JPH11332838A - Heartbeat sensor, human body detection sensor provided with the same, and human body abnormality detection sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit a measurer himself to count a heart rate without trying to measure consciously by providing an optical signal transmission means that varies the transmission condition of optical signals in accordance with vibration based on the heartbeats so as to detect heartbeat data concerning heartbeat on the basis of the transmission condition of optical signals. SOLUTION: Optical signals in a heartbeat sensor S propagate near the surface of an optical waveguide 1c. Therefore, if a disturbance member 2 approaches, as it brings about a change in the distribution of refractive indexes near the optical waveguide 1c, altering the propagation condition of the optical signals, a loss occurs in propagating optical signals. As this loss changes on the basis of the relative physical relationship between the disturbance member 2 and the optical waveguide 1c, vibration causing a change in loss can be detected on the basis of the propagation condition of the optical signals, thereby enabling a measurer himself to count a heart rate without attaching consciously a heartbeat counter to his finger or wrist by attaching appropriately the heartbeat sensor S to a part which conveys vibration based on heartbeats.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heart rate sensor, a human body detecting sensor provided with the same, and a human body abnormality detecting sensor.

[0002]

2. Description of the Related Art Heretofore, as a heart rate sensor of this type, there is a sensor attached to a skin surface such as a finger or a wrist. This device includes a light emitting element that emits light toward the skin surface, and a light receiving element that receives light reflected by the skin surface, and measures the intensity of the reflected light received by the light receiving element. Then, the flow state of blood flowing through a blood vessel near the skin surface is detected, and the heart rate is counted based on the flow state of the blood.

[0003]

In the above-described heart rate sensor, unless the measurer who is trying to count the heart rate is conscious of counting the heart rate, it is placed on the skin surface such as a finger or a wrist. Since it cannot be installed, if it is troublesome to install, or if you forget to install it suddenly, you will not be able to count your heart rate.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to be able to count the heart rate even if the measurer himself is not conscious of counting the heart rate. It is to provide a heart rate sensor.

[0005]

According to a first aspect of the present invention, there is provided a heart rate sensor comprising an optical signal transmitting means for changing a transmission state of an optical signal in response to a vibration based on a heartbeat. In this configuration, the heart rate data relating to the heart rate is detected based on the transmission state of the optical signal.

According to a second aspect of the present invention, in the heart rate sensor according to the first aspect of the present invention, the optical signal transmitting means propagates an optical signal emitted by the light emitting element and causes the light receiving element to receive the light signal. And a disturbance member having a refractive index of 1 or more and changing a relative positional relationship with the optical waveguide in accordance with the vibration.

A heart rate sensor according to a third aspect of the present invention is the heart rate sensor according to the second aspect of the present invention, wherein the light emitting element, the light receiving element, and the optical waveguide are arranged on the same member with a predetermined relative positional relationship. It has a set configuration.

A heartbeat sensor according to a fourth aspect of the present invention is the heartbeat sensor according to the second or third aspect of the present invention, wherein the vibration member reciprocates in both directions across a reference point due to the vibration. Among them, a configuration is provided in which a restricting means for restricting the operation to only one side from the reference point is provided.

The heart rate sensor according to a fifth aspect of the present invention is the heart rate sensor according to the first aspect of the present invention, wherein the optical signal transmitting means includes a first optical waveguide for transmitting an optical signal, a first optical waveguide, And a second optical waveguide whose relative positional relationship with the first optical waveguide changes in accordance with the vibration by optically coupling and transmitting an optical signal.

A heart rate sensor according to a sixth aspect of the present invention is the heart rate sensor according to the first aspect of the present invention, further comprising an elastic member having an elastic surface on an outer surface which expands and contracts with the vibration. The configuration is such that the deformable member is disposed along a plane.

A heart rate sensor according to a seventh aspect of the present invention is the heart rate sensor according to the sixth aspect of the present invention, further comprising a telescopic member having a telescopic surface that expands and contracts in accordance with the vibration on an outer surface. The configuration is such that the deformable member is disposed along a plane.

[0012] The human body detection sensor according to the invention described in claim 8 is:
A detection unit comprising the heart rate sensor according to any one of claims 1 to 7, and a determination unit that determines the presence or absence of a human body based on heart rate data on the heartbeat detected by the detection unit and outputs a detection signal. It has a configuration with.

According to a ninth aspect of the present invention, there is provided a human body abnormality detecting sensor according to the first to seventh aspects of the present invention, based on a heart rate sensor based on the heart rate data detected by the detecting section. And an abnormality determining unit that determines whether an abnormality is present in a predetermined state and outputs a warning signal.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heart rate sensor S according to a first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 1 denotes a printed circuit board, on its surface, a light-emitting element 1a, a light-emitting condenser mirror 1b, an optical waveguide 1c, a light-receiving element 1d, and a light-receiving condenser mirror 1.
e, an amplifier 1f, a filter 1g, and a microcomputer 1h are mounted and mounted. Specifically, the optical waveguide 1c is
It is formed by molding.
Are formed simultaneously. The optical waveguide 1c is provided by being adhered to the printed circuit board 1. When forming the printed circuit board 1, the optical waveguide 1c is formed by forming a transparent resin thinly and uniformly on a part of the surface by spin coating, and forming a grating 1j with a photoresist or the like. May be done. In a state where the disturbance member 2 having a refractive index of 1 or more is superimposed on the optical waveguide 1c, the distance between the optical waveguide 1c and the optical waveguide 1c changes according to external vibration such as a heartbeat. It is provided to change the positional relationship. The disturbance member 2 constitutes, together with the optical waveguide 1c, an optical signal transmission unit 3 in which the transmission state of the optical signal changes according to the vibration based on the heartbeat. In addition, examples of the disturbance member 2 include acrylic resin, polycarbonate, styrene, and glass.

Next, the propagation of an optical signal will be described. The light-emitting element 1a is an optical signal.
Due to 1b, the light is reflected toward one end of the optical waveguide 1c. Since the optical waveguide 1c has the grating 1j at one end, the optical waveguide 1c efficiently receives an optical signal from the light emitting element 1a and propagates the received optical signal to the other end. Since the optical waveguide 1c is also provided with a grating 1j at the other end, it is directed toward the light-receiving condenser mirror 1e composed of a concave mirror.
Efficiently irradiates the propagated optical signal, and the light receiving mirror
The optical signal reflected by 1e is received by the light receiving element 1d.

As described above, the optical signal is propagated by the optical waveguide 1c. More specifically, the optical signal is propagated near the surface of the optical waveguide 1c, and slightly propagates outwardly. I have. Therefore, when the disturbance member 2 approaches, for example, about 10 μm, the refractive index distribution in the vicinity of the optical waveguide 1c changes, and the propagating optical signal is affected by the refractive index distribution. Since the state changes, a loss occurs in the propagating optical signal. This loss is caused by the disturbance member 2 and the optical waveguide 1c.
Changes based on a change in the relative positional relationship between the optical waveguide 1c and the optical signal,
Vibration that causes such a change in loss can be detected.

Next, the signal processing will be described with reference to FIG. First, the light emitting element 1a is driven by a current by a light emitting circuit (not shown) to emit light, and as described above, an optical signal is propagated by the optical waveguide 1c and an optical signal is received by the light receiving element 1d. Next, the current based on the optical signal received by the light receiving element 1d is converted into a voltage signal by a current-voltage conversion circuit (not shown). Next, the voltage signal is amplified by the amplifier circuit in the amplifier 1f,
The filter circuit within 1g performs detection for extracting a heartbeat signal through filtering for removing disturbance noise.

Next, the heartbeat signal will be described with reference to FIG. The heartbeat signal indicated by the solid line is obtained when the present heartbeat sensor S is embedded in the place where the buttocks are placed on the chair, and includes a frequency component of 3 to 5 per second. Then, the dotted line 1 which is the envelope of the heartbeat signal
Since the cycle corresponds to the heartbeat, the waveform of the heartbeat signal is represented by A
When the signal is converted into a digital signal and input to the microcomputer 1h, the microcomputer 1h analyzes the signal waveform and counts the heart rate, which is one of the heart rate data relating to the heart rate.

The signal (S) / noise (N) is obtained by modulating the light emitting element 1a at a certain frequency and amplifying only the modulated frequency component, instead of driving the light emitting element 1a with a direct current. The ratio can be increased, and a heartbeat signal can be extracted even when ambient noise is large.

In the heart rate sensor S, heart rate data relating to heart rate is detected based on the transmission state of an optical signal whose transmission state changes in response to vibration based on the heart rate. By attaching it appropriately to the part where the vibration based on the heartbeat is transmitted,
The heart rate can be counted even if the measurer himself is not conscious of counting the heart rate and attaches it to the finger or wrist of the human body.

When the relative position of the disturbance member 2 having a refractive index of 1 or more with respect to the optical waveguide 1c changes according to the vibration,
Since the propagation state of the optical signal in the optical waveguide 1c fluctuates and the transmission state of the optical signal changes, it is possible to detect the heartbeat data on the heartbeat based on the transmission state of the optical signal.

By installing the printed circuit board 1 on which the light emitting element 1a, the light receiving element 1d, and the optical waveguide 1c are disposed, the light emitting element 1a, the light receiving element 1d, and the optical waveguide 1c are not separately installed. This facilitates the installation work, and the relative positional relationship between the light emitting element 1a, the light receiving element 1d, and the optical waveguide 1c is a predetermined positional relationship, so that variations in characteristics can be suppressed.

Next, a heart rate sensor according to a second embodiment of the present invention.
S will be described below with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and only different points from the first embodiment will be described. This embodiment is basically the same as the first embodiment, except that the reciprocating movement of the disturbance member 2 in both directions with respect to the reference point due to vibration includes one direction from the reference point to the optical waveguide 1c side. The configuration is such that a restricting member 4 (restricting means) for restricting only the side operation is provided.

More specifically, the printed circuit board 1 is made of, for example, M
The condenser mirrors 1b and 1e are integrally formed, and a support 1k for supporting the disturbance member 2 is erected by integral molding. This support
A restricting member 4 abutting against the disturbance member 2 extends from the tip of 1k so as to restrict the operation of the disturbance member 2 to only the operation in one direction, which is the optical waveguide 1c side.

Since the operation of the disturbance member 2 is restricted by the above-described restricting member 4, the cushion 6 connected to the vibration applying member 5 connected to the disturbance member 2 is used.
When a vibration based on a heartbeat is applied to the optical waveguide 1c, it is displaced only in a direction in which the distance between the optical waveguide 1c and the optical waveguide 1c is shortened from the state of being in contact with the limiting member 4. The heart rate sensor S is supported on a cushioning member 7 such as a spring for absorbing the external force of the person sitting on the cushion 6 so as to absorb the external force consisting of the weight of the person sitting on the cushion 6 and the slow motion so as not to be transmitted to the disturbance member 2. I have.

In such a heart rate sensor S, in addition to the effect of the first embodiment, the disturbance member 2 is restricted by the restriction member 4 to only the operation in one direction from the reference point, so that the disturbance member 2 is unique to vibration. By the reciprocating motion, the timing is always reset to the reference point even when the operation is performed in the other direction from the reference point, so that the accuracy of the distance to the optical waveguide 1c can be increased.

Further, the printed circuit board 1 has both converging mirrors.
Since the parts 1b, 1e and the support part 1k are provided by integral molding, variations in arrangement can be reduced.

Next, a human body detection sensor S1 incorporating the heart rate sensor S will be described with reference to FIG. The human body detection sensor S1 is, for example, incorporated in a bed, and includes a detection unit 8 and a detection unit including the heart rate sensor S described above.
A judgment circuit (judgment unit) 9 for judging the presence or absence of a human body based on the heartbeat data from the computer 8 is provided.

More specifically, the determination circuit 9 determines the presence or absence of a human body based on the presence or absence of a heartbeat signal, which is heartbeat data, and the vibration caused by the heartbeat. That is, when there is no heartbeat signal, there is naturally no human body, and the vibration due to the heartbeat always contains a frequency component of 3 to 5 per second, so this frequency component is included. If not, it is determined that the human body does not exist. Also, the envelope of the heartbeat signal is
As described above, since it is periodic, it is determined that no human body exists even when it is not periodic. And the judgment circuit 9
Outputs a detection signal indicating the determination result after determining the presence or absence of a human body.

In the human body detection sensor S1, since the heart rate data detected by the detection unit 8 including the heart rate sensor S is unique to the human body, the determination unit determines the human body based on the heart rate data. By judging the presence or absence,
The presence or absence of a human body can be detected with high reliability.

By incorporating this human body detection sensor S1 into a seat of a performance facility such as a vehicle or a movie theater, it is possible to detect the vacancy status, and by incorporating it into a seat of a sightseeing bus for group travel, It is possible to ascertain the number of staff and to ascertain the patient's in-bed status by incorporating it into a bed in a hospital ward.

Next, a human body abnormality detection sensor S2 incorporating the heart rate sensor S will be described with reference to FIGS. The human body abnormality detection sensor S2 is, for example, incorporated in a driver's seat of an automobile, and detects a human body in a predetermined state based on the heartbeat data from the heartbeat sensor S and the heartbeat sensor S described above. An abnormality determination circuit (abnormality determination unit) 10 that determines whether or not an abnormality is detected with respect to the vehicle.

More specifically, the abnormality determination circuit 10 detects the state of the driver's heart based on the heart rate, which is the heart rate data, to detect abnormal changes in the physical condition of the driver, and does not drive asleep. Determine whether or not. In other words, when the heart rate fluctuates rapidly or when the heart rate fluctuates beyond the upper limit, it is determined that the heart rate is abnormal due to a nervous state or sudden illness, and when the heart rate exceeds the lower limit. Determines that there is a possibility that the driver is dozing off.

The abnormality determination circuit 10 includes a distance measuring sensor
Abnormality detection is started by a human body detection signal output from a human body detection sensor S5 such as S3 or an ultrasonic sensor S4. Then, after determining that the human body is abnormal with respect to the predetermined state, the determination circuit 9 outputs a warning signal by voice or screen display, or applies vibration for awakening when driving while falling asleep. If it is determined that the vehicle is abnormal enough to feel dangerous, a signal is output to the emergency brake 11 of the vehicle to stop the vehicle automatically.

The human body abnormality detection sensor S2 is configured such that the heart rate data detected by the detection unit 8 comprising the heart rate sensor S is:
Since the abnormality is surely changed when the human body is abnormal, the abnormality determination circuit 10 determines whether or not the human body is abnormal with respect to a predetermined state based on the heartbeat data. Can be detected with high reliability.

Next, a heart rate sensor according to a third embodiment of the present invention.
S will be described below with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and only different points from the first embodiment will be described. In the first embodiment, the optical signal transmission means 3 includes an optical waveguide 1c that propagates an optical signal emitted by the light emitting element 1a and causes the light receiving element 1d to receive the light signal, and an optical waveguide 1c having a refractive index of 1 or more and according to vibration. And a disturbance member 2 whose relative positional relationship changes with the first optical waveguide 1m that propagates an optical signal in the present embodiment. A second optical waveguide 1n that optically couples with the first optical waveguide 1m, propagates an optical signal, and changes a relative positional relationship with the first optical waveguide 1m according to vibration;
Is provided.

More specifically, this device changes the relative positional relationship between the first optical waveguide 1m and the second optical waveguide 1n, which propagates an optical signal, by vibration based on a heartbeat. Heart rate data is detected based on a change in the optical coupling state of the optical signal between the optical paths 1m and 1n, and a change in the propagation state of the optical signal between the optical waveguides 1m and 1n. The optical coupling of the optical signal between these two optical waveguides 1m and 1n is
This is achieved by optical coupling between gratings 1j provided in 1m and 1n.

In this heart rate sensor S, as in the first embodiment, by appropriately attaching the heart rate sensor to the portion where the vibration based on the heartbeat is transmitted, the measurer can measure the heart rate by himself / herself. The heart rate can be counted without being conscious of counting and attaching it to the finger or wrist of the human body.

When the relative positional relationship between the first optical waveguide 1m and the second optical waveguide 1n changes according to the vibration based on the heartbeat, the first optical waveguide 1m and the second optical waveguide 1m change. Since the optical coupling state between 1n and 1n changes, the propagation state of the optical signal in both waveguides 1m and 1n fluctuates and the transmission state of the optical signal changes, so based on the transmission state of the optical signal, Heart rate data on the heart rate can be detected.

Further, the grating 1j is an element whose optical coupling state changes even if the position is slightly changed.
By optically coupling an optical signal between such elements,
A change in heart rate data based on a change in the optical coupling state can be detected with high accuracy.

Next, a heart rate sensor according to a fourth embodiment of the present invention.
S will be described below with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and only different points from the first embodiment will be described. In the first embodiment, the optical signal transmission means 3 includes an optical waveguide 1c for transmitting an optical signal emitted by the light emitting element 1a and causing the light receiving element 1d to receive the light signal.
And a disturbance member 2 whose refractive index is 1 or more and whose relative positional relationship with the optical waveguide 1c changes according to vibration, whereas the present embodiment transmits an optical signal. Optical fiber 13, deformable member 12 that deforms fiber 13 by being displaced based on vibration so as to change the propagation state of an optical signal
And a configuration having:

More specifically, in this cable, an optical fiber 13 through which an optical signal is propagated is housed in the groove 14a of a cable 14 provided with a groove 14a along the longitudinal direction.
A cable 14 containing 13 is spread on the surface of the sheet 15. The optical fiber is inserted into the groove 14a of the cable 14.
In addition to 13, a deformable member 12 made of beads is housed together, and when a load is applied to the cable 14, a groove 14 is formed.
When the deformable member 12a is displaced, microbending, which is a form of deformation, occurs in the optical fiber 13, and the propagation state of the optical signal in the optical fiber 13 changes.

This is because the deformable member 12 is displaced based on the vibration based on the heartbeat, and the optical fiber 13 is displaced by the displacement.
, The heartbeat data is detected based on the change in the propagation state of the optical signal in the optical fiber 13.

In this heart rate sensor S, as in the first embodiment, the measurement person himself / herself can measure the heart rate by appropriately attaching the part to which the vibration based on the heartbeat is transmitted among the parts contacted by the human body. The heart rate can be counted without being conscious of counting and attaching it to the finger or wrist of the human body.

When the deformable member 12 deforms the optical fiber 13 in response to the vibration, the propagation state of the optical signal in the optical fiber 13 changes, and the transmission state of the optical signal changes. Heart rate data relating to the heart rate can be detected based on the transmission state.

Next, a human body abnormality detecting sensor S2 incorporating the heart rate sensor S will be described with reference to FIGS. The human body abnormality detection sensor S2 is provided, for example, as a toilet seat 15a and a floor sheet 15b of a Western-style toilet, and includes a detection unit 8 including the heart rate sensor S described above.
An abnormality judging circuit (abnormality judging unit) 10 for judging whether or not the human body is abnormal with respect to a predetermined state based on the heartbeat data from the detecting unit 8 is provided.

More specifically, the abnormality determination circuit 10 detects the health condition of the human body in the toilet based on the heart rate as the heart rate data, and a sudden change in the physical condition of the human body in the toilet occurs. Determine if not. That is,
If the heart rate fluctuates rapidly or the heart rate fluctuates beyond the upper limit, it is determined that the human body is in an abnormal state, such as a rapid rise in blood pressure or a sudden change in physical condition, such as an excitable state. If the heart rate fluctuates beyond the upper limit, it is determined that there is an abnormal state due to a rapid decrease in heart function.
Further, it is determined that an extremely serious abnormal state such as a cardiac arrest occurs when the heart rate is not detected.

The abnormality determination circuit 10 is a distance measuring sensor.
Human body detection sensors such as S3, heat ray sensor S6, ultrasonic sensor S4
Abnormality detection is started by the human body detection signal output from S5. Then, after determining that the human body is abnormal with respect to the predetermined state, the determination circuit 9 outputs a warning signal to the outside of the toilet by voice or screen display to prompt rescue.

The human body abnormality detecting sensor S2 is configured such that the heart rate data detected by the detecting unit 8 comprising the heart rate sensor S is:
Since it is surely changed when the human body is abnormal, the abnormality determination unit determines whether the human body is abnormal with respect to a predetermined state based on the heartbeat data,
An abnormality in the human body can be detected with high reliability.

Next, a heart rate sensor according to a fifth embodiment of the present invention will be described.
S will be described below with reference to FIG. It is to be noted that the same members as those of the fourth embodiment are denoted by the same reference numerals, and only the parts different from those of the fourth embodiment will be described. In the fourth embodiment, the optical fibers 13 are spread all over the surface of the sheet 15, whereas in the present embodiment, an elastic member 16 having an elastic surface that expands and contracts with vibration on the outer surface is provided. Telescopic member
It is configured to be disposed along the 16 elastic surfaces 16a.

More specifically, the elastic member 16 is a disk-shaped bag body in which liquid or gas is sealed, and a cable 14 similar to that of the fourth embodiment is wound around an elastic surface 16a formed of the side surface. . When the elastic member 16 is crushed by the load of the human body and expands in the radial direction, and tension is applied to the cable 14, the deformable member 12 housed in the groove 14 a of the cable 14 presses the optical fiber 13. The optical fiber 13 undergoes micro-bending, and the optical fiber 13
Changes the propagation state of the optical signal.

In the heart rate sensor S, in addition to the effect of the fourth embodiment, the deformable member 12 disposed along the elastic surface 16a of the expandable member 16 has the elastic member 16 which expands and contracts with vibration. Because the displacement occurs according to the magnitude of the vibration itself, regardless of the distance between the points where the stretching force is transmitted,
The heart rate can be counted more accurately than in the embodiment.

In the first and second embodiments, the light emitting element 1a, the light receiving element 1d, and the optical waveguide 1c are disposed on the printed board with a predetermined relative positional relationship. However, the present invention is not limited to the arrangement provided in each of them, and they may be arranged individually.

The human body detection sensor S1 incorporates the heart rate sensor S of the second embodiment.
The same effect can be obtained by incorporating any one of the heart rate sensors S 1 of the third, fourth, and fifth embodiments.

The human body abnormality detecting sensor S2 incorporates the heart rate sensor S of the fourth embodiment. However, the heart rate sensor S2 of the first, second, third or fifth embodiment is incorporated. The same effect can be obtained by incorporating any of the above.

[0056]

The heart rate sensor according to the first aspect of the present invention detects heart rate data on a heartbeat based on the transmission state of an optical signal whose transmission state changes in response to vibration based on the heartbeat. The heart rate can be counted even if the measurer is conscious of trying to count the heart rate and does not attach it to the finger or wrist of the human body by attaching it to the part where the vibration based on the heartbeat is transmitted as appropriate can do.

In the heartbeat sensor according to the second aspect of the present invention, when the relative position of the disturbance member having a refractive index of 1 or more with respect to the optical waveguide changes according to the vibration, the propagation state of the optical signal in the optical waveguide changes. As a result, the transmission state of the optical signal changes, so that the effects described in claim 1 can be obtained.

According to a third aspect of the present invention, the light-emitting element, the light-receiving element, and the optical waveguide are provided with a member having a predetermined relative positional relationship. It is not necessary to separately install the optical waveguides, which facilitates the installation work.

In the heart rate sensor according to the fourth aspect of the present invention, the disturbance member is limited to only the operation in one direction from the reference point by the restricting means. Even when the above operation is performed, the reference point is always reset, so that the accuracy of the distance from the optical waveguide can be increased.

According to the heartbeat sensor of the present invention, when the relative positional relationship between the first optical waveguide and the second optical waveguide changes in response to the vibration, the first optical waveguide and the second optical waveguide are changed. Since the state of optical coupling with the optical waveguide changes, the propagation state of the optical signal in both waveguides fluctuates, and the transmission state of the optical signal changes, so that the effects described in claim 1 can be achieved. .

According to the heart rate sensor of the invention, when the deformable member deforms the optical fiber in response to the vibration, the propagation state of the optical signal in the optical fiber fluctuates, and the transmission state of the optical signal changes. Therefore, in the heartbeat sensor according to the invention of claim 7, the effect of claim 1 can be obtained, the deformation member disposed along the expansion and contraction surface of the expansion and contraction member is a member of the expansion and contraction member that expands and contracts with vibration. Since the displacement is made according to the magnitude of the vibration itself irrespective of the distance to the portion to which the stretching force is transmitted, the heart rate can be counted more accurately than in the sixth embodiment.

The human body detection sensor according to the invention of claim 8 is:
Since the heartbeat data detected by the detection unit comprising the heartbeat sensor according to any one of claims 1 to 7 is unique to a human body, the determination unit determines whether a human body is present based on the heartbeat data. By making the determination, the presence or absence of a human body can be detected with high reliability.

According to a ninth aspect of the present invention, there is provided a human body abnormality detecting sensor, wherein the heart rate data detected by the detecting section comprising the heart rate sensor according to any one of the first to seventh aspects is reliable when the human body is abnormal. The abnormality determination unit determines whether or not the human body is abnormal with respect to a predetermined state based on the heartbeat data, so that the abnormality of the human body can be detected with high reliability. Can be.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an explanatory diagram showing processing according to the above.

FIG. 4 is an explanatory diagram of an output signal according to the above.

FIG. 5 is a front view showing a second embodiment of the present invention.

FIG. 6 is a front view showing a state where the above is assembled in a seat.

FIG. 7 is a block diagram of a human body detection sensor incorporating the heart rate sensor according to the first embodiment.

FIG. 8 is a block diagram of a human body abnormality detection sensor incorporating the heart rate sensor according to the first embodiment.

FIG. 9 is a schematic view of the inside of an automobile equipped with the human body abnormality detection sensor shown in FIG.

FIG. 10 is a perspective view showing a state where optical coupling is performed between both optical waveguides according to a third embodiment of the present invention.

FIG. 11 is a perspective view of a cable according to a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view showing an arrangement state of beads and optical fibers in a groove portion of the cable according to the first embodiment.

FIG. 13 is a plan view of the seat on which the cable is arranged.

FIG. 14 is a block diagram of a human body abnormality detection sensor incorporating the heart rate sensor according to the first embodiment.

15 is a side view of the inside of a toilet in which the human body abnormality detection sensor of FIG. 14 is provided.

FIG. 16 is a plan view of the inside of the toilet in which the human body abnormality detection sensor of FIG. 14 is provided.

FIG. 17 is a perspective view showing an arrangement state of a cable according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1a Light emitting element 1d Light receiving element 1c Optical waveguide 1m First optical waveguide 1n Second optical waveguide 2 Disturbance member 3 Optical signal transmission means 4 Restriction member (Limiting means) 8 Detecting unit 9 Judgment circuit (Judgment unit) 10 Abnormality judgment circuit (Abnormality judgment part) 12 Deformable member 13 Optical fiber 16 Telescopic member 16a Telescopic surface S Heart rate sensor S1 Human body detection sensor S2 Human body abnormality detection sensor

Claims (9)

[Claims] 1. An optical signal transmitting means for changing a transmission state of an optical signal according to a vibration based on a heartbeat, wherein heartbeat data on the heartbeat is detected based on the transmission state of the optical signal. Heart rate sensor. 2. The optical signal transmitting means according to claim 1, wherein said optical waveguide transmits an optical signal emitted by said light emitting element and causes said light receiving element to receive the optical signal, and said optical waveguide has a refractive index of 1 or more and is responsive to said vibration. The heart rate sensor according to claim 1, further comprising a disturbance member whose positional relationship changes. 3. The heart rate sensor according to claim 2, wherein the light emitting element, the light receiving element, and the optical waveguide are disposed on the same member with a predetermined relative positional relationship. 4. A limiting means is provided for limiting the reciprocating operation of the disturbance member in both directions with respect to a reference point due to the vibration to only an operation in one direction from the reference point. The heart rate sensor according to claim 2 or claim 3. 5. The optical signal transmitting means comprises: a first optical waveguide for transmitting an optical signal; and an optical signal coupled to the first optical waveguide, the optical signal transmitting means transmitting the optical signal, and transmitting the optical signal in response to the vibration. The heartbeat sensor according to claim 1, further comprising: a second optical waveguide whose relative positional relationship changes. 6. The optical signal transmitting means includes: an optical fiber that propagates an optical signal; and a deformable member that deforms the fiber by being displaced based on the vibration so as to change a propagation state of the optical signal. The heart rate sensor according to claim 1, wherein: 7. An elastic member having an elastic surface on an outer surface which expands and contracts with said vibration is provided, and said deformable member is arranged along the elastic surface of said elastic member. Heart rate sensor as described. 8. A detection section comprising the heart rate sensor according to claim 1, and a presence / absence of a human body is determined based on heart rate data relating to a heart rate detected by the detection section, and a detection signal is output. A human body detection sensor comprising: a determination unit. 9. An abnormality detecting section comprising the heart rate sensor according to claim 1 and a human body which is abnormal with respect to a predetermined state based on heart rate data relating to a heart rate detected by the abnormality detecting section. A human body abnormality detection sensor, comprising: an abnormality determination unit that determines whether or not there is an alarm and outputs a warning signal.