JPH0938056A - Sphygmic data measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sphygmic data measuring device by which pulse wave can be inspected precisely and reliable data can be obtained by fixing a light transmissible plate more closely to the surface of a human body. SOLUTION: In a sensor unit 30 of this sphygmic data measuring device, which is to be attached to an arm, a light transmissible plate 34 is put on the surface of an LED and a photo transistor 32. The outer surface 341 of the light transmissible plate 34 to which a finger pushed is higher than the standard plane when the outer surface 361 of a sensor frame 36 surrounding the light transmissible plate 34 is to be the standard plane. Two terminals 38 for the body connection, which become in contact with the surface of the finger when the light transmissible plate 34 and the finger are stuck together, are mounted around the light transmissible plate 34. These terminals 38 also protrude from the standard plane. However, the outer surface 381 of the terminals 38 is lower than the outer surface 341 of the light transmissible plate 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse wave information measuring device for measuring and displaying pulse wave information such as pulse rate, and more particularly to a structure technology of a pulse wave signal detecting section thereof. Is.

[0002]

2. Description of the Related Art Among pulse wave information measuring devices capable of measuring and displaying pulse wave information such as pulse rate, an optical type LED
The phototransistor receives the light reflected from the finger (blood vessel) while irradiating light from the finger toward the finger surface, and changes in blood volume are detected as changes in the amount of received light, and the pulse rate is based on the detection result. And so on. In such a pulse wave information measuring device, as shown in FIG.
As shown in (b), the translucent plate 34 is provided on the front surface side of the LEDs 31C and 31D and the phototransistors 32C and 32D.
C and 34D are arranged, and a finger is pressed against the outer surfaces 341C and 341D of the transparent plates 34C and 34D to detect the pulse wave signal. Here, when the peripheries of the translucent plates 34C and 34D are the reference surfaces 361C and 361D, the translucent plates 34C and 3D are
The outer surfaces 341C and 341D of 4D are the same as the reference surface 36.
It is on the same plane as 1C and 361D, or at a position retracted from the reference planes 361C and 361D.

[0003]

However, in the conventional pulse wave information measuring device, the detection sensitivity of the pulse wave signal is low, and in particular, the sensitivity and data when used while being carried such as monitoring the pulse rate during running. There is a problem that the reliability of is low. The inventors of the present application have examined the reason for this problem and found that the outer surface 3 of the translucent plates 34C and 34D is
The conclusion was reached that the adhesion between 41C and 341D and the finger was not sufficient.

It is an object of the present invention to provide a pulse wave information measuring device having high detection sensitivity and high data reliability by improving the adhesion between the surface of the living body and the light transmitting plate.

[0005]

In order to solve the above-mentioned problems, a light emitting element that emits light toward the surface of a living body, and among the light emitted by this light emitting element, the light reflected from the living body side can be received. A light receiving element, and a pulse wave signal detection unit provided on the surface side of the light receiving element and the light emitting element and having a translucent plate in which the outer surface is in close contact with the biological surface, and a pulse wave signal detection unit based on the light receiving result of the light receiving element. In a pulse wave information measuring device having a data processing unit for obtaining wave information, and a device main body having a display unit for displaying the pulse wave information obtained by this data processing unit,
When the outer surface of the pulse wave signal detection unit around the light transmissive plate is used as a reference surface, the outer surface of the light transmissive plate is located at a position protruding from the reference surface.

In the present invention, the outer surface of the transparent plate may be a flat surface. Further, the outer surface of the light transmitting plate may be formed as a convex surface.

In the present invention, further, in the case where a human body grounding terminal which comes into contact with the living body surface when the transparent plate is brought into close contact with the living body surface is provided on the outer surface around the light transmitting plate in the pulse wave signal detecting section. In this case, it is preferable that the outer surface of the human body grounding terminal is located at a position lower than the outer surface of the translucent plate and protrudes from the reference surface.

In the present invention, further, a wrist band for attaching the device body to the arm and extending from the device body,
A cable having a pulse wave signal detection unit as a sensor unit at the tip and a unit fixing means for attaching the sensor unit to the living body so that the outer surface of the transparent plate and the living body surface are in close contact with each other are provided. For example, it can be configured as an arm-mounted pulse wave information measuring device that can detect the pulse rate during running.

[0009]

In the pulse wave information measuring device according to the present invention, since the outer surface of the light-transmitting plate that covers the light-emitting element and the light-receiving element has a structure protruding more than the surrounding portion of the light-transmitting plate, the surface of the living body is , The state is in close contact with the entire outer surface of the transparent plate. Further, even when the living body is used while being carried, the contact state remains stable even when the force with which the living body pushes the transparent plate changes. Moreover, when the living body is pressed by the amount of the protruding outer surface of the light-transmitting plate, the blood staying in the blood vessel is pushed away from this part. Has little effect. Therefore, the detection sensitivity of the light receiving element to the pulse wave signal is high, and the reliability of the obtained data is high.

When the outer surface of the light-transmitting plate is formed of a flat surface, the living body can be uniformly attached to the entire outer surface of the light-transmitting plate. On the other hand, when the outer surface of the light-transmitting plate is configured as a convex surface, pressing the living body lightly on the outer surface of the light-transmitting plate applies a pressing force to the light-transmitting plate. The adhesiveness with can be improved.

In the sensor unit, when the outer surface of the human body grounding terminal also projects from the surrounding portion, when the living body is pressed against the translucent plate, the living body surely contacts the human body grounding terminal. Even in this case, since the outer surface of the human body grounding terminal is located at a position lower than the outer surface of the translucent plate, it does not prevent the living body and the outer surface of the translucent plate from coming into close contact with each other.

[0012]

An embodiment of the present invention will be described with reference to the drawings.

(Overall Structure) FIG. 1 is an explanatory view showing a use state of the wrist-worn pulse wave information measuring apparatus of this example.

In FIG. 1, a wrist-worn pulse wave information measuring device 1 (pulse wave information measuring device) of this example has a device body 10 having a wristwatch structure, a cable 20 connected to the device body 10, and a device 20. The sensor unit 30 (pulse wave signal detection unit) provided on the distal end side of the cable 20 is generally configured. The device body 10 is provided with a wrist band 12 that is wound around the wrist from the 12 o'clock direction on the wristwatch and fixed at the 6 o'clock direction.
The device body 10 is detachable from the arm. The sensor unit 30 includes a sensor fixing band 40 (unit fixing means).
It is attached between the base of the index finger (living body) and the knuckle.

(Structure of the Device Main Body) FIG. 2 is a plan view showing the device main body of the wrist-worn pulse wave information measuring device of this embodiment with the wristband and cables removed, and FIG. It is the side view which looked at the pulse wave information measuring device from the 3 o'clock direction.

In FIG. 2, the apparatus main body 10 is provided with a resin watch case 11 (main body case), and on the surface side of the watch case 11, in addition to the current time and date, the pulse rate and other pulses are displayed. A liquid crystal display device 13 (display unit) that digitally displays wave information and the like is configured. In the inside of the watch case 11, a data processing circuit 50 that performs signal processing on the detection signal is displayed on the liquid crystal display device 13 in order to display a change in pulse rate based on the detection result (pulse wave signal) by the sensor unit 30. It is configured. Data processing circuit 5
Since the clock circuit is also configured at 0, the normal time, the lap time, the split time, etc. are also displayed on the liquid crystal display device 13.
Can be displayed.

Button switches 111 to 115 for time adjustment and switching of display modes are formed on the outer periphery of the watch case 11, and button switches 116 and 117 are formed on the surface of the watch case 11. There is. The power source of the wrist-worn pulse wave information measuring device 1 is a button-shaped battery 59 built in the watch case 11, and the cable 20 supplies electric power from the battery 59 to the sensor unit 30 and the sensor unit 30. The detection result is input to the data processing circuit 50 in the watch case 11.

In the arm-worn pulse wave information measuring apparatus 1, it is necessary to increase the size of the apparatus main body 10 as its function is increased. However, the apparatus main body 10 has a restriction that it is worn on the arm. The device body 10 cannot be enlarged in the directions of 6 o'clock and 12 o'clock in the wristwatch. In view of this, in this example, the device body 10 uses the horizontally long watch case 11 whose length dimension in the directions of 3 o'clock and 9 o'clock is longer than the length dimension in the directions of 6 o'clock and 12 o'clock. However, since the wristband 12 is connected at a position biased toward the 3 o'clock side, the wristband 12 has a large overhanging portion 101 in the 9 o'clock direction when viewed from the wristband 12, but such a large overhang is present. The part is not in the 3 o'clock direction. Therefore, instead of using the horizontally long watch case 11, the wrist can be freely bent, and even if the watch falls, the back of the hand cannot be bent.
Never hit one.

A battery 59 is provided inside the watch case 11.
On the other hand, in the direction of 9 o'clock, the flat piezoelectric element 5 for the buzzer
8 are arranged. Since the battery 59 is heavier than the piezoelectric element 58, the position of the center of gravity of the apparatus main body 10 is in a position deviated in the 3 o'clock direction. Since the wrist band 12 is connected to the side where the center of gravity is deviated, the device body 10 can be stably attached to the arm. In addition, the battery 59 and the piezoelectric element 5
8 and 8 are arranged in the plane direction, the apparatus main body 10 can be made thin, and the user can easily replace the battery 59 by providing the battery lid 118 on the back surface part 119 as shown in FIG. .

(Structure for Preventing Rotation of Device Main Body) In FIG. 3, a connecting portion 105 for holding the stopper shaft 121 attached to the end portion of the wristband 12 is formed in the 12 o'clock direction of the watch case 11. Has been done. Watch case 11
In the direction of 6 o'clock, the wristband 12 wound around the arm is folded back at an intermediate position in the longitudinal direction, and a receiving portion 106 to which a fastener 122 for holding the intermediate position is attached is formed. .

In the 6 o'clock direction of the device body 10, the portion from the back surface portion 119 to the receiving portion 106 is the watch case 1
It is molded integrally with 1 and is about 115 ° to the back surface 119.
The rotation stopping portion 108 forms an angle. That is, when the device main body 10 is mounted by the wristband 12 so as to be positioned on the upper surface portion L1 (the back of the hand) of the right wrist L (arm), the back surface portion 119 of the watch case 11 is attached to the upper surface portion L1 of the wrist L. While the rotation stopper 108 is
It abuts on the side face L2 having the radius R. In this state, the back surface portion 119 of the apparatus body 10 feels to straddle the radius R and the ulna U, while the bending portion 109 between the rotation stopping portion 108 and the back surface portion 119 and the rotation stopping portion 108 contact the radius R. It makes you feel like you're in touch. As described above, since the rotation stopping portion 108 and the back surface portion 119 form an anatomically ideal angle of about 115 °, the device body 10 is moved in the direction of arrow A and the device body 10 is moved in the arrow direction. Even if it is attempted to turn in the direction of B, the device body 10 will not unnecessarily shift further. Further, the back surface part 119 and the rotation stopping part 108 only restrict the rotation of the apparatus main body 10 at two positions on one side around the arm. Therefore, even if the arm is thin, the back surface portion 119 and the rotation stopping portion 108 are surely brought into contact with the arm, so that the rotation stopping effect can be surely obtained, while the thick arm does not feel cramped.

(Structure of Sensor Unit) FIG. 4 is a plan view of a sensor unit used in the wrist-worn pulse wave information measuring apparatus of this embodiment, and FIG. 5 is a sectional view taken along the line II ′ of FIG. 6
4 is a cross-sectional view taken along the line II-II ′ of FIG. 4, and FIG.
FIG. 3 is a sectional view taken along line III-III ′.

In FIG. 4, the sensor unit 30 has a component housing space 300 formed inside a sensor frame 36 as a case body, and a circuit board 35 is arranged inside the component housing space 300. Electronic components such as the LED 31, the phototransistor 32, the diode 391, and the transistor 392 are mounted on the circuit board 35. The end of the cable 20 is fixed to the sensor unit 30 by a bush 393, and each wiring of the cable 20 is soldered on the pattern of the circuit board 35. Here, the sensor unit 30 is attached to the finger so that the cable 20 is pulled out from the base side of the finger to the apparatus main body 10 side. Therefore, LED3
1 and the phototransistor 32 are arranged along the length direction of the finger, of which the LED 31 is located on the tip side of the finger and the phototransistor 32 is located on the base of the finger.

As can be seen from FIG. 5, the component storage space 30
0 is configured by covering the back side of the sensor frame 36 with the back cover 302. A light transmission window is formed by a light transmission plate 34 made of a glass plate on an upper surface portion (substantially pulse wave signal detection portion) of the sensor frame 36, and the circuit board 35 is a component so as to face the light transmission plate 34. It is fixed in the storage space 300. Therefore, the LED 31 and the phototransistor 32 have their light emitting surface and light receiving surface facing the light transmitting plate 34, respectively. Therefore, the outer surface 34 of the translucent plate 34 is
When the finger surface is brought into close contact with 1 (contact surface with the finger surface / sensor surface), the LED 31 emits light toward the finger surface side, and the phototransistor 32 causes the phototransistor 32 to emit light of the finger emitted from the LED 31. The light reflected from the side can be received.

As shown in FIGS. 5, 6 and 7, when the outer surface 361 of the sensor frame 36 surrounding the light transmitting plate 34 is used as a reference surface, the outer surface 341 of the light transmitting plate 34 has a reference surface ( It is located at a position protruding from the outer surface 361) of the sensor frame 36.

Further, as shown in FIG. 6, two human body grounding terminals 38, which come into contact with the finger surface when the transparent plate 34 and the finger are brought into close contact with each other, are provided around the transparent plate 34 with screws 306. It is fixed to the sensor frame 301 by. Here, the two human body grounding terminals 38 are arranged on both sides of the transparent plate 34 so as to sandwich the transparent plate 34. A packing 394 is fitted around the human body grounding terminal 38.

Here, the human body grounding terminal 38 also has a reference surface (the outer surface 36 of the sensor frame 36) as can be seen from FIG.
It projects from 1). However, the outer surface 381 (contact surface with the finger surface) of the human body grounding terminal 38 is located at a position lower than the outer surface 341 of the translucent plate 34 when viewed from the reference surface (the outer surface 361 of the sensor frame 36). .

In this example, as the LED 31, InGaN is used.
System (indium-gallium-nitrogen system) blue LED is used, and its emission spectrum is as shown in FIG.
It has an emission peak at 450 nm and its emission wavelength range is
It is in the range of 350 nm to 600 nm. In this example, a GaAsP-based (gallium-arsenic-phosphorus-based) phototransistor is used as the phototransistor 32 so as to correspond to the LED 31 having such light emission characteristics.
As shown in FIG. 9, the light-receiving wavelength region of the device itself has a main sensitivity region in the range of 300 nm to 600 nm, and there is a sensitivity region even below 300 nm. Here, as the phototransistor 32, a sensor unit in which a filter is added to an element may be used, and an example of the light receiving wavelength region of such a sensor unit is, as shown in FIG. 10, a main sensitivity region from 400 nm to 550 nm. Is in the range.

In the sensor unit 30 constructed as described above, as shown in FIG.
When is attached to the base of a finger, the LED 31 and the phototransistor 32 are in a state in which their light emitting surface and light receiving surface face the finger surface. In this state, when the LED 31 emits light toward the finger, the phototransistor 32 receives the light reflected from the living body (blood vessel), and the light reception result (pulse wave signal) is transmitted via the cable 20 to the apparatus body 10. When input to, the apparatus body 10 obtains the pulse rate from the pulse wave signal.

(Configuration of Data Processing Circuit) That is, FIG.
2, in the data processing circuit 50, the pulse wave signal converter 51 is connected to the pulse wave signal converter 51 from the sensor unit 30 via the cable 20 as shown in a block diagram of a part of the function of the data processing circuit configured inside the watch case. The input signal is converted into a digital signal and output to the pulse wave signal storage unit 52. The pulse wave signal storage unit 52 is a RAM that stores the pulse wave data converted into a digital signal. The pulse wave signal calculation unit 53 reads the signal stored in the pulse wave signal storage unit 52, performs frequency analysis on the signal, and inputs the result to the pulse wave component extraction unit 54.
The pulse wave component extraction unit 54 extracts the pulse wave component from the input signal from the pulse wave signal calculation unit 53 and outputs it to the pulse rate calculation unit 55, and the pulse rate calculation unit 55 determines the frequency of the input pulse wave. The pulse rate is calculated by the component, and the result is calculated by the liquid crystal display device 1.
3 is output.

(Connecting Structure of Cable and Device Main Body) In the wrist-worn pulse wave information measuring device 1 of this example, as shown in FIG.
Can be attached and detached on the surface side of the end portion of the apparatus body 10 located in the 6 o'clock direction. That is, as shown in FIG. 3, in the 6 o'clock direction of the apparatus body 10, the connector portion 70 is formed on the surface side of the portion extended as the rotation stopping portion 108, and the cable 20 is provided therein. The connector piece 80 configured at the end portion of can be attached. Therefore, the connector section 70 is on the front side when viewed from the user, and is easy to operate. Further, since the connector part 70 does not project from the device body 10 in the direction of 3 o'clock, the user can freely move his / her wrist during running, and even if the user falls down during running, the back of the hand will not hit the connector part 70. Absent.

Connector 70 and connector piece 80
The electrical connection made in (connector means) is
This is as shown in FIG.

In FIG. 13, terminals 751 to 756 are provided on the connector portion 70 formed on the apparatus main body 10 side.
(First terminal group), and these terminals 75
Corresponding to 1 to 756, the connector piece 80 is provided with electrode portions 831 to 836 (second terminal group).
Among them, the terminal 752 is the LED through the electrode portion 832.
31 is a positive terminal for supplying the second drive voltage VDD to the terminal 31, a terminal 753 is a terminal to be a negative potential of the LED 31 via the electrode portion 833, and a terminal 754 is an electrode portion 83.
Terminal for supplying a constant voltage VREG for driving to the collector terminal of the phototransistor 32 via
Reference numeral 1 denotes a terminal to which a signal from the emitter terminal of the phototransistor 32 is input via the electrode portion 831, and a terminal 755.
Is a terminal to which a signal for detecting whether or not the connector piece 80 is attached to the connector portion 70 is input via the electrode portion 835.

The electrode portion 836 is grounded to the human body in the sensor unit 30 through the human body grounding terminal 38 shown in FIGS. 4 and 6, and the terminal 756 and the electrode portion 836 are electrically connected. At this time, the electrode portions 831 to 836 are shielded by using VDD as the ground line.

In the connector piece 80, the first capacitor C1 and the first switch SW1 are inserted between the terminals of the LED 31 (between the electrode portions 832 and 833). The switch SW1 is closed when the connector piece 80 is removed from the connector portion 70,
When the first capacitor C1 is connected in parallel to 31 and the connector piece 80 is attached to the connector portion 70, the first capacitor C1 is opened. Similarly, the second capacitor C2 and the second switch SW2 are inserted between the terminals of the phototransistor 32 (electrode portions 831 and 834).
The switch SW2 is in a closed state when the connector piece 80 is removed from the connector section 70, and the second capacitor C2 is connected in parallel to the phototransistor 32, and when the connector piece 80 is attached to the connector section 70. The open state.

The structures of the connector portion 70 and the connector piece 80 will be described in detail with reference to FIGS.

FIG. 14 is an enlarged view showing the structure of the connector piece formed at the end of the cable, FIG. 15 is an enlarged view of the connector section on the apparatus main body side, and FIG. 16 is the connector piece with respect to the connector section. FIG. 6 is a vertical cross-sectional view showing a combined state.

In FIG. 14, a pair of protrusions 81 and 82 are formed on the lower surface 801 of the connector piece 80 so as to project downward on both sides thereof. Four engaging pieces 811, 812, 821, 822 (second engaging projection group) project inward from the lower ends of the protruding portions 81, 82.

On the lower surface 801 of the connector piece 80,
Six electrode parts 831, 832, 833, 834, 83
5, 836 (second terminal group) are formed, and annular ridges 841, 842, 843, 844, and
845 and 846 are formed. Here, when the connector piece 80 is attached to the connector portion 70, the connector piece 80 is covered with the connector portion 70 and then the connector piece 80 is slid in the direction of arrow Q, as described later. Along the direction of arrow Q),
The electrode portions 831 to 836 are the electrode portions 831, 832, and 83.
3 and electrode portions 834, 835, 836 are formed in two rows. Further, in any of the columns, the electrode parts 831 to 8
36 is obliquely arranged so as to be displaced in a direction orthogonal to the sliding direction of the connector piece 80 (direction of arrow Q).

Further, on the bottom surface of the connector piece 80, two operation pins 837 and 838 for switching a circuit for preventing the influence of static electricity when the cable 20 is connected to the apparatus body 10 are formed. . These operating pins 837 and 838 are in a state in which the tips project from the lower surface portion 801 of the connector piece 80 when the connector piece 80 is removed from the connector portion 70.

On the other hand, as shown in FIG.
0, the engaging portions 71, 72, 73, 74 protruding outward.
(First engaging projection group) is formed. Therefore, the protruding portions 81 and 82 of the connector piece 80 are
The engaging parts 71, 72, 73, 74 of the connector are located outside, and the connector piece 80 is provided between the engaging parts 71 and 72 and between the engaging parts 73 and 74. Engaging piece 81
After the connector piece 80 is covered with the connector part 70 so that the first and the second parts 821 are located, the engaging pieces 811, 821 are provided between the engaging part 71 and the engaging part 72, and the engaging part 73 and the engaging part. 7
4, the connector piece 80 is pressed toward the connector portion 70 so as to pass through between them, and then,
When the connector piece 80 is slid in the direction of arrow Q, the engaging pieces 811, 821 sneak under the engaging portions 71, 73. Further, under the engaging portions 72, 74, the engaging pieces 812,
822 sneaks in. As a result, the engagement pieces 811, 821,
Reference numerals 812 and 822 denote the lower surface portion 801 of the connector piece 80.
And the engaging portions 71, 72, 73, 74 are respectively held between the connector piece 80 and the connector portion 80.
It can be easily and surely attached to 0.

In this way, the connector piece 80 is engaged when it is slid on the connector portion 70 in the direction of arrow Q, and from this state, the connector piece 80 is slid in the opposite direction (direction of arrow R). An engagement mechanism 700 is configured to be released from the engaged state when the engagement mechanism 700 is operated. The engagement mechanism having such a structure has a small number of parts, but the engagement is reliable. Further, when the connector piece 80 is slid on the connector portion 70 from the 6 o'clock direction to the 12 o'clock direction, the force applied to the apparatus main body 10 is the rotation stopper portion 1.
08, the apparatus main body 10 is oriented so that it is more difficult to rotate. Therefore, even when the connector piece 80 is mounted, the apparatus body 10 does not rotate around the wrist, and thus the mounting is easy.

Here, like the electrode portions 831 to 836, the terminals 751 to 756 are arranged along the sliding direction of the connector piece 80 (direction of arrow Q), and the terminals 751 to 752,
753 and terminals 754, 755, 756 are formed in two rows. Further, in each row, each terminal 751 to 75
6 is the connector piece 8 similar to the electrode parts 831 to 836.
It is obliquely arranged so as to be displaced in a direction orthogonal to the sliding direction of 0 (direction of arrow Q). Therefore, when the connector piece 80 is attached to the connector part 70, the six terminals 751 to 756 of the connector part 70 are electrically connected to the six electrode parts 831 to 836 of the connector piece 80, respectively, and the sensor unit 30 It is possible to input the measurement result of 1 to the apparatus main body 10 via the cable 20.

The terminals 751 to 756 and the electrode portion 8
31 to 836 are arranged in two rows along the sliding direction of the connector piece 80, and the positions between the terminals and between the electrodes are obliquely displaced in the direction orthogonal to the sliding direction. Even if 80 is slid on the connector part 70, the uncorresponding terminals 751 to 756 and the electrode parts 831 to 836 do not come into contact with each other.
Further, even if the formation area of the connector portion 70 is narrowed, the terminals and the electrode portions can be arranged at positions separated from each other, so that even if water enters between the connector piece 80 and the connector portion 70, the gap between the terminals and It is difficult to short circuit between electrodes. In addition, since the terminals 752, 754, 756 to which the driving voltage is applied and the electrode portions 832, 834, 836 are arranged so as to be apart from each other, tracking is not performed between terminals and electrode portions having different potentials. Does not occur.

(Structure of Stopper Mechanism) As can be seen from FIG. 15, the engaging portions 71 to 74 are formed with vertical walls 711, 721, 731 and 741 on the side in the direction of arrow Q. Therefore, when the connector piece 80 is slid in the direction of the arrow R when the connector piece 80 is attached to the connector portion 70 (second operation), the engaging pieces 811, 81
2, 821, 822 are vertical walls 711, 721, 73
1, 741, respectively, and the connector piece 80 is stopped at the mounting position of the connector portion 70. That is, the vertical walls 711, 721, 731, 741 function as a first stopper for the connector piece 80. vice versa,
When the connector piece 80 is slid in the direction of the arrow R to disengage from the connector portion 70, the engaging pieces 811, 821
Are vertical walls 721 and 741 of the engaging portions 72 and 74, respectively.
Abutting on the back side of the connector piece 80,
Stop at the original position. That is, the vertical walls 721, 7
The back side of 41 functions as a second stopper for the connector piece 80.

(Structure of Terminal and Electrode Section) Connector Section 70
In the above, the terminals 751 to 756 are all holes 761, 762, 763, and 76 formed in the connector section 70.
4, 765, 766, of which terminals 753, 756, actuating pin 838, and electrode portion 8 are disposed.
A cross section when cut at a position passing through the formation positions of 33 and 836 is shown in FIG.

In FIG. 16, the connector piece 80 is
An outer case 805 capable of accommodating the circuit board 85 inside is covered with a lid member 806. The lid member 806 includes
Holes 863 and 866 are formed, and annular protrusions 843 and 846 are formed along the opening edge on the lower side thereof. Electrode portions 833 and 836 are arranged inside the holes 863 and 866. The electrode portion 833 is fixed by a screw 881, and the electrode portion 836 is fixed by being sandwiched between the circuit board 85 and the lid member 806. Waterproof packings 873 and 876 are attached to the electrode portions 833 and 836. The electrode portions 833 and 836 are electrically connected to the circuit pattern of the circuit board 85 arranged inside the connector piece 80. Such an electrode structure has electrode parts 833, 8
The same applies to the electrode parts 831, 832, 834, and 835 other than 36. In addition, on the circuit pattern of the circuit board 85,
The core wire of the cable 20 is also electrically connected by soldering.

(Construction of Click Mechanism) The connector portion 70 has a structure in which the concave portion is covered with the lid member 706.
Holes 763 and 766 are formed in the lid member 706. Inside these holes 763 and 766, terminals 753,
756 is arranged as an advance / retreat pin capable of advancing / retreating so that the tip end is projected from the holes 763 and 766. Collar 7 formed on the base side of each terminal 753, 756
Coil springs 773 and 776 are arranged for 83 and 786, and the terminals 753 and 756 are urged by the coil springs 773 and 776 in a direction projecting from the holes 763 and 766. . However, Tsuba 78
Since the outer diameter of 3, 786 is larger than the inner diameter of the holes 763, 766, the terminals 753, 756 will not come out of the holes 763, 766. This terminal structure has a terminal 7
Terminals 751, 752, 754, 75 other than 53, 756
5 is also the same.

When mounting the connector piece 80 on the connector portion 70, the connector piece 80 is attached to the connector portion 7.
In order to slide on 0, the terminals 753, 756 pass over the annular protruding portions 843, 846 of the connector piece 80 while being biased by the coil springs 773, 776, and are securely connected to the electrode portions 833, 836. To do. Further, since the click mechanism is configured by using the projections 843 and 846, the terminals 753 and 756, and the coil springs 773 and 776 as they are, the connector piece 80 can be reliably attached to the connector 70. In order to configure such a click mechanism, conversely to this example, the connector piece 8
A terminal using an advance / retreat pin is provided on the side of 0
A ridge portion may be provided on the 0 side.

(Structure of Switch Mechanism) Connector Piece 8
A hole 868 is formed in the cover member 806 of No. 0, and an operation pin 838 is arranged in the hole 838. The actuating pin 838 is in a state capable of advancing and retracting inside the hole 868 so that the distal end thereof projects from the hole 868.
A switch spring 88 in the form of a leaf spring is arranged with respect to the collar portion 898 formed at the base of the operation pin 838. The switch spring 88 biases the actuating pin 838 in a direction projecting from the hole 868 by the tip portion 885 thereof. However, since the outer diameter of the collar 898 is larger than the inner diameter of the hole 868, the operating pin 838 does not come out of the hole 868. The base of the switch spring 88 is the electrode portion 83.
3 is fastened to the upper end surface of No. 3 by a screw 881,
It is electrically connected to 3. Here, although not shown in the drawing, the operation pin 8 is provided at the tip portion 885 of the switch spring 88.
An abutting portion that is in contact with the base portion of 38 and a contact point that is formed in a portion that projects laterally from the abutting portion are formed. This contact is electrically connected to the circuit pattern of the circuit board 85, and the circuit pattern is interposed between the first capacitor C1 and the electrode portion 833.

Therefore, in a state where the connector piece 80 is not attached to the connector portion 70, as shown by the solid line in FIG. 16, the operating pin 838 is pushed by the switch spring 88 so that its tip projects from the hole 868, and in FIG. The first switch SW1 is closed and the first capacitor C1 is
31 in a state of being electrically connected in parallel. Therefore,
Electrodes 832 and 8 are at a high potential due to static electricity
Even if touching 33, the electric charge is stored in the first capacitor C1, so that the LED 31 is not damaged. On the other hand, when the connector piece 80 is attached to the connector portion 70, the actuating pin 838 moves in the direction of retracting into the hole 868 to move the switch spring 88 into the two-dot chain line, as shown by the two-dot chain line in FIG. Transform as shown in. As a result, in FIG. 13, the first switch SW1 is in the open state, so that the circuit configuration is such that the pulse wave can be measured. At this time, even if electric charge is accumulated in the first capacitor C1, the electric charge is accumulated in the electrode portions 832 and 833 and the terminal 75.
2, 753, the connector unit 70 and the apparatus main body 10
It does not discharge to each circuit built in.

The switch mechanism is the phototransistor 32.
However, since the configuration is similar to that of the switch mechanism for the LED 31, the description thereof will be omitted.

(Operation) The operation of the wrist-worn pulse wave information measuring device 1 thus constructed will be briefly described with reference to FIGS. 1 and 11.

First, in FIG. 1, when the wrist-worn pulse wave information measuring device 1 is used as an ordinary wrist watch, the cable 20 and the sensor unit 30 are detached from the connector portion 70 of the device body 10, and the connector portion 70 is attached. , Attach the specified connector cover. The connector cover having the same structure as the connector piece 80 can be used. However, the connector cover does not require an electrode part or the like. When the pulse rate during running is measured using the wrist-worn pulse wave information measuring device 1, the connector piece 80 is attached to the connector portion 70 and the cable 20 is attached to the device body 10.
Then, the device body 10 is attached to the wrist with the wristband 12. In addition, running is performed in a state where the sensor unit 30 is in close contact with the base of the finger by the sensor fixing band 40. As described above, when the sensor unit 30 is attached to the base of the finger, the cable 20 can be short, so that the cable 20 does not interfere with running. Further, when the distribution of body temperature from the palm to the fingertip is measured, the temperature at the fingertip decreases significantly when it is cold, whereas the temperature at the base of the finger does not relatively decrease. Therefore, if the sensor unit 30 is attached to the base of the finger, the pulse rate and the like can be accurately measured even when running outdoors on a cold day.

In this state, as shown in FIG.
When light is emitted from 31 toward the finger, the light reaches the blood vessel, and is partially absorbed by hemoglobin in the blood and partially reflected. The light reflected from the finger (blood vessel) is received by the phototransistor 32, and the change in the amount of received light corresponds to the change in blood volume (pulse wave of blood). That is, when the blood volume is large, the reflected light becomes weak, while when the blood volume is small, the reflected light becomes strong. Therefore, if the change in the reflected light intensity is detected, the pulse rate or the like can be measured. In order to perform such a measurement, the data processing circuit 50 shown in FIG. 12 converts the signal input from the phototransistor 32 (sensor unit 30) into a digital signal, and frequency-analyzes the digital signal to perform pulse rate measurement. Is calculated. And
The calculated pulse rate is displayed on the liquid crystal display device 13.

In FIG. 11, a part of the light emitted from the LED 31 reaches the blood vessel through the finger as indicated by arrow C, and the reflected light from hemoglobin in the blood is indicated by arrow D. It reaches the phototransistor 32. In addition, a part of the light emitted from the LED 31 is indicated by an arrow E.
As shown by, the phototransistor 32 is reflected by the surface of the finger.
Reach. Further, a part of the light emitted from the LED 31 and the light reflected from the blood vessel does not reach the phototransistor 32 by being absorbed or dispersed in the finger as shown by arrows F and G.

In this example, an LED 31 having an emission wavelength range of 350 nm to 600 nm and a phototransistor 32 having a reception wavelength range of 300 nm to 600 nm are used. The biological information is displayed based on the detection result in the wavelength region up to about 600 nm. If such sensor unit 30 is used, even if external light hits the exposed portion of the finger, the light included in the external light and having a wavelength region of 700 nm or less uses the finger as a light guide and the phototransistor 32.
Does not reach the (light receiving part).

The reason will be described with reference to FIG.
FIG. 17A is a graph showing the relationship between the wavelength of light and the light transmittance of the skin. The polygonal line a is the transmission characteristic of light with a wavelength of 200 nm, and the polygonal line b is the transmission of light with a wavelength of 300 nm. The characteristic, the polygonal line c shows the transmission characteristic for light with a wavelength of 500 nm, the polygonal line d shows the transmission characteristic for light with a wavelength of 700 nm, and the polygonal line e shows the transmission characteristic for light with a wavelength of 1 μm. As is clear from this figure, among the light included in the external light, the light having a wavelength range of 700 nm or less tends to hardly pass through the finger, and therefore the external light is not covered by the sensor fixing band 40. Even if it is irradiated to the part of, the phototransistor 32 does not reach through the finger as shown by the dotted line X in FIG. On the other hand, 880 nm
When an LED having a light emission peak in the vicinity and a silicon-based phototransistor are used, the light receiving wavelength range is 3
It ranges from 50 nm to 1200 nm. That is, as indicated by the arrow Y in FIG. 11, the detection result by the light of the wavelength of 1 μm (the light indicated by the broken line e in FIG. 17A) that easily reaches the light receiving portion by using the finger as a light guide. If the pulse wave is detected based on, the erroneous detection due to the fluctuation of the external light is likely to occur.

From the viewpoint of obtaining pulse wave information without being affected by external light, for example, as shown in FIG. 18, a GaP LED having a main light emitting region in the range of 540 nm to 570 nm. Then, as shown in FIG. 19 for the light receiving sensitivity characteristic, a GaP-based phototransistor having a sensitivity region in the range of 200 nm to near 700 nm may be used.

Further, since the pulse wave information is obtained by using the light in the wavelength range from about 300 nm to about 700 nm, the S / N ratio of the pulse wave signal based on the blood volume change is high. That is, in FIG. 17 (b), the absorption characteristic of hemoglobin not bound to oxygen is shown by the curve Hb, and the absorption characteristic of hemoglobin bound to oxygen is shown by the curve HbO2. , Wavelength from 300nm to 7
The absorption coefficient for light up to 00 nm is large, which is several times to about 100 times or more larger than the absorption coefficient for light having a wavelength of 880 nm which is conventional detection light. Therefore, as in this example, when light in the wavelength region (300 nm to 700 nm) having a large absorption coefficient is used as detection light in accordance with the absorption characteristics of hemoglobin, the detection value changes sensitively to blood volume changes. , Detection rate of pulse wave based on blood volume change (S / N
Ratio) is high.

(Main Effects of the Embodiment) As described above, the wrist-worn pulse wave information measuring device 1 of this embodiment is convenient for carrying, such as measuring the pulse rate during running, and has sensitivity and sensitivity. Highly reliable measurement results. That is, as shown in FIG. 20A, in the sensor unit 30 of this example, the outer surface 341 of the light-transmitting plate 34 is in a position projecting from the reference surface (outer surface 361 of the sensor frame 36). The finger surface is evenly adhered to the entire outer surface 341 of the transparent plate 34. Further, in this state, even if the position of the finger is slightly displaced, the state where the finger is evenly adhered to the entire outer surface 341 of the transparent plate 34 remains. On the other hand, as shown in FIG. 20B, in the conventional structure, the translucent plate 34 is used.
Since the outer surface 31D of D is retracted, even if a finger is placed on the transparent plate 34D, the corner portion of the transparent plate 34D cannot be covered. As described above, the pulse wave signal cannot be detected at the corner portion not covered with the finger because the air layer is interposed. Also, in the conventional structure, even if the position of the finger is slightly displaced,
Since an air layer intervenes over a wide range between the transparent plate 34D and the finger, if the finger moves while being carried, the sensitivity is significantly reduced.

Furthermore, in the sensor unit 30 of this example,
As the outer surface 341 of the translucent plate 34 projects, as shown in FIG. 21, blood retained in the blood vessel (see FIG. 21).
Are indicated by white circles. It can be said that the effect of such stagnant blood is small because it retreats sideways). That is,
The signal detected by the phototransistor 32 includes a signal component due to stagnant blood and a signal component due to flowing blood, and the pulse rate is obtained from the signal component due to flowing blood. On the other hand, since the signal component due to stagnant blood is the background (noise) of the detected signal, it is considered that the sensitivity is higher when the stagnant blood is pushed away as in this example. I can say.

This effect can be confirmed from the examination results shown in FIGS. 22 to 27.

First, in FIG. 22 and FIG. 23, FIG.
As shown in (b), the outer surface 341 of the transparent plate 34D.
In the sensor unit (conventional example) with a structure in which D is retracted 0.2 mm from the reference surface, the weight (pressing force) on the finger surface is applied.
And the AC component (solid lines P1 and P) included in the detected signal.
3) and the results of evaluating the relationship with the levels of the DC components (solid lines P2, P4) are shown. Here, FIG. 22 and FIG.
3 shows the results of two experiments performed repeatedly.

In this evaluation, the AC component (AC) is
It is a signal based on the flow of blood in blood vessels and corresponds to a pulse wave signal. On the other hand, the direct current component (DC) is a signal based on disturbance or other causes. Therefore, it can be said that the higher the ratio of the AC component in the detected signal, the higher the sensitivity.

Therefore, the ratio of the AC component to the DC component is obtained based on the result shown in FIG. 22, and the relationship between this ratio and the weight of the sensor unit on the finger surface is shown in FIG.

As a result, in the sensor unit according to the comparative example, first, as shown in FIGS. 22 and 23, the level of the AC component is as low as around 6 mV even when a large weight is applied. Further, as shown in FIG. 24, unless a weight of about 110 gf or more is applied, the ratio of the AC component to the DC component does not increase.

On the other hand, FIG. 25 and FIG.
As shown in (a), in the sensor unit 30 (embodiment) having a structure in which the outer surface 341 of the translucent plate 34 is projected by 0.25 mm from the reference surface, the weight (pressing force) on the finger surface is applied.
And the AC component included in the detected signal (solid lines P5, P
7) and the direct current component (solid lines P6 and P8). Note that FIG. 25 and FIG. 26 show the results of two experiments performed repeatedly. FIG. 25
The ratio of the AC component to the DC component is obtained based on the result shown in FIG. 27, and the relationship between this ratio and the weight of the sensor unit 30 on the finger surface is shown in FIG.

As a result, in the sensor unit 30 of the present example, as shown in FIGS. 25 and 26, the level of the AC component reaches 7 mV or more and the level is stable by applying a relatively small weight. are doing. Further, as shown in FIGS. 25 and 27, it was also confirmed that if a weight of 30 gf to 230 gf is applied, the ratio of the AC component to the DC component is large and stable, that is, the sensitivity is high.

Therefore, unlike the conventional sensor unit, the sensor unit 30 of this example requires a small force for pressing the sensor unit 30 against a finger, even though stable and high sensitivity is obtained, and the sensor unit 30 is mounted. There is no sense of incongruity.

Further, in the sensor unit 30 of this example,
As shown in FIG. 20A, the outer surface 381 of the human body grounding terminal 38 is a reference surface (the outer surface 36 of the sensor frame 36).
Since it protrudes from 1), the finger surface surely contacts the human body grounding terminal 38. Even in this case, the outer surface 381 of the human body grounding terminal 38 is the outer surface 3 of the translucent plate 34.
Since it is located at a position lower than 41, it does not prevent the finger surface from coming into close contact with the outer surface 341 of the transparent plate 34.

In addition, the human body grounding terminal 38 is the transparent plate 3
Since they are arranged on both sides so as to sandwich 4 between them, even if the finger is slightly displaced from the translucent plate 34, the finger and the human body grounding terminal 38 are provided.
Remains firmly in contact with.

(Other Embodiments) Although the outer surface 341 of the light transmitting plate 34 is a flat surface in this embodiment, instead of this, as shown in FIG. The surface 341A may be convex. In this case,
Since the pressing force is applied to the transparent plate 34A only by gently touching the outer surface 341A of the transparent plate 34A with a finger, the adhesion between the finger surface and the outer surface 341A of the transparent plate 34A can be enhanced.

In this example, the sensor unit 30 (pulse wave signal detector) is provided at the tip of the cable 20 because it is worn on the wrist, but the pulse wave signal is detected on the surface of the apparatus body 10 itself. The parts may be integrally formed.

Furthermore, in this example, the pulse wave was measured on the finger surface, but other surface parts of the living body, such as the wrist,
Even if the pulse wave is measured on the surface of the skin such as the earlobe,
The same effect as this example is achieved.

[0076]

As described above, in the pulse wave information measuring device according to the present invention, the outer surface of the light transmitting plate that covers the light emitting element and the light receiving element is projected more than the peripheral portion of the light transmitting plate. It is characterized by Therefore, according to the present invention, the living body surface is in close contact with the entire outer surface of the transparent plate. Further, even when the living body is used while being carried, the contact state remains stable even when the force with which the living body pushes the transparent plate changes. Moreover, when the living body is pressed by the amount that the outer surface of the translucent plate is projected, the stagnant blood in the blood vessel is pushed away from this part, so that the signal detected by the light receiving element is less affected by the stagnant blood. Therefore, the detection sensitivity of the light receiving element to the pulse wave signal is high, and the reliability of the obtained data is high. Furthermore, even if stable high sensitivity is obtained, the force of pressing the translucent plate against the living body is small, and there is no discomfort when worn.

When the outer surface of the light-transmitting plate is formed of a flat surface, the living body can be uniformly attached to the entire outer surface of the light-transmitting plate.

When the outer surface of the light-transmitting plate is configured to be convex, a light pressure is applied to the light-transmitting plate by simply applying the living body to the outer surface of the light-transmitting plate. Adhesion with the surface can be improved.

In the sensor unit, when the outer surface of the human body grounding terminal also projects from the surrounding portion, when the living body is pressed against the translucent plate, the living body surely contacts the human body grounding terminal. Even in this case, since the outer surface of the human body grounding terminal is located at a position lower than the outer surface of the translucent plate, it does not prevent the living body and the outer surface of the translucent plate from coming into close contact with each other.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration and a use state of an arm-mounted pulse wave information measuring device according to an embodiment of the present invention.

FIG. 2 is a plan view of a device body of the wrist-worn pulse wave information measuring device shown in FIG.

FIG. 3 is an explanatory view of the wristwatch-type pulse wave information measuring device shown in FIG. 1 when viewed from the 3 o'clock direction of the wristwatch.

FIG. 4 is a plan view of a sensor unit used in the wrist-worn pulse wave information measuring device shown in FIG.

5 is a cross-sectional view taken along the line II ′ of FIG.

6 is a cross-sectional view taken along the line II-II ′ of FIG.

7 is a cross-sectional view taken along the line III-III ′ of FIG.

8 is an explanatory diagram showing an emission spectrum of an InGaN-based blue LED used in the wrist-worn pulse wave information measuring device shown in FIG. 1. FIG.

9 is an explanatory diagram showing a light receiving characteristic of an InGaP-based phototransistor used in the wrist-worn pulse wave information measuring device shown in FIG. 1. FIG.

10 is an explanatory diagram showing a light receiving characteristic of a phototransistor unit with a filter used in the wrist-worn pulse wave information measuring device shown in FIG.

11 is an explanatory diagram showing a state in which the sensor unit used in the wrist-worn pulse wave information measuring device shown in FIG. 1 is worn on a finger by a band.

12 is a block diagram showing a function of a data processing circuit of the wrist-worn pulse wave information measuring device shown in FIG.

13 is an explanatory diagram showing an electrical connection relationship in a connector portion of the wrist worn pulse wave information measuring device shown in FIG.

FIG. 14 is an explanatory view showing the structure of a connector piece used in the connector portion of the wrist-worn pulse wave information measuring device shown in FIG.

15 is an explanatory diagram showing the structure of a connector portion used in the connector portion of the wrist-worn pulse wave information measuring device shown in FIG.

16 is a cross-sectional view showing a state in which the connector piece shown in FIG. 14 is attached to the connector portion shown in FIG.

17 (a) is a graph showing the relationship between the wavelength of light and the light transmittance of the skin, and FIG. 17 (b) is an explanatory view showing the relationship between the wavelength of light and the absorption characteristics of various hemoglobins. .

18 is an explanatory diagram showing an emission spectrum of a GaP-based LED that can be used in the wrist-worn pulse wave information measuring device shown in FIG. 1. FIG.

FIG. 19 is an explanatory diagram showing the light receiving characteristics of a GaAsP-based phototransistor that can be used in the wrist-worn pulse wave information measuring device shown in FIG. 1.

FIG. 20 is an explanatory diagram for explaining the effect of improving the adhesion between the finger and the transparent plate in the sensor unit of the wrist-worn pulse wave information measuring device shown in FIG. 1.

FIG. 21 is an explanatory diagram for explaining the effect of reducing the influence of stagnant blood from the signal detected by the phototransistor in the sensor unit of the wrist-worn pulse wave information measuring device shown in FIG. 1.

22 is a sensor unit having a structure in which a translucent plate is retracted by 0.2 mm from a reference surface as a comparative example in the wrist-worn pulse wave information measuring apparatus shown in FIG. 1, and the pressing force of the sensor unit on a finger 6 is a graph showing the results of evaluation of the relationship between the magnitude of the AC signal and the magnitude of the DC signal detected by the phototransistor.

23 is the same as the evaluation shown in FIG. 22, in a sensor unit having a structure in which a translucent plate is retracted by 0.2 mm from a reference surface as a comparative example in the wrist-worn pulse wave information measuring device shown in FIG. 1. 6 is a graph showing a result (relationship between the pressing force of the sensor unit on the finger and the magnitudes of the AC signal and the DC signal detected by the phototransistor) obtained from another experiment performed in FIG.

FIG. 24 is a graph showing a result of obtaining the relationship between the pressing force of the sensor unit on the finger and the ratio of the AC signal detected by the phototransistor to the DC signal from the results shown in FIG. 22.

25 is a sectional view of the wrist-worn pulse wave information measuring device shown in FIG. 1 in which a translucent plate is projected from the reference surface by 0.25 mm as a working example; 6 is a graph showing the relationship between the magnitude of the AC signal and the magnitude of the DC signal detected by the phototransistor.

26 is the same as the evaluation shown in FIG. 25 in a sensor unit having a structure in which a translucent plate is projected by 0.25 mm from the reference surface as an example in the wrist-worn pulse wave information measuring device shown in FIG. 1. 6 is a graph showing a result (relationship between the pressing force of the sensor unit on the finger and the magnitudes of the AC signal and the DC signal detected by the phototransistor) obtained from another experiment performed in FIG.

FIG. 27 is a graph showing the result of obtaining the relationship between the pressing force of the sensor unit on the finger and the ratio of the AC signal detected by the phototransistor to the DC signal, from the results shown in FIG. 25.

28 is a cross-sectional view of another sensor unit used in the wrist-worn pulse wave information measuring device shown in FIG.

29A is a sectional view of a sensor unit used in a conventional pulse wave information measuring device, and FIG. 29B is a sectional view of another sensor unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Arm mounting type pulse wave information measuring device (pulse wave information measuring device) 10 ... Device body 12 ... Wristband 13 ... Liquid crystal display device (display part) 20 ... Cable 30 ... -Sensor unit (pulse wave signal detection unit) 31 ... LED 32 ... Phototransistor 34 ... Transparent plate 36 ... Sensor frame 38 ... Human body grounding terminal 40 ... Sensor fixing band (Unit fixing means) 50 ... Data processing circuit 70 ... Connector section 80 ... Connector piece 300 ... Component storage space 341 ... Outer surface of light transmitting plate (contact surface with finger surface) 361 ... Outside surface of sensor frame (reference surface) 381 ... Outside surface of human body grounding terminal (contact surface with finger surface)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyuki Odagiri 1-8 Nakase, Nakase, Mihama-ku, Chiba City, Seiko Electronics Industry Co., Ltd.

Claims (5)

[Claims] 1. A light-emitting element that emits light toward the surface of a living body,
Of the light emitted by the light emitting element, a light receiving element capable of receiving the light reflected from the living body side, and a state in which the light receiving element and the light emitting element are arranged on the surface side and the living body surface is in close contact with the outer surface. A pulse wave signal detection unit including a translucent plate, a data processing unit that obtains pulse wave information based on a light reception result of the light receiving element, and a display for displaying the pulse wave information obtained by the data processing unit In a pulse wave information measuring device having a device body including a portion, when an outer surface around the light-transmitting plate in the pulse wave signal detecting unit is a reference plane, an outer surface of the light-transmitting plate is the reference. A pulse wave information measuring device, which is located at a position protruding from the surface. 2. The pulse wave information measuring device according to claim 1, wherein the outer surface of the transparent plate is a flat surface. 3. The pulse wave information measuring device according to claim 1, wherein the outer surface of the transparent plate is a convex surface. 4. The method according to any one of claims 1 to 3, further comprising: an outer surface of the pulse wave signal detecting portion around the light transmissive plate, the light transmissive plate being in close contact with a living body surface. A human body grounding terminal in contact with the surface of a living body, the outer surface of the human body grounding terminal being located at a position lower than the outer surface of the translucent plate and protruding from the reference surface. Wave information measuring device. 5. The wristband according to claim 1, further comprising: a wristband for attaching the device body to an arm; and a pulse wave signal detection unit extending from the device body, the pulse wave signal detecting unit being provided at a tip portion of the sensor unit. And a unit fixing means for attaching the sensor unit to a living body so that the outer surface of the transparent plate and the living body surface are in close contact with each other. .