Lens module, camera and electronic equipment

Abstract

The embodiment of the invention discloses a lens module, a camera and electronic equipment, and relates to the field of optical imaging. The objective of the invention is to enable the lens to have a large light incoming amount under a large field angle. According to the specific scheme, the lens module comprises a lens assembly and a view field modulation element located on the object side of the lens assembly. The lens assembly is used for imaging and comprises a plurality of lenses with coaxial optical axes; wherein the imaging aperture of the field-of-view modulation element is SD; the distance between the image side surface of the field modulation element and the object side surface of the lens assembly is CD, and the half field angle of the lens module is HFOV; the entrance pupil diameter of the lens module is EPD; sDlt; (EPD + CD * tan (HFOV)). The field-of-view modulation element and the lens assembly meet the above formula, and the aberration of large-field-of-view imaging light can be reduced, so that the lens has a large light incoming amount under a large field-of-view angle. The lens assembly comprises a plurality of lenses which solve the problems of chromatic aberration, astigmatism, field curvature and the like.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical imaging technology, and in particular to a lens module, a camera, and an electronic device. Background Art

[0002] As electronic devices are upgraded, consumers are also demanding higher camera performance. As a key component that affects camera performance, the importance of lens performance is becoming increasingly prominent. For example, how to make the lens have a large amount of light entering at a large field of view has become an important performance to improve camera performance. Summary of the invention

[0003] The embodiments of the present application provide a lens module, a camera, and an electronic device, which are intended to allow the lens to have a large amount of light entering at a large field of view.

[0004] In order to achieve the above-mentioned purpose, this application adopts the following technical solution.

[0005] In the first aspect, an embodiment of the present application provides a lens module. The lens module includes a lens assembly and a field of view modulation element. The lens assembly is used for imaging, and the lens assembly includes a plurality of lenses with coaxial optical axes; the field of view modulation element is located on the object side of the lens assembly; wherein the imaging aperture of the field of view modulation element is SD; the distance between the image side surface of the field of view modulation element and the object side surface of the lens assembly is CD, and the half field of view angle of the lens module is HFOV; the entrance pupil diameter of the lens module is EPD; SD<(EPD+CD*tan(HFOV)). Thus, the field of view modulation element and the lens assembly satisfy the above formula, and the field of view modulation element can block part of the light with a larger deflection angle. Alternatively, the field of view modulation element can reduce the deflection angle of the light with a larger deflection angle, and can reduce the aberration of the light of the large field of view imaging, thereby improving the imaging quality and allowing the lens to have a large amount of light input at a large field of view angle. The lens assembly includes a plurality of lenses, and the plurality of lenses solve problems such as chromatic aberration, astigmatism, and field curvature.

[0006] In conjunction with the first aspect, in some achievable manners, the size of the lens assembly along the optical axis is LP, the effective focal length of the lens assembly is EFL, and CD / (LP*EFL)<0.9. A lens module that meets the above requirements is beneficial to the imaging quality of the lens assembly and reduces chromatic aberration.

[0007] In combination with the first aspect, in some achievable manners, the minimum distance between the lens with the largest Abbe number and the lens with the smallest Abbe number among the plurality of lenses is CTN, and the ratio of CTN to CD is less than 1. In this way, the field modulation element can block light with a large deflection angle or block part of the light with a large deflection angle, thereby improving the imaging quality of the lens module. In addition, the lens assembly has a small dispersion, thereby improving the imaging quality.

[0008] In conjunction with the first aspect, in some achievable manners, the half image height of the lens module is greater than 3 mm, so that the lens module can be ensured to have a larger field of view and light intake while having better image quality.

[0009] In combination with the first aspect, in some achievable manners, the Abbe number of at least two of the plurality of lenses is less than 30. In this way, the dispersion of the two lenses is better matched, and the aberration and light chromatic aberration can be better calibrated, further ensuring clear imaging.

[0010] In conjunction with the first aspect, in some achievable embodiments, the image side surface of the lens farthest from the field modulation element among the plurality of lenses has at least one inflection point. The inflection point helps to increase the image plane height and further correct the off-axis aberration of the lens module.

[0011] In combination with the first aspect, in some achievable ways, the lens closest to the field modulation element among the plurality of lenses is a first positive lens, and the object side surface of the first positive lens is a convex surface. Thus, the first positive lens has the function of converging light, so that the lens assembly has a better light converging ability, and the total optical path length of the lens assembly can be reduced. The object side surface of the first positive lens is convexly arranged toward the object surface, which is conducive to solving the problems of chromatic aberration, astigmatism or field curvature.

[0012] In combination with the first aspect, in some achievable manners, the field modulation element includes a second positive lens, the lens assembly has a focal length f1, the lens module has a focal length f2, and f1>f2. This is conducive to reducing the lens height of the lens module and reducing the space occupied by the lens module.

[0013] In combination with the first aspect, in some achievable ways, the field of view modulation element includes a negative lens, the lens assembly has a focal length f1, the lens module has a focal length f2, and f1<f2. This is beneficial to improving the imaging quality of the lens module and reducing the aperture value of the lens module. The deflection angle entering the lens assembly is made smaller, the aberration is smaller, and the imaging quality is improved.

[0014] In combination with the first aspect, in some achievable manners, the imaging aperture of the lens closest to the field modulation element among the plurality of lenses is SDP1, and SDP1>EPD. In this way, the amount of light entering through the aperture in the same unit time is less, which is beneficial to improving the imaging quality of the lens module.

[0015] In conjunction with the first aspect, in some achievable manners, the intersection of the surface of the field modulation element close to the object side and the optical axis is located on the image side, thereby facilitating the reduction of the deflection angle of light with a large deflection angle.

[0016] In combination with the first aspect, in some achievable manners, the imaging aperture of the lens with the smallest imaging aperture among the plurality of lenses is SDmin, SDmin<1.5*EPD. Thus, the field of view modulation element satisfying this relationship can block part of the light with a larger deflection angle, thereby increasing the imaging quality of the lens module.

[0017] In combination with the first aspect, in some achievable manners, the focal length of the lens closest to the field modulation element among the plurality of lenses is FS1, the aperture size of the lens module is F, and FS1 / SDP1<0.98*F. Thus, the aberration correction function of the aspheric surface can be fully utilized to reduce aberrations and improve imaging quality.

[0018] In combination with the first aspect, in some achievable ways, the field of view modulation element includes a shading element, the lens assembly has a focal length f1, the lens module has a focal length f2, and f1=f2. Thus, the field of view modulation element can block part of the light with a larger deflection angle, thereby improving the imaging quality. The assembly sensitivity of the lens module is reduced, and during the adjustment process, the adjustment accuracy of the entire lens module is reduced, thereby reducing the adjustment cost.

[0019] In combination with the first aspect, in some achievable manners, the minimum distance between the edge of the clear aperture of the lens closest to the field modulation element among the multiple lenses and the field modulation element along the optical axis is DB, and the sag height of the lens close to the field modulation element among the multiple lenses is SAP1, and DB>SAP1. In this way, light with a larger deflection angle can be blocked, thereby improving imaging quality.

[0020] In combination with the first aspect, in some achievable manners, 32.5°<HFOV<47.5°, the aperture F of the lens module is <2.4. Therefore, the aperture F of the lens module is smaller, and the amount of light entering through the aperture in the same unit time is more. The lens module has a larger field of view angle.

[0021] In a second aspect, an embodiment of the present application provides a camera, the camera comprising: a mounting seat and any one of the lens modules provided in the first aspect, the lens module being connected to the mounting seat. Since the lens module provided in the first aspect has the advantages of a large field of view and a large amount of light entering, it is obvious that the camera also has the advantages of a large field of view and a large amount of light entering.

[0022] In conjunction with the second aspect, in some achievable ways, the camera further comprises: a driver; the mounting seat comprises a first mounting platform and a second mounting platform, the first mounting platform is connected to the lens assembly, and the second mounting platform is connected to the field of view modulation element; the driver is used to drive the first mounting platform and the second mounting platform to move synchronously, or the driver is used to drive the first mounting platform and the second mounting platform to move relative to each other. Thus, only the lens assembly can be driven to achieve focus, or the entire lens module can be driven to achieve focus.

[0023] In a third aspect, an embodiment of the present application provides an electronic device, the electronic device comprising: a housing and any camera provided in the second aspect, the housing being connected to the camera. Obviously, the camera function of the electronic device has a large field of view and a large amount of light, which improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1a The figure is a schematic diagram of the structure of an electronic device.

[0025] Figure 1b A schematic diagram of the camera structure.

[0026] Figure 2 A schematic diagram of the exploded structure of a lens module provided in an embodiment of the present application.

[0027] Figure 3a A schematic diagram of the exploded structure of another lens module provided in an embodiment of the present application.

[0028] Figure 3b for Figure 3a Schematic diagram of the optical path structure of the lens module shown.

[0029] Figure 3c This is a characterization diagram of the optical performance of the lens module of Example 1.

[0030] Figure 3d This is a characterization diagram of the optical performance of the lens module of Example 2.

[0031] Figure 4a A schematic diagram of the structure of another lens module provided in an embodiment of the present application.

[0032] Figure 4b for Figure 4a Schematic diagram of the optical path structure of the lens module shown.

[0033] Figure 5a A schematic diagram of the exploded structure of the field of view modulation element and the first lens provided in an embodiment of the present application.

[0034] Figure 5b This is a characterization diagram of the optical performance of the lens module of Example 3.

[0035] Figure 6a A structural schematic diagram of another lens module provided in an embodiment of the present application.

[0036] Figure 6b for Figure 6a Schematic diagram of the optical path structure of the lens module shown.

[0037] Figure 6c This is a characterization diagram of the optical performance of the lens module of Example 4.

[0038] Figure 7a A schematic diagram of the exploded structure of another lens module provided in an embodiment of the present application.

[0039] Figure 7b for Figure 7a Schematic diagram of the optical path structure of the lens module shown.

[0040] Figure 7c This is a characterization diagram of the optical performance of the lens module of Example 5.

[0041] Figure 7d This is a characterization diagram of the optical performance of the lens module of Example 6.

[0042] In the figure: 01-electronic device; 11-cover plate; 12-display screen; 13-middle frame; 14-battery cover; 20-camera; 21-mounting seat; 211-first mounting platform; 212-second mounting platform; 22-driver; 100-lens module; 110-lens assembly; 111-first lens; 112-second lens; 113-third lens; 114-fourth lens; 115-fifth lens; 116-sixth lens; 117-aperture structure; 118-seventh lens; 119-eighth lens; 120-field modulation element; 130-filter; 002-imaging surface. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0044] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

[0046] The concepts involved in the following embodiments are briefly described below.

[0047] Aperture value (F-number, F): The ratio of the total focal length of the lens to the diameter of the entrance pupil. The smaller the aperture value, the more light enters through the aperture in the same unit time. The larger the aperture value, the less light enters through the aperture in the same unit time.

[0048] Curvature radius: Curvature is a value used to indicate the degree of curvature of a curve at a certain point. The greater the curvature, the greater the curvature of the curve. The reciprocal of the curvature is the curvature radius.

[0049] Stop: It includes aperture stop and field stop. Aperture stop can limit the width of imaging beam, determine the size of entrance pupil of optical system and the solid angle of beam, and affect the amount of light entering the optical system. Field stop limits the field of view of the object space that can be imaged by the optical system.

[0050] Effective focal length (EFL): The distance from the principal plane of an optical system to the corresponding focus.

[0051] Field of view (FOV): refers to the maximum angle that a lens can achieve.

[0052] Half field of view (HFOV): refers to half of the maximum angle that a lens can achieve.

[0053] Object side: The surface of the lens closest to the real object is the object side.

[0054] Image side: The surface of the lens closest to the imaging surface is the image side.

[0055] Positive lens: A lens or lens group has a positive focal length, which enables the lens or lens group to play the role of focusing light.

[0056] Negative lens: A lens or lens group has a negative focal length, which enables the lens or lens group to diverge the light.

[0057] Focal length: The distance from the principal plane of a lens to its corresponding focal point.

[0058] Half image height: the maximum radius of the imaging circle on the image plane, expressed as "IMH".

[0059] Abbe number: The Abbe number of a lens is the dispersion coefficient of the lens, which refers to the difference ratio of the refractive index of the lens at different wavelengths, and is used to characterize the degree of dispersion of the lens. Generally, the larger the refractive index of the medium, the more severe the dispersion and the smaller the Abbe number. Conversely, the smaller the refractive index of the medium, the milder the dispersion and the larger the Abbe number.

[0060] Aberration: refers to the inconsistency between the results obtained by non-paraxial ray tracing and the results obtained by paraxial ray tracing in the lens, and the deviation from the ideal state of Gaussian optics (first-order approximation theory or paraxial rays). Aberrations are divided into two categories: chromatic aberration and monochromatic aberration. Chromatic aberration is due to the refractive index of the lens material being a function of the wavelength. When light of different wavelengths passes through the lens, dispersion occurs due to the different refractive indices. The dispersion in which the refractive index of light decreases with the increase of wavelength can be called normal dispersion, while the dispersion in which the refractive index increases with the increase of wavelength can be called negative dispersion (or anomalous dispersion). Monochromatic aberration refers to aberration that occurs even in highly monochromatic light. According to the effect produced, monochromatic aberration is divided into two categories: "blurring the image" and "deforming the image". The former category includes spherical aberration, astigmatism, etc., and the latter category includes field curvature, distortion, etc. Chromatic aberration includes axial chromatic aberration and off-axis chromatic aberration. Axial chromatic aberration refers to the direction along the optical axis. Because the lens has different refractive indices for light of different wavelengths, the focus of light of different colors is different.

[0061] The embodiment of the present application provides an electronic device having a camera function, for example, the electronic device may be a mobile phone, a tablet computer (pad), a personal digital assistant (PDA), a television, a smart wearable product (for example, a smart watch, a smart bracelet), a virtual reality (VR) terminal device, etc. For the convenience of description, Figure 1a In the description, a mobile phone as an electronic device is taken as an example.

[0062] Figure 1a 01 is a schematic diagram of the structure of an electronic device. Figure 1a As shown, the electronic device 01 includes a cover plate 11, a display screen 12, a middle frame 13, and a battery cover 14. The battery cover 14 and the display screen 12 are respectively located on both sides of the middle frame 13, and the middle frame 13 and the display screen 12 are arranged in the battery cover 14, the cover plate 11 is arranged on the side of the display screen 12 away from the middle frame 13, and the display surface of the display screen 12 faces the cover plate 11. The display screen 12 has a display surface A1 for displaying images and a back surface A2 away from the display surface A1.

[0063] The present application embodiment does not limit the structures of the display screen 12, the cover plate 11 and the middle frame 13, and they can be configured according to the purpose of the electronic device 01. The electronic device 01 also has an image acquisition function, such as Figure 1a As shown, the electronic device 01 further includes a camera 20 . The camera 20 is connected to the battery cover 14 .

[0064] For example, in some embodiments of the present application, the camera 20 may be used as a rear camera. Figure 1a As shown, the camera 20 is located on the back surface A2 of the display screen 12 , and the light-receiving surface (the surface for receiving light) of the camera 20 can be away from the back surface A2 of the display screen 12 .

[0065] Alternatively, in some other embodiments of the present application, the camera 20 may be used as a front camera. Figure 1a As shown, the camera 20 may be located on the back surface A2 of the display screen 12. Furthermore, the light receiving surface of the camera 20 may face the back surface A2 of the display screen 12.

[0066] Figure 1b Schematic diagram of the structure of the camera 20. Figure 1b In the embodiment, the camera 20 includes a mounting seat 21 and a lens module 100, and the mounting seat 21 is connected to the lens module 100. The embodiment of the present application does not limit the connection method of the mounting seat 21 and the lens module 100. For example, the mounting seat 21 and the lens module 100 are bonded by an adhesive layer.

[0067] For example, in some embodiments, the camera 20 may further include a driver 22, and the driver 22 is connected to the mounting seat 21. The driver 22 is used to drive the mounting seat 21 to move, and the mounting seat 21 carries the lens module 100 to move, so as to achieve focusing. The embodiment of the present application does not limit the structure of the driver 22. For example, the driver 22 may be a voice coil motor (VCM).

[0068] Figure 1b In the embodiment, the lens module 100 includes a field modulation element 120 and a lens assembly 110. The mounting base 21 includes a first mounting platform 211 and a second mounting platform 212. The first mounting platform 211 is connected to the lens assembly 110. The second mounting platform 212 is connected to the field modulation element 120.

[0069] In some embodiments, the first mounting platform 211 and the second mounting platform 212 are both connected to the driver 22. The driver 22 can drive the first mounting platform 211 and the second mounting platform 212 to move synchronously, so that the field of view modulation element 120 and the lens assembly 110 move synchronously to achieve focusing. In other embodiments, the first mounting platform 211 is connected to the driver 22, and the first mounting platform 211 and the second mounting platform 212 are spaced apart. The driver 22 can drive the first mounting platform 211 to approach or move away from the second mounting platform 212, so that the lens assembly 110 approaches or moves away from the field of view modulation element 120, so as to achieve focusing.

[0070] Figure 2 A schematic diagram of the exploded structure of a lens module 100 provided in an embodiment of the present application. Figure 2 In the embodiment, the lens module 100 includes a field of view modulator 120 and a lens assembly 110. The field of view modulator 120 is located on the side of the lens assembly 110 close to the object to be photographed (i.e., the object side). The lens assembly 110 includes a plurality of lenses, and the optical axes of the plurality of lenses ( Figure 2 The middle dotted line OO) is coaxial.

[0071] like Figure 2 As shown, the imaging aperture of the field of view modulation element 120 is SD, and the half field of view angle of the lens module 100 is HFOV. The distance between the image side surface of the field of view modulation element 120 and the object side surface of the lens assembly 110 is CD. The entrance pupil diameter of the lens module 100 is EPD (entrance pupil diameter). Among them, the product of the tangent value of the half field of view angle of the lens module 100 (tan (HFOV)) and CD, the entrance pupil diameter and the imaging aperture SD of the field of view modulation element 120 satisfy the following relationship: SD < (EPD + CD * tan (HFOV)).

[0072] The field of view modulator 120 and the lens assembly 110 satisfy the above formula, and the field of view modulator 120 can block part of the light with a larger deflection angle. Alternatively, the field of view modulator 120 can reduce the deflection angle of the light with a larger deflection angle, so that the lens module 100 can reduce the aberration of the large field of view imaging light, thereby improving the imaging quality. The lens assembly 110 includes multiple lenses, and the multiple lenses solve the problems of chromatic aberration, astigmatism, field curvature, etc.

[0073] Figure 2 In the figure, n2 is the central field imaging beam, and n1 is the edge field imaging beam. The central field imaging beam n2 propagates to the center of the imaging surface 002 after passing through the lens module 100. The edge field imaging beam n1 propagates to the edge of the imaging surface 002 after passing through the lens module 100. The angle between the beam before entering the lens module 100 and the optical axis (dashed line OO) of the lens module 100 is the deflection angle. For example, Figure 2In the equation, α is the deflection angle of light ray n1.

[0074] Exemplarily, the half field of view HFOV of the lens module 100 is greater than 32.5° and less than 47.5°. For example, HFOV may be 33°, 34°, 35°, 36°, 37°, 40°, 42°, 42.5°, 43°, 44°, 45°, 46° or 47°, etc. The aperture F of the lens module 100 is less than 2.4. For example, the aperture F of the lens module 100 may be 1.8, 1.9, 2, 2.1, 2.2, 2.3, etc. The smaller the aperture F of the lens module 100, the more light enters through the aperture in the same unit time. The lens module 100 provided in the embodiment of the present application has a larger half field of view angle, and obviously, also has a larger field of view angle.

[0075] In some embodiments of the present application, the size of the lens assembly 110 along the optical axis is LP. The effective focal length of the lens assembly 110 is EFL. The product of the effective focal length EFL of the lens assembly 110 and the size LP of the lens assembly 110 along the optical axis (LP*EFL) and the distance CD between the image side surface of the field modulation element 120 and the object side surface of the lens assembly 110 satisfies: CD / (LP*EFL)<0.9. Exemplarily, CD / (LP*EFL) can be equal to 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or 0.85, etc. In this way, it is beneficial to the imaging quality of the lens assembly 110 and reduces chromatic aberration.

[0076] In some embodiments of the present application, the half image height (IMH) of the lens module 100 is greater than 3 mm (millimeter). In this way, the lens module 100 can have a larger imaging magnification and better imaging quality. Exemplarily, the half image height (IMH) of the lens module 100 can be 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 5 mm, 5.6 mm or 6 mm, etc.

[0077] As mentioned above, the lens assembly 110 includes a plurality of lenses, and the optical axes of the plurality of lenses are coaxial. The embodiment of the present application does not limit the number of lenses in the lens assembly 110. For example, the number may be five, six, seven, eight or more.

[0078] Figure 2 In the figure, the lens assembly 110 includes six lenses. For the convenience of description, the multiple lenses in the lens assembly 110 are named as the first lens 111, the second lens 112, the third lens 113, the fourth lens 114, the fifth lens 115 and the sixth lens 116 in sequence along the direction away from the field modulation element 120.

[0079] The distance CD between the image-side surface of the field modulation element 120 and the object-side surface of the lens assembly 110 is the distance between the image-side surface of the field modulation element 120 and the object-side surface of the first lens 111 .

[0080] Exemplarily, the first lens 111 which is the lens closest to the object side in the lens assembly 110 is a positive lens, and the sixth lens 116 which is the lens closest to the image side in the lens assembly 110 is a negative lens.

[0081] In some embodiments of the present application, the lens assembly 110 further includes an aperture structure 117, and the aperture structure 117 is located on a side of the first lens 111 close to the field modulation element 120. Alternatively, the aperture structure 117 may be located between the first lens 111 and the second lens 112.

[0082] After the external light enters the lens module 100, it passes through each lens in the lens module 100 and forms an image on the imaging surface 002. In some embodiments of the present application, in order to filter out the light that passes through the lens assembly 110 and is not conducive to imaging, such as infrared light, the lens module 100 further includes a filter 130.

[0083] In some embodiments of the present application, the minimum distance between the lens with the largest Abbe number and the lens with the smallest Abbe number among the plurality of lenses is CTN, and the ratio of CTN to the distance CD between the image side surface of the field modulation element 120 and the object side surface of the lens assembly 110 is less than 1. That is, CTN / CD<1. For example, CTN / CD may be equal to 0.98, 0.95, 0.92, 0.9, 0.88 or 0.85, etc.

[0084] Thus, CTN / CD<1, the field modulation element 120 can block light with a large deflection angle or block part of the light with a large deflection angle, thereby improving the imaging quality of the lens module 100. In addition, the lens assembly 110 has a small dispersion, thereby improving the imaging quality.

[0085] Figure 2 In the example, the lens with the largest Abbe number is the second lens 112, and the lens with the smallest Abbe number is the fourth lens 114. It can be understood that in other embodiments, the lens with the largest Abbe number can be any lens in the lens assembly 110, and the lens with the smallest Abbe number can be any lens in the lens assembly 110.

[0086] In some embodiments, at least two of the multiple lenses of the lens assembly 110 have an Abbe number less than 30. Exemplarily, the number of lenses with an Abbe number less than 30 in the lens assembly 110 may be two, three, four, or more. The Abbe number of at least two lenses is less than 30, which can better match the dispersion of the two lenses, thereby better calibrating aberrations and light chromatic aberrations, and further ensuring clear imaging.

[0087] In some embodiments, the lens farthest from the field modulating element 120 among the plurality of lenses ( Figure 2 The image side surface of the sixth lens 116 in the embodiment has at least one inflection point. For example, Figure 2 In the embodiment, the image side surface of the lens farthest from the field modulation element 120 has two inflection points (point E1 and point E2). The inflection points help to increase the image plane height and further correct the off-axis aberration of the lens module 100.

[0088] In some embodiments, the lens (first lens 111) closest to the field modulator 120 among the multiple lenses of the lens assembly 110 is a first positive lens, and the object side surface of the first positive lens is a convex surface. The first lens 111 has the function of converging light, so that the lens assembly 110 has a better light converging ability, and the total optical path length of the lens assembly 110 can be reduced. The object side surface of the first positive lens is convexly arranged toward the object, which is conducive to solving the problems of chromatic aberration, astigmatism or field curvature.

[0089] As mentioned above, the field of view modulation element 120 blocks part of the light with a larger deflection angle, which can reduce the aberration of the light of the large field of view imaging, thereby improving the imaging quality, so that the lens module 100 has a larger field of view angle and the amount of light entering. Alternatively, the field of view modulation element 120 reduces the deflection angle of the light with a larger deflection angle, which can also improve the imaging quality of the lens module 100. Alternatively, the field of view modulation element 120 blocks part of the light with a larger deflection angle, and also reduces the deflection angle of the light with a larger deflection angle, which can also improve the imaging quality of the lens module 100.

[0090] Exemplarily, the field of view modulator 120 has a negative focal length and can be a negative lens. Alternatively, the field of view modulator 120 has a positive focal length and can be a positive lens. Alternatively, the field of view modulator 120 can be a shading element. The following is an example of the structure of the field of view modulator 120 and the structure of the lens module 100 having the field of view modulator 120.

[0091] In some embodiments, view field modulating element 120 has a negative focal length.

[0092] Figure 3a This is a schematic diagram of the exploded structure of another lens module 100 provided in an embodiment of the present application. Figure 3a , the field modulation element 120 includes a negative lens. Figure 3a In the embodiment, the field modulation element 120 includes a lens, which is a negative lens. In other embodiments, the field modulation element 120 may be a lens group, which may include two, three or more lenses. The lens group has a negative focal length, and the lens group can play a role in diverging light.

[0093] Figure 3b for Figure 3a Schematic diagram of the optical path structure of the lens module 100 is shown. Figure 3b It can be seen that the deflection angle of the light with a larger deflection angle decreases after passing through the field modulation element 120, which is beneficial to improving the imaging quality of the lens module 100.

[0094] In the example where the field modulating element 120 has a negative focal length, the lens assembly 110 has a focal length f1, and the lens module 100 has a focal length f2, where f1<f2. This is beneficial for increasing the field of view of the lens module 100 and reducing the aperture value of the lens module 100. This makes the deflection angle entering the lens assembly 110 smaller, the aberration is smaller, and the imaging quality is improved.

[0095] exist Figure 3a In the example, the imaging aperture of the lens closest to the field modulator 120 among the multiple lenses of the lens assembly 110 is SDP1, and the imaging aperture SDP1 of the first lens 111 is greater than the entrance pupil diameter EPD of the lens module 100, SDP1>EPD. In this way, the amount of light entering through the aperture in the same unit time is less, which is conducive to improving the field of view of the lens module 100.

[0096] In some embodiments, the intersection point (point K) of the surface of the field modulation element 120 close to the object side and the optical axis (dashed line OO) is located on the image side. In other words, the field modulation element 120 is a negative lens, and the intersection point K of the surface of the negative lens close to the object side and the optical axis is located on the image side. This is beneficial to reduce the deflection angle of light with a large deflection angle. Usually, the lens closest to the image side in the lens assembly 110 is a negative lens. The intersection point K is located on the image side of the field modulation element 120, which is beneficial to the symmetry of the surface of the lens assembly 110 close to the image side and the surface of the field modulation element 120 close to the object side, which is beneficial to improve the imaging quality.

[0097] In some embodiments, the imaging aperture of the lens with the smallest imaging aperture among the multiple lenses of the lens assembly 110 is SDmin, and SDmin is less than 1.5 times the entrance pupil diameter of the lens module 100. That is, SDmin<1.5*EPD. In this way, the field modulation element 120 that satisfies this relationship can block part of the light with a larger deflection angle, thereby improving the imaging quality of the lens module 100.

[0098] Figure 3aIn the example, the lens with the smallest imaging aperture is the second lens 112. It can be understood that in other embodiments, the lens with the smallest imaging aperture may be the third lens 113 or the fourth lens 114, etc.

[0099] In some embodiments, the focal length of the lens closest to the field modulation element 120 among the multiple lenses of the lens assembly 110 is FS1, that is, the focal length of the first lens 111 is FS1. The aperture size of the lens module 100 is F. The ratio (FS1 / SDP1) of the focal length FS1 of the first lens 111 and the imaging aperture SDP1 is less than 0.98 times the aperture of the lens module 100. That is, FS1 / SDP1<0.98*F. In this way, the correction function of the aspheric surface on the aberration can be fully utilized. Reduce the aberration and improve the imaging quality.

[0100] The following examples 1 and 2 are Figure 3a The parameters of each lens in the lens module 100 shown in FIG. 1 are illustrated by way of example.

[0101] Example 1

[0102] Table 1 illustrates some parameters of the lens module 100 in Example 1.

[0103] Table 1

[0104] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 FLM -43 -57 172 17.3 SD (unit: mm) 9 9.5 7.3 6 8.66 3.6 SDP1(unit: mm) 7.8 9.32 7.6 5.96 8.4 3.2 EPD (unit: mm) 6.5 7.7 7.3 5.96 8.13 3.44 HFOV 42.7 42.7 38.6 39 42.7 42.4 CD (unit: mm) 2.8 3.79 0.76 0.21 2.73 1.39 EPD+CD*2*tan(FOV / 2) 11.67 14.69 8.51 6.30 13.17 5.98 EFL 6.7 6.7 7.65 6.2 11.38 6.7 CTN (unit: mm) 0.1 0.05 0.05 0.06 0.075 0.05 CTN / CD 0.04 0.01 0.07 0.29 0.03 0.04 LP (unit: mm) 8.7 9.4 9.9 8.5 12 6.2 CD / (LP*EFL) 0.048 0.060 0.010 0.004 0.020 0.033 IMH (unit: mm) 6.25 6.25 6.25 5.16 10.6 6.25 DB(unit: mm) 1.25 1.6 SAP1(unit: mm) 0.5 1.16 FS1(unit: mm) 5.62 5.39 FS1 / SDP1 0.720513 0.578326 SDmin (unit: mm) 6.06 5.8

[0105] In Table 1, FLM is the focal length of the field of view modulation element 120. SD is the imaging aperture of the field of view modulation element 120. SDP1 is the imaging aperture of the first lens 111. EPD is the entrance pupil diameter of the lens module 100. HFOV is the half field of view angle of the lens module 100. CD is the distance between the image side surface of the field of view modulation element 120 and the object side surface of the lens assembly 110. EFL is the effective focal length of the lens assembly 110. CTN is the minimum distance between the lens with the largest Abbe number and the lens with the smallest Abbe number among the multiple lenses of the lens assembly 110. LP is the size of the lens assembly 110 along the optical axis. IMH is the half image height of the lens module 100. DB is the minimum distance between the first lens 111 and the field of view modulation element 120 along the optical axis. SAP1 is the sagittal height of the first lens 111. FS1 is the focal length of the first lens 111. SDmin is the imaging aperture of the lens with the smallest imaging aperture among the multiple lenses of the lens assembly 110.

[0106] Table 1 illustrates some parameters of the lens module 100 of Example 1. Tables 2 and 3 illustrate detailed parameter settings of the lens module 100 of Example 1.

[0107] Table 2

[0108]

[0109]

[0110] The above Table 2 shows the structural data of each component when the focal length of the lens module 100 is 6.7 mm, the aperture value is 1.03, and the half field angle is 42.5°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 2 are as follows: Figure 3a As shown. Among them, Figure 3a The surface OBJ of the object is not marked. The thickness in Table 2 refers to the center thickness of the element in the optical axis direction and the next surface.

[0111] The surface expressions of each surface of the lens module 100 are as follows:

[0112]

[0113] Among them, z(x,y) is the optical surface sag; k is the cone coefficient; c is the radius of curvature; r is the radius height in the direction of the optical axis; r 2 =x 2 +y 2 ; A i are the polynomial coefficients; r i is the normalized radial coordinate.

[0114] Table 3

[0115] surface S1 S2 S3 S4 S5 S6 S7 k 0 0 0 0 0 0 0 A4 -0.0013774 -0.0014696 -0.0009971 -0.0017758 -0.0117327 -0.0114073 -4.805E-05 A6 0.00031597 0.00035126 -3.24E-06 0.00022048 0.00157868 0.00153866 0.00023681 A8 -1.788E-05 -1.879E-05 -3.752E-06 -1.756E-05 -0.0001256 -0.0001918 -6.315E-05 A10 6.0857E-07 6.618E-07 -8.318E-09 5.579E-07 7.2036E-06 1.7782E-05 7.3835E-06 A12 -1.203E-08 -1.086E-08 -1.404E-08 -4.04E-09 -2.931E-07 -7.065E-07 2.0995E-08 A14 1.0127E-10 4.4306E-11 2.2318E-10 -2.993E-10 5.945E-09 -9.948E-09 -1.548E-08 A16 surface S8 S9 S10 S11 S12 S13 S14 k 0 0 0 0 0 -1 0 A4 -0.0024365 -0.0145739 -0.0201842 -0.0065441 0.00959181 -0.0107218 -0.0126536 A6 0.00041095 0.0018437 0.00258566 -0.0018079 -0.0040985 -0.0005379 3.3893E-05 A8 -6.383E-05 -0.0002888 -0.0003271 2.5512E-06 0.00046085 0.00038097 9.827E-05 A10 7.1284E-06 -6.641E-06 4.519E-07 3.5978E-05 -1.996E-05 -4.165E-05 -9.58E-06 A12 -6.041E-07 4.8525E-06 4.8074E-06 -5.964E-06 2.1614E-08 2.0417E-06 4.0249E-07 A14 3.6429E-08 -4.814E-07 -5.8E-07 5.0026E-07 2.1267E-08 -4.818E-08 -7.805E-09 A16 6.361E-09 2.3335E-08 -1.782E-08 -4.297E-10 4.4566E-10 5.4553E-11

[0116] Among them, Table 3 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14 and A16 are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients respectively.

[0117] As can be seen from Table 3 above, the lens module 100 in Table 2 has a larger field angle and a larger amount of light entering, which is beneficial to improving the imaging quality of the lens module 100 and reducing the aperture value of the lens module 100. The deflection angle entering the lens assembly 110 is smaller, the aberration is smaller, and the imaging quality is improved.

[0118] Figure 3c This is a characterization diagram of the optical performance of the lens module 100 of Example 1. Figure 3c In the figure on the left, the axial chromatic aberration of light with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm after passing through the lens module 100 of Example 1 is shown. The ordinate represents the normalized pupil coordinate, and the abscissa represents the axial chromatic aberration, in millimeters. Figure 3cThe lines intersecting the horizontal coordinates in the middle left figure are the axial chromatic aberrations of 470nm, 510nm, 555nm, 610nm and 650nm from left to right. It can be seen that the axial chromatic aberration of the lens module 100 of Example 1 in each state is controlled within a very small range.

[0119] Figure 3c The middle figure is a schematic diagram of the field curvature of the lens module 100. The solid line in the middle figure is a schematic diagram of the field curvature in the meridian direction after the 650nm light passes through the lens module 100, and the dotted line is a schematic diagram of the field curvature in the sagittal direction after the 650nm light passes through the lens module 100. Figure 3c The ordinate of the middle figure is the object angle, and the abscissa represents the astigmatism value in the meridian direction (dashed line) and the sagittal direction (solid line), and the unit of the abscissa is millimeter. Figure 3c In the figure, the right figure is a schematic diagram of optical distortion of 650nm light after passing through the lens module 100 of Example 1. The right figure shows the optical distortion values ​​corresponding to different fields of view, the ordinate is the object angle, and the abscissa unit is percentage.

[0120] from Figure 3c It can be seen that the axial chromatic aberration of the lens module 100 of Example 1 in each state is controlled within a very small range, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0121] Example 2

[0122] Table 1 illustrates some parameters of the lens module 100 of Example 2. Tables 4 and 5 illustrate detailed parameter settings of the lens module 100 of Example 2.

[0123] Table 4

[0124]

[0125] The above Table 4 shows the structural data of each component when the focal length of the lens module 100 is 6.7 mm, the aperture value is 0.87, and the half field angle is 42.5°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 7 are as follows: Figure 3a As shown. Among them, Figure 3a The surface without the object is OBJ. The thickness in Table 4 refers to the center thickness of the element in the optical axis direction and the next surface.

[0126] The surface expressions of each surface of the lens module 100 in Example 2 can be found in Example 1, and will not be repeated here.

[0127] Table 5

[0128]

[0129]

[0130] Among them, Table 5 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14 and A16 are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients respectively.

[0131] It can be seen from the above Table 5 that the lens module 100 in Table 4 has a larger field of view angle and a larger amount of light entering.

[0132] Figure 3d This is a characterization diagram of the optical performance of the lens module 100 of Example 2. Figure 3d The meaning of each figure and Figure 3c Same, see Figure 3c Description of . Figure 3d The lines intersecting the horizontal coordinates in the middle left figure represent the axial chromatic aberration of wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm from left to right. Figure 3d It can be seen that the axial chromatic aberration of the lens module 100 of Example 2 in each state is controlled within a very small range, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0133] In some other embodiments of the present application, the viewing field modulation element 120 includes a light shielding element.

[0134] Figure 4a A schematic structural diagram of another lens module 100 provided in an embodiment of the present application. Figure 4a In the example, the field modulation element 120 includes a light shielding element.

[0135] The embodiments of the present application do not limit the structure of the shading element. In some embodiments, the shading element is an aperture structure. The aperture structure can block light with a large deflection angle. In other embodiments, the shading element can be a lens, and a black coating (such as a black glue layer) is provided on the edge of the lens, and the black coating can absorb light with a large deflection angle. Alternatively, in some other embodiments, the shading element can be a prism. Light with a large deflection angle will not be projected onto the lens assembly 110 after passing through the prism.

[0136] In the embodiment where the field of view modulator 120 includes a shading element, the lens assembly 110 has a focal length f1, and the lens module 100 has a focal length f2, where f1=f2. The field of view modulator 120 can block part of the light with a larger deflection angle, thereby increasing the field of view. The assembly sensitivity of the lens module 100 is reduced, and during the adjustment process, the adjustment accuracy of the entire lens module 100 is reduced, thereby reducing the adjustment cost.

[0137] It is understandable that the aforementioned f1=f2 may be within a certain error range, for example, f1-f2≤±0.3.

[0138] In the embodiment where the field modulation element 120 is an aperture structure, for example, Figure 4a In the embodiment, the field modulation element 120 and the aperture structure in the lens assembly 110 can be connected to form an integrally formed part.

[0139] Figure 4a In the example, the lens assembly 110 includes seven lenses, namely a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116 and a seventh lens 118.

[0140] Figure 4b for Figure 4a The optical path structure diagram of the lens module 100 is shown in FIG. Figure 4b In the embodiment, part of the light with a larger deflection angle is blocked by the field of view modulation element 120, thereby improving the imaging quality of the lens module 100.

[0141] Figure 4a In FIG. 1 , the sagittal height of the first lens 111 is SAP1, wherein the sagittal height is the height of the surface of the first lens 111 close to the field modulation element 120 along the optical axis (dashed line OO).

[0142] Figure 5a Schematic diagram of the exploded structure of the field modulation element 120 and the first lens 111 provided in an embodiment of the present application. Figure 5a In the embodiment, the minimum distance between the lens (first lens 111) closest to the field modulation element 120 and the field modulation element 120 along the optical axis (dashed line OO) is DB. DB>SAP1. In this way, light with a large deflection angle can be blocked to improve the imaging quality.

[0143] The following example shows three pairs Figure 4a The parameters of each lens in the lens module 100 shown in FIG. 1 are illustrated by way of example.

[0144] Example 3

[0145] Table 1 illustrates some parameters of the lens module 100 of Example 3. Tables 6 and 7 illustrate detailed parameter settings of the lens module 100 of Example 3.

[0146] Table 6

[0147]

[0148]

[0149] The above Table 6 shows the structural data of each component when the focal length of the lens module 100 is 7.65 mm, the aperture value is 1.03, and the half field angle is 39°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 6 are as follows: Figure 4a As shown. Among them, Figure 4a The surface OBJ of the object is not marked. The thickness in Table 6 refers to the center thickness of the element in the optical axis direction and the next surface.

[0150] The surface expressions of each surface of the lens module 100 in Example 3 can be found in Example 1, which will not be repeated here.

[0151] Table 7

[0152] surface S1 S2 S3 S4 S5 S6 S7 k 0 0 0 0 0 0 0 A4 -0.0010309 -0.002222 -0.0077742 -0.008887 -0.0009334 -0.0022945 -0.0033237 A6 -0.0001589 -0.0002068 0.00074569 0.00095394 7.4595E-05 -8.411E-05 0.0004889 A8 5.2204E-06 2.0875E-05 -8.52E-05 -0.0001275 6.745E-06 -3.09E-06 -0.0001712 A10 -2.005E-06 -1.002E-06 1.1296E-05 1.1685E-05 -3.714E-06 -1.524E-06 1.9867E-05 A12 1.4041E-07 8.4332E-09 -8.431E-07 -7.498E-07 5.5647E-07 3.3217E-07 -1.371E-06 A14 -3.2E-09 3.7679E-10 2.3686E-08 1.2932E-08 -3.024E-08 -1.879E-08 4.915E-08 A16 surface S8 S9 S10 S11 S12 S13 S14 k 0 0 0 0 0 -1 0 A4 -0.0143818 -0.008696 -0.0013211 -0.0057054 0.00029283 -0.0271779 -0.02141 A6 0.00137262 -0.0013138 -0.003164 -0.0015995 -0.0011051 0.00279666 0.00224494 A8 -0.0002656 -1.242E-05 0.00042941 0.00044631 8.6675E-05 -4.924E-05 -0.0001435 A10 3.1954E-05 5.4658E-06 -3.728E-05 -6.638E-05 3.3113E-06 -1.277E-05 5.6389E-06 A12 -2.075E-06 8.3E-07 1.9609E-06 5.0226E-06 -9.443E-07 1.3082E-06 -1.394E-07 A14 5.7E-08 -1.014E-07 -4.773E-08 -1.841E-07 5.2147E-08 -5.342E-08 2.0432E-09 A16 9.9125E-11 2.6556E-09 -8.975E-10 8.1915E-10 -1.442E-11

[0153] Among them, Table 11 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14 and A16 are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients respectively.

[0154] As can be seen from Table 7, the lens module 100 in Table 6 has a large aperture, and its aperture value and field angle are both large, which is beneficial to improving the imaging quality of the lens module 100 and reducing the aperture value of the lens module 100. This makes the deflection angle entering the lens assembly 110 smaller, the aberration is smaller, and the imaging quality is improved.

[0155] Figure 5b This is a characterization diagram of the optical performance of the lens module 100 of Example 3. Figure 5b The meaning of each figure and Figure 3c Same, see Figure 3c Description of . Figure 5b The lines intersecting the horizontal coordinates in the middle left figure represent the axial chromatic aberration of wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm from left to right. Figure 5b It can be seen that the axial chromatic aberration of the lens module 100 of Example 3 is controlled within a very small range in each state, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0156] In some other embodiments of the present application, the viewing field modulation element 120 includes a prism.

[0157] Figure 6a This is a structural diagram of another lens module 100 provided in an embodiment of the present application. Figure 6a The field modulation element 120 is a prism, which also has a light shielding effect. Figure 6aIn the example, the lens assembly 110 includes eight lenses, namely a first lens 111, a second lens 112, a third lens 113, a fourth lens 114, a fifth lens 115, a sixth lens 116, a seventh lens 118 and an eighth lens 119.

[0158] Figure 6b for Figure 6a Schematic diagram of the optical path structure of the lens module 100 is shown. Figure 6b In the embodiment where the field modulation element 120 is a prism, the deflection angle of the lens assembly 110 can also be reduced, the field angle of the lens module 100 can be increased, and the aperture value of the lens module 100 can be reduced. Figure 6a The parameters of each lens in the lens module 100 shown in FIG. 1 are illustrated by way of example.

[0159] Example 4

[0160] Table 1 illustrates some parameters of the lens module 100 of Example 4. Tables 8 and 9 illustrate detailed parameter settings of the lens module 100 of Example 4.

[0161] Table 8

[0162]

[0163] The above Table 8 shows the structural data of each component when the focal length of the lens module 100 is 7.65 mm, the aperture value is 1.03, and the half field angle is 39°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 8 are as follows: Figure 6a As shown. Among them, Figure 6a The surface OBJ of the object is not marked. The thickness in Table 8 refers to the center thickness of the element in the optical axis direction and the next surface.

[0164] The surface expressions of each surface of the lens module 100 in Example 4 can be found in Example 1, which will not be repeated here.

[0165] Table 9

[0166]

[0167]

[0168] Among them, Table 9 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14 and A16 are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients respectively.

[0169] As can be seen from Table 9 above, the lens module 100 in Table 1 has a large aperture, and its aperture value and field angle are both large, which is beneficial to improving the field angle of the lens module 100 and reducing the aperture value of the lens module 100. This makes the deflection angle entering the lens assembly 110 smaller, the aberration is smaller, and the imaging quality is improved.

[0170] Figure 6c This is a characterization diagram of the optical performance of the lens module 100 of Example 4. Figure 6c The meaning of each figure and Figure 3c Same, see Figure 3c Description of . Figure 6c The lines intersecting the horizontal coordinates in the middle left figure represent the axial chromatic aberration of wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm from left to right. Figure 6c It can be seen that the axial chromatic aberration of the lens module 100 of Example 4 is controlled within a very small range in each state, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0171] In some other embodiments of the present application, the field modulation element 120 has a positive focal length.

[0172] Figure 7a This is a schematic diagram of the exploded structure of another lens module 100 provided in an embodiment of the present application. Figure 7a , the field modulation element 120 includes a positive lens. Figure 7a In the embodiment, the field of view modulation element 120 includes a lens, which is a positive lens. In other embodiments, the field of view modulation element 120 may be a lens group, which may include two, three or more lenses. The lens group has a positive focal length, and the lens group can play a role in converging light. Figure 7b for Figure 7a A schematic diagram of the optical path of the lens module 100 is shown. Figure 7b It can be seen from the figure that the field modulation element 120 reduces the deflection angle of light with a larger deflection angle.

[0173] In an example where the field modulating element 120 has a positive focal length, the lens assembly 110 has a focal length f1, and the lens module 100 has a focal length f2, where f1>f2. This helps to reduce the height of the lens module 100 and the space occupied by the lens module 100.

[0174] The following examples 5 and 6 are Figure 7a The parameters of each lens in the lens module 100 shown in FIG. 1 are illustrated by way of example.

[0175] Example 5

[0176] Table 1 illustrates some parameters of the lens module 100 of Example 5. Tables 10 and 11 illustrate detailed parameter settings of the lens module 100 of Example 5.

[0177] Table 10

[0178]

[0179]

[0180] The above Table 10 shows the structural data of each component when the focal length of the lens module 100 is 11.4 mm, the aperture value is 1.4, and the half field angle is 42.5°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 10 are as follows: Figure 7a As shown. Among them, Figure 7a The surface OBJ of the object is not marked. The thickness in Table 10 refers to the center thickness of the element in the optical axis direction and the next surface.

[0181] The surface expressions of each surface of the lens module 100 in Example 5 can be found in Example 1, which will not be repeated here.

[0182] Table 11

[0183] surface S1 S2 S3 S4 S5 S6 S7 k 0 0 0 0 0 0 0 A4 -0.001366796 -0.001289671 0.000147336 -0.000269105 -0.00522 -0.0053 0.000204 A6 -2.61741E-05 -2.16031E-05 -1.5789E-05 -6.09547E-05 0.000468 0.000588 -0.00038 A8 3.71656E-06 5.39807E-06 1.47584E-06 5.81074E-06 -3.8E-05 -5E-05 5.82E-05 A10 -9.11108E-08 -2.13727E-07 -1.29932E-07 -2.12159E-07 2.5E-06 3.1E-06 -6.2E-06 A12 2.00818E-09 6.95297E-09 4.81237E-09 4.11386E-09 -9.5E-08 -1.1E-07 3.41E-07 A14 -3.98566E-11 -1.11984E-10 -4.15137E-11 -3.59278E-11 1.35E-09 1.54E-09 -5.9E-09 A16 surface S8 S9 S10 S11 S12 S13 S14 k 0 0 0 0 0 0 0 A4 -0.000410854 -0.00412 -0.00698 -0.004011735 0.000699 -0.00168 -0.00236 A6 8.61594E-05 0.000772 0.00067 -0.000209468 -0.00039 0.000162 0.000115 A8 -5.74157E-05 -0.00013 -5.8E-05 2.12289E-05 3.26E-05 -7.2E-06 -4.3E-06 A10 6.97539E-06 1.15E-05 2.92E-06 -8.23111E-07 -1.2E-06 1.95E-07 1.01E-07 A12 -3.68334E-07 -5.6E-07 -8.8E-08 -9.63923E-09 2.28E-08 -3E-09 -1.5E-09 A14 8.70385E-09 1.34E-08 1.51E-09 1.92225E-09 -2E-10 2.33E-11 1.23E-11 A16 -1.2E-10 -1.7E-11 -4.90154E-11 5.64E-13 -7.5E-14 -4.1E-14

[0184] Among them, Table 11 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14 and A16 are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients respectively.

[0185] As can be seen from the above, the aperture value of the lens module 100 in Table 1 is relatively small, with an aperture value of 1.4, and a relatively large field of view angle of 85°. This is beneficial to improving the field of view angle of the lens module 100 and reducing the aperture value of the lens module 100. This makes the deflection angle entering the lens assembly 110 smaller, the aberration smaller, and improves the imaging quality.

[0186] Figure 7c This is a characterization diagram of the optical performance of the lens module 100 of Example 5. Figure 7c The meaning of each figure and Figure 3c Same as Figure 7c The lines intersecting the horizontal coordinates in the middle left figure represent the axial chromatic aberration of wavelengths of 510nm, 470nm, 555nm, 610nm and 650nm from left to right. Figure 7c It can be seen that the axial chromatic aberration of the lens module 100 of Example 5 is controlled within a very small range in each state, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0187] Example 6

[0188] Table 1 illustrates some parameters of the lens module 100 of Example 6. Tables 12 and 13 illustrate detailed parameter settings of the lens module 100 of Example 6.

[0189] Table 12

[0190]

[0191]

[0192] The above Table 12 shows the structural data of each component when the focal length of the lens module 100 is 6.7 mm, the aperture value is 1.95, and the half field angle is 42.5°. The units of the radius of curvature, thickness, and focal length are millimeters (mm). The surface codes of each component in Table 12 are as follows: Figure 7a As shown. Among them, Figure 7a The surface OBJ of the object is not marked. The thickness in Table 12 refers to the center thickness of the element in the optical axis direction and the next surface.

[0193] The surface expressions of each surface of the lens module 100 can be found in Example 1, which will not be repeated here.

[0194] Table 13

[0195] surface S1 S2 S3 S4 S5 S6 S7 k 0 0 0 0 0 0 0 A4 -0.00518127 -0.004104015 -0.00158 -0.00693 -0.01867 -0.017 -0.00029 A6 -0.001529145 -0.001586008 -0.00107 -0.00528 0.000468 0.005951 -0.00432 A8 -6.58174E-06 7.44677E-05 -0.00048 0.000947 -0.00143 -0.00232 0.002181 A10 -9.81403E-05 -5.6362E-05 0.000265 0.000716 0.001746 0.000806 -0.00056 A12 2.71046E-05 2.74042E-05 -6.7E-05 -0.00032 -0.00053 -0.00017 1.42E-05 A14 1.68E-05 4.73E-05 4.77E-05 9.86E-06 2.85E-06 A16 A18 A20 surface S8 S9 S10 S11 S12 S13 S14 k 0 0 0 0 0 -1 0 A4 0.010085 -0.00251 -0.00999 -0.02956 -0.02981 -0.00922 -0.01587 A6 -0.00732 -0.0012 0.001153 -0.00349 -0.00113 0.003855 0.008768 A8 0.003286 0.000517 0.000364 0.00388 0.000131 -0.00162 -0.00204 A10 -0.00052 0.000413 -0.00026 -0.00248 0.00021 0.000392 0.000263 A12 -2.8E-05 -0.00024 8.01E-05 0.000997 -6.1E-05 -5E-05 -2.1E-05 A14 9.56E-06 4.81E-05 -1.6E-05 -0.00025 7.42E-06 3.68E-06 1.05E-06 A16 -3.4E-06 1.35E-06 3.31E-05 -4.2E-07 -1.6E-07 -3.2E-08 A18 -1.9E-06 8.93E-09 3.55E-09 5.68E-10 A20 -3.4E-11 -4.3E-12

[0196] Among them, Table 13 is the data of each surface in the lens module 100, where k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18 and A20 are the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th and 20th order aspheric coefficients respectively.

[0197] From the above, it can be seen that the aperture value of the lens module 100 in Table 12 is smaller and the field of view angle is larger.

[0198] Figure 7d This is a characterization diagram of the optical performance of the lens module 100 of Example 6. Figure 7d The meaning of each figure and Figure 3c Same, see Figure 3c Description of . Figure 7d The lines intersecting the horizontal axes in the middle left figure represent the axial chromatic aberration of wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm from left to right.

[0199] from Figure 7dIt can be seen that the axial chromatic aberration of the lens module 100 of Example 6 in each state is controlled within a very small range, which controls the distortion of the optical system within a range that is not obviously discernible to the naked eye.

[0200] Examples 5 and 6 are only some examples of the field modulation element 120 having a positive focal length. It can be understood that in other embodiments, the lens module 100 can have other parameters.

[0201] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A lens module, characterized in that: The lens module comprises: A lens assembly, the lens assembly is used for imaging, the lens assembly comprises a plurality of lenses with coaxial optical axes; and A field of view modulation element, the field of view modulation element being located on the object side of the lens assembly; Among them, the imaging aperture of the field of view modulation element is SD; the distance between the image side surface of the field of view modulation element and the object side surface of the lens assembly is CD, the half field of view angle of the lens module is HFOV; the entrance pupil diameter of the lens module is EPD; SD<(EPD+CD*tan(HFOV)).

2. The lens module according to claim 1, characterized in that: The size of the lens assembly along the optical axis direction is LP, the effective focal length of the lens assembly is EFL, and CD / (LP*EFL)<0.

9.

3. The lens module according to claim 1 or 2, characterized in that: The shortest distance between the lens with the largest Abbe number and the lens with the smallest Abbe number among the plurality of lenses is CTN, and the ratio of CTN to CD is less than 1.

4. The lens module according to any one of claims 1 to 3, characterized in that: The half image height of the lens module is greater than 3 mm.

5. The lens module according to any one of claims 1 to 4, characterized in that: At least two of the plurality of lenses have an Abbe number less than 30.

6. The lens module according to any one of claims 1 to 5, characterized in that: The image-side surface of the lens farthest from the field modulation element among the plurality of lenses has at least one inflection point.

7. The lens module according to any one of claims 5 to 7, characterized in that: The lens closest to the field modulation element among the plurality of lenses is a first positive lens, and the object side surface of the first positive lens is a convex surface.

8. The lens module according to any one of claims 1 to 7, characterized in that: The field of view modulation element includes a second positive lens, the lens assembly has a focal length f1, and the lens module has a focal length f2, f1>f2.

9. The lens module according to any one of claims 1 to 7, characterized in that: The field of view modulation element includes a negative lens, the lens assembly has a focal length f1, and the lens module has a focal length f2, f1<f2.

10. The lens module according to claim 9, characterized in that: The imaging aperture of the lens closest to the field modulation element among the plurality of lenses is SDP1, and SDP1>EPD.

11. The lens module according to claim 9 or 10, characterized in that: The intersection of the surface of the field modulation element close to the object side and the optical axis is located on the image side.

12. The lens module according to any one of claims 9 to 11, characterized in that: The imaging aperture of the lens with the smallest imaging aperture among the plurality of lenses is SDmin, and SDmin<1.5*EPD.

13. The lens module according to any one of claims 10 to 11, characterized in that: The focal length of the lens closest to the field modulation element among the multiple lenses is FS1, the aperture size of the lens module is F, and FS1 / SDP1<0.98*F.

14. The lens module according to any one of claims 1 to 7, characterized in that: The field of view modulation element includes a shading element, the lens assembly has a focal length f1, and the lens module has a focal length f2, where f1=f2.

15. The lens module according to claim 14, characterized in that: The minimum distance between the edge of the light-clearance of the lens closest to the field modulation element among the multiple lenses and the field modulation element along the optical axis direction is DB, and the vector height of the lens close to the field modulation element among the multiple lenses is SAP1, DB>SAP1.

16. The lens module according to any one of claims 1 to 15, characterized in that: 32.5°<HFOV<47.5°, and the aperture F of the lens module is <2.

4.

17. A camera, characterized in that: The camera comprises: A mounting seat and a lens module as described in any one of claims 1-16, wherein the lens module is connected to the mounting seat.

18. The camera according to claim 17, characterized in that: The camera also includes: a driver; the mounting base includes a first mounting platform and a second mounting platform, the first mounting platform is connected to the lens assembly, and the second mounting platform is connected to the field of view modulation element; the driver is used to drive the first mounting platform and the second mounting platform to move synchronously, or the driver is used to drive the first mounting platform and the second mounting platform to move relative to each other.

19. An electronic device, characterized in that: The electronic device comprises: a housing and the camera according to claim 17 or 18, wherein the housing is connected to the camera.

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