JPS62820A - Fluorescent object color measuring instrument - Google Patents

Abstract

PURPOSE:To easily measure a fluorescent object color under synthetic daylight by forming a fluorescent lamp to a toric shape so that the optical axis connecting a sample to be measured and a colorimeter or the sample and spectrophotometer coincides with the central point of the circle of the fluorescent lamp. CONSTITUTION:This instrument is constituted of the fluorescent lamp 1 and the object color measuring instrument such as a tristimuls value direct reading type colorimeter or spectrophotometer 2, etc. The lamp 1 is the fluorescent lamp of which the spectral characteristics are approximate to the spectral characteristics of standard light D65 and the performance thereof is classified as BB class by the Japanese Industrial Standards. The shape thereof is toric. The optical axis 8 of the object color measuring instrument intersects orthogonally with the face 3a of the sample 3 on the lamp 1 side and the lamp 1. The optical axis 8 and the central point 1a of the circle of the lamp 1 coincide with each other and the radius 1b of the lamp 1 and the distance from the point 1a to the sample surface 3a are equal. More specifically, irradiation light 9 from the lamp 1 is made incident on the sample surface 3a at about 45 deg. angle and only the reflected light of the 0 deg. direction with respect to the normal 8 of the sample surface 3a is taken in via a diaphragm 5 disposed around the optical axis 8 into the object color measuring instrument.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fluorescent object color measuring device, and more specifically, 1.
Standard light IIIg specified in Japanese Industrial Standards (JIS Z 8720), auxiliary standard light H, H, H, or D
1. The present invention relates to an apparatus for numerically measuring the color of a sample containing a fluorescent dye or pigment under synthetic daylight, that is, the color of a fluorescent object.

[Technical background of the invention and its problems]

The object color (hereinafter referred to as fluorescent object color) of a sample containing a fluorescent dye or fluorescent pigment (hereinafter referred to as fluorescent sample) is significantly different from the object color of a non-fluorescent sample due to its spectral radiance rate ( Since the apparent spectral reflectance of a sample relative to a commonly used standard white surface differs depending on the illumination light, the color of an object under any illumination light is generally calculated from only the spectral radiance measured using a single illumination light. The point is that it is not possible.

For this reason, various measurement methods and estimation methods regarding fluorescent object colors have been proposed. And these methods mainly concern fluorescent object colors under standard light. This is because object color has a spectral shape such as spectral reflectance and spectral irradiance in the visible wavelength range that the human visual system responds to.
In addition, the shape of the excitation spectrum from the ultraviolet wavelength range to the visible wavelength region is important for fluorescent object colors, such as fluorescent whitening agents, and currently the Japanese Industrial Standards (JI8Z)
8720) and the International Commission on Illumination (Publication
Among the standard lights for colorimetry specified by CIE No. 51), those that have sufficient spectral radiant energy from the visible wavelength range to the ultraviolet wavelength range are standard lights D6. This is because only - Conventional methods for measuring fluorescent object colors include the two-spectrometer method, which measures the fluorescent object color under arbitrary illumination light using two spectrometers, one for monochromatic light excitation and one for spectroscopic observation, and the two-spectrometer method, which measures the fluorescent object color under arbitrary illumination light. Standard light I4. is calculated from the spectral radiance coefficients obtained under the 2#M class illumination and light reception conditions of monochromatic light illumination - non-spectral observation and white light illumination - spectroscopic observation using the standard light I4. It can be roughly divided into two types: 1 spectrometer method that measures and estimates the fluorescent object color below.

However, the measurement procedures for both methods are extremely complicated compared to measuring the object color of a normal non-fluorescent sample.
Additionally, there was a problem in that conventional object color measuring devices such as tristimulus direct reading colorimeters and spectrophotometers were not always capable of measuring fluorescent object colors using the device's original usage method. OBJECT OF THE INVENTION The object of the present invention is to solve such conventional problems and to provide a standard light D■ for colorimetry and an auxiliary standard light Huff. An object of the present invention is to provide a fluorescent object color measuring device that can easily measure the fluorescent object color under synthetic daylight such as , D, or □.

[Summary of the invention]

As a result of extensive research in order to achieve the above objective, the present inventors have determined that the light of the standard or the light of the auxiliary standard is based on the evaluation method described in the appendix of the Japanese Industrial Standard (JIS Z8720). The fluorescent object color measured directly using a fluorescent lamp that is recognized to be similar to the fluorescent object color in the light of the standard or photons of the auxiliary standard measured and estimated using the conventional fluorescent object color measurement method. The present invention was completed after confirming the fact that they are extremely similar. In other words, the fluorescent object color measuring device of the present invention has spectral characteristics that are based on the standard light or auxiliary standard light specified in the Japanese Industrial Standards (JIS Z 8720) and the evaluation method described in the appendix of the standard. It is characterized by consisting of a fluorescent lamp that is recognized to be similar based on the above, and a tristimulus value direct reading colorimeter or spectrophotometer.

Furthermore, the measurement of such fluorescent object color is based on the Japanese Industrial Standards (JI).
S Z 8722) Measurements are made under conditions a or bl, that is, the geometric conditions of illumination and light reception of 0'/45° or 45°10°.

For this reason, regarding the fluorescent lamp and tristimulus direct reading type colorimeter or spectrophotometer that constitute the fluorescent object color measuring device of the present invention, the shape of the fluorescent lamp is annular, and the sample to be measured and the colorimeter or the sample are connected. The optical axis connecting the spectrophotometer and the center point of the fluorescent lamp are aligned, and the illumination light irradiated from the fluorescent lamp to the sample and the sample enter the colorimeter or from the sample to the spectrophotometer. The geometric relationship of the optical axes, that is, the geometric conditions for illumination and light reception, was set to approximately 45° and 70°.

The composition of the fluorescent component of the fluorescent lamp constituting the fluorescent object color measuring device of the present invention is not limited in any way, and any fluorescent lamp that satisfies the above-mentioned requirements regarding spectral characteristics and shape may be used as appropriate. .

[Embodiments of the invention]

The present invention will be explained in detail below with reference to the drawings. 1st
The figure is a partially cutaway diagram showing an embodiment of the fluorescent object color measuring device according to the present invention. In Figure 1, drawing number 1 is a fluorescent lamp, 2 is an object color measuring device such as a tristimulus direct reading colorimeter or spectrophotometer, 3 is a sample to be measured, 4 is a fluorescent lamp support, and 5 is a fluorescent lamp support. Each represents a diaphragm, and the above parts 1 to 5 are attached to the cover 6,
This constitutes a fluorescent object color measuring device. Note that the illustration of the lighting power source for the fluorescent lamp 1 and the fixing jig for the sample 3 is omitted.

Here, the fluorescent lamp 1 is a fluorescent lamp whose spectral characteristics are similar to those of the standard optical DSS, which was manufactured based on the special song No. 1748/1983, and its performance (degree of goodness of approximation) is based on the Japanese Industrial Standards (JIS Z Standard light L4.8720), which is classified as BB class according to the attached evaluation method, including the visible and ultraviolet wavelength ranges. ◇However, its shape is annular, that is, a donut-like shape with a hole, in order to meet the purpose of the present invention.

In FIG. 2, the spectral distribution of standard light C is shown by a solid line, and the spectral distribution of the fluorescent lamp 1 is shown by a dotted line.

In addition, the cover 6 has a window 6a for irradiating the sample 3 with light from the fluorescent lamp l, and a window 6b for guiding the reflected light from the sample 3 to the object color measuring device 2, facing each other. . Further, the inner surface of the cover 6, the surface of the screen light lamp support 4, and the diaphragm 5 are treated with black matte to suppress stray light inside the cover 6 as much as possible.

Next, the geometric arrangement of each component will be explained based on FIG. The optical axis 8 (of light incidence) of the object color measuring device 2 is connected to the surface 3a of the sample 3 on the fluorescent lamp 1 side and the fluorescent lamp 1.
is orthogonal to Furthermore, the optical axis 8 and the circular center point 1a of the fluorescent lamp 1 coincide, and the radius 1b of the fluorescent lamp 1 and the distance from the circular center point 1a to the sample surface 3a are equal. In other words, the irradiation light 9 from the fluorescent lamp l is
is incident at an angle of approximately 45' to the sample surface 3, and only the reflected light in the O0 direction with respect to the normal 8 to the sample surface 3, a is taken into the object color measuring device 2 via the diaphragm 5 disposed around the optical axis 8. It will be done. This corresponds to the relationship of 45°/o O among the geometrical conditions for illumination and light reception stipulated in the Japanese Industrial Standards (JIS Z8722). The results of the measurements conducted will be described below.

The most accurate method for measuring fluorescent object color is to directly measure the total spectral radiance rate or tristimulus values of a fluorescent sample under the desired illumination light (direct measurement method). Standard light for D6. Since is an illumination light for which only the value of its spectral distribution is defined, such a direct measurement method cannot be applied to the standard light I)as. For this reason, we will use the Bilmeyer method (F-
W-Bill 1meyer, Jr-, et, pi
, :Co1or Research and Appl
cation Vol, 5. No, 3. pp
, 156-168 (1980)). Let us consider the fluorescent object color at the bottom as the true value.

Figures 4 to 7 show four types of fluorescent samples 3 shown below.
Regarding the object color measuring device f shown in FIGS. 1 and 3,
The total spectral radiance ratio measured using a spectrophotometer for Ili2 is shown.

In Figures 4 to 7, the dotted lines indicate values measured using this fluorescent object color measuring device @7, and the solid lines indicate values measured using the Bil1meye
Standard light D6 by r method. It represents the estimated value below.

[Fluorescent sample 3 used for measurement] (1) Yellow-red luminescent color fluorescent coated paper (Figure 4) (2)
Yellow fluorescent color fluorescent coated paper (Figure 5) (3) Green fluorescent color fluorescent coated paper (Figure 6) (4) Fluorescent brightener coated paper (Figure 7) This total spectral radiance factor and Figure 2 Using the values of the spectral distribution of each illumination light shown, the Japanese Industrial Standard (JISZ8729)
The following table shows the calculation results of the object color obtained for the I, ab color system defined in .

Note that the calculation was performed using a 10' visual field color matching function.

Table Calculation results of object color in Lab color system In general, when comparing measurements between different measurers and measuring devices for a sample with a relatively large amount of fluorescent components like the one used in this measurement, it is found that the Lab color system or It is not uncommon for object colors in the L uv color system to differ by about 5 degrees due to color difference. Therefore, from the above table, it can be said that the values measured using the fluorescent object color measuring device according to the present invention are in good agreement with the fluorescent object color under the standard light D65 estimated using the Bil1meyer method, and the actual values are in good agreement. Standard light Dam (s quasi-light D
6. It can be inferred that the value is quite close to the fluorescent object color under illumination light with completely equal spectral distribution).

Although the embodiments of the fluorescent object color measuring device using a spectrophotometer have been described above, the present invention can be applied even if a tristimulus value direct reading colorimeter is used as the object color measuring device 2 shown in FIGS. 1 and 3. It is possible to realize a fluorescent object color measuring device according to the present invention. In this case, instead of the total spectral radiance factor, the tristimulus values Xn, Yn, Zn measured on a commonly used standard white surface at the position of sample 3 and the tristimulus values X, Y, Z measured for fluorescent sample 3 are used. , the fluorescent object color can be determined in the same way, the value of the spectral distribution of the fluorescent lamp 1 may be unknown, and there is an advantage that integral calculations are not required when determining the fluorescent object color.

Furthermore, by using a fluorescent lamp l that approximates the light of another auxiliary standard, it is possible to measure the fluorescent object color under the light of that auxiliary standard.

When performing the above measurements in a dark room, the cover 6 shown in FIG. 1 is not necessary, and the fluorescent lamp 11 object color measuring device 2
Also, an appropriate frame that maintains the geometrical arrangement of the sample 3 may be used.

〔Effect of the invention〕

As is clear from the above explanation, when measured using the fluorescent object color measuring device of the present invention, standard light 1) as Sode-suke standard light, or synthetic daylight as 3, etc. The fluorescent object color at the bottom can be determined more easily than before. In addition, conventional measurement methods generally require the use of a xenon white light source, but since the fluorescent object color measuring device of the present invention uses a fluorescent lamp, it has a long life, is safe for the eyes, and is safe from lamp breakage accidents. It has advantages such as low power consumption and easy handling.

Furthermore, this measuring device can similarly measure the object color of non-fluorescent samples as well.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway diagram showing an embodiment of the fluorescent object color measuring device according to the present invention, and Fig. 2 shows the spectral distribution of the standard light I)s and the fluorescent lamp used in the same embodiment. 3 is a layout diagram of parts constituting the same embodiment, and FIGS. 4 and 7 are graphs of total spectral radiance ratio, respectively. 1... Fluorescent lamp, 2... Tristimulus value direct reading colorimeter or spectrophotometer, 3... Sample, E.
Old... Fluorescent object color measuring device. Agent: Patent Attorney Noriyuki Chika (and 1 other person) No. 1
Figure/Text-&(n-*) Figure 2 Figure 3

Claims (1)

[Claims] 1. Spectral characteristics meet Japanese Industrial Standards (JIS Z 8720)
) and a tristimulus direct-reading colorimeter or spectrophotometer that is recognized as approximating the standard light or auxiliary standard light specified in the standard according to the evaluation method described in the annex to that standard. The fluorescent lamp has an annular shape, and the optical axis connecting the sample to be measured and the colorimeter or spectrophotometer is aligned with the center point of the circle of the fluorescent lamp. Fluorescent object color measurement, characterized in that the geometric conditions of the optical axes of the illumination light irradiated onto the sample and the light incident from the sample into the colorimeter or the spectrophotometer are approximately 45°/0°. Device.