JP4186374B2 - Pulse wave detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulse wave detection device using a sensor having a light emitting element and a light receiving element.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 11-56827 discloses a pulse wave detection device shown in the following conventional examples 1 and 2.
The pulse wave detection device of Conventional Example 1 is assembled to eyeglasses, and a photoelectric pulse wave sensor composed of an LED and a phototransistor is fixed to the earlobe.
The pulse wave detection device of Conventional Example 2 is formed by connecting a sensor unit worn on a finger and a device body having a wristwatch structure provided with an acceleration sensor for detecting a body motion waveform through lead wires, and output from the sensor unit. A body motion waveform is generated by removing the body motion waveform from the pulse wave waveform, and a wavelet transform is further applied to the body motion removal waveform to obtain a pulse wave.
[0003]
[Problems to be solved by the invention]
The pulse wave detection device of the above-described conventional example 1 is troublesome and troublesome to wear because it is necessary to fix the photoelectric pulse wave sensor to the earlobe.
In the pulse wave detection device of the above-described conventional example 2, the lead wire is an obstacle, and complicated waveform processing is required to obtain the pulse wave. In addition, an acceleration sensor is necessary and expensive.
[0004]
The purpose of the present invention is excellent in wearability, hardly is affected pulse wave facial expression is detected by changes can be grasped reliably change of very small light due to the pulse wave signal To provide a pulse wave detection device.
[0005]
[Means for Solving the Problems]
[About claim 1]
The pulse wave detection device uses a contact means to closely contact a temple with a light emitting element that irradiates light into the human body through the skin and a light receiving element that receives light returning from the inside of the human body and outputs a signal corresponding to the amount of light received. Let me detect the pulse wave of the human body.
The temple has few skin muscles (muscles that can move the skin), so even if the facial expression changes, the skin hardly moves and the sensor remains stationary. For this reason, it is difficult to affect the detected pulse wave even if the face expression changes.
For the close contact means, glasses, headphones, ear pads, hair bands or the like can be used.
The close contact means is a temple that is rotatably attached to a side portion of the lens frame of the glasses via a hinge.
The sensor arranged inside the temple is brought into close contact with the temple (or an area where both conditions are satisfied) by the force with which the temple rotates in the closing direction.
Since the pulse wave detection device has a configuration in which the sensor is arranged on the temple of the glasses, it is excellent in wearability and has little discomfort.
Most of the light returning to the light receiving element is reflected light reflected from the skin surface, and a very small amount (about 1/1000) is light caused by the pulse wave signal. It is necessary to adhere. Moreover, it is necessary to prevent light from the outside from entering the translucent body.
In the pulse wave detection device, the sensor includes: a light-receiving element, a light-receiving element, and a translucent body, a light-receiving element, a light-receiving element, and a light-transmitting body, which are fixed in a recess provided on the inner side of the temple and have a light-shielding property and stretchability that protrude inward toward the temple And a sensor main body that is located in the buffer material and has a translucent tip end surface protruding from the inner surface of the temple.
For this reason, when wearing spectacles, the concave periphery of the cushioning material is elastically deformed (collapsed) so that light from the outside does not enter the translucent body, and the front end surface of the translucent body protrudes from the inner surface of the temple Since it adheres to the skin, it is possible to reliably capture a very slight change in light caused by the pulse wave signal. Furthermore, since the shock applied to the glasses is absorbed by the buffer material, it is possible to prevent noise from being mixed into the pulse wave signal.
[0006]
[About claim 2]
The pulse wave detecting device is a temple between the outer eye corner point and the upper ear bottom point, and in the horizontal direction from a position 10 mm away from the outer eye corner point to the ear direction to the place where the hair on the temporal region grows. A light emitting element that irradiates light into the human body through the skin in a region in which both conditions of the vertical direction and the range of 10 mm above and below the straight line connecting the outer eye corner point and the upper ear base point are satisfied, A sensor having a light receiving element that receives the returning light and outputs a signal corresponding to the amount of light received is brought into close contact with the contact means to detect a pulse wave of the human body.
[0007]
It is a temple between the outer eye corner point and the upper ear base point. In the horizontal direction, the distance from the outer eye corner point to the ear direction is 10 mm to the place where the hair on the temporal region grows, in the vertical direction. In the region where both the upper and lower corners of the straight line connecting the outer eye corner point and the upper ear base point are satisfied, the skin is difficult to move even if the scolding or facial expression changes because there are few skin muscles. Maintain state. For this reason, it is difficult to affect the detected pulse wave even if the face expression changes.
For the close contact means, glasses, headphones, ear pads, hair bands or the like can be used.
[0008]
Dense Chakushudan is a temple pivotally mounted via a hinge on the side of the lens frame of eyeglasses, and the sensor is placed temple inside.
The sensor arranged inside the temple is in close contact with the temple (or an area where both conditions are satisfied) by the force with which the temple rotates in the closing direction.
Since the pulse wave detection device has a configuration in which the sensor is arranged on the temple of the glasses, it is excellent in wearability and has little discomfort.
Most of the light returning to the light receiving element is reflected light reflected from the skin surface, and a very small amount (about 1/1000) is light caused by the pulse wave signal. It is necessary to adhere. Moreover, it is necessary to prevent light from the outside from entering the translucent body.
In the pulse wave detection device, the sensor includes: a light-receiving element, a light-receiving element, and a translucent body, a light-receiving element, a light-receiving element, and a light-transmitting body, which are fixed in a recess provided on the inner side of the temple and have a light-shielding property and stretchability that protrude inward toward the temple And a sensor main body that is located in the buffer material and has a translucent tip end surface protruding from the inner surface of the temple.
For this reason, when wearing spectacles, the concave periphery of the cushioning material is elastically deformed (collapsed) so that light from the outside does not enter the translucent body, and the front end surface of the translucent body protrudes from the inner surface of the temple Since it adheres to the skin, it is possible to reliably capture a very slight change in light caused by the pulse wave signal. Furthermore, since the shock applied to the glasses is absorbed by the buffer material, it is possible to prevent noise from being mixed into the pulse wave signal.
[0009]
[About claim 3 ]
When the carotid artery moves (such as turning its neck), blood flow changes due to factors other than pulsation.
That is, the changes in blood flow in the left and right carotid arteries are contradictory. For example, when the blood flow in the right carotid artery increases due to neck movement, the blood flow in the right carotid artery decreases.
If the sensor is arranged only inside one temple, the pulse cannot be obtained with high accuracy from the pulse wave detected from one temple.
However, since the pulse wave detection device according to claim 3 has a configuration in which sensors are arranged inside both the temples and detects the pulse wave of the human body based on the signal output from each light receiving element, the pulse wave can be detected even if the neck moves. Can be obtained with high accuracy.
[0012]
[About claim 4 ]
A structure in which the width between the temples at the time of maximum opening is narrower than the width of the head and the temples are urged in the closing direction by the elasticity of the temples themselves, or the temples are urged in the closing direction by an elastic body attached to the hinge. If added to the pulse wave detection device according to any one of claims 1 to 3, the distal end surface of the translucent body can be securely adhered to the skin.
By adding a structure for fixing each end of the temple glasses back of the head connects with stretchable bands pulse wave detecting apparatus according to claim 1 to 3, can be prevented that would move glasses by the movement of the wearer, the pulse wave Can be detected stably.
By adding a lens frame nose pad to the pulse wave detection device according to claims 1 to 3 , the movement of the face and head can be prevented from being directly transmitted to the glasses, and the pulse wave can be detected stably. it can.
[0013]
[About Claim 5 ]
Pulse wave detecting apparatus, or the signal of the light receiving element via the transmission means provided in place of the glasses is transmitted wirelessly notifying the analysis of pulse wave is performed in the analysis device, or provided in place of the glasses The signal of the light receiving element is analyzed by the analyzing unit, and the analysis result is notified by the notifying unit provided on the lens frame or the lens.
For this reason, the wearer and the monitor can easily grasp the analysis result of the detected pulse wave.
[0014]
[About claim 6 ]
The pulse wave detection device includes: a light emitter that performs one or more of changing a light emission intensity, changing a light emission color, and changing a blinking period to notify an analysis result of a pulse wave; An informing means is constituted by a light guide that guides light to a predetermined position and scatters it in the viewing direction.
For this reason, the wearer can easily grasp the analysis result of the detected pulse wave by the light scattered in the visual field direction.
[0015]
[About claim 7 ]
The pulse wave detection device according to any one of claims 1 to 6 , wherein the notification means provided at an appropriate position of the glasses includes navigation-related information, weather-related information, human body diagnosis-related information, environment-related information, in addition to an analysis result obtained by analyzing the pulse wave. Since the information transmitted wirelessly from the portable device that receives or detects one or more of the teletext related information is notified, it is excellent in convenience.
The navigation related information includes altitude, travel distance, current position, expected arrival time, road congestion, and the like.
The weather-related information includes temperature, humidity, atmospheric pressure, and wind speed.
The human body diagnosis related information includes body temperature, calorie consumption, fatigue level, blood lactate level, blood glucose level, blood pressure, and the like.
The environment-related information includes pollen scattering degree, fine particle concentration, photochemical smog concentration, solar radiation amount, and the like.
The teletext related information is information from a visible radio or the like.
[0016]
An embodiment of the present invention (corresponding to claims 1 to 6 ) will be described with reference to FIGS.
As shown in FIG. 1, the pulse wave detection device A includes a lens frame 1 and a temple 3 that is rotatably attached to a side portion of the lens frame 1 via a hinge 2 and takes the form of glasses. .
[0017]
The lens frame 1 (made of plastic) is formed by connecting lens frames 11 and 12 on which lenses 111 and 121 are mounted with a connecting piece 13.
Sponge pads 112 and 122 are provided on the nose pads of the lens frames 11 and 12. Further, a display device 6 to be described later is disposed in a recess formed in the lower part of the left lens frame 12.
[0018]
The hinge 2 has a recess with a screw hole and is fixed to the end of the lens frame 1, a hinge piece with a screw hole that fits into the recess and is fixed to the temple 3, and the bearing and hinge It consists of a screw (none of which is shown) for pivotally mounting the piece.
[0019]
The temples 3 and 3 (made of plastic) having a plate shape have a wide base end 31 on which the sensors 5 and 5 are disposed and are attached to the lens frames 11 and 12 via the hinges 2, and rubber for fixing the glasses to the back of the head. Bands 4 and 4 (stretchable bands) are attached to the tip 32.
[0020]
In this embodiment, the width between the temples at the time of maximum opening is made narrower than the width of the head, and the force of the temples 3, 3 itself is biased in the closing direction by the elasticity of the temples 3, 3 themselves. The light body 525 is in close contact with the region 7 described later.
Further, at the proximal end 31 in the vicinity of the hinge 2, a signal processing circuit for synthesizing and averaging the pulse wave signals {(a) and (b)} in FIG. 4 output from the light receiving elements 523 and 523, and the processed pulse A control unit that analyzes the wave signal {(c) of FIG. 4}, a drive circuit that drives the display device 6 based on the analysis result, and a battery that stores operating power (none of which is shown) ) Is arranged.
[0021]
The sensor 5 is composed of a black sponge 51 (buffer material) having a light-shielding property and stretchability and a sensor main body 52, and is disposed one by one in the recesses 50 of the left and right temples 3 and 3 (FIG. 2, FIG. (See FIG. 3).
The sponge 51 having a concave cross section has a rectangular bottom portion 511 and a side wall portion 512 standing from the bottom portion 511 and protruding from the temple inner surface 30 and the distal end surface 526 (1 mm or more from the distal end surface 526).
The sensor main body 52 molded in the light-shielding resin 520 includes a light emitting element 522 and a light receiving element 523 disposed on the substrate 521, an optical filter 524, and a light transmitting body 525, and a distal end surface of the light transmitting body 525. 526 is mounted in the sponge 51 so as to protrude from the inner surface 30 of the temple.
[0022]
This translucent body 525 has a vertex height (preferable range of 0.5 mm to 2.0 mm) of 1 mm, a width of 3 mm, a length of 6 mm, and a semi-elliptical cross section (see FIG. 3).
And it is a temple between the outer eye corner point 71 and the upper ear bottom point 72, from the place 10mm away from the outer eye corner point 71 in the horizontal direction to the place where the hair on the temporal region grows. In the vertical direction, the translucent body 525 is in close contact with the skin in the region 7 (see FIG. 5) where both the conditions of the upper and lower ranges of 10 mm above and below the straight line connecting the external eye corner point 71 and the upper ear base point 72 are satisfied.
[0023]
The light-emitting element 522 is a light-emitting diode that emits blue light (350 nm to 600 nm). Light emitted from the light emitting element 522 passes through the optical filter 524 and the light transmitting body 525 and enters the human body through the skin of the temple.
The light receiving element 523 is a phototransistor having a main sensitivity region of 300 nm to 600 nm, and receives light returning from the inside of the human body through the light transmitting body 525.
The optical filter 524 is a filter that can cut 98% or more of light in the wavelength range of 700 nm to 1100 nm.
[0024]
As shown in FIG. 6, the display 6 includes a light emitting element 62 and a light guide 63 having a ground surface 631 in a housing 61 having a concave cross section. Moreover, the structure shown in FIG. 7 may be sufficient.
In this embodiment, based on the analysis result analyzed by the analysis circuit, the blinking cycle of the light emitting element 62 is changed in three stages (small, normal range, large) and the pulse rate is reported (low, normal range, large). Yes.
The electrical connection between the sensor 5, the display 6, and the control unit is made through a lead wire passing through the lens frame 1 and the temple 3.
[0025]
The pulse wave detection device A of the present embodiment has the following advantages.
[A] The pulse wave detection device A is a temple between the outer eye corner point 71 and the upper ear base point 72, and in the horizontal direction from the outer eye corner point 71 at a distance of 10 mm in the ear direction from the temporal region. The translucency of the sensor 5 passes through the skin in the region 7 where both the condition where the hair grows and the vertical direction is 10 mm above and below the straight line connecting the outer eye corner point 71 and the upper ear bottom point 72 are satisfied. The body 525 is in close contact.
Since the skin in the region 7 has few skin muscles, even if the facial expression changes, the skin does not move easily, and the sensor 5 remains stationary. Therefore, the detected pulse wave is affected even if the facial expression changes. It is difficult to output and the pulse wave can be accurately measured.
[0026]
[A] Since the pulse wave detection device A is in the form of glasses, it is easy to attach and detach, and it is difficult to feel bothersome.
Further, the translucent body 525 that hits the skin in the region 7 has a vertex height of 1 mm, a width of 3 mm, a length of 6 mm, and a semi-elliptical cross section, so that the wearer does not feel a sense of pressure or discomfort.
[0027]
[C] The pulse wave detection device A uses the force 300 that urges the temples 3 and 3 in the closing direction by the elasticity of the temples 3 and 3 by making the width between the temples at the time of maximum opening narrower than the width of the head. is doing.
For this reason, the transparent body 525 of the sensor 5 can be brought into close contact with the region 7 with a simple configuration.
[0028]
[D] In the pulse wave detection device A, the sensors 5 and 5 are arranged inside both temples, the signal processing circuit synthesizes the pulse wave signal {(a), (b)} in FIG. 4 with the light receiving elements 523 and 523. Then, the analysis circuit analyzes the pulse wave signal {(c) in FIG. 4} averaged and processed, and the drive circuit drives the display 6 based on the analysis result.
For this reason, even if the wearer performs a movement that compresses the carotid artery, such as turning the neck, the pulse can be accurately obtained even if the blood flow of the left and right carotid arteries changes in the opposite direction.
[0029]
[E] In the pulse wave detection device A, the sensor main body 52 is attached to the bottom 511 of a black sponge 51 (buffer material) having light shielding properties and stretchability.
When the spectacles are attached, the side wall portion 512 of the sponge 51 is elastically deformed (collapsed) and covers the light transmitting body 525, so that light from the outside does not enter the light transmitting body 525.
And since the front-end | tip surface 526 of the translucent body 525 which protruded from the inner surface 30 of a temple closely_contact | adheres to skin, the very slight change of light resulting from a pulse wave signal can be caught reliably. Furthermore, since the shock applied to the glasses is absorbed by the sponge 51, it is possible to prevent noise from being mixed into the pulse wave signal.
[0030]
[F] The pulse wave detection device A attaches rubber bands 4 and 4 for fixing the glasses to the back of the head to the tip 32 of the temple 3 so that the glasses can be fixed to the back of the head.
For this reason, since it can prevent that spectacles shift | deviate in the front-back direction by a wearer's motion, a pulse wave can be detected stably.
[0031]
[G] In the pulse wave detection device A, sponge pads 112 and 122 are provided on the nose pads of the lens frames 11 and 12.
For this reason, since the movement of the face and head is not directly transmitted to the glasses, the pulse wave can be detected stably.
[0032]
[H] The pulse wave detector A has the indicator 6 disposed in a recess formed in the lower part of the left lens frame 12, and changes the blinking cycle of the light emitting element 62 in three stages (small, normal range, large). The pulse rate is reported (low, normal range, high).
For this reason, the wearer can easily know whether or not his / her pulse rate is within the normal range.
Further, since it is configured to emit light within the field of view, it can be easily recognized even during exercise, so it can be used for pulse management during exercise.
[0034]
b. The structure may be such that the temple 3 is biased in the closing direction by an elastic body such as a coil spring attached to the hinge 2 (corresponding to claim 4 ).
[0035]
c. A light emitter that performs one or more of changing the emission intensity, changing the emission color, and changing the blinking period to notify the analysis result of the pulse wave, and guiding the light of the light emitter to a predetermined position Further, the notification means may be constituted by a light guide that scatters in the viewing direction (corresponding to claim 5 ). A part of the lens may be used for the light guide.
[0036]
d. The signal of the light receiving element may be wirelessly transmitted to the analysis device via a transmission means provided at an appropriate position of the spectacles to analyze and notify the pulse wave (corresponding to claim 5 ).
[0037]
e. The notification means provided at the appropriate place of the glasses receives at least one of navigation-related information, weather-related information, human body diagnosis-related information, environment-related information, and teletext-related information in addition to the analysis result obtained by analyzing the pulse wave. Alternatively, information transmitted wirelessly from the portable device to be detected may be notified.
When the amount of information is large, it is desirable to have a configuration in which an image of a liquid crystal panel provided at an appropriate position of the glasses is projected directly or onto a lens and put in the field of view.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pulse wave detection device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a sensor used in the pulse wave detection device.
FIG. 3 is an explanatory diagram showing the structure of a sensor used in the pulse wave detection device.
4A is a pulse wave signal output from the right light receiving element, FIG. 4B is a pulse wave signal output from the left light receiving element, and FIG. 4C is a graph of the pulse wave signal processed by the signal processing circuit. It is.
FIG. 5 is an explanatory diagram for explaining a region;
FIG. 6 is an explanatory diagram showing a structure of a display device.
FIG. 7 is an explanatory diagram showing another structure of the display device.
[Explanation of symbols]
A Pulse wave detector 1 Lens frame 2 Hinge 3 Temple 4 Rubber band (stretchable band)
5 Sensor 6 Display (notification means)
50 recess 51 sponge (buffer material)
52 Sensor body 62 Light-emitting element (light-emitting body)
63 Light Guide 522 Light Emitting Element 523 Light Receiving Element 525 Translucent Body 526 Front End Surface (Translucent Body Front End Surface)

Claims (7)

A pulse wave of the human body is obtained by closely contacting a sensor with a light emitting element that irradiates light into the human body through the skin and a light receiving element that receives light returning from the inside of the human body and outputs a signal according to the amount of light received by the contact means. a pulse wave detection device for detecting,
The contact means is a temple that is rotatably attached to a side portion of the lens frame of the glasses via a hinge,
The sensor disposed inside the temple is fixed to a recess provided inside the temple, and has a light-blocking material having a light-shielding property and stretchability that protrudes toward the inside of the temple, and the light-emitting element, the light-receiving element, and the light-transmitting element. A sensor body that has a light body and is located in the buffer material, and the front end surface of the translucent body protrudes from the inner side surface of the temple. A pulse wave detection device characterized by closely contacting. It is a temple between the outer eye corner point and the upper ear bottom point, and in the horizontal direction, from a position 10 mm away from the outer eye corner point in the ear direction to a place where the hair on the temporal region grows, in the vertical direction. Is a region where both the conditions of the upper and lower 10 mm of the straight line connecting the outer eye corner point and the upper ear base point are satisfied,
A sensor having a light emitting element that emits light to the inside of the human body through the skin and a light emitting element that receives light returning from the inside of the human body and outputs a signal corresponding to the amount of received light is brought into close contact with the contact means to detect a pulse wave of the human body A pulse wave detecting device ,
The contact means is a temple that is rotatably attached to a side portion of the lens frame of the glasses via a hinge,
The sensor disposed inside the temple is fixed to a recess provided inside the temple, and has a light-blocking material having a light-shielding property and stretchability that protrudes toward the inside of the temple, and the light-emitting element, the light-receiving element, and the light-transmitting element. A sensor body that has a light body and is located in the buffer material, and the front end surface of the translucent body protrudes from the inner side surface of the temple. A pulse wave detection device characterized by closely contacting. Place the sensor inside both temples,
The pulse wave detection device according to claim 1 or 2, wherein a pulse wave of a human body is detected based on a signal output from each light receiving element . A structure in which the width between the temples at the time of maximum opening is narrower than the width of the head and the temples are urged in the closing direction by the elasticity of the temples themselves, and the temples are urged in the closing direction by an elastic body attached to the hinge 4. One or more of a configuration in which each end of the temple is connected by an elastic band and the glasses are fixed to the back of the head or a nose pad of the lens frame is used as a pad. 5. pulse wave detection device. Whether the signal of the light receiving element is wirelessly transmitted to the analysis device via a transmitting means provided at an appropriate position of the spectacles, and pulse wave analysis and notification are performed,
The pulse according to any one of claims 1 to 4, wherein a signal of the light receiving element is analyzed by an analysis unit provided at an appropriate position of the spectacles, and an analysis result is notified by a notification unit provided on the lens frame or the lens. Wave detector. A light emitter that performs one or more of changing the light emission intensity, changing the light emission color, and changing the blinking period to notify the analysis result of the pulse wave; and the light of the light emitter at a predetermined position The pulse wave detection device according to claim 5, wherein the notification means is configured by a light guide that guides the light up to and scatters in the viewing direction . In addition to the analysis result of analyzing the pulse wave, the notification means provided at the right place of the glasses
The information transmitted wirelessly from a portable device that receives or detects one or more of navigation-related information, weather-related information, human body diagnosis-related information, environment-related information, and teletext- related information. Item 7. The pulse wave detection device according to any one of Items 6 to 7 .

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