMG) satisfies: 0.3mm≤d2≤7mm; or, when the transparent flat lens and the imaging lens (10) are arranged sequentially from the object side to the image side along the optical axis, the distance d3 between the center of the transparent flat lens and the imaging lens (10) satisfies: 0.1mm≤d3≤3mm.

4. The lens module according to claim 3, characterized in that, The deflection angle θ of the transparent flat lens in the deflection state satisfies: 0°≤θ≤2°.

5. The lens module according to claim 3, characterized in that, When the transparent flat lens switches from the initial state to the deflection state, the image height change ΔIHc of the center field of view of the lens module, the incident angle θ1 of the edge field of view beam into the transparent flat lens, the refractive index n0 of the medium before incident, the refractive index n1 and the thickness t of the transparent flat lens after incident satisfy the following relationship: ΔIHc=(1-n0 / n1)*θ1*t.

6. The lens module according to claim 3, characterized in that, When N=4 and the beam deflection device (20) is in the deflection state, the lens module will shift the image height by 0.3p~0.7p, where p is the image pixel size.

7. The lens module according to claim 1, characterized in that, The lens module's magnification x, focal length EFL, full-image height y, and main camera equivalent focal length f satisfy the following relationship: x = EFL / (y / 43.3*f), and 2 <x<20。 8. The lens module according to claim 1, characterized in that, The beam deflection device (20) is a tunable lens, which includes a first transparent plate (21), a second transparent plate (22), and a deformable medium (23) disposed between the first transparent plate (21) and the second transparent plate (22). When the beam deflection device (20) enters the initial state, the first transparent plate (21) and the second transparent plate (212) are parallel to each other, so that the beam deflection device (20) is in a plate shape. When the beam deflection device (20) is in a deflection state, the first transparent plate (21) and / or the second transparent plate (22) deflect and squeeze the deformable medium (23), so that the beam deflection device (20) is in a wedge shape.

9. The lens module according to claim 8, characterized in that, The beam deflection device (20) includes at least one set of piezoelectric sheets (24) and pressure blocks (25) connected together. The pressure blocks (25) are fixedly disposed on the first transparent plate (21) or the second transparent plate (22). The piezoelectric sheets (24) extend or bend according to the received driving signal and drive the pressure blocks (25) to deflect the first transparent plate (21) or the second transparent plate (22) connected to the pressure blocks (25).

10. The lens module according to claim 8, characterized in that, The beam deflection device (20) includes at least one set of driving circuits (26) and piezoelectric elements (27) connected together. The piezoelectric elements (27) are fixedly disposed on the first transparent plate (21) or the second transparent plate (22). The piezoelectric elements (27) receive driving signals through the driving circuits (26) to extend and retract, and drive the first transparent plate (21) or the second transparent plate (22) to deflect.

11. The lens module according to claim 1, characterized in that, The field of view (FOV) of the lens module satisfies: 8°≤FOV≤40°.

12. A camera module, characterized in that, It includes an imaging chip and a lens module as described in any one of claims 1 to 11; the imaging surface (IMG) of the lens module is disposed on the photosensitive surface of the imaging chip; The imaging chip processes and synthesizes a high-resolution image based on the reference image and the N-1 displacement images.

13. An electronic device, characterized in that, Includes the camera module as described in claim 12.

Images