JP2006102365A - Evaluation method for skin transparency - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an evaluation apparatus of skin transparency objectively and highly precisely evaluating the skin transparency. <P>SOLUTION: The evaluation apparatus 1 is provided with an integrating sphere 21 having an entrance window 211, an illumination window 212 and a light receiving window 213; a light source 22 illuminating a light to an illumination area via the entrance window 211 and the illumination window 212; an optical receiver 23 receiving the emitted light returned from the illumination area via the light receiving window 213, a restrictor 24 changing the illumination area, an evaluating section 31 comparing the illumination light quantity to the illumination area by the light source 22 with the emission light quantity received by the optical receiver and evaluating the skin transparency, and an output section 33 outputting the evaluation result of the evaluating section 31. The evaluating section 31 is so provided as to compare illumination light quantities in a plurality of times of measurements of respective illumination areas changed by the restrictor 24 with the above emission light quantity. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for objectively evaluating the transparency of skin and a cosmetic coating film, and an apparatus for carrying out the method.

  As a technique for irradiating the skin with light and evaluating the transparency of the skin, for example, techniques described in Patent Document 1 and Patent Document 2 below are known. These technologies irradiate light on the skin in a ring shape outside the cylindrical light shielding ring, receive light that has entered the light shielding ring with a photoelectric conversion element disposed in the light shielding ring, and based on the amount of light received. To evaluate the transparency of the skin.

  By the way, in this technique, the evaluation is performed based on the light that wraps around the inside of the light shielding ring. However, since the minute light wraps around the light shielding ring, the light is not detected as the amount of received light. For this reason, the obtained evaluation did not accurately reflect the transparency of the actual skin. In addition, depending on the degree of adhesion to the skin, light wrapping around due to surface reflection may be added, which is inaccurate. Furthermore, since only the amount of light that has returned to the light receiving area can be measured, for example, when the measured value becomes small, it cannot be distinguished whether this is due to a decrease in the light spread width or a decrease in the intensity of the entire return light.

JP 57-9433 A JP 2002-248080 A

  An object of the present invention is to provide a method capable of objectively and accurately evaluating skin transparency.

  The present invention irradiates light to each of a first irradiation region and a second irradiation region that includes the first irradiation region and is wider than the first irradiation region in a target portion for skin transparency evaluation. Light emitted from the first irradiation region and the second irradiation region is received, respectively, and the amount of irradiation light to the first irradiation region and the second irradiation region and the first irradiation region are respectively received. And a method for evaluating the transparency of the skin by comparing the amount of emitted light of each of the emitted light received from the second irradiated region, wherein the operations of irradiating the light and receiving the emitted light are both performed. The object is achieved by providing a method for evaluating the transparency of the skin, which is alternately performed a plurality of times for the irradiation region, and the comparison between the irradiation light amount and the emitted light amount is performed for the plurality of operations. is there.

  Further, the present invention is an apparatus for carrying out the above-described skin transparency evaluation method of the present invention, comprising an integrating sphere having an incident window, an irradiation window and a light receiving window, and the incident window and the irradiation window. A light source that irradiates light to the irradiation area through the light receiving window, a light receiver that receives the emitted light returning from the irradiation area through the light receiving window, a diaphragm that changes the irradiation area, and the light source to the irradiation area. An evaluation processing unit that evaluates the transparency of the skin by comparing the irradiation light amount and the emitted light amount received by the light receiver, and an output unit that outputs an evaluation result of the evaluation processing unit, the evaluation processing unit includes: The present invention provides an apparatus for evaluating skin transparency, which compares the amount of irradiated light and the amount of emitted light in a plurality of measurements of each of the irradiated regions changed by the diaphragm.

  In addition, the present invention provides a second irradiation area that includes the first irradiation area and the first irradiation area, and is wider than the first irradiation area, in the skin that has not been made up and the skin that has been applied with the cosmetic coating film. Each of the irradiation areas is irradiated with light to receive the emitted light returning from the first irradiation area and the second irradiation area, respectively, and each of the first irradiation area and the second irradiation area is received. Of the skin without makeup and the cosmetic coating obtained by comparing the amount of irradiated light with the amount of emitted light of each of the emitted light received from the first irradiated region and the second irradiated region The present invention provides a method for evaluating the transparency of a cosmetic coating film, which evaluates the transparency of the cosmetic coating film on the basis of the transparency of the skin provided with a film.

  ADVANTAGE OF THE INVENTION According to this invention, the transparency evaluation method of the skin which can objectively evaluate the transparency of skin accurately, the apparatus for implementing this method, and the evaluation method of the transparency of a cosmetic coating film are provided. The

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

  First, the skin transparency evaluation apparatus (hereinafter also simply referred to as an evaluation apparatus) of the present invention will be described based on its preferred embodiment. FIG. 1 schematically shows an evaluation apparatus according to the present embodiment. In FIG. 1, the code | symbol 1 has shown the evaluation apparatus.

  As shown in FIG. 1, the evaluation apparatus 1 includes a measurement apparatus main body 2 and a computer system 3 connected to the measurement apparatus main body 2 via a cable 200 via an input / output interface 20.

  The measuring apparatus main body 2 includes an integrating sphere 21 having an incident window 211, an irradiation window 212, and a light receiving window 213, a light source 22 that irradiates light to an irradiation region through the incident window 211 and the irradiation window 212, and a light receiving window 213. A light receiver 23 for receiving the emitted light returning from the irradiation region, a diaphragm 24 for changing the irradiation region, and an arithmetic control unit 25.

  The integrating sphere 21 has an inner wall coated with a white diffuse reflection paint such as MgO, and light incident through the incident window 211 is diffusely reflected, and a part of the light is incident through the irradiation window 212. The light emitted from the irradiation area of the measurement target portion and returned from the irradiation area can be received by the light receiver 23 via the light receiving window 213. In the apparatus 1 according to the present embodiment, the incident window 211, the irradiation window 212, and the light receiving window 213 are d / 8 ° (d is diffused light) as expressed in JIS Z8722 (irradiation angle / light reception angle). Arranged to satisfy the emission / light reception conditions.

  The light source 22 is not particularly limited as long as it can emit light including a visible light region (wavelength 360 to 740 nm) in order to make the measurement correspond to the appearance of the skin. Those that can emit light are desirable. For example, a xenon lamp is used as the light source 22. Further, when paying attention to a specific wavelength component, a spectroscope is interposed between the light source 22 and the incident window 211 so that light of the wavelength component can be incident. When measuring the skin which applied the photochromic cosmetics etc., you may use what can light-emit the light containing an ultraviolet-ray for a light source.

  The light receiver 23 includes a spectroscopic lens, a spectroscope, and an array sensor in which a plurality of light receiving elements are arranged. The light receiver 23 splits the emitted light incident through the light receiving window 213 with the spectroscopic lens and introduces the light into the spectroscope, and outputs the value of the emitted light amount for each wavelength component of the array sensor to the arithmetic control unit 25. Output. When measurement is performed by turning on a monochromatic light such as a light emitting diode as a light source or sequentially turning on a plurality of monochromatic lights, the light receiver need not be provided with a spectroscope.

FIGS. 3A and 3B are diagrams schematically showing the irradiation / light reception conditions of the irradiation light and the emission light of the optical system in the measurement apparatus main body 2.
The diaphragm 24 changes the irradiation region by changing the size of the opening 240. The irradiation region needs to be included in the light receiving region R as described later. The portion of the light receiving region R that is not included in the irradiation region is preferably made of a black material having a low reflectivity in order to suppress reflection from the portion. The diaphragm 24 has a so-called iris diaphragm (a lens diaphragm mechanism employed in a camera or the like) that changes the irradiation area by rotating a knob as shown in FIG. It is preferable to use a slide diaphragm that slides the plate and changes the irradiation area as shown. Alternatively, the diaphragm 24 may be one that attaches and detaches a plurality of diaphragm members with different sizes of the opening 240.

  The arithmetic control unit 25 shown in FIG. 1 includes a so-called microcomputer unit, and includes an arithmetic processing unit (CPU), a main storage device, a trigger device, and a bus connecting these devices. A program is stored in the main storage device. When the arithmetic control unit 25 receives a trigger signal from the trigger device in a state where the program is activated, the arithmetic control unit 25 captures and holds the emission light amount of each wavelength output from the array sensor in the main storage device. Then, as will be described later, it functions to transmit the emitted light quantity held in accordance with a command from the computer system 3 to the main body 31 in a predetermined format.

  The computer system 3 includes a main body 31, an input device 32, and an output device 33. The input device 32 and the output device 33 are connected to the main body 31 via an interface (not shown). In the present embodiment, as will be described later, the main body 31 functions as an evaluation processing unit, and the output device 33 functions as an evaluation result output unit.

  The main body 31 includes an arithmetic processing unit (CPU), a main storage device (RAM), an auxiliary (external) storage device, an interface for connecting an input device and an output device, and a bus connecting them. In the main storage device or the auxiliary storage device, a program for taking in and evaluating the amount of emitted light from the measuring device main body 2 is stored, and when this program is activated, the main body 31 Functions as an evaluation processing unit for evaluating the transparency of the skin. In addition, in the evaluation apparatus 1 of this embodiment, when light was irradiated from the said light source by changing an irradiation area | region like the said skin for the standard white board instead of skin, it received light from each irradiation area | region. Evaluation processing is performed by regarding the received light amount (emitted light amount) of each emitted light as the irradiated light amount to each irradiation region. The measurement of the amount of emitted light for the standard white plate is preferably performed a plurality of times for each irradiation region, but may be performed once.

  That is, the arithmetic processing unit included in the main body 31 transmits the wavelength component when the irradiation area is changed according to the diaphragm 24 transmitted from the control arithmetic unit 25 of the measurement apparatus main body 2 via the input / output interface 20. The amount of emitted light R for each (λ) is associated with any irradiation region (A) and the number of times of measurement (N: how many times), and the main storage device or auxiliary memory provided in the main body 31 as R (λ, A, N). Store in the device. Then, the arithmetic processing unit compares the irradiation light amount (the emission light amount for the standard white plate) with the emission light amount in a plurality of measurements of each irradiation region changed by the diaphragm 24. Statistically processed. Here, as a specific aspect of the statistical processing, in addition to an average value of a plurality of data, a weighted average value, a median value, an average value of data excluding maximum / minimum, and the like can be cited.

  Specifically, the average Rav (λ, A1) of the emitted light amounts R (λ, A1, 1) to R (λ, A1, N) is obtained for the skin irradiation region A1 to be evaluated, and this Rav (λ, A1) is compared with the amount of emitted light Rs1 measured under the same conditions as the skin for the standard white plate, and α1av (λ) is obtained from the ratio Rav (λ, A1) / Rs1. Similarly, for the irradiation area A2, the average Rav (λ, A2) of the emitted light amounts R (λ, A2, 1) to R (λ, A2, N) is obtained, and this Rav (λ, A2) and the standard are obtained. The amount of emitted light Rs2 measured under the same conditions as the skin for a white plate is compared, and α2av (λ) is obtained from the ratio Rav (λ, A2) / Rs2. The α1av and α2av are compared as a ratio (α1av / α2av) or a difference ratio (1- (α1av / α2av)), and the result is stored in the main storage device or the auxiliary storage device, and the wavelength Each spectrogram (spectral characteristic graph) is output to the output device 33.

  Through the output result obtained by processing as described above, the arithmetic processing unit determines that the ratio (α1av / α2av) is closer to 0 or the difference ratio (1- (α1av / α2av)) is closer to 1, Outputs an evaluation that is transparent. Note that the series of statistical processing and output processing can be performed interactively on a spreadsheet of commercially available spreadsheet software.

  According to the evaluation apparatus 1 of the present embodiment, the irradiation region is changed in two stages by the diaphragm 24, the irradiation light amount and the emission light amount are alternately obtained a plurality of times for each irradiation region, and the comparison is performed by statistical processing. Thus, as will be described later, it is possible to easily and accurately evaluate the transparency of the skin excluding the influence of the skin property change.

  Next, the skin transparency evaluation method of the present invention will be described based on an embodiment using the evaluation apparatus 1 as a preferred embodiment thereof. In addition, in the embodiment using the evaluation apparatus 1, the irradiation light amount described below in the skin transparency evaluation method of the present invention is applied to the standard white plate instead of the skin as described above. In the same manner as described above, when the light is irradiated from the light source while changing the irradiation region, the amount of the received light (the amount of emitted light) received from each irradiation region. The measurement of the amount of emitted light for the standard white plate is preferably performed a plurality of times for each irradiation region, but may be performed once.

  As shown in FIGS. 3A and 3B, the skin transparency evaluation method according to the present embodiment uses the evaluation device 1 to change the irradiation area with the aperture 24, and the skin transparency. Light is emitted from the light source 22 to the first irradiation area A1 in the evaluation target portion and the second irradiation area A2 including the first irradiation area A1 and wider than the first irradiation area A1, respectively. Light emitted from the first irradiation area A1 and the second irradiation area A2 is received by the light receiver 23, and the amount of irradiation light I1 to the first irradiation area A1 and the second irradiation area A2, respectively. The transparency of the skin is evaluated by comparing I2 with the respective emitted light amounts R1 and R2 received from the first irradiation area A1 and the second irradiation area A2.

  At that time, the operation (measurement) of the irradiation of the light and the reception of the emitted light is alternately performed a plurality of times (in this embodiment, five times) for both irradiation regions, and the irradiation light amount and the emission light amount are detected in the main body 31. Comparison is performed by statistically processing the plurality of operations. The operation interval (measurement interval) performed alternately for both irradiation regions is preferably as short as possible. However, in order to complete a series of measurements before the change in the skin properties associated with the subject's psychological tension or the like, 15 seconds is required. Hereinafter, 10 seconds or less is particularly preferable. Also, the greater the number of operations (number of measurements) for both irradiation areas, the higher the accuracy, but the practicality, the degree of effect on the number of times, and the completion of a series of measurements before changes in skin properties occur. In consideration, about 3 to 10 times are preferable.

  Then, by the main body 31, the ratio α1av between the average of the irradiation light amount I1 to the first irradiation region and the average of the emission light amount R1 received from the first irradiation region for the plurality of operations. A ratio α2av between the irradiation light amount I2 to the second irradiation region and the average of the emission light amount R2 received from the second irradiation region is obtained and compared. That is, the ratio (α1av / α2av) or the difference ratio (1- (α1av / α2av)) between the ratio α1av and the ratio α2av is calculated and output to the output device 33.

  Then, based on the output result, the ratio (α1av / α2av) between the ratio α1av and the ratio α2av is compared, and the closer the ratio is to 0, or the difference ratio (1- (α1av / α2av)) is 1. The closer you are, the better your skin will be.

  In order to correct reflection from an area that is not included in the irradiation area, when the amount of received light is measured without a sample (the light that has entered the irradiation area does not return), I1, I2, R1, and R2 are obtained. It is preferable to perform correction by subtracting the measured value from the actually measured value.

  The area ratio (A1 / A2) between the first irradiation region and the second irradiation region is preferably 0.1 to 0.9, particularly preferably 0.2 to 0.6. By setting the area ratio in such a range, the difference in the amount of received light between the measurement of the first irradiation region and the measurement of the second irradiation region while securing a certain amount of light reception in the measurement of the first irradiation region. And the transparency of the skin can be objectively and accurately evaluated.

Area of the first irradiation region, 1 to 10 mm ^2, in particular 2 to 8 mm ² is preferred. The area of the second irradiation region is preferably ³ to ²⁰ mm2, particularly 5 to 15 mm2. By setting the areas of the first and second irradiation regions in such a range, the diaphragm 24 can be brought into close contact with the skin, and the amount of wraparound light with respect to the amount of received light can be detected more accurately. The transparency of the skin can be objectively and accurately evaluated.
In addition, although the shape of each irradiation area | region is preferable substantially circular shape, it can design with an ellipse, a rectangle, a square, a rhombus etc. in addition. In the case of a circle, the diameter of the first irradiation region is preferably 1 to 4 mm, particularly preferably 1 to 3 mm. The diameter of the second irradiation region is preferably 1.5 to 6 mm, particularly preferably 2 to 5 mm.

  The second irradiation region preferably includes the entire first irradiation region, but may partially include the second irradiation region as long as the effects of the present invention are not impaired. The second irradiation area is preferably concentric with the first irradiation area.

  As described above, the light applied to the first irradiation region and the second irradiation region includes a visible light region (wavelength 360 to 740 nm) in order to make the measurement correspond to the appearance of the skin. If there is no particular limitation, white light is desirable in order to achieve a dynamic range. Further, when focusing on a specific wavelength, light including that wavelength may be used. Moreover, in the case of measuring the skin which applied the photochromic cosmetics etc., you may include ultraviolet rays in the light to irradiate.

  Of the light emitted from the first irradiation region and the second irradiation region, the wavelength of the received light is preferably 360 to 740 nm. By setting the wavelength of the received light within such a range, all wavelengths that can be recognized by human beings are covered, so that the transparency of the skin can be objectively evaluated. In order to reduce the size and cost, the light source can be a light emitting diode and the light receiver can be monochrome.

  It is preferable that the dynamic range of the light receiver is larger. Moreover, it is preferable that the irradiation light quantity is large in the range where the intensity of light received when measuring a standard white plate does not exceed the dynamic range of the light receiver.

  In the skin transparency evaluation method according to this embodiment, most of the wraparound to the irradiation light (the wraparound of the minute light described above) is detected, and thus the obtained evaluation result more accurately reflects the skin transparency. Is. In addition, the evaluation method can measure the skin color, and can perform accurate evaluation without measurement error without including light wraparound due to surface reflection, which was not possible with the conventional method. The effect of skin color can be removed. In addition, since the measurement is alternately performed a plurality of times for each region by changing the irradiation region, it is possible to remove the influence due to the change in the skin property during the measurement and to perform highly accurate evaluation.

  Next, the method for evaluating the transparency of the cosmetic coating film of the present invention (hereinafter, also simply referred to as “evaluation method”) is used as the preferred embodiment, and the method for evaluating the transparency of the skin using the aforementioned device 1 is used. It demonstrates based on a form. In addition, in the embodiment using the evaluation apparatus 1, the irradiation light amount described below in the method for evaluating the transparency of the decorative coating film of the invention is the same as described above, with the standard white plate instead of the skin as the target. Similarly to the skin, when the light is irradiated from the light source while changing the irradiation region, the amount of light received from each irradiation region (the amount of emitted light). The measurement of the amount of emitted light for the standard white plate is preferably performed a plurality of times for each irradiation region, but may be performed once.

  The evaluation method of this embodiment performs the evaluation of the transparency of the skin of the above-described embodiment on the skin that has not been made up and the skin that has been applied with the cosmetic coating film, and compared the evaluation of the obtained transparency. The transparency of the decorative coating film is evaluated.

  That is, the evaluation apparatus 1 is used to include the first irradiation region and the first irradiation region A1 on the skin that has not been made up and the skin that has been applied with the makeup coating, and from the first irradiation region A1. The second irradiation area A2 is also irradiated with light from the light source 22, and the light emitted from the first irradiation area A1 and the second irradiation area A2 is received by the light receiver 23, respectively. The amount of emitted light R1 of each of the emitted light received from the first irradiated region A1 and the second irradiated region A2 and the amount of irradiated light I1 and I2 to the first irradiated region A1 and the second irradiated region A2, respectively. The transparency of the cosmetic coating film is evaluated on the basis of the transparency of the skin that is not applied and the transparency of the skin that has been applied with the cosmetic coating film, which is obtained by comparing with R2.

  At that time, similarly to the embodiment, the operation (measurement) of the irradiation of the light and the reception of the emitted light is alternately performed a plurality of times (in this embodiment, five times) for the both irradiation regions. The comparison between the irradiation light quantity and the emission light quantity is performed by statistically processing the plurality of operations.

  And by the main body 31, the average of the irradiation light amount I1 to the first irradiation region for the plurality of operations for each measurement target site of the skin that has not been made up and the skin that has been applied with the makeup coating film The ratio α1av of the emitted light received from the first irradiation area to the average of the emitted light quantity R1, the average of the irradiation light quantity I2 to the second irradiation area, and the received from the second irradiation area. A ratio α2av with the average of the emitted light amount R2 of the emitted light is obtained and compared. That is, the ratio (α1av / α2av) or the difference ratio (1- (α1av / α2av)) between the ratio α1av and the ratio α2av is calculated by the calculation processing unit and output to the output device 33 as a spectrogram of each wavelength. Let

  Then, based on the output result, the ratio of the ratio α1av to the ratio α2av (α1av / α2av) or the difference ratio (1− (α1av / α2av)) obtained for the skin without makeup is obtained. The closer the transparency of the skin to which the cosmetic coating film is applied to the transparency, the more the cosmetic coating film is evaluated to be transparent.

  As described above, the method for evaluating the transparency of the cosmetic coating film of the present embodiment is based on the transparency of the skin from which the influence due to the change in the properties of the skin is removed, and is evaluated by the cosmetic coating film applied to the actual skin. Therefore, an objective, highly accurate and practical evaluation can be obtained.

The present invention is not limited to the embodiment.
There are no particular restrictions on the irradiation conditions of the light and the light receiving conditions of the emitted light that irradiate the first irradiation area and the second irradiation area, and the emission / light receiving conditions of the optical system of d / 8 ° according to the embodiment. In addition, it is preferable if the irradiation and reception conditions are in accordance with JIS Z 8722 (2000). In particular, it is preferable to irradiate and receive light under irradiation / light reception conditions that block external light.

Moreover, in the said embodiment, when light is irradiated from the said light source by changing an irradiation area | region similarly to this skin and making a standard white board into object for all, each emission received from each irradiation area | region The amount of light received (emission light quantity) is used as the irradiation light quantity, but when using a value obtained by directly measuring the irradiation light quantity applied to the skin, compare the irradiation light quantity with the emitted light quantity by the processing unit of the main unit. The statistical processing of the comparison when performing the evaluation based on, for example, is performed as follows.
That is, for the measurement of the irradiation area A1, the average Iav (λ, A1) of the irradiation light amounts I (λ, A1, 1) to I (λ, A1, N) and the emission light amounts R (λ, A1, 1) to R ( The average Rav (λ, A1) of λ, A1, N) is obtained, and α1av (λ) is obtained from the ratio Rav (λ, A1) / Iav (λ, A1). N in calculating Iav (λ) and Rav (λ) may be the same or different. Similarly, for the measurement of the irradiation area A2, the average Iav (λ, A2) and R (λ, A2, 1) to R (λ, A2) of I (λ, A2, 1) to I (λ, A2, N) are similarly applied. , N) is obtained, and α1av (λ) is obtained from the ratio Rav (λ, A2) / Iav (λ, A2). Also in this case, N in calculating Iav (λ) and Rav (λ) may be the same or different. Then, α1av and α2av are compared as a ratio or a difference ratio.

  In the embodiment, the measurement value from the apparatus main body is processed by a separate computer system. However, the output apparatus is attached to the apparatus main body, and the evaluation process in the computer system is provided in the microcomputer unit provided in the apparatus main body. Can also be performed.

  The skin transparency evaluation method and apparatus of the present invention can be applied not only to the bare skin, but also to the transparency evaluation of skin after use of various basic cosmetics, skin subjected to makeup cosmetics, tanned skin, etc. it can.

  The skin transparency evaluation method of the present invention is applicable to various basic cosmetics, makeup cosmetics, face wash or sunscreen recommendations, development, efficacy evaluation, tanning evaluation, makeup method recommendations, etc. can do.

  The method for evaluating a cosmetic coating film of the present invention can also be applied to the evaluation of the transparency of cosmetic coating films such as foundations, eye shadows, lipsticks, white powder (white), blusher, concealer, body cream, nail polish, pedicure and the like. .

  In the present invention, there is no particular limitation on the skin measurement site. In addition to the face (including lips), the transparency of the skin of each part of the limbs (including nails) and the human body can be evaluated.

  Hereinafter, the present invention will be described more specifically with reference to examples. In addition, this invention is not restrict | limited to a present Example at all.

[Example 1]
<Evaluation of skin transparency>
The following apparatus main body was used, and the amount of emitted light was measured alternately five times for each of the standard white plate and the following measurement object while changing the irradiation area as described below. Next, in a commercially available personal computer system connected to the apparatus main body, the color management software “CM-S9w” for the spectral colorimeter CM series is started, and the measured emission light amount is transferred from the measuring apparatus to the computer system in the CSV format. I took it in. Then, after statistically processing these emitted light amounts on a commercially available spreadsheet (“Excel” manufactured by Microsoft Corporation in the United States), the difference ratio (1-α1av / α2av) is obtained as described above, A spectrogram was output as the transparency of. The results are shown in FIG.

<Measurement conditions>
Main unit: manufactured by Minolta Co., Ltd., spectral colorimeter “CM-2600d”
Irradiation / light reception conditions: d / 8 ° (JIS Z8722)
First irradiation region: L1 (measurement diameter: diameter) = 2 mm circle Second irradiation region: substantially concentric with the first irradiation region and L2 (measurement diameter: diameter) = 4 mm circle Measurement: alternately for each region Five measurements were performed three times.
Interval of each measurement: about 10 seconds Evaluation target: Forearm inside of one person to be measured

[Comparative Example 1]
Evaluation was performed in the same manner as in Example 1 except that the measurement was not performed alternately and the irradiation region was continuously performed five times. The results are shown in FIG.

  As is apparent from the results of FIGS. 4 and 5, in the evaluation results of Example 1, the spectral characteristics of the skin transparency are almost the same in the three evaluations, whereas the evaluation of Comparative Example 1 As a result, it was found that there was a shift in spectral characteristics at every evaluation, and that the method of the present invention enables objective and highly accurate evaluation of skin transparency.

[Example 2]
<Evaluation of transparency of cosmetic coating film>
Using the apparatus of Example 1, skin transparency was examined in the same manner as in Example 1 with respect to skin that had not been made up and skin that was provided with a cosmetic coating film (commercial powder foundation and pearl pigment). The results are shown in FIG.

[Comparative Example 2]
For skin not having makeup similar to that of Example 2 and skin having a cosmetic coating film (commercially available powder foundation), color measurement that is normally performed was performed, and the spectrogram was output. The results are shown in FIG.

  As shown in FIG. 7, in the spectral characteristics based on the reflectance of the comparative example, the spectral characteristics are substantially the same regardless of the presence or absence of cosmetics. On the other hand, as shown in FIG. 6, in the evaluation of the transparency of the examples, the spectral characteristics greatly differ depending on the presence or absence of the cosmetics. By comparing the spectral characteristics, the transparency of the cosmetics is compared. It was found that sex evaluation can be performed quantitatively and with high accuracy. From this result, for example, by changing the composition of cosmetics so that the difference from the spectral characteristics of skin without makeup is reduced, the development of highly transparent cosmetics suitable for the skin can be shortened. Can be done between.

  ADVANTAGE OF THE INVENTION According to this invention, the method and apparatus which can evaluate the transparency of skin objectively and accurately and the method which can evaluate the transparency of a cosmetic coating film objectively and accurately are provided.

It is a figure which shows typically one Embodiment of the evaluation apparatus of the transparency of the skin of this invention. It is a figure which shows typically the mechanism of the aperture | diaphragm | restriction in the skin transparency evaluation apparatus of this invention, (a) is a figure which shows an iris diaphragm, (b) is a figure which shows a slide type aperture_diaphragm | restriction. It is a figure which shows typically irradiation / light-receiving conditions of the irradiation light and emission light in the skin transparency evaluation apparatus of this invention, (a) is a figure which shows the irradiation / light-receiving conditions in a 1st irradiation area | region, ( b) is a diagram showing irradiation / light reception conditions in the second irradiation region. It is a figure which shows the spectral characteristic of the transparency of the skin by Example 1. FIG. It is a figure which shows the spectral characteristic of the transparency of the skin by the case of comparative example P2004-0494JP00. It is a figure which shows the spectral characteristic of transparency of the decorative coating film by Example 2. FIG. It is a figure which shows the spectral characteristic of transparency of the decorative coating film by the comparative example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Skin transparency evaluation apparatus 2 Measuring apparatus main body 21 Integrating sphere 22 Light source 23 Light receiver 24 Aperture 3 Computer system 31 Main body (evaluation processing section)
33 Output device

Claims (7)

The first irradiation region and the second irradiation region including the first irradiation region and wider than the first irradiation region in the target portion for skin transparency evaluation are respectively irradiated with the first irradiation region. Receiving emitted light returning from the irradiation region and the second irradiation region,
The amount of light emitted to each of the first irradiation region and the second irradiation region is compared with the amount of light emitted from each of the emitted light received from the first irradiation region and the second irradiation region. A method for evaluating the transparency of
The operation of irradiating the light and receiving the emitted light is alternately performed a plurality of times for both irradiation regions, and the comparison of the irradiation light amount and the emitted light amount is performed for each of the plurality of operations. Evaluation methods.   For the plurality of operations, the ratio (R1 / I1 = α1) of the ratio of the irradiation light amount I1 to the first irradiation region and the emission light amount R1 from the first irradiation region, and the second The skin transparency evaluation method according to claim 1, wherein an average of a ratio (R2 / I2 = α2) of the amount of irradiation light I2 to the irradiation region and the amount of light emission R2 from the second irradiation region is compared. . An integrating sphere having an incident window, an irradiation window, and a light receiving window; a light source that irradiates light to the irradiation area through the incident window and the irradiation window; and an emitted light that returns from the irradiation area through the light receiving window. An evaluation processing unit that evaluates the transparency of the skin by comparing the light amount received by the light source, the diaphragm that changes the irradiation region, the amount of light irradiated to the irradiation region by the light source and the amount of light emitted by the light receiver, An output unit for outputting the evaluation result of the evaluation processing unit,
The evaluation processing unit is a skin transparency evaluation device that compares the amount of irradiated light and the amount of emitted light in a plurality of measurements of each of the irradiated regions changed by the diaphragm.   4. The skin transparency evaluation apparatus according to claim 3, wherein the diaphragm is provided so as to change the irradiation area by expanding and contracting the irradiation window. Light is applied to the first irradiation region and the second irradiation region that includes the first irradiation region and is wider than the first irradiation region in the skin that has not been made up and the skin that has been applied with the makeup coating film. , Respectively, to receive the emitted light returning from the first irradiation area and the second irradiation area,
Obtained by comparing the respective irradiation light amounts to the first irradiation region and the second irradiation region and the emission light amounts of the respective emitted lights received from the first irradiation region and the second irradiation region. A method for evaluating the transparency of a cosmetic coating film, wherein the transparency of the cosmetic coating film is evaluated based on the transparency of the skin that is not being made and the transparency of the skin that has been subjected to the cosmetic coating film.   The operation of irradiating the light and receiving the emitted light is alternately performed a plurality of times for the both irradiation regions, and the comparison between the irradiated light amount and the emitted light amount is performed for the plurality of operations. A method for evaluating the transparency of a decorative coating film. For the plurality of operations, the ratio (R1 / I1 = α1) of the ratio of the irradiation light amount I1 to the first irradiation region and the emission light amount R1 from the first irradiation region, and the second A comparison of the average of the ratio (R2 / I2 = α2) of the amount of emitted light I2 to the irradiated region and the amount of emitted light R2 from the second irradiated region is as follows. Evaluation methods.

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