KR102444567B1 - A Coating Lens Having an Enhancing Coating Lens and a Depositing Method for the Same - Google Patents

Abstract

The present invention relates to a coated lens having an improved coating layer. The coated lens includes a first layer 11 of aluminum oxide (Al ₂ O ₃ ) material; a second layer 12 formed on one side of the first layer 11 while having a larger thickness than the first layer 11; and a second layer 13 formed on the other surface of the first layer 11 while having a smaller thickness than the second layer 11, wherein the second layer 12 or the third layer 13 is Ti and at least two layers formed of a material selected from the group consisting of ₃ O ₅ , SiO _{2 ,} MgF ₂ and SiO ₂ /Al ₂ O ₃ .

Description

A Coating Lens Having an Enhancing Coating Lens and a Depositing Method for the Same

This application is in accordance with the Masan Free Trade Area Competitiveness Reinforcement Project (Kyungnam Techno Park, the leading institution), which is a free trade area competitiveness enhancement project managed by the Korea Industrial Technology Promotion Agency under the Ministry of Trade, Industry and Energy. Thank you.

The present invention relates to a coated lens having an improved coating layer and a deposition method therefor, and specifically, to a coated lens having an improved coating layer formed with a coating layer to improve impact resistance and weather resistance of the lens, and a deposition method therefor it's about

A lens corresponding to an optical means for collecting or dispersing light by refraction may be made of a transparent material such as glass, or made of glass or a synthetic resin material. Various types of coating layers may be formed on a lens made of such a material to be suitable for the purpose of use of the lens. For example, an anti-reflection coating layer may be formed on a lens for spectacles to prevent glare and secure a clear view. In addition, in the case of a camera lens, a lens of a car lamp, or a lens of a rearview mirror, it is necessary to be properly coated according to each use environment or purpose. In relation to such a coated lens, Patent Publication No. 10-2019-0010221 discloses a hybrid infrared optical lens having a ta_c and Y ₂ O ₃ coating thin film layer. In addition, Patent Publication No. 10-2019-0053865 discloses an optical lens including an anti-reflection coating that greatly reduces the reflection of visible light over a wide range of incident angles on any one of the main surfaces. The lens coating layer needs to have sufficient strength for a protective function while having high transmittance. In addition, depending on the purpose of use, it is necessary to have sufficient resistance to thermal shock and to have chemical resistance. However, the prior art does not disclose a lens formed with a coating layer having such properties.

The present invention is to solve the problems of the prior art and has the following objects.

Prior Art 1: Patent Publication No. 10-2019-0010221 (Korea Institute of Optical Technology, published on January 30, 2019) Hybrid infrared optical lens with ta-C and Y2O3 coating thin film layers Prior Art 2: Patent Publication No. 10-2019-0053865 (Esilo Anternacional, published on May 20, 2019) Optical lens comprising an anti-reflection coating having multi-angle efficiency

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coated lens having an improved coating layer that has high strength, is strong against thermal shock, has high chemical resistance and scratch resistance, and at the same time does not cause stains.

According to a suitable embodiment of the present invention, the coated lens comprises a first layer of aluminum oxide (Al ₂ O ₃ ) material; a second layer formed on one side of the first layer while having a larger thickness than the first layer; and a third layer formed on the other side of the first layer while having a smaller thickness than the second layer, wherein the second layer or the third layer is Ti ₃ O ₅ , SiO _{2 ,} MgF ₂ and SiO ₂ /Al ₂ and at least two layers formed of a material selected from the group consisting of O ₃ .

According to another suitable embodiment of the present invention, the second or third layer comprises at least two identical layer structures.

According to another suitable embodiment of the present invention, the second layer and the third layer comprise the same layer structure.

According to another suitable embodiment of the present invention, the average reflectance (Ravg) and the absolute reflectance (Rabs) are 1.5% or less and 2.5% or less, respectively.

According to another suitable embodiment of the present invention, 8 to 12 sub-coating layers are formed, and the thickness of the entire coating layer is 4 to 5 μm.

According to another suitable embodiment of the present invention, the wavelength band below 350 nm is blocked.

The coated lens with the improved coating layer according to the present invention makes it possible to prevent the occurrence of scratches or stains on the coating layer. In addition, the coated lens according to the present invention has high chemical resistance and durability while being strong in thermal shock. Due to these characteristics, the coated lens according to the present invention may be applied as a vehicle lens, for example, may be used as a sensor camera lens for autonomous driving of a vehicle, but is not limited thereto.

1 shows an embodiment of a coating layer formed on a coated lens having an improved coating layer according to the present invention.
Figure 2 shows another embodiment of the coating layer formed on the coating lens according to the present invention.
3a to 3e show test results for a coated lens according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments are for a clear understanding of the present invention, and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so unless necessary for the understanding of the invention, the description will not be repeated and well-known components will be briefly described or omitted, but the present invention It should not be construed as being excluded from the embodiment of

1 shows an embodiment of a coating layer formed on a coated lens having an improved coating layer according to the present invention.

Referring to FIG. 1 , a coated lens having an improved coating layer includes a first layer 11 of aluminum oxide (Al ₂ O ₃ ) material; a second layer 12 formed on one side of the first layer 11 while having a larger thickness than the first layer 11; and a third layer 13 formed on the other surface of the first layer 11 while having a smaller thickness than the second layer 11 , wherein the second layer 12 or the third layer 13 is Ti and at least two layers formed of a material selected from the group consisting of ₃ O ₅ , SiO _{2 ,} MgF ₂ and SiO ₂ /Al ₂ O ₃ .

The coating layer may be formed on one surface of the lens substrate S, and may be formed on an incident surface through which light is introduced. The coating layer may consist of a plurality of layers, for example, 8 to 12 sub-coating layers. Each sub-coating layer may have a different thickness, for example, each sub-coating layer may have a thickness of 20 to 1,500 nm. The material for forming the sub-coating layer may be, for example, one material selected from the group consisting of Al ₂ O ₃ , Ti ₃ O ₅ , SiO _{2 ,} MgF ₂ and SiO ₂ /Al ₂ O ₃ (mixture), and , each sub-coating layer may be formed, for example, by vacuum deposition (sputtering), but is not limited thereto, and each sub-coating layer may be formed by various methods. When the coating layer is formed of Al ₂ O ₃ , it has an advantage that the strength of the coating layer increases, but has a disadvantage that light transmittance may be lowered. Therefore, it is advantageous for the aluminum oxide coating layer to have a thin thickness while being formed as an inner layer. In addition, at least two sub-coating layers may be formed on one side and the other side of the aluminum oxide coating layer to increase the overall strength while improving the impact resistance. Although the MgF ₂ coating layer has high transmittance, it may cause peeling in a high temperature and high humidity environment. Therefore, it is advantageous to form the inner sub-coating layer to prevent penetration of moisture, or not to form the MgF ₂ coating layer when the lens is to be used in outdoor environmental conditions or in a humid environment. The Ti ₃ O ₅ or SiO ₂ sub-coating layer has the advantage of high strength and high transmittance. In addition, since the adhesion to the lens is high and the surface friction coefficient is low, it is advantageous to form the inner sub-coating layer in contact with the lens or the outer sub-coating layer in contact with the external environment. SiO ₂ /Al ₂ O ₃ (mixture) may be mixed in a ratio of SiO ₂ :Al ₂ O ₃ =100:10 to 100 by weight. However, SiO ₂ /Al ₂ O ₃ (The sub-coating layer has the advantage of increasing transmittance and strength at the same time, but has the disadvantage that surface stains or scratches may occur. Advantageously, the laminate structure of a plurality of sub-coating layers can be determined according to the characteristics of each coating agent. For example, as shown in Fig. 1, the coating layer is formed of a plurality of materials as described above. It may consist of a sub-coating layer The coating layer may include at least one sub-coating layer made of an Al ₂ O ₃ material. Specifically, a first layer made of an aluminum oxide (Al ₂ O ₃ ) material to form a coating layer. 11 may be formed, and the first layer 11 may consist of one sub-coating layer, and the second layer 12 composed of at least one sub-coating layer on a lower portion of the first layer 11 . ) may be formed, and a third layer 13 including at least one sub-coating layer may be formed on an upper portion of the first layer 11. The second layer 12 or the third layer 13 ) may include the same layer structure, for example, may include a sub-coating layer of the same material, or may include a continuous sub-coating layer of Ti ₃ O ₅ and SiO _2, a material. 12) and the third layer 13 are formed to include the same sub-coating layer structure, so that the lens focus is prevented from changing and the image is prevented from being deformed due to the occurrence of various aberrations. As shown, the second layer 12 may consist of first, second, and third structural layers 12a, 12b, 12c, while each structural layer 12a, 12b, 12c may consist of the same sub-coating layer. For example, the second and third structure layers 12a , 12b , and 12c may be formed of sub-coating layers of Ti ₃ O ₅ and SiO _2. When the second layer 13 has such a structure, the third layer (13) silver The arrangement of the sub-coating layers may be the same based on the first layer 11 while including the same sub-coating layer. The second or third layer 12 or 13 may be made of various structures capable of preventing a change in focus or an image deformation relative to the first layer 11 and is not limited to the presented embodiment. In the presented embodiment, the lens substrate (S); second layer 12; first layer 11; And although it is suggested that the coating layers are formed in the order of the third layer 13, the third layer 13 is formed on the lens substrate S, and then the first layer 11 and the second layer 12 are can be formed.

Figure 2 shows another embodiment of the coating layer formed on the coating lens according to the present invention.

Referring to FIG. 2 , the coating layer may include the same layer structure formed above and below the reference layer 21 with respect to the reference layer 21 . For example, the reference layer 21 may be one sub-coating layer made of aluminum oxide (Al ₂ O ₃ ) material. Ti ₃ O ₅ on the underside of the reference layer 21, respectively and first and second characteristic structure layers 24a and 24b composed of a sub-coating layer of SiO ₂ may be formed. And a bonding sub-layer 22 is formed on the upper surface of the reference layer 21 , and a third sub-coating layer formed of the same sub-coating layers as the first and second characteristic structural layers 24a and 24b above the bonding sub-layer 22 . , 4 characteristic structural layers 24c, 24c may be formed. And the 4 structure layers (24c, 24c) may include a sub-coating layer to prevent stains, foreign matter adsorption or scratches, for example, Ti ₃ O ₅ or SiO ₂ It may include a sub-coating layer of material. The sub-coating layers forming the coating layers 21 , 22 , 23 , and 24a to 24d may have various thicknesses. In addition, the thickness of the entire coating layer (21, 22, 23, 24a to 24d) may be 2 to 10 μm, preferably 3 to 6 μm, most preferably 4 to 5 μm, but is not limited thereto.

Physical properties or optical properties of a coated lens having such a coating layer will be described below.

3a to 3e show test results for a coated lens according to the present invention.

In the characteristic test of Figure 3a, the structure of the coating layer is as follows, the thickness unit is nm, S, T and A are SiO ₂ , Ti ₃ O ₅ and Al ₂ O ₃ , respectively, and in the examples of 3b to 3e same. Also, the arrangement of the sub-coating layer is based on the lens substrate, but as described above, the present invention is not limited thereto.

(i) Lens base material: HOYA LaF ₃ Glass material or alternative CDGM H-LaF2 material lens

(ii) sub coating layer: STSTSTSTATS (11 layers)

(iii) thickness (nm): A: 70-90; STSTSTST: 3,300 to 3,500; TS: 1,100 to 1,400

(iv) Thermal shock test: 110 ℃ / 2 hours left standing

(v) Acid resistance test: Sulfuric acid undiluted solution/2 hours left

(vi) Transmittance was tested by HITACHI's SPECTROPHOTONMETER U4100 equipment, and the coating surface was scratched with a cutter.

Referring to (A) of Figure 3a, as shown in the thermal shock and acid resistance test results on the left, it can be seen that the coated lens according to the present invention has high acid resistance while being strong in thermal shock. In addition, it was confirmed that scratches did not occur when scratching with a cutter, and no stains were left. Also, referring to (b) of FIG. 3a, the X-axis represents a wavelength (wavelength: nm), and the Y-axis represents a reflectance (Reflectance: %), respectively, AOI (Automatic Optical Inspection) = 0 degrees (400 to 700 nm: blue) and Ravg < 0.8%, Rabs <1.0% at 45 degrees (400-700 nm); and Ravg ≤ 1.5%, and Rabs ≤ 2.5%.

The characteristic test conditions of FIGS. 3B to 3E are as follows, and the test was performed in the same manner as in FIG. 3A .

Figure 3b:

(i) Lens base material: HOYA's FC5 glass material or CDGM's H-QK3L lens material that can be replaced therewith

(ii) Sub coating layer: SA1TA2TA3TS (8 layers)

(iii) thickness (nm): A3:90-120; A2: 250 to 280; A1 450 to 500; TS: 850 to 1,200; T: 80 to 100; S: 1,500 to 2,000

Figure 3c:

(i) Lens material: HOYA's TAFD25 glass material or CDGM's H-ZLaF75A lens material that can be replaced therewith

(ii) sub coating layer: STSTSTSTATS (11 layers)

(iii) thickness (nm): A: 70-90; STSTSTST: 3,300 to 3,500; TS: 1,100 to 1,400

Figure 3d:

(i) Lens material: HOYA's TAC8 glass material or CDGM's H-LaK52 material lens that can be replaced therewith

(ii) sub coating layer: STSTSTSTATS (11 layers)

(iii) thickness (nm): A: 70-90; STSTSTST: 3,300 to 3,500; TS: 1,100 to 1,400

Figure 3e:

(i) Lens material: HOYA's FDS18W glass material or CDGM's H-ZF88 material lens that can be replaced therewith

(ii) sub coating layer: STSTSTSTATS (11 layers)

(iii) thickness (nm): A: 70-90; STSTSTST: 3,300 to 3,500; TS: 1,100 to 1,400

Referring to FIGS. 3B to 3E , as shown in the thermal shock and acid resistance test results on the left, it can be seen that the coated lens according to the present invention has high acid resistance while being strong in thermal shock. In addition, it was confirmed that scratches did not occur when scratching with a cutter, and no stains were left. In addition, in the graph on the right, the X-axis represents the wavelength (wavelength: nm), and the Y-axis represents the reflectance (Reflectance: %), respectively, AOI (Automatic Optical Inspection) = 0 degrees (400 to 700 nm: blue) and 45 degrees (400 to 700 nm), Ravg ≤ 0.8%, Rabs ≤ 1.0%; and Ravg ≤ 1.5%, and Rabs ≤ 2.5%.

In each test, the thickness of SiO ₂ and Ti ₃ O ₅ forming the sub-coating layer was controlled, and the thickness of the SiO ₂ and the sub-coating layer Ti ₃ O ₅ sub-coating layer can be appropriately adjusted according to the use environment. . The thickness of each sub-coating layer was adjusted so that the thickness ratio was SiO ₂ : Ti ₃ O ₅ =1,000: 50 to 1,200. As can be seen from the test results, it can be seen that the coated lens according to the present invention is highly resistant to thermal shock, acid resistance, scratching or staining, and thus can be used in harsh outdoor environmental conditions. For example, the coated lens according to the present invention may be used as a lens for a vehicle, and preferably may be used as a camera for a sensor for autonomous driving of a vehicle, but is not limited thereto.

Although the present invention has been described in detail with reference to the presented embodiments, those skilled in the art can make various modifications and modified inventions without departing from the technical spirit of the present invention with reference to the presented embodiments. . The present invention is not limited by such variations and modifications, but only by the claims appended hereto.

11: first floor 12: second floor
13: third layer 21: reference layer

Claims (6)

A first layer 11 of aluminum oxide (Al ₂ O ₃ ) material;
a second layer 12 formed on one side of the first layer 11 while having a larger thickness than the first layer 11; and
and a third layer 13 formed on the other side of the first layer 11 while having a smaller thickness than the second layer 12,
The second layer 12 or the third layer 13 comprises at least two layers formed of a material selected from the group consisting of Ti ₃ O ₅ and SiO ₂ ,
The second layer 12 and the third layer 13 each include a continuous sub-coating layer consisting of a Ti ₃ O ₅ sub-coating layer and a SiO ₂ sub-coating layer, and the first layer 11 and the second layer 12 , respectively. and the entire coating layer including the third layer 13 forms a sub-coating layer of 11 layers, the thickness of the entire coating layer becomes 4 to 5 μm, and the average reflectance (Ravg) and the absolute reflectance (Rabs) are each 1.5% or less and 2.5% or less. delete delete delete delete The coated lens with an improved coating layer according to claim 1, wherein a wavelength band of 350 nm or less is blocked.

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