JPH08159878A - Illuminating and light receiving apparatus - Google Patents

Abstract

PURPOSE: To provide an illuminating and light receiving apparatus with an extremely simple structure. CONSTITUTION: The illuminating and light receiving apparatus has a structure in which a large number of optical fibers are boundled and at least one of these optical fibers is utilized as a light receiving fiber 1 and other optical fibers are utilized as illuminating fibers 2 and light is radiated to a sample measuring part 6 from the end faces 4 of the illuminating fibers 2 and the reflected light is received by the end face 4 of the light receiving fiber 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination / light receiving optical system, and more particularly to improvement of a spectrocolorimeter for measuring the color of a sample.

[0002]

2. Description of the Related Art In general, metallic coatings found on feathers of birds and insects, and industrial products are subtly changed in color depending on the relationship between light rays and the viewing angle. The cause of such a color change caused by the difference in the observation conditions is mostly due to the problem of gloss that changes depending on the smoothness of the surface, the material, and the texture caused by the surface structure.

In order to discuss such a relationship between the surface color and the surface shape, the reflection component of light from the surface must be considered. This reflection component is roughly classified into (A) specular reflection component (specular reflection and in principle the same color as the illumination light), and (B) skin diffuse reflection component (locally specular reflection, but diffuse reflection due to rough surface). However, the reflection color is the same color as the illumination light, (C) the diffuse reflection component in the colored layer (the color that is diffusely reflected in the color material layer, and the reflected color is the color of the coloring material), (D) the transmission recurrence in the colored layer. It is classified into four types of reflection components (colors of the coloring material that passes through the coloring material layer and are reflected on the surface of the coloring material).

Here, in FIG. 12, (a) shows the case of illuminating the sample surface M which is a high gloss coated surface, and (b) shows the case of illuminating the sample surface which is a medium to low gloss coated surface M '. It is shown that the color component C is different due to the difference in gloss surface.
And the reflection direction of the gloss component L is different, and the reflection characteristics of the color component C are slightly distorted on the medium-low gloss coated surface, and at the same time, the diffuse reflection of the skin is reflected in a wide angle direction unlike the case of regular reflection. Come on.

[0005]

Under these conditions, an extremely complicated process is required to accurately determine the color of the painted surface, etc., and an apparatus capable of simultaneously converting each geometric condition into data. As an example, there is a spectrocolorimeter equipped with an integrating sphere. This is a direction in which the light from the light source is diffused and reflected by the inner wall surface of the integrating sphere to uniformly illuminate the measurement sample surface, and forms an angle of, for example, 8 ° with the axis perpendicular to the sample surface among the light reflected by the measurement sample surface. Is a structure for taking out the light of (3) as data from the light receiving optical system.

However, although this device is capable of highly accurate color measurement, it is complicated and expensive, and color measurement often does not require this level of color measurement accuracy.

A first object of the present invention is to provide an illumination / light receiving device having an extremely simple structure.

Another object of the present invention is to provide an illumination / light receiving device having a simple structure and capable of obtaining light receiving data under geometric multi-conditions.

[0009]

The illumination / light receiving device of the present invention comprises:
It has a structure in which a large number of optical fibers are bundled, and at least one of these optical fibers is used as a light receiving fiber, and the other optical fibers are used as illumination optical fibers.
The sample measuring portion is irradiated with light from the end face of the illumination optical fiber, and the light reflected from the end face of the light receiving fiber can be received.

In the illumination / light receiving device of the present invention, it is preferable that a large number of illumination optical fibers surround the light receiving fiber in the substantially central portion. It should be noted that this surrounding includes a sandwiched form and may be linearly arranged in one row or in multiple rows.

In the illuminating / receiving device of the present invention, at least the end face of the illuminating optical fiber is an inclined surface, and the refraction of light by this inclined surface can be used to focus light at a predetermined position on the sample surface. Is preferred.

In the illumination / light receiving device of the present invention, it is preferable that at least an end face of the illumination optical fiber is provided with a condenser lens so that the lens can condense light at a predetermined position on the sample surface.

In the illumination / light receiving device of the present invention, the inclined surfaces which are the end surfaces of the illumination optical fiber have different inclination angles,
It is preferable that geometrically multi-condition light reception data can be obtained by irradiating the sample measurement unit with light having different irradiation angles.

In the illumination / light receiving device of the present invention, it is preferable that a large number of light receiving fibers surround the illumination optical fiber at the substantially central portion. It should be noted that this surrounding includes a sandwiched form and may be linearly arranged in one row or in multiple rows.

In the illumination / light receiving device of the present invention, at least the end surface of the light receiving fiber is an inclined surface, and the light reflected by the sample surface can be received by the light receiving fiber by utilizing the refraction of the light by this inclined surface. Is preferred.

In the illumination / light receiving device of the present invention, it is preferable that a lens is installed at least on the end face of the light receiving fiber so that the light reflected from the sample surface by the lens can be received by the light receiving fiber.

In the illumination / light receiving device of the present invention, the inclined surfaces which are the end surfaces of the light receiving fiber have different inclination angles,
It is preferable that the light reflected from the sample measuring section and having different reflection angles can be obtained from the end faces of these light receiving fibers as light receiving data of geometrically multi-conditions.

In the illumination / light receiving device of the present invention, the distance between the end surface of the light receiving fiber and the sample measuring section is arranged so as to be different for each light receiving fiber, and the light having different reflection angles reflected from the sample measuring section is provided. It is preferable that the light receiving data can be obtained from the end faces of these light receiving fibers as geometrically multi-condition light receiving data.

In the illumination / light-receiving device of the present invention, the illumination optical fiber and each of the light-receiving fibers are arranged so that the distance between them is different, and light having different reflection angles reflected from the sample measuring portion is emitted from the end faces of these light-receiving fibers. It is preferable that the light-receiving data can be obtained under geometric multi-conditions.

[0020]

[Function] Of the bundle of optical fibers, a predetermined number of fibers are used as the receiving fibers and the other is used as the illuminating optical fibers, and by simply bringing the fiber end face close to the sample surface, both the illumination and the light receiving functions can be achieved at the same time, so the structure is extremely simple. It is possible to obtain a different illumination / light receiving device.

Positions of the light receiving fiber and the illuminating optical fiber,
By using the end face shape, and further, the lens and the like, it is possible to easily obtain the light receiving data under geometric multi-conditions.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. A bundle of optical fibers is formed in FIGS. 1 and 2, and these optical fibers are composed of a light receiving fiber 1 in a central portion and an illuminating optical fiber 2 surrounding the fiber. Furthermore, the circumference of the bundle of these optical fibers is covered by the skirt shield 3.

In particular, in the cross-sectional view shown in FIG. 2, the skirt shield 3 is extended to the sample surface 6 used for color measurement, and shields light from the outside and disturbs the light inside. It is formed to eliminate the influence on the measurement data.

The fiber end face 4 of the illumination optical fiber 2 which is the other optical fiber except the light receiving fiber 1 is
It is an inclined surface with a predetermined angle. This is to allow the irradiation light 5 passing through the illumination optical fiber 2 to be refracted at the end face 4 and to be condensed directly below the light receiving fiber 1. The reflected light 7 that is collected and reflected by the sample measuring portion of the sample surface 6 is introduced into the light receiving fiber 1 above it, photoelectrically converted and amplified through a fiber or a diffraction grating, and received light data (hereinafter referred to as received light data). Will be written)
As a result, it is subjected to computer analysis as received light data and provided for color measurement of the sample.

Another embodiment is shown in FIG. 3, and a lens 8 for condensing light is installed below the fiber end surface 4 of the light receiving fiber 1 and the illuminating optical fiber 2, and the light from the illuminating optical fiber 2 is provided by this lens 8. The light is collected just below the light receiving fiber 1. The lens 8 may be vertically movable or may be vertically movable together with the illumination optical fiber 2 and the light receiving fiber 1. Further, the lens 8 may be a lens eye having a hole in the center.

FIG. 4 shows still another embodiment, which is an improvement of the illumination / light-receiving device having the end surface of the inclined surface shown in FIG. As shown in the figure, this is set such that the inclination angle of the end face 4 of the illumination optical fiber 2 is different based on a predetermined regularity, and the angle of incidence from each illumination optical fiber 2 to the sample surface 6 is θ ₁ respectively. The angles are different like θ ₂ …. As described with reference to FIG. 12 as a color measurement technique, a plurality of different incident conditions can be applied to the sample measurement unit when the color of the sample changes due to light having different incident angles. By introducing this reflected light into the light receiving fiber 1 and performing computer analysis as received light data, the color and gloss of the sample can be measured with higher accuracy.

5, 6 and 7 are similar to the illumination / light receiving device shown in FIGS. 1, 2 and 3 described above, but the illumination optical fiber 2 is moved to the center and a plurality of it is arranged around it. This is a structure surrounded by a light receiving fiber 1 of a book, and the effect thereof is almost the same as that of FIG. 1, FIG. 2, and FIG.

FIG. 8 shows still another embodiment, in which the end face 4 of the receiving fiber 1 is based on a predetermined regularity.
Are set to have different inclination angles, and the reflected light 7, 7 ... With different angles such as θ ₁ θ ₂ ... It can be introduced. As described with reference to FIG. 12 as a color measurement technique, this is because the reflection amount of light, for example, the color component and the gloss component, differ in the direction from the sample surface, so that the reflection amount of light is different at different angles. It can be grasped in many ways.

By introducing the light in the plurality of reflection directions into the light receiving fiber 2 and performing computer analysis as light reception data, the color and gloss of the sample can be measured with higher accuracy.

FIG. 9 shows still another embodiment, which is shown in FIG.
Although the same principle is used, the light receiving fibers 1 having different distances from the sample surface 6 to the end surface 4 are arranged around the illumination optical fiber 2. Even with such a structure, the amount of light reflected from the sample surface 6 can be grasped in various directions with different angles.

FIGS. 10 and 11 show still another embodiment, in which a plurality of light receiving fibers 1 are arranged in a multi-layer around an illuminating optical fiber 2. In principle, the embodiment shown in FIGS. 8 and 9 is used. It is a structure that looks like a combination.

This is particularly because the end faces 4 of the light receiving fiber 1 have different inclination angles, and the end faces 4 and the sample surface 6 are different from each other.
Are also different in distance from each other, and each end surface 4 and the sample surface 6 form a substantially hemispherical space. When performing a computer analysis based on the received light data obtained from these light receiving fibers, R ₁ R ₂ R ₃ ...
It is necessary to add initial positioning in advance and analyze the data obtained from it. This method functions as a differential sphere with respect to the integrating sphere of the spectrocolorimeter.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are changes and additions within the scope not departing from the gist of the present invention, the present invention is not limited. Included in the invention. For example, the fibers are formed in a cylindrical shape, but the bundle can be arranged in a plate shape.

[0034]

The present invention has the following effects.

(A) Of the bundle of optical fibers, a predetermined number is used as a light receiving fiber, and the other is used as an illuminating optical fiber, and by simply bringing the fiber end face close to the sample surface, both functions of illuminating and receiving light can be obtained at the same time. It is possible to obtain an illumination / light receiving device that is extremely simple.

(B) By using the positions of the light receiving fiber and the illuminating optical fiber, the end face shape, the lens, and the like, it is possible to easily obtain light receiving data of geometrically multi-conditions.

[0037]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a second embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of the present invention.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a sectional view of a fifth embodiment of the present invention.

FIG. 8 is a sectional view of a sixth embodiment of the present invention.

FIG. 9 is a sectional view of a seventh embodiment of the present invention.

FIG. 10 is a transverse sectional view of an eighth embodiment of the present invention.

11 is a cross-sectional view taken along line CC of FIG.

FIG. 12 is a schematic diagram showing a conventional general colorimetric principle.

[Explanation of symbols]

 1 Receiving fiber 2 Illumination optical fiber 3 Skirt shield 4 End face 5 Irradiation light 6 Sample surface 7 Reflected light 8 Lens

Claims (11)

[Claims] 1. A structure in which a large number of optical fibers are bundled, at least one optical fiber among these optical fibers is used as a light receiving fiber, and another optical fiber is used as an illuminating optical fiber, and light is emitted from an end face of the illuminating optical fiber to a sample measuring section. And an illumination / light receiving device capable of receiving the light reflected from the end face of the light receiving fiber. 2. The illuminating / receiving device according to claim 1, wherein a large number of illuminating optical fibers surround a light receiving fiber in a substantially central portion. 3. The method according to claim 1, wherein at least an end surface of the illuminating optical fiber is an inclined surface, and light is refracted by the inclined surface so that light can be condensed at a predetermined position on the sample surface. Illuminator and receiver. 4. The illuminating / receiving device according to claim 1, wherein a condenser lens is installed on at least an end face of the illuminating optical fiber, and the lens is capable of condensing at a predetermined position on the sample surface. 5. The tilted surfaces, which are the end surfaces of the illuminating optical fiber, have tilt angles different from each other, and by applying light with different irradiation angles to the sample measuring section, it is possible to obtain light reception data of geometrical multi-conditions. The illumination-light-receiving device according to claim 3, wherein: 6. The illumination / light-receiving device according to claim 1, wherein a large number of light-receiving fibers surrounds the illumination optical fiber at a substantially central portion. 7. The light receiving fiber has at least an end surface which is an inclined surface, and the light reflected by the sample surface can be received by the light receiving fiber by utilizing the refraction of light by the inclined surface. Or the illumination / light-receiving device according to item 6. 8. The illuminating / receiving device according to claim 1, wherein a lens is installed on at least an end surface of the light receiving fiber, and the light reflected from the sample surface by the lens can be received by the light receiving fiber. 9. The light receiving fibers have inclined surfaces which are end surfaces having different inclination angles from each other, and light having different reflection angles reflected from the sample measuring section is subjected to geometric multi-conditions from the end surfaces of these light receiving fibers. The illumination-light receiving device according to claim 7, which is obtained as light-receiving data. 10. The light receiving fibers are arranged such that the distances between the end surfaces of the light receiving fibers and the sample measuring section are different depending on the respective light receiving fibers, and the light reflected by the sample measuring section has different reflection angles. 2. The geometrically multi-condition light reception data is obtained from
Or the illumination / light-receiving device according to item 6. 11. The light illuminating optical fiber and each light receiving fiber are arranged so as to have different distances, and light having different reflection angles reflected from the sample measuring portion is subjected to geometric multi-conditions from the end faces of these light receiving fibers. The illumination / light receiving device according to claim 1, which is obtained as light reception data.