JPS60222731A - Colorimetry apparatus for ultraviolet fluorescent body - Google Patents

Abstract

PURPOSE:To perform colorimetry of a sample of an ultraviolet fluorescent body under the same state as the state of human observation under natural light, by utilizing a visible light emitting body, which emits visible light, and light from an ultraviolet-ray emitting body, which emits ultraviolet rays. CONSTITUTION:An ultraviolet-fluorescent-body colorimetry apparatus is composed of an integrating sphere 1, a visible light emitting body 2, an ultraviolet- ray emitting body 3 and a spectral light measuring device 4. A barium sulfate layer 11 is formed on the inner surface of the integrating sphere 1 so as to diffuse the incident light efficiently. A sample S is provided at a specified position. The visible light emitting body 2 is composed of an incandescent lamp and the like and attached to the central part of a light converging concave mirror 21. The ultraviolet-ray emitting body 3 is composed of a small ultraviolet-ray fluorescent lamp, a deuterium discharge tube or the like, which is attached to a specified position, which does not directly face a sample window 12 of said integrating sphere 1 so that the body 3 can be pushed forward and withdrawn.

Description

[Detailed description of the invention] Technical fields> The present invention relates to an ultraviolet fluorescent object colorimeter.

<Prior Art> Conventionally, various colorimetric devices have been provided to detect the color of a sample. A method to detect the color of a sample by color separation and photometry; Although there are methods, an apparatus to which method (2) above is applied is suitable for measuring the color of a fluorescent object.

In principle, a colorimetric device using method (2) above includes a colorimetric light emitter, a light guiding member for irradiating the light from the light emitter onto the sample, and a light guide member for irradiating the light reflected from the sample. It has a derivation member for deriving the light, and a spectrophotometer for spectrophotometrically measuring the derived reflected light.As the light guide member, an integrating sphere, an optical fiber, a lens, etc. are usually used, and as the derivation member, Optical fibers, lenses, etc. are used, and furthermore, a single photometric light emitter is used as the photometric light emitter.

Here, as the photometric light emitter, one that can provide illumination light that is close to natural light at least in the visible wavelength region, such as an incandescent light bulb, is particularly selected.

However, the intensity ratio of visible light and ultraviolet light in currently available light emitters is too different compared to natural light.

For example, tungsten lamps emit ultraviolet light that is too weak compared to visible light, and xenon discharge tubes emit ultraviolet light that is stronger than tungsten lamps, but the intensity ratio of visible light and ultraviolet light varies greatly depending on the individual. , it was unsuitable as a light emitter for colorimetry of ultraviolet fluorescent objects. That is, it has been impossible to obtain irradiation light close to natural light using a single light emitter.

In view of this, it is conceivable to mix the irradiated light from two types of light emitters with a half mirror, but due to the characteristics of the half mirror and due to deterioration over time, the mixing is not done uniformly, making it difficult to obtain uniform irradiation. It had the fatal problem of not having one.

<Purpose> This invention was made in view of the above problems,
By using light from a visible light emitter that mainly emits visible light and light from an ultraviolet light emitter that mainly emits ultraviolet light, we can easily obtain a light source for colorimetry that closely resembles natural light, so that it can be observed by humans under natural light. It is an object of the present invention to provide an ultraviolet fluorescent object colorimeter that can measure the color of an ultraviolet fluorescent object in a sample under the same conditions as described above.

In order to achieve the above object, the ultraviolet fluorescent object colorimeter of the present invention has a configuration in which a sample is irradiated with diffused light diffused by the inner surface of an integrating sphere, and reflected light from the sample is received. In an apparatus that measures the color of a sample by Furthermore, it is characterized by the provision of an adjustment device for adjusting the amount of near ultraviolet radiation emitted into the integrating sphere by the ultraviolet emitter.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 1 is a simplified diagram showing an embodiment of the ultraviolet fluorescent object colorimeter, which includes an integrating sphere (1), a visible light emitter (2), an ultraviolet light emitter (3), and a spectrophotometer (4). ).

More specifically, the integrating sphere (1) has a barium sulfate layer (11) formed on its inner surface in order to efficiently diffuse incident light, and the sample (S) is placed at a predetermined position inside the integrating sphere (1). A visible light introduction window (13) that forms a sample window (12) facing the sample window (12) and introduces the irradiated light from the visible light emitter (2) to a predetermined position not directly facing the sample window (12).
A light-receiving fiber (14) for colorimetry is installed to face the sample window (12) almost directly to efficiently receive reflected light from the sample (S).
A compensation light-receiving fiber (15) is attached to a predetermined position that does not directly face the sample window (12).

The visible light emitter (2) is composed of an incandescent light bulb or the like, and is attached to the center of the concave mirror (21) for condensing light. And a visible light emitter (2) and a visible light introducing window (13)
A spectral distribution adjustment filter (22) is provided between the visible light emitter (2) and the visible light introduction window (13).
) is provided with a mirror (23) that leads to the

The ultraviolet emitter (3) is located in the sample window (
It is composed of a small ultraviolet fluorescent lamp or deuterium discharge tube, etc., which is installed in a predetermined position that does not directly face the The amount of protrusion into the ball (1) can be adjusted.

The spectrophotometer (4) is connected to the receiving fiber (14) (15)
selectively guides the light received by the spectroscopic optical system,
It is possible to obtain the light intensity distribution for each wavelength.

If the ultraviolet fluorescent object colorimeter with the above configuration is used, the integrating sphere (
After setting the sample (S) for color measurement in the sample window (12) of 1), the color measurement of the sample (S) is performed by applying voltage to the visible light emitter (2) and the ultraviolet light emitter (3). can be done.

To explain in more detail, visible light and ultraviolet light are introduced into the integrating sphere (1) and mixed by simply applying voltage to the visible light emitter (2) and the ultraviolet light emitter (3). Therefore, it is unclear whether the spectral distribution closely resembles natural light.

Therefore, first, the spectral distribution of light in the sample window (12) is measured, and the ultraviolet emitter (3) is placed on an integrating sphere ( 1) Slide it against
Alternatively, slide the ultraviolet light emitter (3) so that the colorimetric values such as the spectral reflectance and CIE tristimulus values of an appropriately selected standard fluorescent object such as a dyed material or a plastic plate become the standard value,
Alternatively, the colorimeter itself is configured to be able to measure the spectral distribution of light in the sample window (12) or an uncalibrated relative value, and the ultraviolet light emitter (3) is slid so that this measured value becomes the standard value, Alternatively, the wavelength band of light in the sample window (12) is divided into at least the visible region and the ultraviolet region, and the ultraviolet light emitter (3
), the spectral distribution of light can be made to closely resemble natural light.

As described above, after setting the spectral distribution of light, it is only necessary to set the sample (S) in the sample window (12), and then irradiate the sample (S) with a mixture of visible light and ultraviolet light. The reflected light from (S) is received by the light receiving fiber (14), and the intensity of the reflected light for each wavelength can be detected by the spectrophotometer (4).

That is, it is possible to measure the color of an ultraviolet fluorescent object under natural light under the same conditions as observed by a human.

Figures 2 and 3 are both J l5LO8061"G
Figure 2 shows the colorimetric data when a scale No. 1 is used as the sample (S). Fig. 3 shows the reflectance for each wavelength from the sample (S) when the ultraviolet emitter (2) is not used at all. ing.

As is clear from this figure, when no ultraviolet emitter (3) is used, very few ultraviolet fluorescent objects are observed, but by using the ultraviolet emitter (3), ultraviolet fluorescent objects can be It can be recognized in the same way as human observation under natural light, and color measurement can be performed under natural conditions.

FIG. 4 is a diagram showing the relationship between the ultraviolet light emitter (3) and the integrating sphere (1) in another embodiment, and the ultraviolet light from the ultraviolet light emitter (3) is efficiently transferred into the integrating sphere (1). A concave mirror (33) for irradiation and a light amount adjustment member (34) composed of a diaphragm plate, slit, etc. for adjusting the amount of ultraviolet light irradiated inside the integrating sphere (1) are provided. The ultraviolet light emitter (3), the concave mirror (33), and the light amount adjustment member (34)
are each connected to a drive device composed of a motor and a deceleration structure, etc., and can independently move toward and away from the integrating sphere (1).

Therefore, by simply adjusting the position of any one of the ultraviolet emitter (3), the concave surface Vi (33), or the light intensity adjustment member (34), the amount of ultraviolet light irradiated inside the integrating sphere (1) can be changed, and the sample ( The spectral distribution of the light irradiated to S) can be made to closely resemble natural light.

However, in the case of this example, for example, the ultraviolet light emitter (3)
In addition to being able to move the concave mirror (33) and the concave mirror (33) in one direction, the ultraviolet light irradiation aperture of the integrating sphere (1) can also be used as a light amount adjusting member (34).

FIG. 5 is a diagram showing the relationship between the ultraviolet light emitting body (3) and the integrating sphere (1) showing still another embodiment, and the difference from the embodiment in FIG. The only difference is that a lens (35) is used, and the ultraviolet light irradiation aperture of the integrating sphere (1) also serves as a light amount adjustment member (34).

Therefore, in this example as well, the ultraviolet light emitter (3)
Alternatively, by adjusting the position of at least one of the lenses (35), the spectral distribution of the light irradiated onto the sample (S) can be made to closely resemble natural light, similarly to the above embodiment.

Note that the present invention is not limited to the above embodiments, and for example, it is possible to manually move the ultraviolet light emitter (3), the concave mirror (33), the light amount adjustment member (34), and the lens (35), and to adjust the amount of light. It is possible to use an iris diaphragm, a variable width slit, etc. as the adjustment member (34), and further to adjust the spectral distribution using a filter, and various other design changes may be made within the scope of the invention. be able to.

Effect> As described above, this invention uniformly mixes visible light and ultraviolet light by irradiating them into an integrating sphere, and also changes the spectral distribution of the light irradiating the sample by changing the amount of ultraviolet light. Since it closely resembles natural light, it is possible to measure the color of ultraviolet fluorescent objects under the same conditions as observed by humans under natural light, and it is also possible to arbitrarily adjust the spectral distribution of the light irradiating the sample. By setting this value, it is possible to carry out colorimetry of ultraviolet fluorescent objects under various conditions.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing an ultraviolet fluorescent object colorimeter, Figures 2 and 3 are diagrams showing colorimetric data of an ultraviolet fluorescent object, and Figures 4 and 5 are an ultraviolet emitter and an integrating sphere. FIG. 2 is a schematic diagram showing another example of the relationship between (1)... Integrating sphere, (a... Visible light emitter, (3)...
...Ultraviolet emitter, (S)...sample. Patent applicant: Sumitomo Chemical Industries, Ltd. Patent applicant: Union Giken Co., Ltd. Figure 1

Claims (1)

[Claims] 1. In an apparatus that measures the color of a sample by irradiating the sample with diffused light diffused by the inner surface of an integrating sphere and receiving reflected light from the sample, the irradiated light in the visible wavelength range is used. A visible light emitter that emits light inside the integrating sphere is provided, an ultraviolet light emitter that emits at least near ultraviolet rays is provided inside the integrating sphere, and an adjustment device that adjusts the amount of near ultraviolet light emitted by the ultraviolet light emitter into the inside of the integrating sphere. An ultraviolet fluorescent object colorimeter comprising: 2. The ultraviolet fluorescent object colorimeter according to claim 1, wherein the ultraviolet light source is a light emitter that is directly introduced into the integrating sphere. 3. The ultraviolet fluorescent object colorimeter according to claim 2, wherein the adjustment device moves the ultraviolet light source forward and backward with respect to the integrating sphere. 4. The ultraviolet fluorescent object colorimeter according to claim 1, wherein the ultraviolet light source comprises a light emitting body provided apart from the integrating sphere, a light condensing body, and a transmitted light amount adjusting body. 5. The ultraviolet fluorescent object colorimeter according to claim 4, wherein the adjustment device moves at least one of a light emitting body, a condenser, and a transmitted light amount adjusting body forward and backward with respect to an integrating sphere. 6. The ultraviolet fluorescent object colorimeter according to claim 4, wherein the adjustment device moves the light emitting body and the light condensing body integrally forward and backward with respect to the integrating sphere. 7. The scope of the above claims in which the condenser is a concave mirror! ¥4
The ultraviolet fluorescent object colorimeter described in Section 1. 8. Claim 4 above, in which the condenser is a convex lens
The ultraviolet fluorescent object colorimeter described in Section 1. 9. The ultraviolet fluorescent object colorimeter according to any one of claims 6 to 8, wherein the transmitted light amount adjusting body is also used as an ultraviolet light introducing opening of an integrating sphere. 10. The ultraviolet fluorescent object colorimeter according to claim 4, wherein the transmitted light amount adjusting body is an aperture or a slit. 11. The ultraviolet fluorescent object colorimeter as claimed in claim 2 or 4, wherein the ultraviolet fluorescent object is a deuterium discharge tube.