KR20080042476A - A heat-resistant multi-coting lens - Google Patents

Abstract

A heat-resistant multilayer lens is provided to improve safety of the lens at a high temperature by protecting a multi-coating layer of the multilayer lens. A heat-resistant multilayer lens includes at least five layers which are laminated at both sides of the lens. The heat-resistant multilayer lens is manufactured in a high vacuum chamber. A first layer(1) is a silicon dioxide layer and has a thickness between 1350 and 1550 Å. A second layer(2) is a titanium dioxide layer and has a thickness between 80 and 110 Å. A third layer(3) is a silicon dioxide layer and has a thickness between 130 and 150 Å. A fourth layer(4) is a titanium dioxide layer and has a thickness between 80 and 150 Å. A fifth layer(5) is a silicon dioxide layer and has a thickness between 800 and 900 Å.

Description

Multi-layer thin-film spectacle lens having a heat-resistant function {a heat-resistant multi-coting lens}

1 shows a coating sequence of a general lens.

2 shows the coating sequence of the heat-resistant lens disclosed in the present invention.

The present invention relates to a multi-coated lens, in particular, in the multi-coating of various lenses including eyeglass lenses, by inserting a titanium dioxide layer in two intermediate coating layers of the five anti-reflection (AR) coating layer about 100 degrees It is designed to prevent lens distortion and deformation of the multi-coating layer even at the temperature of.

Commonly used spectacle lenses are first processed in a cast spherical or flat state, and then hard-treatement to form a hard film having a thickness of several to several tens of um on the lens surface, which is important for the characteristics of the lens. In order to obtain high transmittance, AR coating is secondaryly processed in high vacuum of 5x10-5 Torr or less. Multi-coating to such lenses is already a common technique, and it leads to designing the reflection color on the lens in any color within the visible ray (400 to 700 nm) (previously mainly green: about 550 nm). It became. Disclosure of Invention The present invention proposes a groundbreaking method for improving the fatal problem that has been raised in the lens after AR coating.

In general, two kinds of deposition methods for spectacle lenses can be classified into (CVD (Chemical Vapor Deposition) and PVD (Physical Vapor Deposition) deposition method) under high vacuum (1x10-5 Torr or less). It is a method of manufacturing a solid thin film on a target-target by reacting at a target, and because it can be applied to various chemical reactions, various kinds of thin films can be obtained, and a large amount of source is deposited by a small amount of source. The CVD method is difficult to control the deposition rate and the thickness of the thin film due to its advantages, and the thin film is deformed due to the stress generated during the thin film formation and the difference between the thin film and the coefficient of thermal expansion. This disadvantage is a multilayer deposition system for optical lenses that requires precise deposition rate and thin film thickness control. On the other hand, PVD methods, such as E-Beam Evaporation, have fixed source and target positions and can control the continuous electron beam energy to compensate for the shortcomings of the CVD method. The thickness of the thin film can be controlled in detail by the thickness monitor using a crystal sensor. In the conventional technology manufactured as described above, a hard film (Fig. 1-2) is formed on a casting lens (Fig. 1-1), followed by optical simulation of silicon dioxide and zirconium dioxide in five steps. The obtained thickness is deposited as shown in Figs. 1-3 to 1-7. Fig. 1-8 is a water-prooff conventionally applied to a multi-coated lens. The multi-coated lens formed as described above is a general method applied to most spectacle lenses currently in circulation, and the lens thus formed has a fatal disadvantage that is weak to heat. In order to prevent the deformation of the polymer structure of the lens from the process step, the deposition is performed at low temperature (60 ~ 80 degrees) and has a layer structure that is agitated with each other. In this case, the expansion rate of silicon dioxide and zirconium dioxide is different, resulting in cracking and fracture of the multi-coating layer, which significantly reduces the permeability of the lens itself, thereby making the lens multi-layer unrecoverable. Will be made. In many cases reported so far, the temperature inside a car parked on a hot summer day is dozens of degrees higher than room temperature. If you put glasses or sunglasses on it, thermal breakdown is caused by the temperature difference. In addition, heat destruction of the multi-coating layer is known to occur due to the high temperature in places such as saunas, and many cases have been reported in the environment of working at a high temperature and in a special temperature environment.

Accordingly, the present invention is to solve the above-mentioned disadvantages, in the high temperature environment often encountered in daily life, the multi-coat layer for improving the basic transmittance of the lens and the already used UV blocking layer, electromagnetic wave blocking layer, water film layer The back has proposed a method to prevent thermal destruction. In detail, the conventional deposition material is made of silicon dioxide and zirconium dioxide, as shown in FIG. 1, but the present invention does not completely use zirconium dioxide as shown in FIG. Designed.

In the multi-coating lens proposed in the present invention, the coating layer coated on the surface of the lens (FIG. 2-1) is laminated in a proper order using silicon dioxide and zirconium dioxide, as shown in FIG. 2. Such a multi-coated lens is continuously laminated in a high vacuum evaporation as in the conventional production process, including the hard coating (Fig. 2-1) and the water film coating (Fig. 2-8) under vacuum. do. The thickness design of the material used of the lens is as follows.

First floor. Silicon dioxide (SiO2) -1350-1550 A

Second layer. Titanum dioxide (TiO2) -80-110 A

3rd floor. Silicon dioxide (SiO2) -130-150 A

4th floor. Titanum dioxide (TiO2) -80 ~ 150A A

5th floor. Silicon dioxide (SiO2) -800 ~ 900 A

The above process is the laminated structure most basically used in the experimental process of the present invention. The general lamination structure can be thought of as Stranski-Krastanow (SK) style, which is usually grown by Layer-by-Layer, but there is no Lattice mismatch in the SK style, and Valmer-Werver (VW) style is island growth form from the beginning of growth. Will be taken. Most laminates of different materials are subject to bond stresses at the joints when the lattice mismatch exceeds a few percent. This unstable bond causes bond breakage due to temperature and other conditions around it. Similarly, in the actual embodiment, the desired heat resistance function could not be obtained only under such conditions. The reason for this is that the initial growth pattern of the material with different lattice size is the VW form, and the molecular layer arrangement of silicon dioxide and titanium dioxide is simulated for proper cause identification. One important process of the present invention proposes a method of stabilizing a laminate structure of silicon dioxide and titanium dioxide grown in a V-W form by annealing. Two important processes of heat treatment are the pre-annealing process and the post-annealing process. Detailed method is as follows.

1. Pre-heat treatment process.

a. For multi-coating of lenses, set the working temperature in the chamber to 60 ~ 80 degrees before setting the lens into the high vacuum chamber.

b. 30 ~ 40min electrothermal treatment at 60 ~ 80 ℃.

This electrothermal treatment leads to the removal of water from the lens surface and the relaxation of the surface polimer structure.

2. After heat treatment process

a. After the process is completed in the chamber of high vacuum day pressure and high temperature, the lens is vented to atmospheric pressure through the vent process.

b. After stabilization of the laminate structure due to the rapid change in temperature and pressure, post-heat treatment is performed for 1-2 hours at a temperature of 90-110 degrees.

c. After the heat-treated lens is cooled slowly at intervals of 10-20 degrees / 5 minutes to prevent sudden heat changes to room temperature.

As a result of testing the finished lens through this process, it has superior heat resistance compared to the lens produced by the conventional technology, so that the thermal destruction phenomenon of the multi-layer and the distortion of the lens are eliminated even at a temperature between 60 and 100 degrees. Found.

In the present invention, an anti-reflection coating of a heat-resistant functional 5-layer multi-coating is proposed. The components of the present invention are as follows.

1. 30 ~ 40min electrothermal treatment at 60 ~ 80 ℃.

2. Design of an antireflective 5-layer thin film using silicon dioxide and titanium dioxide.

3. Post-heat treatment is performed for 1-2 hours at a temperature of 90-110 degrees.

4. Cool to 10 ~ 20 ° / 5 minutes intervals to prevent heat change to room temperature.

The present invention is designed to have heat resistance by complementing the thermal breakdown phenomenon according to the temperature of the existing multi-coated spectacle lens. The lens proposed by the present invention can protect a multi-coating layer such as glasses lenses and sunglasses lenses that exhibited a thermal breakdown at a temperature in a parked car in summer day. In addition, it can be used in baths, saunas and other high-temperature workplaces, enabling high transmittance and safe lenses.

Claims (2)

Non-reflective coating lens made of the following order and amount of materials in a heat-resistant spectacle lens in which a multi-coating layer based on five layers is laminated on both sides of a lens produced under a high vacuum chamber. First floor. Silicon dioxide (SiO2) -1350-1550 A Second layer. Titanum dioxide (TiO2) -80-110 A 3rd floor. Silicon dioxide (SiO2) -130-150 A 4th floor. Titanum dioxide (TiO2) -80-150 A 5th floor. Silicon dioxide (SiO2) -800 ~ 900 A Lens produced to enhance the heat resistance function through the following pre-treatment and post-treatment process in the production process of the lens as described in claim 1.  In the electrothermal treatment process, the glasses lens is subjected to a post-heat treatment of the lens out of the high vacuum chamber at a temperature of 60 to 80 degrees for 1 to 2 hours at a temperature of 90 to 110 degrees.

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