Optical lens assembly and optical module

Abstract

An optical lens assembly and an optical module, an optical axis passing through the optical lens assembly, and the optical lens assembly comprising a glass lens. The glass lens has an optical surface which is non-planar, an anti-reflection coating layer is formed on the optical surface, and the anti-reflection coating layer comprises a nano-structure layer and a structure connecting layer. The nano-structure layer has a plurality of ridge-shaped protrusions extending from the optical surface in a non-directional manner. The structure connecting layer is disposed between the optical surface and the nano-structure layer, and the structure connecting layer comprises at least one silicon dioxide film layer, the silicon dioxide film layer is in contact with a bottom solid of the nano-structure layer, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. Through the configuration of the glass lens, the optical lens assembly can maintain the imaging quality under cold and hot impact.

Description

Technical Field

[0001] This disclosure relates to an optical lens assembly and optical module, and more particularly to an optical lens assembly and optical module having an anti-reflective coating. Background Technology

[0002] In recent years, optical modules have developed rapidly and have become ubiquitous in modern life, widely used in various fields such as portable electronic devices, head-mounted displays, and vehicle tools. As a result, the optical module industry has flourished. However, with increasing technological advancements, users have higher and higher quality requirements for optical modules, with anti-reflective coatings being one of the main factors affecting image quality. However, the significant difference in thermal expansion coefficients between conventional anti-reflective coatings and the substrate causes relative displacement at the interface due to temperature changes, easily leading to coating peeling or damage, thus affecting image quality. Therefore, an optical module that can resist temperature changes and maintain image quality remains a common goal for related industries. Summary of the Invention

[0003] The optical lens assembly and optical module disclosed herein, by configuring a glass lens with a low coefficient of thermal expansion and by setting an anti-reflective coating on the glass lens, can reduce the relative displacement between the anti-reflective coating and the glass lens interface after temperature changes, avoid problems such as coating thickness changes, coating peeling or coating cracking, and enable the optical lens assembly to maintain imaging quality under thermal shock.

[0004] According to one embodiment of this disclosure, an optical lens assembly is provided, with an optical axis passing through the optical lens assembly, and the optical lens assembly includes a glass lens. The glass lens has refractive power, and one optical surface of the glass lens is non-planar. An anti-reflective film layer is formed on the optical surface, and the anti-reflective film layer includes a nanostructure layer and a structural connection layer. The nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and the material of the nanostructure layer includes alumina. The structural connection layer is disposed between the optical surface and the nanostructure layer, and the structural connection layer includes at least one silicon dioxide film layer, which is in solid contact with a bottom of the nanostructure layer, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens operates in a temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 12 × 10 -7 / K < α1 < 210×10 -7 / K. The nanostructured layer has pores, and the portion of the nanostructured layer with pores is the nanostructured layer thickness t = 0 nm. The structural connecting layer corresponding to the portion of the nanostructured layer with pores is exposed to air.

[0005] According to the optical lens group of the embodiment described above, the ridge protrusion has a shape that is wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

[0006] According to the optical lens assembly of the embodiment described above, the distance along the optical axis from a first side surface to a second side surface in the optical lens assembly is D. S1SL The distance along the optical axis from the optical surface to the second side surface is D. SoSL It satisfies the following condition: 0.12 ≤ D SoSL / D S1SL < 0.985.

[0007] According to the optical lens assembly of the embodiment described above, the maximum reflectivity of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It can satisfy the following condition: 0% ≤ R abs ≤ 1.0%.

[0008] According to the optical lens group of the embodiment described above, the average reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It can satisfy the following condition: 0% ≤ R avg ≤ 0.5%.

[0009] According to the optical lens assembly of the embodiment described above, the glass lens is in the temperature range of -30°C. o C to 70 o C, with a first average linear expansion coefficient α1, and the structural connection layer operates within a temperature range of -30°C. o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41.

[0010] According to the optical lens assembly of the embodiment described above, the glass lens is in the temperature range of -30°C. o C to 70 o C has a temperature coefficient of relative refractive index dn / dt, which satisfies the following condition: 0.1 × 10 -6 / o C ≤ |dn / dt| ≤ 17×10 -6 / o C.

[0011] The optical lens assembly according to the embodiment described above may have an inflection point on the optical surface.

[0012] According to the optical lens group of the embodiment described above, the distance from an object-side surface of a first-side lens of the optical lens group to an imaging surface along the optical axis is TL, which can satisfy the following condition: 8 mm ≤ TL.

[0013] According to the optical lens group of the embodiment described above, a glass lens may be disposed on the first side of the optical lens group, and the optical lens group may further include a plastic lens disposed along the optical axis at one image-side end of the glass lens.

[0014] The optical lens assembly according to the embodiments described above may further include an adhesive lens.

[0015] The optical lens assembly according to the embodiments described above may further include at least one optical path deflection element disposed at at least one of an object-side end and an image-side end of the optical lens assembly.

[0016] According to one embodiment of this disclosure, an optical module is provided, comprising a light source and an optical lens group. An optical axis passes through the optical lens group, and the optical lens group includes at least three lenses. At least one of the at least three lenses is a glass lens, wherein the glass lens has refractive power and is closer to the light source than at least two other lenses. An optical surface of the glass lens is non-planar, and an anti-reflective film is formed on the optical surface. The anti-reflective film includes a nanostructure layer and a structural connection layer. The nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and the nanostructure layer is made of alumina. The structural connection layer is disposed between the optical surface and the nanostructure layer, and the structural connection layer includes at least one silicon dioxide film layer. The silicon dioxide film layer is in solid contact with a bottom of the nanostructure layer, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens operates in a temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 12 × 10 -7 / K < α1 < 210×10 -7 / K. The nanostructured layer has pores, and the portion of the nanostructured layer with pores is the nanostructured layer thickness t = 0 nm. The structural connecting layer corresponding to the portion of the nanostructured layer with pores is exposed to air.

[0017] According to the optical module of the embodiment described above, the ridge protrusions are wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

[0018] According to the optical module of the embodiment described above, the distance along the optical axis from a first side surface to a second side surface in the optical lens group is D. S1SL The distance along the optical axis from the optical surface to the second side surface is D.SoSL It satisfies the following condition: 0.12 ≤ D SoSL / D S1SL < 0.985.

[0019] In the optical module of the embodiment described above, the glass lens may be an array lens.

[0020] According to the optical module of the embodiment described above, the maximum reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It can satisfy the following condition: 0% ≤ R abs ≤ 1.0%.

[0021] According to the optical module of the embodiment described above, the average reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It can satisfy the following condition: 0% ≤ R avg ≤ 0.5%.

[0022] According to the optical module of the embodiment described above, the glass lens is in the temperature range of -30°C. o C to 70 o C, with a first average linear expansion coefficient α1, and the structural connection layer operates within a temperature range of -30°C. o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41.

[0023] According to the optical module of the embodiment described above, the optical lens group may further include at least one optical path deflection element disposed at at least one of an object-side end and an image-side end of the optical lens group.

[0024] The optical module according to the embodiment described above may have a light source that is an array of multiple display elements.

[0025] According to one embodiment of this disclosure, an optical module is provided, comprising a light source and an optical lens group. An optical axis passes through the optical lens group, and the optical lens group includes at least three lenses. At least one of the at least three lenses is a glass lens, wherein the glass lens has refractive power and is closer to the light source than at least two other lenses. An optical surface of the glass lens is non-planar, and an anti-reflective film is formed on the optical surface. The anti-reflective film includes a nanostructure layer and a structural connection layer. The nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and the nanostructure layer is made of alumina. The structural connection layer is disposed between the optical surface and the nanostructure layer, and the structural connection layer includes at least one silicon dioxide film layer. The silicon dioxide film layer is in solid contact with a bottom of the nanostructure layer, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The maximum effective radius of the optical surface is Y, and the maximum displacement SAG parallel to the optical axis is from the intersection of the optical surface and the optical axis to the position of the maximum effective radius of the optical surface. glass The glass lens is in the temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 0.01 ≤ SAG glass / Y ≤0.99; and 12×10 -7 / K < α1 < 210×10 -7 / K. The nanostructured layer has pores, and the portion of the nanostructured layer with pores is the nanostructured layer thickness t = 0 nm. The structural connecting layer corresponding to the portion of the nanostructured layer with pores is exposed to air.

[0026] According to the optical module of the embodiment described above, the ridge protrusions can be in the shape of being wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

[0027] In the optical module of the embodiment described above, the glass lens may be an array lens.

[0028] According to the optical module of the embodiment described above, the maximum reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It can satisfy the following condition: 0% ≤ R abs ≤ 1.0%.

[0029] According to the optical module of the embodiment described above, the average reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It can satisfy the following condition: 0% ≤ R avg ≤ 0.5%.

[0030] According to the optical module of the embodiment described above, the glass lens is in the temperature range of -30°C. o C to 70 o C, with a first average linear expansion coefficient α1, and the structural connection layer operates within a temperature range of -30°C. o C to 70 o C can have a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41.

[0031] According to the optical module of the embodiment described above, the point where the optical surface intersects the optical axis has a maximum displacement SAG parallel to the optical axis from the position of the maximum effective radius of the optical surface. glass It can satisfy the following condition: 90 μm ≤ SAG glass .

[0032] The optical module according to the embodiment described above may have an inflection point on its optical surface.

[0033] According to the optical module of the embodiment described above, the optical lens group may further include at least one optical path deflection element disposed at at least one of an object-side end and an image-side end of the optical lens group.

[0034] The optical module according to the embodiment described above may have a light source that is an array of multiple display elements. Attached Figure Description

[0035] Figure 1A A schematic diagram of the optical lens group of the optical module according to the first embodiment of this disclosure is shown;

[0036] Figure 1B Drawing according to Figure 1A A schematic diagram of the glass lens in the first embodiment;

[0037] Figure 1C Drawing according to Figure 1B A cross-sectional schematic diagram of the anti-reflection coating on the optical surface of the glass lens in the first embodiment under an electron microscope;

[0038] Figure 1D Drawing according to Figure 1B A schematic diagram of the reflectivity parameters of the glass lens without an anti-reflection coating in the first embodiment;

[0039] Figure 1E Drawing according to Figure 1B A schematic diagram of the reflectivity parameters of the glass lens with an anti-reflection coating in the first embodiment;

[0040] Figure 2 A schematic diagram of the optical lens group of the optical module according to the second embodiment of this disclosure is shown;

[0041] Figure 3 A schematic diagram of the optical lens group of the optical module according to the third embodiment of this disclosure is shown;

[0042] Figure 4 A schematic diagram of the optical lens group of the optical module according to the fourth embodiment of this disclosure is shown;

[0043] Figure 5 A schematic diagram of the optical lens group of the optical module according to the fifth embodiment of this disclosure is shown;

[0044] Figure 6 A schematic diagram of the optical lens group of the optical module according to the sixth embodiment of this disclosure is shown;

[0045] Figure 7A A schematic diagram illustrating a vehicle tool according to the seventh embodiment of this disclosure;

[0046] Figure 7B Drawing according to Figure 7A Top view of the vehicle tool according to the seventh embodiment;

[0047] Figure 7C Drawing according to Figure 7A Another schematic diagram of the vehicle tool in the seventh embodiment;

[0048] Figure 7D Drawing according to Figure 7A A schematic diagram of the interior space of the vehicle tools in the seventh embodiment;

[0049] Figure 8A A schematic diagram illustrating a head-mounted device according to the eighth embodiment of this disclosure;

[0050] Figure 8B A schematic diagram illustrating another aspect of the head-mounted device according to the eighth embodiment of this disclosure;

[0051] Figure 8C Drawing according to Figure 8B Another schematic diagram of the head-mounted device according to the eighth embodiment;

[0052] Figure 8D Drawing according to Figure 8B A schematic diagram of the optical module in the eighth embodiment;

[0053] Figure 8E Drawing according to Figure 8B A schematic diagram illustrating the use of the head-mounted device according to the eighth embodiment; and

[0054] Figure 8F Drawing according to Figure 8B A schematic diagram illustrating another aspect of the use of the head-mounted device according to the eighth embodiment.

[0055] [Symbol Explanation]

[0056] 100, 200, 300, 400, 500, 600, 820: Optical lens groups

[0057] 111,211,311,411: Front cover

[0058] 112,212,312,412: Cylinder body

[0059] 120, 130, 150, 220, 240, 320, 390, 440, 520, 640, 821: Glass lenses

[0060] 121,122,131,132,151,152,221,241,242,321,322,391,441,442,521,522,641,642,8211: Anti-reflective coating layer

[0061] 140, 160, 170, 230, 250, 260, 270, 330, 340, 350, 360, 370, 380, 420, 430, 450, 460, 470, 480, 490, 530, 540, 550, 560, 570, 620, 630, 650, 660, 670: Lenses

[0062] 153,243,323,443,523,643: Optical surfaces

[0063] 1521,2411,3211,4411,5211,6411: Nanostructure layers

[0064] 1522,2412,3212,4412,5212,6412: Structural connection layer

[0065] 510, 610: Lens tube

[0066] 70: Vehicles and Tools

[0067] 71: Optical Module

[0068] 80,800: Headset

[0069] 810: Light source

[0070] 830: Image Transmission Module

[0071] 840: Optical path conversion element

[0072] D S1SL The distance along the optical axis from the first side surface to the second side surface.

[0073] DSoSL Distance along the optical axis from the optical surface to the second side surface

[0074] H1: Structural height of the nanostructure layer

[0075] H2: Thickness of the silicon dioxide film

[0076] L: Imaging ray

[0077] N4R1, N4R2, G4R1, G4R2: Reflectivity

[0078] S1, S2, S3, S4: External space information

[0079] S5: Internal Space Information

[0080] TL: Distance from the object-side surface of the first lens to the imaging plane

[0081] X: Optical axis

[0082] θ: perspective Detailed Implementation

[0083] This disclosure provides an optical module comprising a light source and an optical lens assembly. An optical axis passes through the optical lens assembly, which includes a glass lens. The glass lens has refractive power, and one optical surface of the glass lens is non-planar. An anti-reflective coating is formed on the optical surface, and the anti-reflective coating includes a nanostructure layer and a structural connection layer. The nanostructure layer has multiple ridge-like protrusions extending non-directionally from the optical surface. The nanostructure layer is made of alumina, and the average height of the nanostructure layer is greater than or equal to 80 nm and less than or equal to 350 nm. The structural connection layer is disposed between the optical surface and the nanostructure layer. The structural connection layer includes at least one silicon dioxide film layer, which is in solid contact with a bottom layer of the nanostructure layer. The thickness of the silicon dioxide film layer is greater than or equal to 20 nm and less than or equal to 150 nm. The glass lens operates within a temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 12 × 10 -7 / K < α1 < 210×10 -7 / K. By configuring a glass lens with a low linear expansion coefficient α1, the relative displacement between the anti-reflective coating and the glass lens interface after temperature changes can be reduced, avoiding problems such as coating thickness changes, coating peeling or cracking, thereby improving the stability of the anti-reflective coating on the optical surface under drastic temperature changes, and enabling the optical lens group to maintain imaging quality under thermal shock.

[0084] The optical lens assembly may further include at least three lenses. At least one of the at least three lenses is the aforementioned glass lens, and the glass lens is closer to the light source than the other at least two lenses. When the distance along the optical axis from a first side surface to a second side surface in the optical lens assembly is D... S1SL The distance along the optical axis from the optical surface to the second side surface is D. SoSL It can satisfy the following condition: 0.12 ≤ D SoSL / D S1SL < 0.985. By placing an anti-reflective coating at specific locations within the optical lens assembly, surface reflections of non-imaging rays can be reduced.

[0085] When viewed in cross-section from the optical lens, the ridge-like protrusions can appear as a mountain ridge, wider at the bottom and narrower at the top. This ridge-like structure allows the equivalent refractive index of the nanostructure layer to gradually decrease from the bottom (foot part) to the top (summit part), and can form a rough surface to reduce the reflection of stray light.

[0086] Specifically, the nanostructure layer can have pores, and the distance between adjacent irregular protrusions gradually increases from the optical surface toward the air, so that the equivalent refractive index of the nanostructure layer gradually changes toward 1.00, reducing the refractive index change between the antireflective film layer and the glass lens interface, and reducing the chance of light reflection.

[0087] Furthermore, when the maximum effective radius of the optical surface is Y, the point where the optical surface intersects the optical axis has a maximum displacement SAG parallel to the optical axis from the position of the maximum effective radius of the optical surface. glass It can satisfy the following condition: 0.01 ≤ SAG glass / Y ≤ 0.99. By configuring the optical surface, the anti-reflective coating can be formed on a curved optical surface, thereby increasing design freedom.

[0088] Specifically, the glass lens can be ground glass or molded glass, but this disclosure is not limited thereto. When the thickness of the nanostructure layer is t, and t = 0 nm, the structural bonding layer can be exposed to air.

[0089] The maximum reflectivity of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It can satisfy the following condition: 0% ≤ R abs ≤ 1.0%. The average reflectance of the optical surface of the glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It can satisfy the following condition: 0% ≤ R avg ≤ 0.5%. This maintains low reflectivity and thus avoids stray light reflection.

[0090] Glass lenses in the temperature range of -30°C o C to 70 o C can have a first average linear expansion coefficient α1, and the structural connection layer is in the temperature range of -30°C. o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41. Specifically, the linear expansion coefficient of the alumina crystals in the nanostructure layer can be 40 × 10⁻⁶. -7 / K - 100×10 -7 / K, the linear expansion coefficient of the silica film in the structural bonding layer can be 5.5×10. -7 / K - 7.5×10 -7 / K, the first average linear expansion coefficient α1 of the glass lens can be 40×10. -7 / K - 180×10 -7 / K, but this disclosure is not limited thereto. Compared to the linear expansion coefficient of 600×10 in conventional optical plastic lenses. -7 / K - 700×10 -7 / K, In this disclosure, the linear expansion coefficients of the glass lens and the anti-reflective coating are close, resulting in a small relative displacement between them, which can further improve the stability of the anti-reflective coating on the optical surface.

[0091] Furthermore, the structural connection layer can be a film layer formed by alternating stacks of a high refractive index layer and a low refractive index layer, and the top of the structural connection layer is a silicon dioxide layer, which is in solid contact with the nanostructure layer.

[0092] Glass lenses in the temperature range of -30°C o C to 70 o C can have a temperature coefficient of relative refractive index of dn / dt, which can satisfy the following condition: 0.1×10 -6 / o C ≤ |dn / dt| ≤ 17×10 -6 / o C. In detail, the refractive index of optical glass changes with temperature. The temperature coefficient of refractive index in media such as air is called the relative temperature coefficient of refractive index, and the relative temperature coefficient of refractive index dn / dt is the temperature coefficient of relative refractive index measured at a spectral wavelength of 587.56 nm (d-line). By using glass lenses with a low relative temperature coefficient of refractive index dn / dt, the problem of thermal defocusing in optical lenses can be reduced, allowing the lens to maintain image quality even after being subjected to thermal shock.

[0093] Optical surfaces may have a point of inflection. Specifically, in addition to anti-reflective coatings, optical surfaces may also have anti-fogging layers, anti-scratch layers, light-shielding coatings, etc., and are not limited to these.

[0094] When the distance along the optical axis from the object-side surface of a first-side lens of an optical lens group to an imaging plane is TL, it can satisfy the following condition: 8 mm ≤ TL. By increasing the total length of the optical lens group, lenses with positive and negative refractive forces can be effectively distributed, thereby reducing the occurrence of thermal defocus.

[0095] A glass lens can be disposed on the first side of an optical lens group, and the optical lens group may also include a plastic lens disposed along the optical axis on the image side of the glass lens. Furthermore, the first lens on the first side of the optical lens group is most sensitive to temperature effects. Therefore, when the first lens is a glass lens with a low coefficient of thermal expansion α1 and a low temperature coefficient of relative refractive index dn / dt, the optical lens group can remain stable after temperature changes and maintain the function of the anti-reflective coating (film thickness, adhesion, film integrity, cutoff wavelength). Simultaneously, the optical lens can improve design freedom, increase production efficiency, and reduce production costs by combining it with a plastic lens.

[0096] The optical lens group may also include an adhesive lens. This helps to eliminate chromatic aberration.

[0097] The optical module may further include at least one optical path deflection element disposed at at least one of an object-side end and an image-side end of the optical lens group. This allows for adjustment of the mounting space required for the optical module to accommodate miniaturized electronic devices.

[0098] Furthermore, the glass lens can be an array lens. The light source can be multiple display elements arranged in an array. Specifically, the array form of the display elements can be the same as the array form of the array lens, but this disclosure is not limited thereto.

[0099] Based on the above implementation methods, specific implementation methods and examples are presented below and described in detail with reference to the accompanying drawings.

[0100] <First Embodiment>

[0101] Please refer to Figure 1A The diagram illustrates a schematic representation of the optical lens group 100 of the optical module according to the first embodiment of this disclosure. Figure 1AAs shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 100. An optical axis X passes through the optical lens group 100, and the optical lens group 100 includes a lens barrel (not shown) and at least three lenses. The at least three lenses are disposed in the lens barrel, and are arranged sequentially from the object side to the image side as glass lenses 120, 130, 140, 150, and 160, 170. Glass lenses 120 and 130 are closer to the light source than lenses 140, 160, and 170, and glass lens 150 is closer to the light source than lenses 160 and 170. Glass lenses 120, 130, 150, 140, 160, and 170 all have refractive power, and the optical surfaces of glass lenses 120, 130, 150, 140, 160, and 170 are all non-planar. Furthermore, anti-reflective coatings 121 and 122 are formed on the optical surfaces of glass lens 120 (i.e., the two surfaces of glass lens 120), anti-reflective coatings 131 and 132 are formed on the optical surfaces of glass lens 130 (i.e., the two surfaces of glass lens 130), and anti-reflective coatings 151 and 152 are formed on the optical surfaces of glass lens 150 (i.e., the two surfaces of glass lens 150).

[0102] Please refer to Figure 1B and Figure 1C ,in Figure 1B Drawing according to Figure 1A A schematic diagram of the glass lens 150 in the first embodiment. Figure 1C Drawing according to Figure 1B A cross-sectional schematic diagram of the anti-reflection coating 152 on the optical surface of the glass lens 150 in the first embodiment under an electron microscope. (See diagram below.) Figure 1B and Figure 1C As shown, the antireflective coating 152 of the glass lens 150 is formed on the optical surface 153 of the glass lens 150, and includes a nanostructure layer 1521 and a structural connection layer 1522. The nanostructure layer 1521 has a plurality of ridge-like protrusions extending non-directionally from the optical surface 153. The material of the nanostructure layer 1521 includes aluminum oxide, and the average structural height of the nanostructure layer 1521 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. Specifically, the ridge-like protrusions may have a shape that is wider at the bottom and narrower at the top. The structural height of the nanostructure layer 1521 may be the vertical distance H1 from the bottom (foot portion) of the ridge-like protrusion to the top (summit portion) of the ridge-like protrusion when viewed in cross-section (destructive measurement), and the average structural height of at least three or more ridge-like protrusions of the nanostructure layer 1521 (that is, the average height of H1) may be greater than or equal to 80 nanometers and less than or equal to 350 nanometers. In the first embodiment, the structural height H1 of the nanostructure layer 1521 is 247.4 nanometers, but the content disclosed herein is not limited thereto.

[0103] A structural connection layer 1522 is disposed between the optical surface 153 and the nanostructure layer 1521. The structural connection layer 1522 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom portion of the nanostructure layer 1521. The thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. In the first embodiment, the thickness of the silicon dioxide film layer is 75.15 nanometers, but this disclosure is not limited thereto.

[0104] like Figure 1A As shown, the optical lens group 100 may further include an adhesive lens. Specifically, in the first embodiment, lenses 160 and 170 are adhesive lenses, and the image-side surface of lens 160 is adhesively bonded to the object-side surface of lens 170.

[0105] Depend on Figure 1A As can be seen, the lens barrel includes a front cover 111 and a barrel body 112. The front cover 111 is disposed on the barrel body 112. The glass lens 120 is in contact with the front cover 111, and the glass lenses 120, 130, 150 and lenses 140, 160, and 170 are housed in the barrel body 112 and are all in contact with the barrel body 112. In addition, other optical elements, such as light shields, spacers, and fixing rings, can be disposed in the lens barrel as needed, which will not be described in detail here.

[0106] Please refer to the following: Figure 1D and Figure 1E ,in Figure 1D Drawing according to Figure 1B A schematic diagram showing the reflectivity parameters of the object-side and image-side surfaces of the glass lens 150 in the first embodiment, where no anti-reflection coating is provided. Figure 1E Drawing according to Figure 1B A schematic diagram showing the reflectivity parameters of antireflective coatings 151 and 152 on the object-side and image-side surfaces of the glass lens 150 in the first embodiment. (See diagram for reference.) Figure 1D As shown, the reflectivities of the object-side and image-side surfaces of the glass lens 150 without an anti-reflective coating are N4R1 and N4R2, respectively. Figure 1E As shown, the reflectivities of the object-side surface (i.e., the surface with anti-reflective coating 151) and the image-side surface (i.e., the surface with anti-reflective coating 152) of the glass lens 150 with anti-reflective coating are G4R1 and G4R2, respectively. The data of light wavelengths corresponding to the reflectivities N4R1, N4R2, G4R1, and G4R2 of the glass lens 150 are shown in Table 1 below.

[0107]

[0108]

[0109]

[0110]

[0111]

[0112]

[0113]

[0114]

[0115]

[0116]

[0117]

[0118]

[0119]

[0120]

[0121]

[0122]

[0123]

[0124]

[0125]

[0126]

[0127]

[0128]

[0129]

[0130]

[0131]

[0132] As shown in Table 1, the average reflectance of the object-side and image-side surfaces of glass lens 150 without anti-reflective coatings is 0.58% and 0.68% respectively for wavelengths from 400 nm to 780 nm. However, the average reflectance R of the object-side and image-side surfaces of glass lens 150 with anti-reflective coatings 151 and 152 for wavelengths from 400 nm to 780 nm is... avgThe values ​​are 0.13% and 0.09%, respectively. The object-side and image-side surfaces of the glass lens 150 are provided with anti-reflective coatings 151 and 152, with a maximum reflectivity R corresponding to light wavelengths from 400 nm to 780 nm. abs The values ​​are 0.7% and 0.9%, respectively. By applying an anti-reflective coating, the reflectivity of the glass lens can be effectively reduced.

[0133] In the first embodiment, the distance along the optical axis X between a first side surface (object-side surface of glass lens 120) and a second side surface (image-side surface of lens 170) in the optical lens group 100 is D. S1SL The distance along the optical axis X from the optical surface 153 of the glass lens 150 to the second side surface is D. SoSL The distance from the object-side surface of the first lens (i.e., glass lens 120) of the optical lens group 100 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table 2 below.

[0134]

[0135] Furthermore, regarding the glass lens 120 in the first embodiment, the average height of the nanostructure layers of its antireflective coatings 121 and 122 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers, while the thickness of the silicon dioxide film layer in the structural connecting layer of each antireflective coating 121 and 122 is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens 120 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer of the antireflective coating 121 and the structural connecting layer of the antireflective coating 122 of the glass lens 120 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 3 below.

[0136]

[0137] In the first embodiment of the glass lens 130, the average height of the nanostructure layers of its antireflective coatings 131 and 132 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers, while the thickness of the silica film layer in the structural connecting layer of each antireflective coating 131 and 132 is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens 130 operates within a temperature range of -30°C. o C to 70 oC, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, a structural connecting layer of the antireflective coating 131 and a structural connecting layer of the antireflective coating 132 of the glass lens 130 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 4 below.

[0138]

[0139] Regarding the glass lens 150 in the first embodiment, the glass lens 150 is in the temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1, a structural connecting layer of the antireflective coating 151 of the glass lens 150 and a structural connecting layer 1522 of the antireflective coating 152, in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, a temperature coefficient of relative refractive index of dn / dt, and the parameters satisfy the conditions in Table 5 below.

[0140]

[0141] It is worth noting that the average reflectance R of the optical surfaces of glass lenses 120 and 130 corresponds to light wavelengths from 400 nm to 780 nm. avg and the maximum reflectivity R abs Each of the following conditions must be met: 0% ≤ R avg ≤ 0.5%; and 0% ≤ R abs ≤ 1.0%. Furthermore, the optical surface of the glass lens in the following second to sixth embodiments also meets the above conditions, and will not be described again.

[0142] <Second Embodiment>

[0143] Please refer to Figure 2 The diagram illustrates a schematic representation of the optical lens group 200 of the optical module according to the second embodiment of this disclosure. Figure 2As shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 200. An optical axis X passes through the optical lens group 200, and the optical lens group 200 includes a lens barrel (not shown) and at least three lenses. The at least three lenses are disposed in the lens barrel, and from the object side to the image side, they are, in sequence, glass lens 220, lens 230, glass lens 240, and lenses 250, 260, and 270. Glass lens 220 is closer to the light source than lenses 230, 250, 260, and 270, and glass lens 240 is closer to the light source than lenses 250, 260, and 270. Glass lenses 220, 240, 230, 250, 260, and 270 all have refractive power, and the optical surfaces of glass lenses 220, 240, 230, 250, 260, and 270 are all non-planar.

[0144] Furthermore, an anti-reflective coating 221 is formed on the optical surface of glass lens 220 (i.e., the image-side surface of glass lens 220), and anti-reflective coatings 241 and 242 are formed on the optical surfaces of glass lens 240 (i.e., the two surfaces of glass lens 240). Taking the anti-reflective coating 241 of glass lens 240 as an example, the anti-reflective coating 241 of glass lens 240 is formed on the optical surface 243 of glass lens 240 and includes a nanostructure layer 2411 and a structural connection layer 2412. The nanostructure layer 2411 has multiple ridge-like protrusions extending non-directionally from the optical surface 243. The material of the nanostructure layer 2411 includes aluminum oxide, and the average structural height of the nanostructure layer 2411 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. A structural connection layer 2412 is disposed between the optical surface 243 and the nanostructure layer 2411. The structural connection layer 2412 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom part of the nanostructure layer 2411, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers.

[0145] like Figure 2 As shown, the optical lens group 200 may further include an adhesive lens. Specifically, in the second embodiment, lenses 260 and 270 are adhesive lenses, and an image-side surface of lens 260 is adhesively bonded to an object-side surface of lens 270.

[0146] Depend on Figure 2 As can be seen, the lens barrel includes a front cover 211 and a barrel body 212. The front cover 211 is disposed on the barrel body 212 and contacts the glass lens 220. Glass lenses 220, 240 and lenses 230, 250, 260 and 270 are housed in the barrel body 212 and all contact the barrel body 212. In addition, other optical elements, such as light shields, spacers, and retaining rings, can be installed in the lens barrel as needed, which will not be described in detail here.

[0147] In the second embodiment, the distance along the optical axis X between a first side surface (object-side surface of glass lens 220) and a second side surface (image-side surface of lens 270) in the optical lens group 200 is D. S1SL The distance along the optical axis X from the optical surface (image-side surface of glass lens 240) to the second side surface is D. SoSL The distance from the object-side surface of the first side lens (i.e., glass lens 220) of the optical lens group 200 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table 6 below.

[0148]

[0149] Furthermore, regarding the glass lens 220 in the second embodiment, the average height of the nanostructure layer of its antireflective coating 221 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers, while the thickness of the silicon dioxide film layer in the structural connecting layer of the antireflective coating 221 is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens 220 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, a structural bonding layer of the antireflective coating 221 of the glass lens 220 in the temperature range of -30°C o C to 70 o C has a second average linear expansion coefficient α2, the thickness of a nanostructure layer of the antireflective film 221 is d1, the thickness of the silicon dioxide layer of the structural connection layer of the antireflective film 221 is d2, and the parameters satisfy the conditions in Table 7 below.

[0150]

[0151] Regarding the glass lens 240 in the second embodiment, the glass lens 240 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer 2412 of the antireflective coating layer 241 of the glass lens 240 and a structural connecting layer of the antireflective coating layer 242 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 8 below.

[0152]

[0153] <Third Embodiment>

[0154] Please refer to Figure 3The diagram illustrates a schematic representation of the optical lens group 300 of the optical module according to the third embodiment of this disclosure. Figure 3 As shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 300. An optical axis X passes through the optical lens group 300, and the optical lens group 300 includes a lens barrel (not shown) and at least three lenses. The at least three lenses are disposed in the lens barrel, and are arranged sequentially from the object side to the image side as glass lens 320, lens 330, 340, 350, 360, 370, 380 and glass lens 390, wherein glass lens 320 is closer to the light source than lenses 330, 340, 350, 360, 370 and 380. Glass lenses 320, 390 and lenses 330, 340, 350, 360, 370 and 380 all have refractive power, and the optical surfaces of glass lenses 320, 390 and lenses 330, 340, 350, 360, 370 and 380 are all non-planar.

[0155] Specifically, glass lenses 320 and 360 are molded glass lenses, while lenses 330, 340, 350, 370, 380 and glass lens 390 are ground glass lenses. In the third embodiment, the optical surface of glass lens 320 has a curvature point 324, but this disclosure is not limited thereto.

[0156] Furthermore, antireflective coatings 321 and 322 are formed on the optical surfaces of the glass lens 320 (i.e., the two surfaces of the glass lens 320), and an antireflective coating 391 is formed on the optical surface of the glass lens 390 (i.e., the object-side surface of the glass lens 390). Taking the antireflective coating 321 of the glass lens 320 as an example, the antireflective coating 321 of the glass lens 320 is formed on the optical surface 323 of the glass lens 320 and includes a nanostructure layer 3211 and a structural connection layer 3212. The nanostructure layer 3211 has multiple ridge-like protrusions extending non-directionally from the optical surface 323. The material of the nanostructure layer 3211 includes aluminum oxide, and the average structural height of the nanostructure layer 3211 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. A structural connection layer 3212 is disposed between the optical surface 323 and the nanostructure layer 3211. The structural connection layer 3212 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom part of the nanostructure layer 3212, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers.

[0157] like Figure 3As shown, the optical lens group 300 may further include bonded lenses. Specifically, in the third embodiment, glass lenses 320 and 390 and lenses 330, 340, 350, 360, 370, and 380 are all bonded lenses, wherein the image-side surface of glass lens 320 is bonded to the object-side surface of lens 330, the image-side surface of lens 340 is bonded to the object-side surface of lens 350, the image-side surface of lens 360 is bonded to the object-side surface of lens 370, the image-side surface of lens 370 is bonded to the object-side surface of lens 380, and the image-side surface of lens 380 is bonded to the object-side surface of glass lens 390.

[0158] Depend on Figure 3 As can be seen, the lens barrel includes a front cover 311 and a barrel body 312. The front cover 311 is disposed on the barrel body 312 and contacts the glass lens 320. Glass lenses 320, 390 and lenses 330, 340, 350, 360, 370 and 380 are housed in the barrel body 312 and all contact the barrel body 312. In addition, other optical elements, such as light shields, spacers, and fixing rings, can be installed in the lens barrel as needed, which will not be described in detail here.

[0159] In the third embodiment, the distance along the optical axis X between a first side surface (object-side surface of glass lens 320) and a second side surface (image-side surface of glass lens 390) in the optical lens group 300 is D. S1SL The distance along the optical axis X from the optical surface (object-side surface of glass lens 390) to the second side surface is D. SoSL The distance from the object-side surface of the first lens (i.e., glass lens 320) of the optical lens group 300 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table 9 below.

[0160]

[0161] Furthermore, regarding the glass lens 320 in the third embodiment, the glass lens 320 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer 3212 of the anti-reflective coating layer 321 of the glass lens 320 and a structural connecting layer of the anti-reflective coating layer 322 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 10 below.

[0162]

[0163] In the third embodiment, for the glass lens 390, the average height of the nanostructure layer of its antireflective coating 391 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers, while the thickness of the silica film layer in the structural connecting layer of the antireflective coating 391 is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens 390 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, a structural bonding layer of the antireflective coating 391 of the glass lens 390 in the temperature range of -30°C o C to 70 o C has a second average linear expansion coefficient α2, and the parameter satisfies the conditions in Table 11 below.

[0164]

[0165] <Fourth Embodiment>

[0166] Please refer to Figure 4 The diagram illustrates a schematic representation of the optical lens group 400 of the optical module according to the fourth embodiment of this disclosure. Figure 4 As shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 400. An optical axis X passes through the optical lens group 400, and the optical lens group 400 includes a lens barrel (not shown) and at least three lenses. The at least three lenses are disposed in the lens barrel, and are arranged sequentially from the object side to the image side as lenses 420, 430, glass lens 440, and lenses 450, 460, 470, 480, and 490, wherein glass lens 440 is closer to the light source than lenses 450, 460, 470, 480, and 490. Lenses 420, 430, 450, 460, 470, 480, 490, and glass lens 440 all have refractive power, and the optical surfaces of lenses 420, 430, 450, 460, 470, 480, 490, and glass lens 440 are non-planar.

[0167] Furthermore, antireflective coatings 441 and 442 are formed on the optical surfaces (i.e., the two surfaces of the glass lens 440). Taking the antireflective coating 441 of the glass lens 440 as an example, the antireflective coating 441 of the glass lens 440 is formed on the optical surface 443 of the glass lens 440 and includes a nanostructure layer 4411 and a structural connection layer 4412. The nanostructure layer 4411 has multiple ridge-like protrusions extending non-directionally from the optical surface 443. The material of the nanostructure layer 4411 includes aluminum oxide, and the average structural height of the nanostructure layer 4411 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. A structural connection layer 4412 is disposed between the optical surface 443 and the nanostructure layer 4411. The structural connection layer 4412 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom part of the nanostructure layer 4412, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers.

[0168] like Figure 4 As shown, the optical lens group 400 may further include an adhesive lens. Specifically, in the fourth embodiment, lenses 450 and 460 are adhesive lenses, with the image-side surface of lens 450 bonded to the object-side surface of lens 460.

[0169] Depend on Figure 4 As can be seen, the lens barrel includes a front cover 411 and a barrel body 412. The front cover 411 is disposed on the barrel body 412 and contacts the lens 420. Glass lenses 420, 440 and lenses 430, 450, 460, 470, 480, and 490 are housed in the barrel body 412 and all contact the barrel body 412. In addition, other optical elements, such as light shields, spacers, and retaining rings, can be installed in the lens barrel as needed, which will not be described in detail here.

[0170] In the fourth embodiment, the distance along the optical axis X between a first side surface (object-side surface of lens 420) and a second side surface (image-side surface of lens 490) in the optical lens group 400 is D. S1SL The distance along the optical axis X from the optical surface (image-side surface of glass lens 440) to the second side surface is D. SoSL The distance from the object-side surface of the first lens (i.e., lens 420) of the optical lens group 400 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table XII below.

[0171]

[0172] Furthermore, glass lens 440 operates within a temperature range of -30°C. o C to 70 oC, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer 4412 of the antireflective coating layer 441 of the glass lens and a structural connecting layer of the antireflective coating layer 442 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 13 below.

[0173]

[0174] <Fifth Embodiment>

[0175] Please refer to Figure 5 The diagram illustrates the optical lens group 500 of the optical module according to the fifth embodiment of this disclosure. Figure 5 As shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 500. An optical axis X passes through the optical lens group 500, and the optical lens group 500 includes a lens barrel 510 and at least three lenses. The at least three lenses are disposed in the lens barrel 510, and are arranged sequentially from the object side to the image side as a glass lens 520 and lenses 530, 540, 550, 560, and 570. The glass lens 520 is disposed on the first side of the optical lens group 500. Lenses 530, 540, 550, 560, and 570 are all plastic lenses and are disposed along the optical axis X at one image-side end of the glass lens 520. The glass lens 520 is closer to the light source than lenses 530, 540, 550, 560, and 570. Glass lens 520 and lenses 530, 540, 550, 560 and 570 all have refractive power, and the optical surfaces of glass lens 520 and lenses 530, 540, 550, 560 and 570 are non-planar.

[0176] Furthermore, antireflective coatings 521 and 522 are formed on the optical surface of the glass lens 520. Taking the antireflective coating 521 of the glass lens 520 as an example, the antireflective coating 521 of the glass lens 520 is formed on the optical surface 523 of the glass lens 520 and includes a nanostructure layer 5211 and a structural connection layer 5212. The nanostructure layer 5211 has multiple ridge-like protrusions extending non-directionally from the optical surface 523. The material of the nanostructure layer 5211 includes aluminum oxide, and the average structural height of the nanostructure layer 5211 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. The structural connection layer 5212 is disposed between the optical surface 523 and the nanostructure layer 5211. The structural connection layer 5212 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom part of the nanostructure layer 5212, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers.

[0177] like Figure 5 As shown, the optical lens group 500 may further include an adhesive lens. Specifically, in the fifth embodiment, lenses 560 and 570 are adhesive lenses, with the image-side surface of lens 560 bonded to the object-side surface of lens 570.

[0178] In addition, other optical elements, such as light shields, spacers, and fixing rings, can be installed in the lens barrel 510 as needed, which will not be described in detail here.

[0179] In the fifth embodiment, the distance along the optical axis X between a first side surface (object-side surface of glass lens 520) and a second side surface (image-side surface of lens 570) in the optical lens group 500 is D. S1SL The distance along the optical axis X from the optical surface (image-side surface of glass lens 520) to the second side surface is D. SoSL The distance from the object-side surface of the first side lens (i.e., glass lens 520) of the optical lens group 500 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table XIV below.

[0180]

[0181] Furthermore, the glass lens 520 operates within a temperature range of -30°C. o C to 70 o C, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer 5212 of the antireflective coating layer 521 of the glass lens 520 and a structural connecting layer of the antireflective coating layer 522 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 15 below.

[0182]

[0183] Furthermore, the first lens on the first side of the optical lens group 500 is most sensitive to temperature effects. Therefore, when the glass lens 520 is a glass lens with a low coefficient of thermal expansion α1, the optical lens group 500 can remain stable after temperature changes and maintain the function of the anti-reflective coatings 521 and 522 (film thickness, adhesion, film integrity, cutoff wavelength). At the same time, the optical lens can improve design freedom, increase production efficiency, and reduce production costs by combining it with a plastic lens.

[0184] <Sixth Embodiment>

[0185] Please refer to Figure 6 The diagram illustrates a schematic representation of the optical lens group 600 of the optical module according to the sixth embodiment of this disclosure. Figure 6As shown, the optical module (not shown) includes a light source (not illustrated) and an optical lens group 600. An optical axis X passes through the optical lens group 600, and the optical lens group 600 includes a lens barrel 610 and at least three lenses. The at least three lenses are disposed in the lens barrel 610, and are arranged sequentially from the object side to the image side as lenses 620, 630, 640, and 650, 660, and 670, wherein the glass lens 640 is closer to the light source than lenses 650, 660, and 670. Lenses 620, 630, 650, 660, 670, and glass lens 640 all have refractive power, and the optical surfaces of lenses 620, 630, 650, 660, 670, and glass lens 640 are non-planar.

[0186] Furthermore, antireflective coatings 641 and 642 are formed on the optical surface of the glass lens 640. Taking the antireflective coating 641 of the glass lens 640 as an example, the antireflective coating 641 of the glass lens 640 is formed on the optical surface 643 of the glass lens 640 and includes a nanostructure layer 6411 and a structural connection layer 6412. The nanostructure layer 6411 has multiple ridge-like protrusions extending non-directionally from the optical surface 643. The material of the nanostructure layer 6411 includes aluminum oxide, and the average structural height of the nanostructure layer 6411 is greater than or equal to 80 nanometers and less than or equal to 350 nanometers. The structural connection layer 6412 is disposed between the optical surface 643 and the nanostructure layer 6411. The structural connection layer 6412 includes at least one silicon dioxide film layer (not shown in the figure), which is in solid contact with a bottom part of the nanostructure layer 6412, and the thickness of the silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers.

[0187] Specifically, other optical elements, such as light shields, spacers, and fixing rings, can be installed in the lens barrel 610 as needed, which will not be elaborated here.

[0188] In the sixth embodiment, the distance along the optical axis X between a first side surface (object-side surface of lens 620) and a second side surface (image-side surface of lens 670) in the optical lens group 600 is D. S1SL The distance along the optical axis X from the optical surface (image-side surface of glass lens 640) to the second side surface is D. SoSL The distance from the object-side surface of the first lens (i.e., lens 620) of the optical lens group 600 to an imaging surface along the optical axis X is TL, and the parameter satisfies the conditions in Table 16 below.

[0189]

[0190] Furthermore, the glass lens 640 operates within a temperature range of -30°C. o C to 70 oC, having a first average linear expansion coefficient α1 and a temperature coefficient of relative refractive index of dn / dt, the structural connecting layer 6412 of the antireflective coating layer 641 of the glass lens 640 and a structural connecting layer of the antireflective coating layer 642 are in the temperature range of -30°C. o C to 70 o C, all have a second average linear expansion coefficient α2, and the parameters satisfy the conditions in Table 17 below.

[0191]

[0192] <Seventh Embodiment>

[0193] Please refer to Figures 7A to 7D ,in Figure 7A A schematic diagram of a vehicle tool 70 according to the seventh embodiment of this disclosure is shown. Figure 7B Drawing according to Figure 7A Top view of the vehicle tool 70 of the seventh embodiment. Figure 7C Drawing according to Figure 7A Another schematic diagram of the vehicle tool 70 according to the seventh embodiment. (See diagram below.) Figures 7A to 7C As shown, the vehicle tool 70 includes multiple optical modules 71, which are... Figure 7B and Figure 7C As can be seen, the number of optical modules 71 in the seventh embodiment is six, but the present disclosure is not limited to the above number. The six optical modules 71 are respectively disposed below the left rearview mirror, below the right rearview mirror, at the front of the vehicle tool 70, at the interior rearview mirror of the vehicle tool 70, on the interior rear window of the vehicle tool 70, and at the rear of the vehicle tool 70. The optical modules 71 can be any of the aforementioned first to sixth embodiments, but the present disclosure is not limited to this.

[0194] In the seventh embodiment, each optical module 71 is used to capture image information from a viewing angle θ. Specifically, the viewing angle θ can satisfy the following condition: 40 degrees < θ < 190 degrees. This allows for the capture of image information within a specific range. It is worth noting that the viewing angle θ of each optical module 71 can be different to meet different imaging requirements.

[0195] Depend on Figure 7C As can be seen, the configuration of the optical module 71 helps the driver obtain external spatial information S1, S2, S3, and S4 outside the cockpit. Specifically, the optical module 71 located at the front of the vehicle tool 70 is used to obtain external spatial information S1, the optical modules 71 located below the left and right rearview mirrors are used to obtain external spatial information S2 and S4 respectively, and the optical module 71 located at the rear of the vehicle is used to obtain external spatial information S3, but this disclosure is not limited thereto. This provides more viewing angles to reduce blind spots, thereby contributing to improved driving safety.

[0196] Figure 7D Drawing according to Figure 7A A schematic diagram of the interior space of the vehicle tool 70 according to the seventh embodiment. (See diagram below.) Figure 7D As shown, the optical module 71 installed in the rearview mirror can be used to acquire interior space information S5. Generally, when conventional vehicles are parked and exposed to direct sunlight, the high temperature inside the vehicle can cause temperature drift in the optical module, potentially damaging it and affecting driving safety. By configuring a glass lens with a low coefficient of thermal expansion and an anti-reflective coating, the optical module 71 disclosed herein can maintain stability and image quality even under drastic temperature changes.

[0197] <Eighth Embodiment>

[0198] Please refer to Figure 8A , Figure 8B and Figure 8C ,in Figure 8A A schematic diagram of a head-mounted device 80 according to the eighth embodiment of this disclosure is shown. Figure 8B A schematic diagram illustrating another aspect of a head-mounted device 800 according to the eighth embodiment of this disclosure is shown. Figure 8C Drawing according to Figure 8B Another schematic diagram of the head-mounted device 800 according to the eighth embodiment. (See diagram below.) Figure 8A As shown, the head-mounted device 80 may be a VR device and includes multiple optical modules (not shown). The optical modules may be any of the first to sixth embodiments described above, but this disclosure is not limited thereto.

[0199] Please refer to the following: Figure 8D Its drawing is based on Figure 8B A schematic diagram of the optical module in the eighth embodiment. (See diagram below.) Figure 8B , Figure 8C and Figure 8D As shown, the head-mounted device 800 can be an AR device and includes multiple optical modules (not shown), each optical module including a light source 810 and an optical lens group 820. An optical axis X passes through the optical lens group 820. The optical lens group 820 includes a glass lens 821, and the glass lens 821 has refractive power. An optical surface of the glass lens 821 is non-planar, and an anti-reflective film layer 8211 is formed on the optical surface. Specifically, the anti-reflective film layer 8211 may include a nanostructure layer and a structural connection layer, which can be as described in the first to sixth embodiments, and will not be repeated here. Furthermore, the optical lens group 820 may also include the lenses and other optical elements of the first to sixth embodiments, but the content of this disclosure is not limited thereto.

[0200] In the eighth embodiment, the glass lens 821 may be an array lens. The light source 810 may be a plurality of display elements arranged in an array. Specifically, the array form of the light source 810 may be the same as the array form of the glass lens 821, but this disclosure is not limited thereto.

[0201] Please refer to the following: Figure 8E and Figure 8F ,in Figure 8E Drawing according to Figure 8B A schematic diagram illustrating the use of the head-mounted device 800 according to the eighth embodiment. Figure 8F Drawing according to Figure 8B A schematic diagram illustrating another aspect of the use of the head-mounted device 800 according to the eighth embodiment. (See attached diagram.) Figure 8E As shown, the optical module may further include an image transmission module 830, which is disposed at at least one of an object-side end and an image-side end of the optical lens group 820. In the eighth embodiment, the image transmission module 830 may be a waveguide module and is disposed at the image-side end of the optical lens group 820. Figure 8F As shown, the image transmission module 830 can be an optical path deflection element 840, and is disposed at the image side end of the optical lens group 820. Through the configuration of the image transmission module, the optical path of the imaging light L of the light source 810 can be deflected and transmitted to the user's eyes.

[0202] 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 scope defined in the appended claims.

Claims

1. An optical lens assembly, wherein an optical axis passes through the optical lens assembly, characterized in that, Include: A glass lens has refractive power, and one optical surface of the glass lens is non-planar. An anti-reflective coating is formed on the optical surface, and the anti-reflective coating comprises: A nanostructure layer having multiple ridge-like protrusions extending non-directionally from the optical surface, the nanostructure layer being made of aluminum oxide; and A structural connection layer is disposed between the optical surface and the nanostructure layer. The structural connection layer includes at least one silicon dioxide film layer, which is in contact with a bottom solid of the nanostructure layer. The thickness of the at least one silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens is available in a temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 12×10 -7 / K < α1 < 210×10 -7 / K; The nanostructure layer has pores, and the portion of the nanostructure layer with pores is the thickness of the nanostructure layer t = 0 nm. The structural connection layer corresponding to the portion of the nanostructure layer with pores is exposed to air.

2. The optical lens assembly as described in claim 1, characterized in that, The multiple ridge-like protrusions exhibit a shape that is wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

3. The optical lens assembly as described in claim 1, characterized in that, The distance along the optical axis from a first side surface to a second side surface in the optical lens group is D. S1SL The distance from the optical surface to the second side surface along the optical axis is D. SoSL It satisfies the following conditions: 0.12 ≤ D SoSL / D S1SL < 0.985。 4. The optical lens assembly as described in claim 1, characterized in that, The maximum reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It satisfies the following conditions: 0 % ≤ R abs ≤ 1.0 %。 5. The optical lens assembly as described in claim 4, characterized in that, The average reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It satisfies the following conditions: 0% ≤ R avg ≤ 0.5%。 6. The optical lens assembly as described in claim 1, characterized in that, The glass lens is suitable for temperatures ranging from -30°C. o C to 70 o C, having the first average linear expansion coefficient α1, the structural bonding layer in the temperature range of -30°C o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41。 7. The optical lens assembly as described in claim 1, characterized in that, The glass lens is suitable for temperatures ranging from -30°C. o C to 70 o C has a temperature coefficient of relative refractive index dn / dt that satisfies the following condition: 0.1 × 10 -6 / o C ≤|dn / dt|≤ 17 × 10 -6 / o C。 8. The optical lens assembly as described in claim 1, characterized in that, The optical surface has an inflection point.

9. The optical lens assembly as described in claim 1, characterized in that, The distance TL from the object-side surface of a first lens of the optical lens group to an imaging plane along the optical axis satisfies the following condition: 8 mm ≤ TL.

10. The optical lens assembly as claimed in claim 1, characterized in that, The glass lens is disposed on the first side of the optical lens group, and the optical lens group also includes a plastic lens disposed along the optical axis at one image-side end of the glass lens.

11. The optical lens assembly as claimed in claim 1, characterized in that, It also includes an adhesive lens.

12. The optical lens assembly as claimed in claim 1, characterized in that, Also includes: At least one optical path deflection element is disposed at at least one of the object-side end and the image-side end of the optical lens group.

13. An optical module, characterized in that, Include: A light source; and An optical lens group, with an optical axis passing through the optical lens group, comprising: At least three lenses, at least one of which is a glass lens, wherein the at least one glass lens has refractive power and is closer to the light source than the other at least two lenses, and an optical surface of the at least one glass lens is non-planar, and an anti-reflective coating is formed on the optical surface, the anti-reflective coating comprising: A nanostructure layer having multiple ridge-like protrusions extending non-directionally from the optical surface, the nanostructure layer being made of aluminum oxide; and A structural connection layer is disposed between the optical surface and the nanostructure layer. The structural connection layer includes at least one silicon dioxide film layer, which is in contact with a bottom solid of the nanostructure layer. The thickness of the at least one silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The glass lens is available in a temperature range of -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 12×10 -7 / K < α1 < 210×10 -7 / K; The nanostructure layer has pores, and the portion of the nanostructure layer with pores is the thickness of the nanostructure layer t = 0 nm. The structural connection layer corresponding to the portion of the nanostructure layer with pores is exposed to air.

14. The optical module as described in claim 13, characterized in that, The multiple ridge-like protrusions exhibit a shape that is wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

15. The optical module as described in claim 13, characterized in that, The distance along the optical axis from a first side surface to a second side surface in the optical lens group is D. S1SL The distance from the optical surface to the second side surface along the optical axis is D. SoSL It satisfies the following conditions: 0.12 ≤ D SoSL / D S1SL < 0.985。 16. The optical module as described in claim 13, characterized in that, At least one of the glass lenses is an array lens.

17. The optical module as described in claim 13, characterized in that, The maximum reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It satisfies the following conditions: 0 % ≤ R abs ≤ 1.0 %。 18. The optical module as claimed in claim 17, characterized in that, The average reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It satisfies the following conditions: 0 % ≤ R avg ≤ 0.5 %。 19. The optical module as described in claim 13, characterized in that, The glass lens is suitable for temperatures ranging from -30°C. o C to 70 o C, having the first average linear expansion coefficient α1, the structural bonding layer in the temperature range of -30°C o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41。 20. The optical module as described in claim 13, characterized in that, The optical lens group also includes: At least one optical path deflection element is disposed at at least one of the object-side end and the image-side end of the optical lens group.

21. The optical module as described in claim 13, characterized in that, The light source is multiple display elements arranged in an array.

22. An optical module, characterized in that, Include: A light source; and An optical lens group, with an optical axis passing through the optical lens group, comprising: At least three lenses, at least one of which is a glass lens, wherein the at least one glass lens has refractive power and is closer to the light source than the other at least two lenses, and an optical surface of the at least one glass lens is non-planar, and an anti-reflective coating is formed on the optical surface, the anti-reflective coating comprising: A nanostructure layer having multiple ridge-like protrusions extending non-directionally from the optical surface, the nanostructure layer being made of aluminum oxide; and A structural connection layer is disposed between the optical surface and the nanostructure layer. The structural connection layer includes at least one silicon dioxide film layer, which is in contact with a bottom solid of the nanostructure layer. The thickness of the at least one silicon dioxide film layer is greater than or equal to 20 nanometers and less than or equal to 150 nanometers. The maximum effective radius of the optical surface is Y, and the maximum displacement SAG parallel to the optical axis is from the intersection of the optical surface and the optical axis to the position of the maximum effective radius of the optical surface. glass The glass lens is resistant to temperatures ranging from -30°C. o C to 70 o C has a first average linear expansion coefficient α1, which satisfies the following condition: 0.01 ≤ SAG glass / Y ≤ 0.99; and 12×10 -7 / K < α1 < 210×10 -7 / K; The nanostructure layer has pores, and the portion of the nanostructure layer with pores is the thickness of the nanostructure layer t = 0 nm. The structural connection layer corresponding to the portion of the nanostructure layer with pores is exposed to air.

23. The optical module as described in claim 22, characterized in that, The multiple ridge-like protrusions exhibit a shape that is wider at the bottom and narrower at the top, and the average height of the nanostructure layer is greater than or equal to 80 nanometers and less than or equal to 350 nanometers.

24. The optical module as claimed in claim 22, characterized in that, At least one of the glass lenses is an array lens.

25. The optical module as described in claim 22, characterized in that, The maximum reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. abs It satisfies the following conditions: 0 % ≤ R abs ≤ 1.0 %。 26. The optical module as described in claim 25, characterized in that, The average reflectance of the optical surface of this glass lens corresponding to light wavelengths from 400 nm to 780 nm is R. avg It satisfies the following conditions: 0 % ≤ R avg ≤ 0.5 %。 27. The optical module as described in claim 22, characterized in that, The glass lens is suitable for temperatures ranging from -30°C. o C to 70 o C, having the first average linear expansion coefficient α1, the structural bonding layer in the temperature range of -30°C o C to 70 o C has a second average linear expansion coefficient α2, which satisfies the following condition: 0.2 < α1 / α2 < 41。 28. The optical module as described in claim 22, characterized in that, The point where the optical surface intersects the optical axis has a maximum displacement (SAG) parallel to the optical axis from the position of the maximum effective radius of the optical surface. glass It satisfies the following conditions: 90 μm ≤ SAG glass 。 29. The optical module as described in claim 28, characterized in that, The optical surface has an inflection point.

30. The optical module as described in claim 22, characterized in that, The optical lens group also includes: At least one optical path deflection element is disposed at at least one of the object-side end and the image-side end of the optical lens group.

31. The optical module as described in claim 22, characterized in that, The light source is multiple display elements arranged in an array.

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