JP3783491B2 - Skin condition evaluation method and apparatus - Google Patents

Skin condition evaluation method and apparatus Download PDF

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Publication number
JP3783491B2
JP3783491B2 JP30026499A JP30026499A JP3783491B2 JP 3783491 B2 JP3783491 B2 JP 3783491B2 JP 30026499 A JP30026499 A JP 30026499A JP 30026499 A JP30026499 A JP 30026499A JP 3783491 B2 JP3783491 B2 JP 3783491B2
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Prior art keywords
skin
light
signal
blood flow
fatigue
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JP2001112742A (en
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義直 永嶋
慶一 菅田
幸博 矢田
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Kao Corp
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Kao Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、レーザー光を皮膚に入射させ、その反射光を周波数解析することにより肌の疲労度等を簡便に調べられるようにする肌状態の評価方法及びそのために使用する装置に関する。
【0002】
【従来の技術】
従来、肌の疲労度を評価する為、専門の判定者による目視又は触診による判定や、多項目にわたって肌の物性値を計測する方法が行われている。
【0003】
また、皮膚血管の緊張状態や汗腺の分泌作用に影響を与える皮膚の交感神経の興奮状態を指標として肌の疲労度を評価することも行われている。この指標の計測の為には、Microneurography法により皮膚交感神経活動や筋交感神経活動が計測される。
【0004】
【発明が解決しようとする課題】
目視あるいは触診による判定や、多項目にわたる肌の物性値の計測には、経験や専門的知識が必要であり、一般人が容易に行えるものではない。
【0005】
また、交感神経活動の計測では、皮膚の上から針電極を、皮膚や筋肉に分布する神経に刺さなくてはならず、この計測方法も一般人が容易に行えるものではない。
【0006】
そこで、本発明は、疲労度等の肌状態を一般人でも非侵襲的に簡便に評価できるようにし、その評価結果をビジュアルにわかりやすく表示することを目的とする。
【0007】
【課題を解決するための手段】
本発明者らは、マルチチャンネルレーザー組織血流計(multi-channel laser doppler tissue blood flowmeter)における皮膚の血流信号の検出機構を利用して血流信号を得、その血流信号から特定の2つ以上の周波数帯域を抽出し、それらの比をとることにより肌状態の指標が得られ、それにより肌の疲労度等を簡便に評価できることを見出し、本発明を完成させるに至った。
【0009】
即ち、本発明は、
(i)レーザー光源、
(ii)レーザー光源から発せられたレーザー光を複数の光線束に分割する光分岐器、
(iii)複数の光線束の光を同時に皮膚の複数の測定点に入射させる送光用端子と該送光用端子から皮膚に入射させた光の反射光を受光する複数の受光用端子とからなるセンサ部、
(iv)複数の受光用端子で受光された光を血流信号に変換する光検出器、
(v)複数の測定点毎に血流信号から少なくとも2つの周波数帯域の信号を抽出するバンドパスフィルター、
(vi)複数の測定点毎に、抽出した各周波数帯域の信号強度の比を出力する信号解析手段、
からなる肌の疲労度の評価装置である。
【0010】
【発明の実施の形態】
図1は、本発明の肌状態の評価装置の一態様のブロック図である。
【0011】
この装置は、レーザー光源1、レーザー光源1から発せられたレーザー光を複数の光線束に分割する光分岐器2、複数の光線束の光を同時に皮膚の複数の測定点に入射させる送光用端子3と該送光用端子3から皮膚に入射させた光の反射光を受光する複数の受光用端子4からなるセンサ部5、受光用端子4で受光された光を血流信号に変換する光検出器6、血流信号から少なくとも2つの周波数帯域の信号を抽出するバンドパスフィルター7、抽出した各周波数帯域の信号強度の比を出力する信号解析手段8からなり、信号解析手段8にはモニター9とプリンター10が接続されている。
【0012】
この装置において、レーザー光源1、光分岐器2、センサ部5及び光検出器6は、従来のマルチチャンネルレーザー組織血流計(multi-channel laser doppler tissue blood flowmeter)(特開平8−182658号公報等参照)における皮膚の血流信号の検出機構を利用することができる。ただし、センサ部5の皮膚への接触側端面においては、皮膚の複数の測定点に同時にレーザー光を入射させ、その反射光を各測定点毎に同時に検出できるようにするため、図1の破線枠に示したように、一つの送光用端子3と一つの受光用端子4からなるセンサ素子5aを多数配列したものとなっている。
【0013】
送光用端子3と受光用端子4は、より具体的には、それぞれ光分岐器2及び光検出器6に接続した光ファイバーから構成する。図1では、表記を簡単にするため、センサ部5に配列されているセンサ素子5a群の最上列のもののみを光分岐器2と光検出器6に接続してあるように表しているが、実際は全てのセンサ素子5aの送光用端子3と受光用端子4とを、それぞれ光分岐器2と光検出器6とに接続してあり、したがって光検出器6には、合計64チャンネルの受光用端子4からの光が入力される。なお、ここに図示したセンサ素子5aの個数は一例であり、特に制限はない。
【0014】
このように多数のセンサ素子5aをセンサ部5に設け、皮膚の多数の測定点において血流信号を同時に検出することにより、肌状態を2次元的な広がりをもって評価することが可能となる。
【0015】
バンドパスフィルター7は、血流信号にのっている血管の振え、心拍、神経の緊張等の情報を読み出すため、血流信号から少なくとも2つの周波数帯域の信号を抽出するものであり、組織の血流量を解析する本来のマルチチャンネルレーザー組織血流計に対して特徴的な構成となっている。
【0016】
バンドパスフィルター7では、例えば、皮膚交感神経の興奮状態と肌の疲労度に関する情報を読み出す場合、血流信号のサンプルレート1〜10Hzのときに、0.04Hz以上0.15Hz未満、より好ましくは0.06〜0.11Hzの低周波域と、0.15Hz以上の高周波域、より好ましくは0.15〜0.50Hzの高周波域を抽出する。
【0017】
信号解析手段8は、本実施態様では、パーソナルコンピュータで実現し、バンドパスフィルター7で抽出した少なくとも2つの周波数帯域の信号の比をとり、肌状態を解析する。
【0018】
例えば、上述の低周波域の信号強度(LF)と高周波域の信号強度(HF)との比(LF/HF)は、皮膚交感神経の興奮状態の指標となり、その値が大きくなるほど皮膚交感神経の興奮が高まっていることを意味する。
【0019】
また、(LF/HF)は肌の疲労度の指標となり、その値が大きくなるほど肌の疲労度が増していることを意味する。
【0020】
このようにして得られる信号の比は、自然呼吸における呼吸速度の変動や胸郭等の動きの影響を受けることがなく、信頼性の高い肌状態の指標となる。
【0021】
血流信号から特定の周波数帯域の信号を抽出した後は、高速フーリエ変換(FFT)や最大エントロピー法(MEM)によって周波数解析を行い、特定周波数帯域のパワースペクトル等を求めてもよい。
【0022】
また、信号解析手段8では、必要に応じて、血流信号から抽出した特定の周波数帯域の信号を記憶し、その記憶した信号を用いて解析を行ってもよい。
【0023】
信号解析手段8を含むコンピュータには、モニター9やプリンター10等の表示手段を接続してあり、信号解析手段8で得られた肌状態の評価結果を表示する。表示態様としては、多数の測定点の評価結果を2次元的に配列し、かつ各評価数値を濃淡等でビジュアル化すると、肌状態の把握がきわめて容易になるので好ましい。また、表示態様としては、或る時間間隔にわたって肌状態の評価結果を動画的に表してもよく、あるいは、その時間(例えば1分間)の肌状態の評価結果の平均値を静止画的に表してもよい。
【0024】
本発明の肌状態の評価方法は、上述の本発明の装置を用いて次のように行う。
【0025】
まず、従来のマルチチャンネルレーザー組織血流計で血流を測定する場合と同様に、センサー部5を皮膚にあて、多数のセンサ素子5aの各々の送光用端子3から皮膚に同時にレーザー光を照射し、その反射光を各センサー素子5aの受光用端子4で受光し、それを光検出器6で血流信号に変換する。これにより表面から2mm程度までの真皮の血流信号を得ることができる。
【0026】
測定対象とする皮膚の部位に特に制限はないが、皮膚血管の交感神経が優位に作用する部位、例えば、額や手のひら等を測定対象とすることが好ましい。
【0027】
測定時間は、サンプリング間隔等にもよるが、数分程度とすることが好ましい。これにより肌の瞬時の状態ではなく、定常的状態を評価することが可能となる。
【0028】
光検出器6で血流信号を得た後は、バンドパスフィルター7で特定の2つ以上の周波数帯域の信号を抽出し、信号解析手段8で各周波数帯域の信号強度を対比し、その結果をモニターあるいはプリンター等の表示手段に表示する。こうして、無侵襲で容易に肌状態を評価することができる。
【0029】
【実施例】
実施例1
40代の健常女性20名をA群及びB群の2群に分け、A群は、20分間のマッサージを全身に1日1回施術し、B群は、施術を行わないコントロール群とした。図1の装置(光源:半導体レーザー,波長830nm)を用いて、施術開始前と開始4週間後の口角の皮膚の血流信号を測定し、血流信号から抽出した0.06〜0.11Hzの低周波域の信号強度(LF)と、0.15〜0.50Hzの高周波域の信号強度(HF)を測定した。測定部位の肌の疲労度の指標として、LF/HF、はり指数、潤い指数、くすみ指数及びしわ指数を求めた。
【0030】
ここで、はり指数は、専門判定者5名が触診で各被験者をはりがない状態からはりがある状態を1〜10段階に区分して判定した場合の判定値を得、その平均値をはり指数とした。
【0031】
潤い指数は、専門判定者5名が触診で各被験者を潤いがない状態から潤いがある状態を1〜10段階に区分して判定した場合の判定値を得、その平均値を潤い指数とした。
【0032】
くすみ指数は、専門判定者5名が目視で各被験者をくすみがある状態からくすみがない状態を1〜10段階に区分して判定した場合の判定値を得、その平均値をくすみ指数とした。
【0033】
しわ指数は、専門判定者5名が目視で各被験者をしわがある状態からしわがない状態を1〜10段階に区分して判定した場合の判定値を得、その平均値をしわ指数とした。
【0034】
これらの結果を図2〜図7に示す。図4〜図7にはそれぞれの判定項目について、マッサージによる肌状態の改善効果が現れているが、図2及び図3からはマッサージ後にLF/HFが低下していることがわかる。したがって、LF/HFが、肌の疲労度の指標となることがわかる。
【0035】
実施例2
20代の健常女性20名をA群及びB群の2群に分け、午前6時より翌日の計測終了まで25℃、50%の温湿度環境下に順化させた。A群は、1日徹夜させ、B群は、午後10時から翌日の午前6時まで8時間の睡眠を取らせ、コントロール群とした。頬における皮膚を測定部位とし、実施例1と同様にして測定部位の肌の疲労度の指標として、LF/HF、はり指数及びくすみ指数を、1日目の午前8時と2日目の午前8時に求めた。
【0036】
これらの結果を図8〜図11に示す。図10及び図11にはそれぞれの判定項目について、徹夜による肌の疲労が現れているが、図8及び図9からは徹夜後にLF/HFが上昇していることがわかる。したがって、LF/HFが、肌の疲労度の指標となることがわかる。
【0037】
【発明の効果】
本発明の肌状態の評価方法によれば、あるいは本発明の評価装置を使用することにより、疲労度等の肌状態を一般人でも非侵襲的に簡便に評価することができ、さらにはその評価結果をビジュアル的にわかりやすく表示することが可能となる。したがって、本発明は、ケア剤等の皮膚の疲労を改善する製品の評価やコンセプトの提案等に有用なものとなる。
【図面の簡単な説明】
【図1】 本発明の装置のブロック図である。
【図2】 施術開始前の肌のLF/HFの2次元表示である。
【図3】 施術開始4週間後の肌のLF/HFの2次元表示である。
【図4】 施術開始前と開始4週間後の肌のはり指数を示す図である。
【図5】 施術開始前と開始4週間後の肌の潤い指数を示す図である。
【図6】 施術開始前と開始4週間後の肌のくすみ指数を示す図である。
【図7】 施術開始前と開始4週間後の肌のしわ指数を示す図である。
【図8】 1日目の肌のLF/HFの2次元表示である。
【図9】 2日目の肌のLF/HFの2次元表示である。
【図10】 1日目及び2日目の肌のはり指数を示す図である。
【図11】 1日目及び2日目の肌のくすみ指数を示す図である。
【符号の説明】
1 レーザー光源
2 光分岐器
3 送光用端子
4 受光用端子
5 センサ部
5a センサ素子
6 光検出器
7 バンドパスフィルター
8 信号解析手段
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a skin condition evaluation method and an apparatus used therefor, in which laser light is incident on the skin and the reflected light is subjected to frequency analysis so that the degree of fatigue of the skin can be easily checked.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to evaluate the degree of fatigue of skin, determination by visual judgment or palpation by a professional judge or a method of measuring physical property values of skin over many items has been performed.
[0003]
In addition, the degree of skin fatigue is also evaluated using as an index the skin sympathetic nerve excitability that affects the skin blood vessel tension and the sweat gland secretion. In order to measure this index, skin sympathetic nerve activity and muscle sympathetic nerve activity are measured by the microneurography method.
[0004]
[Problems to be solved by the invention]
Judgment by visual or palpation and measurement of physical property values of skin over many items require experience and specialized knowledge, and are not easily performed by ordinary people.
[0005]
Moreover, in the measurement of sympathetic nerve activity, the needle electrode must be pierced from the skin and muscle distributed over the skin, and this measurement method cannot be easily performed by ordinary people.
[0006]
Therefore, an object of the present invention is to enable a general person to easily and non-invasively evaluate a skin condition such as a degree of fatigue and to display the evaluation result visually and clearly.
[0007]
[Means for Solving the Problems]
The present inventors obtain a blood flow signal using a detection mechanism of a skin blood flow signal in a multi-channel laser doppler tissue blood flow meter, and specify a specific 2 from the blood flow signal. By extracting two or more frequency bands and taking their ratio, it was found that an index of the skin condition can be obtained, whereby the degree of fatigue of the skin can be easily evaluated, and the present invention has been completed.
[0009]
That is , the present invention
(i) laser light source,
(ii) an optical branching device that divides laser light emitted from a laser light source into a plurality of light bundles;
(iii) From a light transmitting terminal for simultaneously entering light of a plurality of light bundles into a plurality of measurement points on the skin and a plurality of light receiving terminals for receiving reflected light of light incident on the skin from the light transmitting terminal Sensor unit,
(iv) a photodetector that converts light received by a plurality of light receiving terminals into a blood flow signal;
(v) a bandpass filter that extracts a signal of at least two frequency bands from a blood flow signal for each of a plurality of measurement points;
(vi) a signal analysis means for outputting a ratio of the signal strengths of each extracted frequency band for each of a plurality of measurement points;
It is the evaluation apparatus of the fatigue degree of the skin which consists of.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram of one aspect of the skin condition evaluation apparatus of the present invention.
[0011]
This apparatus includes a laser light source 1, an optical branching device 2 that divides laser light emitted from the laser light source 1 into a plurality of light bundles, and a light transmission device that simultaneously makes light of a plurality of light bundles enter a plurality of measurement points on the skin. A sensor unit 5 including a terminal 3 and a plurality of light receiving terminals 4 for receiving reflected light of light incident on the skin from the light transmitting terminal 3, and converts light received by the light receiving terminals 4 into a blood flow signal. It comprises a photodetector 6, a band pass filter 7 that extracts a signal of at least two frequency bands from a blood flow signal, and a signal analysis means 8 that outputs a ratio of the signal strengths of the extracted frequency bands. A monitor 9 and a printer 10 are connected.
[0012]
In this apparatus, a laser light source 1, an optical splitter 2, a sensor unit 5, and a photodetector 6 are composed of a conventional multi-channel laser doppler tissue blood flow meter (Japanese Patent Laid-Open No. Hei 8-182658). Etc.) can be used. However, in order to allow laser light to be simultaneously incident on a plurality of measurement points on the skin on the contact side end face of the sensor unit 5 and to detect the reflected light at each measurement point simultaneously, the broken line in FIG. As shown in the frame, a large number of sensor elements 5a each having one light transmitting terminal 3 and one light receiving terminal 4 are arranged.
[0013]
More specifically, the light transmitting terminal 3 and the light receiving terminal 4 are constituted by optical fibers connected to the optical branching device 2 and the photodetector 6, respectively. In FIG. 1, for the sake of simplicity, only the top row of the sensor elements 5 a arranged in the sensor unit 5 is shown as being connected to the optical branching device 2 and the photodetector 6. Actually, the light transmitting terminal 3 and the light receiving terminal 4 of all the sensor elements 5a are connected to the optical branching device 2 and the photodetector 6, respectively, and therefore the photodetector 6 has a total of 64 channels. Light from the light receiving terminal 4 is input. The number of sensor elements 5a shown here is an example, and there is no particular limitation.
[0014]
Thus, by providing a large number of sensor elements 5a in the sensor unit 5 and simultaneously detecting blood flow signals at a large number of measurement points on the skin, it becomes possible to evaluate the skin state with a two-dimensional spread.
[0015]
The bandpass filter 7 extracts signals of at least two frequency bands from the blood flow signal in order to read out information such as the shaking of the blood vessel, the heartbeat, and the nerve tension on the blood flow signal. This is a characteristic configuration with respect to the original multi-channel laser tissue blood flow meter for analyzing the blood flow volume.
[0016]
In the band-pass filter 7, for example, when reading information on the skin sympathetic nerve excitement state and the degree of skin fatigue, when the blood flow signal sample rate is 1 to 10 Hz, 0.04 Hz or more and less than 0.15 Hz, more preferably A low frequency range of 0.06 to 0.11 Hz and a high frequency range of 0.15 Hz or more, more preferably, a high frequency range of 0.15 to 0.50 Hz are extracted.
[0017]
In this embodiment, the signal analysis means 8 is realized by a personal computer, takes a ratio of signals of at least two frequency bands extracted by the band pass filter 7, and analyzes the skin state.
[0018]
For example, the ratio (LF / HF) of the signal intensity (LF) in the low frequency range and the signal intensity (HF) in the high frequency range described above becomes an index of the excitement state of the skin sympathetic nerve, and as the value increases, the skin sympathetic nerve Means that the excitement is growing.
[0019]
Further, (LF / HF) is an index of the degree of skin fatigue, and means that the greater the value, the greater the degree of skin fatigue.
[0020]
The ratio of the signals obtained in this way is not affected by fluctuations in the respiration rate in natural breathing and movements of the thorax or the like, and is a reliable skin condition index.
[0021]
After extracting a signal of a specific frequency band from the blood flow signal, frequency analysis may be performed by fast Fourier transform (FFT) or maximum entropy method (MEM) to obtain a power spectrum of the specific frequency band.
[0022]
Further, the signal analysis means 8 may store a signal of a specific frequency band extracted from the blood flow signal as necessary, and perform analysis using the stored signal.
[0023]
Display means such as a monitor 9 and a printer 10 are connected to the computer including the signal analysis means 8, and the skin condition evaluation results obtained by the signal analysis means 8 are displayed. As a display mode, it is preferable that the evaluation results of a large number of measurement points are two-dimensionally arranged and each evaluation numerical value is visualized in shades or the like because the skin state can be very easily grasped. Moreover, as a display mode, the evaluation result of the skin condition may be expressed as a moving image over a certain time interval, or the average value of the evaluation result of the skin condition for that time (for example, 1 minute) is expressed as a still image. May be.
[0024]
The skin condition evaluation method of the present invention is performed as follows using the above-described apparatus of the present invention.
[0025]
First, as in the case of measuring blood flow with a conventional multi-channel laser tissue blood flow meter, the sensor unit 5 is applied to the skin, and laser light is simultaneously applied to the skin from each of the light transmitting terminals 3 of the multiple sensor elements 5a. The reflected light is received by the light receiving terminal 4 of each sensor element 5 a and converted into a blood flow signal by the photodetector 6. Thereby, a blood flow signal of the dermis from the surface to about 2 mm can be obtained.
[0026]
Although there is no particular limitation on the site of the skin to be measured, it is preferable to set the site to which the sympathetic nerve of the skin blood vessel acts preferentially, such as the forehead or the palm.
[0027]
The measurement time depends on the sampling interval and the like, but is preferably about several minutes. This makes it possible to evaluate a steady state, not an instantaneous state of the skin.
[0028]
After obtaining the blood flow signal with the photodetector 6, the band pass filter 7 extracts signals of two or more specific frequency bands, and the signal analysis means 8 compares the signal intensities of the respective frequency bands. Is displayed on a display means such as a monitor or a printer. In this way, the skin condition can be easily evaluated non-invasively.
[0029]
【Example】
Example 1
Twenty healthy women in their 40s were divided into two groups, Group A and Group B. Group A was massaged for 20 minutes once a day, and Group B was a control group in which no treatment was performed. Using the apparatus shown in FIG. 1 (light source: semiconductor laser, wavelength 830 nm), the blood flow signal of the skin at the mouth corner before the start of treatment and 4 weeks after the start was measured, and 0.06 to 0.11 Hz extracted from the blood flow signal. The signal strength (LF) of the low frequency region and the signal strength (HF) of the high frequency region of 0.15 to 0.50 Hz were measured. LF / HF, a beam index, a moisture index, a dullness index, and a wrinkle index were obtained as indices of the degree of skin fatigue at the measurement site.
[0030]
Here, the beam index obtains a determination value obtained by classifying 1 subject to 10 states from a state in which each subject has no beam by palpation by palpation, and obtains an average value. It was an index.
[0031]
The moisturizing index is obtained by determining the judgment value by classifying 1 subject to 10th stage from the state where the subject is not moistened to the subject with 5 expert judges by palpation, and the average value is used as the moistening index. .
[0032]
The dullness index is determined by classifying 1 to 10 grades from the dull state to the dullness state, and the average value is used as the dullness index. .
[0033]
The wrinkle index is a wrinkle index that is obtained when the five expert judges visually determine each subject by dividing the wrinkle-free state into a wrinkle-free state in 1 to 10 stages. .
[0034]
These results are shown in FIGS. 4 to 7 show the effect of improving the skin condition by massage for each determination item, it can be seen from FIGS. 2 and 3 that LF / HF is lowered after massage. Therefore, it can be seen that LF / HF is an index of skin fatigue.
[0035]
Example 2
Twenty healthy women in their 20s were divided into two groups, Group A and Group B, and acclimated to a temperature and humidity environment of 25 ° C. and 50% from 6 am to the end of measurement on the next day. Group A was allowed to stay overnight all day, and Group B was allowed to sleep for 8 hours from 10:00 pm to 6:00 am on the following day, and served as a control group. The skin on the cheek was used as the measurement site, and in the same manner as in Example 1, the LF / HF, the beam index, and the dullness index were used as indices for the degree of fatigue of the skin at the measurement site. It was determined at 8 o'clock.
[0036]
These results are shown in FIGS. FIGS. 10 and 11 show that the skin fatigue caused by staying up all night for each of the determination items, it can be seen from FIGS. 8 and 9 that the LF / HF has increased after staying up all night. Therefore, it can be seen that LF / HF is an index of skin fatigue.
[0037]
【The invention's effect】
According to the skin condition evaluation method of the present invention, or by using the evaluation apparatus of the present invention, the skin condition such as fatigue level can be easily and non-invasively evaluated by a general person, and further, the evaluation result Can be displayed visually and clearly. Therefore, the present invention is useful for evaluation of products that improve skin fatigue, such as care agents, and proposal of concepts.
[Brief description of the drawings]
FIG. 1 is a block diagram of an apparatus of the present invention.
FIG. 2 is a two-dimensional display of LF / HF of the skin before the start of treatment.
FIG. 3 is a two-dimensional display of LF / HF of skin 4 weeks after the start of treatment.
FIG. 4 is a diagram showing the skin elasticity index before the start of treatment and 4 weeks after the start of treatment.
FIG. 5 is a diagram showing skin moisture index before the start of treatment and 4 weeks after the start of treatment.
FIG. 6 is a diagram showing a dullness index of skin before the start of treatment and 4 weeks after the start of treatment.
FIG. 7 is a diagram showing the skin wrinkle index before and 4 weeks after the start of treatment.
FIG. 8 is a two-dimensional display of LF / HF of the skin on the first day.
FIG. 9 is a two-dimensional display of LF / HF of the skin on the second day.
FIG. 10 is a diagram showing the skin index of the skin on the first day and the second day.
FIG. 11 is a diagram showing a dullness index of the skin on the first day and the second day.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laser light source 2 Optical branching device 3 Terminal for light transmission 4 Terminal for light reception 5 Sensor part 5a Sensor element 6 Photo detector 7 Band pass filter 8 Signal analysis means

Claims (3)

(i)レーザー光源、
(ii)レーザー光源から発せられたレーザー光を複数の光線束に分割する光分岐器、
(iii)複数の光線束の光を同時に皮膚の複数の測定点に入射させる送光用端子と該送光用端子から皮膚に入射させた光の反射光を受光する複数の受光用端子とからなるセンサ部、
(iv)複数の受光用端子で受光された光を血流信号に変換する光検出器、
(v)複数の測定点毎に血流信号から少なくとも2つの周波数帯域の信号を抽出するバンドパスフィルター、
(vi)複数の測定点毎に、抽出した各周波数帯域の信号強度の比を出力する信号解析手段、
からなる肌の疲労度の評価装置。
(i) laser light source,
(ii) an optical branching device that divides laser light emitted from a laser light source into a plurality of light bundles;
(iii) From a light transmitting terminal for simultaneously entering light of a plurality of light bundles into a plurality of measurement points on the skin and a plurality of light receiving terminals for receiving reflected light of light incident on the skin from the light transmitting terminal Sensor unit,
(iv) a photodetector that converts light received by a plurality of light receiving terminals into a blood flow signal;
(v) a bandpass filter that extracts a signal of at least two frequency bands from a blood flow signal for each of a plurality of measurement points;
(vi) a signal analysis means for outputting a ratio of the signal strengths of each extracted frequency band for each of a plurality of measurement points;
An apparatus for evaluating the degree of fatigue of skin.
複数の測定点毎の信号強度の比を2次元表示する表示手段が接続されている請求項記載の肌の疲労度の評価装置。A plurality of fatigue of the evaluation device of the skin according to claim 1, wherein the ratio of the signal intensity for each measurement point display means for displaying two-dimensional connected. 光源、光分岐器、センサ部及び光検出器が、マルチチャンネルレーザー組織血流計の光源、光分岐器、センサ部及び光検出器からなる請求項又は記載の肌の疲労度の評価装置。The apparatus for evaluating the degree of skin fatigue according to claim 1 or 2 , wherein the light source, the optical branching device, the sensor unit, and the photodetector comprise a light source, an optical branching unit, a sensor unit, and a photodetector of a multichannel laser tissue blood flow meter. .
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