Imaging lens and electronic device

Abstract

An imaging lens includes a light shield. The light shield includes an object side surface, an image side surface, an inner annular surface, a plurality of tapered light shield structures, and a nanostructure layer. The object side surface is perpendicular to and surrounds an optical axis. The image side surface is disposed opposite the object side surface and is closer to an image side than the object side surface. The inner annular surface connects the object side surface and the image side surface and surrounds the optical axis and defines a clear aperture. The tapered light shield structures are disposed on the inner annular surface and taper toward the optical axis and are periodically disposed around the optical axis. Each of the tapered light shield structures has a profile with a curved segment when viewed in a direction of the optical axis. The curved segment forms a curved surface on the inner annular surface. The nanostructure layer is disposed on the curved surface and has a plurality of ridge-like protrusions that extend in a non-directional manner. The nanostructure layer has an average height of greater than or equal to 98 nm and less than or equal to 350 nm. An electronic device having the imaging lens is also disclosed.

Description

Technical Field

[0001] This invention relates to an imaging lens and an electronic device, and more particularly to an imaging lens suitable for an electronic device. Background Technology

[0002] With the rapid advancement of technology, high-quality optical lenses have become an indispensable component. Furthermore, the applications of electronic devices equipped with optical lenses are expanding, leading to more diverse requirements for these lenses.

[0003] However, in recent years, traditional optical lenses have struggled to meet the high optical quality demands of diversified electronic products, especially since non-imaging light rays are easily reflected within the imaging lens, affecting image quality. Therefore, improving the structure of internal components of the imaging lens to reduce the intensity of non-imaging light reflections, in order to meet the high specifications required by today's electronic devices, has become an important issue in related fields. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention discloses an imaging lens and electronic device that helps to reduce the reflection of stray light (non-imaging light), thereby reducing the influence of stray light and improving the overall optical quality.

[0005] An embodiment of the present invention discloses an imaging lens through which an optical axis passes. The imaging lens includes a light-blocking plate. The light-blocking plate includes an object-side side, an image-side side, an inner annular surface, a plurality of tapered light-blocking structures, and a nanostructure layer. The object-side side is vertically disposed and surrounds the optical axis. The image-side side is disposed opposite to the object-side side, and the image-side side is closer to the image side of the imaging lens than the object-side side. The inner annular surface connects the object-side side and the image-side side, and surrounds the optical axis and defines a light-passing aperture. The tapered light-blocking structures are disposed on the inner annular surface, protruding from the inner annular surface and tapering towards the optical axis, and the tapered light-blocking structures are periodically disposed around the optical axis. When viewed along the optical axis, the contour of each tapered light-blocking structure has a first curved segment and a second curved segment. The first curved segment is closer to the optical axis than the second curved segment, and the first curved segment and the second curved segment each form a curved surface on the inner annular surface. The nanostructure layer is at least disposed on the surface formed by the first curve segment and the second curve segment. The nanostructure layer has multiple ridge-like protrusions extending non-directionally from the surface, and the average structural height of the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers.

[0006] Another embodiment of the present invention discloses an imaging lens through which an optical axis passes. The imaging lens includes a light-blocking plate. The light-blocking plate includes an object-side surface, an image-side surface, an inner annular surface, a plurality of tapered light-blocking structures, and a nanostructure layer. The object-side surface is perpendicular to and surrounds the optical axis. The image-side surface is disposed opposite to the object-side surface, and the image-side surface is closer to the image side of the imaging lens than the object-side surface. The inner annular surface connects the object-side surface and the image-side surface, and surrounds the optical axis and defines a light-passing aperture. The tapered light-blocking structures are disposed on the inner annular surface, protruding from the inner annular surface and tapering towards the optical axis, and the tapered light-blocking structures are periodically arranged around the optical axis. When viewed along the optical axis, the contour of each tapered light-blocking structure has at least one curved segment. The at least one curved segment forms a curved surface on the inner annular surface. A nanostructure layer is disposed on the curved surface formed by the at least one curved segment. The nanostructure layer has multiple ridge-like protrusions extending non-directionally from the curved surface, and the average height of the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers. When the center of the radius of curvature of the at least one curved segment is farther away from the optical axis than the at least one curved segment, the radius of curvature of the at least one curved segment is R. VC The radius of the light-transmitting aperture is R. L It satisfies the following condition: 0.05 ≤ (R VC / R L )×1.02π 4 ≤34. When the center of the radius of curvature of the at least one curve segment is closer to the optical axis than the at least one curve segment, the radius of curvature of the at least one curve segment is R. C The radius of the light-transmitting aperture is R. L It satisfies the following condition: 0.11 ≤ (R C / R L )×1.02π 4 ≤49.

[0007] Another embodiment of the present invention discloses an imaging lens through which an optical axis passes. The imaging lens includes a light-shielding element. The light-shielding element includes an object-side surface, an image-side surface, an inner annular surface, and a nanostructure layer. The object-side surface is disposed perpendicular to and surrounds the optical axis. The image-side surface is disposed opposite to the object-side surface, and the image-side surface is closer to the image side of the imaging lens than the object-side surface. The inner annular surface connects the object-side surface and the image-side surface, and surrounds the optical axis and defines a light-passing aperture. The nanostructure layer is disposed at least on the inner annular surface, and the nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the inner annular surface.

[0008] Another embodiment of the present invention discloses an electronic device comprising the above-described imaging lens.

[0009] According to the imaging lens and electronic device disclosed in the above embodiments, a nanostructure layer is provided on the inner ring surface of the light shield or light shielding element to reduce the surface reflectivity, so that the light shield or light shielding element is less likely to generate stray light that affects the imaging quality.

[0010] Furthermore, by setting ridge-like protrusions, the equivalent refractive index of the nanostructure layer can be gradually reduced from bottom to top, and a rough surface can be formed to reduce the reflection of stray light.

[0011] Furthermore, this invention discloses a tapered light-shielding structure with a curved surface to alter or disrupt the smooth inner ring surface of the light-shielding element. A nanostructure layer can also be further formed on the curved surface of the tapered light-shielding structure to reduce surface reflectivity, making the light-shielding element less prone to stray light affecting image quality. For example, this invention discloses a lens internal design that adds a subwavelength structure (including but not limited to an alumina (Al2O3) nanostructure layer deposited on the surface using atomic layer deposition) to the surface of the light-shielding element and uses it as the light-shielding mechanism. The light-shielding element can be a light-shielding plate, spacer, retainer, or barrel, or even a barrel integrated with a voice coil motor (VCM), which can be combined or used as unit components to form a light-shielding measure at a specific optical path position, allowing for more efficient control of non-imaging light inside the lens. This invention is applicable to, but not limited to, electronic devices such as mobile phones (dual-lens or multi-lens), tablet computers, personal video recorders, and wearable devices.

[0012] When (R) VC / R L )×1.02π 4 or (R) C / R L )×1.02π 4 When the above conditions are met, the inner ring surface can be appropriately passivated to make stray light even less likely to be reflected by the inner ring surface.

[0013] The above description of the content of this invention and the following description of the embodiments are used to demonstrate and explain the principles of this invention, and to provide a further explanation of the scope of protection of the claims of this invention. Attached Figure Description

[0014] Figure 1 This is a side cross-sectional view of the imaging lens according to the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 A top-view schematic diagram of the light-blocking plate of the imaging lens.

[0016] Figure 3 yes Figure 2 A schematic diagram of the AA area of ​​the light-blocking sheet magnified 3000 times according to the actual scale.

[0017] Figure 4 yes Figure 3 A schematic diagram of the AA region and the BB region magnified 30,000 times according to the actual scale.

[0018] Figure 5 yes Figure 2 A side view sectional view of the light-blocking sheet cut along line segment 5-5.

[0019] Figure 6 yes Figure 1 A three-dimensional schematic diagram of the light-blocking plate of the imaging lens.

[0020] Figure 7 yes Figure 6 A schematic diagram of the CC region of the light-blocking sheet magnified 3000 times according to the actual scale.

[0021] Figure 8 yes Figure 7 A schematic diagram of the CC region and the DD region magnified 5000 times according to the actual scale.

[0022] Figure 9 yes Figure 8 A schematic diagram of the EE region of the DD region, magnified 30,000 times according to the actual scale.

[0023] Figure 10 yes Figure 8 A schematic diagram of the DD region and the FF region magnified 30,000 times according to the actual scale.

[0024] Figure 11 yes Figure 8 A schematic diagram of the DD region and the GG region magnified 30,000 times according to the actual scale.

[0025] Figure 12 yes Figure 11 A schematic diagram of the GG region and HH region magnified 100,000 times according to the actual scale.

[0026] Figure 13 This is a side cross-sectional view of an imaging lens according to a second embodiment of the present invention.

[0027] Figure 14 yes Figure 13 A top-view schematic diagram of the light-blocking plate of the imaging lens.

[0028] Figure 15 yes Figure 14 A side view sectional view of the light-blocking sheet cut along line segment 15-15.

[0029] Figure 16 This is a side cross-sectional view of an imaging lens according to a third embodiment of the present invention.

[0030] Figure 17 yes Figure 16A top-view schematic diagram of the light-blocking plate of the imaging lens.

[0031] Figure 18 yes Figure 17 A side view sectional view of the light-blocking sheet cut along line segment 18-18.

[0032] Figure 19 yes Figure 16 A downward-view schematic diagram of the spacing element of the imaging lens.

[0033] Figure 20 yes Figure 19 A side view sectional view of the spacer element cut along line segment 20-20.

[0034] Figure 21 yes Figure 16 A three-dimensional schematic diagram of the spacer element of the imaging lens.

[0035] Figure 22 This is a side cross-sectional view of an imaging lens according to a fourth embodiment of the present invention.

[0036] Figure 23 yes Figure 22 A top-view schematic diagram of the light-blocking plate of the imaging lens.

[0037] Figure 24 yes Figure 23 A side view sectional view of the light-blocking sheet cut along line segment 24-24.

[0038] Figure 25 yes Figure 22 A top-view diagram of the lens barrel of the imaging lens.

[0039] Figure 26 yes Figure 25 A side view sectional view of the microscope tube cut along line segment 26-26.

[0040] Figure 27 yes Figure 22 A three-dimensional schematic diagram of the lens barrel of the imaging lens after being cut open.

[0041] Figure 28 yes Figure 27 A schematic diagram of region II of the sectionalized microscope tube magnified 3000 times to the actual scale.

[0042] Figure 29 yes Figure 28 A schematic diagram of the JJ region of region II, magnified 10,000 times according to the actual scale.

[0043] Figure 30 yes Figure 29 A schematic diagram of the JJ and KK regions magnified 30,000 times according to the actual scale.

[0044] Figure 31 This is a side cross-sectional view of an imaging lens according to the fifth embodiment of the present invention.

[0045] Figure 32 yes Figure 31 An exploded view of the imaging lens.

[0046] Figure 33 yes Figure 31 Another exploded diagram of some components of the imaging lens.

[0047] Figure 34 This is a side cross-sectional view of an imaging lens according to the sixth embodiment of the present invention.

[0048] Figure 35 yes Figure 34 An exploded view of the imaging lens.

[0049] Figure 36 yes Figure 34 Another exploded diagram of some components of the imaging lens.

[0050] Figure 37 This is an exploded schematic diagram of an electronic device according to a seventh embodiment of the present invention.

[0051] Figure 38 The present invention illustrates experimental data on the reflectance of surfaces with nanostructured layers in two reference films for various wavelengths of light.

[0052] [Symbol Explanation]

[0053] 1, 2, 3, 4, 5, 6, 70a, 70b, 70c, 70d: Imaging lenses

[0054] 11, 21, 31, 41, 51, 61: Light-blocking sheets

[0055] 111, 211, 311, 411, 511, 611, SP_1: Side view of the object

[0056] 112, 212, 312, 412, 512, 612, SP_2: Image from the side

[0057] 113, 213, 313, 413, 513, 5621, 613, 6721, SP_3: Inner torus

[0058] 114, 214, 314, 414: Gradual shading structure

[0059] 115, 215, 415, 435, SP_5: Micrometer structure

[0060] 116, 216, 316, 416, 436, 516, 566, 616, 6722, SP_6: Nanostructured layers

[0061] 12, 22, 32, 42, 52, 62: Lens groups

[0062] 321: First Lens

[0063] 322: Second lens

[0064] 13, 23, 33, 43, 53, 63: Lens tube

[0065] 331, 431: cylindrical part

[0066] 332, 432: plate-shaped part

[0067] 4320: Exposed surface

[0068] 3321, 4321: Support surface

[0069] 3322, 4322: Inner wall surface

[0070] 14, 24, 34, 44, 54, 64: Imaging planes

[0071] 55: Reflective element

[0072] 551: Reflective surface

[0073] 56: Retaining component

[0074] 561: Lens holding section

[0075] 562: Base section

[0076] 67: Fixing part

[0077] 671: Shell

[0078] 672: Drive holding component

[0079] 68: Elastic element group

[0080] 681: Upper elastic element

[0081] 682: Lower elastic element

[0082] 69: Drive Unit

[0083] 691: Magnetic components

[0084] 692: Coil

[0085] 7: Electronic devices

[0086] AA, BB, CC, DD, EE, FF, GG, HH, II, JJ, KK: Area

[0087] AS: Aperture

[0088] CP1: First curve segment

[0089] CP2: Second curve segment

[0090] CS: Surface

[0091] D: Spacing distance

[0092] H1, H2, H3: Height

[0093] L1: Basal layer

[0094] L2: Covering layer

[0095] LPO: Light-transmitting aperture

[0096] OA: Optical Axis

[0097] PR: Protrusion

[0098] RLP: Ridge

[0099] RT: Fixed element

[0100] SP: Spacer element

[0101] CT2: Thickness of the second lens along the optical axis

[0102] R C The radius of curvature of the second curve segment

[0103] R L Radius of the light aperture

[0104] R VC The radius of curvature of the first curve segment

[0105] T, T': Thickness of the light-shielding sheet (light-shielding element) Detailed Implementation

[0106] The following detailed description of the features and advantages of the present invention in the embodiments is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. Based on the disclosure of this specification, the scope of the claims, and the accompanying drawings, any person skilled in the art can easily understand the related objectives and advantages of the present invention. The following embodiments further illustrate the viewpoints of the present invention in detail, but are not intended to limit the scope of the present invention in any way.

[0107] This invention provides an imaging lens with an optical axis passing through it, and the imaging lens may include a light-shielding element and a lens group. The light-shielding element may be a light-shielding plate, a spacer element, a fixing element, or a lens barrel, or even a lens barrel integrated with a voice coil motor. When the light-shielding element is a light-shielding plate, a spacer element, or a fixing element, the imaging lens may further include a lens barrel, and the light-shielding element and the lens group may be housed within the lens barrel. When the light-shielding element is a lens barrel, the lens group may be housed within the light-shielding element (lens barrel).

[0108] When the light-shielding element is a light-shielding sheet, the light-shielding sheet can be made of composite material or metal. For example, the light-shielding sheet can be a plastic base layer covered by two coating layers, wherein the plastic material can be polyimide (PI) or polyethylene terephthalate (PET). Please refer to [reference needed]. Figure 5 The illustration shows a light-shielding sheet 11 with a multilayer structure comprising a base layer L1 covered by two covering layers L2, according to a first embodiment of the present invention. Alternatively, the light-shielding sheet may also be a base layer made of metal with a black pigment on its surface, wherein the metal material may be free-machining brass or a copper alloy. Please refer to... Figure 18 The illustration shows a light-shielding sheet 31 with a single-layer structure in accordance with a third embodiment of the present invention, consisting of a base layer L1 coated with black pigment on its surface. However, the light-shielding sheet of the present invention is not limited to the structure described above.

[0109] When the light-blocking element is a light-blocking plate, spacer element, fixing element, or lens barrel, the light-blocking element may include an object-side surface, an image-side surface, an inner ring surface, multiple tapered light-blocking structures, a micrometer structure, and a nanometer structure layer. The object-side surface is perpendicular to and surrounds the optical axis. The image-side surface is opposite to the object-side surface, and the image-side surface is closer to the image side of the imaging lens than the object-side surface. The inner ring surface connects the object-side surface and the image-side surface, and surrounds the optical axis and defines a light-passing aperture. Specifically, the light-passing aperture can be a through-hole formed by the smallest aperture of the light-blocking element. Furthermore, when the inner ring surface is not parallel to the optical axis and is formed as a conical surface, the light-passing aperture can be defined by the tip formed by the inner ring surface. When the light-blocking element is a light-blocking plate, please refer to... Figure 5 The diagram illustrates an inner annular surface 113 formed as a cylindrical surface parallel to the optical axis according to the first embodiment of the present invention. When the light-shielding element is a light-shielding sheet, please refer to... Figure 15 The diagram illustrates an inner annular surface 213 formed as an oblique conical surface non-parallel to the optical axis according to a second embodiment of the present invention. When the light-shielding element is a light-shielding sheet, please refer to... Figure 18 The diagram illustrates an inner annular surface 313 formed as a double-conical surface that is not parallel to the optical axis, according to a third embodiment of the present invention. It is worth noting that the inner annular surface can also be any combination of shapes, and the inner annular surface of the present invention is not limited to the structure described above.

[0110] A tapered light-blocking structure is disposed on the inner annular surface. This structure protrudes from the inner annular surface and gradually tapers towards the optical axis, and is periodically arranged around the optical axis. By configuring the tapered light-blocking structure, the smooth inner annular surface can be altered or disrupted to reduce the intensity of stray light reflection. The tapered light-blocking structure can be integrally molded with the rest of the light-blocking element. This helps to shorten production time. Please refer to [reference needed]. Figure 2 The illustration shows a tapered light-shielding structure 114 arranged periodically around the optical axis OA, which tapers from the inner annular surface 113 toward the optical axis OA according to the first embodiment of the present invention.

[0111] When viewed along the optical axis, the outline of each tapered light-blocking structure has at least one curved segment. Specifically, when viewed along the optical axis, the outline of each tapered light-blocking structure may have a first curved segment and a second curved segment. The center of the radius of curvature of the first curved segment may be farther away from the optical axis than the first curved segment. The center of the radius of curvature of the second curved segment may be closer to the optical axis than the second curved segment. The first curved segment and the second curved segment may be directly connected, or they may be connected by an additional straight segment; this invention is not limited thereto. The first curved segment may be closer to the optical axis than the second curved segment, and both the first and second curved segments may each form a curved surface on their inner annular surfaces. Please refer to... Figure 6 The diagram illustrates a curved surface CS formed by a first curved segment CP1 and a second curved segment CP2 according to a first embodiment of the present invention. The arrangement of the curved segments makes stray light less likely to be reflected from the inner ring surface. Furthermore, the curved segments facilitate manufacturing, improving the production yield and enabling mass production of the light-shielding element. The second curved segment may be located on one side of the first curved segment and connected to the first curved segment of other adjacent tapered light-shielding structures.

[0112] The micron structure can be disposed on at least one of the object-side and image-side surfaces of the light-shielding element, and the micron structure can have multiple protrusions. Please refer to [reference needed]. Figure 5 The structural height H1 of the micrometer structure is the vertical height from the bottom to the top of the protrusion. The average height of at least three or more protrusions in the micrometer structure can be greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers. This allows stray light to be scattered, reducing the intensity of stray light reflection. When viewed in cross-section from the light-shielding element, the protrusions of the micrometer structure can appear arc-shaped. Alternatively, the micrometer structure can consist of multiple spherical particles embedded in the surface of the light-shielding element, with some of the spherical particles protruding from the surface, creating multiple arc-shaped protrusions on the surface of the light-shielding element. Please refer to... Figure 3 , Figure 5 , Figure 7 and Figure 8 The illustration shows a microstructure 115 disposed on the object side 111 and the image side 112 according to a first embodiment of the present invention and having a plurality of protrusions PR.

[0113] The nanostructure layer can be disposed at least on the curved surface formed by the first and second curved segments on the inner ring surface, and the nanostructure layer has multiple ridge-like protrusions extending non-directionally from the curved surface. Please refer to... Figure 5 The structural height of the nanostructure layer can be defined as the vertical height H2 from the absolute bottom (foot portion) of the ridge to the top (summit portion) of the ridge when viewed in cross-section (destructive measurement); or, please refer to... Figure 4 The structural height of the nanostructure layer can also be the vertical height H3 from the relative bottom of the ridge protrusions (the valley between two mountains) to the top of the ridge protrusions (the mountain peak) when viewed from the outer surface (non-destructive measurement), but the present invention is not limited thereto. The average structural height (i.e., the average of H2 or H3) of at least three or more ridge protrusions in the nanostructure layer can be greater than or equal to 98 nanometers and less than or equal to 350 nanometers. When viewed in cross-section from the light-shielding element, the ridge protrusions exhibit a shape that is wider at the bottom and narrower at the top, like a mountain ridge. This ridge-like structure allows the equivalent refractive index of the nanostructure layer to gradually decrease from the bottom (foot part) to the top (mountain peak), and can form a rough surface to reduce stray light reflection. Furthermore, the nanostructure layer can be placed on the tapered light-shielding structure on the inner ring surface, which can further reduce the reflectivity of the inner ring surface and reduce the impact of stray light on imaging quality. In particular, the nanostructure layer can be placed only on the curved surface of the inner ring surface, which can shorten the production time and facilitate mass production. The nanostructure layer can extend to at least one of the object-side and image-side surfaces. By further embedding the nanostructure layer on at least one of the object-side and image-side surfaces, the reflectivity of at least one of these surfaces is reduced, thereby improving image quality. The nanostructure layer can extend to either the object-side or image-side surface. By further embedding the nanostructure layer on either the object-side or image-side surface, both image quality and production speed can be balanced. Furthermore, the nanostructure layer can cover the micron structure to further reduce the intensity of scattered light. By combining two anti-reflective structures of different scales, the anti-reflective performance of the light-shielding element can be further improved. The nanostructure layer can be uniformly distributed on the surface of the micron structure, and when the structural height of the nanostructure layer is less than the structural height of the micron structure, the shape of the micron structure can still be retained, allowing the micron structure to still have the function of scattering light. Please refer to [reference needed]. Figure 4 , Figure 5 , Figures 9 to 12 The illustration shows a nanostructure layer 116 disposed on the object side 111, the image side 112 and the inner annular surface 113 according to the first embodiment of the present invention, having ridge-like protrusions RLP and covering the object side 111 and the image side 112 with microstructures 115.

[0114] Compared to conventional techniques where stray light is easily reflected from the inner surface of the light-shielding element, please refer to... Figure 1 and Figure 2 The illustration shows a light-shielding element (e.g., a light-shielding element according to a first embodiment of the present invention). Figure 1 and Figure 2 The present invention discloses a light-shielding element 11 (a light-shielding plate 11). A nanostructure layer 116 is provided on the inner annular surface 113 of the light-shielding element 11 to reduce surface reflectivity, making it less likely for stray light to form from the light-shielding element and affect image quality. Furthermore, the present invention discloses a tapered light-shielding structure 114 with a curved surface CS to alter or disrupt the smooth inner annular surface 113 of the light-shielding element 11. A nanostructure layer 116 can also be further provided on the curved surface CS of the tapered light-shielding structure 114 to reduce surface reflectivity, making it less likely for stray light to form from the light-shielding element and affect image quality. For example, the present invention discloses a lens internal design in which a subwavelength structure (including but not limited to an alumina (Al2O3) nanostructure layer deposited on the surface using atomic layer deposition) is added to the surface of the light-shielding element, and this is used to design a light-shielding mechanism. The light-shielding element can be... Figure 1 11. Light-blocking sheet in the middle Figure 16 Spacer (SP) and retainer (Retainer) in the middle Figure 22 The barrel 43 in the middle, even with Figure 34 The lens barrel 63, which integrates the voice coil motor (VCM), forms light-blocking measures at specific optical path positions through mutual matching or unit-type arrangements, thereby efficiently controlling non-imaging light within the lens. This invention is also applicable to, but not limited to, electronic devices such as mobile phones (dual-lens or multi-lens), tablet computers, personal video recorders, and wearable devices.

[0115] The thickness of the light-shielding element is T, which satisfies the following condition: 2 [micrometers] ≤ T ≤ 88 [micrometers]. This allows for the reduction of surface reflection by incorporating nanoscale nanostructure layers while maintaining a thin and light-shielding element. When the light-shielding element is a light-shielding sheet, please refer to... Figure 5 The diagram illustrates T according to the first embodiment of the present invention. When the light-shielding element is a spacer element, please refer to... Figure 20 The figure shows T' according to the third embodiment of the present invention.

[0116] The number of tapered light-blocking structures is N, which satisfies the following condition: 39 ≤ N ≤ 147. This reduces stray light reflection and helps improve manufacturing quality.

[0117] The radius of curvature of the first curve segment is R. VC The radius of curvature of the second curve segment is R. C The radius of the light-transmitting aperture is R. L It can satisfy the following condition: 0.005 [mm] ≤ R VC≤0.37 mm; 0.008 mm ≤R C ≤0.42 mm; 0.3 ≤ R C / R VC ≤35; 0.05≤(R) VC / R L )×1.02π 4 ≤34; and 0.11≤(R C / R L )×1.02π 4 ≤49. This allows for appropriate passivation of the inner ring surface, further reducing the likelihood of stray light being reflected from it. When the light-shielding element is a light-shielding plate, please refer to... Figure 2 R is illustrated according to the first embodiment of the present invention. VC With R C When the light-shielding element is a light-shielding sheet, please refer to... Figure 5 R is illustrated according to the first embodiment of the present invention. L .

[0118] The surface of at least one of the object side and the image side, which has a nanostructure layer, has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It can satisfy the following conditions: R 7590 ≤0.65%. This allows the nanostructured layer to maintain low reflectivity across a wide spectral band compared to conventional multilayer films, and also maintains low reflectivity for long-wavelength light, thus meeting the needs of some special imaging lenses, such as ToF sensing lenses. However, this invention is not limited to this application. The following conditions may also be met: R 7590 ≤0.5%. Wherein, the surface of at least one of the object-side and image-side surfaces having a nanostructure layer has an average reflectance of R for light with wavelengths from 380 nm to 400 nm. 3840 It can satisfy the following conditions: R 3840 ≤0.75%. Maintaining low reflectivity in this wavelength band improves image quality. Specifically, the surface of at least one of the object-side and image-side surfaces having a nanostructure layer has an average reflectivity of R for light with wavelengths from 400 nm to 700 nm. 4070 It can satisfy the following conditions: R 4070 ≤0.5%. Maintaining low reflectivity in this band can improve image quality. Please refer to... Figure 38 This invention illustrates experimental data on the reflectance of surfaces with nanostructured layers on two reference films for various wavelengths of light. Each reference film is a plastic substrate with a nanostructured layer disposed on its surface. Figure 38 The experimental data shows that one of the reference films (reference film-1) satisfies the following condition: R 7590=0.14%; R 3840 =0.08%; and R 4070 =0.03%, while another reference piece (reference piece-2) satisfies the following condition: R 7590 =0.14%; R 3840 =0.07%; and R 4070 =0.03%. Figure 38 The reflectivity experimental data of the reference film can be used as a reflectivity reference for nanostructure layers set on the surface of various optical components.

[0119] The lens assembly may comprise multiple lenses, and at least one of these lenses may also have the aforementioned nanostructure layer. Since stray light can form between the lens and the light-shielding element, providing nanostructure layers in both the lens and the light-shielding element can reduce the intensity of stray light reflection and minimize its impact on image quality. These lenses may include a first lens and a second lens, and the light-shielding element, the first lens, and the second lens are arranged sequentially along the optical axis from the object side to the image side of the imaging lens. Alternatively, the lens located on the image side of the light-shielding element can be defined as the first lens, and the lens located on the image side of the first lens can be defined as the second lens. Please refer to [reference needed]. Figure 16 The illustration shows a light-shielding sheet 31, a first lens 321, and a second lens 322 arranged sequentially along the optical axis OA according to a third embodiment of the present invention.

[0120] The lens barrel may include a cylindrical portion and a plate-shaped portion. The cylindrical portion may surround the optical axis with the optical axis as its center. The plate-shaped portion may be connected to the cylindrical portion and may extend in a direction close to the optical axis to form an aperture. The plate-shaped portion may have a supporting surface and an inner wall surface. When the light-shielding element is a light-shielding plate, a spacer element, or a fixing element, the supporting surface may be in solid contact with the light-shielding element. The inner wall surface may extend from the aperture towards the supporting surface. The inner wall surface and the light-shielding element may be spaced apart by a distance in a direction parallel to the optical axis. This forms a light trap structure, causing stray light to be reflected between them, thereby improving image quality. The distance may gradually decrease in a direction away from the optical axis. Please refer to [reference needed]. Figure 16 The illustration shows a cylindrical portion 331 surrounding the optical axis OA with the optical axis OA as the axis, a plate-shaped portion 332 extending in a direction close to the optical axis OA and forming an aperture AS, and an interval D between the inner wall surface 3322 and the light-shielding plate 31 in a direction parallel to the optical axis OA, according to the third embodiment of the present invention.

[0121] The maximum spacing is Dmax, and the thickness of the second lens along the optical axis is CT2, which satisfies the following conditions: 0.26 ≤ Dmax / CT2 ≤ 3.2; and 0.08 [mm] ≤ CT2 ≤ 0.82 [mm]. Please refer to [reference needed]. Figure 16 The diagram illustrates Dmax and CT2 according to a third embodiment of the present invention.

[0122] The various technical features in the imaging lens of the present invention can be combined and configured to achieve the corresponding effects.

[0123] Based on the above implementation methods, specific embodiments are presented below and described in detail with reference to the accompanying drawings.

[0124] <First Embodiment>

[0125] Please refer to Figures 1 to 12 ,in Figure 1 This is a side cross-sectional view of the imaging lens according to the first embodiment of the present invention. Figure 2 yes Figure 1 A top-view schematic diagram of the lens hood of an imaging lens. Figure 3 yes Figure 2 A schematic diagram of the AA area of ​​the light-blocking sheet magnified 3000 times to the actual scale. Figure 4 yes Figure 3 A schematic diagram of region AA and region BB magnified 30,000 times according to the actual scale. Figure 5 yes Figure 2 A side sectional view of the light-shielding plate cut along line segment 5-5. Figure 6 yes Figure 1 A three-dimensional diagram of the light-shielding plate of an imaging lens. Figure 7 yes Figure 6 A schematic diagram of the CC region of the light-blocking plate magnified 3000 times to its actual scale. Figure 8 yes Figure 7 A schematic diagram of the CC region and the DD region magnified 5000 times according to the actual scale. Figure 9 yes Figure 8 A schematic diagram of the EE region of the DD region, magnified 30,000 times to the actual scale. Figure 10 yes Figure 8 A schematic diagram of the DD region and FF region magnified 30,000 times according to the actual scale. Figure 11 yes Figure 8 The diagram showing the GG region of the DD region magnified 30,000 times to the actual scale, and Figure 12 yes Figure 11 A schematic diagram of the GG region and HH region magnified 100,000 times according to the actual scale.

[0126] In this embodiment, an imaging lens 1 passes through an optical axis OA. The imaging lens 1 includes a light-shielding plate 11, a lens group 12, a lens barrel 13, and an imaging surface 14. The light-shielding plate 11 and the lens group 12 are housed within the lens barrel 13. After entering the lens barrel 13, light passes through the light-shielding plate 11 and the lens group 12 to become imaging light and is imaged onto the imaging surface 14. It is worth noting that the components within the lens barrel 13 are not limited to the outlines shown in the accompanying drawings.

[0127] The light-shielding plate 11 is a multi-layer structure consisting of a plastic base layer L1 covered by two covering layers L2 on its object side and image side. The light-shielding plate 11 includes an object side 111, an image side 112, an inner ring surface 113, multiple tapered light-shielding structures 114, a micron structure 115, and a nanostructure layer 116. The object side 111 is perpendicular to and surrounds the optical axis OA. The image side 112 is opposite to the object side 111, and is closer to the image side of the imaging lens 1 than the object side 111. The inner ring surface 113 connects the object side 111 and the image side 112. The inner ring surface 113 is cylindrical and surrounds the optical axis OA, defining a light-passing aperture LPO.

[0128] like Figure 2 As shown, the inner ring surface 113 may be provided with a tapered light-blocking structure 114. The tapered light-blocking structure 114 protrudes from the inner ring surface 113 and extends towards the optical axis OA in a tapered manner, and the tapered light-blocking structure 114 is periodically arranged around the optical axis OA. The tapered light-blocking structure 114 and the rest of the light-blocking sheet 11 are integrally formed.

[0129] like Figure 2 As shown, when viewed along the optical axis OA, the outline of each tapered light-blocking structure 114 has a first curved segment CP1 and a second curved segment CP2. The center of the radius of curvature of the first curved segment CP1 is farther from the optical axis OA than the first curved segment CP1. The center of the radius of curvature of the second curved segment CP2 is closer to the optical axis OA than the second curved segment CP2. The first curved segment CP1 and the second curved segment CP2 are connected by an additional straight line segment (not otherwise labeled). The first curved segment CP1 is closer to the optical axis OA than the second curved segment CP2, and both the first curved segment CP1 and the second curved segment CP2 form a curved surface CS on the inner annular surface 113. Furthermore, the second curved segment CP2 connects to the first curved segment CP1 of the adjacent tapered light-blocking structure 114 by an additional straight line segment. In other words, the first curved segment CP1 and the second curved segment CP2 are alternately arranged.

[0130] like Figure 5 As shown, the microstructure 115 is disposed on the object-side surface 111 and the image-side surface 112 of the light-shielding plate 11, but not on the inner annular surface 113. The microstructure 115 has multiple protrusions PR, and the structural height of the microstructure 115 is H1. The average structural height of at least three or more protrusions PR in the microstructure 115 is greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers. When viewed in cross-section from the light-shielding plate 11, the protrusions PR of the microstructure 115 are arc-shaped.

[0131] like Figure 2 , Figure 5 and Figure 6As shown, the nanostructure layer 116 is disposed on the tapered light-shielding structure 114 of the inner annular surface 113 (including the curved surface CS formed by the first curved segment CP1 and the second curved segment CP2), and can further extend to the object side surface 111 and the image side surface 112, uniformly covering the microstructure 115. Alternatively, the nanostructure layer 116 is disposed on the tapered light-shielding structure 114 of the inner annular surface 113 and on the microstructure 115 of the object side surface 111 and the image side surface 112. Please refer to... Figure 5 The nanostructure layer 116 has multiple ridge-like protrusions RLP extending non-directionally from the curved surface CS, and the structural height of the nanostructure layer 116 is the vertical height H2 from the absolute bottom (foot portion) of the ridge-like protrusions RLP to the top (summit portion) of the ridge-like protrusions RLP when viewed in cross-section (destructive measurement); or, please refer to Figure 4 The structural height of the nanostructure layer 116 can also be the vertical height H3 from the relative bottom (valley portion between two mountains) of the ridge-like protrusions RLP to the top (summit portion) of the ridge-like protrusions RLP when viewed from the outer surface (non-destructive measurement), but the present invention is not limited thereto. The average structural height of at least three or more ridge-like protrusions RLP in the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers. When viewed in cross-section from the light-shielding sheet 11, the ridge-like protrusions RLP exhibit a shape that is wider at the bottom and narrower at the top, like a mountain ridge. This ridge-like structure allows the equivalent refractive index of the nanostructure layer 116 to gradually decrease from the bottom (foot portion) to the top (summit portion), and can form a rough surface to reduce the reflection of stray light.

[0132] Please refer to Table 1, which is... Figure 4 The structural height H3 of the ridge-like protrusions RLP in the medium nanostructure layer 116.

[0133]

[0134] The thickness of the light-shielding sheet 11 is T, which satisfies the following condition: T = 23 [micrometers].

[0135] The number of tapered shading structures 114 is N, which satisfies the following condition: N = 60.

[0136] The radius of curvature of the first curve segment CP1 is R. VC The radius of curvature of the second curve segment CP2 is R. C The radius of the light-transmitting aperture LPO is R. L It satisfies the following conditions: R VC = 0.05 [mm]; R C = 0.05 [mm]; R L = 0.917 [mm]; R C / R VC =1; (R) VC / RL )×1.02π 4 =5.42; and (R C / R L )×1.02π 4 =5.42.

[0137] The average reflectance of the object-side surface 111 and image-side surface 112, which have nanostructured layers 116, to light with wavelengths from 750 nm to 900 nm is R. 7590 It satisfies the following conditions: R 7590 ≤0.65%. The average reflectance of the object side 111 and image side 112, on which the nanostructure layer 116 is provided, to light with wavelengths from 380 nm to 400 nm is R. 3840 It satisfies the following conditions: R 3840 ≤0.75%. The average reflectance of the object side 111 and image side 112 of the surface with the nanostructure layer 116 to light with wavelengths from 400 nm to 700 nm is R. 4070 It can satisfy the following conditions: R 4070 ≤0.5%.

[0138] <Second Embodiment>

[0139] Please refer to Figures 13 to 15 ,in Figure 13 This is a side cross-sectional view of the imaging lens according to the second embodiment of the present invention. Figure 14 yes Figure 13 A top-view schematic diagram of the lens hood of the imaging lens, and Figure 15 yes Figure 14 A side view sectional view of the light-blocking sheet cut along line segment 15-15.

[0140] In this embodiment, an imaging lens 2 passes through an optical axis OA. The imaging lens 2 includes a light-shielding plate 21, a lens group 22, a lens barrel 23, and an imaging surface 24. The light-shielding plate 21 and the lens group 22 are housed within the lens barrel 23. After entering the lens barrel 23, light passes through the light-shielding plate 21 and the lens group 22 to become imaging light and is imaged onto the imaging surface 24. It is worth noting that the components within the lens barrel 23 are not limited to the outlines shown in the accompanying drawings.

[0141] The light-shielding plate 21 is a multi-layer structure consisting of a plastic base layer L1 covered by two covering layers L2 on its object side and image side. The light-shielding plate 21 includes an object side surface 211, an image side surface 212, an inner ring surface 213, multiple tapered light-shielding structures 214, a micron structure 215, and a nanostructure layer 216. The object side surface 211 is vertically positioned and surrounds the optical axis OA. The image side surface 212 is positioned opposite to the object side surface 211, and is closer to the image side of the imaging lens 2 than the object side surface 211. The inner ring surface 213 connects the object side surface 211 and the image side surface 212. The inner ring surface 213 is a tapered surface, surrounds the optical axis OA, and defines a light-passing aperture LPO at its pointed end near the object side.

[0142] like Figure 14 As shown, the inner ring surface 213 may be provided with a tapered light-blocking structure 214. The tapered light-blocking structure 214 protrudes from the inner ring surface 213 and extends towards the optical axis OA in a tapered manner, and the tapered light-blocking structure 214 is periodically arranged around the optical axis OA. The tapered light-blocking structure 214 and the rest of the light-blocking sheet 21 are integrally formed.

[0143] like Figure 14 As shown, when viewed along the optical axis OA, the outline of each tapered light-blocking structure 214 has a first curved segment CP1 and a second curved segment CP2. The center of the radius of curvature of the first curved segment CP1 is farther away from the optical axis OA than the first curved segment CP1. The center of the radius of curvature of the second curved segment CP2 is closer to the optical axis OA than the second curved segment CP2. The first curved segment CP1 and the second curved segment CP2 are directly connected. The first curved segment CP1 is closer to the optical axis OA than the second curved segment CP2, and the first curved segment CP1 and the second curved segment CP2 each form a curved surface (not otherwise labeled) on the inner annular surface 213. Furthermore, the second curved segment CP2 connects to the first curved segment CP1 of the adjacent tapered light-blocking structure 214. In other words, the first curved segment CP1 and the second curved segment CP2 are alternately arranged.

[0144] like Figure 15 As shown, the microstructure 215 is disposed on the object-side surface 211 and the image-side surface 212 of the light-shielding plate 21, but not on the inner annular surface 213. The microstructure 215 has multiple protrusions PR, and the average height of at least three or more protrusions PR in the microstructure 215 is greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers. When viewed in cross-section from the light-shielding plate 21, the protrusions PR of the microstructure 215 are arc-shaped.

[0145] like Figure 14 and Figure 15As shown, the nanostructure layer 216 is disposed on the tapered light-shielding structure 214 of the inner ring surface 213 (including the curved surface formed by the first curve segment CP1 and the second curve segment CP2). Alternatively, the nanostructure layer 216 is disposed only on the tapered light-shielding structure 214 of the inner ring surface 213. Please refer to... Figure 15 The nanostructure layer 216 has a plurality of ridge protrusions RLP extending non-directionally from the curved surface, and the average structural height of at least three or more ridge protrusions RLP in the nanostructure layer 216 is greater than or equal to 98 nm and less than or equal to 350 nm.

[0146] The thickness of the light-shielding sheet 21 is T, which satisfies the following condition: T = 16 micrometers.

[0147] The number of tapered shading structures 214 is N, which satisfies the following condition: N = 72.

[0148] The radius of curvature of the first curve segment CP1 is R. VC The radius of curvature of the second curve segment CP2 is R. C The radius of the light-transmitting aperture LPO is R. L It satisfies the following conditions: R VC = 0.01 [mm]; R C = 0.14 [mm]; R L = 1.6 [mm]; R C / R VC =14; (R) VC / R L )×1.02π 4 =0.62; and (R C / R L )×1.02π 4 =8.69.

[0149] <Third Embodiment>

[0150] Please refer to Figures 16 to 21 ,in Figure 16 This is a side cross-sectional view of the imaging lens according to the third embodiment of the present invention. Figure 17 yes Figure 16 A top-view schematic diagram of the lens hood of an imaging lens. Figure 18 yes Figure 17 A side sectional view of the light-shielding plate cut along line segment 18-18. Figure 19 yes Figure 16 A downward-view schematic diagram of the spacing element of the imaging lens. Figure 20 yes Figure 19 A side sectional view of the spacer element cut along line segment 20-20, and Figure 21 yes Figure 16 A three-dimensional schematic diagram of the spacer element of the imaging lens.

[0151] In this embodiment, an imaging lens 3 passes through an optical axis OA. The imaging lens 3 includes a light-shielding plate 31, a lens group 32, a spacer element SP, a fixing element RT, a lens barrel 33, and an imaging surface 34. The light-shielding plate 31, the lens group 32, the spacer element SP, and the fixing element RT are housed within the lens barrel 33. After entering the lens barrel 33, light passes through the light-shielding plate 31, the lens group 32, the spacer element SP, and the fixing element RT, becoming imaging light that is imaged onto the imaging surface 34. It is worth noting that the components within the lens barrel 33 are not limited to the outlines shown in the accompanying drawings.

[0152] The light-shielding plate 31 is a single-layer structure with a metal base layer L1 coated with black pigment (not shown). The light-shielding plate 31 includes an object-side surface 311, an image-side surface 312, an inner ring surface 313, multiple tapered light-shielding structures 314, and a nanostructure layer 316. The object-side surface 311 is vertically positioned and surrounds the optical axis OA. The image-side surface 312 is positioned opposite to the object-side surface 311, and is closer to the image side of the imaging lens 3 than the object-side surface 311. The inner ring surface 313 connects the object-side surface 311 and the image-side surface 312. The inner ring surface 313 is a double-conical surface, surrounds the optical axis OA, and defines a light-passing aperture LPO at its central tip.

[0153] like Figure 17 As shown, the inner ring surface 313 may be provided with a tapered light-blocking structure 314. The tapered light-blocking structure 314 protrudes from the inner ring surface 313 and extends towards the optical axis OA in a tapered manner, and the tapered light-blocking structure 314 is periodically arranged around the optical axis OA. The tapered light-blocking structure 314 and the rest of the light-blocking sheet 31 are integrally formed.

[0154] like Figure 17 As shown, when viewed along the optical axis OA, the outline of each tapered light-blocking structure 314 has a first curved segment CP1 and a second curved segment CP2. The center of the radius of curvature of the first curved segment CP1 is farther away from the optical axis OA than the first curved segment CP1. The center of the radius of curvature of the second curved segment CP2 is closer to the optical axis OA than the second curved segment CP2. The first curved segment CP1 and the second curved segment CP2 are connected by an additional straight line segment (not otherwise labeled). The first curved segment CP1 is closer to the optical axis OA than the second curved segment CP2, and both the first curved segment CP1 and the second curved segment CP2 form a curved surface (not otherwise labeled) on the inner annular surface 313. Furthermore, the second curved segment CP2 connects to the first curved segment CP1 of the adjacent tapered light-blocking structure 314 by an additional straight line segment. In other words, the first curved segment CP1 and the second curved segment CP2 are alternately arranged.

[0155] like Figure 17 and Figure 18As shown, the nanostructure layer 316 is disposed on the tapered light-shielding structure 314 of the inner annular surface 313 (including the curved surface formed by the first curved segment CP1 and the second curved segment CP2), and can further extend to the object side 311 and the image side 312. Alternatively, the nanostructure layer 316 is disposed on the tapered light-shielding structure 314 of the inner annular surface 313, as well as on the object side 311 and the image side 312. The nanostructure layer 316 has multiple ridge-like protrusions (not shown separately) extending non-directionally from the curved surface, and the average height of at least three or more ridge-like protrusions in the nanostructure layer 316 is greater than or equal to 98 nanometers and less than or equal to 350 nanometers.

[0156] The thickness of the light-shielding sheet 31 is T, which satisfies the following condition: T = 20 micrometers.

[0157] The number of tapered shading structures 314 is N, which satisfies the following condition: N = 90.

[0158] The radius of curvature of the first curve segment CP1 is R. VC The radius of curvature of the second curve segment CP2 is R. C The radius of the light-transmitting aperture LPO is R. L It satisfies the following conditions: R VC = 0.05 [mm]; R C = 0.075 [mm]; R L = 1.98 [mm]; R C / R VC =1.5; (R) VC / R L )×1.02π 4 =2.51; and (R C / R L )×1.02π 4 =3.76.

[0159] The average reflectance of the object-side surface 311 and image-side surface 312, which have nanostructured layers 316, to light with wavelengths from 750 nm to 900 nm is R. 7590 It satisfies the following conditions: R 7590 ≤0.65%. The average reflectance of the object side 311 and image side 312, on which the nanostructure layer 316 is provided, to light with wavelengths from 380 nm to 400 nm is R. 3840 It satisfies the following conditions: R 3840 ≤0.75%. The average reflectance of the object side 311 and image side 312, on which the nanostructure layer 316 is provided, to light with wavelengths from 400 nm to 700 nm is R. 4070 It can satisfy the following conditions: R 4070 ≤0.5%.

[0160] The lens group 32 includes a first lens 321 and a second lens 322, and the light shield 31, the first lens 321 and the second lens 322 are arranged sequentially from the object side to the image side of the imaging lens 3 along the optical axis OA.

[0161] The lens barrel 33 includes a cylindrical portion 331 and a plate-shaped portion 332. The cylindrical portion 331 surrounds the optical axis OA. The plate-shaped portion 332 is connected to the cylindrical portion 331 and extends towards the optical axis OA to form an aperture AS. The plate-shaped portion 332 has a bearing surface 3321 and an inner wall surface 3322. The bearing surface 3321 is in solid contact with the light-shielding plate 31. The inner wall surface 3322 extends from the aperture AS towards the bearing surface 3321. The inner wall surface 3322 and the light-shielding plate 31 are separated by a distance D in a direction parallel to the optical axis OA, and the distance D gradually decreases in the direction away from the optical axis OA.

[0162] The maximum value of the spacing distance D is Dmax, and the thickness of the second lens 322 along the optical axis OA is CT2, which satisfies the following conditions: Dmax = 0.47 [mm]; CT2 = 0.255 [mm]; and Dmax / CT2 = 1.843.

[0163] The spacer element SP can also be configured with a structure similar to the nanostructure layer 316 described above to reduce stray light reflection within the lens barrel 33. Specifically, the spacer element SP includes an object-side surface SP_1, an image-side surface SP_2, an inner annular surface SP_3, a micron-structure SP_5, and a nanostructure layer SP_6. The object-side surface SP_1 is positioned perpendicular to and surrounds the optical axis OA. The image-side surface SP_2 is positioned opposite to the object-side surface SP_1, and the image-side surface SP_2 is closer to the image side of the imaging lens 3 than the object-side surface SP_1. The inner annular surface SP_3 connects the object-side surface SP_1 and the image-side surface SP_2, and the inner annular surface SP_3 surrounds the optical axis OA and defines a light-passing aperture (not otherwise labeled) as the minimum aperture of the spacer element SP.

[0164] like Figure 19 , Figure 20 and Figure 21 As shown, the inner annular surface SP_3 can be provided with a micron-sized structure SP_5. For example... Figure 19 and Figure 21 As shown, the micron structure SP_5 has multiple triangular prism protrusions (unlabeled), and the triangular prism protrusions of the micron structure SP_5 are periodically arranged along the circumferential direction with the optical axis OA as the center.

[0165] like Figure 20 and Figure 21 As shown, the nanostructure layer SP_6 is disposed on the inner ring surface SP_3 to cover and substantially contact the microstructure SP_5 on the inner ring surface SP_3.

[0166] like Figure 20 and Figure 21 As shown, the nanostructure layer SP_6 is uniformly distributed on the surface of the microstructure SP_5 and retains the shape of the microstructure SP_5.

[0167] The fixing element RT can also be provided with a structure similar to the nanostructure layer 316 or the nanostructure layer SP_6 described above, which will not be elaborated here.

[0168] <Fourth Embodiment>

[0169] Please refer to Figures 22 to 30 ,in Figure 22 This is a side cross-sectional view of the imaging lens according to the fourth embodiment of the present invention. Figure 23 yes Figure 22 A top-view schematic diagram of the lens hood of an imaging lens. Figure 24 yes Figure 23 A side sectional view of the light-shielding plate cut along line segment 24-24. Figure 25 yes Figure 22 A top-view diagram of the lens barrel of the imaging lens. Figure 26 yes Figure 25 A side view sectional view of the microscope tube cut along line segment 26-26. Figure 27 yes Figure 22 A three-dimensional schematic diagram of the lens barrel of the imaging lens after cross-section. Figure 28 yes Figure 27 A schematic diagram of region II of the sectional microscope tube, magnified 3000 times to scale. Figure 29 yes Figure 28 The diagram of region II, specifically region JJ, is enlarged 10,000 times to scale. Figure 30 yes Figure 29 A schematic diagram of the JJ and KK regions magnified 30,000 times according to the actual scale.

[0170] In this embodiment, an imaging lens 4 passes through an optical axis OA. The imaging lens 4 includes a light-shielding plate 41, a lens group 42, a lens barrel 43, and an imaging surface 44. The light-shielding plate 41 and the lens group 42 are housed within the lens barrel 43. After entering the lens barrel 43, light passes through the light-shielding plate 41 and the lens group 42 to become imaging light and is imaged onto the imaging surface 44. It is worth noting that the components within the lens barrel 43 are not limited to the outlines shown in the accompanying drawings.

[0171] The light-shielding plate 41 is a multi-layer structure consisting of a plastic base layer L1 covered by two covering layers L2 on its object side and image side. The light-shielding plate 41 includes an object side surface 411, an image side surface 412, an inner ring surface 413, multiple tapered light-shielding structures 414, a micron structure 415, and a nanostructure layer 416. The object side surface 411 is vertically positioned and surrounds the optical axis OA. The image side surface 412 is positioned opposite to the object side surface 411, and is closer to the image side of the imaging lens 4 than the object side surface 411. The inner ring surface 413 connects the object side surface 411 and the image side surface 412. The inner ring surface 413 is a conical surface, surrounds the optical axis OA, and defines a light-passing aperture LPO at its pointed tip near the image side.

[0172] like Figure 23 and Figure 24 As shown, the inner ring surface 413 may be provided with a tapered light-blocking structure 414. The tapered light-blocking structure 414 protrudes from the inner ring surface 413 and extends towards the optical axis OA in a tapered manner, and the tapered light-blocking structure 414 is periodically arranged around the optical axis OA. The tapered light-blocking structure 414 and the rest of the light-blocking sheet 41 are integrally formed.

[0173] like Figure 23 As shown, when viewed along the optical axis OA, the outline of each tapered light-blocking structure 414 has a first curved segment CP1 and a second curved segment CP2. The center of the radius of curvature of the first curved segment CP1 is farther away from the optical axis OA than the first curved segment CP1. The center of the radius of curvature of the second curved segment CP2 is closer to the optical axis OA than the second curved segment CP2. The first curved segment CP1 and the second curved segment CP2 are directly connected. The first curved segment CP1 is closer to the optical axis OA than the second curved segment CP2, and the first curved segment CP1 and the second curved segment CP2 each form a curved surface (not otherwise labeled) on the inner annular surface 413. Furthermore, the second curved segment CP2 connects to the first curved segment CP1 of the adjacent tapered light-blocking structure 414. In other words, the first curved segment CP1 and the second curved segment CP2 are alternately arranged.

[0174] like Figure 24 As shown, the microstructure 415 is disposed on the object side 411 of the light-shielding plate 41, but not on the image side 412 or the inner annular surface 413. The microstructure 415 has multiple protrusions PR, and the average height of at least three or more of the protrusions PR in the microstructure 415 is greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers. When viewed in cross-section from the light-shielding plate 41, the protrusions PR of the microstructure 415 are arc-shaped.

[0175] like Figure 23 and Figure 24As shown, the nanostructure layer 416 is disposed on the tapered light-shielding structure 414 disposed on the inner annular surface 413 (including the curved surface formed by the first curved segment CP1 and the second curved segment CP2), and can further extend to the object side surface 411 and uniformly cover the micron structure 415. Alternatively, the nanostructure layer 416 can be described as being disposed on the tapered light-shielding structure 414 of the inner annular surface 413 and on the micron structure 415 of the object side surface 411. The nanostructure layer 416 has multiple ridge-like protrusions (not shown separately) extending non-directionally from the curved surface, and the average height of at least three or more ridge-like protrusions in the nanostructure layer 416 is greater than or equal to 98 nanometers and less than or equal to 350 nanometers.

[0176] The thickness of the light-shielding sheet 41 is T, which satisfies the following condition: T = 30 micrometers.

[0177] The number of tapered shading structures 414 is N, which satisfies the following condition: N = 60.

[0178] The radius of curvature of the first curve segment CP1 is R. VC The radius of curvature of the second curve segment CP2 is R. C The radius of the light-transmitting aperture LPO is R. L It satisfies the following conditions: R VC = 0.01 [mm]; R C = 0.04 [mm]; R L = 0.97 [mm]; R C / R VC =4; (R) VC / R L )×1.02π 4 =1.02; and (R C / R L )×1.02π 4 =4.1.

[0179] The surface of the object side 411, which has a nanostructure layer 416, has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It satisfies the following conditions: R 7590 ≤0.65%. The average reflectance of the surface 411 of the object side with the nanostructure layer 416 to light with wavelengths from 380 nm to 400 nm is R. 3840 It satisfies the following conditions: R 3840 ≤0.75%. The average reflectance of the surface 411 of the object side with the nanostructure layer 416 to light with wavelengths from 400 nm to 700 nm is R. 4070 It can satisfy the following conditions: R 4070 ≤0.5%.

[0180] The lens barrel 43 may also be provided with a structure similar to the aforementioned nanostructure layer 416 to reduce the reflection of stray light within the lens barrel 43. Specifically, the lens barrel 43 includes a cylindrical portion 431, a plate-shaped portion 432, a microstructure 435, and a nanostructure layer 436. The cylindrical portion 431 surrounds the optical axis OA with the optical axis OA as its axis. The plate-shaped portion 432 is connected to the cylindrical portion 431 and extends in a direction close to the optical axis OA to form an aperture AS. The plate-shaped portion 432 has an exposed surface 4320, a bearing surface 4321, and an inner wall surface 4322. The exposed surface 4320 is exposed to the outside. The bearing surface 4321 is in solid contact with the optical elements (not otherwise labeled) inside the lens barrel 43. The inner wall surface 4322 extends from the aperture AS toward the bearing surface 4321.

[0181] like Figure 26 As shown, the inner wall surface 4322 may be provided with a micron structure 435, and the micron structure 435 is integrally formed with the rest of the lens barrel 43. Figure 26 and Figure 28 As shown, the microstructure 435 has multiple protrusions (unlabeled).

[0182] like Figure 26 and Figure 27 As shown, in addition to being disposed on the exposed surface 4320 and the bearing surface 4321, the nanostructure layer 436 is also disposed on the inner wall surface 4322 to cover and physically contact the microstructure 435 on the inner wall surface 4322.

[0183] like Figure 26 and Figure 28 As shown, the nanostructure layer 436 is uniformly distributed on the surface of the microstructure 435 and retains the shape of the microstructure 435.

[0184] <Fifth Embodiment>

[0185] Please refer to Figures 31 to 33 ,in Figure 31 This is a side cross-sectional view of the imaging lens according to the fifth embodiment of the present invention. Figure 32 yes Figure 31 An exploded view of the imaging lens, and Figure 33 yes Figure 31 Another exploded diagram of some components of the imaging lens.

[0186] In this embodiment, an imaging lens 5 passes through an optical axis OA. The imaging lens 5 includes a light-shielding plate 51, a lens group 52, a lens barrel 53, an imaging surface 54, a reflecting element 55, and a holding member 56. The lens group 52 is housed within the lens barrel 53. The light-shielding plate 51 and the reflecting element 55 are housed within the holding member 56, and the holding member 56 is fixedly assembled with the lens barrel 53. After entering the lens barrel 53, light passes through the lens group 52, then enters the holding member 56, passes through the reflecting element 55 and the light-shielding plate 51, is deflected by the reflecting element 55, and exits the holding member 56 to become imaging light, which is then imaged onto the imaging surface 54. Specifically, the reflecting element 55 is disposed on the image side of the lens barrel 53 and has four reflecting surfaces 551. The reflecting element 55 may include multiple prisms combined to form the four reflecting surfaces 551 described above, but the present invention is not limited thereto. Figure 31 As shown, the reflecting surface 551 deflects the direction of light rays from the lens barrel 53 (i.e., deflects the optical axis OA). It is worth noting that the elements within the lens barrel 53 and the retaining member 56 are not limited by the outlines shown in the figures.

[0187] The light-shielding plate 51 includes an object-side surface 511, an image-side surface 512, an inner annular surface 513, and a nanostructure layer 516. The object-side surface 511 is vertically positioned and surrounds the optical axis OA. The image-side surface 512 is positioned opposite to the object-side surface 511, and is closer to the image side of the imaging lens 5 than the object-side surface 511. The inner annular surface 513 connects the object-side surface 511 and the image-side surface 512, and surrounds the optical axis OA, defining a light-passing aperture LPO.

[0188] A light-shielding sheet 51 is attached to one of the reflective surfaces 551 to reduce stray light generated by the reflective element 55. Specifically, a nanostructure layer 516 of the light-shielding sheet 51 is disposed on the image-side surface 512 and the inner annular surface 513 to reduce the reflection of stray light within the holding member 56.

[0189] The surface of the image side 512, which has a nanostructure layer 516, has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It satisfies the following conditions: R 7590 ≤0.65%. The average reflectance of the image-side surface 512 with the nanostructure layer 516 to light with wavelengths from 380 nm to 400 nm is R. 3840 It satisfies the following conditions: R 3840 ≤0.75%. The average reflectance of the image-side surface 512 with the nanostructure layer 516 to light with wavelengths from 400 nm to 700 nm is R. 4070 It can satisfy the following conditions: R 4070 ≤0.5%.

[0190] The retainer 56 includes a lens retaining portion 561, a base portion 562, and a nanostructure layer 566. The lens retaining portion 561 fixes the lens barrel 53. The base portion 562 extends from the lens retaining portion 561 and is closer to the imaging surface 54 than the lens retaining portion 561, so that the lens group 52 maintains a certain distance from the imaging surface 54.

[0191] The base portion 562 has an inner annular surface 5621 on its inner side. The inner annular surface 5621 faces the reflective element 55. A nanostructure layer 566 is disposed on the inner annular surface 5621 of the base portion 562 to reduce the reflection of stray light within the holder 56.

[0192] <Sixth Embodiment>

[0193] Please refer to Figures 34 to 36 ,in Figure 34 This is a side cross-sectional view of the imaging lens according to the sixth embodiment of the present invention. Figure 35 yes Figure 34 An exploded view of the imaging lens, and Figure 36 yes Figure 34 Another exploded diagram of some components of the imaging lens.

[0194] In this embodiment, an imaging lens 6 passes through an optical axis OA. The imaging lens 6 includes a light-shielding plate 61, a lens group 62, a lens barrel 63, an imaging surface 64, a fixing part 67, an elastic element group 68, and a driving part 69. The fixing part 67 includes a housing 671 and a driving retainer 672, and the housing 671 and the driving retainer 672 together form an accommodating space (not otherwise labeled). The elastic element group 68 includes an upper elastic element 681 and two lower elastic elements 682. The driving part 69 includes a plurality of magnetic elements 691 and a coil 692. The lens group 62 is housed within the lens barrel 63. The object side of the lens barrel 63 is relatively movably disposed inside the housing 671 via the upper elastic element 681. The image side of the lens barrel 63 is relatively movably disposed on the driving retainer 672 via the lower elastic elements 682, and the lens barrel 63 is supported by the driving retainer 672. A magnetic element 691 is disposed inside the housing 671. A coil 692 is disposed outside the lens barrel 63. The interaction between the magnetic element 691 and the coil 692 drives the lens barrel 63 to move relative to the housing 671, the drive holder 672, and the imaging surface 64. A light shield 61 is disposed on the image side of the drive holder 672. After entering the lens barrel 63, light passes through the lens group 62 and the light shield 61 to become imaging light, and the focusing position is adjusted by the drive unit 69 to image onto the imaging surface 64. It is worth noting that the components within the lens barrel 63 and the fixing part 67 are not limited to the outlines shown in the figures.

[0195] The light-shielding plate 61 includes an object-side surface 611, an image-side surface 612, an inner annular surface 613, and a nanostructure layer 616. The object-side surface 611 is vertically positioned and surrounds the optical axis OA. The image-side surface 612 is positioned opposite to the object-side surface 611, and is closer to the image side of the imaging lens 6 than the object-side surface 611. The inner annular surface 613 connects the object-side surface 611 and the image-side surface 612, and surrounds the optical axis OA, defining a light-passing aperture LPO.

[0196] A light-shielding plate 61 is attached to the drive retainer 672 to reduce stray light between the lens barrel 63 and the imaging surface 64. Specifically, a nanostructure layer 616 of the light-shielding plate 61 is disposed on the object side 611, the image side 612, and the inner ring surface 613 to reduce stray light reflection between the lens barrel 63 and the imaging surface 64.

[0197] The average reflectance of the object-side surface 611 and image-side surface 612, which have a nanostructure layer 616, to light with wavelengths from 750 nm to 900 nm is R. 7590 It satisfies the following conditions: R 7590 ≤0.65%. The average reflectance of the object side 611 and image side 612, on which the nanostructure layer 616 is provided, to light with wavelengths from 380 nm to 400 nm is R. 3840 It satisfies the following conditions: R 3840 ≤0.75%. The average reflectance of the object side 611 and image side 612, on which the nanostructure layer 616 is provided, to light with wavelengths from 400 nm to 700 nm is R. 4070 It can satisfy the following conditions: R 4070 ≤0.5%.

[0198] The drive holding member 672 has an inner annular surface 6721 on its inner side and includes a nanostructure layer 6722. The inner annular surface 6721 faces the optical axis OA. The nanostructure layer 6722 is disposed on the inner annular surface 6721 to reduce the reflection of stray light within the drive holding member 672.

[0199] <Seventh Embodiment>

[0200] Please refer to Figure 37 This is an exploded schematic diagram of an electronic device according to a seventh embodiment of the present invention.

[0201] In this embodiment, the electronic device 7 is a smartphone. The electronic device 7 includes an imaging lens 70a, an imaging lens 70b, an imaging lens 70c, an imaging lens 70d, a flash module, a focus assist module, an image signal processor, a display device, and an image software processor (not shown). Imaging lenses 70a, 70b, 70c, and 70d are all disposed on the same side of the electronic device 7, while the display device is disposed on the other side. Specifically, imaging lens 70a is the imaging lens 5 of the fifth embodiment, and imaging lens 70b is the imaging lens 1 of the first embodiment. However, the present invention is not limited thereto, and imaging lens 70a or imaging lens 70b may also be, for example, imaging lenses from other embodiments of the present invention described above.

[0202] Imaging lens 70a is an ultra-telephoto telephoto lens, imaging lens 70b is a telephoto telephoto lens, imaging lens 70c is a wide-angle main lens, and imaging lens 70d is an ultra-wide-angle lens. The angle of view of imaging lens 70a is, for example, 5 to 30 degrees, the angle of view of imaging lens 70b is, for example, 30 to 60 degrees, the angle of view of imaging lens 70c is, for example, 65 to 90 degrees, and the angle of view of imaging lens 70d is, for example, 93 to 175 degrees. In this embodiment, imaging lenses 70a, 70b, 70c, and 70d have different angles of view, allowing the electronic device 7 to provide different magnifications to achieve optical zoom shooting effects. Furthermore, imaging lens 70a is an ultra-telephoto telephoto lens with a reflective element 55, which is beneficial for the thinning of the electronic device 7. The above-described electronic device 7 is an example containing multiple imaging lenses 70a, 70b, 70c, and 70d, but the number and configuration of the imaging lenses are not intended to limit the invention.

[0203] When the user photographs a subject, the electronic device 7 uses imaging lenses 70a, 70b, 70c, or 70d to focus light and capture an image. It then activates the flash module for supplemental lighting and uses the subject distance information provided by the focus assist module for rapid focusing. The image signal processor further optimizes the image to enhance the image quality produced by the imaging lenses and provides zoom functionality. The focus assist module can employ an infrared or laser focus assist system for rapid focusing. The display device can use a touchscreen or a physical shooting button, combined with the diverse functions of the image software processor for image capture and processing. The image processed by the image software processor can then be displayed on the display device.

[0204] It should be noted that, Figure 37 The lens cover being separated from the main body is only for the purpose of illustrating the lens module inside the electronic device 7, and does not mean that the lens cover is detachable. This invention is not limited thereto.

[0205] The imaging lens of this invention is not limited to application in smartphones. It can also be applied to mobile focusing systems as needed, offering both excellent aberration correction and good image quality. For example, the imaging lens can be used in a wide range of electronic devices, including 3D image capture, digital cameras, mobile devices, tablet computers, smart TVs, network monitoring equipment, dashcams, reversing cameras, multi-lens devices, recognition systems, motion-sensing game consoles, and wearable devices. The aforementioned electronic devices are merely illustrative examples of practical applications of this invention and do not limit the scope of application of the imaging lens.

[0206] Although the present invention has been disclosed above with reference to the foregoing embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention shall be determined by the scope of protection of the appended claims.

Claims

1. An imaging lens, characterized in that, The imaging lens, passing through an optical axis, comprises: A light-blocking sheet, comprising: The side of an object is positioned perpendicularly to and around the optical axis; An image side is disposed opposite to the object side, and the image side is closer to the image side of the imaging lens than the object side; An inner annular surface connects the object side surface and the image side surface, and the inner annular surface surrounds the optical axis and defines a light-transmitting aperture; Multiple tapered light-blocking structures are disposed on the inner annular surface. Each tapered light-blocking structure protrudes from the inner annular surface and gradually tapers towards the optical axis. The tapered light-blocking structures are periodically arranged around the optical axis. When viewed along the optical axis, the outline of each tapered light-blocking structure has a first curved segment and a second curved segment. The first curved segment is closer to the optical axis than the second curved segment, and both the first and second curved segments form a curved surface on the inner annular surface. A nanostructure layer is disposed at least on the curved surface formed by the first curve segment and the second curve segment, and the nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the curved surface; The ridge-like protrusions are wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers.

2. The imaging lens according to claim 1, characterized in that, The light-shielding sheet is made of plastic.

3. The imaging lens according to claim 2, characterized in that, The center of the radius of curvature of the first curve segment is farther away from the optical axis than the first curve segment, and the radius of curvature of the first curve segment is R. VC It satisfies the following conditions: 0.005 mm ≤ R VC ≤ 0.37 mm.

4. The imaging lens according to claim 2, characterized in that, The center of the radius of curvature of the second curve segment is closer to the optical axis than the second curve segment itself, and the radius of curvature of the second curve segment is R. C It satisfies the following conditions: 0.008 mm ≤ R C ≤ 0.42 mm.

5. The imaging lens according to claim 2, characterized in that, The center of the radius of curvature of the first curve segment is farther away from the optical axis than the first curve segment, while the center of the radius of curvature of the second curve segment is closer to the optical axis than the second curve segment. The radius of curvature of the first curve segment is R. VC The radius of curvature of the second curve segment is R. C It satisfies the following conditions: 0.3 ≤ R C / R VC ≤ 35。 6. The imaging lens according to claim 2, characterized in that, The nanostructure layer further extends to at least one of the object side and the image side.

7. The imaging lens according to claim 6, characterized in that, The nanostructure layer further extends to one of the object side and the image side.

8. The imaging lens according to claim 2, characterized in that, The light-shielding sheet further includes a micrometer structure disposed on at least one of the object side and the image side, the micrometer structure having a plurality of protrusions, and the average height of the micrometer structure being greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers.

9. The imaging lens according to claim 2, characterized in that, The tapered light-blocking structure is integrally formed with the rest of the light-blocking sheet.

10. The imaging lens according to claim 2, characterized in that, The number of tapered light-blocking structures is N, and they satisfy the following condition: 39 ≤ N ≤ 147。 11. The imaging lens according to claim 6, characterized in that, The surface of at least one of the object-side and image-side surfaces having the nanostructure layer has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It satisfies the following conditions: R 7590 ≤ 0.65%。 12. The imaging lens according to claim 6, characterized in that, The surface of at least one of the object-side surface and the image-side surface having the nanostructure layer has an average reflectance of R for light with wavelengths from 380 nm to 400 nm. 3840 It satisfies the following conditions: R 3840 ≤ 0.75%。 13. The imaging lens according to claim 6, characterized in that, The surface of at least one of the object-side and image-side surfaces having the nanostructure layer has an average reflectance of R for light with wavelengths from 400 nm to 700 nm. 4070 It satisfies the following conditions: R 4070 ≤ 0.5%。 14. The imaging lens according to claim 2, characterized in that, The thickness of the light-shielding sheet is T, and it satisfies the following conditions: 2 micrometers ≤ T ≤ 88 micrometers.

15. The imaging lens according to claim 2, characterized in that, The imaging lens also includes: A lens barrel for housing the light-shielding plate, and the lens barrel comprising: A cylindrical portion, surrounding the optical axis with the optical axis as its center; and A plate-shaped portion is connected to the cylindrical portion, wherein the plate-shaped portion extends toward the optical axis and forms an aperture, and the plate-shaped portion has: A supporting surface, in contact with the solid light-shielding sheet; and An inner wall surface extends from the aperture toward the supporting surface, wherein the inner wall surface and the light-shielding sheet are spaced apart by a distance in a direction parallel to the optical axis, and the distance gradually decreases in a direction away from the optical axis.

16. The imaging lens according to claim 15, characterized in that, The imaging lens comprises, sequentially along the optical axis: The light-shielding sheet; A first lens, housed within the lens barrel; and A second lens is housed within the lens barrel; Wherein, the maximum value of the interval distance is Dmax, and the thickness of the second lens along the optical axis is CT2, which satisfies the following conditions: 0.26 ≤ Dmax / CT2 ≤ 3.

2.

17. The imaging lens according to claim 16, characterized in that, The thickness of the second lens along the optical axis is CT2, which satisfies the following condition: 0.08 mm ≤ CT2 ≤ 0.82 mm.

18. The imaging lens according to claim 2, characterized in that, It also includes a lens group, wherein the lens group comprises a plurality of lenses, and at least one of the lenses is provided with the nanostructure layer.

19. An imaging lens, characterized in that, The imaging lens, passing through an optical axis, comprises: A light-blocking sheet, comprising: The side of an object is positioned perpendicularly to and around the optical axis; An image side is disposed opposite to the object side, and the image side is closer to the image side of the imaging lens than the object side; An inner annular surface connects the object side surface and the image side surface, and the inner annular surface surrounds the optical axis and defines a light-transmitting aperture; Multiple tapered light-blocking structures are disposed on the inner annular surface, wherein each tapered light-blocking structure protrudes from the inner annular surface and gradually tapers towards the optical axis. The tapered light-blocking structures are periodically arranged around the optical axis, and when viewed along the optical axis, the outline of each tapered light-blocking structure has at least one curved segment, and the at least one curved segment forms a curved surface on the inner annular surface; and A nanostructure layer is disposed on the curved surface formed by the at least one curved segment, and the nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the curved surface; The ridge-like protrusions are wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers. Wherein, when the center of the radius of curvature of the at least one curve segment is farther away from the optical axis than the at least one curve segment, the radius of curvature of the at least one curve segment is R. VC The radius of the light-transmitting aperture is R. L It satisfies the following conditions: 0.05 ≤ (R VC / R L )×1.02π 4 ≤ 34; Wherein, when the center of the radius of curvature of the at least one curve segment is closer to the optical axis than the at least one curve segment, the radius of curvature of the at least one curve segment is R. C The radius of the light-transmitting aperture is R. L It satisfies the following conditions: 0.11 ≤ (R C / R L )×1.02π 4 ≤ 49。 20. The imaging lens according to claim 19, characterized in that, The light-shielding sheet is made of plastic.

21. The imaging lens according to claim 19, characterized in that, The nanostructure layer further extends to at least one of the object side and the image side.

22. The imaging lens according to claim 21, characterized in that, The nanostructure layer further extends to one of the object side and the image side.

23. The imaging lens according to claim 19, characterized in that, The light-shielding sheet further includes a micrometer structure disposed on at least one of the object side and the image side, the micrometer structure having a plurality of protrusions, and the average height of the micrometer structure being greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers.

24. The imaging lens according to claim 20, characterized in that, The tapered light-blocking structure is integrally formed with the rest of the light-blocking sheet.

25. The imaging lens according to claim 24, characterized in that, The number of tapered light-blocking structures is N, and they satisfy the following condition: 39 ≤ N ≤ 147。 26. The imaging lens according to claim 21, characterized in that, The surface of at least one of the object-side and image-side surfaces having the nanostructure layer has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It satisfies the following conditions: R 7590 ≤ 0.65%。 27. The imaging lens according to claim 21, characterized in that, The surface of at least one of the object-side surface and the image-side surface having the nanostructure layer has an average reflectance of R for light with wavelengths from 380 nm to 400 nm. 3840 It satisfies the following conditions: R 3840 ≤ 0.75%。 28. The imaging lens according to claim 21, characterized in that, The surface of at least one of the object-side and image-side surfaces having the nanostructure layer has an average reflectance of R for light with wavelengths from 400 nm to 700 nm. 4070 It satisfies the following conditions: R 4070 ≤ 0.5%。 29. The imaging lens according to claim 19, characterized in that, The thickness of the light-shielding sheet is T, and it satisfies the following conditions: 2 micrometers ≤ T ≤ 88 micrometers.

30. The imaging lens according to claim 19, characterized in that, The imaging lens also includes: A lens barrel for housing the light-shielding plate, and the lens barrel comprising: A cylindrical portion, surrounding the optical axis with the optical axis as its center; and A plate-shaped portion is connected to the cylindrical portion, wherein the plate-shaped portion extends toward the optical axis and forms an aperture, and the plate-shaped portion has: A supporting surface, in contact with the solid light-shielding sheet; and An inner wall surface extends from the aperture toward the supporting surface, wherein the inner wall surface and the light-shielding sheet are spaced apart by a distance in a direction parallel to the optical axis, and the distance gradually decreases in a direction away from the optical axis.

31. The imaging lens according to claim 30, characterized in that, The imaging lens comprises, sequentially along the optical axis: The light-shielding sheet; A first lens, housed within the lens barrel; and A second lens is housed within the lens barrel; Wherein, the maximum value of the interval distance is Dmax, and the thickness of the second lens along the optical axis is CT2, which satisfies the following conditions: 0.26 ≤ Dmax / CT2 ≤ 3.

2.

32. The imaging lens according to claim 31, characterized in that, The thickness of the second lens along the optical axis is CT2, which satisfies the following condition: 0.08 mm ≤ CT2 ≤ 0.82 mm.

33. The imaging lens according to claim 19, characterized in that, It also includes a lens group, wherein the lens group comprises a plurality of lenses, and at least one of the lenses is provided with the nanostructure layer.

34. An imaging lens, characterized in that, The imaging lens, passing through an optical axis, comprises: A light-shielding element, comprising: The side of an object is positioned perpendicularly to and around the optical axis; An image side is disposed opposite to the object side, and the image side is closer to the image side of the imaging lens than the object side; An inner annular surface connects the object-side surface and the image-side surface, and the inner annular surface surrounds the optical axis and defines a light-passing aperture; and A nanostructure layer is disposed at least on the inner ring surface, wherein the nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the inner ring surface; The ridge-like protrusions are wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 98 nanometers and less than or equal to 350 nanometers.

35. The imaging lens according to claim 34, characterized in that, The light-shielding element is a light-shielding sheet.

36. The imaging lens according to claim 34, characterized in that, The light-shielding element is either a spacer element or a fixed element.

37. The imaging lens according to claim 35, characterized in that, The light-shielding sheet is made of plastic.

38. The imaging lens according to claim 37, characterized in that, The light-shielding sheet has a multi-layer structure, which includes: A base layer, wherein the base layer is made of plastic; and The second coating layer covers the base layer from both sides.

39. The imaging lens according to claim 34, characterized in that, The nanostructure layer is made of aluminum oxide (Al2O3).

40. The imaging lens according to claim 37, characterized in that, The light-shielding element further includes multiple tapered light-shielding structures disposed on the inner ring surface. The tapered light-shielding structures protrude from the inner ring surface and gradually taper towards the optical axis. The tapered light-shielding structures are periodically arranged around the optical axis. When viewed along the optical axis, the outline of each tapered light-shielding structure has a first curved segment and a second curved segment. The first curved segment and the second curved segment each form a curved surface on the inner ring surface, and the nanostructure layer is disposed on the curved surface formed by the first curved segment and the second curved segment.

41. The imaging lens according to claim 40, characterized in that, The center of the radius of curvature of the first curve segment is farther away from the optical axis than the first curve segment, and the radius of curvature of the first curve segment is R. VC It satisfies the following conditions: 0.005 mm ≤ R VC ≤ 0.37 mm.

42. The imaging lens according to claim 40, characterized in that, The center of the radius of curvature of the second curve segment is closer to the optical axis than the second curve segment itself, and the radius of curvature of the second curve segment is R. C It satisfies the following conditions: 0.008 mm ≤ R C ≤ 0.42 mm.

43. The imaging lens according to claim 40, characterized in that, The center of the radius of curvature of the first curve segment is farther away from the optical axis than the first curve segment, while the center of the radius of curvature of the second curve segment is closer to the optical axis than the second curve segment. The radius of curvature of the first curve segment is R. VC The radius of curvature of the second curve segment is R. C It satisfies the following conditions: 0.3 ≤ R C / R VC ≤ 35。 44. The imaging lens according to claim 37, characterized in that, The light-shielding element further includes a micrometer structure disposed on at least one of the object side and the image side, the micrometer structure having a plurality of protrusions, and the average height of the micrometer structure being greater than or equal to 0.25 micrometers and less than or equal to 19 micrometers.

45. The imaging lens according to claim 43, characterized in that, The number of tapered light-blocking structures is N, and they satisfy the following condition: 39 ≤ N ≤ 147。 46. ​​The imaging lens according to claim 37, characterized in that, The nanostructure layer further extends to at least one of the object side and the image side, and the surface of the object side or the image side on which the nanostructure layer is disposed has an average reflectance of R for light with wavelengths from 750 nm to 900 nm. 7590 It satisfies the following conditions: R 7590 ≤ 0.65%。 47. The imaging lens according to claim 37, characterized in that, The nanostructure layer further extends to at least one of the object side and the image side, and the surface of the object side or the image side on which the nanostructure layer is disposed has an average reflectance of R for light with a wavelength of 380 nm to 400 nm. 3840 It satisfies the following conditions: R 3840 ≤ 0.75%。 48. The imaging lens according to claim 37, characterized in that, The nanostructure layer further extends to at least one of the object side and the image side, and the surface of the object side or the image side on which the nanostructure layer is disposed has an average reflectance of R for light with a wavelength of 400 nm to 700 nm. 4070 It satisfies the following conditions: R 4070 ≤ 0.5%。 49. The imaging lens according to claim 37, characterized in that, The thickness of the light-shielding sheet is T, and it satisfies the following conditions: 2 micrometers ≤ T ≤ 88 micrometers.

50. The imaging lens according to claim 40, characterized in that, The imaging lens also includes: A lens barrel for housing the light-shielding element, and the lens barrel comprising: A cylindrical portion, surrounding the optical axis with the optical axis as its center; and A plate-shaped portion is connected to the cylindrical portion, wherein the plate-shaped portion extends toward the optical axis and forms an aperture, and the plate-shaped portion has: A supporting surface that contacts the solid light-shielding element; and An inner wall surface extends from the aperture toward the supporting surface, wherein the inner wall surface and the light-shielding element are spaced apart by a distance in a direction parallel to the optical axis, and the distance gradually decreases in a direction away from the optical axis.

51. The imaging lens according to claim 50, characterized in that, The imaging lens comprises, sequentially along the optical axis: The light-shielding element; A first lens, housed within the lens barrel; and A second lens is housed within the lens barrel; Wherein, the maximum value of the interval distance is Dmax, and the thickness of the second lens along the optical axis is CT2, which satisfies the following conditions: 0.26 ≤ Dmax / CT2 ≤ 3.

2.

52. The imaging lens according to claim 51, characterized in that, The thickness of the second lens along the optical axis is CT2, which satisfies the following condition: 0.08 mm ≤ CT2 ≤ 0.82 mm.

53. The imaging lens according to claim 40, characterized in that, It also includes a lens group, wherein the lens group comprises a plurality of lenses, and at least one of the lenses is provided with the nanostructure layer.

54. An electronic device, characterized in that, It includes an imaging lens according to claim 1, 15, 19, 30 or 34.

Images