Lens module and electronic device

Abstract

The application discloses a lens module and electronic equipment, and belongs to the technical field of electronic products. The lens module comprises, from the object side to the image side, a lens assembly, a prism, a filter and a photosensitive assembly arranged in sequence; the lens assembly comprises a plurality of lenses arranged along the optical axis direction; the prism comprises an incident surface, at least two reflecting surfaces and an exit surface; light enters the prism from the incident surface, is reflected by the at least two reflecting surfaces in sequence, and then exits from the exit surface to the imaging surface of the photosensitive assembly; wherein the lens assembly is arranged in a first region, the prism, the filter and the photosensitive assembly are arranged in a second region, the second region is lower than the first region in the height direction; and the height direction is parallel to the optical axis direction.

Description

Technical Field

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

[0002] With the technological advancements in smart electronic devices, users are placing increasingly higher demands on the photographic performance of these devices, especially in terms of telephoto shooting capabilities. Periscope lens modules, with their unique optical path folding structure, can achieve longer focal lengths within a limited device thickness, thus becoming the mainstream technology solution for high-magnification telephoto shooting in current smart electronic devices.

[0003] However, current rear-mounted folding periscope lenses typically require significant stacking space to meet imaging requirements, posing a considerable challenge to the utilization of internal space in electronic devices. Improving the optical architecture of the periscope lens to optimize the space occupied by the lens module while simultaneously achieving satisfactory imaging performance is a pressing technical problem that needs to be solved. Summary of the Invention

[0004] The purpose of this application is to provide a lens module and electronic device that can solve the problem of excessive space occupation by the lens module.

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

[0006] In a first aspect, embodiments of this application provide a lens module, including:

[0007] The lens assembly, prism, filter and photosensitive assembly are arranged sequentially from the object side to the image side;

[0008] The lens assembly includes a plurality of lenses arranged along the optical axis;

[0009] The prism includes an incident surface, at least two reflecting surfaces, and an exit surface; light enters the prism from the incident surface, is reflected sequentially by the at least two reflecting surfaces, and then exits from the exit surface onto the imaging surface of the photosensitive component;

[0010] The lens assembly is disposed in the first region, and the prism, the filter and the photosensitive assembly are disposed in the second region, which is lower than the first region in the height direction; the height direction is parallel to the optical axis direction.

[0011] Secondly, embodiments of this application provide an electronic device, including: a housing, and a lens module as described in the first aspect; wherein the housing includes a main body portion and a protruding portion protruding from the inside out, the protruding portion forming a receiving space for accommodating the lens module; wherein the first region is located within the protruding portion, and the second region is disposed within the main body portion.

[0012] In this embodiment, the lens assembly is disposed in the first region, while the prism, filter, and photosensitive component are disposed in the second region. The second region is lower than the first region in the height direction. This staggered arrangement, on the one hand, decomposes and folds the dimensional requirements of the optical path in the height direction to the horizontal direction, thus providing more back focal space for the telephoto lens, thereby increasing the equivalent focal length of the telephoto lens and achieving a greater magnification; on the other hand, moving the relatively large but height-constrained prism and photosensitive component to the second region within the main body of the device allows full utilization of the thickness margin inside the electronic device. This enables the lens assembly located in the first region to be housed within the lens protrusion of the electronic device housing, while the prism, filter, and photosensitive component are hidden inside the body. This structure reduces the overall footprint of the lens module in the lens protrusion area of ​​the electronic device's rear cover. Attached Figure Description

[0013] Figure 1 One of the schematic cross-sectional views of the lens module according to an embodiment of the present invention;

[0014] Figure 2 A second schematic diagram showing the cross-sectional structure of the lens module according to an embodiment of the present invention;

[0015] Figure 3 A schematic diagram illustrating the axial color difference in an embodiment of the present invention;

[0016] Figure 4 This diagram illustrates the defocusing of the Modulation Transfer Function (MTF) according to an embodiment of the present invention.

[0017] Figure 5 A schematic diagram of the housing of an electronic device according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 100-Lens assembly; 200-Prism; 210-Incident surface; 220-Reflecting surface; 221-First reflecting surface; 222-Second reflecting surface; 223-Third reflecting surface; 230-Outgoing surface; 300-Filter; 400-Photosensitive component; 500-Optical element; S-Light ray; Q1-First region; Q2-Second region; 600-Protrusion; 700-Housing. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] The lens module provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0023] Please refer to Figures 1 to 2 This invention provides a lens module, comprising: a lens assembly 100, a prism 200, a filter 300, and a photosensitive component 400 arranged sequentially from the object side to the image side. The lens assembly 100 includes multiple lenses arranged along the optical axis to converge light rays S. The prism 200, as a core component for optical path deflection, includes an incident surface 210, at least two reflecting surfaces 220, and an exit surface 230. Light rays S enter the prism 200 from the incident surface 210, are reflected sequentially by the at least two reflecting surfaces 220, and exit from the exit surface 230 onto the imaging surface of the photosensitive component 400. The lens assembly 100 is located in a first region Q1, and the prism 200, filter 300, and photosensitive component 400 are located in a second region Q2. The second region Q2 is lower than the first region Q1 in the height direction, and the height direction is parallel to the optical axis.

[0024] It should be noted that the first region Q1 and the second region Q2 are not physical partitions, but rather two logical space regions divided along the height of the lens module. The first region Q1 is located at a higher position and mainly houses the lens assembly 100; the second region Q2 is located at a lower position and mainly houses the prism 200, the filter 300, and the photosensitive component 400.

[0025] The filter 300 is made of flat glass, with an AR anti-reflection coating and an IR cut-off coating coated on its surface to filter near-infrared light. The photosensitive element 400, also known as the imaging surface, is the light receiver; light from the object is refracted by the imaging lens and imaged onto the chip.

[0026] In this embodiment, the lens assembly 100 is disposed in the first region Q1, while the prism 200, filter 300, and photosensitive assembly 400 are disposed in the second region Q2. In the height direction (i.e....) Figure 1 In the Z-direction of the image, the second region Q2 is lower than the first region Q1. This staggered layout, on the one hand, decomposes and folds the size requirements of the optical path in the height direction to the horizontal direction, leaving more back focal space for the telephoto lens, thereby increasing the equivalent focal length of the telephoto lens and achieving a greater magnification; on the other hand, it can move the relatively large but height-limited prism 200 and photosensitive component 400 to the second region located inside the main body of the device, making full use of the vertical space (i.e., the thickness direction of the electronic device) inside the electronic device, so that the lens assembly 100 located in the first region can be completely housed in the lens protrusion of the electronic device housing, while the prism 200, filter 300 and photosensitive component 400 are hidden inside the body. This structure can reduce the overall occupation of the lens module on the back cover protrusion area of ​​the electronic device.

[0027] In some embodiments of this application, the filter 300 and the photosensitive component 400 are spaced apart from the incident surface 210 in the height direction.

[0028] For example, such as Figure 1 and 2 In this design, the distance between the highest point of the filter 300 and the photosensitive component 400 in the height direction and the incident surface 210 is B. That is, the space represented by distance B is the vertical space saved. In other words, due to the existence of distance B, the filter 300 and the photosensitive component 400 can be moved downwards and arranged in the space below the incident surface 210, achieving further optimization of the lens module size.

[0029] In some embodiments of this application, such as Figures 1 to 2 In the prism 200, at least two reflecting surfaces 220 include a first reflecting surface 221, a second reflecting surface 222, and a third reflecting surface 223. The propagation path of the light ray S within the prism 200 is as follows: it enters through the incident surface 210, is reflected sequentially by the first reflecting surface 221, the second reflecting surface 222, and the third reflecting surface 223, and finally exits from the exit surface 230. The second reflecting surface 222 forms an obtuse angle with the first virtual plane V, and the first reflecting surface 221 forms an acute angle with the first virtual plane V. The first virtual plane V is perpendicular to the optical axis. The third reflecting surface 223 forms an obtuse angle with the first reflecting surface 221, and the third reflecting surface 223 forms an acute angle with the second reflecting surface 222.

[0030] When the incident surface 210 is a plane, the first virtual plane V is the incident surface 210.

[0031] In this embodiment, to achieve effective folding of the optical path within a limited space, a first virtual plane perpendicular to the optical axis is defined; the second reflecting surface 222 forms an obtuse angle with the first virtual plane V, while the first reflecting surface 221 forms an acute angle with the first virtual plane V; the third reflecting surface 223 forms an obtuse angle with the first reflecting surface 221 and an acute angle with the second reflecting surface 222. This embodiment causes the light ray S to undergo multiple directional changes within the prism 200, folding and decomposing the optical path, which originally required a relatively long Z-axis distance, into a first direction (i.e., the X-axis in the figure). This not only compresses the size of the lens module in the horizontal direction but also reduces its size in the vertical direction, which is beneficial for making full use of the limited space inside the electronic device.

[0032] In some embodiments of this application, the lens in the lens assembly 100 is an aspherical lens or a spherical lens.

[0033] For example, such as Figure 1 In the middle, the front lens assembly 100 includes four aspherical lenses, namely the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4.

[0034] Optionally, the aspherical surface used is an even-order aspherical surface, and its surface shape satisfies the following equation (1):

[0035] ; (1)

[0036] In the above equation (1), parameter c = 1 / R, which is the curvature corresponding to the radius of curvature R of the optical surface; r is the vertical distance from a point on the optical surface to the optical axis; z represents the sag of the point along the optical axis; k is the quadratic surface coefficient of the surface; and Ai represents the i-th order aspherical coefficient.

[0037] Table 1 below lists the surface type, radius of curvature, thickness, refractive index, and Abbe number of each lens in the lens assembly 100.

[0038] Table 1

[0039]

[0040] Tables 2 to 4 below show the aspherical higher-order coefficients of each lens surface in the lens assembly 100.

[0041] Table 2

[0042]

[0043] Table 3

[0044]

[0045] Table 4

[0046]

[0047] In some embodiments of this application, the first reflective surface 221 and the second reflective surface 222 are along a first direction (i.e. Figure 1 Arranged in the X direction, with the first direction perpendicular to the optical axis (i.e., Figure 1 (Z-direction); wherein, the projection length of the first region Q1 in the first direction is less than the projection length of the second region Q2 in the first direction.

[0048] For example, such as Figures 1 to 2 In this configuration, the lens assembly 100 is vertically stacked along the optical axis, and its width in the first direction is relatively narrow, mainly limited by the lens aperture. The prism 200, filter 300, and photosensitive assembly 400 extend further in the first direction to accommodate the folded optical path. Therefore, the projected length of the lens assembly 100 in the first direction is less than the total projected length of the prism 200, filter 300, and photosensitive assembly 400 in the first direction. In this layout, the lens assembly 100, as the main component contributing to height, maintains a small horizontal width, which helps reduce the lateral footprint of the lens module on the device's edges or protrusions. The prism 200 can utilize the ample horizontal space inside the electronic device's body to extend the optical path. This design allows the module to achieve high-magnification telephoto imaging within a limited body thickness by extending horizontally (i.e., in the X-direction) to gain optical back focal length, thereby achieving high-magnification telephoto imaging without significantly increasing body thickness or protrusion width.

[0049] In some embodiments of this application, the filter 300 is disposed between the exit surface 230 of the prism 200 and the photosensitive component 400, and the filter 300 is perpendicular to the light emission direction.

[0050] Specifically, after the light beam S exits through the exit surface 230 of the prism 200, it directly and perpendicularly enters the surface of the filter 300, and then strikes the photosensitive element 400. In this arrangement, the extension surface of the filter 300 is arranged parallel to the photosensitive surface of the photosensitive element 400.

[0051] In some embodiments of this application, the incident surface 210 is a plane; or, the incident surface 210 is a spherical surface with optical power; or, the incident surface 210 is an aspherical surface with optical power.

[0052] Optical power is used to characterize the refractive power of a lens or optical element for an incident parallel beam of light. It should be noted that using an optical power surface on the incident surface 210 is beneficial for the overall internal focusing of the lens, which can improve macro performance and reduce system height in situations with limited space.

[0053] like Figure 1 In the middle, the incident surface 210 is a plane. Figure 1 The axial chromatic aberration of the lens module shown is as follows: Figure 3 As shown, Figure 4 The image shown is the MTF defocus plot. The five solid lines in the chromatic aberration plot represent wavelengths of light at 656nm, 587nm, 546nm, 486nm, and 435nm, respectively. It can be seen that the axial chromatic aberration of the lens in this embodiment is controlled within a very small range, and the chromatic aberration convergence is good. The MTF defocus plot also shows that at a spatial frequency of 89 lp / mm, the MTF across the entire field of view is greater than 0.6, indicating extremely high resolution.

[0054] In some alternative embodiments, the lens module further includes an optical element 500, which is attached to the incident surface of the prism 200, and the surface of the optical element 500 facing the object side has optical power.

[0055] In some alternative embodiments, the light-incident surface of the prism 200 has optical power, and the optical power surface forms the incident surface 210.

[0056] In this embodiment, the prism 200 serves as a rear-mounted anti-reflection functional component. The incident surface of the prism 200 can be a plane or a spherical or aspherical surface with optical power. This optical power surface can be on the prism 200 itself or attached as a separate surface to the incident plane of the prism 200.

[0057] Furthermore, this application embodiment also provides an electronic device, including a housing and a lens module as described above; wherein, the housing 700 includes a main body portion and a protruding portion 600 protruding from the inside out, the protruding portion 600 forming a receiving space for accommodating the lens module; wherein, a first region Q1 is located within the protruding portion 600, and a second region Q2 is disposed within the main body portion.

[0058] like Figure 5 The diagram shows a protrusion 600 in the electronic device housing 700 for accommodating a lens module.

[0059] The layout in this embodiment makes full use of the internal space of the electronic device. The greater height of the lens assembly 100 is accommodated by the lens protrusion 600, while the rear components such as the prism 200 are arranged within the thickness of the main body. This not only reduces the perceived height and area of ​​the camera protrusion, improving the structural compactness of the device, but also avoids interference of the prism 200 with the battery or other motherboard components.

[0060] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0061] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A lens module, characterized by, include: The lens assembly, prism, filter and photosensitive assembly are arranged sequentially from the object side to the image side; The lens assembly includes a plurality of lenses arranged along the optical axis; The prism includes an incident surface, at least two reflecting surfaces, and an exit surface; light enters the prism from the incident surface, is reflected sequentially by the at least two reflecting surfaces, and then exits from the exit surface onto the imaging surface of the photosensitive component; The lens assembly is disposed in the first region, and the prism, the filter and the photosensitive assembly are disposed in the second region, which is lower than the first region in the height direction; the height direction is parallel to the optical axis direction.

2. The lens module according to claim 1, wherein, The filter and the photosensitive component are spaced apart from the incident surface in the height direction.

3. The lens module according to claim 1, characterized in that, The at least two reflecting surfaces include a first reflecting surface, a second reflecting surface, and a third reflecting surface; The propagation path of light within the prism is as follows: it enters through the incident surface, is reflected sequentially by the first reflecting surface, the second reflecting surface, and the third reflecting surface, and finally exits from the exiting surface. Wherein, the second reflective surface and the first virtual plane form an obtuse angle, and the first reflective surface and the first virtual plane form an acute angle; wherein, the first virtual plane is perpendicular to the optical axis direction; The third reflective surface forms an obtuse angle with the first reflective surface, and the third reflective surface forms an acute angle with the second reflective surface.

4. The lens module according to claim 3, characterized in that, The first reflective surface and the second reflective surface are arranged along a first direction, which is perpendicular to the optical axis. Wherein, the projection length of the first region in the first direction is less than the projection length of the second region in the first direction.

5. The lens module according to claim 1, characterized in that, The filter is disposed between the exit surface of the prism and the photosensitive component, and the filter is perpendicular to the light exit direction.

6. The lens module according to claim 1, characterized in that, The incident surface is a plane; or... The incident surface is a spherical surface with optical power; or, The incident surface is an aspherical surface with optical power.

7. The lens module according to claim 1, characterized in that, The lens module also includes an optical element, which is attached to the incident surface of the prism, and the surface of the optical element facing the object has optical power.

8. The lens module according to claim 1, characterized in that, The surface of the prism on the light-incident side has optical power, and the surface with optical power forms the incident surface.

9. The lens module according to claim 1, characterized in that, The lens is either an aspherical lens or a spherical lens.

10. An electronic device, characterized in that, Includes a housing and a lens module as described in any one of claims 1 to 9; The housing includes a main body and a protruding part that protrudes from the inside out, the protruding part forming a receiving space for accommodating the lens module; The first region is located within the protruding portion, and the second region is located within the main body portion.

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