Microstructured optical member and optical lens module

Abstract

A microstructured optical component includes a low-reflective optical surface defining a cross-section having a plurality of peaks and a plurality of valleys, the cross-section defining a maximum height and a virtual horizontal half-height line, the maximum height being a distance between a highest peak and a lowest valley in a vertical direction, the virtual horizontal half-height line being a half of the maximum height distance from the highest peak, wherein the plurality of peaks includes at least one high peak and at least one low peak, the at least one high peak being positioned above the virtual horizontal half-height line, and the at least one low peak being positioned below the virtual horizontal half-height line. An optical lens module including the microstructured optical component is also provided.

Description

Technical Field

[0001] This utility model relates to an optical lens; in particular, it refers to an optical component with a microstructure and an optical lens module. Background Technology

[0002] With the rapid advancement of camera technology, lens modules have been widely used in various camera devices, especially with the increasing integration of them with various portable electronic devices (such as smartphones, laptops, and tablets). As a key component of the photosensitive imaging system, the design and performance of the lens module have a decisive impact on the overall image quality of the camera device.

[0003] However, existing lens modules still commonly face the problem of stray light in practical applications. Stray light refers to light that enters the sensing element without traveling along a designed path. This type of light may originate from non-ideal reflections from the surface of optical elements (such as excess reflections or transmissions from the lens surface) or secondary reflections caused by non-optical element surfaces (such as the inner wall of the lens barrel, fixed structures, etc.). This type of stray light easily leads to image quality degradation. Specifically, it causes a decrease in the modulation transfer function (MTF) of the lens module, thereby affecting image sharpness, tonal gradation, and color saturation, limiting the development of lens modules in high-quality video applications. Summary of the Invention

[0004] In view of this, the present invention provides a microstructured optical component that has the function of dispersing stray light, thereby eliminating stray light from entering the lens barrel.

[0005] To achieve the above objectives, the present invention provides a microstructured optical component, which is selected from one or a combination of a group consisting of a lens barrel, a lens, and a spacer ring. The microstructured optical component includes: a low-reflection optical surface having a microstructured region, wherein the microstructured region is an area of ​​0.3mm x 0.3mm arbitrarily selected on the low-reflection optical surface; the microstructured region defines a cross-section corresponding to the side length direction of the microstructured region; the cross-section has multiple peaks and multiple troughs distributed thereon; the cross-section defines a maximum wave height and a virtual horizontal half-height line; the maximum wave height is the highest peak of the multiple peaks and the lowest trough of the multiple troughs. The distance between the virtual horizontal half-height line and the highest peak is half the maximum peak distance, and the virtual horizontal half-height line is located between the highest peak and the lowest trough. The multiple peaks include at least one high-level peak and at least one low-level peak. The position of the at least one high-level peak is above the virtual horizontal half-height line, and the position of the at least one low-level peak is below the virtual horizontal half-height line. The cross-section satisfies the following conditions: 0.05% ≤ R ≤ 2.00%; and NP2 ≤ NP1; where R is the surface reflectivity of the cross-section; NP1 is the number of the at least one high-level peak; and NP2 is the number of the at least one low-level peak.

[0006] Another embodiment of the present invention provides an optical lens module comprising a lens barrel, a lens group, an aperture, and a spacer ring; the lens barrel has an object-side opening; the lens group is disposed inside the lens barrel, and the lens group includes multiple lenses along an optical axis from the object side to the image side from the object side opening; the aperture is installed inside the lens barrel, and the aperture is located between the object side and the image side; the spacer ring is installed inside the lens barrel, and the spacer ring surrounds the optical axis and is disposed on one side of the object side or the image side of one of the lenses; wherein one or a combination thereof of the lens barrel, the multiple lenses, and the spacer ring is selected from the aforementioned microstructured optical components.

[0007] The advantage of this invention lies in the fact that the low-reflection optical surface of the microstructured optical component has a microstructured region design, in which the microstructured region has irregularly arranged high and low peaks, effectively dispersing stray light. Furthermore, the cross-section at least satisfies the conditions of 0.05% ≤ R ≤ 2.00% and NP2 ≤ NP1, providing an optimized effect for removing stray light. The microstructured optical component can be applied to the optical lens module, enabling the optical lens module to disperse stray light and achieve the purpose of eliminating stray light from entering the lens barrel. Attached Figure Description

[0008] The above and other features of this utility model will be described in detail with reference to the accompanying drawings.

[0009] Figure 1A This is a structural diagram of the optical lens module of the first preferred embodiment of the present invention.

[0010] Figure 1B This is a cross-sectional planar analysis diagram of a microstructured optical component according to the first preferred embodiment of the present invention.

[0011] Figure 1C The reflectance curve of the microstructured optical component of the first preferred embodiment of this utility model is shown.

[0012] Figure 2A This is a cross-sectional planar analysis diagram of a microstructured optical component according to the second preferred embodiment of the present invention.

[0013] Figure 2B This is a reflectance curve of a microstructured optical component according to the second preferred embodiment of the present invention.

[0014] Figure 3A This is a cross-sectional planar analysis diagram of a microstructured optical component according to the third preferred embodiment of the present invention.

[0015] Figure 3B The reflectance curve of the microstructured optical component is shown in the third preferred embodiment of this utility model.

[0016] Figure 4A This is a cross-sectional planar analysis diagram of a microstructured optical component according to the fourth preferred embodiment of the present invention.

[0017] Figure 4B The reflectance curve of the microstructured optical component of the fourth preferred embodiment of this utility model is shown.

[0018] Explanation of reference numerals in the attached figures

[0019] 100: Optical lens module

[0020] 200, 300, 400, 500: Microstructured optical components

[0021] 210: Low-reflection optical surface

[0022] 220, 320, 420, 520: Microstructural regions

[0023] 230, 330, 430, 530: Cross-section

[0024] 10: Lens tube

[0025] 11: Object side opening

[0026] 12: Sunshade ring

[0027] 13: Mirror base

[0028] 20: Lens Group

[0029] 21: Lens

[0030] 21A: Effective optical area

[0031] 21B: Optical Invalid Region

[0032] 211: Side view of the object

[0033] 212: Like the side view

[0034] 30: Spacer ring

[0035] 31: Inner circumference

[0036] 40: Aperture

[0037] 50: Optical sensing element

[0038] Z: Optical axis

[0039] H: Maximum wave height

[0040] X: Virtual horizontal half-height line

[0041] P: Peak

[0042] Pt: Highest peak

[0043] P1: High peak

[0044] P2: Low-level peak

[0045] C: trough

[0046] Ct: Lowest trough

[0047] C1: High-level trough

[0048] C2: Low-level trough

[0049] D: The maximum vertical distance between the low-level trough and the adjacent peak.

[0050] d: The minimum vertical distance between the low-level peak and the adjacent trough. Detailed Implementation

[0051] To more clearly illustrate this utility model, preferred embodiments are described in detail below with reference to the accompanying drawings. Please refer to... Figure 1A The optical lens module 100 of the first preferred embodiment of the present invention includes a lens barrel 10, a lens group 20, a plurality of spacer rings 30, an aperture 40 and an optical sensing element 50.

[0052] The lens barrel 10 is hollow inside and made of opaque material. An object-side opening 11 extends through the lens barrel 10, connecting to the interior of the lens barrel 10 to allow the passage of an optical axis Z. The lens barrel 10 has a light-shielding ring 12, which is radially recessed at one end of the lens barrel 10 and surrounds the optical axis Z. The object-side opening 11 is located inside the light-shielding ring 12. The lens barrel 10 has a lens mount 13, which is attached to the other end of the lens barrel 10 opposite to the light-shielding ring 12. In this embodiment, the lens mount 13 is integrally formed into the lens barrel 10. In other embodiments, the lens mount 13 is detachably assembled onto the lens barrel 10.

[0053] The lens group 20 is installed inside the lens barrel 10. The lens group 20 includes multiple lenses 21 and an imaging plane (not shown) extending from the object-side opening 11 along the optical axis Z from the object side to the image side. The multiple lenses 21 each have refractive power and are arranged sequentially inside the lens barrel 10. In the first embodiment, the number of lenses 21 is described as four, but this is not a limitation. In other embodiments, the lens 21 may be at least one. Figure 1A As shown, each of the lenses 21 has an optically effective region 21A and an optically ineffective region 21B. The optically effective region 21A corresponds to the position of the object-side aperture 11, and the optical axis Z passes through the optically effective region 21A of each of the lenses 21. The optically ineffective region 21B surrounds the optically effective region 21A.

[0054] The spacer rings 30 are made of opaque material and are installed inside the lens barrel 10. The spacer rings 30 surround the optical axis Z, and each spacer ring 30 is disposed on one side of the object side 211 and the image side 212 of each lens 21. For example, each spacer ring 30 is disposed between the object side 211 of one adjacent lens 21 and the image side 212 of the other lens 21. If the lens 21 is close to the light-shielding ring 12 of the lens barrel 10, the spacer ring 30 is disposed on the object side 211 of the lens 21 and abuts against the light-shielding ring 12. However, this is not a limitation. In other embodiments, there may be at least one spacer ring 30, and the spacer ring 30 may be disposed on one side of the object side 211 or the image side 212 of one of the lenses 21.

[0055] The aperture 40 is installed inside the lens barrel 10. The aperture 40 is located between the object side and the image side of the lens group 20. In the first embodiment, the aperture 40 surrounds the optical axis Z and is located between two adjacent lenses 21.

[0056] The optical sensing element 50 is disposed inside the lens barrel 10. The optical sensing element 50 is mounted on the lens mount 13 and is located on the imaging surface of the lens group 20. The imaging light can pass through the lens group 20 along the optical axis Z and be projected onto the optical sensing element 50. When the optical sensing element 50 detects the light and converts it into an electrical signal, the optical sensing element 50 transmits the electrical signal to other external components for subsequent processing. In other embodiments, the optical sensing element 50 may be omitted.

[0057] In addition, the first preferred embodiment also includes a microstructured optical component 200, which can be applied to the optical lens module 100. The microstructured optical component 200 is selected from one or a combination of the group consisting of the lens barrel 10, the plurality of lenses 21 and the equally spaced ring 30. This means that the lens barrel 10, the plurality of lenses 21 or the equally spaced ring 30 can be used as the microstructured optical component 200, or two or more combinations of the lens barrel 10, the plurality of lenses 21 and the equally spaced ring 30 can be used as the microstructured optical component 200. In the first embodiment, the microstructured optical component 200 is described with the lens barrel 10 as an example.

[0058] like Figure 1A As shown, the microstructured optical component 200 includes a low-reflection optical surface 210. In a preferred embodiment, when the lens barrel 10 is the microstructured optical component 200, the low-reflection optical surface 210 is located on the entire surface of the light-shielding ring 12 and the inner edge of the object-side opening 11, or the low-reflection optical surface 210 may also be located on one of the light-shielding ring 12 and the object-side opening 11. In another embodiment, when the plurality of lenses 21 are each the microstructured optical component 200, the low-reflection optical surface 210 is located... The optically ineffective region 21B of each of the lenses 21 is not limited thereto. In other embodiments, the lens 21 may be at least one of the microstructured optical components 200. In another embodiment, when the spaced ring 30 is the microstructured optical component 200, the low-reflection optical surface 210 is located on an inner ring surface 31 of the spaced ring 30, the inner ring surface 31 being surrounding the optical axis Z. However, this is not limited thereto. In other embodiments, the spaced ring 30 may be at least one of the microstructured optical components 200.

[0059] More specifically, the low-reflection optical surface 210 has a microstructure region 220, which is an area region of 0.3mm*0.3mm arbitrarily selected on the low-reflection optical surface 210. The microstructure region 220 defines a cross-section 230, which corresponds to the side length direction of the microstructure region 220, that is, the length of the cross-section 230 is 0.3mm. In the first embodiment, the cross-section of the microstructure region 220 is measured using a white light interferometer for planar analysis. 230, wherein multiple wave peaks P and multiple wave troughs C are distributed on the cross section 230, the cross section 230 defines a maximum wave height H and a virtual horizontal half-height line X, the maximum wave height H is the vertical distance between the highest wave peak Pt of the multiple wave peaks P and the lowest wave trough Ct of the multiple wave troughs C, the vertical distance between the virtual horizontal half-height line X and the highest wave peak Pt is half the distance of the maximum wave height H, and the virtual horizontal half-height line X is located between the highest wave peak Pt and the lowest wave trough Ct.

[0060] In addition, such as Figure 1B As shown, the plurality of peaks P includes at least one high peak P1 and at least one low peak P2. The position of the at least one high peak P1 is higher than the virtual horizontal half-height line X, and the position of the at least one low peak P2 is lower than the virtual horizontal half-height line X. Figure 1B As shown, in the first embodiment, there are multiple high-level peaks P1 and one low-level peak P2, wherein the highest peak Pt is located at the highest position among the multiple high-level peaks P1; the multiple troughs C include at least one high-level trough C1 and at least one low-level trough C2, the position of the at least one high-level trough C1 is higher than the virtual horizontal half-height line X, and the position of the at least one low-level trough C2 is lower than the virtual horizontal half-height line X, as shown. Figure 1B As shown, in the first embodiment, there are multiple high-level valleys C1 and multiple low-level valleys C2, wherein the lowest valley Ct is located at the lowest position among the multiple low-level valleys C2.

[0061] To ensure that the microstructure region 220 has a good effect on eliminating scattered light, in the first embodiment, the cross section 230 meets the following condition:

[0062] (1) 0.05% ≤ R ≤ 2.00%;

[0063] (2) NP2≤NP1;

[0064] (3) NC1≤NC2

[0065] (4) D≥1 / 2H;

[0066] (5) d≤1 / 10H;

[0067] (6) 2μm≤Sa≤3μm;

[0068] (7) 5≤NP1≤20;

[0069] (8) 5≤NC2≤20.

[0070] Where H is the maximum wave height; NP1 is the number of the plurality of high-level wave peaks P1 in the cross section 230; NP2 is the number of the plurality of low-level wave peaks P2 in the cross section 230; d is the minimum vertical distance between the low-level wave peak P2 and the adjacent wave valley C; Sa is the surface roughness of the microstructure region 220; R is the surface reflectivity of the cross section 230. When the low-reflectivity optical surface 210 is at a wavelength of 555nm, the cross section 230 satisfies the following condition: R ≤ 1.750%; where R is the surface reflectivity of the cross section 230; NC1 is the number of the plurality of high-level wave valleys C1 in the cross section 230; NC2 is the number of the plurality of low-level wave valleys C2 in the cross section 230; and D is the maximum vertical distance between each of the low-level wave valleys C2 and the adjacent wave peak P.

[0071] like Figure 1B , 1C As shown, the maximum wave height H of the cross section 230 is measured to be 15 μm. The number of high-level wave peaks P1 in the cross section 230 is NP1 = 13, the number of low-level wave peaks P2 in the cross section 230 is NP2 = 1, the number of high-level wave valleys C1 in the cross section 230 is NC1 = 5, the number of low-level wave valleys C2 in the cross section 230 is NC2 = 9, the surface roughness Sa of the microstructure region 220 is 2.594, and the surface reflectivity R of the cross section 230 is between 0.195% and 1.935%. When the low-reflectivity optical surface 210 is at a wavelength of 555 nm, the surface reflectivity R of the cross section 230 is 1.750%. The maximum vertical distance D between each low-level wave valley C2 and its adjacent wave peak P is ≥ 7.5 μm, and the minimum vertical distance d between each low-level wave peak P2 and its adjacent wave valley C is ≤ 1.5 μm. Therefore, the specific values ​​of the aforementioned conditional expression for the cross section 230 in the first embodiment are as follows:

[0072] (1) 0.195% ≤ R ≤ 1.935%;

[0073] (2) NP2≤NP1;

[0074] (3) NC1≤NC2

[0075] (4) D≥7.5μm;

[0076] (5) d≤1.5μm;

[0077] (6) Sa=2.594;

[0078] (7) NP1 = 13;

[0079] (8) NC2 = 9.

[0080] Thus, the first embodiment satisfies the conditions set at points (1) to (8) of the aforementioned cross section 230; thereby, the low-reflection optical surface 210 of the microstructured optical component 200 is designed with a microstructured region 220, the microstructured region 220 having irregularly arranged multiple high-position peaks P1, multiple high-position valleys C1, multiple low-position peaks P2 and multiple low-position valleys C2, effectively dispersing stray light, and the cross section 230 at least satisfies the conditions 0.05% ≤ R ≤ 2.00% and NP2 ≤ NP1, further providing a good effect of optimal stray light removal, wherein the microstructured optical component 200 can be applied to the optical lens module 100 of the first embodiment, so that the optical lens module 100 has the function of dispersing stray light, thereby achieving the purpose of eliminating stray light from entering the lens barrel 10.

[0081] Please refer to Figure 2A This is a microstructured optical component 300 of the second preferred embodiment of the present invention. The microstructured optical component 300 is applied to the optical lens module 100 of the first embodiment. The microstructured optical component 300 may also be selected from one or a combination of the group consisting of the lens barrel 10, the plurality of lenses 21 and the equally spaced rings 30.

[0082] The microstructured optical component 300 includes a low-reflection optical surface (not shown) located on the surface of the lens barrel 10, each of the lenses 21, or each of the spacer rings 30. The low-reflection optical surface has a microstructure region 320, which is an area region of 0.3mm*0.3mm arbitrarily selected on the low-reflection optical surface. The microstructure region 320 defines a cross section 330, which corresponds to the side length direction of the microstructure region 320. In the second embodiment, the cross section 330 of the microstructure region 320 is measured using a white light interferometer for planar analysis.

[0083] like Figure 2AAs shown, multiple wave peaks P and multiple wave troughs C are distributed on the cross section 330. The cross section 330 defines a maximum wave height H and a virtual horizontal half-height line X. The maximum wave height H is the vertical distance between the highest wave peak Pt of the multiple wave peaks P and the lowest wave trough Ct of the multiple wave troughs C. The vertical distance between the virtual horizontal half-height line X and the highest wave peak Pt is half the distance of the maximum wave height H, and the virtual horizontal half-height line X is located between the highest wave peak Pt and the lowest wave trough Ct.

[0084] Furthermore, the plurality of peaks P includes at least one high peak P1 and at least one low peak P2. The position of the at least one high peak P1 is higher than the virtual horizontal half-height line X, and the position of the at least one low peak P2 is lower than the virtual horizontal half-height line X. In the second embodiment, the number of the at least one high peak P1 is multiple, and the number of the at least one low peak P2 is one. The highest peak Pt is located at the highest position among the plurality of high peaks P1. The plurality of valleys C includes at least one high valley C1 and at least one low valley C2. The position of the at least one high valley C1 is higher than the virtual horizontal half-height line X, and the position of the at least one low valley C2 is lower than the virtual horizontal half-height line X. In the second embodiment, the number of the at least one high valley C1 and the number of the at least one low valley C2 are both multiple. The lowest valley Ct is located at the lowest position among the plurality of low valleys C2.

[0085] To ensure that the microstructure region 320 has a good effect on eliminating scattered light, in the second embodiment, the cross section 330 meets the following condition:

[0086] (1) 0.05% ≤ R ≤ 2.00%;

[0087] (2) NP2≤NP1;

[0088] (3) NC1≤NC2

[0089] (4) D≥1 / 2H;

[0090] (5) d≤1 / 10H;

[0091] (6) 2μm≤Sa≤3μm;

[0092] (7) 5≤NP1≤20;

[0093] (8) 5≤NC2≤20.

[0094] Where H is the maximum wave height; NP1 is the number of the plurality of high-level wave peaks P1 at the cross section 330; NP2 is the number of the plurality of low-level wave peaks P2 at the cross section 330; d is the minimum vertical distance between the low-level wave peak P2 and the adjacent wave valley C; Sa is the surface roughness of the microstructure region 320; R is the surface reflectivity of the cross section 330. When the low-reflectivity optical surface is at a wavelength of 555nm, the cross section 330 satisfies the following condition: R≤1.750%; where R is the surface reflectivity of the cross section 330; NC1 is the number of the plurality of high-level wave valleys C1 at the cross section 330; NC2 is the number of the plurality of low-level wave valleys C2 at the cross section 330; and D is the maximum vertical distance between each of the low-level wave valleys C2 and the adjacent wave peak P.

[0095] like Figure 2A , 2B As shown, the maximum wave height H of the cross section 330 is measured to be 16 μm. The number of high-level wave peaks P1 in the cross section 330 is NP1 = 13, the number of low-level wave peaks P2 in the cross section 330 is NP2 = 1, the number of high-level wave valleys C1 in the cross section 330 is NC1 = 5, the number of low-level wave valleys C2 in the cross section 330 is NC2 = 9, the surface roughness Sa of the microstructure region 320 is 2.581, and the surface reflectivity R of the cross section 330 is between 0.180% and 1.875%. When the low-reflectivity optical surface is at a wavelength of 555 nm, the surface reflectivity R of the cross section 330 is 1.655%. The maximum vertical distance D between each low-level wave valley C2 and its adjacent wave peak P is ≥ 8.0 μm, and the minimum vertical distance d between each low-level wave peak P2 and its adjacent wave valley C is ≤ 1.6 μm. Therefore, the specific values ​​of the aforementioned conditional expression for the cross section 330 in the second embodiment are as follows:

[0096] (1) 0.180% ≤ R ≤ 1.875%;

[0097] (2) NP2≤NP1;

[0098] (3) NC1≤NC2

[0099] (4) D≥8.0μm;

[0100] (5) d≤1.6μm;

[0101] (6) Sa=2.581;

[0102] (7) NP1 = 13;

[0103] (8) NC2 = 9.

[0104] Thus, the second embodiment satisfies the conditional expressions set at points (1) to (8) of the aforementioned section 330; thereby, the microstructured optical component 300 with the microstructured region 320 design can effectively disperse stray light and provide a good effect of optimal stray light removal. Furthermore, the microstructured optical component 300 is applied to the optical lens module 100 of the first embodiment, so that the optical lens module 100 has the function of dispersing stray light and achieves the purpose of eliminating stray light from entering the lens barrel 10.

[0105] Please refer to Figure 3A This is a microstructured optical component 400 in the third preferred embodiment of the present invention. The microstructured optical component 400 is applied to the optical lens module 100 of the first embodiment. The microstructured optical component 400 may also be selected from one or a combination of the group consisting of the lens barrel 10, the plurality of lenses 21 and the equally spaced rings 30.

[0106] The microstructured optical component 400 includes a low-reflection optical surface (not shown) located on the surface of the lens barrel 10, each of the lenses 21, or each of the spacer rings 30. The low-reflection optical surface has a microstructure region 420, which is an area region of 0.3mm*0.3mm arbitrarily selected on the low-reflection optical surface. The microstructure region 420 defines a cross section 430, which corresponds to the side length direction of the microstructure region 420. In the third embodiment, the cross section 430 of the microstructure region 420 is measured using a white light interferometer for planar analysis.

[0107] like Figure 3A As shown, multiple wave peaks P and multiple wave troughs C are distributed on the cross section 430. The cross section 430 defines a maximum wave height H and a virtual horizontal half-height line X. The maximum wave height H is the vertical distance between the highest wave peak Pt of the multiple wave peaks P and the lowest wave trough Ct of the multiple wave troughs C. The vertical distance between the virtual horizontal half-height line X and the highest wave peak Pt is half the distance of the maximum wave height H, and the virtual horizontal half-height line X is located between the highest wave peak Pt and the lowest wave trough Ct.

[0108] Furthermore, the plurality of peaks P includes at least one high peak P1 and at least one low peak P2. The position of the at least one high peak P1 is higher than the virtual horizontal half-height line X, and the position of the at least one low peak P2 is lower than the virtual horizontal half-height line X. In the third embodiment, the number of the at least one high peak P1 is multiple, and the number of the at least one low peak P2 is two. The highest peak Pt is located at the highest position among the plurality of high peaks P1. The plurality of valleys C includes at least one high valley C1 and at least one low valley C2. The position of the at least one high valley C1 is higher than the virtual horizontal half-height line X, and the position of the at least one low valley C2 is lower than the virtual horizontal half-height line X. In the third embodiment, the number of the at least one high valley C1 is one, and the number of the at least one low valley C2 is multiple. The lowest valley Ct is located at the lowest position among the plurality of low valleys C2.

[0109] To ensure that the microstructure region 420 has a good effect on eliminating scattered light, in the third embodiment, the cross section 430 meets the following condition:

[0110] (1) 0.05% ≤ R ≤ 2.00%;

[0111] (2) NP2≤NP1;

[0112] (3) NC1≤NC2

[0113] (4) D≥1 / 2H;

[0114] (5) d≤1 / 10H;

[0115] (6) 2μm≤Sa≤3μm;

[0116] (7) 5≤NP1≤20;

[0117] (8) 5≤NC2≤20.

[0118] Where H is the maximum wave height; NP1 is the number of the plurality of high-level wave peaks P1 at the cross section 430; NP2 is the number of the plurality of low-level wave peaks P2 at the cross section 430; d is the minimum vertical distance between the low-level wave peak P2 and the adjacent wave valley C; Sa is the surface roughness of the microstructure region 420; R is the surface reflectivity of the cross section 430. When the low-reflectivity optical surface is at a wavelength of 555nm, the cross section 430 satisfies the following condition: R≤1.750%; where R is the surface reflectivity of the cross section 430; NC1 is the number of the plurality of high-level wave valleys C1 at the cross section 430; NC2 is the number of the plurality of low-level wave valleys C2 at the cross section 430; and D is the maximum vertical distance between each of the low-level wave valleys C2 and the adjacent wave peak P.

[0119] like Figure 3A , 3B As shown, the maximum wave height H of the cross section 430 is measured to be 13 μm. The number of high-level wave peaks P1 in the cross section 430 is NP1 = 11, the number of low-level wave peaks P2 in the cross section 430 is NP2 = 2, the number of high-level wave valleys C1 in the cross section 430 is NC1 = 1, the number of low-level wave valleys C2 in the cross section 430 is NC2 = 12, the surface roughness Sa of the microstructure region 420 is 2.566, and the surface reflectivity R of the cross section 430 is between 0.155% and 1.770%. When the low-reflectivity optical surface is at a wavelength of 555 nm, the surface reflectivity R of the cross section 430 is 1.570%. The maximum vertical distance D between each low-level wave valley C2 and its adjacent wave peak P is ≥ 6.5 μm, and the minimum vertical distance d between each low-level wave peak P2 and its adjacent wave valley C is ≤ 1.3 μm. Therefore, the specific values ​​of the aforementioned conditional expression for the cross section 430 in the third embodiment are as follows:

[0120] (1) 0.155% ≤ R ≤ 1.770%;

[0121] (2) NP2≤NP1;

[0122] (3) NC1≤NC2

[0123] (4) D≥6.5μm;

[0124] (5) d≤1.3μm;

[0125] (6) Sa=2.566;

[0126] (7) NP1 = 11;

[0127] (8) NC2 = 12.

[0128] Thus, the third embodiment satisfies the conditional expressions set at points (1) to (8) of the aforementioned section 430; thereby, the design of the microstructured optical component 400 with the microstructured region 420 can effectively disperse stray light and provide a good effect of optimal stray light removal. Furthermore, the microstructured optical component 400 is applied to the optical lens module 100 of the first embodiment, so that the optical lens module 100 has the function of dispersing stray light and achieves the purpose of eliminating stray light from entering the lens barrel 10.

[0129] Please refer to Figure 4A This is a microstructured optical component 500 in the fourth preferred embodiment of the present invention. The microstructured optical component 500 is applied to the optical lens module 100 of the first embodiment mentioned above. The microstructured optical component 500 can also be selected from one or a combination of the group consisting of the lens barrel 10, the plurality of lenses 21 and the equally spaced rings 30.

[0130] The microstructured optical component 500 includes a low-reflection optical surface (not shown) located on the surface of the lens barrel 10, each of the lenses 21, or each of the spacer rings 30. The low-reflection optical surface has a microstructure region 520, which is an area region of 0.3mm*0.3mm arbitrarily selected on the low-reflection optical surface. The microstructure region 520 defines a cross section 530, which corresponds to the side length direction of the microstructure region 520. In the fourth embodiment, the cross section 530 of the microstructure region 520 is measured using a white light interferometer for planar analysis.

[0131] like Figure 4A As shown, multiple wave peaks P and multiple wave troughs C are distributed on the cross section 530. The cross section 530 defines a maximum wave height H and a virtual horizontal half-height line X. The maximum wave height H is the vertical distance between the highest wave peak Pt of the multiple wave peaks P and the lowest wave trough Ct of the multiple wave troughs C. The vertical distance between the virtual horizontal half-height line X and the highest wave peak Pt is half the distance of the maximum wave height H, and the virtual horizontal half-height line X is located between the highest wave peak Pt and the lowest wave trough Ct.

[0132] Furthermore, the plurality of peaks P includes at least one high peak P1 and at least one low peak P2. The position of the at least one high peak P1 is higher than the virtual horizontal half-height line X, and the position of the at least one low peak P2 is lower than the virtual horizontal half-height line X. In the fourth embodiment, the number of the at least one high peak P1 is multiple, and the number of the at least one low peak P2 is four. The highest peak Pt is located at the highest position among the plurality of high peaks P1. The plurality of valleys C includes at least one high valley C1 and at least one low valley C2. The position of the at least one high valley C1 is higher than the virtual horizontal half-height line X, and the position of the at least one low valley C2 is lower than the virtual horizontal half-height line X. In the fourth embodiment, the number of the at least one high valley C1 is one, and the number of the at least one low valley C2 is multiple. The lowest valley Ct is located at the lowest position among the plurality of low valleys C2.

[0133] To ensure that the microstructure region 520 has a good effect on eliminating scattered light, in the fourth embodiment, the cross section 530 meets the following condition:

[0134] (1) 0.05% ≤ R ≤ 2.00%;

[0135] (2) NP2≤NP1;

[0136] (3) NC1≤NC2

[0137] (4) D≥1 / 2H;

[0138] (5) d≤1 / 10H;

[0139] (6) 2μm≤Sa≤3μm;

[0140] (7) 5≤NP1≤20;

[0141] (8) 5≤NC2≤20.

[0142] Where H is the maximum wave height; NP1 is the number of the plurality of high-level wave peaks P1 in the cross section 530; NP2 is the number of the plurality of low-level wave peaks P2 in the cross section 530; d is the minimum vertical distance between the low-level wave peak P2 and the adjacent wave valley C; Sa is the surface roughness of the microstructure region 520; R is the surface reflectivity of the cross section 530. When the low-reflectivity optical surface is at a wavelength of 555nm, the cross section 530 satisfies the following condition: R≤1.750%; where R is the surface reflectivity of the cross section 530; NC1 is the number of the plurality of high-level wave valleys C1 in the cross section 530; NC2 is the number of the plurality of low-level wave valleys C2 in the cross section 530; and D is the maximum vertical distance between each of the low-level wave valleys C2 and the adjacent wave peak P.

[0143] like Figure 4A , 4B As shown, the maximum wave height H = 10.5 μm was measured at section 530. The number of high-level wave peaks P1 in section 530 is NP1 = 12, the number of low-level wave peaks P2 in section 530 is NP2 = 4, the number of high-level wave valleys C1 in section 530 is NC1 = 1, the number of low-level wave valleys C2 in section 530 is NC2 = 14, and the surface roughness Sa of the microstructure region 520 is 2.518. The surface reflectivity R of the low-reflectivity optical surface is between 0.115% and 1.705%, wherein when the low-reflectivity optical surface is at a wavelength of 555nm, the surface reflectivity R of the cross section 530 is 1.435%, the maximum vertical distance D between each low-position valley C2 and the adjacent wave peak P is ≥ 5.25μm, and the minimum vertical distance d between the low-position wave peak P2 and the adjacent valley C is ≤ 1.05μm; therefore, the specific values ​​of the aforementioned conditional expression for the cross section 530 in the fourth embodiment are as follows:

[0144] (1) 0.115% ≤ R ≤ 1.705%;

[0145] (2) NP2≤NP1;

[0146] (3) NC1≤NC2

[0147] (4) D≥5.25μm;

[0148] (5) d≤1.05μm;

[0149] (6) Sa=2.518;

[0150] (7) NP1 = 12;

[0151] (8) NC2 = 14.

[0152] Thus, the fourth embodiment satisfies the conditional expressions set at points (1) to (8) of the aforementioned section 530; thereby, the design of the microstructured optical component 500 with the microstructured region 520 can effectively disperse stray light and provide a good effect of optimal stray light removal. Furthermore, the microstructured optical component 500 is applied to the optical lens module 100 of the first embodiment, so that the optical lens module 100 has the function of dispersing stray light and achieves the purpose of eliminating stray light from entering the lens barrel 10.

[0153] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A microstructured optical component, said microstructured optical component being selected from one or a combination thereof of a group consisting of a lens barrel, a lens, and a spacer ring, characterized in that, The microstructured optical component includes: A low-reflection optical surface has a microstructure region, which is an area area of ​​0.3mm x 0.3mm arbitrarily selected on the low-reflection optical surface. The microstructure region defines a cross-section corresponding to the side length direction of the microstructure region. Multiple peaks and troughs are distributed on the cross-section. The cross-section defines a maximum peak height and a virtual horizontal half-height line. The maximum peak height is the vertical distance between the highest peak and the lowest trough among the multiple peaks. The vertical distance between the virtual horizontal half-height line and the highest peak is half the maximum peak height distance, and the virtual horizontal half-height line is located between the highest peak and the lowest trough. The multiple peaks include at least one high-position peak and at least one low-position peak. The position of the at least one high-position peak is above the virtual horizontal half-height line, and the position of the at least one low-position peak is below the virtual horizontal half-height line. The cross-section satisfies the following condition: 0.05% ≤ R ≤ 2.00%; and NP2≤NP1; where R is the surface reflectivity of the cross section; NP1 is the number of the at least one high-level wave peaks at the cross section; and NP2 is the number of the at least one low-level wave peaks at the cross section.

2. The microstructured optical component as described in claim 1, wherein, The cross section satisfies the following condition: d≤1 / 10H, wherein the maximum wave height distance is defined as H, and d is the minimum vertical distance between the at least one low-level wave peak and the adjacent wave trough.

3. The microstructured optical component as described in claim 1, wherein, The microstructure region satisfies the following condition: 2μm≤Sa≤3μm; where Sa is the surface roughness of the microstructure region.

4. The microstructured optical component as described in claim 1, wherein, The cross section satisfies the following condition: 5≤NP1≤20.

5. The microstructured optical component as described in claim 1, wherein, The cross section satisfies the following condition: 0.195% ≤ R ≤ 1.935%; Where R is the surface reflectivity of the cross section.

6. The microstructured optical component as described in claim 5, wherein, When the low-reflection optical surface is subjected to a wavelength of 555 nm, the cross-section satisfies the following condition: R ≤ 1.750%; Where R is the surface reflectivity of the cross section.

7. The microstructured optical component as claimed in claim 1, wherein, The plurality of valleys includes at least one high valley and at least one low valley. The position of the at least one high valley is higher than the virtual horizontal half-height line, and the position of the at least one low valley is lower than the virtual horizontal half-height line. The cross section satisfies the following condition: NC1≤NC2. Wherein NC1 is the number of at least one high-level valleys in the cross section, and NC2 is the number of at least one low-level valleys in the cross section.

8. The microstructured optical component as claimed in claim 7, wherein, The cross section satisfies the following condition: D≥1 / 2H, wherein the maximum wave height distance is defined as H, and the at least one low-position wave valley is multiple, and D is the maximum vertical distance between each low-position wave valley and the adjacent wave peak.

9. The microstructured optical component as claimed in claim 7, wherein, The cross section satisfies the following condition: 5≤NC2≤20.

10. An optical lens module, comprising: A microscope tube with an object-side opening; A lens group, wherein the lens group is disposed inside the lens barrel, and the lens group comprises a plurality of lenses extending from the object side to the image side along an optical axis from the object side opening; and An aperture is installed inside the lens barrel, and the aperture is located between the object side and the image side; A spacer ring is installed inside the lens barrel, the spacer ring is surrounding the optical axis and disposed on one side of the object side or image side of one of the lenses; wherein the lens barrel, the plurality of lenses and the spacer ring, or a combination thereof, is a microstructured optical component as described in any one of claims 1 to 9.

11. The optical lens module as claimed in claim 10, wherein, When the lens barrel is the microstructured optical component, the lens barrel has a light-shielding ring that surrounds the optical axis, the object-side opening is located inside the light-shielding ring, and the low-reflection optical surface is located on the overall surface of the light-shielding ring.

12. The optical lens module as claimed in claim 10, wherein, When the lens barrel is the microstructured optical component, the low-reflection optical surface is located at the inner edge of the object-side opening.

13. The optical lens module as claimed in claim 10, wherein, When the lens barrel is the microstructured optical component, the lens barrel has a light-shielding ring that surrounds the optical axis, the object-side opening is located inside the light-shielding ring, and the low-reflection optical surface is located on the overall surface of the light-shielding ring and the inner edge of the object-side opening.

14. The optical lens module as claimed in claim 10, wherein, When the plurality of lenses are the microstructured optical components, each lens has an optically effective region and an optically ineffective region. The optically effective region corresponds to the position of the object-side aperture, the optical axis passes through the optically effective region, and the optically ineffective region surrounds the optically effective region. The low-reflection optical surface is located in the optically ineffective region of the lens.

15. The optical lens module as claimed in claim 10, wherein, When the spacer ring is the microstructured optical component, the low-reflection optical surface is located on an inner ring surface of the spacer ring, which surrounds the optical axis.

16. The optical lens module as claimed in any one of claims 10 to 15, wherein, It also includes an optical sensing element disposed inside the lens barrel and located on an imaging surface of the lens group.

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