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JP2005040261A - Pulse wave sensor - Google Patents

Pulse wave sensor Download PDF

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Publication number
JP2005040261A
JP2005040261A JP2003201849A JP2003201849A JP2005040261A JP 2005040261 A JP2005040261 A JP 2005040261A JP 2003201849 A JP2003201849 A JP 2003201849A JP 2003201849 A JP2003201849 A JP 2003201849A JP 2005040261 A JP2005040261 A JP 2005040261A
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JP
Japan
Prior art keywords
light
light receiving
light emitting
pulse wave
receiving element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2003201849A
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Japanese (ja)
Inventor
Kazuhiro Numaga
一寛 沼賀
Nobuyuki Aizawa
伸幸 相澤
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WAATEKKUSU KK
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WAATEKKUSU KK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to JP2003201849A priority Critical patent/JP2005040261A/en
Publication of JP2005040261A publication Critical patent/JP2005040261A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the sensitivity of a pulse wave sensor and the precision in detecting pulse waves by preventing unnecessary incoming light to a light receiving element. <P>SOLUTION: The pulse wave sensor 20 is structured so that a light emitting face 21s of a light emitting element 21 and a light receiving face 22s of a light receiving element 22 constituting the pulse wave sensor 20 are made to project to the face of a sensor housing 23 abutting to a wrist 10 and the light emitting face 21s and the light receiving face 22s are pressed on the wrist 10. The part of the pulse wave sensor excluding the light emitting face 21s and the light receiving face 22s is covered with a shell support member 29, and the rear sides of the light emitting element 21 and the light receiving element 22 are further coated with an enclosed adhesive 28 with light shading property, so that unnecessary light from the outside of the sensor will not come into the light emitting element 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、被験者の手首の動脈に赤外線領域の波長を有する光を照射し、上記動脈内の赤血球で反射された反射光から、上記被験者の脈波を検出する脈波センサに関するものである。
【０００２】
【従来の技術】
脈拍数の計測には、通常、血管のある部位に赤外線あるいは近赤外領域の光を照射し、その反射光あるいは透過光から、上記被験者の脈波を検出する光学式の脈波センサが多く用いられている。
図２（ａ），（ｂ）は手首１０に装着し、手首１０の動脈中の赤血球の動きを検出して被験者の脈波を計測する従来の脈波センサ２０Ａを示す図で、この脈波センサ２０Ａは、発光素子２１と受光素子２２とをセンサケース２３に収納したもので、上記発光素子２１と受光素子２２の裏面側は半透明の封入接着剤２４により上記センサケース２３に固着されており、上記発光素子２１の発光面２１ｓ及び受光素子２２の受光面２２ｓの外側（手首１０側）には透明なアクリル板２５が設けられている（例えば、特許文献１参照）。
上記発光素子２１や受光素子２２は、図示しない発光チップや受光チップを樹脂等の光学系外包器で被覆したもので、上記発光チップや受光チップはそれぞれの光学系外包器の基台部２１ａ，２２ａに埋設されており、上記基台部２１ａ，２２ａから突出する導光部２１ｂ，２２ｂの先端部がそれぞれ発光素子２１の発光面２１ｓ及び受光素子２２の受光面２２ｓとなる。
被験者は、上記脈波センサ２０Ａを、上記発光面２１ｓと受光面２２ｓがそれぞれ手首１０の図示しない動脈の直上近傍に位置するように、手首１０の内側にベルト３０にて装着して脈波を検出する。なお、被験者の脈拍数は、上記検出された脈波の振動数を計数して算出することができる。
なお、上記特許文献１では、受光素子２２は発光素子２１を中心にして同心円状に対称に配置された構成となっているが、発光素子２１と受光素子２２の個数及び配置は、それぞれの脈波センサで異なるので、図２では発光素子２１と受光素子２２をそれぞれ１個ずつ配置した例を示した。
【０００３】
また、上記脈波センサ２０Ａでは、受光素子２２の導光部２２ｂを手首１０側に開口する遮光チューブ２６で覆うとともに、上記発光素子２１や受光素子２２の手首１０側の外周部に、上記発光素子２１及び受光素子２２の手首１０側を支持する遮光性の外装兼素子支持部材２７を配置して、センサ外部からの光や上記発光素子２１から近赤外光が受光素子２２に入光しないようにしている。
【０００４】
【特許文献１】
特開２００２−３６０５３０号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、上記従来の脈波センサ２０Ａでは、発光素子２１と受光素子２２との間にアクリル板２５が介在していることから、その透過損失や散乱光の影響により、センサ感度が低下してしまうといった問題があった。
また、上記受光素子２２の導光部２２ｂは、遮光チューブ２６や外装兼素子支持部材２７により覆われてはいるものの、光学系外包器を構成する樹脂は透過性を有するため、上記アクリル板２５や上記半透明の封入接着剤２４を介して不要な光が受光素子２２に入光してしまうといった問題があった。
【０００６】
本発明は、従来の問題点に鑑みてなされたもので、脈波センサの感度を向上させるとともに、受光素子への不要な入光をなくして脈波の検出精度を向上させることを目的とする。
【０００７】
【課題を解決するための手段】
本発明の請求項１に記載の発明は、一対の発光素子と受光素子とを備え、被験者の手首の動脈から反射された発光素子からの反射光を受光素子で検出して、上記被験者の脈波を検出する脈波センサであって、上記発光素子の発光面と受光素子の受光面とをセンサケースの手首に当接する面に露出させたことを特徴とするものである。これにより、発光素子及び受光素子が直接手首に当たるので、発光素子からの光が損失なく手首に注入されるとともに、受光素子には手首からの光のみが入光されるので、センサ感度を向上させることが可能となる。
また、アクリル板等の透明板がないので、透明板による散乱に起因する外乱光が受光素子に入光しないので、脈波の検出精度も向上する。
請求項２に記載の発明は、請求項１に記載の脈波センサにおいて、上記発光素子の先端部と受光素子の先端部とを手首側に突出させることにより、上記発光面及び受光面を手首の血管に近づけるようにしたもので、これにより、センサ感度を更に向上させることが可能となる。
【０００８】
また、請求項３に記載の発明は、請求項１または請求項２に記載の脈波センサにおいて、上記発光素子の発光面と受光素子の受光面とを除く箇所を、遮光性を有する部材で覆ったことを特徴とするもので、これにより、受光素子への不要な入光をなくして脈波の検出精度を向上させることが可能となる。
請求項４に記載の発明は、請求項３に記載の脈波センサにおいて、上記発光素子と受光素子の手首側の外周部を、直接遮光性を有する外装支持部材で被覆したことを特徴とするもので、これにより、遮光チューブを用いることなく遮光性を確保することが可能となる。
請求項５に記載の発明は、請求項３または請求項４に記載の脈波センサにおいて、上記発光素子と受光素子とをセンサケースに封入するための封入接着剤として、遮光性を有する接着剤を用いたことを特徴とするもので、これにより、封入接着剤を介した受光素子への不要な入光をなくすことが可能となる。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態について、図面に基づき説明する。
なお、従来例と部分については同一符号を付し、その説明を省略する。
図１（ａ），（ｂ）は、本発明の実施の形態に係る脈波センサ２０の概略構成を示す図で、２１は発光素子、２２は受光素子、２３はセンサケース、２８は上記発光素子２１と受光素子２２を上記センサケース２３に封入するための封入接着剤で、本例では、上記封入接着剤２８として、例えば、黒色の接着剤などの遮光性を有する接着剤を用いている。また、２９は上記発光素子２１と受光素子２２の導光部２１ｂ，２２ｂの外周部を被覆する外装支持部材で、この外装支持部材２９は遮光性を有する樹脂あるいは接着剤から構成されている。
本例の脈波センサ２０では、発光素子２１の先端部である発光面２１ｓと受光素子２２の先端部である受光面２２ｓとをセンサケース２３の手首１０に当接する面から突出させるとともに、上記発光面２１ｓと受光面２２ｓとをセンサ外部に露出させ、この若干突出された発光素子２１と受光素子２２の先端部の周囲、すなわち、上記発光面２１ｓと上記受光面２２ｓを除く部分を上記外装支持部材２９で被覆するようにしている。したがって、上記脈波センサ２０の手首１０に当接する面は、上記発光面２１ｓと上記受光面２２ｓ及びその周辺の外装支持部材２９がやや盛り上がった面となり、上記脈波センサ２０を手首１０に装着した場合には、上記発光面２１ｓと受光面２２ｓとは皮膚に圧接され、かつ、その周りが遮光材（外装支持部材２９）で囲まれた構成となる。
【００１０】
このような構成の脈波センサ２０を手首１０に当接させると、発光素子２１の発光面２１ｓが直接手首１０に当接し、かつ、皮膚に圧接されるため、従来のような透過損失がなく、発光素子２１から手首１０方向へ照射された近赤外線は全てが手首１０に注入されるので、発光素子２１からの近赤外光を効率的に利用することができる。
上記発光素子２１から手首１０方向へ照射された近赤外線は、手首１０の図示しない動脈を流れる赤血球により反射され受光素子２２に入光する。
本例では、受光素子２２の受光面２２ｓが直接手首１０に当接しており、このため、透明板等による透過損失がないので、センサ感度が向上するとともに、上記透明板等の散乱に起因する外乱光が受光素子に入光しないので、脈波の検出精度についても向上させることができる。このとき、上記発光面２１ｓと受光面２２ｓとは皮膚に圧接されているため、近赤外線の光路が短いので、発光面２１ｓと受光面２２ｓとを単に手首１０に当接した場合に比べてセンサ感度が格段に向上する。
また、上記受光面２２ｓの周囲は遮光性を有する材料から成る外装支持部材２９で被覆し、センサ外部からの不要な光が受光素子２２に入光しないようにしたので、遮光チューブを用いることなく十分な遮光性を確保することができる。更に、上記発光素子２１と受光素子２２の裏面側は遮光性を有する封入接着剤２８により被覆されているので、上記受光素子２２の裏面側についても十分な遮光性を確保することができる。
【００１１】
このように、本実施の形態によれば、脈波センサ２０を構成する発光素子２１の発光面２１ｓと受光素子２２の受光面２２ｓとをセンサケース２３の手首１０に当接する面に突出させ、上記発光面２１ｓと上記受光面２２ｓが手首１０の皮膚に圧接するようにしたので、発光素子２１から近赤外線を効率よく手首１０に注入することができるとともに、受光素子２２の受光面２２ｓには直接手首１０からの反射光が入光するので、センサ感度を大幅に向上させることができる。また、上記発光面２１ｓと上記受光面２２ｓを除く部分を上記外装支持部材２９で被覆し、更に、上記発光素子２１と受光素子２２の裏面側を遮光性を有する封入接着剤２８により被覆して、センサ外部からの不要な光が受光素子２２に入光しないようにしたので、脈波の検出精度を向上させることができる。
【００１２】
なお、上記実施の形態では、発光素子２１と受光素子２２をそれぞれ１個ずつ配置して成る脈波センサ２０について説明したが、本発明は、例えば、上記特許文献１に開示された受光素子２２が発光素子２１を中心にして同心円状に対称に配置された構成の脈波センサ２０Ａなどの他の脈波センサにも適用可能である。
また、本発明の発光素子２１の発光面２１ｓと受光素子２２の受光面２２ｓとをセンサケース２３の手首１０に当接する面に露出させる構成は、図２（ａ）に示したような円盤状のセンサケース２３に限らず、種々の形態のセンサケースにおいても実現できることはいうまでもない。
【００１３】
【発明の効果】
以上説明したように、脈波センサの発光素子の発光面と受光素子の受光面とをセンサケースの手首に当接する面に露出させて、発光素子及び受光素子が直接手首に当たるようにしたので、透過損失を大幅に低減することができ、センサ感度を向上させることができるとともに、不要な光が受光素子に入光しないので、脈波の検出精度についても向上させることができる。
また、上記発光素子の先端側と受光素子の先端側とを手首側に突出させるとともに、上記発光面と受光面とを除く箇所を、遮光性を有する部材で覆うようにしたので、受光素子への不要な入光を低減することができ脈波の検出精度を向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る脈波センサの構成を示す図である。
【図２】従来の脈波センサの構成を示す図である。
【符号の説明】
１０ 手首、２０ 脈波センサ、２１ 発光素子、２２ 受光素子、
２３ センサケース、２８ 封入接着剤、２９ 外装支持部材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulse wave sensor that irradiates a wrist artery of a subject with light having a wavelength in the infrared region and detects the pulse wave of the subject from reflected light reflected by red blood cells in the artery.
[0002]
[Prior art]
For measuring the pulse rate, there are usually many optical pulse wave sensors that irradiate a part of the blood vessel with infrared or near infrared light and detect the pulse wave of the subject from the reflected or transmitted light. It is used.
2A and 2B are diagrams showing a conventional pulse wave sensor 20A that is mounted on the wrist 10 and detects the pulse wave of the subject by detecting the movement of red blood cells in the artery of the wrist 10, and this pulse wave. The sensor 20A has a light emitting element 21 and a light receiving element 22 housed in a sensor case 23, and the back sides of the light emitting element 21 and the light receiving element 22 are fixed to the sensor case 23 by a translucent sealing adhesive 24. A transparent acrylic plate 25 is provided outside the light emitting surface 21s of the light emitting element 21 and the light receiving surface 22s of the light receiving element 22 (on the wrist 10 side) (see, for example, Patent Document 1).
The light-emitting element 21 and the light-receiving element 22 are obtained by coating a light-emitting chip and a light-receiving chip (not shown) with an optical system envelope such as a resin, and the light-emitting chip and the light-receiving chip are each a base portion 21a of each optical system envelope. The tip portions of the light guide portions 21b and 22b protruding from the base portions 21a and 22a serve as the light emitting surface 21s of the light emitting element 21 and the light receiving surface 22s of the light receiving element 22, respectively.
The subject wears the pulse wave sensor 20 </ b> A with the belt 30 on the inner side of the wrist 10 so that the light emitting surface 21 s and the light receiving surface 22 s are located in the vicinity of an artery (not shown) of the wrist 10. To detect. Note that the pulse rate of the subject can be calculated by counting the frequency of the detected pulse wave.
In Patent Document 1, the light receiving elements 22 are concentrically arranged symmetrically around the light emitting element 21. However, the number and arrangement of the light emitting elements 21 and the light receiving elements 22 are different from each other. Since each wave sensor is different, FIG. 2 shows an example in which one light emitting element 21 and one light receiving element 22 are arranged.
[0003]
Further, in the pulse wave sensor 20A, the light guide portion 22b of the light receiving element 22 is covered with a light shielding tube 26 that opens to the wrist 10 side, and the light emitting element 21 and the light emitting element 22 have the light emission on the outer peripheral portion on the wrist 10 side. A light-shielding exterior / element support member 27 that supports the wrist 10 side of the element 21 and the light receiving element 22 is arranged so that light from the outside of the sensor or near infrared light from the light emitting element 21 does not enter the light receiving element 22. I am doing so.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-360530
[Problems to be solved by the invention]
However, in the conventional pulse wave sensor 20A, since the acrylic plate 25 is interposed between the light emitting element 21 and the light receiving element 22, the sensor sensitivity is lowered due to the influence of transmission loss and scattered light. There was a problem.
Further, although the light guide portion 22b of the light receiving element 22 is covered by the light shielding tube 26 and the exterior / element support member 27, the resin constituting the optical system envelope is permeable, and thus the acrylic plate 25 is used. In addition, there is a problem that unnecessary light enters the light receiving element 22 through the translucent sealing adhesive 24.
[0006]
The present invention has been made in view of conventional problems, and it is an object of the present invention to improve the sensitivity of the pulse wave sensor and improve the detection accuracy of the pulse wave by eliminating unnecessary light incident on the light receiving element. .
[0007]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention includes a pair of light emitting elements and a light receiving element, and the reflected light from the light emitting element reflected from the artery of the subject's wrist is detected by the light receiving element, and the pulse of the subject is detected. A pulse wave sensor for detecting a wave is characterized in that the light emitting surface of the light emitting element and the light receiving surface of the light receiving element are exposed on a surface contacting the wrist of the sensor case. Accordingly, since the light emitting element and the light receiving element directly hit the wrist, the light from the light emitting element is injected into the wrist without loss, and only the light from the wrist enters the light receiving element, thereby improving the sensor sensitivity. It becomes possible.
Further, since there is no transparent plate such as an acrylic plate, disturbance light caused by scattering by the transparent plate does not enter the light receiving element, and the pulse wave detection accuracy is also improved.
According to a second aspect of the present invention, in the pulse wave sensor according to the first aspect, the light emitting surface and the light receiving surface are placed on the wrist by projecting the front end of the light emitting element and the front end of the light receiving element toward the wrist. The sensor sensitivity can be further improved.
[0008]
According to a third aspect of the present invention, in the pulse wave sensor according to the first or second aspect, the portion excluding the light emitting surface of the light emitting element and the light receiving surface of the light receiving element is a member having a light shielding property. This makes it possible to improve the detection accuracy of the pulse wave by eliminating unnecessary light incident on the light receiving element.
According to a fourth aspect of the present invention, in the pulse wave sensor according to the third aspect, the outer peripheral portion of the light emitting element and the light receiving element on the wrist side is covered with an exterior support member having a direct light shielding property. Thus, it is possible to ensure light shielding properties without using a light shielding tube.
The invention according to claim 5 is the pulse wave sensor according to claim 3 or claim 4, wherein the adhesive having a light shielding property is used as an encapsulating adhesive for encapsulating the light emitting element and the light receiving element in a sensor case. Thus, unnecessary light incident on the light receiving element via the encapsulating adhesive can be eliminated.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected about a conventional example and a part, The description is abbreviate | omitted.
1A and 1B are diagrams showing a schematic configuration of a pulse wave sensor 20 according to an embodiment of the present invention, in which 21 is a light emitting element, 22 is a light receiving element, 23 is a sensor case, and 28 is the light emitting element. An encapsulating adhesive for encapsulating the element 21 and the light receiving element 22 in the sensor case 23. In this example, as the encapsulating adhesive 28, an adhesive having a light shielding property such as a black adhesive is used. . Reference numeral 29 denotes an exterior support member that covers the outer peripheral portions of the light guide portions 21b and 22b of the light emitting element 21 and the light receiving element 22, and the exterior support member 29 is made of a light-shielding resin or adhesive.
In the pulse wave sensor 20 of the present example, the light emitting surface 21 s that is the distal end portion of the light emitting element 21 and the light receiving surface 22 s that is the distal end portion of the light receiving element 22 protrude from the surface that contacts the wrist 10 of the sensor case 23. The light emitting surface 21s and the light receiving surface 22s are exposed to the outside of the sensor, and the periphery of the slightly projecting light emitting element 21 and the light receiving element 22, that is, the portion excluding the light emitting surface 21s and the light receiving surface 22s is the exterior. The support member 29 is covered. Therefore, the surface of the pulse wave sensor 20 that comes into contact with the wrist 10 is a surface in which the light emitting surface 21s, the light receiving surface 22s, and the surrounding exterior support member 29 are slightly raised, and the pulse wave sensor 20 is attached to the wrist 10. In this case, the light emitting surface 21s and the light receiving surface 22s are in pressure contact with the skin, and the periphery thereof is surrounded by a light shielding material (exterior support member 29).
[0010]
When the pulse wave sensor 20 having such a configuration is brought into contact with the wrist 10, the light emitting surface 21s of the light emitting element 21 is brought into direct contact with the wrist 10 and is pressed against the skin, so that there is no transmission loss as in the prior art. Since all the near infrared rays irradiated from the light emitting element 21 toward the wrist 10 are injected into the wrist 10, the near infrared light from the light emitting element 21 can be used efficiently.
Near infrared rays irradiated from the light emitting element 21 toward the wrist 10 are reflected by red blood cells flowing through an artery (not shown) of the wrist 10 and enter the light receiving element 22.
In this example, the light receiving surface 22s of the light receiving element 22 is in direct contact with the wrist 10, and therefore there is no transmission loss due to the transparent plate or the like, so that the sensor sensitivity is improved and the light is scattered due to the transparent plate or the like. Since disturbance light does not enter the light receiving element, the pulse wave detection accuracy can be improved. At this time, since the light emitting surface 21s and the light receiving surface 22s are pressed against the skin, the near-infrared optical path is short, so that the sensor is compared with the case where the light emitting surface 21s and the light receiving surface 22s are simply in contact with the wrist 10. Sensitivity is greatly improved.
Further, the periphery of the light receiving surface 22s is covered with an exterior support member 29 made of a light shielding material so that unnecessary light from the outside of the sensor does not enter the light receiving element 22, so that a light shielding tube is not used. Sufficient light shielding properties can be ensured. Furthermore, since the back surfaces of the light emitting element 21 and the light receiving element 22 are covered with a sealing adhesive 28 having a light shielding property, sufficient light shielding properties can be secured also on the back surface side of the light receiving element 22.
[0011]
Thus, according to the present embodiment, the light emitting surface 21s of the light emitting element 21 and the light receiving surface 22s of the light receiving element 22 constituting the pulse wave sensor 20 are protruded from the surface of the sensor case 23 that contacts the wrist 10, Since the light emitting surface 21 s and the light receiving surface 22 s are pressed against the skin of the wrist 10, near infrared rays can be efficiently injected from the light emitting element 21 into the wrist 10, and the light receiving surface 22 s of the light receiving element 22 Since the reflected light from the wrist 10 directly enters, sensor sensitivity can be greatly improved. Further, a portion excluding the light emitting surface 21 s and the light receiving surface 22 s is covered with the exterior support member 29, and the back side of the light emitting element 21 and the light receiving element 22 is further covered with an encapsulating adhesive 28 having a light shielding property. Since unnecessary light from the outside of the sensor is prevented from entering the light receiving element 22, the pulse wave detection accuracy can be improved.
[0012]
In the above embodiment, the pulse wave sensor 20 in which one light emitting element 21 and one light receiving element 22 are arranged has been described. However, the present invention is, for example, the light receiving element 22 disclosed in Patent Document 1 above. However, the present invention is also applicable to other pulse wave sensors such as the pulse wave sensor 20 </ b> A having a configuration in which the light-emitting elements 21 are arranged concentrically and symmetrically.
Further, the configuration in which the light emitting surface 21 s of the light emitting element 21 and the light receiving surface 22 s of the light receiving element 22 of the present invention are exposed on the surface of the sensor case 23 that contacts the wrist 10 is a disc shape as shown in FIG. Needless to say, the present invention can be realized not only in the sensor case 23 but also in various types of sensor cases.
[0013]
【The invention's effect】
As described above, the light emitting surface of the light emitting element of the pulse wave sensor and the light receiving surface of the light receiving element are exposed on the surface of the sensor case that comes into contact with the wrist, so that the light emitting element and the light receiving element directly contact the wrist. Transmission loss can be greatly reduced, sensor sensitivity can be improved, and unnecessary light does not enter the light receiving element, so that the pulse wave detection accuracy can also be improved.
In addition, the tip side of the light emitting element and the tip side of the light receiving element are projected to the wrist side, and the portion excluding the light emitting surface and the light receiving surface is covered with a light-shielding member. Unnecessary incident light can be reduced, and the pulse wave detection accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a pulse wave sensor according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a conventional pulse wave sensor.
[Explanation of symbols]
10 wrists, 20 pulse wave sensors, 21 light emitting elements, 22 light receiving elements,
23 Sensor case, 28 Encapsulating adhesive, 29 Exterior support member.

Claims (5)

一対の発光素子と受光素子とを備え、被験者の手首の動脈から反射された発光素子からの反射光を受光素子で検出して、上記被験者の脈波を検出する脈波センサにおいて、上記発光素子の発光面と受光素子の受光面とをセンサケースの手首に当接する面に露出させたことを特徴とする脈波センサ。A pulse wave sensor comprising a pair of light emitting elements and a light receiving element, wherein the light receiving element detects reflected light from the light emitting element reflected from the artery of the subject's wrist and detects the pulse wave of the subject. A pulse wave sensor characterized in that a light emitting surface of the light receiving surface and a light receiving surface of a light receiving element are exposed on a surface that comes into contact with a wrist of a sensor case. 上記発光素子の先端部と受光素子の先端部とを手首側に突出させたことを特徴とする請求項１に記載の脈波センサ。2. The pulse wave sensor according to claim 1, wherein a tip end portion of the light emitting element and a tip end portion of the light receiving element are protruded toward the wrist side. 上記発光素子の発光面と受光素子の受光面とを除く箇所を、遮光性を有する部材で覆ったことを特徴とする請求項１または請求項２に記載の脈波センサ。The pulse wave sensor according to claim 1 or 2, wherein a portion excluding the light emitting surface of the light emitting element and the light receiving surface of the light receiving element is covered with a light shielding member. 上記発光素子と受光素子の手首側の外周部を、直接遮光性を有する外装支持部材で被覆したことを特徴とする請求項３に記載の脈波センサ。The pulse wave sensor according to claim 3, wherein the outer peripheral portion on the wrist side of the light emitting element and the light receiving element is covered with an exterior support member having a direct light shielding property. 上記発光素子と受光素子とをセンサケースに封入するための封入接着剤として、遮光性を有する接着剤を用いたことを特徴とする請求項３または請求項４に記載の脈波センサ。5. The pulse wave sensor according to claim 3, wherein an adhesive having a light shielding property is used as an encapsulating adhesive for encapsulating the light emitting element and the light receiving element in a sensor case.
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