Imaging lens, camera module and electronic device
Patent Information
- Application Number
- CN202211294404.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2022-03-24
- Filing Date
- 2022-10-21
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2042-10-21
Smart Images
Figure CN116840995B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to an imaging lens, camera module, and electronic device, and more particularly to a miniaturized imaging lens, camera module, and portable electronic device. Background Technology
[0002] In recent years, portable electronic devices have developed rapidly, such as smart electronic devices and tablet computers, which have become ubiquitous in modern life. Camera modules mounted on these portable electronic devices have also flourished. However, as technology advances, users have increasingly higher demands for the quality of electronic devices and their camera modules. Therefore, developing miniaturized imaging lenses, camera modules, and related electronic devices that also maintain high image quality has become an important and urgent problem for the industry. Summary of the Invention
[0003] This disclosure provides an imaging lens, a camera module, and an electronic device. At least one of the multiple optical elements in the imaging lens is a lens. The lens includes an effective optical portion, an outer peripheral portion, a light-shielding coating, and a nanostructure layer. The light-shielding coating is disposed on at least one of the object-side and image-side outer peripheral surfaces and includes a tapered portion that tapers towards the center of the effective optical portion, and the tapered portion tapers near the junction of the effective optical portion and the outer peripheral portion. The nanostructure layer is disposed on the effective optical portion and the tapered portion of the light-shielding coating. The nanostructure layer has multiple irregular ridge-like protrusions, and the tapered portion of the light-shielding coating forms a light-transmitting aperture along the direction surrounding the optical axis near the junction. This improves image quality.
[0004] According to one embodiment of this disclosure, an imaging lens is provided, comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens includes an effective optical portion, an outer peripheral portion, a light-shielding coating, a nanostructure layer, and a connecting structure layer. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens. The image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens. The image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side and image-side outer peripheral surfaces and includes a tapered portion. The tapered portion tapers towards the center of the optically effective part and is located near the junction of the optically effective part and the outer peripheral part. A nanostructure layer is disposed on the optically effective part and the tapered portion of the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. A connecting structure layer is disposed between the nanostructure layer and the optically effective part, and between the nanostructure layer and the outer peripheral part. The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. A light-transmitting hole is formed near the junction of the tapered portion of the light-shielding coating along the direction surrounding the optical axis. The roundness tolerance value of the light-transmitting hole is t, which satisfies the following condition: t < 0.02 mm.
[0005] According to the imaging lens of the aforementioned embodiment, both the object-side optical effective surface and the image-side optical effective surface of the optical effective portion can be smooth surfaces, and at least one of the object-side outer peripheral surface and the image-side outer peripheral surface in which the light-shielding coating is disposed can be a smooth surface.
[0006] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 90 nm and 350 nm.
[0007] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 125 nm and 300 nm.
[0008] The imaging lens according to the aforementioned embodiment has an average height of the nanostructure layer that can be between 195 nm and 255 nm.
[0009] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.01 mm.
[0010] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.005 mm.
[0011] In the imaging lens according to the aforementioned embodiment, the light-shielding coating may be further disposed on the outer diameter surface.
[0012] According to the imaging lens of the aforementioned embodiment, the light-shielding coating may be disposed on the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface.
[0013] According to the imaging lens of the aforementioned embodiment, the lens may further include at least one axial connection structure for connecting to another adjacent optical element and aligning the optical axis with the other adjacent optical element.
[0014] According to the imaging lens of the aforementioned embodiment, the light-shielding coating may extend from the outer diameter surface to at least one axial connection structure.
[0015] According to another embodiment of this disclosure, a camera module is provided, which includes the aforementioned imaging lens.
[0016] According to a further embodiment of the present disclosure, an electronic device is provided, comprising the aforementioned camera module, wherein the camera module further comprises an electronic photosensitive element, and the electronic photosensitive element is disposed on the imaging surface of the camera module.
[0017] According to another embodiment of this disclosure, an imaging lens is provided, comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens includes an effective optical portion, an outer peripheral portion, a light-shielding coating, a nanostructure layer, at least one axial connecting structure, and a connecting structure layer. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens. The image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens. The image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side and image-side outer peripheral surfaces and includes a tapered portion. The tapered portion tapers towards the center of the optically effective part and is located near the junction of the optically effective part and the outer peripheral part. A nanostructure layer is disposed on the optically effective part and the tapered portion of the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. A connecting structure layer is disposed between the nanostructure layer and the optically effective part, and between the nanostructure layer and the outer peripheral part. The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. The lens barrel includes an axial alignment structure, which connects to at least one axial connecting structure to align the lens with the optical axis. A light-transmitting aperture is formed near the junction of the tapered portion of the light-shielding coating along the direction surrounding the optical axis. The roundness tolerance of the light-transmitting aperture is t, which satisfies the following condition: t < 0.02 mm.
[0018] According to the imaging lens of the aforementioned embodiment, both the object-side optical effective surface and the image-side optical effective surface of the optical effective portion can be smooth surfaces, and at least one of the object-side outer peripheral surface and the image-side outer peripheral surface in which the light-shielding coating is disposed can be a smooth surface.
[0019] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 90 nm and 350 nm.
[0020] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 125 nm and 300 nm.
[0021] The imaging lens according to the aforementioned embodiment has an average height of the nanostructure layer that can be between 195 nm and 255 nm.
[0022] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.01 mm.
[0023] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.005 mm.
[0024] The imaging lens according to the aforementioned embodiment may be a glass lens.
[0025] In the imaging lens according to the aforementioned embodiment, the light-shielding coating may be further disposed on the outer diameter surface.
[0026] According to the imaging lens of the aforementioned embodiment, the light-shielding coating may be disposed on the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface.
[0027] The imaging lens according to the foregoing embodiment, wherein the light-shielding coating may extend from the outer diameter surface to at least one axial connection structure.
[0028] According to another embodiment of this disclosure, an imaging lens is provided, comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens includes an effective optical portion, an outer peripheral portion, a light-shielding coating, a nanostructure layer, and a connecting structure layer. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens. The image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens. The image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side and image-side outer peripheral surfaces and includes a tapered portion. The tapered portion tapers towards the center of the optically effective portion and is located near the junction of the optically effective portion and the outer peripheral portion. A nanostructure layer is disposed on the optically effective portion and the tapered portion of the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. A connecting structure layer is disposed between the nanostructure layer and the optically effective portion, and also between the nanostructure layer and the outer peripheral portion. The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. A light-transmitting hole is formed in the tapered portion of the light-shielding coating near the junction along the direction surrounding the optical axis.
[0029] According to the imaging lens of the aforementioned embodiment, both the object-side optical effective surface and the image-side optical effective surface of the optical effective portion can be smooth surfaces, and at least one of the object-side outer peripheral surface and the image-side outer peripheral surface in which the light-shielding coating is disposed can be a smooth surface.
[0030] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 90 nm and 350 nm.
[0031] In the imaging lens according to the aforementioned embodiments, the average height of the nanostructure layer can be between 125 nm and 300 nm.
[0032] The imaging lens according to the aforementioned embodiment has an average height of the nanostructure layer that can be between 195 nm and 255 nm.
[0033] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.02 mm.
[0034] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.01 mm.
[0035] According to the imaging lens of the aforementioned embodiment, the roundness tolerance value of the light-transmitting aperture is t, which can satisfy the following condition: t < 0.005 mm.
[0036] The imaging lens according to the aforementioned embodiment, wherein the nanostructure layer is a metal oxide structure layer.
[0037] The imaging lens according to the aforementioned embodiment, wherein the connecting structure layer is a non-metallic oxide structure layer. Attached Figure Description
[0038] Figure 1A A schematic diagram of a camera module according to a first embodiment of the present disclosure is shown;
[0039] Figure 1B Draw Figure 1A A close-up 1B view of a portion of the camera module;
[0040] Figure 1C Draw Figure 1B A magnified 1C view of a portion of the camera module;
[0041] Figure 1D Draw Figure 1B A magnified 1D view of a portion of the camera module;
[0042] Figure 1E Draw Figure 1B A magnified 1E view of a portion of the camera module;
[0043] Figure 1F Draw Figure 1A A magnified view of a portion of the central camera module (1F).
[0044] Figure 1G Draw Figure 1F A 1G magnified view of a portion of the camera module;
[0045] Figure 1H Draw Figure 1FA magnified 1H view of a portion of the camera module;
[0046] Figure 1I Draw Figure 1F A magnified 1I view of a portion of the camera module;
[0047] Figure 1J Draw Figure 1A A schematic diagram of the first lens of the camera module;
[0048] Figure 1K Draw Figure 1A A three-dimensional cross-sectional view of the first lens of the camera module;
[0049] Figure 1L Draw Figure 1A A schematic diagram of the second lens of the camera module;
[0050] Figure 1M Draw Figure 1A A three-dimensional cross-sectional view of the second lens of the camera module;
[0051] Figure 1N Draw Figure 1A A schematic diagram of the third lens in the camera module;
[0052] Figure 10 Draw Figure 1A A three-dimensional cross-sectional view of the third lens of the camera module;
[0053] Figure 1P Draw Figure 1A Images of the nanostructured layers of the camera module as observed by an electron microscope;
[0054] Figure 1Q Draw Figure 1A Another image of the nanostructured layer of the camera module as observed by an electron microscope;
[0055] Figure 1R Draw Figure 1A Images of cross-sections of the nanostructure layer, connecting structure layer, and optical effective part of the camera module observed using an electron microscope;
[0056] Figure 1S Draw Figure 1A Another image observed with an electron microscope shows a cross-section of the nanostructure layer, the connecting structure layer, and the optical effective part of the camera module.
[0057] Figure 1T Draw Figure 1A A cross-section of the nanostructure layer, connecting structure layer, and optical effective part of the camera module is observed using an electron microscope, providing a more comprehensive image.
[0058] Figure 2A A schematic diagram of a camera module according to a second embodiment of this disclosure is shown;
[0059] Figure 2B Draw Figure 2A A 2B magnified view of a portion of the camera module;
[0060] Figure 2C Draw Figure 2B A magnified 2C view of a portion of the camera module;
[0061] Figure 2D Draw Figure 2B A magnified 2D view of a portion of the camera module;
[0062] Figure 2E Draw Figure 2B A partial 2E magnified view of the central camera module;
[0063] Figure 2F Draw Figure 2A A schematic diagram of the first lens of the camera module;
[0064] Figure 2G Draw Figure 2A A three-dimensional cross-sectional view of the first lens of the camera module;
[0065] Figure 3A A schematic diagram illustrating an electronic device according to a third embodiment of this disclosure; and
[0066] Figure 3B Draw Figure 3A Block diagram of an electronic device.
[0067] [Symbol Explanation]
[0068] 100, 500, 700: Camera modules
[0069] 110, 510, 710: Imaging lens
[0070] 120,520: Lens tube
[0071] 137, 138: Light-blocking sheet
[0072] 148,548: Filter element
[0073] 150, 550: Imaging plane
[0074] 160, 560, 760: Electronic photosensitive element
[0075] 200, 600: First lens
[0076] 230, 330, 430, 630: Effective optical section
[0077] 231, 331, 431, 631: Effective optical surface on the object side
[0078] 232, 332, 432, 632: Image-side optical effective surface
[0079] 240,340,440,640: Peripheral part
[0080] 241,341,441,641: Outer peripheral surface of the object side
[0081] 242,342,442,642: Image-side outer peripheral surface
[0082] 243,343,443,643: Outer diameter surface
[0083] 245, 345, 445, 645: Boundary
[0084] 250, 350, 450, 650: Light-shielding coating
[0085] 250a, 350a, 450a, 650a: Range of light-shielding coatings
[0086] 254, 354, 454, 654: tapering portion
[0087] 257, 357, 457, 657: Light-transmitting apertures
[0088] 257b, 357b, 457b, 657b: Ideal aperture shapes
[0089] 270, 370, 470, 670: Nanostructure layers
[0090] 270a, 370a, 470a, 670a: Range of nanostructure layers
[0091] 276,376,476,676: Irregular ridge-like protrusions
[0092] 280, 380, 680: Axial connection structure
[0093] 300,537: Second lens
[0094] 360, 460, 660: Connecting structural layers
[0095] 400: Third lens
[0096] 521: Axial alignment structure
[0097] 70: Electronic devices
[0098] 71: Outer shell
[0099] 72: Lens cover plate
[0100] 73: Interior Space
[0101] 74: Imaging signal processing element
[0102] 75: User Interface
[0103] 76: Sensing element
[0104] 77: Flash module
[0105] 78: Focusing Assist Module
[0106] 790: Optical anti-shake component
[0107] No. 1: Height of the connecting structural layer
[0108] No. 2: Maximum height of the nanostructure layer
[0109] t: Roundness tolerance value
[0110] t1: Upper limit of roundness
[0111] t2: Lower limit of roundness
[0112] z: Optical axis Detailed Implementation
[0113] One embodiment of this disclosure provides an imaging lens comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens comprises an effective optical portion, an outer peripheral portion, a light-shielding coating, and a nanostructure layer. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens, and the image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens, and the image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes a tapered portion. The tapered portion tapers towards the center of the optically active part, and the tapering portion is located near the junction of the optically active part and the outer periphery. A nanostructure layer is disposed on the tapered portion of the optically active part and the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. A light-transmitting hole is formed near the junction of the tapered portion of the light-shielding coating along the direction surrounding the optical axis, and the roundness tolerance value of the light-transmitting hole is t, which satisfies the following condition: t < 0.02 mm. Therefore, the above embodiment is an anti-reflection countermeasure where a light-shielding coating is added to the lens surface and then a nanostructure layer is applied. The nanostructure layer is disposed on the tapered portion of the light-shielding coating, which can reduce the reflection of light at the light-transmitting hole of the tapered portion, thereby improving image quality.
[0114] Furthermore, the light-shielding coating can be a black ink spraying layer formed from a quick-drying ink based on epoxy resin, a blackened coating layer formed by chemical vapor deposition, or a photoresistive coating layer, etc., but is not limited to these. When viewed in cross-section, the irregular ridge-like protrusions, resembling a mountain ridge, are wider at the bottom and narrower at the top. This allows the equivalent refractive index of the nanostructure layer to decrease from bottom to top, thus disrupting reflected light and reducing its generation. The light-transmitting aperture formed by the light-shielding coating has a measurable sphericity, indicating that the precision of the light-shielding coating application technology is controllable. The boundary between the optical active part and the outer periphery is a ridge line that can be clearly identified with the naked eye, but is not limited to this. The boundary can also exhibit a convex step appearance, formed by the extension of the respective surfaces of the optical active part and the outer periphery intersecting each other, and having a ridge line at the intersection, but is not limited to this. The term "near the boundary" refers to the area within + / - 0.03 mm of the boundary edge.
[0115] In detail, all surfaces of the optical effective part can be smooth surfaces, and the surface on the outer periphery where the light-shielding coating is disposed can also be a smooth surface. This improves the flowability of the light-shielding coating when applied to the surfaces of the outer periphery, allowing for precise control of the light-shielding position of the coating and the roundness of the light-transmitting aperture. A smooth surface is defined as a surface with a surface roughness Ra < 0.1 μm (micrometer).
[0116] The average height of the nanostructure layer can be between 90 nm and 350 nm, which is a height setting range for the nanostructure layer that does not affect imaging quality while also achieving good anti-reflection effects. Furthermore, the average height of the nanostructure layer can be between 125 nm and 300 nm, which is a height setting range for the nanostructure layer that does not affect imaging quality while also achieving good anti-reflection effects. Additionally, the average height of the nanostructure layer can be between 195 nm and 255 nm. The nanostructure layer is made of alumina (Al₂O₃). When the average height of the nanostructure layer is close to 200 nm, it has a better anti-reflection effect for incident light under certain conditions, but this is not a limitation.
[0117] The roundness tolerance of the light-transmitting aperture is t, which satisfies the following condition: t < 0.01 mm. This allows the light-shielding coating to replace the light-shielding performance of traditional light-shielding sheets. Furthermore, it satisfies the following condition: t < 0.005 mm. This allows for more precise light-shielding position requirements.
[0118] The lens may further include a connecting structure layer, which is disposed between the nanostructure layer and the optical effective part, and also between the nanostructure layer and the outer peripheral part. This connecting structure layer ensures a tight bond between the lens and the nanostructure layer, resulting in high structural stability. The nanostructure layer can also be considered as being disposed on the top layer of the connecting structure layer, for example... Figure 1R , Figure 1S , Figure 1T The cross-section (i.e., transverse section) of the lens observed under an electron microscope shows, from top to bottom, a nanostructure layer, a connecting structure layer, and the optically effective part. The connecting structure layer can also be composed of multiple films with different refractive indices stacked alternately, and it includes at least one silicon dioxide (SiO2) film layer. The surface of the nanostructure layer has multiple porous structures, for example... Figure 1P , Figure 1Q The image shows the distribution of the nanostructure layer on the lens as observed from above using an electron microscope. The surface of the nanostructure layer has multiple pore structures, and the exposed connecting structure layer is in contact with the air.
[0119] The light-shielding coating can be applied to the outer diameter surface. This extends the light-shielding range of the coating, ensuring effective shielding of non-imaging light from the outer diameter surface.
[0120] The light-shielding coating can be applied to the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface. This extends the light-shielding range of the coating, allowing it to replace adjacent optical elements with the same function (such as light-shielding sheets), thereby reducing production costs. The light-shielding coating can be applied to the entire outer peripheral surface, which provides better light-shielding performance, but is not a limitation.
[0121] The lens may further include at least one axial connection structure for connecting to an adjacent optical element and aligning with the optical axis of the adjacent optical element. The two adjacent optical elements (i.e., the lens and the other optical element) are interlocked and assembled to achieve alignment and improve the resolution of the imaging lens.
[0122] The light-shielding coating can extend from the outer diameter surface to the at least one axial connection structure. This satisfies the light-shielding requirements at the location of the axial connection structure, thereby improving image quality.
[0123] Another embodiment of this disclosure provides a camera module including the aforementioned imaging lens.
[0124] A further embodiment of this disclosure provides an electronic device including the aforementioned camera module, wherein the camera module further includes an electronic photosensitive element, and the electronic photosensitive element is disposed on the imaging surface of the camera module (i.e., the imaging surface of the imaging lens).
[0125] Another embodiment of this disclosure provides an imaging lens comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens comprises an effective optical portion, an outer peripheral portion, a light-shielding coating, a nanostructure layer, and at least one axial connecting structure. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens, and the image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens, and the image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes a tapered portion. The tapered portion tapers towards the center of the optically active part, and the tapering portion tapers near the junction of the optically active part and the outer peripheral part. A nanostructure layer is disposed on the tapered portion of the optically active part and the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. The lens barrel includes an axial alignment structure that connects to the at least one axial connection structure, so that the lens is aligned with the optical axis. A light-transmitting aperture is formed near the junction of the tapered portion of the light-shielding coating along the direction surrounding the optical axis, and the roundness tolerance value of the light-transmitting aperture is t, which satisfies the following condition: t < 0.02 mm.
[0126] In detail, all surfaces of the optical effective part can be smooth surfaces, and the surface on the outer periphery where the light-shielding coating is disposed can also be a smooth surface. This improves the flowability of the light-shielding coating when it is applied to the surfaces of the outer periphery, and allows for precise control of the light-shielding position of the coating and the roundness of the light-transmitting aperture.
[0127] The average height of the nanostructure layer can range from 90 nm to 350 nm. Alternatively, the average height can range from 125 nm to 300 nm. Furthermore, the average height can range from 195 nm to 255 nm. These are all height settings for the nanostructure layer that do not affect imaging quality while also providing good anti-reflective properties.
[0128] The roundness tolerance of the light-transmitting aperture is t, which satisfies the following condition: t < 0.01 mm. This allows the light-shielding coating to replace the light-shielding performance of traditional light-shielding sheets. Furthermore, it satisfies the following condition: t < 0.005 mm. This allows for more precise light-shielding position requirements.
[0129] The lens can be a glass lens. This makes it less susceptible to changes in ambient temperature, thereby maintaining stable optical quality.
[0130] The lens may further include a connecting structure layer disposed between the nanostructure layer and the optical effective part, and also disposed between the nanostructure layer and the outer peripheral part. In this way, the connecting structure layer ensures a tight bond between the lens and the nanostructure layer, resulting in high structural stability.
[0131] The light-shielding coating can be applied to the outer diameter surface. This extends the light-shielding range of the coating, ensuring effective shielding of non-imaging light from the outer diameter surface.
[0132] The light-shielding coating can be applied to the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface. This extends the light-shielding range of the coating, allowing it to replace other adjacent optical elements with the same function, thereby reducing production costs.
[0133] The light-shielding coating can extend from the outer diameter surface to the at least one axial connection structure. This satisfies the light-shielding requirements at the location of the axial connection structure, thereby improving image quality.
[0134] Another embodiment of this disclosure provides an imaging lens comprising a plurality of optical elements and a lens barrel. An optical axis passes through the optical elements, at least one of which is a lens. The lens barrel houses the optical elements. The lens comprises an effective optical portion, an outer peripheral portion, a light-shielding coating, and a nanostructure layer. The optical axis passes through the effective optical portion, which includes an object-side effective optical surface and an image-side effective optical surface. The object-side effective optical surface faces the object side of the imaging lens, and the image-side effective optical surface faces the image side of the imaging lens and is disposed opposite to the object-side effective optical surface. The outer peripheral portion surrounds the effective optical portion and includes an object-side outer peripheral surface, an image-side outer peripheral surface, and an outer diameter surface. The object-side outer peripheral surface faces the object side of the imaging lens, and the image-side outer peripheral surface faces the image side of the imaging lens and is disposed opposite to the object-side outer peripheral surface. The outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface. A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes a tapered portion. The tapering portion tapers towards the center of the optically active part, and the tapering portion tapers near the junction of the optically active part and the outer peripheral part. A nanostructure layer is disposed on the tapering portion of the optically active part and the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. A light-transmitting hole is formed in the tapering portion of the light-shielding coating near the junction along the direction surrounding the optical axis.
[0135] In detail, all surfaces of the optical effective part can be smooth surfaces, and the surface on the outer periphery where the light-shielding coating is disposed can also be a smooth surface. This improves the flowability of the light-shielding coating when it is applied to the surfaces of the outer periphery, and allows for precise control of the light-shielding position of the coating and the roundness of the light-transmitting aperture.
[0136] The average height of the nanostructure layer can range from 90 nm to 350 nm. Alternatively, the average height can range from 125 nm to 300 nm. Furthermore, the average height can range from 195 nm to 255 nm. These are all height settings for the nanostructure layer that do not affect imaging quality while also providing good anti-reflective properties.
[0137] The roundness tolerance value of the light-transmitting aperture is t, which satisfies the following condition: t < 0.02 mm. This allows the light-shielding coating to replace the light-shielding performance of traditional light-shielding sheets. Furthermore, it satisfies the following condition: t < 0.01 mm. This allows the light-shielding coating to replace the light-shielding performance of traditional light-shielding sheets. Additionally, it satisfies the following condition: t < 0.005 mm. This allows for more precise light-shielding position requirements.
[0138] The lens may further include a connecting structure layer disposed between the nanostructure layer and the optical effective part, and also disposed between the nanostructure layer and the outer peripheral part. In this way, the connecting structure layer ensures a tight bond between the lens and the nanostructure layer, resulting in high structural stability.
[0139] The nanostructure layer may contain metal oxides, which are selected for their superior anti-reflective properties.
[0140] The material of the connecting structural layer may include non-metallic oxides, and the material properties selected are for better structural stability.
[0141] It should be noted that the same or similar technical features in the above embodiments can achieve the same or similar technical effects, so they will not be repeated. Based on the above embodiments, specific examples are presented below and described in detail with reference to the accompanying drawings.
[0142] <First Embodiment>
[0143] Figure 1A A schematic diagram (also a cross-sectional view) of the camera module 100 according to the first embodiment of this disclosure is shown below. Figure 1A The camera module 100 includes an imaging lens 110, a filter element 148, and an electronic image sensor 160. The filter element 148 is disposed between the imaging lens 110 and the imaging surface 150 of the camera module 100 (i.e., the imaging surface 150 of the imaging lens 110), and the electronic image sensor 160 is disposed on the imaging surface 150 of the camera module 100. The imaging lens 110 includes multiple optical elements (such as a first lens 200, a second lens 300, a third lens 400, light shields 137 and 138, spacers, retaining rings, etc.) and a lens barrel 120. Figure 1AThe complete structure of some optical elements is not shown in the figure. The lens barrel 120 houses the optical elements, and the optical axis z passes through the optical elements. The three optical elements are the first lens 200, the second lens 300, and the third lens 400.
[0144] Figure 1B Draw Figure 1A A close-up 1B view of a portion of the camera module 100. Figure 1C Draw Figure 1B A magnified 1C view of a portion of the camera module 100. Figure 1D Draw Figure 1B A partial 1D magnified image of the camera module 100. Figure 1E Draw Figure 1B A partial 1E magnified view of the camera module 100. Figure 1F Draw Figure 1A A magnified view of a portion of the camera module 100 (1F). Figure 1G Draw Figure 1F A 1G magnified image of a portion of the camera module 100. Figure 1H Draw Figure 1F A magnified 1H view of a portion of the camera module 100. Figure 1I Draw Figure 1F A magnified view of a portion of the camera module 100. Figure 1J Draw Figure 1A A schematic diagram of the first lens 200 of the camera module 100 (also a diagram showing the relationship between a cross-sectional view and an image side view). Figure 1K Draw Figure 1A A three-dimensional cross-sectional view of the first lens 200 of the camera module 100. Please refer to... Figures 1A to 1K The first lens 200 of the imaging lens 110 of the camera module 100 includes an optical effective part 230, an outer peripheral part 240, a light-shielding coating 250, and a nanostructure layer 270.
[0145] Please refer to Figure 1A The optical axis z passes through the optically effective portion 230 of the first lens 200. The optically effective portion 230 includes an object-side optically effective surface 231 and an image-side optically effective surface 232. The object-side optically effective surface 231 faces the object side of the imaging lens 110 (i.e., the image side). Figure 1A The left side of the image lens 110 (i.e., the image-side effective optical surface 232 faces the image side of the imaging lens 110). Figure 1A The outer peripheral portion 240 of the first lens 200 surrounds the optically effective portion 230 and includes an object-side outer peripheral surface 241, an image-side outer peripheral surface 242, and an outer diameter surface 243. The object-side outer peripheral surface 241 faces the object side of the imaging lens 110, the image-side outer peripheral surface 242 faces the image side of the imaging lens 110 and is disposed opposite to the object-side outer peripheral surface 241, and the outer diameter surface 243 connects the object-side outer peripheral surface 241 and the image-side outer peripheral surface 242.
[0146] Please refer to Figures 1B to 1D , Figure 1J and Figure 1K The light-shielding coating 250 of the first lens 200 is disposed on at least one of the object-side outer peripheral surface 241 and the image-side outer peripheral surface 242 and includes a tapered portion 254. The tapered portion 254 tapers toward the center of the optical effective portion 230 and tapers to the vicinity of the junction 245 between the optical effective portion 230 and the outer peripheral portion 240. Specifically, the light-shielding coating 250 is disposed on the object-side outer peripheral surface 241 and the image-side outer peripheral surface 242. Two tapered portions 254 are respectively disposed on the object-side outer peripheral surface 241 and the image-side outer peripheral surface 242 and tapered toward the center of the optical effective portion 230. The tapered portion 254 disposed on the object-side outer peripheral surface 241 tapered to near the junction 245 of the object-side optical effective surface 231 and the object-side outer peripheral surface 241. The tapered portion 254 disposed on the image-side outer peripheral surface 242 tapered to near the junction 245 of the image-side optical effective surface 232 and the image-side outer peripheral surface 242.
[0147] The nanostructure layer 270 of the first lens 200 is disposed on the optical effective portion 230 and the tapered portion 254 of the light-shielding coating 250. The nanostructure layer 270 has multiple irregular ridge-like protrusions 276. The tapered portion 254 of the light-shielding coating 250 forms a light-transmitting hole 257 along the z-direction surrounding the optical axis near the junction 245. Specifically, one of the two nanostructure layers 270 is disposed on the tapered portion 254 of the light-shielding coating 250 on the object-side optical effective surface 231 and the object-side outer peripheral surface 241. The tapered portion 254 forms a light-transmitting hole 257 along the z-direction surrounding the optical axis near the corresponding junction 245. The other of the two nanostructure layers 270 is disposed on the tapered portion 254 of the light-shielding coating 250 on the image-side optical effective surface 232 and the image-side outer peripheral surface 242. The tapered portion 254 forms another light-transmitting hole 257 along the z-direction surrounding the optical axis near the corresponding junction 245 (e.g., ...). Figure 1J As shown in the enlarged views at the upper right and lower right, the light-transmitting aperture 257 is slightly closer to the optical axis z than the corresponding boundary 245.
[0148] For details, please refer to Figure 1J The roundness tolerance value of aperture 257 is t, which satisfies the following condition: t < 0.02 mm. Furthermore, it satisfies the following condition: t < 0.01 mm. Moreover, it satisfies the following condition: t < 0.005 mm. For example... Figure 1J As shown in the enlarged view in the lower right corner, the light-transmitting hole 257 is an ideal light-transmitting hole shape 257b that is not actually a perfect circle, and the roundness tolerance value t of the light-transmitting hole 257 is defined based on the difference between the upper limit of roundness t1 and the lower limit of roundness t2.
[0149] The first lens 200 may be a glass lens. The object-side optical effective surface 231 and the image-side optical effective surface 232 of the optical effective part 230 may both be smooth surfaces. The object-side outer peripheral surface 241 and the image-side outer peripheral surface 242 may both be provided with a light-shielding coating 250 and may both be smooth surfaces.
[0150] Please refer to Figure 1J , Figure 1J The light-shielding coating range 250a in the leftmost figure represents the range of the light-shielding coating 250 but not its height. The light-shielding coating 250 is further disposed on the outer diameter surface 243, that is, the light-shielding coating 250 is disposed on the object-side outer peripheral surface 241, the image-side outer peripheral surface 242, and the outer diameter surface 243. Specifically, the light-shielding coating 250 essentially coats the entire surface of the outer peripheral portion 240.
[0151] Please refer to Figure 1B and Figure 1J The first lens 200 further includes an axial connecting structure 280 disposed on the image-side outer peripheral surface 242. The axial connecting structure 280 is used to connect adjacent second lenses 300. Specifically, the axial connecting structure 280 indirectly connects adjacent second lenses 300. The axial connecting structure 280 and the adjacent second lenses 300 are aligned with the optical axis z. Adjacent first lenses 200 and second lenses 300 are interlocked and assembled. Furthermore, the light-shielding coating 250 of the first lens 200 extends from the outer diameter surface 243 to the axial connecting structure 280.
[0152] Please refer to Figure 1C , Figure 1D , Figure 1J and Figure 1K ,in Figure 1J The leftmost diagram shows the range 270a of the nanostructure layer, which represents the range of the nanostructure layer 270 but not its height. The average height of the nanostructure layer 270 can be between 90 nm and 350 nm. Furthermore, the average height of the nanostructure layer 270 can be between 125 nm and 300 nm. Additionally, the average height of the nanostructure layer 270 can be between 195 nm and 255 nm. Moreover, the material of the nanostructure layer 270 can include metal oxides.
[0153] Figure 1L Draw Figure 1A A schematic diagram of the second lens 300 of the camera module 100 (also a diagram showing the relationship between the cross-sectional view and the image side view). Figure 1M Draw Figure 1A A three-dimensional cross-sectional view of the second lens 300 of the camera module 100. Please refer to... Figure 1B , Figure 1D , Figure 1E , Figure 1L and Figure 1MThe second lens 300 of the imaging lens 110 of the camera module 100 includes an optical effective part 330, an outer peripheral part 340, a light-shielding coating 350, and a nanostructure layer 370.
[0154] Please refer to Figure 1A The optical axis z passes through the optically effective portion 330 of the second lens 300. The optically effective portion 330 includes an object-side optically effective surface 331 and an image-side optically effective surface 332. The object-side optically effective surface 331 faces the object side of the imaging lens 110, and the image-side optically effective surface 332 faces the image side of the imaging lens 110 and is disposed opposite to the object-side optically effective surface 331. The outer peripheral portion 340 of the second lens 300 surrounds the optically effective portion 330 and includes an object-side outer peripheral surface 341, an image-side outer peripheral surface 342, and an outer diameter surface 343. The object-side outer peripheral surface 341 faces the object side of the imaging lens 110, the image-side outer peripheral surface 342 faces the image side of the imaging lens 110 and is disposed opposite to the object-side outer peripheral surface 341, and the outer diameter surface 343 connects the object-side outer peripheral surface 341 and the image-side outer peripheral surface 342.
[0155] Please refer to Figure 1B , Figure 1D , Figure 1E , Figure 1L and Figure 1M The light-shielding coating 350 of the second lens 300 is disposed on at least one of the object-side outer peripheral surface 341 and the image-side outer peripheral surface 342 and includes a tapered portion 354. The tapered portion 354 tapers toward the center of the optically effective portion 330 and tapers to the vicinity of the junction 345 between the optically effective portion 330 and the outer peripheral portion 340. Specifically, the light-shielding coating 350 is disposed on the object-side outer peripheral surface 341 and the image-side outer peripheral surface 342. Two tapered portions 354 are respectively disposed on the object-side outer peripheral surface 341 and the image-side outer peripheral surface 342 and tapered toward the center of the optical effective portion 330. The tapered portion 354 disposed on the object-side outer peripheral surface 341 tapered to near the junction 345 of the object-side optical effective surface 331 and the object-side outer peripheral surface 341. The tapered portion 354 disposed on the image-side outer peripheral surface 342 tapered to near the junction 345 of the image-side optical effective surface 332 and the image-side outer peripheral surface 342.
[0156] The nanostructure layer 370 of the second lens 300 is disposed on the optical effective portion 330 and the tapered portion 354 of the light-shielding coating 350. The nanostructure layer 370 has multiple irregular ridge-like protrusions 376. The tapered portion 354 of the light-shielding coating 350 forms a light-transmitting hole 357 along the z-direction surrounding the optical axis near the junction 345. Specifically, one of the two nanostructure layers 370 is disposed on the tapered portion 354 of the light-shielding coating 350 on the object-side optical effective surface 331 and the object-side outer peripheral surface 341. The tapered portion 354 forms a light-transmitting hole 357 along the z-direction surrounding the optical axis near the corresponding junction 345. The other of the two nanostructure layers 370 is disposed on the tapered portion 354 of the light-shielding coating 350 on the image-side optical effective surface 332 and the image-side outer peripheral surface 342. The tapered portion 354 forms another light-transmitting hole 357 along the z-direction surrounding the optical axis near the corresponding junction 345 (e.g., ...). Figure 1L As shown in the enlarged view at the top right, the position of the light-transmitting aperture 357 and the corresponding junction 345 are very close.
[0157] For details, please refer to Figure 1L The roundness tolerance value of aperture 357 is t, which satisfies the following condition: t < 0.02 mm. Furthermore, it satisfies the following condition: t < 0.01 mm. Moreover, it satisfies the following condition: t < 0.005 mm. For example... Figure 1L As shown in the enlarged view at the top right, the light-transmitting hole 357 is an ideal light-transmitting hole shape 357b that is not actually a perfect circle, and the roundness tolerance value t of the light-transmitting hole 357 is defined based on the difference between the upper limit of roundness t1 and the lower limit of roundness t2.
[0158] The second lens 300 may be a glass lens. The object-side optical effective surface 331 and the image-side optical effective surface 332 of the optical effective part 330 may both be smooth surfaces. The object-side outer peripheral surface 341 and the image-side outer peripheral surface 342 may both be provided with a light-shielding coating 350 and may both be smooth surfaces.
[0159] Please refer to Figure 1L , Figure 1L The light-shielding coating range 350a in the leftmost figure represents the range of the light-shielding coating 350 but not its height. The light-shielding coating 350 is further disposed on the outer diameter surface 343, that is, the light-shielding coating 350 is disposed on the object-side outer peripheral surface 341, the image-side outer peripheral surface 342, and the outer diameter surface 343. Specifically, the light-shielding coating 350 essentially coats the entire surface of the outer peripheral portion 340.
[0160] Please refer to Figure 1B and Figure 1LThe second lens 300 further includes an axial connecting structure 380 disposed on the object-side outer peripheral surface 341. The axial connecting structure 380 is used to connect the axial connecting structure 280 of the adjacent first lens 200. Specifically, the axial connecting structure 380 is indirectly connected to the axial connecting structure 280 through a light-shielding coating 350, a connecting structure layer 360, nanostructure layers 370 and 270, and a light-shielding coating 250. The axial connecting structure 380 and the axial connecting structure 280 of the adjacent first lens 200 are aligned with the optical axis z. The adjacent first lenses 200 and second lenses 300 are interlocked and assembled. Furthermore, the light-shielding coating 350 of the second lens 300 extends from the outer diameter surface 343 to the axial connecting structure 380.
[0161] Please refer to Figure 1D , Figure 1E and Figure 1M The second lens 300 further includes a connecting structure layer 360, which is disposed between the nanostructure layer 370 and the optically effective portion 330, and also between the nanostructure layer 370 and the outer peripheral portion 340. Specifically, the second lens 300 further includes two connecting structure layers 360. One of the two connecting structure layers 360 is disposed between the corresponding nanostructure layer 370 and the object-side optically effective surface 331, and also between the corresponding nanostructure layer 370 and the object-side outer peripheral surface 341. The other of the two connecting structure layers 360 is disposed between the corresponding nanostructure layer 370 and the image-side optically effective surface 332, and also between the corresponding nanostructure layer 370 and the image-side outer peripheral surface 342. Alternatively, it can be said that the two nanostructure layers 370 are respectively disposed on the top layer of the corresponding connecting structure layer 360. Furthermore, the material of the connecting structure layer 360 may include a non-metallic oxide, for example, the connecting structure layer 360 may include a silicon dioxide film layer.
[0162] Figure 1L In the leftmost diagram, the nanostructure layer range 370a represents the range of the nanostructure layer 370, but not its height. The average height of the nanostructure layer 370 can be between 90 nm and 350 nm. Furthermore, the average height of the nanostructure layer 370 can be between 125 nm and 300 nm. Additionally, the average height of the nanostructure layer 370 can be between 195 nm and 255 nm. Moreover, the material of the nanostructure layer 370 can include metal oxides.
[0163] Figure 1N Draw Figure 1A A schematic diagram of the third lens 400 of the camera module 100 (also a diagram showing the relationship between the cross-sectional view and the image side view). Figure 10 Draw Figure 1A A three-dimensional cross-sectional view of the third lens 400 of the camera module 100. Please refer to... Figures 1F to 1I , Figure 1Nand Figure 10 The third lens 400 of the imaging lens 110 of the camera module 100 includes an optical effective part 430, an outer peripheral part 440, a light-shielding coating 450, and a nanostructure layer 470.
[0164] Please refer to Figure 1A The optical axis z passes through the optically effective portion 430 of the third lens 400. The optically effective portion 430 includes an object-side optically effective surface 431 and an image-side optically effective surface 432. The object-side optically effective surface 431 faces the object side of the imaging lens 110, and the image-side optically effective surface 432 faces the image side of the imaging lens 110 and is disposed opposite to the object-side optically effective surface 431. The outer peripheral portion 440 of the third lens 400 surrounds the optically effective portion 430 and includes an object-side outer peripheral surface 441, an image-side outer peripheral surface 442, and an outer diameter surface 443. The object-side outer peripheral surface 441 faces the object side of the imaging lens 110, the image-side outer peripheral surface 442 faces the image side of the imaging lens 110 and is disposed opposite to the object-side outer peripheral surface 441, and the outer diameter surface 443 connects the object-side outer peripheral surface 441 and the image-side outer peripheral surface 442.
[0165] Please refer to Figures 1F to 1I , Figure 1N and Figure 10 The light-shielding coating 450 of the third lens 400 is disposed on at least one of the object-side outer peripheral surface 441 and the image-side outer peripheral surface 442 and includes a tapered portion 454. The tapered portion 454 tapers toward the center of the optical effective portion 430 and tapers to the vicinity of the junction 445 between the optical effective portion 430 and the outer peripheral portion 440. Specifically, the light-shielding coating 450 is disposed on the object-side outer peripheral surface 441 and the image-side outer peripheral surface 442. Two tapered portions 454 are respectively disposed on the object-side outer peripheral surface 441 and the image-side outer peripheral surface 442 and tapered toward the center of the optical effective portion 430. The tapered portion 454 disposed on the object-side outer peripheral surface 441 tapered to near the junction 445 of the object-side optical effective surface 431 and the object-side outer peripheral surface 441. The tapered portion 454 disposed on the image-side outer peripheral surface 442 tapered to near the junction 445 of the image-side optical effective surface 432 and the image-side outer peripheral surface 442.
[0166] The nanostructure layer 470 of the third lens 400 is disposed on the optical effective portion 430 and the tapered portion 454 of the light-shielding coating 450. The nanostructure layer 470 has multiple irregular ridge-like protrusions 476. The tapered portion 454 of the light-shielding coating 450 forms a light-transmitting hole 457 along the z-direction around the optical axis near the junction 445. Specifically, one of the two nanostructure layers 470 is disposed on the tapered portion 454 of the light-shielding coating 450 on the object-side optical effective surface 431 and the object-side outer peripheral surface 441. The tapered portion 454 forms a light-transmitting hole 457 along the z-direction around the optical axis near the corresponding junction 445. The other of the two nanostructure layers 470 is disposed on the tapered portion 454 of the light-shielding coating 450 on the image-side optical effective surface 432 and the image-side outer peripheral surface 442. The tapered portion 454 forms another light-transmitting hole 457 along the z-direction around the optical axis near the corresponding junction 445 (e.g., ...). Figure 1N As shown in the enlarged view at the top right, the position of the light-transmitting aperture 457 and the corresponding junction 445 are the same or very close.
[0167] For details, please refer to Figure 1N The roundness tolerance value of aperture 457 is t, which satisfies the following condition: t < 0.02 mm. Furthermore, it satisfies the following condition: t < 0.01 mm. Moreover, it satisfies the following condition: t < 0.005 mm. For example... Figure 1N As shown in the enlarged view at the top right, the light-transmitting hole 457 is an ideal light-transmitting hole shape 457b that is not actually a perfect circle, and the roundness tolerance value t of the light-transmitting hole 457 is defined based on the difference between the upper limit of roundness t1 and the lower limit of roundness t2.
[0168] The third lens 400 may be a glass lens. The object-side optical effective surface 431 and the image-side optical effective surface 432 of the optical effective part 430 may both be smooth surfaces. The object-side outer peripheral surface 441 and the image-side outer peripheral surface 442 may both be provided with a light-shielding coating 450 and may both be smooth surfaces.
[0169] Please refer to Figure 1N , Figure 1N The light-shielding coating range 450a in the leftmost figure represents the range of the light-shielding coating 450 but not its height. The light-shielding coating 450 is further disposed on the outer diameter surface 443, that is, the light-shielding coating 450 is disposed on the object-side outer peripheral surface 441, the image-side outer peripheral surface 442, and the outer diameter surface 443. Specifically, the light-shielding coating 450 essentially coats the entire surface of the outer peripheral portion 440.
[0170] Please refer to Figure 1G , Figure 1I and Figure 10The third lens 400 further includes a connecting structure layer 460, which is disposed between the nanostructure layer 470 and the optically effective portion 430, and also between the nanostructure layer 470 and the outer peripheral portion 440. Specifically, the third lens 400 further includes two connecting structure layers 460. One of the two connecting structure layers 460 is disposed between the corresponding nanostructure layer 470 and the object-side optically effective surface 431, and also between the corresponding nanostructure layer 470 and the object-side outer peripheral surface 441. The other of the two connecting structure layers 460 is disposed between the corresponding nanostructure layer 470 and the image-side optically effective surface 432, and also between the corresponding nanostructure layer 470 and the image-side outer peripheral surface 442. Alternatively, it can be said that the two nanostructure layers 470 are respectively disposed on the top layer of the corresponding connecting structure layers 460. Furthermore, the material of the connecting structure layer 460 may include non-metallic oxides, and the connecting structure layer 460 may also be composed of multiple or specifically three film layers with different refractive indices that are stacked alternately, and the connecting structure layer 460 includes at least one silicon dioxide film layer.
[0171] Figure 1P Draw Figure 1A Images of the nanostructure layer 470 of the camera module 100 as observed by an electron microscope. Figure 1Q Draw Figure 1A Another image of the nanostructure layer 470 of the camera module 100 as observed by an electron microscope. Please refer to... Figure 1P and Figure 1Q The surface of the nanostructure layer 470 of the third lens 400 has multiple pore structures, and the exposed portion of the pore structure of the connecting structure layer 460 is in contact with air.
[0172] Figure 1R Draw Figure 1A The image obtained by electron microscopy shows the cross-section of the nanostructure layer 470, the connecting structure layer 460, and the optical effective part 430 of the third lens 400 in the camera module 100. Figure 1S Draw Figure 1A Another image observed with an electron microscope showing a cross-section of the nanostructure layer 470, the connecting structure layer 460, and the optical effective part 430 of the camera module 100. Figure 1T Draw Figure 1A A further image of the cross-section of the nanostructure layer 470, the connecting structure layer 460, and the optical effective part 430 of the camera module 100, observed using an electron microscope. Please refer to... Figure 1N , Figures 1R to 1T , Figure 1NThe leftmost diagram shows the range 470a of the nanostructure layer, which represents the range of the nanostructure layer 470 but not its height. The average height of the nanostructure layer 470 can be between 90 nm and 350 nm. Furthermore, the average height of the nanostructure layer 470 can be between 125 nm and 300 nm. Additionally, the average height of the nanostructure layer 470 can be between 195 nm and 255 nm. Moreover, the material of the nanostructure layer 470 can include metal oxides. Figures 1R to 1T The cross-section (i.e., transverse section) of the third lens 400 observed by an electron microscope, shown, from top to bottom, consists of a nanostructure layer 470, a connecting structure layer 460, and an optical effective part 430. Specifically, in Figure 1R In the model, the height (thickness) No. 1 of the connecting structure layer 460 is 73.68 nm, and the maximum height (thickness) No. 2 of the nanostructure layer 470 is 200.3 nm; Figure 1S In the structure, the height of the first connecting layer 460 is 76.62 nm, and the maximum height of the second nanostructure layer 470 is 232.7 nm. Figure 1T In the diagram, the height of the first connecting structure layer 460 is 75.15 nm, and the maximum height of the second nanostructure layer 470 is 247.4 nm.
[0173] <Second Embodiment>
[0174] Figure 2A A schematic diagram (also a cross-sectional view) of the camera module 500 according to the second embodiment of this disclosure is shown below. Figure 2A The camera module 500 includes an imaging lens 510, a filter element 548, and an electronic image sensor 560. The filter element 548 is disposed between the imaging lens 510 and the imaging surface 550 of the camera module 500 (i.e., the imaging surface 550 of the imaging lens 510), and the electronic image sensor 560 is disposed on the imaging surface 550 of the camera module 500. The imaging lens 510 includes multiple optical elements (such as a first lens 600, a second lens 537, a light-shielding plate, a spacer ring, a fixing ring, etc.) and a lens barrel 520. Figure 2A The complete structure of some optical elements is not shown in the figure. The lens barrel 520 houses the optical elements, and the optical axis z passes through the optical elements. One of the optical elements is the first lens 600.
[0175] Figure 2B Draw Figure 2A A 2B magnified view of a portion of the 500-type camera module. Figure 2C Draw Figure 2B A magnified 2C view of a portion of the 500-type camera module. Figure 2D Draw Figure 2B A magnified 2D view of a portion of the camera module 500. Figure 2E Draw Figure 2B A magnified 2E view of a portion of the 500-type camera module. Figure 2F Draw Figure 2A A schematic diagram of the first lens 600 of the camera module 500 (also a diagram showing the relationship between the cross-sectional view and the image side view). Figure 2G Draw Figure 2A A three-dimensional cross-sectional view of the first lens 600 of the camera module 500. Please refer to... Figures 2A to 2G The first lens 600 of the imaging lens 510 of the camera module 500 includes an optical effective part 630, an outer peripheral part 640, a light-shielding coating 650, and a nanostructure layer 670.
[0176] Please refer to Figure 2A The optical axis z passes through the optically effective portion 630 of the first lens 600. The optically effective portion 630 includes an object-side optically effective surface 631 and an image-side optically effective surface 632. The object-side optically effective surface 631 faces the object side of the imaging lens 510 (i.e., the image side). Figure 2A The left side of the image lens 510 (i.e., the image-side effective optical surface 632 faces the image side of the imaging lens 510). Figure 2A The outer peripheral portion 640 of the first lens 600 surrounds the optically effective portion 630 and includes an object-side outer peripheral surface 641, an image-side outer peripheral surface 642, and an outer diameter surface 643. The object-side outer peripheral surface 641 faces the object side of the imaging lens 510, the image-side outer peripheral surface 642 faces the image side of the imaging lens 510 and is disposed opposite to the object-side outer peripheral surface 641, and the outer diameter surface 643 connects the object-side outer peripheral surface 641 and the image-side outer peripheral surface 642.
[0177] Please refer to Figures 2B to 2G The light-shielding coating 650 of the first lens 600 is disposed on at least one of the object-side outer peripheral surface 641 and the image-side outer peripheral surface 642 and includes a tapered portion 654. The tapered portion 654 tapers toward the center of the optically effective portion 630 and tapers to the vicinity of the junction 645 between the optically effective portion 630 and the outer peripheral portion 640. Specifically, the light-shielding coating 650 is disposed on the object-side outer peripheral surface 641 and the image-side outer peripheral surface 642. Two tapered portions 654 are respectively disposed on the object-side outer peripheral surface 641 and the image-side outer peripheral surface 642 and tape towards the center of the optical effective portion 630. The tapered portion 654 disposed on the object-side outer peripheral surface 641 tapes down to near the junction 645 of the object-side optical effective surface 631 and the object-side outer peripheral surface 641. The tapered portion 654 disposed on the image-side outer peripheral surface 642 tapes down to near the junction 645 of the image-side optical effective surface 632 and the image-side outer peripheral surface 642.
[0178] The nanostructure layer 670 of the first lens 600 is disposed on the optical effective portion 630 and the tapered portion 654 of the light-shielding coating 650. The nanostructure layer 670 has multiple irregular ridge-like protrusions 676. The tapered portion 654 of the light-shielding coating 650 forms a light-transmitting hole 657 along the z-direction surrounding the optical axis near the junction 645. Specifically, one of the two nanostructure layers 670 is disposed on the tapered portion 654 of the light-shielding coating 650 on the object-side optical effective surface 631 and the object-side outer peripheral surface 641. The tapered portion 654 forms a light-transmitting hole 657 along the z-direction surrounding the optical axis near the corresponding junction 645. The other of the two nanostructure layers 670 is disposed on the tapered portion 654 of the light-shielding coating 650 on the image-side optical effective surface 632 and the image-side outer peripheral surface 642. The tapered portion 654 forms another light-transmitting hole 657 along the z-direction surrounding the optical axis near the corresponding junction 645 (e.g., ...). Figure 2F As shown in the enlarged view at the top right, the position of the light-transmitting hole 657 and the corresponding junction 645 are very close.
[0179] For details, please refer to Figure 2F The roundness tolerance value of the light-transmitting aperture 657 is t, which satisfies the following condition: t < 0.02 mm. Furthermore, it satisfies the following condition: t < 0.01 mm. Moreover, it satisfies the following condition: t < 0.005 mm. For example... Figure 2F As shown in the enlarged view at the top right, the light-transmitting hole 657 is an ideal light-transmitting hole shape 657b that is not actually a perfect circle, and the roundness tolerance value t of the light-transmitting hole 657 is defined based on the difference between the upper limit of roundness t1 and the lower limit of roundness t2.
[0180] The first lens 600 may be a glass lens. The object-side optical effective surface 631 and the image-side optical effective surface 632 of the optical effective part 630 may both be smooth surfaces. The object-side outer peripheral surface 641 and the image-side outer peripheral surface 642 may both be provided with a light-shielding coating 650 and may both be smooth surfaces.
[0181] Please refer to Figure 2F , Figure 2F The light-shielding coating range 650a in the leftmost figure represents the range of the light-shielding coating 650 but not its height. The light-shielding coating 650 is further disposed on the outer diameter surface 643, that is, the light-shielding coating 650 is disposed on the object-side outer peripheral surface 641, the image-side outer peripheral surface 642, and the outer diameter surface 643. Specifically, the light-shielding coating 650 essentially coats the entire surface of the outer peripheral portion 640.
[0182] Please refer to Figures 2C to 2E and Figure 2GThe first lens 600 further includes a connecting structure layer 660, which is disposed between the nanostructure layer 670 and the optically effective portion 630, and also between the nanostructure layer 670 and the outer peripheral portion 640. Specifically, the first lens 600 further includes two connecting structure layers 660. One of the two connecting structure layers 660 is disposed between the corresponding nanostructure layer 670 and the object-side optically effective surface 631, and also between the corresponding nanostructure layer 670 and the object-side outer peripheral surface 641. The other of the two connecting structure layers 660 is disposed between the corresponding nanostructure layer 670 and the image-side optically effective surface 632, and also between the corresponding nanostructure layer 670 and the image-side outer peripheral surface 642. Alternatively, it can be said that the two nanostructure layers 670 are respectively disposed on the top layer of the corresponding connecting structure layers 660. Furthermore, the material of the connecting structure layer 660 may include non-metallic oxides, and the connecting structure layer 660 may also be composed of multiple or specifically two films with different refractive indices that are stacked alternately, and the connecting structure layer 660 includes at least one silicon dioxide film layer.
[0183] Please refer to Figures 2C to 2G ,in Figure 2F The leftmost diagram shows the range 670a of the nanostructure layer, which represents the range of the nanostructure layer 670 but not its height. The average height of the nanostructure layer 670 can be between 90 nm and 350 nm. Furthermore, the average height of the nanostructure layer 670 can be between 125 nm and 300 nm. Additionally, the average height of the nanostructure layer 670 can be between 195 nm and 255 nm. Moreover, the material of the nanostructure layer 670 can include metal oxides.
[0184] Please refer to Figure 2A , Figure 2B and Figure 2D The first lens 600 further includes an axial connecting structure 680 disposed on the object-side outer peripheral surface 641. The lens barrel 520 includes an axial alignment structure 521, which connects to the axial connecting structure 680, aligning the first lens 600 with the optical axis z. The lens barrel 520 and the first lens 600 are then fitted together. Furthermore, the light-shielding coating 650 of the first lens 600 extends from the outer diameter surface 643 to the axial connecting structure 680.
[0185] <Third Embodiment>
[0186] Figure 3A A schematic diagram of an electronic device 70 according to a third embodiment of this disclosure is shown. Figure 3B Draw Figure 3A Block diagram of electronic device 70. Please refer to... Figure 3A and Figure 3BThe electronic device 70 includes a camera module 700, which includes an imaging lens 710 and an electronic photosensitive element 760. The electronic photosensitive element 760 is disposed on the imaging surface of the camera module 700 (i.e., the imaging surface of the imaging lens 710). The camera module 700 may be the camera module 100 of the first embodiment, the camera module 500 of the second embodiment, or other camera modules according to the present disclosure.
[0187] Specifically, the electronic device 70 is a smartphone and includes four camera modules 700, the four camera modules 700 being... Figure 3A From left to right, the four camera modules 700 can be arranged in the following order: an ultra-wide-angle lens (e.g., with a maximum angle of view of 93 to 175 degrees), a wide-angle main lens (e.g., with a maximum angle of view of 65 to 90 degrees), a telephoto lens (e.g., with a maximum angle of view of 20 to 50 degrees), and a super telephoto lens (e.g., with a maximum angle of view of 5 to 20 degrees). The maximum angle of view of each camera module 700 is not limited to these parameters. The four camera modules 700 are housed within the internal space 73 of the electronic device 70, and light enters each of the four camera modules 700 through four light-entry holes in the lens cover 72 on the outer casing 71 of the electronic device 70. It should be understood that... Figure 3A This is only an exploded view of the lens cover 72 and the internal space 73, and does not indicate that the lens cover 72 and other parts of the electronic device 70 are separated during normal use.
[0188] In addition, the electronic device 70 may also include, but is not limited to, a control unit, a storage unit, a temporary storage unit (RAM), a read-only storage unit (ROM), or a combination thereof.
[0189] Furthermore, the user enters the shooting mode through the user interface 75 of the electronic device 70. At this time, the imaging lens 710 gathers the imaging light onto the electronic image sensor 760 and outputs the electronic signal related to the image to the image signal processor (ISP) 74.
[0190] Depending on the camera specifications of the electronic device 70, each camera module 700 may also include an optical image stabilization component 790, which may be an OIS image stabilization feedback device. Furthermore, the electronic device 70 may also include at least one auxiliary optical element (not otherwise labeled) and at least one sensing element 76. In the third embodiment, the auxiliary optical elements are a flash module 77 and a focus assist module 78. The flash module 77 can be used to compensate for color temperature, and the focus assist module 78 may be an infrared rangefinder, a laser focus module, etc. The sensing element 76 may have the function of sensing physical momentum and kinetic energy, such as an accelerometer, gyroscope, or Hall effect element, to sense the shaking and tremors caused by the user's hand or the external environment. This facilitates the performance of the autofocus function and optical image stabilization component 790 configured in the camera modules 700 of the electronic device 70, resulting in good image quality. This helps the electronic device 70 according to the present disclosure to have multiple shooting modes, such as optimized Selfie, low-light HDR (High Dynamic Range) imaging, and high-resolution 4K video recording. In addition, the user can directly view the captured image through the user interface (i.e., display screen, touch screen) 75 and manually operate the framing on the user interface 75 to achieve a WYSIWYG autofocus function.
[0191] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.
Claims
1. An imaging lens, characterized in that, Include: A plurality of optical elements, wherein an optical axis passes through the plurality of optical elements, and at least one of the plurality of optical elements is a lens; and A lens tube housing the plurality of optical elements; The lens includes: An optical effective part, wherein the optical axis passes through the optical effective part, the optical effective part comprising: An object-side optical effective surface, facing the object side of the imaging lens; and An image-side optical effective surface is positioned facing the image side of the imaging lens and opposite to the object-side optical effective surface. An outer periphery surrounds the optically effective portion and includes: An object-side outer peripheral surface faces the object side of the imaging lens; An image-side outer peripheral surface is disposed facing the image side of the imaging lens and opposite to the object-side outer peripheral surface; and An outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface; A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes: A tapering portion gradually tapers toward the center of the optically effective portion, and the tapering portion tapers near a junction between the optically effective portion and the outer peripheral portion. A nanostructure layer is disposed on the tapered portion of the optically effective part and the light-shielding coating, the nanostructure layer having multiple irregular ridge-like protrusions; and A connecting structure layer is disposed between the nanostructure layer and the optical effective part, and between the nanostructure layer and the outer peripheral part; The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. Wherein, the tapered portion of the light-shielding coating forms a light-transmitting hole near the junction along the direction surrounding the optical axis, and the roundness tolerance value of the light-transmitting hole is t, which satisfies the following condition: t < 0.02 mm.
2. The imaging lens as described in claim 1, characterized in that, Both the object-side and image-side optical effective surfaces of the optical effective portion are smooth surfaces, and at least one of the object-side and image-side outer peripheral surfaces on which the light-shielding coating is disposed in the outer peripheral portion is a smooth surface.
3. The imaging lens as described in claim 1, characterized in that, The average height of this nanostructure layer ranges from 90 nm to 350 nm.
4. The imaging lens as described in claim 3, characterized in that, The average height of the nanostructure layer ranges from 125 nm to 300 nm.
5. The imaging lens as described in claim 4, characterized in that, The average height of the nanostructure layer ranges from 195 nm to 255 nm.
6. The imaging lens as described in claim 1, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.01 mm.
7. The imaging lens as described in claim 6, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.005 mm.
8. The imaging lens as described in claim 3, characterized in that, The light-shielding coating is further applied to the outer diameter surface.
9. The imaging lens as described in claim 8, characterized in that, The light-shielding coating is disposed on the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface.
10. The imaging lens as described in claim 8, characterized in that, The lens also includes: At least one axial connection structure is provided for connecting an adjacent optical element and aligning it with the optical axis of the adjacent optical element.
11. The imaging lens as described in claim 10, characterized in that, The light-shielding coating extends from the outer diameter surface to the at least one axial connection structure.
12. A camera module, characterized in that, Include: The imaging lens as described in claim 1.
13. An electronic device, characterized in that, Include: The camera module as claimed in claim 12, wherein the camera module further includes an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the camera module.
14. An imaging lens, characterized in that, Include: A plurality of optical elements, wherein an optical axis passes through the plurality of optical elements, and at least one of the plurality of optical elements is a lens; and A lens tube housing the plurality of optical elements; The lens includes: An optical effective part, wherein the optical axis passes through the optical effective part, the optical effective part comprising: An object-side optical effective surface, facing the object side of the imaging lens; and An image-side optical effective surface is positioned facing the image side of the imaging lens and opposite to the object-side optical effective surface. An outer periphery surrounds the optically effective portion and includes: An object-side outer peripheral surface faces the object side of the imaging lens; An image-side outer peripheral surface is disposed facing the image side of the imaging lens and opposite to the object-side outer peripheral surface; and An outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface; A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes: A tapering portion gradually tapers toward the center of the optically effective portion, and the tapering portion tapers near a junction between the optically effective portion and the outer peripheral portion. A nanostructure layer is disposed on the tapered portion of the optical effective part and the light-shielding coating, and the nanostructure layer has multiple irregular ridge-like protrusions. At least one axial connection structure; and A connecting structure layer is disposed between the nanostructure layer and the optical effective part, and between the nanostructure layer and the outer peripheral part; The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. The lens tube includes: An axial alignment structure is provided, which connects the at least one axial connection structure to align the lens with the optical axis; Wherein, the tapered portion of the light-shielding coating forms a light-transmitting hole near the junction along the direction surrounding the optical axis, and the roundness tolerance value of the light-transmitting hole is t, which satisfies the following condition: t < 0.02 mm.
15. The imaging lens as described in claim 14, characterized in that, Both the object-side and image-side optical effective surfaces of the optical effective portion are smooth surfaces, and at least one of the object-side and image-side outer peripheral surfaces on which the light-shielding coating is disposed in the outer peripheral portion is a smooth surface.
16. The imaging lens as described in claim 14, characterized in that, The average height of this nanostructure layer ranges from 90 nm to 350 nm.
17. The imaging lens as described in claim 16, characterized in that, The average height of the nanostructure layer ranges from 125 nm to 300 nm.
18. The imaging lens as described in claim 17, characterized in that, The average height of the nanostructure layer ranges from 195 nm to 255 nm.
19. The imaging lens as described in claim 14, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.01 mm.
20. The imaging lens as described in claim 19, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.005 mm.
21. The imaging lens as described in claim 14, characterized in that, The lens is a glass lens.
22. The imaging lens as described in claim 16, characterized in that, The light-shielding coating is further applied to the outer diameter surface.
23. The imaging lens as described in claim 22, characterized in that, The light-shielding coating is disposed on the object-side outer peripheral surface, the image-side outer peripheral surface, and the outer diameter surface.
24. The imaging lens as described in claim 22, characterized in that, The light-shielding coating extends from the outer diameter surface to the at least one axial connection structure.
25. An imaging lens, characterized in that, Include: A plurality of optical elements, wherein an optical axis passes through the plurality of optical elements, and at least one of the plurality of optical elements is a lens; and A lens tube housing the plurality of optical elements; The lens includes: An optical effective part, wherein the optical axis passes through the optical effective part, the optical effective part comprising: An object-side optical effective surface, facing the object side of the imaging lens; and An image-side optical effective surface is positioned facing the image side of the imaging lens and opposite to the object-side optical effective surface. An outer periphery surrounds the optically effective portion and includes: An object-side outer peripheral surface faces the object side of the imaging lens; An image-side outer peripheral surface is disposed facing the image side of the imaging lens and opposite to the object-side outer peripheral surface; and An outer diameter surface connects the object-side outer peripheral surface and the image-side outer peripheral surface; A light-shielding coating is disposed on at least one of the object-side outer peripheral surface and the image-side outer peripheral surface and includes: A tapering portion gradually tapers toward the center of the optically effective portion, and the tapering portion tapers near a junction between the optically effective portion and the outer peripheral portion. A nanostructure layer is disposed on the tapered portion of the optically effective part and the light-shielding coating, the nanostructure layer having multiple irregular ridge-like protrusions; and A connecting structure layer is disposed between the nanostructure layer and the optical effective part, and between the nanostructure layer and the outer peripheral part; The surface of the nanostructure layer has multiple pore structures, and the exposed portion of the connecting structure layer is in contact with air. In this process, the tapered portion of the light-shielding coating forms a light-transmitting hole near the junction along the direction surrounding the optical axis.
26. The imaging lens as described in claim 25, characterized in that, Both the object-side and image-side optical effective surfaces of the optical effective portion are smooth surfaces, and at least one of the object-side and image-side outer peripheral surfaces on which the light-shielding coating is disposed in the outer peripheral portion is a smooth surface.
27. The imaging lens as described in claim 26, characterized in that, The average height of this nanostructure layer ranges from 90 nm to 350 nm.
28. The imaging lens as described in claim 27, characterized in that, The average height of the nanostructure layer ranges from 125 nm to 300 nm.
29. The imaging lens as described in claim 28, characterized in that, The average height of the nanostructure layer ranges from 195 nm to 255 nm.
30. The imaging lens as described in claim 27, characterized in that, The roundness tolerance of the aperture is t, which satisfies the following condition: t < 0.02 mm.
31. The imaging lens as described in claim 30, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.01 mm.
32. The imaging lens as described in claim 31, characterized in that, The roundness tolerance value of the aperture is t, which satisfies the following condition: t < 0.005 mm.
33. The imaging lens as described in claim 27, characterized in that, The nanostructure layer is a metal oxide structure layer.
34. The imaging lens as described in claim 25, characterized in that, The connecting structure layer is a non-metallic oxide structure layer.
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