TWI784003B - Color measuring device and color measuring method - Google Patents

Abstract

[Problem] Light is received at a measurement time point at which a sufficient amount of received light can be obtained, and the color of a measurement object is measured with high accuracy. [Solution] A color measuring device measures the color of the measurement object based on reflected light from the measurement object, and is configured as follows: a light source for irradiating light; a rotating plate for performing a plurality of interference filters The light from the light source is split around the rotation; the light receiving sensor receives the light that has been split in a plurality of interference filters; and the correction part divides the light receiving sensor according to the spectral distribution of the light receiving sensor The measurement time point is corrected from the theoretical value to the measured value of the peak value of the spectral distribution. At the corrected measurement time point, the light receiving sensor receives the reflected light from the measurement object and measures the color of the measurement object.

Description

Color measuring device and color measuring method

FIELD OF THE INVENTION The present invention relates to a colorimetric device and a colorimetric method for measuring the color of an object to be measured.

Background of the Invention Conventionally, as a colorimetric device, a device that irradiates a measurement object with light from a light source and decomposes the reflected light from the measurement object for each wavelength to measure the color of the measurement object ( For example, refer to Patent Document 1). In the colorimetric device described in Patent Document 1, light is irradiated to a measurement object so that reflected light from the measurement object passes through an interference filter provided on a rotating plate and is received by a light-receiving sensor. A plurality of interference filters with different transmission wavelengths are arranged around the rotation axis on the rotation plate, and the interference filters are sequentially switched by rotation of the rotation plate, thereby splitting the reflected light from the measuring object. Also, the color of the measuring object can be measured from the light receiving result of the light receiving sensor for each transmitted wavelength. Prior Art Documents Patent Documents

Patent Document 1: Japanese Patent Laid-Open No. 2017-036937

Summary of the Invention Problems to be Solved by the Invention However, in the above-mentioned colorimetric device, due to mechanical errors, etc., there may be deviations in the measurement time point when the center of the interference filter coincides with the center of the light-receiving sensor. Condition. If the measurement is performed in a state where the center of the light-receiving sensor and the center of the interference filter are deviated, there is a possibility that a sufficient light-receiving amount cannot be obtained and measurement accuracy may deteriorate.

The present invention was made in view of this point, and one of its objects is to provide a colorimetric device that receives light at a measurement time point at which a sufficient amount of received light can be obtained, and measures the color of a measurement object with high accuracy. and color measurement methods. means to solve problems

A colorimetric device according to an aspect of the present invention measures the color of the measurement object based on reflected light from the measurement object. The colorimetric device is characterized in that: it is equipped with: The filter rotates around to split the light from the aforementioned light source; the light receiving sensor receives the light that has been split in the aforementioned plurality of interference filters; and the correction part, based on the spectral distribution of the aforementioned light receiving sensor, Correct the measurement time point of the aforementioned light-receiving sensor from a theoretical value to an actual measured value that can obtain the peak value of the aforementioned spectral distribution, and use the aforementioned light-receiving sensor to receive reflected light from the aforementioned measurement object at the corrected measurement time point , and measure the color of the aforementioned measuring object.

A color measurement method according to an aspect of the present invention is to measure the color of the measurement object based on reflected light from the measurement object. The light from the light source is split, and the light receiving sensor is used to receive the light that has been split in the aforementioned plurality of interference filters; according to the spectral distribution of the aforementioned light receiving sensor, the determination of the aforementioned light receiving sensor A step of correcting the time point from a theoretical value to an actual measured value at which the peak value of the aforementioned spectral distribution can be obtained; and receiving reflected light from the aforementioned measurement object with the aforementioned light receiving sensor at the corrected measurement time point, and measuring the aforementioned measurement object of color steps.

According to these configurations, by rotating the plurality of interference filters to split the light from the light source, the spectral distribution of the light transmitted by the interference filters can be obtained. Even if the theoretical value of the measurement time point of the light-receiving sensor deviates from the peak value of the spectral distribution due to mechanical errors, etc., the measurement time point of the light-receiving sensor can still be corrected to obtain the peak value of the spectral distribution The measured value. Accordingly, the reflected light from the measurement object can be received at the peak of the spectral distribution at the measurement time point, and the received light amount of the reflected light can be obtained sufficiently to measure the color of the measurement object with high accuracy.

In the above color measuring device, the rotating plates are a pair of rotating plates provided with a plurality of interference filters and through holes, and among the pair of rotating plates, one of the rotating plates is stopped, and the other rotating plate is rotated so that the plurality of interference filters of the other rotating plate are sequentially exposed from the through hole of one of the rotating plates. According to this configuration, the light from the light source can be split by the through hole of one of the rotating plates and the interference filter of the other rotating plate. By distributing and installing a plurality of interference filters on a pair of rotating plates, the rotating plates can be made smaller and the entire device can be miniaturized.

In the above-mentioned colorimetric device, the actual measured value and the theoretical value of the peak of the spectral distribution that can be obtained are represented by pulses of the pulse motor, and the correction unit converts the measurement time point of the light-receiving sensor from the pulse of the theoretical value Corrected to obtain the pulse of the actual measured value of the peak value of the aforementioned spectral distribution. According to this configuration, the measurement time point can be corrected in units of pulses of the pulse motor.

In the above color measuring device, the aforementioned light source is an LED light source. According to this configuration, even with an LED light source whose light intensity is not stable for each wavelength, it is possible to measure the reflected light from the measurement object at the measurement timing when the received light amount becomes large.

In the colorimetric device described above, the light receiving sensor receives light from the light source including reflected light from the measurement object when the correction unit corrects the measurement time point. According to this configuration, the measurement time point can be corrected by using the reflected light from the measurement object. Invention effect

According to the present invention, the measurement time point of the light-receiving sensor can be corrected from a theoretical value to an actual measurement value that can obtain the peak value of the aforementioned spectral distribution, so that the reflected light from the measurement object can be fully received and the measurement accuracy can be improved.

Modes for Carrying Out the Invention Hereinafter, a colorimetric device according to this embodiment will be described with reference to the attached drawings. FIG. 1 is a perspective view of a colorimetric device according to this embodiment. In addition, the colorimetric device of this embodiment is just an example, and it can change suitably.

As shown in FIG. 1 , the colorimetric device 1 is a device for measuring the color of an object W to be measured by a spectrophotometric method, and is configured such that the object W is irradiated with light from a light source 21 (see FIG. 2 ), and the light from The reflected light spectrum of the object W is measured to measure the color. The upper surface of the device cover 11 of the colorimetric device 1 is provided with a mounting surface 12 capable of carrying the measuring object W, and an opening window 13 ( Refer to Figure 2). On the front side of the device cover 11 are disposed an operation panel 14 for receiving input of various information and an LCD (Liquid Crystal Display) 15 for displaying various menus.

As shown in FIGS. 2 and 3 , a light source 21 for irradiating light toward the measurement object W is provided inside the device cover 11 . As the light source 21 , for example, a white LED (Light Emitting Diode), a near-ultraviolet LED, and a near-infrared LED having a long life can be used. By using three types of LEDs, the light quantities near the short-wavelength end and the long-wavelength end where the light quantity becomes small in white LEDs can be set to be large. The light from the light source 21 is divided on the half mirror (half mirror) 22, and the light transmitted by the half mirror 22 is input to the integrating sphere 25 through the first and second lenses 23 and 24, and the half mirror 22 transmits the light to the integrating sphere 25. The reflected light is received by the light receiving sensor 26 which monitors the change of the light source 21 .

The upper part of the integrating sphere 25 is opened as the opening window 13 of the device cover 11 , and the measuring object W is partially exposed in the integrating sphere 25 through the opening window 13 . The light that has entered the integrating sphere 25 is diffusely reflected, and passes through the opening window 13 to irradiate the measurement object W with light from all directions. Thereby, the influence of the irregular shape of the measuring object W can be reduced. The lower part of the integrating sphere 25 is provided with an opening 31 for trapping which suppresses regular reflection of the object W to be measured, and an opening 34 for receiving light which takes in reflected light from the object W to be measured. The trapping member 32 is provided in the trapping opening 31 , and a part of the light is removed by the trapping member 32 so as to prevent the measuring object W from regular reflection on the light-receiving opening 34 .

Moreover, the reflector 33 for collection which opens and closes the opening 31 for collection is provided in the lower part of the integrating sphere 25. As shown in FIG. By opening and closing the collecting reflector 33, the measurement method of the colorimetric device 1 can be switched to: the SCI (Specular Components Include) method that includes the specular reflection component, and the SCE (Specular Components Include) method that removes the specular reflection component. Exclude specular reflection components, Specular Components Exclude) method. The reflected light that has entered the light-receiving opening 34 is condensed on the mirror 36 by the third lens 35 , and the reflected light reflected on the mirror 36 is condensed toward the light-receiving sensor 38 by the fourth lens 37 . A beam splitter 41 is provided between the fourth lens 37 and the light-receiving sensor 38 , and the beam splitter 41 splits the reflected light from the measurement object W through a pair of rotating plates 42 .

The beam splitter 41 is configured by attaching a pair of rotating plates 42 to output shafts of a pair of pulse motors 43 (only one is shown in FIG. 2 ). A plurality of interference filters 45 and through-holes 46 having different transmission wavelengths are provided on each rotating plate 42 (see FIG. 4A ). By using a pair of rotating plates 42 to rotate the plurality of interference filters 45 around, the plurality of interference filters 45 can be sequentially positioned on the optical path of the reflected light. In this way, by rotating the plurality of interference filters 45, the transmission wavelength can be switched, whereby the reflected light from the measurement object W can be split. Note that the detailed configuration of the spectroscope 41 will be described later.

The reflected light that has been split by a plurality of interference filters 45 is received by the light receiving sensor 38 . The light-receiving sensor 38 is a photoelectric conversion element such as a photosensor, and outputs a sensed value (light-receiving amount) of each split reflected light to the control substrate 51 . On the control board 51, various parts such as a correction unit 52 (see FIG. 4 ) and a colorimetric unit 53 (see FIG. 4 ) are provided. The correction unit 52 and the color measurement unit 53 are constituted by a processor, a memory, and the like that execute various processes. The memory is composed of one or more storage media such as ROM (Read Only Memory), RAM (Random Access Memory, Random Access Memory) according to the purpose, and stored in the memory Implement the control program of the color measurement method, etc.

In the colorimetric device 1 configured in this way, the light receiving amount of the light receiving sensor 38 can be made to peak at the point in time when the center of the interference filter 45 coincides with the center of the light receiving sensor 38 . However, if a mechanical error occurs due to the assembly of the pair of rotating plates 42 or the dimensional tolerance of the interference filter 45, etc., the measurement time point at which the center of the interference filter 45 and the center of the light-receiving sensor 38 coincide will be There is a deviation before and after. Therefore, measuring at a theoretical measuring time point without considering mechanical errors means measuring at a measuring time point where the center of the interference filter 45 has a positional deviation from the center of the light-receiving sensor 38 , so that the amount of light received by the light receiving sensor 38 becomes smaller.

In particular, in the light source 21 such as an LED light source, the amount of light is not stable for each wavelength, and the amount of light becomes extremely small at some wavelengths. Therefore, if a deviation occurs at the measurement time point at a wavelength at which a sufficient amount of light cannot be obtained, the light-receiving sensor 38 may not be able to obtain a sufficient amount of light received, which may degrade measurement accuracy. Therefore, in this embodiment, the actual measurement value at the measurement time point at which the peak value of the spectral distribution of the light receiving sensor 38 is obtained is obtained, and the measurement time point of the light receiving sensor 38 is corrected from the theoretical value to the actual measurement value. The value is formed so that the measurement time point coincides with the peak of the spectral distribution.

Hereinafter, the spectroscope will be described with reference to FIG. 4 . Fig. 4 is a schematic top view and a schematic cross-sectional view of the beam splitter of the present embodiment.

As shown in FIG. 4A and FIG. 4B , the pair of rotating plates 42 of the beam splitter 41 is a circular plate in which a plurality of interference filters 45 and a through hole 46 are arranged in the circumferential direction, and is arranged to face the light receiving sensor. The optical path of the device 38 partially overlaps. An output shaft 44 of a pulse motor 43 is fixed at the center of the pair of rotating plates 42 , and the pair of rotating plates 42 is rotated around the output shaft 44 by the pulse motor 43 . At this time, one of the rotating plates 42 is stopped in the state where the through hole 46 has been positioned on the optical path, and only the other rotating plate 42 rotates, so that the plurality of interference filters 45 of the other rotating plate 42 sequentially pass through it. A through opening 46 of a rotating plate 42 is exposed.

In this way, the light path toward the light-receiving sensor 38 is cross-cut by the interference filters 45 having different transmission wavelengths, so that the light transmitted through the through hole 46 and the interference filter 45 is split according to each transmission wavelength. In addition, the light split by the plurality of interference filters 45 is received by the light receiving sensor 38 . Accordingly, the light from the light source 21 (refer to FIG. 2 ) can be split by the through hole 46 of one of the rotating plates 42 and the interference filter 45 of the other rotating plate 42 . Moreover, by distributing and installing the plurality of interference filters 45 on the pair of rotating plates 42, the rotating plates 42 can be made smaller and the colorimetric device 1 as a whole can be miniaturized.

In addition, a correcting unit 52 and a colorimetric unit 53 are connected to the light receiving sensor 38. The correcting unit 52 corrects the deviation of the measurement time point of the light receiving sensor 38 caused by a mechanical error or the like. The color unit 53 measures the color of the measurement object W by receiving the reflected light from the measurement object W at the corrected measurement time point. When correcting the measurement time point by the correcting unit 52, the opening window 13 of the integrating sphere 25 (see FIG. 2 ) is closed so that the light from the light source 21 is not reflected on the measurement object W. The light receiving sensor 38 continuously receives light. The correction unit 52 corrects the measurement time point of the light-receiving sensor 38 from a theoretical value to an actual measured value that can obtain the peak value of the spectral distribution according to the spectral distribution of the light-receiving sensor 38 .

When measuring the color of the measuring object W by the colorimetric unit 53, the opening window 13 of the integrating sphere 25 (refer to FIG. The sensor 38 receives reflected light from the measurement object W. As shown in FIG. The color measurement unit 53 measures the color of the measurement object W by intermittently receiving the reflected light from the measurement object W with the light receiving sensor 38 at the corrected measurement time point. In the color measurement unit 53, various processes are applied to the sensing value of the light receiving sensor 38 at the measurement time point (transmission wavelength), and converted into XYZ color system, L ^* a ^* b ^* color system, L ^* C ^* h ^* the value of the color system, etc., and express the color of the measurement object W in numerical values.

Next, correction processing of the measurement time point will be described with reference to FIGS. 5 to 8 . Fig. 5 is a graph showing an example of light source characteristics of the present embodiment. Fig. 6 is a graph showing an example of transmission characteristics of a plurality of interference filters according to this embodiment. FIG. 7 is a graph showing an example of output characteristics of the light receiving sensor of the present embodiment. Fig. 8 is a diagram showing an example of correction processing of the measurement time point in this embodiment. Furthermore, in FIG. 5 to FIG. 8 , it is shown that a white LED is used as the light source. In addition, here, for the convenience of description, the symbols in FIG. 2 and FIG. 3 are appropriately used for description.

As shown in FIG. 5 , the light source 21 has a steep mountain-shaped spectrum on the short-wavelength side, and a gentle mountain-shaped spectrum from the middle wavelength to the long wavelength. Moreover, as shown in FIG. 6 , transmission wavelength regions are set at predetermined intervals on the plurality of interference filters 45 . Therefore, when the light receiving sensor 38 receives the light from the light source 21 through a plurality of interference filters 45, as shown in FIG. A steep peak appears at the transmitted wavelength. Since the amount of light received by the light-receiving sensor 38 becomes larger at the peak of the spectral distribution, it is desirable to perform the measurement at a measurement time when the peak of the spectral distribution can be obtained.

In this case, since the driving source of the pair of rotating plates 42 is the pulse motor 43, the pair of rotating plates 42 is rotated one pulse at a time, while the light receiving sensor 38 receives The light transmitted by a plurality of interference filters 45 . Therefore, the peak value of the spectral distribution, that is, the measurement time point of the light-receiving sensor 38 can be represented by the pulse of the pulse motor 43 . Although the theoretical measurement time point is set on the colorimetric device 1 under the condition that no mechanical error occurs, in reality, even if a small amount of mechanical error occurs, the theoretical measurement time point However, the center of the interference filter 45 does not coincide with the center of the light-receiving sensor 38 .

Therefore, as shown in FIG. 8 , correction processing can be performed on the measurement timing (measurement trigger) of the light receiving sensor 38 . In the correction process of the measurement time point, the rotating plate 42 is rotated by the pulse motor 43 in a pulse-by-pulse manner, while passing through the interference filter 45 and receiving light from the light source 21 continuously with the light receiving sensor 38 . of light. In this way, the spectrum of reflected light having a plurality of steep peaks can be obtained. Although the theoretical value at the time of measurement is set at intervals of 100 pulses by the pulse of the pulse motor 43 in advance, the theoretical value at the time of measurement deviates from the peak value of the actual spectral distribution by several pulses.

At this time, the pulse at which the peak of the spectral distribution can be obtained is obtained as an actual measurement value by the correction unit 52, and the measurement time point of the light receiving sensor 38 is corrected from a theoretical value to an actual measurement value. Specifically, 50 pulses, 150 pulses, 250 pulses... set as theoretical values are corrected to 52 pulses, 151 pulses, 251 pulses... which are actually measured values showing the peak of the spectral distribution. Then, the light-receiving sensor 38 intermittently receives the reflected light of the measurement object W at the corrected measurement time point, and the colorimetric unit 53 obtains the light-receiving amount of the light-receiving sensor 38 with a predetermined wavelength. The color of the measuring object W is measured.

Next, a measurement method performed by the colorimetric device will be described with reference to FIG. 9 . Fig. 9 is a diagram showing an example of a measurement method performed by the colorimetric device according to the present embodiment.

As shown in Figure 9A, when measuring the correction of the time point, the opening window 13 of the integrating sphere 25 is closed, and the light from the light source 21 is input to the integrating sphere 25 through the first and second lenses 23 and 24, and from the Light from the light source 21 is diffusely reflected by the integrating sphere 25 . The diffusely reflected light on the integrating sphere 25 is condensed on the mirror 36 by the third lens 35 , and condensed on the light receiving sensor 38 by the fourth lens 37 and transmitted through the beam splitter 41 . In the beam splitter 41 , the other rotating plate 42 is rotated while the through hole 46 of one of the rotating plates 42 is positioned on the optical path. Accordingly, the light from the light source 21 is split by the rotation of the plurality of interference filters 45 and received by the light receiving sensor 38 .

As shown in FIG. 9B , the light transmitted through the interference filter 45 is continuously received by the light-receiving sensor 38 in a state where the rotary plate 42 is rotated pulse by pulse. In this way, the spectral distribution of the light-receiving sensor 38 can be generated. At this time, although the theoretical value is set at predetermined pulse intervals as the measurement time point of the light receiving sensor 38 , the theoretical value deviates from the peak value of the spectral distribution of the light receiving sensor 38 by several pulses. In the correction unit 52 , based on the spectral distribution of the light-receiving sensor 38 , the measurement time point of the light-receiving sensor 38 is corrected from a theoretical value to an actual value at which the peak value of the spectral distribution can be obtained.

As shown in FIG. 9C , when measuring the color of the measuring object W, the opening window 13 of the integrating sphere 25 is opened to expose the measuring object W from the opening window 13 to the integrating sphere 25 . The light from the light source 21 is input to the integrating sphere 25 through the first and second lenses 23 and 24 , and the light from the light source 21 is diffusely reflected on the integrating sphere 25 and irradiates the measuring object W through the opening window 13 . The reflected light from the measurement object W is condensed on the mirror 36 by the third lens 35 , and condensed by the light receiving sensor 38 by the fourth lens 37 and transmitted through the beam splitter 41 . The reflected light from the measuring object W is split by a plurality of interference filters 45 of the spectroscope 41 . Then, the light-receiving sensor 38 intermittently receives the reflected light from the measurement object W at the corrected measurement time point to measure the color of the measurement object W.

As described above, in the colorimetric device 1 of the present embodiment, the light from the light source 21 is split by the rotation of the plurality of interference filters 45 to obtain the spectral distribution of the light transmitted through the interference filters 45 . Even if the theoretical value of the measurement time point of the light-receiving sensor 38 deviates from the peak value of the spectral distribution due to mechanical errors, etc., the measurement time point of the light-receiving sensor can still be corrected so that the spectral distribution can be obtained. The measured value of the peak value. According to this, the reflected light from the measurement object W can be received at the peak of the spectral distribution at the measurement time point, and the received light amount of the reflected light can be obtained sufficiently to measure the color of the measurement object W with high accuracy.

In addition, although this embodiment exemplifies a configuration in which the measurement time point is corrected by light that does not include reflected light from the measurement object, the measurement time point may be corrected by light that includes reflected light from the measurement object. In this case, when the measurement time point is corrected by the correction unit, the opening window is opened to irradiate the measurement object with light from the light source, and the light receiving sensor receives the reflected light from the light source including the measurement object. of light. In addition, the correcting unit corrects the measurement time point of the light-receiving sensor from a theoretical value to an actual measurement value at which a peak of the spectral distribution can be obtained, based on the spectral distribution of the light-receiving sensor. Thereby, the measurement time point can be corrected using the reflected light from the measurement object.

In addition, in the present embodiment, the light from the light source is split by a pair of rotating plates provided with a plurality of interference filters and through holes, but it is not limited to this structure. The number of rotating plates is not particularly limited, and the light from the light source can be split by a plurality of interference filters installed on a single rotating plate, or by a plurality of interference filters installed on three or more rotating plates The detector splits the light from the light source.

In addition, in this embodiment, although it is set as the structure which drives a rotating plate by a pulse motor, it is not limited to this structure. The rotary plate may be driven by other rotary actuators such as a servo motor as long as it is rotatable.

In addition, in the present embodiment, although the light source is configured as an LED, it is not limited to this configuration. The light source may be configured in any manner as long as it can illuminate the measurement object. For example, any type of light source of incandescent luminescence type, discharge luminescence type, or electroluminescence type can also be used as the light source. As the light source of the incandescent light emitting type, for example, incandescent bulbs and halogen lamps can also be used, as the light source of the discharge light emitting type, for example, fluorescent lamps and HID lamps can also be used, as the light source of the electroluminescence type, and for example, organic EL, Inorganic EL.

Moreover, although embodiment and modification of this invention were demonstrated, the aspect which combined whole or part of said embodiment and modification as another embodiment of this invention is also possible.

In addition, the embodiments of the present invention are not limited to the above-mentioned embodiments and modified examples, and various changes, substitutions, and modifications can be made without departing from the scope of the technical idea of the present invention. In addition, if the technical idea of the present invention can be realized in other ways through technological progress or other derived technologies, this method can also be used for implementation. Therefore, the scope of the patent application covers all implementation aspects that can be included in the scope of the technical idea of the present invention.

Furthermore, in the above-mentioned embodiment, it is a colorimetric device for measuring the color of the measurement object based on reflected light from the measurement object, and it is characterized in that it includes: a light source for irradiating light; a rotating plate for making a plurality of interference filters The light from the light source is split by rotating around; the light receiving sensor receives the light that has been split in a plurality of interference filters; and the correcting part is based on the spectral distribution of the light receiving sensor The measurement time point of the instrument is corrected from the theoretical value to the actual measurement value of the peak value of the spectral distribution. At the corrected measurement time point, the light-receiving sensor receives the reflected light from the measurement object and measures the color of the measurement object. . According to this configuration, by rotating the plurality of interference filters to split the light from the light source, the spectral distribution of the light transmitted by the interference filters can be obtained. Even if the theoretical value of the measurement time point of the light-receiving sensor deviates from the peak value of the spectral distribution due to mechanical errors, etc., the measurement time point of the light-receiving sensor can still be corrected to obtain the peak value of the spectral distribution The measured value. According to this, the reflected light from the measurement object can be received at the peak of the spectral distribution at the measurement time point, and the received light amount of the reflected light can be obtained sufficiently to measure the color of the measurement object with high accuracy. Industrial availability

As explained above, the present invention has the effect of being able to receive light at the measurement time point at which the received light amount can be obtained sufficiently, and measure the color of the measurement object with good accuracy. The color method is particularly useful.

1‧‧‧color measuring device 11‧‧‧device cover 12‧‧‧loading surface 13‧‧‧opening window 14‧‧‧operation panel 15‧‧‧LCD21‧‧‧light source 22‧‧‧half mirror 23 ‧‧‧First lens 24‧‧‧Second lens 25‧‧‧Integrating sphere 26, 38‧‧‧Light receiving sensor 31‧‧‧Catching opening 32‧‧‧Catching member 33‧‧‧Catching Reflector for collection 34‧‧‧opening for light receiving 35‧‧‧third lens 36‧‧‧mirror 37‧‧‧fourth lens 41‧‧‧beam splitter 42‧‧‧rotating plate 43‧‧‧pulse motor 44 ‧‧‧output shaft 45‧‧‧interference filter 46‧‧‧through hole 51‧‧‧control substrate 52‧‧‧correction part 53‧‧‧color measurement part W‧‧‧measurement object

FIG. 1 is a perspective view of a colorimetric device according to this embodiment. Fig. 2 is a longitudinal sectional view of the colorimetric device of the present embodiment. Fig. 3 is a transverse cross-sectional view of the colorimetric device of the present embodiment. Fig. 4 is a schematic top view and a schematic cross-sectional view of the beam splitter of the present embodiment. Fig. 5 is a graph showing an example of light source characteristics of the present embodiment. Fig. 6 is a graph showing an example of transmission characteristics of a plurality of interference filters according to this embodiment. FIG. 7 is a graph showing an example of output characteristics of the light receiving sensor of the present embodiment. Fig. 8 is a diagram showing an example of correction processing of the measurement time point in this embodiment. Fig. 9 is a diagram showing an example of a measurement method performed by the colorimetric device of this embodiment.

1‧‧‧Color measuring device

21‧‧‧Light source

23‧‧‧First lens

24‧‧‧Second lens

25‧‧‧Integrating sphere

35‧‧‧Third lens

36‧‧‧mirror

37‧‧‧4th lens

38‧‧‧Light receiving sensor

41‧‧‧light splitter

42‧‧‧Rotating plate

45‧‧‧Interference filter

46‧‧‧through hole

Claims (5)

A color measuring device, characterized in that it has: a light source for irradiating light; an integrating sphere with an opening window, the opening window can be switched to an open state that exposes the measurement object and a closed state that does not expose the measurement object. In the open state of the opening window, the light from the light source includes the reflected light from the measurement object and is diffusely reflected. On the other hand, in the closed state of the opening window, the light from the light source does not include the reflection light from the measurement object. Reflecting light for diffuse reflection; rotating the plate to make a plurality of interference filters rotate around to split the light from the aforementioned integrating sphere; a light receiving sensor to receive the light that has been split in the aforementioned plurality of interference filters; The correcting part corrects the measurement time point of the aforementioned light-receiving sensor from a theoretical value to an actual measured value that can obtain the peak value of the aforementioned spectral distribution according to the spectral distribution of the aforementioned light-receiving sensor; and the color measurement part based on the corrected The color of the measurement object is measured by the light received by the light receiving sensor at the measurement time point, and the correction part is in the closed state of the opening window, based on the light that does not include the reflected light from the measurement object. The correction of the measurement time point of the light receiving sensor is performed, and the color measurement unit measures the color of the measurement object based on the light including the reflected light from the measurement object in the open state of the opening window. The color measuring device according to claim 1, wherein the rotating plates are a pair of rotating plates provided with a plurality of interference filters and through holes, and among the pair of rotating plates, one of the rotating plates is stopped and the other is rotated The plate is rotated so that the plurality of interference filters of the other rotating plate are sequentially exposed from the through hole of one of the rotating plates. The color measuring device according to claim 2, which expresses the measured value and the theoretical value of the peak value of the aforementioned spectral distribution as the pulse of the pulse motor, and the aforementioned correction unit converts the measurement time point of the aforementioned light receiving sensor from the theoretical value. The pulse of the value is corrected to the pulse of the actual measured value of the peak value of the aforementioned spectral distribution. The color measuring device according to claim 1, wherein the aforementioned light source is an LED light source. A colorimetric method, characterized by comprising: a step of irradiating light from a light source; when an opening window of an integrating sphere that can be switched between an open state that exposes a measurement object and a closed state that does not expose the measurement object is in an open state, at The light from the light source includes reflected light from the measuring object and is diffusely reflected in the integrating sphere. On the other hand, when the opening window of the integrating sphere is closed, the light from the light source does not include light from the measuring object. a step of diffusely reflecting the reflected light of the object in the aforementioned integrating sphere; and a step of splitting the light from the aforementioned integrating sphere by rotating a plurality of interference filters, The step of using the light receiving sensor to receive the light that has been split in the aforementioned plurality of interference filters; according to the spectral distribution of the aforementioned light receiving sensor, correcting the measurement time point of the aforementioned light receiving sensor from a theoretical value to a possible The step of obtaining the actual measured value of the peak value of the aforementioned spectral distribution; and the step of measuring the color of the aforementioned measuring object according to the light received by the aforementioned light-receiving sensor at the corrected measuring time point. In the aforementioned correcting step, In the closed state of the opening window, correction of the measurement time point of the light receiving sensor is performed based on the light that does not include the reflected light from the measurement object. In the step of performing the measurement, the opening window In the ON state, the color of the measurement object is measured based on the light including the reflected light from the measurement object.

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