JP3301638B2 - Golden reflector and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gold reflector applicable to outer layer parts, eyeglass rims, stationery, ornaments, ornaments, optical parts, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art It has been known that copper-based alloys, nitrides and carbides such as titanium and tantalum, etc. exhibit a color similar to golden under certain conditions. As technology, it is used for various ornaments and exterior cases. However, none of the conventional materials is completely golden. In addition, nitrides require a long time to form a film, and copper alloys have disadvantages such as easy formation of oxides and chlorides and a problem in corrosion resistance.

[0003]

SUMMARY OF THE INVENTION It is a primary object of the invention of the present application to provide a gold reflector which can be recognized by many humans as almost perfect golden color, and a method of manufacturing the same.

[0004]

This and other objects are attained by the following inventions (1) to (8). (1) having a reflection control layer directly or via another transparent layer on a substrate having a surface containing 80 at% or more of silver,
The wavelength distribution of light reflectance on the reflection control layer side indicates that the reflectance is R
(%), When the wavelength of light is λ (nm), λ = 450 to
In the visible light region of 800 nm, (λ, R) = (450,
0), (450, 45), (550, 100), (80
0,100), (800,80), (600,80),
A gold reflector on a straight line connecting the points of (450, 0) in order and within a range surrounded by the straight line. (2) The gold color of the above (1), wherein the substrate has a silver-based film having a film thickness of 40 nm or more and a silver content of 80 at% or more, directly or through another layer on the substrate. Reflector. (3) When the real part n and the imaginary part k of the complex optical constant of the reflection control layer are λ = 450 to 800 nm and 1.5 ≦ n ≦ 5.0,
The gold reflector of (1) or (2) above, wherein 0.001 ≦ k ≦ 3.0 and the thickness t of the reflection control layer is 4 nm ≦ t ≦ 500 nm. (4) The gold reflector according to any one of (1) to (3), further including a transparent protective layer on the reflection control layer. (5) When a reflection control layer is provided directly or via another transparent layer on a substrate having a surface containing 80 at% or more of silver, the wavelength distribution of light reflectance on the reflection control layer side is determined by the reflectance. Is R (%) and the wavelength of light is λ (nm), λ = 4
In the visible light region of 50 to 800 nm, (λ, R) = (45)
0,0), (450,45), (550,100),
(800, 100), (800, 80), (600, 8)
A method of manufacturing a gold reflector having a thickness of the reflection control layer so as to fall on a straight line connecting points (0) and (450, 0) in order and within a range surrounded by the straight line. (6) The production of the gold reflector according to (5), wherein the substrate has a film having a thickness of 40 nm or more and a silver content of 80 at% or more directly or through another layer on the substrate. Method. (7) When the real part n and the imaginary part k of the complex optical constant of the reflection control layer are λ = 450 to 800 nm, 1.5 ≦ n ≦ 5.0,
(5) or (6), wherein the thickness t of the reflection control layer satisfies 0.001 ≦ k ≦ 3.0 and the thickness t of the reflection control layer satisfies 4 nm ≦ t ≦ 500 nm. (8) The method for producing a gold reflector according to any one of the above (5) to (7), further comprising providing a transparent protective layer on the reflection control layer.

[0005]

The concept of pseudo-golden color which has been proposed or put to practical use is to use a golden-colored substance, more specifically, a substance having a reflection and absorption spectrum similar to that of gold, in order to approximate the golden color. Since neither reflection nor absorption spectrum could be the same as gold, it did not appear completely golden. In contrast, the invention of this application
This is a new concept of providing a reflection control layer on a silver layer to obtain a golden color. That is, in order to obtain reflection in silver and obtain a reflection spectrum similar to that of gold, a reflection control layer having a specific absorption is used. As a result, a reflector that is much closer to the golden color is realized as compared with the related art.

[0006]

[Specific Structure] Hereinafter, a specific structure of the invention of this application will be described in detail.

The surface of the substrate of the invention of this application is mainly composed of silver. That is, the substrate may be silver itself or may have a silver film on the surface of the substrate. In addition, “mainly silver” means that silver is 80 at% or more, especially 85 to 10
It is preferably 0 at%. Such a site mainly composed of silver is preferably present in a range of at least 40 nm or more on the surface of the substrate. When a silver film is provided on the surface of the base material, the silver film usually has a thickness of about 40 nm to 0.5 mm. The material of the base material is not particularly limited, and an intermediate base layer may be provided between the base silver films.

[0008] Such a silver base is provided with a reflection control layer. When the real part of the complex optical constant in the wavelength range of λ = 450 to 800 nm is n, the imaginary part is k, and its thickness is t, n = 1.5 to 5.0 and k = 0.0
It is preferable that 0 to 3.0 and t = 4 to 500 nm. With such an optical constant, the film thickness t for obtaining a reflection spectrum profile described later in detail can easily be experimentally obtained within the above-described film thickness t range.

As the material having n and k, various inorganic materials can be used, and oxides such as Si, Zn, and Al, nitrides, carbides, carbons, and the like can be used alone or as a mixture.

[0010] Such a reflection control layer may be formed directly on the substrate surface, or a transparent layer may be formed between the reflection control layer and the substrate surface. Λ of transparent layer = 45
N and k at 0-800 nm are n = 1.0-3.0,
It is preferable that k is about 0.001 to 2.0, and the thickness is usually about 2 to 500 nm.

The reflection control layer is generally formed by various vapor deposition methods such as sputtering. At this time, the film thickness is controlled so that the reflectance spectrum of the reflection control layer has a predetermined profile. In the profile of the reflectance spectrum, the reflectance R at a wavelength λ = 450 to 800 nm is obtained.
is important. This is because by controlling R in this wavelength range to be within a predetermined range, many people will see the color almost golden.

R (%) at λ = 450-800 nm
Are the points A (450, 0) and B at (λ, R) in FIG.
(450, 45), C (550, 100), D (80
0,100), F (800,80), F (600,8
0) and A in order, and must be within the range enclosed by the straight line. In addition, 450 nm
It has been found that there is no limit for R at λ below and above 800 nm. FIG. 1 shows a reflectance spectrum of a 200 nm sputtered film of 24 gold (6-9 or more). The reflectance spectrum profile required by the invention of this application is very similar to the reflectance spectrum of gold. According to the invention of this application, as long as the thickness of the silver underlayer is controlled and a reflection control layer exhibiting a gold-like reflection spectrum in a predetermined wavelength range is provided, a large number of people evaluate the color as golden. . Such a fact was unexpected.

Various transparent protective layers may be provided on such a reflection control layer.

[0014]

EXAMPLES Hereinafter, the present invention will be described in more detail by showing specific examples of the present invention. Example 1 A plate having a silver content of 95% was placed in a vacuum chamber, and Si
Was subjected to DC sputtering, and a film was formed to a thickness of 9 nm under the following conditions.

Target: Si (B-doped) Input power: 1 DCkW Vacuum degree: 0.2 Pa Gas type: Ar Gas flow rate: 100 sccm Sputtering time: 30 sec

X-ray analysis confirmed that the film was an amorphous Si film.

Example 2 A 200 nm Ag thin film was formed on a plastic substrate by sputtering under the following conditions.

Target: Ag Input power: 500 DC kW Vacuum degree: 0.8 Pa Gas type: Ar gas flow rate: 10 sccm Sputtering time: 70 sec

Further continuously, SiO 2 was used as a target.
Was used to perform sputtering on the Ag thin film, and a 160 nm SiO film was formed under the following conditions.

Target: SiO Input power: RF 300 W Vacuum degree: 0.5 Pa Gas type: Ar gas flow rate: 10 sccm Sputtering time: 520 sec

Example 3 A silver watch was sputtered under the following conditions to form a 20 nm SiN film under the following conditions.

Target: Si Input power: RF 300 W Vacuum degree: 0.8 Pa Gas type: Ar + N ₂ mixed gas Gas flow rate: Ar 18 sccm N _{2 2} sccm Sputtering time: 200 sec

The reflection spectra of Examples 1 to 3 are shown in FIGS. Table 1 below shows the relationship between λ and R in each example and gold.

[0024]

[Table 1]

From these results, it can be seen that Examples 1 to 3 satisfy the condition of the reflection spectrum profile of the invention of this application. Then, as a result, the sample of each example was shown to 200 men and women of various ages five times alternately with the sample of 24 gold.
As many as 24% said they cost 24.

[0026]

According to the present invention, a pseudo-golden color that appears to many people to be gold is realized. Also, the corrosion resistance is good.

[Brief description of the drawings]

FIG. 1 is a graph for explaining conditions required for a profile of a reflection spectrum according to the invention of this application.

FIG. 2 is a reflection spectrum of Example 1 of the present application.

FIG. 3 is a reflection spectrum of Example 2 of the present application.

FIG. 4 is a reflection spectrum of Example 3 of the present application.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C23C 14/00-14/58 C01B 33/02 C01B 33/12

Claims (8)

(57) [Claims] 1. A reflection control layer is provided on a substrate having a surface containing at least 80 at% of silver, directly or via another transparent layer, and the wavelength distribution of light reflectance on the reflection control layer side is reflected. Rate R
(%), When the wavelength of light is λ (nm), λ = 450 to
In the visible light region of 800 nm, (λ, R) = (450,
0), (450, 45), (550, 100), (80
0,100), (800,80), (600,80),
A gold reflector on a straight line connecting the points of (450, 0) in order and within a range surrounded by the straight line. 2. The substrate according to claim 1, wherein the substrate has a thickness of 40 nm or more, directly or through another layer, and has a silver content of 80 at%.
The gold reflector according to claim 1, comprising the above-mentioned film mainly composed of silver. 3. The real part n of the complex optical constant of the reflection control layer
And the imaginary part k is λ = 450 to 800 nm and 1.5 ≦ n ≦
3. The gold reflector according to claim 1, wherein 5.0, 0.001 ≦ k ≦ 3.0, and the thickness t of the reflection control layer is 4 nm ≦ t ≦ 500 nm. 4. The gold reflector according to claim 1, further comprising a transparent protective layer on said reflection control layer. 5. When a reflection control layer is provided directly or via another transparent layer on a substrate having a surface containing at least 80 at% of silver, the wavelength distribution of light reflectance on the reflection control layer side is as follows: The reflectance is R
(%), When the wavelength of light is λ (nm), λ = 450 to
In the visible light region of 800 nm, (λ, R) = (450,
0), (450, 45), (550, 100), (80
0,100), (800,80), (600,80),
A method of manufacturing a gold reflector having a thickness of the reflection control layer so as to be on a straight line connecting the points of (450, 0) in order and within a range surrounded by the straight line. 6. The substrate has a thickness of 40 nm or more and has a silver content of 80 at%, directly or through another layer on the substrate.
6. The method for manufacturing a gold reflector according to claim 5, comprising the above film. 7. The real part n of the complex optical constant of the reflection control layer
And the imaginary part k is λ = 450 to 800 nm and 1.5 ≦ n ≦
7. The method according to claim 5, wherein 5.0, 0.001 ≦ k ≦ 3.0, and the thickness t of the reflection control layer is 4 nm ≦ t ≦ 500 nm. 8. The method according to claim 5, further comprising providing a transparent protective layer on the reflection control layer.