KR102334225B1 - Manufacturing method of ionized soft contact lens using microwave - Google Patents

Abstract

The present invention relates to a method for manufacturing ionic soft contact lenses and, more specifically, to a method for manufacturing ionic soft contact lenses using microwaves. The method for manufacturing ionic soft contact lenses using microwaves comprises: a step for preparing a polypropylene (PP) container (10) in which a thin film (20) is formed on the surface by depositing sodium silicate; a step for filling the PP container (10) with a preservative solution (40), and then impregnating soft contact lenses (50) with the preservative solution (40); and a step for irradiating microwaves (30) to the soft contact lenses (50) impregnated in the preservative solution (40).

Description

Manufacturing method of ionized soft contact lens using microwave

The present invention relates to a method for manufacturing a soft contact lens, and more particularly, to a method for manufacturing a soft contact lens ionized using microwaves, which can improve sharpness and fit by providing a soft contact lens ionized using microwaves.

Soft contact lenses are worn to correct vision and recognize objects, and the material of conventional contact lenses has been improved to increase the oxygen permeability so that the moisture content of the soft contact lenses is about 30 to 80%, and the diameter is 13 to 14.5 mm. Compared to hard contact lenses, the diameter is larger and the lens itself has a soft property, so it has less foreign body feeling and is excellent in wearing comfort.

Ionization is a reaction in which electrons lose or gain electrons from a neutral molecule or atom to gain an electric charge, and it becomes an ion by removing or adding electrons or other ion particles to an atom or molecule through a physical process. At this time, the atom becomes positively charged and becomes a cation or a negatively charged anion.

Here, ionization energy is required to completely separate one electron from an atom or molecule into positive ions and free electrons. And when free electrons collide with atoms, they release extra energy and become negative ions. In general, there are two types of ionization: continuous ionization and discontinuous ionization.

Microwave has no clear definition, but generally refers to radio waves with a frequency of 300 to 30,000 megacycles and a wavelength of 1 m or less. 1m to 10cm is called a decimeter wave, and 1cm to 1mm is called a millimeter wave. Microwave acts like an electrode whose electric field direction (anode and cathode) alternately changes from 1 billion to 30 billion times per second, and has a strong directivity because of its properties similar to light, and transmits radio waves only in a certain direction.

A water molecule (H ₂ O) consists of hydrogen and oxygen atoms, and the side with the hydrogen atom has an anode, and the side with the oxygen atom has a cathode. And the positive electrode likes the negative electrode, and the negative electrode likes the positive electrode. Therefore, when water molecules encounter microwaves whose poles are constantly changing, they rotate due to their tendency to follow opposite poles. It's like a compass needle turning around when you put a magnet on it. When microwaves are exposed to water, water molecules rotate and collide with each other to generate frictional heat, which results in a change in the material phase.

Korean Patent Application Publication No. 10-1998-0014700

It is an object of the present invention to propose a method for manufacturing a soft contact lens that improves the identification of the shape or color of an object and further improves the wearing comfort compared to the existing soft contact lens.

The present invention achieves the above object by proposing a soft contactrene in which a material ionized using microwaves forms a transparent film of a fine thickness on the surface.

According to the present invention, a transparent film of a fine thickness is formed on the surface of the soft contact lens by the combination of the silicon dioxide solution applied on the surface of the PP container and the microwave, thereby improving the sharpness of the soft contact lens and improving the wearing comfort.

1 is an exemplary view of a state in which a preservation solution and a soft contact lens are contained in a PP container according to the present invention;
Figure 2 is an exemplary view showing a state of irradiating microwaves in a state containing a preservative solution and a soft contact lens in a PP container according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying FIGS.

1 is an exemplary view of a state in which a preservation solution and a soft contact lens are contained in a PP container according to the present invention, and FIG. am.

The present invention is a PP (polypropylene) container (10) in a state in which the preservative solution (40) and the soft contact lens (50) are contained, and the ionized material is microscopically on the surface of the soft contact lens (50) through the process of applying the microwave (30). to form a transparent film.

The soft contact lens 50 may be formed of Etafilcon A, hilafilcon B, or nelfilcon A material. Etafilcon A, hilafilcon B, and nelfilcon A have a moisture content of about 30 to 80%, are formed to increase oxygen permeability, and have a diameter of 13 to 14.5 mm, which is larger than that of hard contact lenses. It has a soft property, so there is little feeling of foreign matter, and it is suitable as a material for forming a fine film on the surface using the microwave 30 according to the present invention because of the characteristics of the material, ionization is easy. The soft contact lens 50 formed of such a material may be pre-processed to have a desired dioptric power if necessary when vision correction is required.

The PP container 10 is formed with a thin film 20 on the surface. The thin film 20 is formed of sodium silicate as an aqueous solution. Sodium silicate dissolves well in water, and the aqueous solution is hydrolyzed to become alkaline.

The thin film 20 formed on the surface of the PP container 10 is a thin film 10 on the surface of the PP container 10 formed by coating using a microwave 30, and a thin film _{with a refractive index n f} on a substrate having a refractive _{index n sub} . During deposition, the admittance locus of the thin film according to the change in the thickness of the thin film can be expressed by changing it on the complex plane, and the normalized electric field B and magnetic field C of the thin film at normal incidence are,

이며 d는 박막의 두께이다. 어드미턴스 Y를 실수부와 허수부로 나누어,here

and d is the thickness of the thin film. Divide admittance Y into real and imaginary parts,

인 경우

이 되고, 이때 박막의 굴절률이

를 만족하면 반사율 R=0이 된다. 실제 무반사 방지 코팅(AR 코팅)에는 고 굴절률과 저 굴절률 박막으로 이루어진 다층 박막이 주로 사용되는데, 다층 박막의 경우에도 상기 수학식 1에 주어진 특성행렬이 각각의 박막 특성행렬의 곱으로 대치되는 차이만 있을 뿐 상기 수학식 2와 수학식 3의 관계는 동일하게 적용된다. 상기 수학식 3에서 보는 바와 같이 반사율은 공기의 어드미턴스 Yo=(1,0)에서 멀어질수록 증가하고 그 반대인 경우 감소한다. 따라서 박막의 굴절률과 두께를 조절함으로써 반사율을 변화시킬 수 있게 되며, 이를 이용하여 반사방지 코팅과 고 반사 코팅 및 장, 단파장 필터 등을 설계할 수 있다. 박막은 복소수 굴절률(N=n-ik)을 가지므로 어드미턴스 궤적이 유전체와는 다르며, 흡수에 따른 소멸계수 k가 n보다 훨씬 크므로 박막의 어드미턴스는 음의 허수축 부근에 존재하며 R=1이다. n_sub인 기판위에 박막을 증착할 경우 어드미턴스 Y는 (n_sub,0)에서 출발하여 박막의 두께가 증가함에 따라 점차 박막의 어드미턴스인(n,-k)에 접근한다. 두께가 증가함에 따라 공기의 어드미턴스인 (1,0)에서 멀어지므로 반사율이 증가하고, 두께가 빛의 표면침투 거리 이상이 될 경우 벌크 박막의 어드미턴스인 (n,-k)에서 거의 변하지 않게 된다. 따라서, 표면침투 거리보다 두꺼운 박막은 광학적으로 유리로 취급되며 반사율을 조절하기 위한 렌즈 코팅재로서의 역할을 하지 못하게 된다. 얇은 박막의 어드미턴스 (n_t,-k_t)는 (n_sub,0)과 (n,-k) 사이에 위치하게 되는데, 박막 위에 다시 박막을 증착할 경우 어드미턴스의 출발점은 (n_t,-k_t)이 된다. 박막이 얇다면 반사율은 박막만의 반사율과 큰 차이가 없으나 점차 두꺼워져 어드미턴스가 공기의 어드미턴스에 접근해 가면 반사율은 감소하게 된다. becomes this Here, Yo=1 represents the admittance of the incident medium, that is, air. According to the thickness of the thin film, the admittance Y also changes gradually, and the 1/4-wavelength thickness, i.e.

if

, and the refractive index of the thin film is

is satisfied, the reflectance R=0. In actual anti-reflection coating (AR coating), a multi-layer thin film composed of a high refractive index and a low refractive index thin film is mainly used. However, the relationship between Equation 2 and Equation 3 is equally applied. As shown in Equation 3, the reflectance increases as the distance from the admittance Yo=(1,0) of air increases, and vice versa, decreases. Therefore, it is possible to change the reflectance by adjusting the refractive index and thickness of the thin film, and by using this, it is possible to design anti-reflection coatings, high-reflection coatings, and long and short wavelength filters. Since the thin film has a complex refractive index (N=n-ik), the admittance locus is different from that of the dielectric, and the extinction coefficient k according to absorption is much larger than n, so the admittance of the thin film exists near the negative imaginary axis and R=1. . When depositing a thin film on a substrate of _{n sub , the admittance Y starts from (n sub} ,0) and gradually approaches the admittance of the thin film (n, -k) as the thickness of the thin film increases. As the thickness increases, the reflectance increases as it moves away from the admittance of air (1,0). Therefore, a thin film thicker than the surface penetration distance is optically treated as glass and does not function as a lens coating material for controlling reflectance. The admittance (n _t ,-k _t ) of the _{thin film is located between (n sub} ,0) and (n,-k). When the thin film is deposited again, the admittance starting point is (n _t ,-k ) _t ) becomes If the thin film is thin, the reflectance is not much different from the reflectance of the thin film alone, but as it becomes thicker and the admittance approaches the admittance of air, the reflectance decreases.

As described above, the formation of the thin film 20 on the surface of the PP container 10 may be performed using the microwave 30 . After the sodium silicate solution constituting the thin film 20 is applied to the surface of the PP container 10 , the thin film 20 is formed on the surface of the PP container 10 as silicon dioxide is deposited by exposure to a microwave 30 . That is, when the sodium silicate solution is applied to the surface of the PP container 10 and then irradiated with microwaves 30 , oxygen atoms having a negative electrode are exposed to the microwave 30 like sodium atoms having a positive electrode to follow different poles. It rotates because of its nature. As the molecules rotate, they collide with each other to cause friction, and as a result, silicon dioxide is deposited on the surface of the PP container 10 to form the thin film 20 .

On the other hand, the microwave 30, which is formed by depositing the thin film 20 on the surface of the PP container 10, operates for 1-5 seconds and stops for 1-5 seconds by repeatedly using the on-off control method. A multi-layered thin film 20 may be formed.

Preservative solution 40 is a mixture of sodium chloride, boric acid, borax, sodium edetate, and sorbic acid is adopted. The acidity is PH 6.5-8.0, and each component is mixed using sterile distilled water, and sodium chloride (Nacl) is included as an osmotic pressure regulator.

The preservative solution 40 and the soft contact lens 50 as described above are placed in the PP container 10 on which the thin film 20 is formed and ionized when irradiated with a microwave 30 . The material constituting the thin film 20 formed on the surface of the PP container 10 and the preservative solution 40 are ionized in response to the microwave 30 . That is, when the preservative solution 40 of the soft contact lens 50 is exposed to the microwave 30, the atoms of the preservative solution 40 become negatively charged anions, and the soft contact lens 50 is ionized by being positively charged and becoming cations. will be. In this process, a thin transparent film of NMV (N-Methyl-N-vinylacetamide) and NVP (1-Vimyl-2-pyrrolidinone) is formed on the surface of the soft contact lens 50). Not only does it help to make it fit, but it also improves the wearing comfort by forming a uniform surface.

10: PP container, 20: thin film,
30: microwave, 40: preservative,
50: soft contact lenses.

Claims (3)

A PP container 10 in which sodium silicate is deposited on the surface to form a thin film 20 is provided, the PP container 10 is filled with a preservative solution 40, and a soft contact lens 50 is placed in the preservative solution 40. A method of manufacturing a soft contact lens ionized using microwaves, in which microwaves 30 are irradiated in an impregnated state. According to claim 1,
The thin film 20 is formed by applying a sodium silicate solution to the surface of the PP container 10 and then irradiating the microwave 30 so that silicon dioxide is deposited on the surface of the PP container 10. Soft ionized using a microwave A method for manufacturing contact lenses. 3. The method of claim 2,
The microwave 30 is irradiated for 1-5 seconds and the thin film 20 is formed in multiple layers by repeating an on-off control method that stops for 1-5 seconds. Soft contact ionized using microwaves Lens manufacturing method.

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