Imaging lens and electronic device

Abstract

An imaging lens and an electronic device. The imaging lens has an optical axis and includes a lens group. The lens group includes a plurality of lenses arranged along the optical axis and includes a first lens and at least one anti-reflection film. The first lens includes a first object side surface and a first image side surface. The optical axis passes through the first object side surface. The first image side surface is arranged opposite the first object side surface along the direction of the optical axis. The anti-reflection film is arranged on at least one of the first object side surface and the first image side surface. The anti-reflection film includes a nanostructure layer and an intermediate layer. The nanostructure layer includes a main component of aluminum oxide and includes a plurality of ridge-shaped protrusions that are not directionally extended and taper from a bottom to a top. The ridge-shaped protrusions of the anti-reflection film help to form a gradient refractive index to provide better low reflectance performance.

Description

Technical Field

[0001] The present disclosure relates to an imaging lens, and in particular to an imaging lens applied to portable electronic devices. Background Art

[0002] In recent years, portable electronic devices have developed rapidly, such as smart electronic devices, tablet computers, etc., which have been pervasive in the lives of modern people, and the imaging lenses mounted on portable electronic devices have also thrived accordingly. However, as technology advances increasingly, users have higher and higher requirements for the imaging quality of imaging lenses. Therefore, developing an imaging lens capable of improving imaging quality has become an important and urgent problem to be solved in the industry. Contents of the Utility Model

[0003] The present disclosure provides an imaging lens and an electronic device, wherein the ridge-shaped protrusions of the anti-reflection film facilitate the formation of a gradient refractive index, which can provide better low reflectivity performance for light of different wavelengths and different incident angles of light.

[0004] According to one aspect of the present disclosure, an imaging lens is provided, having an optical axis and comprising a lens group. The lens group includes a plurality of lenses, which are arranged along the optical axis and comprise a first lens, a second lens and at least two anti-reflection films. The first lens includes a first object-side surface and a first image-side surface, wherein the optical axis passes through the first object-side surface, and the first image-side surface is disposed opposite to the first object-side surface along the direction of the optical axis. The second lens includes a second object-side surface and a second image-side surface, wherein the optical axis passes through the second object-side surface, and the second image-side surface is disposed opposite to the second object-side surface along the direction of the optical axis. The anti-reflection films are respectively disposed on at least one of the first object-side surface and the first image-side surface, and on at least one of the second object-side surface and the second image-side surface. Each anti-reflection film includes a nanostructure layer and an intermediate layer, wherein the intermediate layer is disposed between the nanostructure layer and the at least one surface. The nanostructure layer includes a plurality of non-directionally extending ridge-shaped protrusions, the ridge-shaped protrusions extend tapering from a bottom to a top, and the average structural height of the ridge-shaped protrusions is greater than 26 nm and less than 356 nm. The reflectivity of each anti-reflection film corresponding to a wavelength of 400 nm to 680 nm can be divided into two wavelength bands, which are sequentially divided into a first wavelength band and a second wavelength band from short to long wavelength. The first wavelength band ranges from 400 nm to 470 nm, and the minimum reflectivity in the first wavelength band is a first reference value, which is RV1. The second wavelength band ranges from 480 nm to 580 nm, and the maximum reflectivity in the second wavelength band is a second reference value, which is RV2, satisfying the following conditions: 0%<RV1<0.1%; and 0.1%<RV2<1%.

[0005] Based on the aforementioned imaging lens, the average reflectance of the second band is RA2, which satisfies the following condition: 0.5%. <RA2<0.9%。

[0006] Based on the aforementioned imaging lens, where the second reference value is RV2, it satisfies the following condition: 0.5%. <RV2<1%。

[0007] Based on the aforementioned imaging lens, the average reflectance of the second band is RA2, which satisfies the following condition: 0.1%. <RA2<0.35%。

[0008] Based on the aforementioned imaging lens, where the second reference value is RV2, it satisfies the following condition: 0.15%. <RV2<0.5%。

[0009] Based on the aforementioned imaging lens, the reflectivity of each antireflective film corresponding to wavelengths from 400nm to 680nm is further divided into a third band. This third band is between 600nm and 680nm, and the minimum reflectivity in this third band is a third reference value, RV3, which satisfies the following condition: 0%. <RV3<0.1%。

[0010] Based on the aforementioned imaging lens, the average reflectance of the first band is RA1, which satisfies the following condition: 0% <RA1<0.2%。

[0011] Based on the aforementioned imaging lens, the average reflectance of the third band is RA3, which satisfies the following condition: 0% <RA3<0.1%。

[0012] Based on the aforementioned imaging lens, the distance D between the first object-side surface and the first image-side surface near the optical axis satisfies the following condition: 0.1 mm. <D≤0.42mm。

[0013] According to the aforementioned imaging lens, it may further include a third lens, which includes a third object-side surface and a third image-side surface. The optical axis passes through the third object-side surface. The third image-side surface is disposed opposite to the third object-side surface along the direction of the optical axis. The number of anti-reflective coatings is at least three, and one of the anti-reflective coatings is disposed on at least one of the third object-side surface and the third image-side surface of the third lens. The anti-reflective coating disposed on the third lens further distinguishes a third wavelength band corresponding to a reflectance of 400nm to 680nm, the third wavelength band being between 600nm and 680nm, and the minimum reflectance in the third wavelength band being a third reference value, the third reference value being RV3, which satisfies the following condition: 0%. <RV3<0.1%。

[0014] Based on the aforementioned imaging lens, the average reflectance of the anti-reflective coating corresponding to wavelengths from 400nm to 680nm is Ravg, which satisfies the following condition: 0%. <Ravg<0.6%。

[0015] The imaging lens according to the aforementioned embodiment, wherein the first reference value is RV1 and the second reference value is RV2, which satisfies the following condition: 5<RV2 / RV1<70.

[0016] The imaging lens according to the aforementioned embodiment, wherein the number of lenses in the lens group is at least seven.

[0017] The imaging lens according to the aforementioned embodiment, wherein the top of the intermediate layer is partially covered by the nanostructure layer.

[0018] The imaging lens according to the aforementioned embodiment, wherein the average structural height of the ridge protrusions is greater than 41 nm and less than 236 nm.

[0019] The imaging lens according to the aforementioned embodiment, wherein in the lens group, the number of lenses provided with an antireflection film accounts for at least 40% of the total number of lenses.

[0020] According to one embodiment of the present disclosure, an imaging lens is provided, which has an optical axis and includes a lens group. The lens group includes a plurality of lenses, the lenses are arranged along the optical axis, and include a first lens and at least one antireflection film. The first lens includes a first object side surface and a first image side surface. The optical axis passes through the first object side surface. The first image side surface is disposed opposite to the first object side surface in the direction along the optical axis. The antireflection film is disposed on at least one of the first object side surface and the first image side surface. Each antireflection film includes a nanostructure layer and an intermediate layer. The nanostructure layer includes a plurality of non-directionally extending ridge protrusions, and the ridge protrusions extend in a tapering manner from a bottom portion to a top portion, with the average structural height of the ridge protrusions being greater than 26 nm and less than 356 nm. The intermediate layer is disposed between the nanostructure layer and the surface. The distance between the first object side surface and the first image side surface adjacent to the optical axis is D, which satisfies the following condition: 0.1mm<D≤0.42mm. The reflectivity of the antireflection film corresponding to wavelengths from 400 nm to 680 nm can be divided into two wavebands, which are sequentially divided into a first waveband and a second waveband from shorter wavelength to longer wavelength. The first waveband ranges from 400 nm to 470 nm, the minimum reflectivity value in the first waveband is a first reference value, and the first reference value is RV1. The second waveband ranges from 480 nm to 580 nm, the maximum reflectivity value in the second waveband is a second reference value, and the second reference value is RV2, which satisfies the following conditions: 0%<RV1<0.1%; and 0.5%<RV2<1%.

[0021] The imaging lens according to the aforementioned embodiment, wherein the distance between the first object side surface and the first image side surface adjacent to the optical axis is D, which satisfies the following condition: 0.15mm<D≤0.375mm.

[0022] The imaging lens according to the aforementioned embodiment, wherein the average reflectivity of the second waveband is RA2, which satisfies the following condition: 0.5%<RA2<0.9%.

[0023] Based on the aforementioned imaging lens, the average reflectance of the first band is RA1, which satisfies the following condition: 0% <RA1<0.2%。

[0024] Based on the aforementioned imaging lens, the average reflectance of the anti-reflective coating corresponding to wavelengths from 400nm to 680nm is Ravg, which satisfies the following condition: 0%. <Ravg<0.6%。

[0025] Based on the aforementioned imaging lens, where the first reference value is RV1 and the second reference value is RV2, it satisfies the following condition: 5 <RV2 / RV1<70。

[0026] The imaging lens of the aforementioned type has at least seven lenses in the lens group.

[0027] Based on the aforementioned imaging lens, the top of the intermediate layer is partially covered by a nanostructure layer.

[0028] Based on the aforementioned imaging lens, the average height of the ridge-like protrusions is greater than 41 nm and less than 236 nm.

[0029] According to this disclosure, an electronic device is provided, comprising an imaging lens of any of the aforementioned types. Attached Figure Description

[0030] Figure 1A A schematic diagram of an imaging lens according to the first embodiment of this disclosure is shown;

[0031] Figure 1B Drawing according to Figure 1A A schematic diagram of the first lens in the first embodiment;

[0032] Figure 1C Drawing according to Figure 1A A schematic diagram of the second lens in the first embodiment;

[0033] Figure 2A A schematic diagram of an imaging lens according to the second embodiment of this disclosure is shown;

[0034] Figure 2B Drawing according to Figure 2A A schematic diagram of the first lens in the second embodiment;

[0035] Figure 3A A schematic diagram illustrating the reflectivity-wavelength of the antireflection film deposited on the test lens according to the first, second, third, and fourth embodiments;

[0036] Figure 3BA schematic diagram showing the reflectivity-wavelength of the antireflection film deposited on the test lens in the fifth, sixth, seventh, and eighth embodiments;

[0037] Figure 3C A schematic diagram showing the reflectivity-wavelength of the antireflection film deposited on the test lens in the ninth, tenth, eleventh, and twelfth embodiments;

[0038] Figure 3D A schematic diagram illustrating the reflectivity-wavelength of the antireflective film deposited on the test lens in the thirteenth, fourteenth, fifteenth, and sixteenth embodiments;

[0039] Figure 3E A schematic diagram illustrating the reflectivity-wavelength of the antireflective film deposited on the test lens in the seventeenth, eighteenth, nineteenth, and twentieth embodiments;

[0040] Figure 4A A schematic diagram illustrating the electronic device according to the third embodiment of this disclosure;

[0041] Figure 4B Drawing according to Figure 4A Another schematic diagram of the electronic device in the third embodiment;

[0042] Figure 4C Drawing according to Figure 4A A schematic diagram of an image captured by an electronic device in the third embodiment;

[0043] Figure 4D Drawing according to Figure 4A Another image diagram captured by the electronic device in the third embodiment;

[0044] Figure 4E Drawing according to Figure 4A Another image diagram captured by the electronic device in the third embodiment; and

[0045] Figure 5 A schematic diagram of an electronic device according to the fourth embodiment of this disclosure is shown.

[0046] [Symbol Explanation]

[0047] 100, 200: Imaging lens

[0048] 101,201: Lens tube

[0049] 102,202: Imaging plane

[0050] 110, 130, 170, 180, 260, 270: Lenses

[0051] 120, 220: First lens

[0052] 121,221: Side view of the first object

[0053] 122,222: First image, side view

[0054] 123,1631,223: Anti-reflective coating

[0055] 1231: Intermediary layer

[0056] 1232: Nanostructure layer

[0057] 12321: Ridge-like protrusion

[0058] 140, 150, 210, 240, 250: Third lens

[0059] 160, 230: Second lens

[0060] 161: Second object side view

[0061] 162: Second image, side view

[0062] 40, 50: Electronic devices

[0063] 501: Flash module

[0064] 41: High-resolution camera module

[0065] 42, 51, 52: Ultra-wide-angle camera module

[0066] 43, 44, 55, 56, 57, 58: Telephoto camera module

[0067] 45: Imaging signal processing element

[0068] 46: User Interface

[0069] 53, 54: Wide-angle camera module

[0070] 59: TOF Module

[0071] D: The distance between the first object-side surface and the first image-side surface near the optical axis.

[0072] H: Vertical height

[0073] X: Optical axis Detailed Implementation

[0074] The present disclosure provides an imaging lens having an optical axis, comprising a lens group. The lens group includes a plurality of lenses arranged along the optical axis, and comprises a first lens, a second lens, and at least two anti-reflection films. The first lens includes a first object side surface and a first image side surface, wherein the optical axis passes through the first object side surface, and the first image side surface is disposed opposite to the first object side surface along the direction of the optical axis. The second lens includes a second object side surface and a second image side surface, wherein the optical axis passes through the second object side surface, and the second image side surface is disposed opposite to the second object side surface along the direction of the optical axis. The anti-reflection films are respectively disposed on at least one of the first object side surface and the first image side surface, and on at least one of the second object side surface and the second image side surface. Each anti-reflection film includes a nanostructure layer and an intermediate layer, wherein the intermediate layer is disposed between the nanostructure layer and the at least one surface. The main component of the nanostructure layer is aluminum oxide, which comprises a plurality of non-directionally extending ridge-like protrusions, the ridge-like protrusions extend in a tapering manner from a bottom portion to a top portion, and the average structural height of the ridge-like protrusions is greater than 26 nm and less than 356 nm. The reflectance of each anti-reflection film corresponding to a wavelength of 400 nm to 680 nm can be divided into two wavebands, which are sequentially divided into a first waveband and a second waveband from short wavelength to long wavelength. The first waveband ranges from 400 nm to 470 nm, the minimum reflectance in the first waveband is a first reference value which is RV1, the second waveband ranges from 480 nm to 580 nm, and the maximum reflectance in the second waveband is a second reference value which is RV2, which satisfies the following conditions: 0% < RV1 < 0.1%; and 0.1% < RV2 < 1%. Thereby, the ridge-like protrusions facilitate the formation of a gradient refractive index, which can provide better low reflectance performance for light of different wavelengths and different light incident angles, and disposing at least two lenses with anti-reflection films in the imaging lens helps to improve the phenomenon of light source halation. Furthermore, when the reflectance of the anti-reflection film satisfies the conditions, it helps to improve the problem of light source halation. In addition, disposing a nanostructure layer with a lower average structural height helps to improve production efficiency.

[0075] Specifically, the main component of the intermediate layer may include SiO₂, which helps to improve the connection stability of the nanostructure layer, wherein the main component refers to the component with the highest weight percentage. Since lenses using conventional anti-reflection films are prone to excessive halation stray light near the light source, the reflectance of the anti-reflection film can be adjusted by adjusting parameters such as the average structural height of the nanostructure layer provided by the present disclosure or the composition and thickness of the intermediate layer. It should be noted that the number and positions of the lenses provided with the anti-reflection films need to be determined according to actual tests, and are not limited by the present disclosure. In addition, the surface of the nanostructure layer may have a plurality of pores, which can make the equivalent refractive index variation of the nanostructure layer more linear.

[0076] The average reflectance of the second waveband is RA2, which satisfies the following condition: 0.5% < RA2 < 0.9%. The relatively high reflectance of the second waveband helps improve stray light that causes excessive halation near the light source.

[0077] The second reference value is RV2, which satisfies the following condition: 0.5% < RV2 < 1%. This can be used as the configuration of a type B anti-reflection film, helping to further reduce halation stray light near the light source. It is particularly noted that in the present disclosure, an anti-reflection film satisfying 0% < RV1 < 0.1%, 0.1% < RV2 < 1%, 0.5% < RA2 < 0.9% and 0.5% < RV2 < 1% is defined as the type B anti-reflection film.

[0078] The average reflectance of the second waveband is RA2, which satisfies the following condition: 0.1% < RA2 < 0.35%. Accordingly, the relatively low reflectance of the second waveband helps improve the transmittance of the imaging lens.

[0079] The second reference value is RV2, which satisfies the following condition: 0.15% < RV2 < 0.5%. This helps reduce surface reflection of the lens.

[0080] For the reflectance of each anti-reflection film at a wavelength of 400 nm to 680 nm, a third waveband is further distinguished. The third waveband ranges from 600 nm to 680 nm, and the minimum reflectance in the third waveband is a third reference value, which is RV3 and satisfies the following condition: 0% < RV3 < 0.1%. Accordingly, further regulating the reflectance of the third waveband helps reduce the generation of stray light in the red light band.

[0081] The average reflectance of the first waveband is RA1, which satisfies the following condition: 0% < RA1 < 0.2%. This helps increase the transmittance of the blue light band.

[0082] The average reflectance of the third waveband is RA3, which satisfies the following condition: 0% < RA3 < 0.1%. This can be used as the configuration of a type A anti-reflection film, helping to improve the transmittance of the red light band. It is particularly noted that in the present disclosure, an anti-reflection film satisfying 0% < RV1 < 0.1%, 0.1% < RV2 < 1%, 0.1% < RA2 < 0.35%, 0.15% < RV2 < 0.5%, 0% < RV3 < 0.1%, 0% < RA1 < 0.2% and 0% < RA3 < 0.1% is defined as the type A anti-reflection film.

[0083] The spacing between the first object side surface and the first image side surface adjacent to the optical axis is D, which satisfies the following condition: 0.1 mm < D ≤ 0.42%. Accordingly, the imaging lens can obtain a better improvement effect on light source halation.

[0084] The imaging lens may further include a third lens, which has a third object-side surface and a third image-side surface. The optical axis passes through the third object-side surface. The third image-side surface is arranged opposite to the third object-side surface along the direction of the optical axis. The number of the anti-reflection films is at least three, and one of the at least three anti-reflection films is disposed on at least one of the third object-side surface and the third image-side surface of the third lens. For the anti-reflection film disposed on the third lens, the reflectance corresponding to the wavelength of 400 nm to 680 nm further distinguishes a third waveband, the third waveband ranges from 600 nm to 680 nm, the minimum reflectance in the third waveband is a third reference value, the third reference value is RV3, which satisfies the following condition: 0% < RV3 < 0.1%. Accordingly, the third lens uses the Type A anti-reflection film with low reflectance in the third waveband, which helps compensate for the first lens and the second lens using the Type B anti-reflection film, and improves the transmittance of the imaging lens; that is, it can be regarded as a mixed use of Type A and Type B anti-reflection films.

[0085] The average reflectance of each anti-reflection film corresponding to the wavelength of 400 nm to 680 nm is Ravg, which satisfies the following condition: 0% < Ravg < 0.6%. Accordingly, it helps the lens to have good transmittance.

[0086] The first reference value is RV1, and the second reference value is RV2, which satisfy the following condition: 5 < RV2 / RV1 < 70. Accordingly, it helps to maintain low reflectance while improving light source halo stray light.

[0087] The number of the lenses in the lens group is at least seven. Although an imaging lens with a large number of lenses helps to improve imaging performance, it is prone to the light source halo phenomenon. Therefore, the combined use of the anti-reflection films in the present disclosure helps the imaging lens with a large number of lenses to improve the stray light of light source halo.

[0088] The top of the intermediate layer may be partially covered by the nanostructure layer. Accordingly, it helps to adjust the gradient refractive index of the anti-reflection film. It is additionally noted that in the present disclosure, the intermediate layer may also be a multilayer structure, and through the alternate stacking of high and low refractive index thin films, thin film interference can be formed, which helps to further regulate the first reference value to the third reference value.

[0089] The average structural height of the ridge-shaped protrusions is greater than 41 nm and less than 236 nm. Accordingly, it helps to improve the production efficiency of the anti-reflection film.

[0090] In the lens group, the number of lenses provided with the anti-reflection films accounts for at least 40% of the total number of lenses. Accordingly, it helps to improve the light source halo phenomenon of the imaging lens.

[0091] The present disclosure provides an imaging lens, which has an optical axis and includes a lens group. The lens group includes a plurality of lenses arranged along the optical axis, and comprises a first lens and at least one anti-reflective film. The first lens includes a first object-side surface and a first image-side surface. The optical axis passes through the first object-side surface. The first image-side surface is disposed opposite to the first object-side surface along the direction of the optical axis. The anti-reflective film is disposed on at least one of the first object-side surface and the first image-side surface. Each anti-reflective film includes a nanostructure layer and an intermediate layer. The main component of the nanostructure layer is aluminum oxide, which includes a plurality of non-directionally extending ridge protrusions that taper from a bottom portion to a top portion. The average structural height of the ridge protrusions is greater than 26 nm and less than 356 nm. The intermediate layer is disposed between the nanostructure layer and the aforesaid surface. The distance between the first object-side surface and the first image-side surface adjacent to the optical axis is D, which satisfies the following condition: 0.1 mm < D ≤ 0.42 mm. The reflectivity of the anti-reflective film for wavelengths from 400 nm to 680 nm can be divided into two wavelength bands, which are sequentially defined as a first wavelength band and a second wavelength band from shorter to longer wavelengths. The first wavelength band ranges from 400 nm to 470 nm, and the minimum reflectivity value in the first wavelength band is a first reference value denoted as RV1. The second wavelength band ranges from 480 nm to 580 nm, and the maximum reflectivity value in the second wavelength band is a second reference value denoted as RV2, which satisfies the following conditions: 0% < RV1 < 0.1%; and 0.5% < RV2 < 1%. Thereby, the ridge protrusions facilitate the formation of a gradient refractive index, which can provide better low reflectivity performance for light of different wavelengths and different light incident angles. Furthermore, when the reflectivity of the anti-reflective film meets the conditions, it helps to improve the problem of light source halation. In addition, the imaging lens can obtain a better improvement effect on light source rendering.

[0092] The distance between the first object-side surface and the first image-side surface adjacent to the optical axis is D, which can satisfy the following condition: 0.15 mm < D ≤ 0.375 mm.

[0093] The average reflectivity of the second wavelength band is RA2, which satisfies the following condition: 0.5% < RA2 < 0.9%. Thereby, the relatively higher reflectivity of the second wavelength band helps to improve stray light that causes excessive halation near the light source.

[0094] The average reflectivity of the first wavelength band is RA1, which satisfies the following condition: 0% < RA1 < 0.2%. Thereby, it helps to increase the transmittance of the blue light wavelength band.

[0095] The average reflectivity of the anti-reflective film for wavelengths from 400 nm to 680 nm is Ravg, which satisfies the following condition: 0% < Ravg < 0.6%. Thereby, it helps the lens to have good transmittance.

[0096] The first reference value is RV1, and the second reference value is RV2, which satisfy the following condition: 5<RV2 / RV1<70. Accordingly, it is beneficial to maintain a low reflectance while improving the stray light caused by light source halo.

[0097] The number of the lenses in the lens group is at least seven. Although an imaging lens with a large number of lenses helps to improve imaging performance, it is prone to light source halo phenomenon. Therefore, the use of the anti-reflection film in the present disclosure helps the imaging lens with a large number of lenses to improve the stray light caused by light source halo.

[0098] The top of the intermediate layer may be partially covered by the nanostructure layer. Accordingly, it is beneficial to adjust the gradient refractive index of the anti-reflection film.

[0099] The average structural height of the ridge-like protrusions is greater than 41 nm and less than 236 nm. Accordingly, it is beneficial to improve the production efficiency of the anti-reflection film.

[0100] The present disclosure provides an electronic device including any one of the aforementioned imaging lenses.

[0101] <First Embodiment>

[0102] Please refer to Figure 1A , which schematically shows the imaging lens 100 according to the first embodiment of the present disclosure. It can be seen from Figure 1A that the imaging lens 100 has an optical axis X, and includes a lens group (not otherwise labeled), a lens barrel 101, and an imaging surface 102. The lens group is disposed in the lens barrel 101 along the optical axis X, and the imaging surface 102 is disposed on the image side of the lens barrel 101 and the lens group along the optical axis X. The lens group includes eight lenses and a plurality of anti-reflection films (at least labeled in Figure 1B and Figure 1C ), which are, in order from the object side to the image side along the optical axis X, a lens 110, a first lens 120, a lens 130, two third lenses 140 and 150, a second lens 160, a lens 170, and a lens 180. The first lens 120, the third lenses 140 and 150, and the second lens 160 are respectively provided with the anti-reflection film of the present disclosure, while the remaining lenses 110, 130, 170, and 180 are not provided with an anti-reflection film. The following content will describe in detail the first lens 120, the third lenses 140 and 150, and the second lens 160 which are provided with the anti-reflection film.

[0103] Please refer to in conjunction with Figure 1B , which schematically shows the first lens 120 according to Figure 1A the first embodiment. Figure 1BIt is known that the first lens 120 includes a first object-side surface 121 and a first image-side surface 122, wherein the optical axis X passes through the first object-side surface 121, and the first image-side surface 122 is disposed opposite to the first object-side surface 121 along the direction of the optical axis X. An anti-reflective film 123 is disposed on the first object-side surface 121 of the first lens 120, and includes a nanostructure layer 1232 and an intermediate layer 1231, wherein the intermediate layer 1231 is disposed between the nanostructure layer 1232 and the first object-side surface 121. The main component of the nanostructure layer 1232 is aluminum oxide, and it includes multiple non-directionally extending ridge-like protrusions 12321, which gradually taper from a bottom to a top. The average height of the ridge-like protrusions 12321 is greater than 26 nm and less than 356 nm. Specifically, the height of the ridge protrusion 12321 can be the vertical height H from the absolute bottom (foot portion) of the ridge protrusion 12321 to the top (summit portion) of the ridge protrusion 12321 when viewed in cross-section (destructive measurement) (indicated by the vertical height H). Figure 1B The height of each ridge protrusion 12321 may be different. At least three or more ridge protrusions 12321 can be used to calculate the average height of the structure, with priority given to ridge protrusions 12321 whose outlines can be identified.

[0104] Furthermore, the distance between the first object side 121 and the first image side 122 on the adjacent optical axis X is D, where D = 0.353 mm.

[0105] Please refer to the following: Figure 1C Its drawing is based on Figure 1A A schematic diagram of the second lens 160 in the first embodiment. (From...) Figure 1C It is understood that the second lens 160 includes a second object-side surface 161 and a second image-side surface 162, wherein the optical axis X passes through the second object-side surface 161, and the second image-side surface 162 is disposed opposite to the second object-side surface 161 along the direction of the optical axis X. Two anti-reflective films 1631 are respectively disposed on the second object-side surface 161 and the second image-side surface 162 of the second lens 160. It must be noted that the structure and material of the anti-reflective film 1631 are the same as or similar to those of the anti-reflective film 123 disposed on the first lens 120, and will not be described again here.

[0106] Additionally, the third lenses 140 and 150 may each include a third object-side surface (not shown) and a third image-side surface (not shown), wherein the optical axis X passes through the third object-side surface, and the third image-side surface is disposed opposite to the third object-side surface along the direction of the optical axis X. Both the third object-side surface and the third image-side surface of the third lenses 140 and 150 are provided with an anti-reflective coating (not shown), which may be the same as or similar to the anti-reflective coating 123 of the first lens 120 or the anti-reflective coating 1631 of the second lens 160, and will not be described in detail here.

[0107] <Second Implementation Method>

[0108] Please refer to Figure 2A The diagram illustrates the imaging lens 200 according to the second embodiment of this disclosure. Figure 2A As can be seen, the imaging lens 200 has an optical axis X and includes a lens group (unlabeled), a lens barrel 201, and an imaging surface 202. The lens group is disposed along the optical axis X in the lens barrel 201, and the imaging surface 202 is disposed along the optical axis X on the image side of the lens barrel 201 and the lens group. The lens group includes seven lenses and multiple anti-reflective coatings (at least indicated on...). Figure 2B Along the optical axis X, from the object side to the image side, are, in sequence, a third lens 210, a first lens 220, a second lens 230, two third lenses 240, 250, a lens 260, and a lens 270. Among them, the first lens 220, the second lens 230, and the third lenses 210, 240, and 250 are respectively provided with the anti-reflective coating disclosed herein, while the remaining lenses 260 and 270 do not have anti-reflective coatings. The following content will provide a detailed explanation of the first lens 220, the second lens 230, and the third lenses 210, 240, and 250 which are provided with anti-reflective coatings.

[0109] Please refer to the following: Figure 2B Its drawing is based on Figure 2A A schematic diagram of the first lens 220 in the second embodiment. (From...) Figure 2B As can be seen, the first lens 220 includes a first object-side surface 221 and a first image-side surface 222, wherein the optical axis X passes through the first object-side surface 221, and the first image-side surface 222 is disposed opposite to the first object-side surface 221 along the direction of the optical axis X. An anti-reflective film 223 is disposed on the first object-side surface 221 and the first image-side surface 222 of the first lens 220. The anti-reflective film 223 includes a nanostructure layer (not shown separately) and an intermediate layer (not shown separately), wherein the intermediate layer is disposed between the nanostructure layer and the first object-side surface 221. The main component of the nanostructure layer is aluminum oxide, which includes multiple non-directionally extending ridge-like protrusions (not shown separately), and the ridge-like protrusions gradually taper from a bottom to a top, with an average structural height greater than 26 nm and less than 356 nm. In the second embodiment, details of the nanostructure layer, the intermediate layer, and the ridge-like protrusions can be found in the description and figures of the first embodiment above, and will not be repeated here.

[0110] Furthermore, the distance between the first object side 221 and the first image side 222 on the adjacent optical axis X is D, where D = 0.333 mm.

[0111] In addition, the second object-side surface (not shown) and the second image-side surface (not shown) of the second lens 230 may both be provided with anti-reflective coatings (not shown), the third object-side surface (not shown) and the third image-side surface (not shown) of the third lenses 240 and 250 may both be provided with anti-reflective coatings (not shown), and the third image-side surface (not shown) of the third lens 210 may be provided with an anti-reflective coating (not shown). The anti-reflective coatings thereon may be the same as or similar to the anti-reflective coating 223 of the first lens 220, which will not be described in detail here.

[0112] <Example>

[0113] Please refer to the following: Figure 3A , Figure 3B , Figure 3C , Figure 3D as well as Figure 3E Schematic diagrams illustrating the reflectivity (%)-wavelength (nm) of the antireflective film coated on the test lens according to the first to twentieth embodiments (denoted as sample 1 to sample 20) provided in accordance with this disclosure. Specifically, Figure 3A This diagram illustrates the reflectivity (%) and wavelength (nm) of the antireflective film deposited on the test lens in the first embodiment (sample 1), the second embodiment (sample 2), the third embodiment (sample 3), and the fourth embodiment (sample 4). Figure 3B Schematic diagrams showing the reflectivity (%) and wavelength (nm) of the antireflective film deposited on the test lens in the fifth embodiment (sample 5), the sixth embodiment (sample 6), the seventh embodiment (sample 7), and the eighth embodiment (sample 8). Figure 3C Schematic diagrams showing the reflectivity (%) and wavelength (nm) of the antireflective film deposited on the test lens in the ninth embodiment (sample 9), tenth embodiment (sample 10), eleventh embodiment (sample 11), and twelfth embodiment (sample 12). Figure 3D This diagram illustrates the reflectivity (%) as a function of wavelength (nm) of the antireflective film deposited on the test lens in the thirteenth (sample 13), fourteenth (sample 14), fifteenth (sample 15), and sixteenth (sample 16) embodiments. Figure 3EThis document discloses schematic diagrams showing the reflectivity (%) and wavelength (nm) of the antireflective films coated on the test lenses in the seventeenth embodiment (sample 17), the eighteenth embodiment (sample 18), the nineteenth embodiment (sample 19), and the twentieth embodiment (sample 20). In this disclosure, samples 1-4 are classified as type B antireflective films, and samples 5-20 are classified as type A antireflective films.

[0114] Tables 1A-1E below are Figure 3A , Figure 3B , Figure 3C , Figure 3D as well as Figure 3E The relevant data for samples 1-20 are as follows. Specifically, the reflectivity of the antireflective film corresponding to wavelengths from 400nm to 680nm can be divided into three bands, ordered from shortest to longest: a first band, a second band, and a third band. The first band is between 400nm and 470nm, and the minimum reflectivity in the first band is a first reference value, RV1. The second band is between 480nm and 580nm, and the maximum reflectivity in the second band is a second reference value, RV2. The third band is between 600nm and 680nm, and the minimum reflectivity in the third band is a third reference value, RV3. The average reflectivity of the first band is RA1, the average reflectivity of the second band is RA2, and the average reflectivity of the third band is RA3. The average reflectivity of the antireflective film corresponding to wavelengths from 400nm to 680nm is Ravg.

[0115]

[0116]

[0117]

[0118]

[0119]

[0120]

[0121]

[0122] The aforementioned first to twentieth embodiments can be applied to any of the antireflective films in the aforementioned first and second embodiments as needed, but the content of this disclosure is not limited thereto.

[0123] <Third Implementation Method>

[0124] Please refer toFigure 4A and Figure 4B ,in Figure 4A A schematic diagram of the electronic device 40 according to the third embodiment of this disclosure is shown. Figure 4B Drawing according to Figure 4A Another schematic diagram of the electronic device 40 in the third embodiment. (From...) Figure 4A and Figure 4B As can be seen, the electronic device 40 is a smartphone. The electronic device 40 includes multiple camera modules and a user interface 46. Each camera module may include an imaging lens of any of the aforementioned first to second embodiments, but the present disclosure is not limited thereto. Furthermore, the camera modules are a high-pixel camera module 41, an ultra-wide-angle camera module 42, and dual telephoto camera modules 43 and 44, and the user interface 46 is a touch screen, but is not limited thereto.

[0125] The user enters the shooting mode through the user interface 46, which displays the screen and allows manual adjustment of the shooting angle to switch between different camera modules. At this time, the camera module focuses the imaging light onto the electronic image sensor and outputs electronic signals related to the image to the image signal processor (ISP) 45.

[0126] Depend on Figure 4A As can be seen, depending on the camera specifications of the electronic device 40, the electronic device 40 may also include an optical image stabilization component (not shown in the figure). Furthermore, the electronic device 40 may also include at least one focus assist module (not shown in the figure) and at least one sensing element (not shown in the figure). The focus assist module may be a color temperature compensated flash module, an infrared rangefinder, a laser focus module, etc. The sensing element may have the function of sensing physical momentum and kinetic energy, such as an accelerometer, a gyroscope, or a Hall effect element, to sense the shaking and tremors caused by the user's hand or the external environment. This is beneficial to the autofocus function and optical image stabilization component configured in the camera module of the electronic device 40, so as to obtain good image quality and help the electronic device 40 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 (4K Resolution) video recording. In addition, users can directly view the camera's shooting screen through the user interface 46 and manually operate the framing range on the user interface 46 to achieve the WYSIWYG autofocus function.

[0127] Furthermore, the camera module, optical image stabilization component, sensing element, and focus assist module can be mounted on a flexible printed circuit board (FPC) (not shown), and electrically connected to the imaging signal processing element 45 and other related components via a connector (not shown) to execute the shooting process. Current electronic devices, such as smartphones, tend to be thinner and lighter. By mounting the camera module and related components on a flexible printed circuit board and then using a connector to integrate the circuitry onto the mainboard of the electronic device, the design and circuit layout requirements within the limited space of the electronic device can be met, providing greater flexibility. This also allows for more flexible control of the camera module's autofocus function through the electronic device's touchscreen. In the third embodiment, the electronic device 40 may include multiple sensing elements and multiple focus assist modules. The sensing elements and focus assist modules are mounted on a flexible printed circuit board and at least one other flexible printed circuit board (not shown), and electrically connected to the imaging signal processing element 45 and other related components via corresponding connectors to execute the shooting process. In other embodiments (not shown), the sensing element and auxiliary optical element may also be mounted on the motherboard of the electronic device or other types of carrier boards, depending on the mechanical design and circuit layout requirements.

[0128] Furthermore, the electronic device 40 may further include, but is not limited to, a display unit, a control unit, a storage unit, random access memory (RAM), read-only memory (ROM), or a combination thereof.

[0129] Figure 4C Drawing according to Figure 4A A schematic diagram of an image captured by the electronic device 40 in the third embodiment. Figure 4C It can be seen that the ultra-wide-angle camera module 42 can capture images of a larger range and has the function of capturing more scenery.

[0130] Figure 4D Drawing according to Figure 4A Another image diagram captured by the electronic device 40 in the third embodiment. (From...) Figure 4D It can be seen that the high-pixel camera module 41 can capture images within a certain range and also has high pixel count, with high resolution and low distortion.

[0131] Figure 4E Drawing according to Figure 4A Another image diagram captured by the electronic device 40 in the third embodiment. (From...) Figure 4E It can be seen that the telephoto camera modules 43 and 44 have high magnification functions, which can capture distant images and magnify them to a high degree.

[0132] Depend on Figures 4C-4EIt can be seen that by using camera modules with different focal lengths for framing and combining them with image processing technology, the electronic device 40 can achieve the function of zooming.

[0133] <Fourth Implementation>

[0134] Please refer to Figure 5 The diagram illustrates the electronic device 50 according to the fourth embodiment of this disclosure. Figure 5 As can be seen, the electronic device 50 is a smartphone, and the electronic device 50 includes multiple camera modules, wherein each camera module may include an imaging lens of any of the aforementioned first to second embodiments, but the present disclosure is not limited thereto. Furthermore, the camera modules are ultra-wide-angle camera modules 51, 52, wide-angle camera modules 53, 54, telephoto camera modules 55, 56, 57, 58 and TOF module (Time-Of-Flight) 59, and the TOF module 59 may also be other types of camera modules, and is not limited to this configuration.

[0135] Furthermore, telephoto camera modules 57 and 58 also have the function of reversing the optical path, but this disclosure is not limited to this.

[0136] Depending on the camera specifications of the electronic device 50, the electronic device 50 may also include an optical image stabilization component (not shown). Furthermore, the electronic device 50 may also include at least one focus assist module (not shown) and at least one sensing element (not shown). The focus assist module may be a color temperature-compensating flash module 501, an infrared rangefinder, a laser focus module, etc. The sensing element 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 configured in the camera module of the electronic device 50, resulting in good image quality. This helps the electronic device 50 according to this disclosure to have multiple shooting modes, such as optimized Selfie, low-light HDR (High Dynamic Range) imaging, and high-resolution 4K video recording.

[0137] Furthermore, the structure and arrangement of the remaining components in the fourth embodiment are the same as those in the third embodiment, and will not be described again here.

[0138] Although the present disclosure has been presented above with reference to embodiments, it is not intended to limit the scope of the present disclosure. Anyone skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.

Claims

1. An imaging lens, characterized in that, having an optical axis, comprising: a lens group, comprising a plurality of lenses, the plurality of lenses being disposed along the optical axis, and comprising: a first lens, comprising: a first object side, through which the optical axis passes; and a first image side, disposed opposite to the first object side along the direction of the optical axis; a second lens, comprising: a second object side, through which the optical axis passes; and a second image side, disposed opposite to the second object side along the direction of the optical axis; and at least two anti-reflection films, respectively disposed on at least one of the first object side and the first image side, and at least one of the second object side and the second image side, each of the anti-reflection films comprising: a nanostructure layer, comprising a plurality of non-directionally extending ridge protrusions, the plurality of ridge protrusions tapering and extending from a bottom to a top, and the average structural height of the plurality of ridge protrusions being greater than 26 nm and less than 356 nm; and an intermediate layer, disposed between the nanostructure layer and the at least one side; wherein the reflectance of each of the anti-reflection films for wavelengths from 400 nm to 680 nm can be divided into two wavebands, the wavelengths are sequentially divided into a first waveband and a second waveband from short to long, the first waveband ranges from 400 nm to 470 nm, the minimum reflectance in the first waveband is a first reference value which is RV1, the second waveband ranges from 480 nm to 580 nm, the maximum reflectance in the second waveband is a second reference value which is RV2, and the following conditions are satisfied: 0%<RV1<0.1%; and 0.1%<RV2<1%.

2. The imaging lens as described in claim 1, characterized in that, The average reflectance of the second waveband is RA2, which satisfies the following condition: 0.5%<RA2<0.9%.

3. The imaging lens as described in claim 2, characterized in that, The second reference value is RV2, which satisfies the following condition: 0.5%<RV2<1%.

4. The imaging lens as described in claim 1, characterized in that, The average reflectance of the second waveband is RA2, which satisfies the following condition: 0.1%<RA2<0.35%.

5. The imaging lens as described in claim 4, characterized in that, The second reference value is RV2, which satisfies the following condition: 0.15%<RV2<0.5%.

6. The imaging lens as described in claim 5, characterized in that, The reflectance of each of the anti-reflection films corresponding to the wavelengths from 400 nm to 680 nm is further divided into a third waveband, the third waveband ranges from 600 nm to 680 nm, the minimum reflectance in the third waveband is a third reference value which is RV3, and the following condition is satisfied: 0%<RV3<0.1%.

7. The imaging lens as described in claim 6, characterized in that, The average reflectance of the first waveband is RA1, which satisfies the following condition: 0%<RA1<0.2%.

8. The imaging lens as described in claim 6, characterized in that, The average reflectance of the third waveband is RA3, which satisfies the following condition: 0%<RA3<0.1%.

9. The imaging lens as described in claim 1, characterized in that, The distance between the first object side and the first image side adjacent to the optical axis is D, which satisfies the following condition: 0.1mm<D≤0.42mm.

10. The imaging lens as described in claim 1, characterized in that, further comprising: a third lens, comprising: a third object side, through which the optical axis passes; and a third image side, disposed opposite to the third object side along the direction of the optical axis; wherein the number of the at least two anti-reflective films is at least three, and one of the at least three anti-reflective films is disposed on at least one of the third object side and the third image side of the third lens; wherein the reflectance of the anti-reflective film disposed on the third lens for a wavelength of 400 nm to 680 nm is further divided into a third waveband, the third waveband ranges from 600 nm to 680 nm, the minimum reflectance in the third waveband is a third reference value, the third reference value is RV3, which satisfies the following condition: 0%<RV3<0.1%.

11. The imaging lens as described in claim 1, characterized in that, The average reflectance of each of the anti-reflective films for the wavelength of 400 nm to 680 nm is Ravg, which satisfies the following condition: 0%<Ravg<0.6%.

12. The imaging lens as described in claim 1, characterized in that, The first reference value is RV1, and the second reference value is RV2, which satisfy the following condition: 5<RV2 / RV1<70.

13. The imaging lens as described in claim 1, characterized in that, The number of the plurality of lenses in the lens group is at least seven.

14. The imaging lens as described in claim 1, characterized in that, The top of the intermediate layer is partially covered by the nanostructure layer.

15. The imaging lens as described in claim 1, characterized in that, The average structural height of the plurality of ridge-shaped protrusions is greater than 41 nm and less than 236 nm.

16. The imaging lens as described in claim 1, characterized in that, In the lens group, the number of lenses provided with the at least two anti-reflective films accounts for at least 40% of the total number of lenses.

17. An imaging lens, characterized in that, Having an optical axis, comprising: A lens group, comprising a plurality of lenses, the plurality of lenses being disposed along the optical axis, and comprising: A first lens, comprising: A first object side, through which the optical axis passes; and A first image side, disposed opposite to the first object side along the direction of the optical axis; and At least one anti-reflective film, disposed on at least one of the first object side and the first image side, each of the at least one anti-reflective film comprising: A nanostructure layer, comprising a plurality of non-directionally extending ridge-shaped protrusions, wherein the plurality of ridge-shaped protrusions extend tapering from a bottom to a top, and the average structural height of the plurality of ridge-shaped protrusions is greater than 26 nm and less than 356 nm; and An intermediate layer, disposed between the nanostructure layer and the at least one surface; wherein the distance between the first object side and the first image side adjacent to the optical axis is D, which satisfies the following condition: 0.1mm<D≤0.42mm; wherein the reflectance of the at least one anti-reflective film for a wavelength of 400 nm to 680 nm can be divided into two wavebands, the wavelengths are sequentially divided into a first waveband and a second waveband from short to long, the first waveband ranges from 400 nm to 470 nm, the minimum reflectance in the first waveband is a first reference value, the first reference value is RV1, the second waveband ranges from 480 nm to 580 nm, the maximum reflectance in the second waveband is a second reference value, and the second reference value is RV2, which satisfies the following condition: 0%<RV1<0.1%; and 0.5%<RV2<1%.

18. The imaging lens as described in claim 17, characterized in that, The distance between the first object side and the first image side adjacent to the optical axis is D, which satisfies the following condition: 0.15mm<D≤0.375mm.

19. The imaging lens as described in claim 17, characterized in that, The average reflectance of the second waveband is RA2, which satisfies the following condition: 0.5%<RA2<0.9%.

20. The imaging lens as described in claim 19, characterized in that, The average reflectance of the first waveband is RA1, which satisfies the following condition: 0%<RA1<0.2%.

21. The imaging lens as described in claim 17, characterized in that, The at least one antireflective film has an average reflectance of Ravg for the wavelength range of 400 nm to 680 nm, which satisfies the following condition: 0% <Ravg<0.6%。 22. The imaging lens as described in claim 17, characterized in that, The first reference value is RV1, and the second reference value is RV2, which satisfy the following conditions: 5 <RV2 / RV1<70。 23. The imaging lens as described in claim 17, characterized in that, The number of lenses in the lens group is at least seven.

24. The imaging lens as described in claim 17, characterized in that, The top of the intermediary layer is partially covered by a nanostructure layer.

25. The imaging lens as described in claim 17, characterized in that, The average height of the multiple ridge-like protrusions is greater than 41 nm and less than 236 nm.

26. An electronic device, characterized in that, Include: The imaging lens as described in claim 1 or 17.

Images