JPS62264003A - Coat film for optical product - Google Patents

Abstract

PURPOSE:To improve durability, to permit free selection of a coloring density and to improve spectral transmission and reflection characteristics by using a chemical mixture having sublimatability for the purpose of vapor deposition. CONSTITUTION:The chemical mixture having the sublimatability for the purpose of the vapor deposition is used and the chemical mixture prepd. by mixing Cr2O3 and Fe2O3 which are coloring materials with Ce2O2 as a main material is used, by which said chemical is used as a high-refractive index material in the constitution of an antireflection film. The mixing ratios of the chemical are specified to <=20gr Cr2O3 and <=10gr Fe2O3 when the weight of Ce2O2 is designated as 100gr. The chemical suitable for a brown colored coating is thus obtd. The color tone can be finely changed by changing the mixing ratios of the coloring materials. The stable density and spectral reflection characteristics are thus obtd. by using the vapor deposition material for which the color tone and density are unequivocally determined with the chemical compsn. without making a laborious evaporation operation.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Technical Field The present invention relates to a coating film for optical products used for sunglasses, fashion glasses, etc., and particularly to a mixed chemical thereof.

b. Prior art and its problems Anti-reflection coatings have been applied to colored substrates in the past for sunglasses and fashion glasses, but in recent years, anti-reflection coatings have been applied to transparent substrates in order to improve in-plane density unevenness due to lens thickness. Anti-reflective coatings as well as colored coatings have been commercialized.

The film structure is divided into one colored layer and an anti-reflection film layer, and the other is one in which a coloring material is mixed into the low refractive index material or high refractive index material of the anti-reflection film.The latter is a conventional anti-reflection film. It can be manufactured in as many layers as the number of membrane layers, which is advantageous in terms of production.

In addition, even in transparent multilayer films, in order to obtain the desired spectral transmission or reflection characteristics, the number of layers increases due to the lack of a material with an appropriate refractive index, resulting in new defects and production losses.

Under the above circumstances, the development of mixed chemicals for deposition is expected.

Now, according to evaporation kinetics, the evaporation rate of an evaporated substance with molecular weight M is P/(M
It can be seen that it is proportional to TF. Therefore, when a mixed drug is used as an evaporation substance, it is preferable that each component (i) has the same p+/city at the evaporation temperature in order to obtain a practical evaporation rate. Since there are almost no problems, the following problems arise.

(a) It is very difficult to maintain the composition of the chemical and its vapor (deposited film) on the evaporation source since the mixed chemical component evaporates from the one with the highest evaporation rate.

(b) This means that the refractive index changes with the deposition time, and in the case of a colored coat, the color density changes.

(c) Also, the remaining chemicals (most of the amount filled since the amount used by evaporation is small) will be difficult to recycle (use) due to changes in the component ratio, and will have to be completely discarded6 ( d) In order to obtain coating reproducibility, it is necessary to strictly control the gas release method and preheating before coating, paying attention to the particle size and chemical temperature.

C0 Purpose In view of the above points, the present invention aims to produce a chemical that matches the chemical composition, that is, the color tone and concentration uniquely match the chemical composition, without the need for troublesome evaporation operations to stabilize the composition. The purpose of the present invention is to provide a coating film that obtains stable concentration and spectral reflection characteristics by using a determined vapor deposition material.

Means for Solving the d0 Problem The coat film of the present invention is characterized by using a mixed chemical having sublimation properties for vapor deposition, and as the mixed chemical, Ce2O2 as a main material and Cr20:l as a coloring material are used. ,
By mixing Fe203, it can be used as a high refractive index material in anti-reflection film construction, and when the mixing ratio of the chemicals is 100g of Ce2O2 by weight,
By setting Cr2O3 to 20 gr or less and Fe2O3 to 10 gr or less, it becomes suitable for brown colored coating. Furthermore, by changing the mixing ratio of one colorant, the color tone can be subtly changed.

80 action will be explained using an actual example as a colored coating chemical that becomes a vapor deposited film.

Layer The situations described in (a) to (d) above are particularly noticeable in the case of mixtures that liquefy well because the heat is uniformly distributed to all the components.
Furthermore, in the case of granules, heat conduction is very poor, and it is expected that the chemical and film composition will be maintained by evaporating in order from the surface being heated. Therefore, as a coating method, the evaporation temperature of each component of the chemical All you have to do is heat it above the highest evaporation temperature. In other words, it is only necessary to control (constantly) the deposition rate.

The soil of the present invention is made of CaO2 and 1 colorant of Cr2O:+
The colored coating chemical mixed with +Fc203 is applied to the high refractive index layer of the anti-reflection film structure due to its large refractive index, and it also reduces the brown color transmission of glasses due to the color tone of the coloring material and the absorption density formed by the amount of the coloring material mixed. Rate 96% (550nun
), but this mixed chemical exhibits sublimation properties, and the above-mentioned properties were confirmed by the following examples (experimental results).

f, Example (a) 3rd place condition (a)-1 drug shape; powder mixed drug 9.08t/cnf
Compressed and granulated to approximately 3+nm'.

(a) -2M generation method; by electron beam heating. .

(a)-3 gas release method: 1-1.5X10-'t,
After evacuation to orr, I
The processing current is increased until it reaches the value at the time of coating so as not to exceed r, and in the first stage, while maintaining that value, wait for the improvement of the current to 6 x 10-' jorr.

(a)-4 Vapor deposition rate: at a distance of about 80 cm from the evaporation source.
A λ/4 film thickness is deposited on the substrate in 2.5 to 3 minutes.

(b) Repeated use of % product (reproducibility in a single layer) Chemicals are coated continuously while being filled once.

(b)-1 Chemical composition CeO287, Ogr, Cr20
) 8.7gr.

Fe211 ・1. :! Coat the λ/4 film three times with gr. The spectral absorption characteristics of each are reproduced as follows.

(b)-2 Chemical composition CaO262.5Hr, Cr203
25. Coat the λ/4 film 6 times with Ogr+Fe203 for 12.5 hours.

The absorption density and reflection color are visually consistent. Using 613 and -7 as monitor glasses, the reflectance in vacuum is -32.
, 7% to 34.2%.

(b)-3 Chemical composition Cc02 90.1Hr, Cr2
03 6.8 hours.

Coat the λ/4 film 5 times with Fe203 for 3.2 hours.

The reflectance in vacuum using BK-7 as a monitor glass is:
It was reproduced in the range of 24.9% to 26.0%.

As shown in the above examples (experiments), safety in repeated use does not depend on the amount of colorant, but shows that the composition of the sublimation chemical is maintained.

(c) Spectral reflection characteristics of multilayer film Aiming for a brown color transmittance of 97.5% for glasses.

Chemical composition CeO2B9.9Hr, Cr20 core, 4H
r, Fe2032.7Hr was used. Its optical constant is a refractive index of 2.37. The absorption coefficient is 0.064, and it is applied to a high refractive index layer of a multilayer film structure. During the deposition,
The temperature was 280°C.

The film structure of the colored antireflection film is shown below.

Membrane configuration air side n=1. Ov thickness nm L 143.10 H79,23 L 30 , 49 (95,81 L 49.65 H33,86 L 27.83 Glass side n = 1.60 1, : MgF2 n = 1.38
H:CL! 02 89.9Hr n =2.3
7. k = 0.0fli4Cr20 7.4Hr Fe203 2.7Hr Here, the symbol H indicates a low refractive index material, and the symbol H indicates a high refractive index material. Further, n is a refractive index, and k is an absorption coefficient. The film thickness is expressed as an optical film thickness.

The reproducibility results of the spectral reflection characteristic R1 and the spectral transmission characteristic T obtained by actual vapor deposition are shown in FIG. In FIG. 1, the horizontal axis is the wavelength, and the vertical axis is the transmittance 9 reflectance, and the full scale of the transmittance is 100%.

The full scale of reflectance is expressed as 5%.

Regarding coloring, according to color meter measurements, the results of 14 reproduction experiments were ΔL": 97.4~97.8°a
"; 0.07~Q, 41.b"; 5.0
8-5.57. ΔE≦0.22, the variation was small, and no difference in density or color tone was visually perceived.

The following can be explained from these examples (experimental results).

First, the existence of absorption in a single-layer film or a multi-layer film means that the coloring agent in the coating chemical is also contained in the coating film. j
The possibility of repeated use of the chemical as seen in the reproduction of the spectral absorption characteristics and vacuum reflectance in the film experiment showed that the component ratio was maintained between the chemical and the smoked film.

Furthermore, the stability of the nine color tones in the multilayer film experiment.

Reproduction of spectral transmission and reflection properties indicates ffi productivity,
making them certain.

g. Effects The colored anti-reflective film prepared using the mixed chemicals of the present invention has excellent durability and has passed boiling tests and strength tests. In addition, by experimentally determining the mixing ratio of the colorants Cr2O3 and Fe201 to the main material, it is possible to freely select the coloring concentration, and also to
Another feature of this chemical is that it is possible to freely select the color tone with respect to the mixing ratio of O, for example, if Fe201 is increased, the color tone will be reddish, and if Fe201 is decreased, the color tone will be yellowish.

Furthermore, the property of maintaining the composition of the sublimable mixed drug obtained in this way is not limited to the absorbent drug introduced in the example, but it is also a mixture of a high refractive index material and a low refractive index material, which has an intermediate refractive index. It can also be applied to transparent coating chemicals, thereby reducing the number of layers and improving spectral transmission and anti-reflection! Tubes with improved LT characteristics also have great advantages in terms of production.

76 simple drawings! 11. Explanation 1: ?I is a characteristic diagram showing the spectral reflection characteristic R and the spectral transmission characteristic T obtained by the embodiment of the present invention.

Claims (1)

[Claims] 1. A coating film for optical products characterized by using a mixed chemical having sublimation properties for vapor deposition. 2. In claim 1, the mixed chemical is CeO
A coating film for optical products characterized by comprising _2, Cr_2O_3, and Fe_2O_3. 3. In claim 2, when the mixing ratio of the mixed chemicals is 100g of CeO_2 by weight, Cr_2O
A coating film for optical products, characterized in that _3 is 20 gr or less and Fe_2O_3 is 10 gr or less.