Miniature optical lens, imaging device and electronic device

Abstract

The present disclosure relates to a micro optical lens, an imaging device and an electronic device. A micro optical lens comprises an optical element. The optical element comprises a low reflection layer. The low reflection layer is located on at least one surface of the optical element, the low reflection layer is formed by roughening and crystallization, and the low reflection layer comprises a plurality of nanocrystals located on one surface of the low reflection layer. When certain conditions are met, it helps to destroy and weaken the intensity of stray light incident on the surface, helps to maintain the ultra-low reflectivity of the surface of the optical element, and significantly improves the optical imaging quality of the micro optical lens.

Description

[0001] This application is a divisional application of a patent application with an application date of November 29, 2019, application number 201911196380.X, and invention name “Micro optical lens, imaging device and electronic device”. Technical Field

[0002] The invention relates to an optical lens, in particular to a micro optical lens comprising an optical element. Background Art

[0003] In recent years, it has become increasingly popular to use micro-optical lenses in mobile devices to take photos. However, mobile devices are often used outdoors and are affected by strong sunlight, which causes the optical lenses to be affected by strong non-imaging stray light and significantly reduces the image quality.

[0004] Conventional technologies use ink coating, sandblasting and coating on the surface of opaque optical elements in optical lenses to reduce reflectivity and eliminate stray light. Although this can improve the quality of optical imaging, it is still not enough to eliminate high-intensity stray light. In addition, there are other technologies for reducing reflectivity in the field of non-mobile device optical lenses. These technologies produce a microstructure with multiple holes by manufacturing the surface of the film layer. However, their structural support is insufficient and the film layer is easily deformed by external forces, which greatly reduces the anti-reflection effect.

[0005] In addition, although there is a known technology that uses multi-layer coating to achieve a better anti-reflection effect, the multi-layer production process is relatively complicated and the coating cost is high, making it unable to be widely used in the optical lens industry. Summary of the invention

[0006] The micro optical lens, imaging device and electronic device provided by the present invention provide a low reflection layer on at least one surface of an optical element, which helps to maintain the ultra-low reflectivity of the surface of the optical element, thereby effectively improving the optical imaging quality of the micro optical lens.

[0007] According to the present invention, a micro optical lens is provided, comprising an optical element. The optical element comprises a low-reflection layer. The low-reflection layer is located on at least one surface of the optical element, wherein the low-reflection layer is formed by roughening and crystallization, and the low-reflection layer comprises a plurality of nanocrystalline grains, which are located on a surface of the low-reflection layer, and the material of the plurality of nanocrystalline grains is SiO2. The reflectivity of the low-reflection layer at a wavelength of 380nm-780nm is R3878, and the average grain size of the plurality of nanocrystalline grains is DC, which satisfies the following conditions:

[0008] R3878 ≤ 0.50%; and

[0009] 20nm≤DC≤200nm.

[0010] According to the present invention, there is also provided an image capturing device, comprising the micro optical lens as described in the previous paragraph and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the micro optical lens.

[0011] According to the present invention, an electronic device is further provided, comprising the imaging device as described in the preceding paragraph.

[0012] When R3878 meets the above conditions, it helps to destroy and weaken the intensity of stray light incident on the surface, helps maintain the ultra-low reflectivity of the surface of the optical element, and significantly improves the optical imaging quality of the micro-optical lens.

[0013] When DC meets the above conditions, the average particle size of the nanocrystals is appropriately controlled. Large particles help to enhance the height difference of the surface, while small particles can create a better stray light reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0015] Figure 1 Graphs show the reflectivity values ​​of the low reflection layer in the first to tenth embodiments of the present invention at wavelengths of 380nm-780nm;

[0016] Figure 1-1 is a crystal surface diagram of the first embodiment of the present invention;

[0017] Figure 1-2 is a crystal surface diagram of a second embodiment of the present invention;

[0018] Figure 1-3 A crystal surface diagram of a third embodiment of the present invention;

[0019] Figure 1-4 A crystal surface diagram of a fourth embodiment of the present invention;

[0020] Figure 1-5 is a crystal surface diagram of a fifth embodiment of the present invention;

[0021] Figure 1-6 A crystal surface diagram of a sixth embodiment of the present invention;

[0022] Figure 1-7 is a crystal surface diagram of the seventh embodiment of the present invention;

[0023] Figure 1-8 is a crystal surface diagram of an eighth embodiment of the present invention;

[0024] Figure 1-9 is a crystal surface diagram of a ninth embodiment of the present invention;

[0025] Figure 1-10 is a crystal surface diagram of the tenth embodiment of the present invention;

[0026] Figure 2 Graphs show the reflectivity values ​​of the low reflection layer in the eleventh to twentieth embodiments of the present invention at wavelengths of 380nm-780nm;

[0027] Figure 2-1 is a crystal surface diagram of the eleventh embodiment of the present invention;

[0028] Figure 2-2 is a crystal surface diagram of the twelfth embodiment of the present invention;

[0029] Figure 2-3 is a crystal surface diagram of the thirteenth embodiment of the present invention;

[0030] Figure 2-4 is a crystal surface diagram of a fourteenth embodiment of the present invention;

[0031] Figure 2-5 is a crystal surface diagram of the fifteenth embodiment of the present invention;

[0032] Figure 2-6 is a crystal surface diagram of the sixteenth embodiment of the present invention;

[0033] Figure 2-7 is a crystal surface diagram of the seventeenth embodiment of the present invention;

[0034] Figure 2-8 is a crystal surface diagram of the eighteenth embodiment of the present invention;

[0035] Figure 2-9 is a crystal surface diagram of the nineteenth embodiment of the present invention;

[0036] Figure 2-10 is a crystal surface diagram of the twentieth embodiment of the present invention;

[0037] Figure 3 Graphs show the reflectivity values ​​of the low reflection layer in the 21st to 30th embodiments of the present invention at wavelengths of 380nm-780nm;

[0038] Figure 3-1 is a crystal surface diagram of the twenty-first embodiment of the present invention;

[0039] Figure 3-2 is a crystal surface diagram of the twenty-second embodiment of the present invention;

[0040] Figure 3-3 is a crystal surface diagram of the twenty-third embodiment of the present invention;

[0041] Figure 3-4 is a crystal surface diagram of the twenty-fourth embodiment of the present invention;

[0042] Figure 3-5 is a crystal surface diagram of the twenty-fifth embodiment of the present invention;

[0043] Figure 3-6 is a crystal surface diagram of the twenty-sixth embodiment of the present invention;

[0044] Figure 3-7 is a crystal surface diagram of the twenty-seventh embodiment of the present invention;

[0045] Figure 3-8 is a crystal surface diagram of the twenty-eighth embodiment of the present invention;

[0046] Figure 3-9 is a crystal surface diagram of the twenty-ninth embodiment of the present invention;

[0047] Figure 3-10 is a crystal surface diagram of the thirtieth embodiment of the present invention;

[0048] Figure 4 is a graph showing the relationship between the value of the parameter R3878 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0049] Figure 5 is a graph showing the relationship between the value of the parameter R3850 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0050] Figure 6 is a graph showing the relationship between the value of the parameter R4070 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0051] Figure 7 is a graph showing the relationship between the value of the parameter R4055 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0052] Figure 8 is a graph showing the relationship between the value of the parameter R4565 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0053] Fig. 9 is a graph showing the relationship between the value of parameter R5058 and the average particle size of nanocrystals in the first to thirtieth embodiments of the present invention;

[0054] Fig.10 is a graph showing the relationship between the value of the parameter R5570 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0055] Fig.11 is a graph showing the relationship between the value of the parameter R5878 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention;

[0056] Fig.12 is a cross-sectional view of a micro-optical lens according to a thirty-first embodiment of the present invention;

[0057] Fig.13A is a schematic diagram illustrating an electronic device according to a thirty-second embodiment of the present invention;

[0058] Fig. 13B It is shown Fig.13A Another schematic diagram of an electronic device;

[0059] Fig. 13C It is shown Fig.13A A schematic diagram of components of an electronic device;

[0060] Fig.13D It is shown Fig.13A A block diagram of an electronic device;

[0061] Fig.14 is a schematic diagram illustrating an electronic device according to a thirty-third embodiment of the present invention;

[0062] Fig.15 is a schematic diagram illustrating an electronic device according to a thirty-fourth embodiment of the present invention; and

[0063] Fig.16 It is a schematic diagram of an electronic device according to the thirty-fifth embodiment of the present invention.

[0064]

Explanation of symbols

[0065] 12, 100…Micro optical lens

[0066] 10, 20, 30, 40…electronic devices

[0067] 11, 21, 31, 41…imaging device

[0068] 13…Electronic photosensitive element

[0069] 14, 24…Optical image stabilization components

[0070] 15…Auxiliary optics

[0071] 15a, 25a…Flash module

[0072] 15b, 25b…focus assist module

[0073] 16…Sensing element

[0074] 17a…Flexible printed circuit board

[0075] 17b… Connector

[0076] 18, 28…Imaging signal processing element

[0077] 19…User Interface

[0078] 19a…Touch screen

[0079] 19b…button

[0080] 110…Shading element

[0081] 120…Annular spacer element

[0082] 130…Tube element

[0083] DC…average particle size of nanocrystals

[0084] R3878…Reflectivity of low reflection layer at wavelength 380nm-780nm

[0085] R3850…Reflectivity of low reflection layer at wavelength 380nm-500nm

[0086] R4070…Reflectivity of low reflection layer at wavelength 400nm-700nm

[0087] R4055…Reflectivity of low reflection layer at wavelength 400nm-550nm

[0088] R4565…Reflectivity of low reflection layer at wavelength 450nm-650nm

[0089] R5058…Reflectivity of low reflection layer at wavelength 500nm-580nm

[0090] R5570…Reflectivity of low reflection layer at wavelength 550nm-700nm

[0091] R5878…Reflectivity of low reflection layer at wavelength 580nm-780nm DETAILED DESCRIPTION

[0092] The present invention provides a micro optical lens, comprising an optical element. The optical element comprises a low reflection layer, which is located on at least one surface of the optical element, and the low reflection layer comprises a plurality of nano crystals, which are located on one surface of the low reflection layer. The optical element is at least one of a light shielding element, a ring-shaped spacer element and a lens barrel element. The average particle size of the nano crystals is DC, and the reflectivity of the low reflection layer at a wavelength of 380nm-780nm is R3878, which satisfies the following conditions: 5nm≤DC≤200nm; and R3878≤0.50%.

[0093] In detail, the micro optical lens of the present invention sets a low reflection layer through at least one surface of its optical element, and the surface of the low reflection layer is roughened, and then a nucleation reaction (such as physical vapor deposition reaction, chemical vapor deposition reaction, vacuum evaporation, sputtering and ion plating, etc.) is carried out on the surface of the low reflection layer with an appropriate material, so as to form a surface structure with nano-crystallization through a crystallization process. Since the surface of the low reflection layer has nano-crystals with appropriate particle sizes, the intensity of stray light incident on the surface of the low reflection layer can be further destroyed and weakened, and the selection of nano-crystal materials with appropriate refractive index can make the refractive index between the surface of the optical element and the air reach a gradient distribution, so that the light can be incident smoothly but cannot be reflected, which helps to maintain the ultra-low reflectivity of the surface of the optical element, and significantly improves the optical imaging quality of the micro optical lens of the present invention. In this way, the micro optical lens of the present invention is suitable for application on the surface of the optical element composed of the optical lens of the mobile device, and has the cost advantage of significantly improving the optical imaging quality effect and wide application.

[0094] In the micro optical lens of the present invention, the material of the low reflection layer can be a dark coating with light absorption effect. The coating has the characteristics of being easy to apply and adhere to the surface of the element, making it suitable for mass processing and manufacturing, but the present invention is not limited thereto.

[0095] In the micro-optical lens of the present invention, the nano-crystalline material may be an oxide, such as SiO2, Al2O3, TiO2, Ta2O5, TeO2, ZnO, ZrO2, GeO2, MgO, etc.; the nano-crystalline material may also be a metal nitride, such as AlN, SiN, Si3N4, etc.; the nano-crystalline material may also be a metal fluoride, such as MgF2, CaF2, etc., but the present invention is not limited thereto. Preferably, the refractive index of the nano-crystal at a wavelength of 587.6nm is NC, which may satisfy the following conditions: NC≤2.1. Alternatively, it may satisfy the following conditions: NC≤1.9. Alternatively, it may satisfy the following conditions: NC≤1.8. Alternatively, it may satisfy the following conditions: NC≤1.7. Alternatively, it may satisfy the following conditions: NC≤1.6.

[0096] In the micro optical lens of the present invention, the shading element may be a dark-colored thin sheet in a circular shape and may be disposed on the object side or the image side of the optical lens to help absorb stray light, but the present invention is not limited thereto.

[0097] In the micro optical lens of the present invention, the annular spacer element can be disposed on the object side or the image side of the optical lens to provide a larger spacing between the optical lenses, thereby facilitating the adjustment of the appropriate spacing between the optical lenses and stabilizing the assembly of the optical lenses.

[0098] In the micro optical lens of the present invention, the lens barrel element may be a cylindrical shell that can carry the optical lens, the light shielding element and the annular spacer element, and has the function of fixing and protecting the internal elements, but the present invention is not limited thereto.

[0099] According to the micro-optical lens of the present invention, the average particle size of the nano-crystal is DC, which can meet the following conditions: 10nm≤DC≤150nm. In the micro-optical lens of the present invention, the average particle size of the nano-crystal is measured by observing the surface with an electron microscope, and selecting nano-crystal particles that meet the granular or spherical shape to measure the maximum diameter of a single particle, and measuring the average particle size of the nano-crystal at 1.2μm. 2 At least 5 nanocrystalline particles are selected within the area range to calculate the average particle size. Thereby, the average particle size of the nanocrystals is appropriately controlled. Large particles help to strengthen the height difference of the surface, and small particles can cause a better stray light reduction effect. Alternatively, it can meet the following conditions: 20nm≤DC≤150nm. Alternatively, it can meet the following conditions: 30nm≤DC≤125nm. Alternatively, it can meet the following conditions: 40nm≤DC≤100nm. Alternatively, it can meet the following conditions: 50nm≤DC≤75nm. Alternatively, it can meet the following conditions: 39nm≤DC≤88nm.

[0100] According to the micro optical lens of the present invention, the reflectivity of the low reflection layer at a wavelength of 380nm-780nm is R3878, which can meet the following conditions: R3878≤0.30%. In this way, stray light of a wide range of wavelengths can be absorbed, the ultra-low reflectivity of the surface can be maintained, and the imaging quality of the optical lens can be improved. Alternatively, it can meet the following conditions: R3878≤0.25%. Alternatively, it can meet the following conditions: R3878≤0.20%. Alternatively, it can meet the following conditions: R3878≤0.16%. Alternatively, it can meet the following conditions: R3878≤0.14%. Alternatively, it can meet the following conditions: R3878≤0.15%.

[0101] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 380nm-500nm is R3850, which can meet the following conditions: R3850≤0.40%. In this way, stray light in the short visible light wavelength range, such as stray light in the blue visible light wavelength range, can be effectively absorbed to maintain the low reflectivity of the surface in a specific wavelength range. Alternatively, it can meet the following conditions: R3850≤0.20%. Alternatively, it can meet the following conditions: R3850≤0.15%.

[0102] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 400nm-700nm is R4070, which can meet the following conditions: R4070≤0.50%. In this way, stray light in the visible light wavelength range can be effectively absorbed to maintain the ultra-low reflectivity of the surface. Alternatively, it can meet the following conditions: R4070≤0.25%. Alternatively, it can meet the following conditions: R4070≤0.20%.

[0103] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 400nm-550nm is R4055, which can meet the following conditions: R4055≤0.40%. In this way, stray light in the short visible light wavelength range, such as stray light in the blue visible light wavelength range, can be effectively absorbed to maintain the low reflectivity of the surface in a specific wavelength range. Alternatively, it can meet the following conditions: R4055≤0.20%. Alternatively, it can meet the following conditions: R4055≤0.15%.

[0104] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 450nm-650nm is R4565, which can meet the following conditions: R4565≤0.40%. In this way, stray light can be effectively absorbed to maintain the low reflectivity of the surface in a specific wavelength range. Alternatively, it can meet the following conditions: R4565≤0.20%. Alternatively, it can meet the following conditions: R4565≤0.15%.

[0105] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 500nm-580nm is R5058, which can meet the following conditions: R5058≤0.50%. In this way, stray light in a specific wavelength range, such as stray light in the green visible light wavelength range, can be effectively absorbed to maintain the low reflectivity of the surface. Alternatively, it can meet the following conditions: R5058≤0.25%. Alternatively, it can meet the following conditions: R5058≤0.20%.

[0106] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 550nm-700nm is R5570, which can meet the following conditions: R5570≤0.30%. In this way, stray light in the long visible light wavelength range, such as stray light in the red visible light wavelength range, can be effectively absorbed to maintain the low reflectivity of the surface in a specific wavelength range. Alternatively, it can meet the following conditions: R5570≤0.20%. Alternatively, it can meet the following conditions: R5570≤0.15%.

[0107] According to the micro optical lens of the present invention, the reflectivity of the low reflective layer at a wavelength of 580nm-780nm is R5878, which can meet the following conditions: R5878≤0.80%. In this way, stray light in the long visible light wavelength range, such as stray light in the red visible light and near infrared light wavelength range, can be effectively absorbed to maintain the low reflectivity of the surface in a specific wavelength range. Alternatively, it can meet the following conditions: R5878≤0.40%. Alternatively, it can meet the following conditions: R5878≤0.20%.

[0108] According to the micro optical lens of the present invention, the material of the nano crystal can be a metal oxide, thereby significantly reducing the reflectivity, and the specific material can further increase the surface hardness to improve the wear resistance.

[0109] According to the micro optical lens of the present invention, the material of the nano crystal can be SiO2, thereby changing the surface refractive index, so that the surface of the optical element and the air have a gradient refractive index, thereby significantly reducing the reflectivity of the surface.

[0110] According to the micro optical lens of the present invention, the material of the nano crystal can be Al2O3, thereby changing the surface refractive index, so that the surface of the optical element and the air have a gradient refractive index, thereby significantly reducing the reflectivity of the surface.

[0111] According to the micro optical lens of the present invention, the material of the nano crystals can be TiO2, thereby reducing the reflectivity of the surface.

[0112] According to the micro optical lens of the present invention, the material of the nano crystals can be metal nitride, thereby having the effect of reducing the reflectivity and further increasing the surface hardness to improve the wear resistance.

[0113] The various technical features of the micro-optical lens of the present invention can be configured in combination to achieve corresponding effects.

[0114] The present invention provides an imaging device, comprising the aforementioned micro optical lens and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of the micro optical lens. Preferably, the imaging device may further comprise a barrel member, a holder member or a combination thereof.

[0115] The present invention provides an electronic device, which includes the above-mentioned imaging device. Thereby, the imaging quality can be effectively improved. Preferably, the electronic device can further include but not limited to a control unit (Control Unit), a display unit (Display), a storage unit (Storage Unit), a random access memory (RAM), a read-only storage unit (ROM) or a combination thereof.

[0116] According to the above implementation modes, specific embodiments are proposed below and described in detail with reference to the accompanying drawings.

[0117] <First to Tenth Embodiments>

[0118] Please refer to Figures 1 to 1-10 , Figure 1 The reflectivity values ​​of the low reflection layer in the first embodiment to the tenth embodiment of the present invention at a wavelength of 380nm-780nm are shown. Figure 1-1 is a crystal surface diagram of the first embodiment of the present invention, Figure 1-2 is a crystal surface diagram of the second embodiment of the present invention, Figure 1-3 This is a crystal surface diagram of the third embodiment of the present invention. Figure 1-4 This is a crystal surface diagram of the fourth embodiment of the present invention. Figure 1-5 This is a crystal surface diagram of the fifth embodiment of the present invention. Figure 1-6 This is a crystal surface diagram of the sixth embodiment of the present invention. Figure 1-7 This is a crystal surface diagram of the seventh embodiment of the present invention. Figure 1-8 This is a crystal surface diagram of the eighth embodiment of the present invention. Figure 1-9 is a crystal surface diagram of the ninth embodiment of the present invention, and Figure 1-10 This is a crystal surface diagram of the tenth embodiment of the present invention.

[0119] In the nanocrystals of the first to tenth embodiments, the material of the nanocrystals is SiO2, and Figure 1-1 to Figure 1-10 The size ratios are all about 0.95μm in width, 1.27μm in length, and 1.2μm in total area. 2 .

[0120] Please refer to Table 1 below.

[0121]

[0122] Table 1 shows the values ​​of various parameters in the optical element of the micro-optical lens in the first embodiment to the tenth embodiment of the present invention, wherein Em1 to Em10 represent the first embodiment to the tenth embodiment in sequence, DC is the average particle size of the nanocrystal, R3878 is the reflectivity of the low reflection layer at a wavelength of 380nm-780nm, R3850 is the reflectivity of the low reflection layer at a wavelength of 380nm-500nm, R4070 is the reflectivity of the low reflection layer at a wavelength of 400nm-700nm, R4055 is the reflectivity of the low reflection layer at a wavelength of 400nm-550nm, R4565 is the reflectivity of the low reflection layer at a wavelength of 450nm-650nm, R5058 is the reflectivity of the low reflection layer at a wavelength of 500nm-580nm, R5570 is the reflectivity of the low reflection layer at a wavelength of 550nm-700nm, and R5878 is the reflectivity of the low reflection layer at a wavelength of 580nm-780nm.

[0123] Please refer to the following Table 2, which shows the reflectivity values ​​of the low reflection layers of the first embodiment to the tenth embodiment of the present invention at wavelengths of 380nm-780nm.

[0124]

[0125]

[0126]

[0127] The definitions of the data in the tables of the following embodiments are the same as those in Tables 1 and 2, and will not be repeated hereafter.

[0128] <Eleventh to Twentieth Embodiments>

[0129] Please refer to Figure 2 to Figure 2-10 , Figure 2 Graphs show the reflectivity values ​​of the low reflection layer in the eleventh to twentieth embodiments of the present invention at wavelengths of 380 nm to 780 nm. Figure 2-1 is a crystal surface diagram of the eleventh embodiment of the present invention, Figure 2-2 This is a crystal surface diagram of the twelfth embodiment of the present invention. Figure 2-3 is a crystal surface diagram of the thirteenth embodiment of the present invention, Figure 2-4 is a crystal surface diagram of the fourteenth embodiment of the present invention, Figure 2-5 This is a crystal surface diagram of the fifteenth embodiment of the present invention. Figure 2-6 is a crystal surface diagram of the sixteenth embodiment of the present invention, Figure 2-7 is a crystal surface diagram of the seventeenth embodiment of the present invention, Figure 2-8 is a crystal surface diagram of the eighteenth embodiment of the present invention, Figure 2-9 is a crystal surface diagram of the nineteenth embodiment of the present invention, and Figure 2-10This is a crystal surface diagram of the twentieth embodiment of the present invention.

[0130] In the nanocrystals of the eleventh to twentieth embodiments, the material of the nanocrystals is Al2O3, and Figure 2-1 to Figure 2-10 The size ratios are all about 0.95μm in width, 1.27μm in length, and 1.2μm in total area. 2 .

[0131] Please refer to Table 3 below.

[0132]

[0133]

[0134] Table 3 shows the values ​​of parameters such as DC, R3878, R3850, R4070, R4055, R4565, R5058, R5570, and R5878 in the optical elements of the micro-optical lens in the eleventh to twentieth embodiments of the present invention, wherein Em11 to Em20 represent the eleventh to twentieth embodiments respectively.

[0135] Please refer to Table 4 below, which shows the reflectivity values ​​of the low reflection layers of the eleventh to twentieth embodiments of the present invention at wavelengths of 380 nm-780 nm.

[0136]

[0137]

[0138]

[0139] <Twenty-first to Thirtieth Embodiments>

[0140] Please refer to Figure 3 to Figure 3-10 , Figure 3 The reflectivity values ​​of the low reflection layer in the 21st to 30th embodiments of the present invention at wavelengths of 380nm-780nm are shown. Figure 3-1 is a crystal surface diagram of the twenty-first embodiment of the present invention, Figure 3-2 This is a crystal surface diagram of the twenty-second embodiment of the present invention. Figure 3-3 is a crystal surface diagram of the twenty-third embodiment of the present invention, Figure 3-4 This is a crystal surface diagram of the twenty-fourth embodiment of the present invention. Figure 3-5 This is a crystal surface diagram of the twenty-fifth embodiment of the present invention. Figure 3-6 is a crystal surface diagram of the twenty-sixth embodiment of the present invention, Figure 3-7 is a crystal surface diagram of the twenty-seventh embodiment of the present invention, Figure 3-8 is a crystal surface diagram of the twenty-eighth embodiment of the present invention, Figure 3-9is a crystal surface diagram of the twenty-ninth embodiment of the present invention, and Figure 3-10 This is a crystal surface diagram of the thirtieth embodiment of the present invention.

[0141] In the nanocrystals of the twenty-first embodiment to the thirtieth embodiment, the material of the nanocrystals is TiO2, and Figure 3-1 to Figure 3-10 The size ratios are all about 0.95μm in width, 1.27μm in length, and 1.2μm in total area. 2 .

[0142] Please refer to Table 5 below.

[0143]

[0144]

[0145] Table 5 shows the values ​​of parameters such as DC, R3878, R3850, R4070, R4055, R4565, R5058, R5570, and R5878 in the optical elements of the micro-optical lens in the twenty-first to thirtieth embodiments of the present invention, wherein Em21 to Em30 represent the twenty-first to thirtieth embodiments respectively.

[0146] Please refer to the following Table 6, which shows the reflectivity values ​​of the low reflection layers of the 21st to 30th embodiments of the present invention at wavelengths of 380nm-780nm.

[0147]

[0148]

[0149]

[0150] Please refer to Figures 4 to 11 , Figure 4 is a graph showing the relationship between the value of the parameter R3878 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Figure 5 is a graph showing the relationship between the value of the parameter R3850 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Figure 6 is a graph showing the relationship between the value of the parameter R4070 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Figure 7 is a graph showing the relationship between the value of the parameter R4055 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Figure 8 is a graph showing the relationship between the value of the parameter R4565 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Fig. 9is a graph showing the relationship between the value of the parameter R5058 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention, Fig.10 is a graph showing the relationship between the value of the parameter R5570 of the first embodiment to the thirtieth embodiment of the present invention and the average particle size of the nanocrystals, and Fig.11 3 is a graph showing the relationship between the value of the parameter R5878 and the average particle size of the nanocrystals in the first to thirtieth embodiments of the present invention.

[0151] Figures 4 to 11 1 to 30th embodiment of the present invention, respectively, the parameters R3878, R3850, R4070, R4055, R4565, R5058, R5570, R5878 and DC, and the detailed values ​​of R3878, R3850, R4070, R4055, R4565, R5058, R5570, R5878 and DC of the first to 30th embodiment have been disclosed in the aforementioned Table 1, Table 3 and Table 5, which will not be repeated here. The reflectance of the present invention is measured at a vertical (0 degree) incident / reflecting surface to calculate the power ratio of the reflected wave to the incident wave.

[0152] <Thirty-first embodiment>

[0153] Please refer to Fig.12 , which is a cross-sectional view of a micro-optical lens 100 according to the thirty-first embodiment of the present invention. The micro-optical lens 100 comprises an optical element (not separately labeled). The optical element comprises a low-reflection layer (not separately labeled), which is located on at least one surface of the optical element, and the low-reflection layer comprises a plurality of nanocrystals, and the plurality of nanocrystals are located on a surface of the low-reflection layer.

[0154] Specifically, in the thirty-first embodiment, the micro optical lens 100 includes three shading elements 110, two annular spacer elements 120 and a lens barrel element 130, and the low reflection layer is located on at least one surface of the shading element 110, the annular spacer element 120 and the lens barrel element 130, and the nano crystals of the low reflection layer can be used as required. The nano crystals of the first embodiment to the thirtieth embodiment can be used. In this way, the nano crystals of appropriate particle size can destroy and weaken the intensity of stray light incident on the surface where the low reflection layer is located, and the selection of nano crystal materials with appropriate refractive index can make the refractive index between the surface of the optical element and the air reach a gradient distribution, which will help maintain the ultra-low reflectivity of the surface of the optical element and improve the optical imaging quality of the micro optical lens 100.

[0155] <Thirty-second embodiment>

[0156] Please refer to Fig.13A , Fig. 13B , Fig. 13C and Fig.13D , Fig.13A is a schematic diagram illustrating an electronic device 10 according to a thirty-second embodiment of the present invention. Fig. 13B It is shown Fig.13A Another schematic diagram of the electronic device 10, Fig. 13C It is shown Fig.13A Schematic diagram of components of the electronic device 10, Fig.13D It is shown Fig.13A A block diagram of an electronic device 10 is shown. Fig.13A , Fig. 13B , Fig. 13C as well as Fig.13D It can be seen that the electronic device 10 is a smart phone, and the electronic device 10 includes an imaging device 11, wherein the imaging device 11 includes a micro optical lens 12 and an electronic photosensitive element 13 of the present invention, and the electronic photosensitive element 13 is disposed on the imaging surface (not shown) of the micro optical lens 12. This helps to meet the current electronic device market's requirements for mass production and appearance of imaging lens modules mounted thereon.

[0157] Furthermore, the user enters the shooting mode through the user interface 19 of the electronic device 10, wherein the user interface 19 in the thirty-second embodiment may be a touch screen 19a, a button 19b, etc. At this time, the micro optical lens 12 collects imaging light on the electronic photosensitive element 13 and outputs electronic signals related to the image to the image signal processing element (Image Signal Processor, ISP) 18.

[0158] In response to the camera specifications of the electronic device 10, the electronic device 10 may further include an optical image stabilization component 14, which may be an OIS (Optical Image Stabilization) anti-shake feedback device. Furthermore, the electronic device 10 may further include at least one auxiliary optical element (not shown) and at least one sensor element 16. The auxiliary optical element may include a flash module 15a and a focus auxiliary module 15b. The flash module 15a may be used to compensate for color temperature, and the focus auxiliary module 15b may be an infrared ranging element, a laser focus module, etc. The sensing element 16 may have the function of sensing physical momentum and actuation energy, such as an accelerometer, a gyroscope, or a Hall Effect Element, to sense the shaking and jittering of the user's hand or the external environment, thereby facilitating the automatic focus function and the optical image stabilization component 14 configured in the image capturing device 11 of the electronic device 10 to obtain good imaging quality, and helping the electronic device 10 according to the present invention to have multiple modes of shooting functions, such as optimized Selfie, low-light HDR (High Dynamic Range), high-resolution 4K (4K Resolution) video recording, etc. In addition, the user can directly visually see the camera's shooting screen through the touch screen 19a, and manually operate the framing range on the touch screen 19a to achieve a WYSIWYG automatic focus function.

[0159] Furthermore, by Fig. 13C It can be seen that the image capturing device 11, the optical image stabilization component 14, the sensor element 16, the flash module 15a and the focus auxiliary module 15b can be arranged on a flexible printed circuit board (FPC) 17a, and electrically connected to the imaging signal processing component 18 and other related components through the connector 17b to execute the shooting process. Current electronic devices such as smart phones have a trend of being thin and light. The image capturing device and related components are arranged on a flexible printed circuit board, and the circuit is then integrated to the mainboard of the electronic device using a connector. This can meet the requirements of the mechanism design and circuit layout of the limited space inside the electronic device and obtain a greater margin, and also enable the automatic focus function of the image capturing device to be more flexibly controlled through the touch screen of the electronic device. In other embodiments (not disclosed in the figure), the sensor element and the auxiliary optical element can also be arranged on the mainboard of the electronic device or other forms of carrier according to the requirements of the mechanism design and circuit layout.

[0160] In addition, the electronic device 10 may further include but is not limited to a display unit (Display), a control unit (ControlUnit), a storage unit (StorageUnit), a random access memory (RAM), a read-only storage unit (ROM) or a combination thereof.

[0161] <Thirty-third embodiment>

[0162] Please refer to Fig.14 , which is a schematic diagram of an electronic device 20 according to a thirty-third embodiment of the present invention. Fig.14 As shown, the electronic device 20 is a smart phone, and the electronic device 20 includes three imaging devices 21, wherein the imaging device 21 includes the micro optical lens (not shown) and the electronic photosensitive element (not shown) of the present invention.

[0163] Furthermore, the user enters the shooting mode through the user interface (not shown) of the electronic device 20, at which time the micro optical lens will collect imaging light on the electronic photosensitive element and output electronic signals related to the image to the imaging signal processing element 28. In response to the camera specifications of the electronic device 20, the electronic device 20 may further include an optical image stabilization component 24, a flash module 25a, and a focus auxiliary module 25b, so as to obtain good imaging quality.

[0164] <Thirty-fourth embodiment>

[0165] Fig.15 FIG. 3 is a schematic diagram illustrating an electronic device 30 according to a thirty-fourth embodiment of the present invention. The electronic device 30 according to the thirty-fourth embodiment is a tablet computer, and the electronic device 30 includes an imaging device 31 according to the present invention.

[0166] <Thirty-fifth embodiment>

[0167] Fig.16 FIG. 4 is a schematic diagram illustrating an electronic device 40 according to a thirty-fifth embodiment of the present invention. The electronic device 40 according to the thirty-fifth embodiment is a wearable device, and the electronic device 40 includes an imaging device 41 according to the present invention.

[0168] Although the present invention has been disclosed as above in the form of an implementation method, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the attached claims.

Claims

1. A micro optical lens, characterized in that: Include: An optical element, comprising: A low reflection layer is located on at least one surface of the optical element, wherein the low reflection layer is formed by roughening and crystallization, and the low reflection layer comprises: A plurality of nanocrystals are located on a surface of the low-reflection layer, and the material of the plurality of nanocrystals is SiO2; The reflectivity of the low-reflection layer at a wavelength of 380nm-780nm is R3878, and the average particle size of the plurality of nanocrystals is DC, which satisfies the following conditions: R3878 ≤ 0.50%; and 20nm≤DC≤200nm.

2. The micro optical lens according to claim 1, characterized in that: The average particle size of the plurality of nanocrystals is DC, which satisfies the following conditions: 20nm≤DC≤150nm.

3. The micro optical lens according to claim 2, characterized in that: The average particle size of the plurality of nanocrystals is DC, which satisfies the following conditions: 39nm≤DC≤88nm.

4. The micro optical lens according to claim 1, characterized in that: The reflectivity of the low reflection layer at a wavelength of 380nm-780nm is R3878, which meets the following conditions: R3878≤0.30％。 5. The micro optical lens according to claim 4, characterized in that: The reflectivity of the low reflection layer at a wavelength of 380nm-780nm is R3878, which meets the following conditions: R3878≤0.15％。 6. The micro optical lens according to claim 5, characterized in that: The reflectivity of the low reflection layer at a wavelength of 380nm-500nm is R3850, which meets the following conditions: R3850≤0.40％。 7. The micro optical lens according to claim 6, characterized in that: The reflectivity of the low reflection layer at a wavelength of 400nm-700nm is R4070, which meets the following conditions: R4070≤0.50％。 8. The micro optical lens according to claim 7, characterized in that: The reflectivity of the low reflection layer at a wavelength of 400nm-550nm is R4055, which meets the following conditions: R4055≤0.40％。 9. The micro optical lens according to claim 8, characterized in that: The reflectivity of the low reflection layer at a wavelength of 450nm-650nm is R4565, which meets the following conditions: R4565≤0.40％。 10. The micro optical lens according to claim 9, characterized in that: The reflectivity of the low reflection layer at a wavelength of 500nm-580nm is R5058, which meets the following conditions: R5058≤0.50％。 11. The micro optical lens according to claim 10, characterized in that: The reflectivity of the low reflection layer at a wavelength of 550nm-700nm is R5570, which meets the following conditions: R5570≤0.30％。 12. The micro optical lens according to claim 11, characterized in that: The reflectivity of the low reflection layer at a wavelength of 580nm-780nm is R5878, which meets the following conditions: R5878≤0.80％。 13. An imaging device, characterized in that: Include: The micro optical lens as claimed in claim 1; and An electronic photosensitive element is arranged on an imaging surface of the micro optical lens.

14. An electronic device, characterized in that: Include: The imaging device as claimed in claim 13.

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