JPH0372938B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a fluorescent condition color matching pair, and more specifically, in a spectral distribution shape of illumination light that contributes to an object color including a fluorescent object color, a certain illumination light is different from a predetermined illumination light. This invention relates to color matching pairs of fluorescent conditions that can be visually observed and clearly identified to see if they are similar. [Technical background of the invention and its problems] Conventionally, a certain illumination light (hereinafter referred to as "test light") has a spectral distribution shape that is similar to a predetermined illumination light (hereinafter referred to as "reference light"). For example, the Japanese Industrial Standards (JIS Z
8720) and publications of the International Commission on Illumination
The conditional color matching index described in CIE No. 51 (TC-1.3) is used. The light matching index is a calculation method described in the Japanese Industrial Standards (JIS Z 8729) that calculates the color difference that occurs under the test light between a color chart pair that is the same color under the reference light (hereinafter referred to as a "conditional color matching pair"). The smaller the color difference, in other words, the smaller the conditional color matching index of the test light, the better the test light is judged to be similar to the reference light. The problem here is what to use for the conditional color matching pair. In order to obtain the conditional color matching index, the values of three variables must be known: the spectral characteristics of each conditional color matching pair, the color matching function, and the spectral distribution of the test light. The values for the standard observer described in (JIS Z 8701) are known, and the spectral distribution of the test light uses measured values, so there is no problem with at least two variables. However, although the spectral reflectances of conditional isochromatic pairs can be computationally combined infinitely, the greater the number of conditional isochromatic pairs, the greater the computational effort required for their synthesis and color difference calculations, and in reality This is not practical because there is a possibility that even objects that are not present may be included in the condition color matching pair. On the other hand, actual methods for evaluating the degree of approximation include a method of calculating the conditional color matching index, and a method of evaluating by visual observation of a conditional color matching pair. However, the former method is extremely complicated because it requires measurement of the spectral distribution of the test light. For the above reasons, it is preferable to apply a simple visual observation method to the approximation evaluation. It is desirable that the conditional color matching pairs used in this method be those that can actually be created, and that the number of such pairs is within several types. To give an example, the aforementioned Japanese Industrial Standards (JIS Z
8720) has five sets of conditional isochromatic pairs for evaluating the degree of approximation of spectral distribution in the visible range, and three sets of conditional isochromic pairs for evaluation including the spectral distribution in the ultraviolet range. is stipulated. However, conventional conditional color matching pairs, including these conditional color matching pairs, are generally conditional color matching pairs of non-fluorescent color chips, or conditional color matching pairs that are a combination of non-fluorescent color chips and non-fluorescent color chips. Due to limitations on usable color pairs, it has been difficult to make the spectral reflectances of the paired color chips significantly different from each other. Such a problem is particularly noticeable in a conditional color matching pair formed by a combination of non-fluorescent color chips. Therefore, when evaluating the similarity of illumination light by visual observation using these color matching pairs, if the illumination light is slightly different from the reference light, the color difference will be large enough to be clearly discernible visually. Since this method does not occur, there was a problem that the sensitivity for approximation evaluation was insufficient. [Object of the Invention] The present invention solves such conventional problems and clearly and clearly determines whether illumination light such as an artificial light source or natural daylight is similar to predetermined illumination light by visual observation. The purpose is to provide color matching pairs of fluorescent conditions that can be easily identified. [Summary of the Invention] As a result of extensive research to achieve the above object, the present inventors have discovered that at least two color patches constituting a conditional isochromatic pair are made of fluorescent materials having different spectral characteristics. If the colors are adjusted, under illumination light that is not similar in spectral distribution shape to the reference light, the difference in appearance of the two color patches will become conspicuous and clear due to the difference in the spectral characteristics of these two fluorescent materials. The present invention was completed after confirming the fact that by using such conditional color matching pairs, it is possible to accurately evaluate the degree of approximation of illumination light that contributes to object colors, including fluorescent colors, by visual observation. . That is, the fluorescent condition color matching pair of the present invention includes at least two fluorescent color patches each of which is colored with a fluorescent material that emits light in a different wavelength range within the visible wavelength range, and the at least two fluorescent The gender color chart is characterized in that under a predetermined illumination light (reference light), the colors are the same in the results of calculation or visual observation. As described above, the at least two color chips constituting the fluorescence condition color matching pair of the present invention are toned to be the same color under the reference light, and in different wavelength regions within the visible wavelength range. It is necessary to contain each fluorescent material having its emission spectrum. On the other hand, the excitation wavelength ranges of these two fluorescent materials are not particularly limited; for example, as long as they are both excited in the visible wavelength range,
Fluorescent condition color matching pairs that are excellent for evaluating the degree of approximation in the visible part of illumination light can be obtained. On the other hand, if one of the fluorescent materials is excited in the ultraviolet wavelength region, it is possible to obtain a pair of fluorescent condition isochromatics that can be evaluated for the degree of approximation including the ultraviolet wavelength range. Further, the fluorescent materials respectively contained in the at least two fluorescent color chips shift in hue and saturation in opposite directions under illumination light having a spectral distribution shape different from that of the reference light. It is preferable that it is selected as follows. Specifically, first, in the visible wavelength range, which is generally 400 to 700 nm, it is advantageous that the peak positions of the emission spectra of the two fluorescent materials are as far apart as possible in terms of color, or that they are complementary colors to each other. For example, it is preferable that one of them has a peak in the blue region of visible short wavelengths, and the other has a peak in the yellow-red region of visible long wavelengths. Further, the fluorescence condition color matching pair of the present invention may include the above-mentioned at least two fluorescent color chips and a non-fluorescent color chip prepared separately from them. At this time, under the reference light, the color of the non-fluorescent color patch is adjusted so that the color is the same as each of the fluorescent color patches based on calculation results or visual observation results. Further, in the present invention, the reference light is not particularly limited, but is preferably, for example, standard light or auxiliary standard light specified in Japanese Industrial Standards (JIS Z 8720). There are no limitations on the actual shape or combination of the color patches constituting the color matching pair of fluorescent conditions of the present invention. They may be used in appropriate combinations made into plate shapes. At this time, each color chart may be prepared separately one by one, or may be pasted on a mount. Furthermore, the mount may also form conditional matching colors with the color chart group. [Embodiments of the Invention] The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a fluorescent condition color matching pair according to the present invention. In Figure 1, drawing number 1 represents a non-fluorescent color patch, 2a and 2b each represent a fluorescent color chart, and each color chart 1, 2a and 2b is a standard light D ₆₅ specified by JIS Z 8720.
The dyes in each color table are blended so that the colors are almost the same under the following conditions, and constitute the fluorescent condition color matching pair 3. [Dye used in non-fluorescent color chart 1] Titanium white (rutile type) Titanium yellow pigment Cobalt blue pigment Soluble azo red pigment [Dye used in fluorescent color chart 2a] Titanium white (rutile type) Titanium yellow pigment Cobalt Blue pigment Soluble azo red pigment Fluorescent whitening agent [Dye used in fluorescent color chart 2b] Titanium white (anatase type) Disazo yellow pigment Copper phthalocyanine blue pigment Basic dye fluorescent red pigment Each color chart contains each of the above pigments. The mixture is mixed and kneaded into plastic to form a plate, and each fluorescent color patch 2a and b is placed on top of the non-fluorescent color patch 1. Further, the spectral reflectance of each color patch is as shown in FIG. 2, the relative excitation spectrum of the fluorescent color patch is as shown in FIG. 3, and the relative emission spectrum is as shown in FIG. 4. In FIGS. 2 to 4, solid lines indicate values for non-fluorescent color patch 1, dashed lines for fluorescent color patch 2a, and dotted lines for fluorescent color patch 2b, respectively. In the above configuration, the conditional color matching pair formed by the combination of the non-fluorescent color chart 1 and the fluorescent color chart 2a is the visible part of the conventionally commonly used light source as shown in, for example, the Japanese Industrial Standards (JIS Z 8720). and has almost the same properties as the isochromatic pair of conditions for evaluating the degree of ultraviolet approximation. Therefore, the color chart pair 1 and 2a will be described below as a conventional example, and the color chart pair 2a and 2b will be described as an example. Note that the remaining color patch pair 1 and 2b will be excluded from the following description, but they can be used mainly for evaluating the degree of approximation of the visible part of illumination light. Using each color chart pair of the above conventional example and example, the color difference occurring in each color chart pair under each test light was calculated, and the results are shown in the table. In the table, each color difference is expressed in CIELAB units using a 10° visual field standard observer.

[Table] As is clear from the table, the color difference with respect to the standard light D ₆₅ is almost the same as 0.2 in both the conventional example and the example, but the auxiliary standard light D has a slightly different spectral distribution from the standard light D ₆₅ . ₅₅ , D ₇₅ and JIS xenon standard white light source: 0.6 vs. 1.2, 0.2 vs. 0.6, 0.4 vs. 1.0, respectively.
Therefore, it can be seen that the color difference is approximately 2 to 3 times larger when the fluorescent condition matching pair of the example is used than in the conventional example. Generally, the pigment between two adjacent objects is approximately
When the value is greater than 0.5, the difference is considered to be clearly perceived by the human eye. In other words, in the results shown in the above table, under the conventional fluorescent condition isochromatic pair, the difference between the standard light D ₆₅ , the auxiliary standard light D ₇₅ , and the JIS xenon standard white light source cannot be visually discerned. On the other hand, with the color matching pair of fluorescence conditions of the present invention, these lights can be clearly identified visually. As shown in Fig. 5, for example, when the illumination light changes from the standard light D ₆₅ to the auxiliary standard light D ₅₅ , the difference in the luminescent color of the fluorescent materials contained in each fluorescent color chart 2a and 2b is caused. (Figure 4), a ₁₀ ^* b ₁₀ ^*
On the coordinates, the coordinate point 〇 mark of the fluorescent color chart 2a and the coordinate point + mark of the fluorescent color chart 2b are shifted in almost opposite directions,
This is because the color difference due to the non-approximation to the spectral distribution of standard light _D65 is emphasized. Also, by using color chart 1, if a certain illumination light is similar to standard light D ₆₅ only in the visible part, color chart pairs 1 and 2b will be almost the same color, and other color chart pairs 2a
and 2b, 1 and 2a are no longer the same color, and if the visible and ultraviolet regions are similar, the color chart pair 1 and 2
It is also possible to determine which wavelength ranges the test light is similar to the reference light and which wavelength ranges are not similar, such as saying that a and 2b are all the same color. Above, we have explained the three-color chart for approximation evaluation including the ultraviolet region, and the fluorescence condition isochromic pair using the three-color chart pair, but the isochromic pair of the present invention is not limited to this structure, and for example, the above-mentioned so that at least 1
If each fluorescence color patch in the fluorescent condition isochromatic pair is composed of those that are mainly excited in the visible region and emit mainly in the visible region, fluorescence condition isochromatic is excellent for evaluating the visible region approximation of illumination light. A pair is obtained. Moreover, each color patch can also be formed by coating a substrate with a predetermined pigment in the form of paint or printing ink. It goes without saying that the composition of the dye can be changed depending on the required conditions. In addition, the reference light is not limited to the standard light _D65 , but may also include, for example, the standard light A or C, the auxiliary standard light
D ₆₅ , D ₅₅ , or D ₇₅ and other illumination lights may be classified according to their uses. Furthermore, when such color matching pairs of fluorescence conditions, each of which has a different type of target reference light, are placed together, the illumination light is determined to be the most suitable depending on which color chart pair the illumination light appears to be the smallest in. It is also possible to evaluate which reference light is similar. The above fluorescent condition matching color pairs, that is, color chart groups, may be fixedly arranged by adhering to a mount etc., but
By dividing each color ticket into thank you notes and having them keep it,
It is also possible to price the test light according to a predetermined combination of color charts depending on the purpose, such as with which reference light the test light is to be compared. In that case, unlike fixed arrangement, there is no need to line up multiple sheets on the same mount, so you can increase the size of one color sheet without taking up space, and you can replace only the deteriorated color sheet. It is also convenient in terms of maintenance. [Effects of the Invention] As is clear from the above explanation, when the similarity of illumination light is evaluated by visual observation using the fluorescent condition color matching pair of the present invention, it is found that a certain illumination light and reference light are similar. In some cases, the fluorescent color matching pair appears to be almost the same color, but if they are not similar, especially in a color chart pair consisting of fluorescent color chips, the spectral characteristics of the fluorescent material contained in each color chart may be affected. It is clearly discernible that the colors are not matched due to the difference. From this,
It was confirmed that the degree of approximation between a certain illumination light and the reference light can be easily and clearly evaluated visually.
Furthermore, by using a plurality of color chart pairs of the present invention, the possibility of misidentification of similarity evaluation that may occur when only one color chart pair is used can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a fluorescent condition color matching pair according to the present invention, and FIGS. 2 to 4 respectively show the spectral reflectance, relative excitation spectrum, and A graph of the relative emission spectrum, FIG. 5 shows a ₁₀ ^* b ₁₀ ^* under the standard light D ₆₅ and the auxiliary standard light D ₅₅ of the fluorescent color chart constituting the example.
It is a graph showing coordinates. 1...Non-fluorescent color chart, 2a, 2b...Fluorescent color chart, 3...Fluorescent condition matching color pair.

Claims (1)

[Scope of Claims] 1. At least two fluorescent color patches each containing a fluorescent material that emits light in different wavelength ranges within the visible wavelength range, and the at least two fluorescent color patches are illuminated by a predetermined illumination light. A fluorescent condition color matching pair characterized by color matching in calculation results or visual observation results under (reference light). 2. The invention further comprises at least one non-fluorescent color patch that is color-matching to the at least two fluorescent color patches under the reference light in calculation results or visual observation results. Fluorescence conditions of isochromatic pairs. 3. The fluorescent condition matching pair according to claim 1, wherein the fluorescent materials included in the at least two fluorescent color chips have emission colors that are complementary to each other. 4 The reference light complies with Japanese Industrial Standards (JIS Z 8720)
The fluorescent condition color matching pair according to any one of claims 1 to 3, which is standard light or auxiliary standard light defined in .