JPS6029050B2 - Device to determine fading of color materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for determining the brown color of a coloring material attached to or contained in an industrial product for coloring the industrial product.

It is known that deterioration of coloring materials such as pigments and dyes, or discrimination between two types of coloring materials in a specific relationship, is possible without measuring their reflectance over the entire wavelength range.

FIG. 1 is a graph plotting the distribution of reflectance versus wavelength for three types of the same blue pigment.

In the figure, the curve S indicates the distribution of bright blue reflectance immediately after manufacture, the curve S2 indicates the distribution of degraded blue reflectance, and the curve S3 indicates the distribution of blue reflectance that has deteriorated further. An object of the present invention is to provide an apparatus for determining the color of a coloring material for industrially determining and sorting the brown color of a coloring material attached to or contained in an industrial product in order to color the product.

In order to achieve the above object, the apparatus for determining the brown color of a coloring material according to the present invention is capable of determining the brown color of an article whose reflectance changes at two wavelengths as a result of the brown color, and where there is substantially no change in reflectance at two wavelengths. This is a device for discriminating the brown color of a coloring material, which includes a light source that projects light containing components of the wavelength input and input 2 toward the measurement target, and a light source that projects light containing components of the wavelength input and input 2 of the reflected light from the measurement target. a measuring circuit portion that detects and amplifies the component, a detector that detects the component of the wavelength input 2 among the reflected light components from the measurement object, and returns the output of the detector to the light source to keep the detection output of the detector constant. including a return device that maintains the wavelength ^,
It is configured to determine brown color by measuring the output difference between the two.

According to the above configuration, the apparatus can be configured extremely easily, and the light source can be rationally managed in a system including the object to be measured, so that stable measurement is possible, and the object of the present invention is completely achieved. The present invention will be described in more detail below with reference to the drawings and the like.

FIG. 2 is a block diagram showing an embodiment of an apparatus for determining the color of a coloring material according to the present invention.

Light from a light source including a wavelength input and a wavelength input 2 (see FIG. 1) is projected toward a measurement object 2.

The light source can be easily realized with a tungsten bulb, since the tungsten bulb has a wavelength distribution over a wide range. The reflected light from the measurement target is supplied to the photoelectric conversion element 5 via the narrow band filter 3 that passes the wavelength ^, and to the photoelectric conversion element 6 via the narrow band filter 4 that passes the wavelength input 21. . The output of the photoelectric conversion element 5 is amplified by an amplifier 7 and displayed on a display device 8. On the other hand, amplifier 7
The output is applied to a discriminator 9 having a threshold level, and the output of the discriminator 9 activates a discrimination mechanism (not shown). The output of the photoelectric conversion element 6 is amplified by an amplifier 10, and the output is compared with the output of a reference voltage device 11 by a comparator 12.

The output of the comparator 12 controls the power regulating device 13 to control the power supplied from the power source 14 to the light source 1. More specifically, when the output of the photoelectric conversion element 6 is smaller than the set value, the power supplied to the light source 1 is increased, and when it is larger, the power supplied to the light source 1 is controlled to be decreased. In the apparatus configured as described above, S, , S2, S3 shown in FIG.
It is assumed that coloring materials having the characteristics are sequentially brought to predetermined positions as the measurement object 2.

In the device according to the present invention, since the feedback system is operated so that the output of the element 6 is constant, the output of the photoelectric conversion element 6 that detects the reflected light of wavelength 2 is the same unless the conditions change in each target. It should be. On the other hand, the output of the photoelectric conversion element 5 decreases in the order of S3, S2, and S. Therefore, if the threshold level of the discriminator 9 is set appropriately, S3 and S2 can be eliminated. The light from light source 1 includes wavelengths input and input 2, and in a normal light source, the output component ratio of input and input 2 always maintains a constant ratio, so there is no practical problem, so measurement target 2 is Since it is always irradiated with two components with a constant energy ratio, and the amount of light passing through the filter 4 is kept constant, the output of the spotlight circuit including the photoelectric element 5 is adjusted appropriately. If the reflectance is amplified to 2, the reflectance at wavelength input 2 can be directly read, and furthermore, by setting an appropriate reflectance in the discriminator 9, it is possible to discriminate the object to be measured having a reflectance above or below a certain level. As is clear from the above description, the apparatus for discriminating the brown coloring material according to the present invention not only has an extremely simple and industrial construction, but also has the following excellent features.

First, since the measurement is performed in a narrow band, the influence of external noise is reduced.

When setting up the apparatus, there is no need to adjust the side light system even if there is a distance difference between the light source 1 and the object to be measured 2.

This is true even when objects to be measured are sent one after another, and even if the objects are closer or farther depending on the object, it does not cause measurement errors. Furthermore, even if the efficiency of the light projection optical system changes, no error occurs in measurements before and after the change. Therefore, the device according to the present invention can be fully utilized even in places where the environment is not well maintained.

Although an example of electrical feedback has been shown as an embodiment of the feedback system for controlling the brightness of the light source 1, the present invention can also be achieved by using a negative feedback system that includes a mechanical element such as moving an optical wedge. Able to achieve purpose.

[Brief explanation of the drawing]

FIG. 1 is a graph for explaining changes in reflectance due to deterioration of a coloring material, and FIG. 2 is a block diagram showing an embodiment of an apparatus for determining the brown color of a coloring material according to the present invention. 1... Light source, 2... Measurement object, 3, 4...
...Filter, 5...Photoelectric conversion element of measurement circuit, 6...Photoelectric conversion element of detection circuit, 7,1
0...Amplifier, 8...Display device, 9.
... Discriminator, 11 ... Standard voltage source, 12
... Comparator, 13 ... Control device, 14
…···power supply. Figure 1 Figure 2

Claims (1)

[Claims] 1 An apparatus for determining fading of a coloring material for determining fading of an article, in which the reflectance at wavelength λ_1 changes as a result of fading and there is no substantial change in reflectance at wavelength λ_2, which detects components at wavelengths λ_1 and λ_2. A light source that projects light including light toward the object to be measured, a measurement circuit that detects and amplifies the component of wavelength λ_1 of the light reflected from the object to be measured, and a component of wavelength λ_2 of the light component of the reflected light from the object to be measured. and a feedback device that feeds back the detector output to the light source to keep the detection output of the detector constant, and has a wavelength λ_1.
An apparatus for determining fading of a coloring material, the device being configured to determine fading by measuring an output of a coloring material.