JPH0293422A - Light shielding spectacles lens - Google Patents

Abstract

PURPOSE:To constitute the spectacles lens so that it is excellent in a light shielding effect in each area, and also, can discriminate exactly each color under various light sources by dyeing a synthetic resin lens to which an ultraviolet ray absorbent is added to a brown system or a gray system, and coating a vacuum vapor-deposited film thereon. CONSTITUTION:A synthetic resin lens 2 is obtained by adding an ultraviolet ray absorbent to a synthetic resin use monomer, and thereafter, polymerizing it. This lens 2 is brought to dyeing working to a color tone of a brown system or a gray system by using two kinds of more of disperse dyes selected from among orange system, yellow system and red system disperse dyes, and a turkish blue system disperse dye. By laminating successively and repeating a high refractive index film 3 and a low refractive index film 4 on said lens by a vacuum vapor-deposition method, a coating film is formed. As a result, the title lens shown an excellent light shielding effect in each ultraviolet, infrared and visible area, and protects eyes of an aircraft pilot. Also, since each color is brought to light shielding on an average in the visible area, each color is discriminated exactly under variout light sources.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a light shielding spectacle lens.

<Prior art> When living tissue is affected by radiation, the living tissue absorbs the radiation, and its absorption characteristics vary depending on the wavelength of the radiation and the location of the living tissue, but visible light and infrared rays reach the retina in eye tissue. , is known to cause severe and lasting damage to the iris, retina, choroid, etc. when it acts for a long time or with intensity. In addition, ultraviolet rays are well absorbed by the cornea and crystalline lens, and when they act for a long time or in a strong manner, they can eventually cause electrical ophthalmia, which is thought to be a remote cause of cataracts. The degree of influence of radiation on eye tissues also differs depending on the environment to which the living body is exposed. For example, when airline pilots fly at high altitudes professionally,
For a long time, it is exposed to an amount of light that is incomparable to the ground. The amount of light in the cockpit of an airplane is blocked by the cockpit windows, but the amount of light in the sky is incomparable to that on the ground. It is said to exceed that of . In this way, people who work under sunlight that is stronger than in their living environment under normal sunlight should wear light-blocking glasses that are suitable for the environment to which they are exposed to protect their eyes. It is preferable to wear it.

Synthetic resin lenses, which are the material for lenses for light-shielding glasses, are known to have diethylene glycol bisallyl carbonate as their main component.
It has excellent properties in light weight, impact resistance, and dyeability, and is popular as a highly safe lens. In addition, a light-shielding eyeglass lens has been developed in Japanese Patent Application Laid-Open No. 52-15049, which has fusion properties and ultraviolet shielding effects added to the above-mentioned resin lens.
This is proposed in Publication No. 2.

Furthermore, synthetic resin lenses that absorb ultraviolet light and use specific dyes and ultraviolet absorbers for the purpose of anti-glare effects were published in 1973.
This method is proposed in Japanese Patent No. -39910. In addition, most commercially available sunglasses are mainly designed to block visible light, and their materials include acrylic resin, polycarbonate resin, glass, etc. in addition to the resins mentioned above, and the material monomers are colored. There are a wide variety of colors, including those that are polymerized by mixing pigments.

Furthermore, a material having a function of blocking ultraviolet rays, visible light, and infrared rays and having fashionability has been proposed in Japanese Patent Laid-Open No. 62-254119.

<Problem to be solved by the invention> As described above, the main purpose of existing sunglasses, both glass and plastic, is to block visible light, and it is also essential to meet fashion requirements. However, it is not always possible to satisfy the requirement of protecting the eyes from various types of light such as ultraviolet light, visible light, and infrared light.

Also, Japanese Patent Application Publication No. 52-150492, Japanese Patent Publication No. 53-3
As disclosed in Japanese Patent No. 9910, it is known to add an ultraviolet absorber for the purpose of blocking ultraviolet rays and to form a lens. However, there are many types of UV absorbers; for example, even benzophenone UV absorbers have different wavelength absorption characteristics depending on the type, and even when used in the same amount, the UV shielding effect will differ, and even in larger amounts, When an ultraviolet absorber is used, there are problems such as interfering with lens polymerization, making it impossible to mold the lens, and furthermore causing the lens to be colored yellow and changing its color tone. The dye used to dye the lens is
There are problems in that the color tone and wavelength absorption characteristics vary depending on the type of dye used, and the light blocking ability also varies.

Furthermore, although the method described in JP-A No. 62-254119 can block ultraviolet rays, visible light, and infrared rays, it does not sufficiently block light in the wavelength range exceeding about 620 nm, so it cannot be used with tungsten lamps, fluorescent lamps, Illuminated objects using various light sources such as halogen lamps, transmissive indicator lights,
The function of light-shielding glasses is not sufficient, as the colors of self-luminous indicator lights and the like can be perceived as different colors when viewed with the naked eye, and color displays and warning colors can be misidentified.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide excellent light shielding functions for ultraviolet rays, visible light, and infrared rays, and to provide various lamps such as tungsten lamps, fluorescent lamps, and halogen lamps. It is an object of the present invention to provide a light-shielding eyeglass lens that can clearly identify the color of an illuminated object, a transmission type indicator light, a self-luminous type indicator light, etc. using a light source.

The above-mentioned problem can be solved by adding an ultraviolet absorber to a synthetic resin monomer and then polymerizing the resulting synthetic resin lens using orange, yellow, and red disperse dyes. Chosen 2
The material was dyed to a brown or gray tone using a variety of disperse dyes and a turquoise blue disperse dye, and then a high refractive index film and a low refractive index film were sequentially laminated to form a coating film. This problem has been solved by the use of light-shielding eyeglass lenses.

In the present invention, monomers for synthetic resins include those containing diethylene glycol bisallyl carbonate as a main component, but other monomers can also be used as long as they form plastic lenses by polymerization.

In the present invention, the ultraviolet absorber added to the monomer for synthetic resin lenses is 2,2'-dihydroxy-4
-Methoxybenzophenone is particularly preferred, and the amount used is determined based on the amount of monomer as the main component of the synthetic resin lens material.
Preferably it is 0.01% to 4% by weight, particularly preferably 0.1% to 2% by weight. The reason is 0.01
If the amount is less than 4% by weight, the ultraviolet ray blocking effect will be weak, and if it exceeds 4% by weight, the degree of polymerization will be affected and the lens will become brittle, which is unfavorable in terms of moldability.

Orange, yellow, and red disperse dyes used in the present invention include monoazo, disazo, anthraquinone, nitro, styryl, methine, aroylenebenzimidacumarin, quinonaphthalone, and aminonaphthylimide. Examples include disperse dyes such as naphthoquinoneimine, coumarin, and the like.

In the present invention, using two or more types of disperse dyes selected from orange, yellow, and red disperse dyes means using two or more different types of disperse dyes from among the above three types of disperse dyes. The reason why two or more types of disperse dyes are used is to produce a brown or gray color tone together with the blue disperse dye described below.

Further, as the blue dye, a turquoise blue disperse dye is used. The reason for this is that when the lens is dyed using a turquoise blue disperse dye, it is possible to block light in the wavelength range of 620 rv to 670 r+m, as will be clear from the examples described below. A preferred example of such a turquoise blue disperse dye is Color Index (CI) K Disperse Blue, 60,87,181.
189.198° is used.

Note that it is not preferable to use blue disperse dyes other than those mentioned above. When lenses are dyed using a blue disperse dye other than turquoise blue disperse dye, approximately 620
Wavelengths up to rv can be blocked, but from 620 nm to 67
Light shielding in the wavelength range at 0 rv is insufficient, and color differences may occur due to illuminated objects using various light sources such as tungsten lamps, fluorescent lamps, halogen lamps, transmissive indicator lights, self-luminous indicator lights, etc. This is because they cannot be clearly identified.

The dyeing conditions for the dyeing process in the present invention vary depending on each element technology such as dyeing concentration, dyeing temperature, and immersion time, and the applicable range of dyeing is wide, but the dyeing concentration is 0.01% by weight from the viewpoint of light blocking ability and dyeing reproducibility. ~5 times%, immersion time is 10 minutes ~ 6 hours (preferably 20 minutes ~ 3 hours), dyeing temperature is 60 ° C ~
The temperature is preferably 100°C (preferably 80°C to 90°C).

In the present invention, the color tones are limited to brown and gray as they have particularly excellent color balance. That is, the spectral transmittance curve has a different wavelength absorption band depending on the color tone. For example, a yellow lens has an absorption band around 57 S nm, and a flat transmittance curve can be obtained in the wavelength range of 500 rv to 670 nm. I can't.

Therefore, brown and gray colors are selected as colors in which the transmittance curve in the vicinity of the wavelength range of 500 r+m to 670 nm changes in a nearly flat manner.

The transmittance in this band can be controlled depending on the purpose of use, and the method of blocking light can be adjusted by adjusting the dyeing conditions of the dyeing process, such as dyeing time and dipping time. Lenses colored gray or brown can be colored by mixing orange, yellow-red, or blue dyes, or by immersing them in a single-color dyeing tank, but there are no restrictions on the method.

The light-shielding eyeglass lens of the present invention has a coating film in which a high refractive index film and a low refractive index film are sequentially laminated on a dyed synthetic resin lens.

Zirconium oxide is particularly preferred as the material for the high refractive index film used in this coating film, and titanium oxide, cerium oxide, indium oxide, neodymium oxide, and tantalum oxide can also be used. Silicon oxide is particularly preferred as the material for the low refractive index film, and magnesium fluoride can also be used.

The order of stacking may be high, low, ... high, low, or low, high, ... low, high,
If the number of layers is 4 to 20, the preferable effect is 11?
The number of layers and the reflected wavelength range are inversely proportional, and the reflectance is proportional.

The optical film thickness is preferably λ/4 (λ is the wavelength), and the method of laminating the vapor deposition material is particularly preferably vacuum evaporation.
Ion sputtering method etc. are also possible.

Effect> The light-shielding spectacle lens of the present invention is obtained by polymerizing a monomer for synthetic resins to which an ultraviolet absorber is added.

Further, the lens is dyed in a gray or brown color with a disperse dye, and a dyed layer is formed on the lens surface. Furthermore, since a coating film in which a high refractive index film and a low refractive index film are sequentially laminated is formed on the surface of the dyed lens,
Ultraviolet rays, visible rays, and infrared rays are blocked, and the amount of harmful ultraviolet rays and infrared rays that reach the eyeballs is small, preventing eye damage caused by light rays. In addition, it is dyed in a color tone that does not impair color balance and has an anti-glare density, so you can easily see objects through the lens, as well as traffic signs, etc.
The colors of meter display lights and illuminated objects using various light sources can be identified without any change from when viewed without passing through a lens.

<Example> Examples of the present invention will be described in detail below.

<Example 1> Fig. 1 is a partially enlarged sectional view of a light-shielding eyeglass lens 1 according to an example of the present invention. A dyed synthetic resin lens 2 obtained by dyeing a synthetic resin lens obtained by polymerization after addition of an absorbent is laminated with a high refractive index film 3 made of zirconium oxide and a low refractive index film 4 made of silicon oxide.

Further, a dyed layer 2a dyed brown with a disperse dye is formed on the surface layer of the dyed synthetic resin lens 2.

Further, the optical thickness of the high refractive index film 3 and the low refractive index film 4 is λ
/4, and is laminated in 12 layers, for example.

Next, the manufacturing method of this light-shielding eyeglass lens 1 will be explained in detail, but the manufacturing method described here is just an example, and the present invention also includes light-shielding eyeglass lenses obtained by modification of the manufacturing method that is obvious to those skilled in the art. It is included.

99.85% by weight of diethylene glycol bisallyl carbonate as a synthetic resin lens monomer and 0.15% by weight of 2,2'-hydroxy-4-methoxybenzophenone as an ultraviolet absorber were sufficiently stirred with a stirrer, and diisopropyl peroxide was added as a polymerization initiator. Oxycarbonate (I
PP) was added at a ratio of 3 parts to 100 parts of the monomer and stirred to obtain a mixed solution. Next, the mixed solution was poured into a lens molding mold consisting of a glass mold and a resin seal, and cast polymerization was performed in an electric furnace to obtain a synthetic resin lens.

Sumikaron Turkis Blue 0 3g (CI Daspurs Blue 60 manufactured by Jujutsu Kagaku) Resolin Orange 3
3g of GL (orange disperse dye manufactured by Bayer), 3g of Dianic Red ACE (hydrogen disperse dye manufactured by Mitsubishi Kasei), 1g of water each, surfactant (dyeing stabilizer, Hoya)
After preparing three types of dye solutions by adding 2 g of Hoya Stabilizer (manufactured by Hoya Stabilizer), the synthetic resin lenses obtained above were added to the Sumikalon Turquoise Blue G dye solution for 3 hours at a dyeing temperature of 85°C.
Next, it was immersed in Resolin Orange 3GL dye solution at a dyeing temperature of 85° C. for 10 minutes, and then in Diax Red ACE dye solution at a dyeing temperature of 85° C. for 10 minutes to obtain a dyed synthetic resin lens 2 having a dyed layer 2a. The color of the dyed synthetic resin lens 2 was brown.

Next, the dyed synthetic resin lens 2 is placed in a vacuum chamber of a vacuum evaporation device, and while keeping the lens surface temperature at 120° C. or lower, zirconium oxide is added as the material for the high refractive index film 3, and zirconium oxide is added as the material for the low refractive index film 4. A total of 12 layers (6 layers of zirconium oxide, 6 layers of silicon oxide) each having a film thickness of λ/4, where λ is the maximum reflection wavelength in the infrared region, are alternately vacuum-deposited using silicon oxide as A light shielding spectacle lens 1 was obtained by forming an ultraviolet and infrared shielding film. Here, the film thickness was controlled by monitoring the monitor glass using monochromatic photometry. The monochromatic filter wavelength is 550 nm, and the deposition is by electron beam heating.

The spectral transmittance curve (n1 was determined using a 340 self-recording spectrometer manufactured by Hitachi, Ltd.) of the light-shielding eyeglass lens 1 is as shown in FIG.

Based on the spectral transmittance curve shown in FIG. 2, the light-shielding performance of the light-shielding spectacle lens of this example against ultraviolet rays, visible light, and infrared rays is as follows. That is, in the ultraviolet region (I) (approximately 400n
(a+ or less), it blocks nearly 100% of light, and as mentioned above, this ultraviolet ray affects the cornea and crystalline lens, so it is excellent as a preventive effect.

Next, the visible light region (■) (approximately 400 nm to approximately 780
nllll). Figure 3 is a specific luminous efficiency curve showing the change in the sensitivity of the human eye to light depending on the wavelength.The luminous efficiency curve for other wavelengths is compared with the wavelength 555 na+ as 1, and it is approximately 500 nm in the wavelength range (IV). ~about 620
The area around t+m is where humans feel the brightest light, but if the wavelength band exceeding 620 nw is not blocked,
Since the color of objects illuminated using light sources such as halogen lamps and tungsten lamps and transmission type indicator lights can be clearly identified, it is necessary to block light until around 670 ns. Therefore, we created FIG. 4, which simultaneously shows the relative luminous efficiency curve in FIG. 3 and the transmittance curve in the visible light (n) region in FIG. Comparing the sensitivity curves and comparing the glare effect actually felt by the human eye with the light-shielding eyeglass lens of this example, the effect is approximately 50 On+s to approximately 670 nm.
It can be seen that it has an excellent light shielding effect in the wavelength range of 200 to 2000, and does not cause problems such as inability to distinguish the colors of illuminated objects using light sources such as halogen lamps and tungsten lamps, and of transmissive display lights.

Next, let's talk about color balance. FIG. 5 shows the spectral distribution of sunlight, and the transmittance curve in the wavelength range of 500 rv to 670 nII in FIG. 5 shows a substantially flat curve.

Similarly, the transmittance curve of the light-shielding eyeglass lens of this example shown in FIG. 2 shows a flat transmittance curve change in the wavelength range (500 rv to 670 rv), which is almost the same as sunlight Since the transmittance curve shows a change close to that of , the light shielding effect is achieved without impairing the color balance. Therefore, the color tone of the object seen through the light-shielding eyeglass lens is within the wavelength range of 500nm to 670nm as the amount of light.
In this case, the light is blocked by about 70% to 80%).
Images can be viewed with almost the same color balance as natural light, and signs such as traffic signs and instruments can also be viewed without compromising color balance.

According to Rayleigh's scattering theory, when natural light of wavelength λ is incident on a small sphere, the scattered light intensity E at the scattering angle θ and distance g from the small sphere is the periodicity, and H is the dielectric constant of the small sphere or It is a constant determined by the refractive index.

The intensity of scattered light is inversely proportional to the fourth power of the wavelength, therefore,
Light with short wavelengths is strongly scattered. On the other hand, scattered light has a disturbing effect when viewing an object, and particularly obstructs the viewing of distant objects. In particular, the light-shielding lens function desired by airline pilots requires good visibility of distant objects, and it is necessary to cut out scattered light.
It is important to cut out the light of 00 to 500 tv).

The light-shielding eyeglass lens of this example has a 500 to 670 nII+
, has a nearly flat spectral transmittance of 400 to 50
In the case of visible light having a short wavelength of 0 nm, the short wavelength has a very small transmittance, and it has a color tone close to natural light and has the effect of making it possible to visually recognize objects by cutting out scattered light that has a large disturbance effect. Also, infrared 750nffl~1200nl
This area is said to affect the retina and choroid, and is said to be caused by heat accumulation within cells, but in this example, this band is centered around 1l100n
It blocks around 5% of light and has a great light blocking effect, making it possible to block specific wavelengths of infrared rays that are considered harmful to the eyes.

Next, other performance evaluations (appearance inspection, adhesion test, solvent resistance) of this light-shielding eyeglass lens were performed using the following method.

(1) Visual inspection Using a lighting device with a fluorescent lamp as the light source, visually inspect the following items.
) to 4) were observed.

l) Transparent 2) No irregularities on the surface 3) No striae 4) No scratches on the surface (II) Adhesion test (cross cut - cellophane tape peel test) 1 on the coating film Cut the cutting line vertically to reach the base material at the same intervals.
Insert 11 strips on each side with a knife to make 100 stitches of 1 m 1 s2, stick cellophane tape on top of it, and peel it off quickly. This operation of applying and peeling off the cellophane tape was repeated three times at the same location, and it was observed whether there were any peeling holes.

(I [[) Solvent Resistance The lens was wiped with a cloth impregnated with acetone, and the lens surface was observed to see if there was any change.

The results of performance evaluations (1), (n), and (m) were all satisfactory.

<Example 2> Sumikalon Turkis Blue 0 3° (CI Dispers Blue 60 manufactured by Sumitomo Chemical ■) Diaex Orange BSE 3g (orange disperse dye manufactured by Mitsubishi Kasei ■) Diax Red ACE 3g (Red manufactured by Mitsubishi Kasei Oki) After preparing three types of dyeing solution by adding water IN and 2 g of surfactant (dyeing stabilizer, Hoya Stabilizer manufactured by Hoya) to each type of disperse dye, the synthetic resin lens obtained above was first dyed with Sumikalon tar. Immersed in Kiss Blue G dye solution at a dyeing temperature of 85°C for 3 hours, then in Dianex Orange BSE dye solution for 4 minutes at a dyeing temperature of 85°C, and then in Dianex Red ACE dye solution for 15 minutes at a dyeing temperature of 85°C to obtain gray. A light-shielding spectacle lens having a color tone of . Its spectral transmittance curve is as shown in FIG. 6, and it was as excellent as Example 1 in terms of shielding effect against ultraviolet rays, visible light, and infrared rays, and color balance.

In addition, the lenses (1) to (III) were prepared in the same manner as in Example 1.
Performance evaluations were conducted, and all results were satisfactory.

Comparative Example 1> 99.97% by weight of diethylene glycol bisallyl carbonate was added as a synthetic resin lens material monomer, and 0.03% by weight of 2.2'-dihydroxy-4-n-octoxybenzophenone was added as an ultraviolet absorber. A synthetic resin lens was manufactured using the same polymerization method as in Example 1. In addition, Dianic Sprue RN-E3ir (CI Dispers Blue 91 manufactured by Mitsubishi Kasei), Resolin Orange 3GL 3g (orange disperse dye manufactured by Bayer), and Dianic Red ACE 3g (hydrod disperse dye manufactured by Mitsubishi Kasei). Three types of staining solutions were prepared by adding water IJ7 and 2g of surfactant (dyeing stabilizer, Hoya Stabilizer manufactured by Hoya ■), respectively, and then the synthetic resin lenses obtained above were dyed with Dianic Sprue RN-E dye G1. :3 at dyeing temperature 85℃
0 minutes, then dyed with Resolin Orange 3GL dye solution for 10 minutes at a temperature of 85℃, and then dyed with Diax Red ACE.
A brown dyed lens was obtained by immersing it in a dye solution for 10 minutes at a dyeing temperature of 85°C. As shown in Figure 7, the spectral transmittance curve shows that the light shielding in the wavelength range exceeding about 620 rv is insufficient, and the color of objects illuminated by light sources with different wavelength distributions may vary, such as objects appearing red depending on the light source. It became clear that there was a problem that it could not be clearly identified, and that the function as a light-shielding eyeglass lens was insufficient.

Comparison N2 > A synthetic resin lens was manufactured using the same monomer composition and polymerization method as in Example 1. In addition, Dianic Sprue ACE 3g (CI Disperse Blue 56 manufactured by Mitsubishi Kasei), Diax Orange BSE 3g (orange disperse dye manufactured by Mitsubishi Kasei), and Dianic Red ACE 3g (hydrod disperse dye manufactured by Mitsubishi Kasei). 1 g of water 1 surfactant (dyeing stabilizer, Hoya)
After preparing three types of dye solutions by adding 2 g of Hoya Stabilizer (manufactured by Manufacturer), the synthetic resin lenses obtained above were dyed in the Dianix Sprue ACE dye solution for 30 minutes at a temperature of 85°C, and then dyed with Dianix Orange BSE dye. A gray dyed lens was obtained by immersing the lens in the dyeing solution for 5 minutes at a dyeing temperature of 85°C, and then in the Diax Red ACE dye solution for 15 minutes at a dyeing temperature of 85°C. As shown in Figure 8, the spectral transmittance curve shows that the wavelength range exceeding about 620 rv is insufficiently blocked.
It has become clear that the function as a light-shielding eyeglass lens is insufficient, as there are problems in which the color of objects illuminated by light sources with different wavelength distributions cannot be clearly distinguished, such as objects appearing red depending on the light source.

<Effects of the Invention> The light-shielding eyeglass lens of the present invention is produced by mixing a UV absorber with a synthetic resin 7-mer, polymerizing the resulting lens, dyeing it with a brown or gray dye, and then dyeing the lens surface with a brown or gray dye. Since it is formed by forming a vacuum-deposited film that has an ultraviolet and infrared light shielding effect on the substrate, it has a light shielding effect in each of the ultraviolet, infrared, and visible bands. Therefore, in protecting the eyes of airline pilots who work under strong sunlight at high altitudes, it has the effect of preventing eye damage to the cornea, retina, etc., and by blocking strong visible light, It is possible to provide safe light-shielding glasses that reduce glare. In addition, the light-shielding eyeglass lens of the present invention has a flat spectral transmittance in the wavelength range of about 500 nm to 670 r+m in the visible light range, and can transmit light of various colors from violet to blue, green, yellow, orange, and red. Since the light is blocked on average, each color can be felt without affecting the normal color balance.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged view of the light-shielding eyeglass lens of Example 1, and FIG. 2 is a partial enlarged view of the light-shielding eyeglass lens of Example 1 in the ultraviolet region, visible region,
Transmittance curve diagram in the infrared region, Figure 3 is a specific luminous efficiency curve diagram of the human eye, Figure 4 is a composite curve diagram of Figures 2 and 3,
Fig. 5 is a spectral distribution diagram of sunlight, Fig. 6 is a transmittance curve diagram in the ultraviolet region, visible region, and infrared region of the light-shielding eyeglass lens of Example 2, and Fig. 7 is a dyed lens of Comparative Example 1. FIG. 8 is a transmittance curve diagram of the dyed lens of Comparative Example 2. DESCRIPTION OF SYMBOLS 1... Light-shielding eyeglass lens, 2... Dyed synthetic resin lens, 2a... Dyed layer, 3... High refractive index film, 4... Low refractive index film.

Claims (1)

[Claims] (1) After adding an ultraviolet absorber to a synthetic resin monomer, a synthetic resin lens obtained by polymerization is mixed with two or more types of disperse dyes selected from orange, yellow, and red disperse dyes and turquoise blue. A light-shielding eyeglass lens characterized by being dyed to a brown or gray tone using a disperse dye, and then sequentially laminating a high refractive index film and a low refractive index film to form a coating film. .