JP2004305558A - Method for evaluating transparency of skin - Google Patents
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、肌の透明性を客観的に評価する方法に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
肌に光を照射して肌の透明性を評価する技術として、例えば、下記特許文献１に記載の技術が知られている。この技術は、筒状の遮光環の外側において肌に環状に光を照射し、遮光環内に配した光電変換素子で該遮光環内にまわり込んだ光を受光し、その受光量に基づいて肌の透明性を評価するものである。
【０００３】
ところで、この技術では、遮光環の内側に回り込んだ光に基づいて評価を行っているが、微小な光の回り込みは遮光環にさえぎられるため、その光は受光量として検出されない。このため、得られる評価は実際の肌の透明性を正確に反映したものではなかった。また、肌への密着度によっては、表面反射による光のまわり込みが加わる場合もあり、その分正確性に欠けるものであった。さらに、受光領域に戻ってきた光量しか測れないので、例えば測定値が小さくなったとき、これが光の広がり幅が小さくなったことによるのか、戻り光全体の強度の低下によるのかを区別できない。
【０００４】
【特許文献１】
特公昭６０−１４６１６号公報
【０００５】
従って、本発明は、肌の透明性を客観的に正確に評価することができる肌の透明性の評価方法を提供することにある。
【０００６】
【課題を解決するための手段】
本発明は、肌の透明性評価の対象部における第１の照射領域と該第１の照射領域を含み且つ該第１の照射領域よりも広い第２の照射領域とにそれぞれ光を照射し、該第１の照射領域及び該第２の照射領域から射出される光を受光して肌の透明性を評価する方法であって、
前記第１の照射領域及び前記第２の照射領域へのそれぞれの照射光量と該第１の照射領域及び該第２の照射領域から射出されるそれぞれの射出光量とを比較して肌の透明性を評価する肌の透明性の評価方法を提供することにより、前記目的を達成したものである。
【０００７】
【発明の実施の形態】
以下、本発明の肌の透明性の評価方法を、その好ましい実施形態に基づいて、図面を参照しながら説明する。なお以下の説明は、ＪＩＳ Ｚ８７２２での表記（照射角／受光角）でいうｄ／８°（ｄは散乱光）なる光学系に基づいて行うが、他の光学系を用いても差し支えない。
【０００８】
図１（ａ）及び（ｂ）は、本発明に使用される光学系の一実施形態における照射光及び射出光の照射・受光条件を模式的に示す図である。図１において、符号１は光源、２は受光器、３は絞り、４は積分球、Ｓは肌である。
【０００９】
図１（ａ）及び（ｂ）に示すように、本発明の肌の透明性の評価方法は、肌の透明性評価の対象部における第１の照射領域Ａ１と、第１の照射領域Ａ１を含み且つ該第１の照射領域Ａ１よりも広い第２の照射領域Ａ２とに、それぞれ光源１から光を照射し、第１の照射領域Ａ１及び第２の照射領域Ａ２から射出される光を受光器２で受光し、前記第１の照射領域Ａ１及び前記第２の照射領域Ａ２へのそれぞれの照射光量Ｉ１、Ｉ２と第１の照射領域Ａ１及び第２の照射領域Ａ２から射出されるそれぞれの射出光量Ｒ１、Ｒ２とを比較して肌の透明性を評価する。各照射領域への光の照射順は問わない。
【００１０】
照射領域を変えるときは、絞り３の開口部３０の大きさを変えるが、そのときＡ１、Ａ２は受光領域Ｒに含まれている必要がある。受光領域Ｒの中で照射領域に含まれない部分は、そこからの反射を抑えるために絞り３は低反射率である黒色の材料にしておくことが好ましい。
【００１１】
照射領域に含まれない領域からの反射を補正するためにサンプルのない（照射領域に入った光が戻ってこない）状態で受光量を測定しておき、Ｉ１、Ｉ２、Ｒ１、Ｒ２を求める際には、実測値から前記の測定値を差し引いて補正を行うことが好ましい。なお、実際の照射光量Ｉ１、Ｉ２を直接測定することができない場合には、肌の代わりに標準白色版を測定したときの受光量を、Ｉ１、Ｉ２とみなして用いることができる。これらの測定値は、前記の照射光量に比例する量となっているので、これらを用いて問題なく肌の透明性を評価することができる。
【００１２】
本発明においては、前記第１の照射領域への前記照射光量Ｉ１と該第１の照射領域からの前記射出光量Ｒ１との比（Ｒ１／Ｉ１＝α１）と、前記第２の照射領域への前記照射光量Ｉ２と該第２の照射領域からの前記射出光量Ｒ２との比（Ｒ２／Ｉ２＝α２）とを比較することが好ましい。
【００１３】
前記比α１とα２との比較は、これら比α１と比α２との比（α１／α２）や差（α２−α１）で行うが、比で行うのが好ましい。
【００１４】
前述のように比（α１／α２）で比較する場合には、該比が小さい程、特に０に近い程肌が透明であると評価する。
【００１５】
前記第１の照射領域と前記第２の照射領域との面積比（Ａ１／Ａ２）は、０．１〜０．９、特に０．２〜０．６が好ましい。該面積比を斯かる範囲とすることで、第１の照射領域の測定での受光量をある程度確保しつつ、第１の照射領域の測定と第２の照射領域の測定との受光量の差異を得ることができ、肌の透明性を客観的に正確に評価することができる。
【００１６】
前記第１の照射領域の面積は、２〜８ｍｍ２、特に３〜５ｍｍ２が好ましい。前記第２の照射領域の面積は、７〜１５ｍｍ２、特に１０〜１３ｍｍ２が好ましい。該第１及び第２の照射領域の面積を斯かる範囲とすることで、絞りを肌に密着させることができ、また受光量に対する回り込みの光の量をより正確に検出することができるので、肌の透明性を客観的に正確に評価することができる。
【００１７】
前記第２の照射領域は、前記第１の照射領域と同心であることが好ましい。
【００１８】
前記第１の照射領域及び前記第２の照射領域に照射する前記光は、測定を肌の外観に対応させるためには、可視光領域（波長３６０〜７４０ｎｍ）を含むものであれば、特に制限はないが、ダイナミックレンジをそろえるためには白色光が望ましい。また、特定の波長に着目する場合には、その波長を含む有色光でもよい。フォトクロミックな化粧品を塗布した肌を測定する等の場合は、照射する光に紫外線を含ませてもよい。
【００１９】
前記第１の照射領域及び前記第２の照射領域から射出された前記光のうち受光する該光の波長は３６０〜７４０ｎｍが好ましい。受光する該光の波長を斯かる範囲とすることで、人間が認識できるすべての波長がカバーされるので、肌の透明性を客観的により正確に評価することができる。
【００２０】
受光器のダイナミックレンジはより大きいほうが好ましい。また、照射光量は、標準白色版を測定したときに受光する光の強度が受光器のダイナミックレンジを越えない範囲で大きいことが好ましい。
【００２１】
前記第１の照射領域及び前記第２の照射領域に照射する前記光の照射条件及び前記射出光の受光条件に特に制限はないが、ＪＩＳ Ｚ ８７２２（２０００）に準拠した照射・受光条件で照射し受光することが好ましい。特に外部からの光を遮断した照射・受光条件で照射し受光することが好ましい。
【００２２】
本実施形態による肌の評価方法では、照射光に対する回り込み（前述の微小な光の回り込み）のほとんどが検出されるため、得られる評価結果は、肌の透明性を正確に反映したものである。また、該評価方法では、肌の色も測定することができ、従来法ではできなかった表面反射による光の回り込みが含まれることがなく、測定誤差のない正確な評価を行えるほか、透明性に与える肌の色の影響を取り除くことができる。
【００２３】
本発明の肌の透明性の評価方法は、素肌は勿論、各種美容クリームの使用後における肌、化粧した肌、日焼け肌等の透明性評価にも適用することができる。
【００２４】
本発明による肌の透明性の評価結果は、美容クリーム、各種化粧料（例えば、美白化粧料）、洗顔料若しくは日焼け止め等の推奨、化粧方法の推奨、美容クリーム、化粧料、洗顔料若しくは日焼け止め等の開発、又は美容クリーム、洗顔料若しくは日焼け止め等の効能の評価、タンニングの評価等に適用することができる。
【００２５】
また、本発明は、肌の測定部位に特に制限はない。顔は勿論、手足や人体の各部位の肌の透明性を評価することができる。
【００２６】
【実施例】
以下、本発明を実施例によりさらに具体的に説明する。
下記のように肌の透明性の評価を行い、得られた評価結果を、下記の目視による評価と比較した。その結果を表１に示す。
【００２７】
下記のように所定の測定条件で３人の被測定者について素顔の頬に照射領域を変えて光を照射し、各照射領域から戻ってきた射出光を受光して分光器で分光し、射出光量の分光特性を得た。そして、各照射領域について照射光量と射出光量との比α１、α２を求め、これらの比（α１／α２）を求めた。得られた（α１／α２）の分光特性を図２に示した。
【００２８】
＜測定条件＞
測定器：ミノルタ（株）製、分光測色計「ＣＭ−２６００ｄ」
照明・受光条件：ｄ／８°（ＪＩＳ Ｚ８７２２）
第１の照射領域：Ｌ１（測定径）＝１ｍｍの円形
第２の照射領域：第１の照射領域と略同心でＬ２（測定径）＝２ｍｍの円形
【００２９】
〔目視による評価〕
人の肌診断経験が豊富な人により、前記３人の被測定者について肌の透明性の判断を行い、下記のように評価した。
◎：透明感が非常によい。
○：透明感がよい。
△：透明感は普通。
【００３０】
図２に示すように、被測定者によって、前記比（α１／α２）の分光特性に高低差があることが確認された。また、表１に示すように、例えば、波長６００ｎｍにおける前記比（α１／α２）が零に近い程、目視判断では肌に透明感（目視で感じた肌の透明性）があり、本発明によれば肌の外観の一つである透明性を客観的に評価できることが確認された。
【００３１】
【表１】
【発明の効果】
本発明によれば、肌の透明性を客観的に正確に評価することができる肌の透明性の評価方法が提供される。
【図面の簡単な説明】
【図１】本発明の肌の透明性の評価方法における照射光及び射出光の照射・受光条件を模式的に示す図であり、（ａ）は第１の照射領域での照射・受光条件を示す図、（ｂ）は第２の照射領域での照射・受光条件を示す図である。
【図２】実施例によるα１／α２の分光特性を示す図である。
【符号の説明】
１ 光源
２ 受光器
３ 絞り
３０ 開口部
４ 積分球
Ａ１ 第１の照射領域
Ａ２ 第２の照射領域
Ｒ 受光領域
Ｓ 肌[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for objectively evaluating skin transparency.
[0002]
Problems to be solved by the prior art and the invention
As a technique for evaluating skin transparency by irradiating the skin with light, for example, a technique described in
[0003]
By the way, in this technique, the evaluation is performed based on the light sneaking into the inside of the light-shielding ring. However, since the small light sneak is interrupted by the light-shielding ring, the light is not detected as the received light amount. For this reason, the obtained evaluation did not accurately reflect the actual transparency of the skin. In addition, depending on the degree of adhesion to the skin, the light may be wrapped around by surface reflection, which is insufficient in accuracy. Furthermore, since only the amount of light returning to the light receiving region can be measured, it is not possible to distinguish, for example, when the measured value is small, whether this is due to a decrease in the spread width of the light or a decrease in the intensity of the entire returned light.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 60-14616 [0005]
Accordingly, an object of the present invention is to provide a skin transparency evaluation method capable of objectively and accurately evaluating skin transparency.
[0006]
[Means for Solving the Problems]
The present invention includes a first irradiation region and a second irradiation region including the first irradiation region and wider than the first irradiation region, and irradiates light to the first irradiation region in the target portion of the skin transparency evaluation, A method of receiving light emitted from the first irradiation area and the second irradiation area and evaluating the transparency of the skin,
Compare the respective irradiation light amounts to the first irradiation region and the second irradiation region with the respective irradiation light amounts emitted from the first irradiation region and the second irradiation region, and determine the transparency of the skin. The above object has been achieved by providing a method for evaluating the transparency of skin for evaluating the above.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a method for evaluating skin transparency according to the present invention will be described based on preferred embodiments with reference to the drawings. Note that the following description is based on an optical system of d / 8 ° (d is scattered light) in JIS Z8722 (irradiation angle / reception angle), but other optical systems may be used.
[0008]
FIGS. 1A and 1B are diagrams schematically showing irradiation / reception conditions of irradiation light and emission light in one embodiment of an optical system used in the present invention. In FIG. 1,
[0009]
As shown in FIGS. 1 (a) and 1 (b), the method for evaluating skin transparency according to the present invention employs a first irradiation area A1 and a first irradiation area A1 in a skin transparency evaluation target portion. A second irradiation area A2 that is larger than the first irradiation area A1 is irradiated with light from the
[0010]
When changing the irradiation area, the size of the
[0011]
In order to calculate I1, I2, R1, and R2 by measuring the amount of received light in a state where there is no sample (light that has entered the irradiated area does not return) in order to correct reflection from an area not included in the irradiated area. Preferably, the correction is performed by subtracting the measured value from the actually measured value. In the case where the actual irradiation light amounts I1 and I2 cannot be directly measured, the light reception amounts when the standard white plate is measured instead of the skin can be used as I1 and I2. Since these measured values are in proportion to the irradiation light amount, the transparency of the skin can be evaluated without any problem using them.
[0012]
In the present invention, the ratio (R1 / I1 = α1) of the irradiation light amount I1 to the first irradiation region and the emission light amount R1 from the first irradiation region, and the ratio of the irradiation light amount to the second irradiation region It is preferable to compare a ratio (R2 / I2 = α2) between the irradiation light amount I2 and the emission light amount R2 from the second irradiation region.
[0013]
The comparison between the ratios α1 and α2 is performed by the ratio (α1 / α2) or the difference (α2−α1) of the ratio α1 and the ratio α2, but is preferably performed by the ratio.
[0014]
As described above, when comparing by the ratio (α1 / α2), the smaller the ratio, the closer to 0, the more the skin is evaluated as being transparent.
[0015]
The area ratio (A1 / A2) between the first irradiation area and the second irradiation area 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 irradiated region and the measurement of the second irradiated region can be ensured to some extent while measuring the amount of received light in the first irradiated region. Can be obtained, and the transparency of the skin can be objectively and accurately evaluated.
[0016]
Area of the first illumination area, 2 to 8 mm 2, in particular 3 to 5 mm 2 is preferred. Area of the second illumination area, 7 to 15 mm 2, in particular 10～13Mm 2 is preferred. By setting the area of the first and second irradiation regions to such a range, the stop can be brought into close contact with the skin, and the amount of sneak light with respect to the received light amount can be detected more accurately. Skin transparency can be objectively and accurately evaluated.
[0017]
Preferably, the second irradiation area is concentric with the first irradiation area.
[0018]
The light applied to the first irradiation area and the second irradiation area is not particularly limited as long as it includes a visible light region (wavelength: 360 to 740 nm) in order to make the measurement correspond to the appearance of the skin. However, white light is desirable to make the dynamic range uniform. When focusing on a specific wavelength, colored light containing that wavelength may be used. In the case where the skin to which photochromic cosmetics are applied is measured, ultraviolet light may be included in the irradiation light.
[0019]
The wavelength of the light received from the light emitted from the first irradiation area and the second irradiation area is preferably 360 to 740 nm. By setting the wavelength of the light to be received in such a range, all wavelengths that can be recognized by humans are covered, so that the transparency of the skin can be objectively and more accurately evaluated.
[0020]
It is preferable that the dynamic range of the light receiver be larger. Further, it is preferable that the irradiation light amount is large as long as the intensity of light received when measuring the standard white plate does not exceed the dynamic range of the light receiving device.
[0021]
There is no particular limitation on the irradiation conditions of the light and the light receiving conditions of the emitted light to irradiate the first irradiation region and the second irradiation region, but irradiation is performed under irradiation and light receiving conditions in accordance with JIS Z 8722 (2000). It is preferable to receive light. In particular, it is preferable to irradiate and receive light under irradiation and light receiving conditions in which external light is blocked.
[0022]
In the skin evaluation method according to the present embodiment, since most of the wraparound to the irradiation light (the above-described wraparound of the minute light) is detected, the obtained evaluation result accurately reflects the transparency of the skin. In addition, the evaluation method can also measure the color of the skin, does not include the wraparound of light due to surface reflection, which was not possible with the conventional method, and can perform an accurate evaluation without measurement error, and also has a high transparency. It can remove the effect of skin color.
[0023]
The method for evaluating the transparency of the skin of the present invention can be applied to the evaluation of the transparency of not only bare skin but also skin after use of various cosmetic creams, makeup skin, tanned skin and the like.
[0024]
The evaluation results of the skin transparency according to the present invention include the recommendation of beauty cream, various cosmetics (for example, whitening cosmetic), face wash or sunscreen, the recommendation of makeup method, beauty cream, cosmetic, face wash or suntan. The present invention can be applied to the development of a stop, an evaluation of the effects of a beauty cream, a face wash or a sunscreen, an evaluation of a tanning, and the like.
[0025]
In the present invention, there is no particular limitation on the measurement site on the skin. It is possible to evaluate the transparency of the skin of each part of the limb and the human body as well as the face.
[0026]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
The skin transparency was evaluated as described below, and the obtained evaluation results were compared with the following visual evaluations. Table 1 shows the results.
[0027]
The three measurement subjects are irradiated with light by changing the irradiation area on the cheeks of the real face under the predetermined measurement conditions as described below, and the emitted light returned from each irradiation area is received, separated by a spectroscope, and emitted. The spectral characteristics of light quantity were obtained. Then, the ratios α1 and α2 of the irradiation light amount and the emission light amount for each irradiation region were obtained, and these ratios (α1 / α2) were obtained. FIG. 2 shows the obtained (α1 / α2) spectral characteristics.
[0028]
<Measurement conditions>
Measuring instrument: Minolta Co., Ltd., spectral colorimeter "CM-2600d"
Lighting / light receiving conditions: d / 8 ° (JIS Z8722)
First irradiation area: L1 (measured diameter) = 1 mm circular. Second irradiation area: substantially concentric with the first irradiated area, L2 (measured diameter) = 2 mm circular.
[Evaluation by visual inspection]
A person who has a lot of human skin diagnosis experience judged skin transparency of the three subjects and evaluated as follows.
A: Transparency is very good.
：: Transparency is good.
Δ: Transparency is normal.
[0030]
As shown in FIG. 2, the subject confirmed that the spectral characteristics of the ratio (α1 / α2) had a height difference. Further, as shown in Table 1, for example, the closer the ratio (α1 / α2) at a wavelength of 600 nm is to zero, the more transparent the skin (visually perceived transparency) is in visual judgment. According to this, it was confirmed that transparency, which is one of the appearances of the skin, can be objectively evaluated.
[0031]
[Table 1]
【The invention's effect】
According to the present invention, there is provided a skin transparency evaluation method capable of objectively and accurately evaluating skin transparency.
[Brief description of the drawings]
FIG. 1 is a diagram schematically showing irradiation / reception conditions of irradiation light and emission light in a skin transparency evaluation method of the present invention, and FIG. 1 (a) shows irradiation / reception conditions in a first irradiation region. FIG. 3B is a diagram illustrating irradiation / light receiving conditions in a second irradiation region.
FIG. 2 is a diagram illustrating spectral characteristics of α1 / α2 according to an example.
[Explanation of symbols]
REFERENCE SIGNS
Claims (4)
前記第１の照射領域及び前記第２の照射領域へのそれぞれの照射光量と該第１の照射領域及び該第２の照射領域から射出されるそれぞれの射出光量とを比較して肌の透明性を評価する肌の透明性の評価方法。Irradiating light to a first irradiation area and a second irradiation area including the first irradiation area and being wider than the first irradiation area in the target portion of the skin transparency evaluation target; A method for evaluating the transparency of the skin by receiving the irradiation light returning from the irradiation area and the second irradiation area,
Compare the respective irradiation light amounts to the first irradiation region and the second irradiation region with the respective irradiation light amounts emitted from the first irradiation region and the second irradiation region, and determine the transparency of the skin. How to evaluate skin transparency.
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| JP2003105348A JP4278419B2 (en) | 2003-04-09 | 2003-04-09 | Evaluation method of skin transparency |
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| JP2003105348A JP4278419B2 (en) | 2003-04-09 | 2003-04-09 | Evaluation method of skin transparency |
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| JP2009030381A Division JP4799628B2 (en) | 2009-02-12 | 2009-02-12 | Skin transparency evaluation device |
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