JPH07113710B2 - sunglasses - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to sunglasses, and more particularly, to a light-shielding lens in which the transmitted light has a gray or amber color tone while the appearance has a color tone due to various dyeings.

The sunglasses of the present invention are used as sunglasses for various purposes such as leisure and fashion.

[Prior Art and Problems Thereof] Various colored plastic lenses obtained by dyeing a plastic lens with a dye in a desired color tone are commercially available. Japanese Patent Publication No. 53-39910 discloses a colored plastic lens in which a specific dye is added to a diethylene glycol bisallyl carbonate polymer in order to have an antiglare effect.

However, when these colored plastic lenses are used as sunglasses, they often have poor wearability due to the color tone of the lenses. That is, the color of the lens is red, blue,
When the color tone is close to the primary color such as green, the color tone of the object or landscape looks unnatural and the visibility is poor, and even after wearing and removing the sunglasses, a color close to the color tone of the lens is a residual image. Inconvenience occurs.

Here, the visibility will be further described. Whether the object, the scenery, or the visibility when wearing the sunglasses is determined by the spectral transmittance characteristic of the lens. In order to be able to see objects and landscapes naturally without disturbing the color balance, it is necessary for the curve of the spectral transmittance characteristics to be flat in the wavelength range of 500 to 640 nm.

When the curve of the spectral transmittance characteristic is flat in the wavelength range of 500 to 640 nm, the color tone of transmission of the lens is gray. Also the wavelength
When the transmittance on the long wavelength side is 10 to 25% higher than that on the short wavelength side within the range of 500 to 640 nm, the color tone of transmission of the lens becomes amber, but the lens of this amber color tone also has visibility. It is good.

Therefore, as the colored plastic lens, a gray or amber color is mainly used in consideration of the visibility of the above objects and scenery, but the coloring of the plastic lens is limited to the above two colors. Has been a major obstacle when using colored plastic lenses for fashion sunglasses and the like. This can be easily understood considering that colorful and fashionable plastic frames have become popular recently as eyeglass frames, and the color scheme cannot be balanced between these colorful plastic frames and gray or amber plastic lenses. Is.

Further, Japanese Patent Laid-Open No. 233701/1986 discloses a plastic lens having a mirror coating layer formed on the surface of the plastic lens, the mirror coating layer being a multilayer film including a thin metal film of chromium or titanium and a thin metal oxide film of chromium oxide or titanium oxide. A lens is disclosed, and the mirror-coated plastic lens has an appropriate light-shielding function by the action of absorbing and reflecting visible light by the mirror-coating layer, and the color tone of transmission is gray or amber, and Although it is excellent in the visibility of the scenery, the color tone of the appearance has a color tone peculiar to the mirror coat layer, and there is a problem in terms of fashionability like the above-mentioned colored plastic lens.

The present invention has been made in order to eliminate such a problem, and while the appearance color tone exhibits various color tones due to dyeing, the transmitted light exhibits gray or amber color tone, and the sunglasses having excellent visibility. It is intended to provide.

[Means for Solving the Problems] The above-mentioned object is to provide a reflective film that selectively reflects visible light in a wavelength range of a similar color to the dyed color on the surface of the dyed plastic lens. , The reflective film comprises a high refractive index film and a low refractive index film, each having an optical thickness of λ / 4.
This is achieved by sunglasses which is a multilayer film formed by sequentially laminating 6 to 18 layers so that (2m + 1) (m is 0 or 1, 430 nm ≦ λ ≦ 700 nm).

Hereinafter, the present invention will be described in detail.

The lens used as the base material in the sunglasses of the present invention is a plastic lens, and the most preferable one is a polymer (CR-39) obtained by polymerizing a monomer mixture containing diethylene glycol bisallyl carbonate as a main component by a conventional method. However, a plastic lens other than the above polymer may be used as long as it can be dyed with a dye.

In the present invention, the plastic lens is dyed with a dye to give a desired appearance color tone such as blue, green and orange. This dyeing is preferably performed by immersing the plastic lens in a solution of the disperse dye.
It is desirable to use a monochromatic disperse dye as the dye,
It is also possible to use a mixture of two or more disperse dyes. The dye concentration is preferably 30 to 95% at the peak of light absorption.

In the sunglasses of the present invention, obtained by the above method, the surface of the dyed plastic lens is provided with a reflective film that selectively reflects visible light in a wavelength range of the dyed color and a similar color. There is.

This reflective film is composed of a high refractive index film and a low refractive index film, each having an optical thickness of (M is 0 or 1,430 nm ≦ λ700 nm)
It is a multilayer film formed by sequentially stacking 18 layers.

Zirconium oxide is preferable as the material for the high refractive index film used for the reflective film, but titanium oxide, cerium oxide, indium oxide, neodymium oxide, tantalum oxide, etc. can be used. As the substance for the low refractive index film, silicon oxide is preferable, but magnesium fluoride or the like can be used as well. .

The order of stacking may be high, low, high, low, ... high, low or low, high, low, high ... low, high, and the total number of layers is As described above, it has 6 to 18 layers.

Further, as the stacking method, vacuum deposition is particularly preferable, but an ion sputtering method or the like is also possible. When the total number of laminated layers is small, the reflectance of the film is low and the reflectance increases as the number of layers increases. The reflectance is about 6 when the number of layers is 6.
30%, about 95% for 14 layers.

The function of the reflective film in the sunglasses of the present invention will be described below. That is, the dyed plastic lens has a wavelength range showing a high transmittance in the visible light wavelength range corresponding to the dyed color, but the surface of this dyed plastic lens has a similar color to the dyed color. If a reflective film that selectively reflects visible light in the wavelength range is provided, the spectral transmittance characteristic curve of sunglasses
It becomes almost flat at 500 to 640 nm, or the transmittance on the long wavelength side of this wavelength range is about 10 to 25% higher than on the short wavelength side,
As a result, the color tone of transmitted light can be gray or amber which is excellent in the visibility of landscapes and objects without impairing the appearance color tone such as blue, green, and orange.

[Examples] Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Example 1 A synthetic resin lens was obtained by polymerizing a monomer mixture containing diethylene glycol bisallyl carbonate as a monomer for a synthetic resin lens as a main component. The spectral transmittance curve of this synthetic resin lens is shown in FIG.

5g (0.5wt%) of blue-colored dye (Mitsubishi Kasei Kogyo Co., Ltd., Dyanix Blue RN-E) and 2g (0.2wt% of dyestuff stabilizer (Hoya Co., Ltd. Hoya Stabilizer) for 1 water. %) Is added to prepare a dyeing solution, and the synthetic resin lens is immersed in this dyeing solution at a dyeing solution temperature of 90 ° C. for 20 minutes so that a peak of a peak appears near a wavelength of 430 nm as shown in FIG. A dyed synthetic resin lens exhibiting a clear blue color was obtained.

Next, zirconium oxide and silicon oxide are alternately deposited on this dyed synthetic resin lens in a vacuum chamber, and the total thickness of each layer is λ / 4 when the maximum reflection wavelength of visible light of 480 nm is λ / 4. Example 1 of the present invention in which a reflective film made of is formed.
Got the sunglasses.

The spectral transmittance curve of this sunglasses is shown in FIG. First
From the figure, the sunglasses of Example 1 of the present invention are 450 nm to 600 nm.
Results in a nearly flat characteristic curve, and the transmitted light becomes gray,
The spectral transmittance became 15%.

The spectral reflectance curve of the sunglasses of Example 1 of the present invention is shown in FIG. From Fig. 2, the color tone of the appearance is blue due to the reflection of the bluish color centered at the wavelength of 480 nm.

Example 2 5 g (0.5 wt%) of dye (Dyanix Turkis Blue B-FS manufactured by Mitsubishi Kasei Kogyo Co., Ltd.) and 2 g of surfactant (dye stabilizer Hoya Stabilizer manufactured by Hoya Co., Ltd.) per 1 water. 0.2 wt%) is added to prepare a dyeing solution, and a synthetic resin lens similar to that used in Example 1 is immersed in this dyeing solution at a dyeing solution temperature of 90 ° C. for 3 hours to give a blue dyeing synthetic resin lens. Got

Next, for 1 part of water, 5 g (0.5 wt%) of dye (Dyanix Orange BFE-200 manufactured by Mitsubishi Kasei Co., Ltd.) and 2 g (0.2 wt% of Hoya stabilizer, a dye stabilizer Hoya Co., Ltd.) are used. ) Is added to prepare a dyeing solution, and the dyeing synthetic resin lens is immersed in this dyeing solution at a dyeing solution temperature of 85 ° C. for 5 minutes, and a peak at about 520 nm as shown by the spectral transmittance curve in FIG. A dyed synthetic resin lens exhibiting a green color having a peak of was obtained.

Next, when the zirconium oxide and the silicon oxide are alternately deposited on this dyed synthetic resin lens in the vacuum chamber and the maximum reflection wavelength of visible light of 520 nm is λ, the film thickness of each layer is λ / 4 in total 12 A reflective film composed of layers was formed to obtain sunglasses of Example 2 of the present invention.

The spectral transmittance curve of this sunglasses is shown in FIG. 6 and the spectral reflectance curve is shown in FIG.

From FIG. 6 and FIG. 7, it is clear that the transmitted light has a gray color and the external color tone is green.

Example 3 5 g (0.5 wt%) of dye (diaceritone first brown 4R manufactured by Mitsubishi Kasei Co., Ltd.) and 2 g (0.2 wt% of hoya stabilizer manufactured by Hoya Co., Ltd., a dye stabilizer) per 1 water. Was added to prepare a dyeing solution, and a synthetic resin lens similar to that used in Example 1 was immersed in this dyeing solution at a dyeing solution temperature of 83 ° C. for 5 minutes, and a spectral transmittance curve is shown in FIG. A dyed synthetic resin lens exhibiting a bright orange color was obtained.

Next, zirconium oxide and silicon oxide are alternately deposited on this dyed synthetic resin lens in a vacuum chamber, and the film thickness of each layer becomes λ / 4 when the maximum reflection wavelength 600 nm of visible light is λ. A 12-layer reflective film was formed to obtain the sunglasses of Example 3 of the present invention.

The spectral transmittance curve of this sunglasses is shown in FIG. 9 and the spectral reflectance curve is shown in FIG.

It is clear from FIGS. 9 and 10 that the transmitted light has a gray color and the appearance color tone is orange.

Example 4 A synthetic resin lens similar to that used in Example 1 was applied to a dyeing solution using the same blue dye as in Example 1 at a dyeing solution temperature of 90 ° C. 6
A dyed synthetic resin lens exhibiting a blue color was obtained by dipping for a minute. The dyeing density at this time was about 20% lighter in the vicinity of the wavelength of 585 nm than that of the dyed synthetic resin lens of Example 1.

A multilayer reflective film consisting of a total of 12 layers of zirconium oxide and silicon oxide was formed on this dyed synthetic resin lens in the same manner as in Example 1 to obtain sunglasses of Example 4 of the present invention.

The spectral reflectance curve of this sunglasses is shown in FIG.

From FIG. 11, the sunglasses of Example 4 of the present invention has a wavelength of 460 nm.
The transmittance on the short wavelength side in 640 nm was lower than that on the long wavelength side, and the transmitted light had an amber color.

The spectral reflectance curve of this sunglasses has the same shape as that of FIG. 2 of Example 1, and the color tone of the appearance is blue.

Comparative Example 1 FIG. 12 shows the spectral transmittance characteristics of sunglasses lenses marketed as fashionable sunglasses.

This lens is a dyed synthetic resin lens obtained by immersing the synthetic resin lens described in Example 1 in a dyeing solution using the same blue dye as in Example 1.

The transmitted light of this lens is blue and the color tone of its appearance is also blue, but when this lens is worn as sunglasses, the color tone of landscapes and objects looks bluish and looks unnatural, and this sunglasses is used for a long time. After wear and after removing, you can also feel the afterimage that the color tone of scenery and objects looks reddish.

Therefore, this lens is unsuitable for wearing as sunglasses.

Comparative Example 2 Zirconium oxide and silicon oxide were alternately deposited in a vacuum chamber in the same manner as in Example 1 without dyeing the same synthetic resin lens as that used in Example 1, and the maximum reflection wavelength of visible light was obtained. When 480 nm is λ, a multilayer film consisting of a total of 12 layers with the thickness of each layer being λ / 4 is formed,
A lens having a spectral transmittance characteristic as shown in FIG. 13 was obtained.

The color tone of the appearance of this lens is bluish, and the transmitted light is orangeish. If you wear this lens as sunglasses,
The color tone of landscapes and objects is orange, and the appearance is unnatural, and bluish afterimages are felt after wearing, and it is not suitable for wearing as sunglasses.

[Effects of the Invention] According to the sunglasses of the present invention, since the color tone of transmitted light is gray or amber without impairing the color tone of the appearance of the colored lens, it is a fashionable colorful lens, but it is natural. You can see objects and landscapes in various colors and it has excellent visibility. Conventionally, in a colorful colored lens, an object or a landscape looks unnatural and an afterimage is felt when the sunglasses are worn and then removed, but the sunglasses of the present invention have no afterimage and are highly wearable.

[Brief description of drawings]

FIG. 1 is a spectral transmittance characteristic diagram of the sunglasses of Example 1, FIG. 2 is a spectral reflectance characteristic diagram of the sunglasses, and FIG. 3 is a synthetic resin lens before dyeing used as a substrate in Example 1. Spectral transmittance characteristic diagram, FIG. 4 is a spectral transmittance characteristic diagram of the dyed synthetic resin lens before the reflection film is provided in Example 1, and FIG. 5 is a dyed synthetic resin lens before the reflection film is provided in Example 2. FIG. 6 is a spectral transmittance characteristic diagram of the lens, FIG. 6 is a spectral transmittance characteristic diagram of the sunglasses of Example 2, FIG. 7 is a spectral reflectance characteristic diagram of the sunglasses, and FIG. FIG. 9 is a spectral transmittance characteristic diagram of the dyed synthetic resin lens before, FIG. 9 is a spectral transmittance characteristic diagram of the sunglasses of Example 3, FIG. 10 is a spectral reflectance characteristic diagram of the sunglasses, and FIG. 11 is of Example 4. Spectral transmittance characteristic diagram of the light-shielding lens, FIG. 12 is comparative example 1 Spectral transmittance characteristic diagram of a lens, Fig. 13 is a spectral transmittance characteristic of the lens in Comparative Example 2.

Claims (2)

[Claims] 1. On the surface of a dyed plastic lens,
A reflective film that selectively reflects visible light in a wavelength range similar to the dyed color is provided, and the reflective film includes a high refractive index film and a low refractive film, each having an optical thickness. λ / 4 (2m +
1) Sunglasses characterized by being a multilayer film formed by sequentially laminating 6 to 18 layers so that (m is 0 or 1, 430 nm ≦ λ ≦ 700 nm). 2. The high refractive index film is made of zirconium oxide,
The sunglasses according to claim 1, wherein the low refractive index film is made of silicon oxide.