JP2007159893A - Biological signal detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological signal detector having good installation property and housing property relating to the biological signal detector which is arranged on a bedding such as a bed in order to detect signals such as heart rate and body movement. <P>SOLUTION: Single or a plurality of flexible piezoelectric cable sensors 1 for detecting pressure fluctuation generated from a living body are arranged at a cloth 8 so as to cross at least at one point. Thus, when vibration from the living body 11 is applied to the biological signal detector 9, bending action is mutually applied along the cross sectional shapes of the piezoelectric sensors 1 at the intersections of the piezoelectric sensors 1, so that sensitivity of the vibration from the living body 11 is increased. Since the piezoelectric sensors 1 and the cloth 8 in which the piezoelectric sensors 1 is arranged, are flexible, the biological signal detector can be bent and can be bent and housed when the detector is arranged or moved, thereby enhancing its handleability. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a biological signal detection apparatus that is installed in bedding such as a bed and detects signals such as heartbeats and body movements.

  Conventionally, this type of biological signal detection device is installed on a product that is subjected to a biological load, such as bedding or a chair, and has a structure in which a biological signal detection means and an uneven member are combined in order to improve detection sensitivity. . (For example, see Patent Document 1 and Patent Document 2).

  FIG. 20 is a configuration diagram of a conventional biological signal detection device described in Patent Document 1. FIG. 21 is a cross-sectional view of a main part of the biological signal detection device described in the same document. In FIG. 20, the pressure-sensitive means 1 is installed on the hard member 2, and the hard member 2 is installed on the hard member 3 having holes 3a to 3d (corresponding to a plurality of rods of the present invention). Installed between the floor board 4 and the mattress 5. A large signal is obtained because a large bending deformation is applied to the pressure-sensitive means 1 at the edge of the hole (for example, point 31) in FIG. 21 due to vibration from the living body sleeping on the bed.

FIG. 22 is a configuration diagram of a detection unit of another conventional biological signal detection device described in Patent Document 2. In FIG. 22, a conventional biological signal detection apparatus sandwiches an optical fiber 6 (corresponding to pressure-sensitive means of the present invention) for detecting signals between concavo-convex members 7a and 7b (corresponding to a plurality of bars of the present invention), When this vibration is applied, the optical fiber 6 is largely bent to obtain a large signal.
JP 2005-13259 A JP-A-8-584

  However, in the conventional configuration, the hard member 2 has the same size as the bedding and is bulky, so it takes time to install and move, and the hard member 2 and the concavo-convex members 7a and 7b are hard, so they are stored small. There was a problem that it was difficult to do.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a biological signal detection device having good installation property and storage property.

  In order to solve the above-described conventional problems, the biological signal detection device of the present invention includes a flexible single or plural cable-shaped pressure-sensitive means for detecting pressure fluctuations generated from a living body, and the pressure-sensitive device. The means is arranged on a flexible member so that the means intersect at least at one point.

  As a result, when vibration from the living body is applied to the biological signal detection device, a bending action is applied along the cross-sectional shape of each pressure-sensitive means at the intersection of the pressure-sensitive means, thereby increasing the sensitivity of vibration detection from the living body. . In addition, since the pressure-sensitive means and the flexible member on which the pressure-sensitive means are disposed have flexibility, it can be bent at the time of installation or movement, and can be bent and stored.

  The biological signal detection apparatus of the present invention can provide a thing with high detection sensitivity of vibration from a living body and high convenience in handling such as installation and storage.

A first invention includes a flexible single or plural cable-like pressure sensing means for detecting pressure fluctuations generated from a living body, and a flexible member such that the pressure sensing means intersects at least at one point. When the vibration from the living body is applied to the biological signal detection device, a bending action is applied along the cross-sectional shape of each pressure-sensitive means at the intersection of the pressure-sensitive means. Increased vibration sensitivity. In addition, since the pressure-sensitive means and the flexible member on which the pressure-sensitive means are disposed are flexible, the biological signal detection device is highly convenient during handling, such as being bent during installation or moving, and can be bent and stored. Can be provided.

  The second invention has an elastic member, particularly in the first invention, and is arranged so as to overlap the pressure-sensitive means, so that the pressure-sensitive means is indented into the elastic member that causes depression deformation by pressing, A biological signal detection device with high detection sensitivity can be provided by generating a large signal output by applying a bending action more greatly along the cross-sectional shape of the pressure-sensitive means that overlaps the pressure-sensitive means.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, at least a single or a plurality of cable-like pressure sensing means and a flexible member provided with the pressure sensing means are provided. Bending at one place and configuring the pressure-sensitive means to intersect in a state where the members are overlapped, it is possible to easily cross the pressure-sensitive means and detect a biological signal with high sensitivity, and high If signal detection is necessary for a wide area without requiring sensitivity, the signal can be detected by installing without bending. In this way, it is possible to provide an easy-to-use biosignal detection device that can be used by folding the biosignal detection device, expanding it, or using it depending on the purpose.

  In the fourth aspect of the invention, in particular, in the third aspect of the invention, the cable-like pressure-sensitive means is arranged linearly along the bent end portion of the bent portion of the flexible member, so that the deformation does not become excessive due to the bending. Therefore, a highly reliable biological signal detection device can be provided. Further, with this configuration, even when a single cable-like pressure-sensitive means is disposed on the member at the bent portion and other portions, the bent portion deformation due to partial bending deformation can be buffered.

  According to a fifth aspect of the invention, in particular, in the invention according to any one of the third and fourth aspects, the insensitive cable is disposed in the bent portion of the flexible member so that the biological signal detection device is bent and used. In this case, the dead cable is deformed. And since the deformation | transformation with respect to this bending is not output as a pressure-sensitive means, a bending part can be disregarded with respect to detection performance, and a more reliable biological signal detection apparatus can be provided. Even if it is a single cable-like pressure-sensitive means, it is sufficient if it is a partially insensitive part, and a noise factor due to deformation of the eyelash part can be eliminated.

  In the sixth aspect of the invention, in particular, in the invention according to any one of the first to fifth aspects, since the distribution of the intersecting points of the pressure-sensitive means is different for each region, a large number of intersecting points are obtained. To provide a biological signal detection device capable of efficiently detecting a necessary signal by arranging a highly sensitive area in a portion where the sensitivity is high in a certain portion and the sensitivity is low in other portions, and the portion where the load is applied more. Can do.

  According to a seventh aspect of the invention, in particular, in the invention according to any one of the first to sixth aspects, at least a cable-like pressure-sensitive means is enclosed in a dustproof / waterproof means comprising a single or a plurality of film-like members. Thus, it is possible to provide a biological signal detection device capable of performing highly reliable detection without affecting the detection of the biological signal even if a beverage or food is spilled.

In the eighth invention, in particular, in the seventh invention, the single or plural film-like members as the waterproof and dustproof means have conductivity so that electronic devices can be used nearby for collecting and processing biological signals. In addition, it is possible to provide a highly reliable biological signal detection device in which noise is not superimposed even when a communication device such as a mobile phone is used nearby.

  According to a ninth aspect of the invention, in the invention described in any one of the first to eighth aspects, the pressure-sensitive means includes an inner electrode, a pressure-sensitive member provided around the inner electrode, and the pressure-sensitive member. With the outer electrode provided around and being configured in the shape of a coaxial cable, the external electrode serves as a shield with respect to the central electrode that transmits the detected biological signal, and is not easily affected by external electromagnetic noise. Therefore, a highly reliable biological signal detection apparatus with little noise superimposed even when an electronic device is used nearby for the collection and processing of biological signals or a communication device such as a mobile phone is used nearby Can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of the surface of the biological signal detection device. 2 is a configuration diagram of the bed in which the biological signal detection device according to the first embodiment of the present invention is installed, FIG. 3 is a cross-sectional view of the pressure sensing means 1, and FIG. 4 is a block diagram of the biological signal detection device. It is.

  In FIG. 1, a single cable-like piezoelectric sensor 1 having flexibility as a pressure-sensitive means is sewed on the surface of a flexible film-like member such as a cloth 8 so that it intersects at one point substantially at the center. A biological signal detection device 9 is attached. The piezoelectric sensor 1 in this example intersects at an angle of about 90 degrees. A control unit 10 that processes an output signal from the piezoelectric sensor 1 is connected to one end of the piezoelectric sensor 1.

  In FIG. 2, a biological signal detection device 9 is installed on the floor plate 4 of the bed with the surface on which the piezoelectric sensor 1 is sewed as an upper surface, a mattress 5 is disposed thereon, and a living body 11 that is a living body is further disposed thereon. I am sleeping. At this time, vibrations such as heartbeat, respiration, and body movement from the living body 11 are transmitted through the mattress 5 and reach the living body signal detection device 9. At that time, the piezoelectric sensor 1 crosses the piezoelectric sensor 1 at the intersection. A large signal output is generated by adding a bending action along the shape. In the experiment, good results could be obtained by using a piezoelectric sensor having a circular cross-sectional shape with a diameter of about 2.5 mm. Therefore, with the configuration of the present invention, the detection sensitivity of vibration from a living body can be made high. In addition, it is preferable to arrange the piezoelectric sensor 1 so that the crossing position of the piezoelectric sensor 1 is in the vicinity of the part where the body pressure is applied when the living body 11 goes to bed, for example, the head, shoulders, buttocks.

  Further, since the piezoelectric sensor 1 has flexibility and the cloth 8 on which the piezoelectric sensor 1 is disposed is also a flexible material, the biological signal detection device 9 bends or rolls in any direction. Therefore, it is highly convenient to carry, install and store.

  In addition, since the mattress 4 is interposed between the biological signal detection device 9 and the living body 11 because it is installed between the bed floor plate 5 and the mattress 4, the piezoelectric sensor 1 is not in direct contact with the living body 11 and disturbs bedtime. It can be a thing that does not.

  If there is no sense of incongruity depending on the person who goes to bed, the biological signal detection device 9 may be arranged on the mattress 4.

In this example, the biological signal detection device 9 is installed on a bedclothing device such as a bed. However, the present invention is not limited to this, and it may be installed on a chair or a cushion. That is, if it is a household article which receives a biological load continuously, it will become possible to detect a biological signal like this Embodiment. In that case, the biological signal detection device 9 of the present embodiment is installed, for example, between the seat surface of the chair and the cushion, between the tatami mat and the cushion.

  The flexible member on which the piezoelectric sensor 1 is disposed is not limited to the cloth 8 and may be a resin sheet or the like. Moreover, the arrangement | positioning method of the cloth 8 and the piezoelectric sensor 1 is not restricted to sewing, Bonding etc. may be sufficient.

  Hereinafter, the piezoelectric sensor 1 used in the biological signal detection apparatus 9 of the present invention will be described. In FIG. 3, the piezoelectric sensor 1 includes a central electrode 101 made of a conductor as an inner electrode, a piezoelectric layer 102 that is a pressure-sensitive member, an outer electrode 103 made of a conductor, and a coating layer 104 made of an elastic body. The piezoelectric layer 102 may be a resin-based polymer piezoelectric material such as polyvinylidene fluoride, or a composite piezoelectric material in which piezoelectric ceramic powder is mixed in a specific resin member. The outer electrode 103 is disposed so as to surround the inner electrode 101 and the piezoelectric layer 102. Since the piezoelectric sensor 1 has a coaxial cable shape, the outer electrode 103 serves as a shield with respect to the center electrode 101 that transmits a signal. It will be less susceptible to the effects of external electromagnetic noise. Therefore, even when an electronic device is used nearby to collect and process biological signals, or a communication device such as a mobile phone is used nearby, the piezoelectric sensor 1 is less likely to be superimposed on noise. A high biological signal detection device 9 can be provided.

  Although the coaxial cable-like piezoelectric sensor 1 is shown as an example of the cable-like pressure-sensitive means having the inner electrode and the outer electrode, the present invention is not limited to this, and a cable having a plurality of center conductors, a center conductor The same effect can be obtained by using a cable that is eccentric from the center of the outer electrode, a cable whose cross-sectional shape is not circular, or the like.

  Next, a processing example of the output signal of the piezoelectric sensor 1 and a detection operation of the biological signal from the living body 11 will be described. FIG. 4 is a block diagram of the biological signal detection apparatus 9 according to the first embodiment of the present invention. In FIG. 4, the control unit 10 includes detection means 12, determination means 13, and notification means 14. The detection means 12 filters the output signal from the piezoelectric sensor 1 with a predetermined filtering characteristic, and amplifies the output signal of the filter section 15 with a predetermined set value. And a comparator unit 16 for comparison. As the filtering characteristics of the filter unit 15, for example, commercial power supply frequencies that are likely to be superimposed on the signal as noise are 50 Hz and 60 Hz, but the signal of the living body 11, for example, heartbeat is around 1 Hz, breathing is around 0.1 Hz, body motion Is a range of several Hz, and therefore, as a filtering characteristic, for example, a band-pass filter that passes a signal component of 0.05 Hz to 20 Hz is used.

  The operation and action of the biosignal detection device 9 configured as described above will be described with reference to FIG. FIG. 5 is a characteristic diagram showing temporal changes in the output signal V of the filter unit 15 and the output signal J of the comparator unit 16 corresponding to the output of the piezoelectric sensor 1 when vibration derived from the heartbeat of the living body 11 is applied to the piezoelectric sensor 1. It is.

First, when the living body 11 lies on the bed, pressure such as weight from the living body 11 and vibration such as heartbeat are applied to the piezoelectric sensor 1 via the mattress 4. At this time, the piezoelectric sensor 1 is deformed, and a signal corresponding to the deformation acceleration of the piezoelectric sensor 1 is output by the piezoelectric effect. Therefore, pressure or the like due to unweighted body weight is not detected, and only the vibration component with variation is detected. For example, body movement, respiration, heartbeat signal, and the like are detected. At this time, the bending deformation of the piezoelectric sensor 1 is increased particularly at the intersection of the piezoelectric sensor 1, and a larger output signal is obtained. And the output signal of the piezoelectric sensor 1 passes the signal of 0.05-20 Hz which is a frequency band at the time of the contact of the vibration from living bodies, such as a heartbeat, by the filter part 15, and the signal of other frequency bands is removed. . FIG. 5 shows the output signal V of the filter unit 16. When heartbeat vibration is detected, a signal component larger than the reference potential V ₀ appears in V. Then, the acceleration that is the second derivative value of the deformation amount also increases, and as a result, the output signal of the piezoelectric sensor 1 also increases. Comparator unit 16 amplitude from _{V 0} which _V | V-V ₀ | is determined by detecting the heartbeat vibration if larger than _{D 0,} and outputs the BALS signal of Lo → Hi → Lo as judging output at time t1 .

  As described above, the signal output from the comparator unit 16 is input to the determination unit 13, and for example, the heart rate period, that is, the heart rate is known from the cycle Δt of the heart rate signal, and the notification unit 14 displays the heart rate or reports it by voice. it can.

(Embodiment 2)
A biological signal detection apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 6 (a), 6 (b), and 7. FIG. FIG. 6A is a configuration diagram of the biological signal detection apparatus of the present embodiment.
The difference from the first embodiment is that a single cable-like piezoelectric sensor 1 sewed on the cloth 8 is bent substantially at the center so that the cloth 8 as a member is overlapped and disposed on the overlapping cloth. The piezoelectric sensor 1 is configured to intersect. What is necessary is just to provide the pattern arrange | positioned in each part of the cloth 8 which is an overlapping member so that it may cross | intersect in the state which overlapped. In addition, the piezoelectric sensor is linearly arranged along a bent valley portion or mountain of the bent portion of the cloth 8.

  The configuration will be described below. As shown in FIG. 6A, the piezoelectric sensor 1 is sewn in an S shape on the cloth 8, and the signal is detected by bending the cloth 8 at a substantially central portion AA. At this time, a part of the piezoelectric sensor 1 is linearly arranged along AA which is a bent portion. The other portions are sewn to the upper and lower portions of AA at an angle of about 45 degrees with respect to AA, resulting in an S-shape. When the cloth 8 sewn with the piezoelectric sensor 1 is folded at AA and overlapped as described above, the piezoelectric sensor 1 intersects at about 90 degrees at one point as shown in FIG. 6B. Note that the folding direction is not limited to this, and the back and front may be folded reversely with respect to FIG. 6B as shown in FIG.

  Since the piezoelectric sensor 1 in the bent portion A-A is linear, the bending deformation of the piezoelectric sensor 1 does not become excessive, so that a highly reliable biological signal detection device can be obtained. That is, the deformation of the piezoelectric sensor 1 with respect to the bending of the cloth 8 shares the torsional deformation of about 180 degrees in the entire linear portion of the piezoelectric sensor 1 arranged at AA. On the other hand, for example, if the piezoelectric sensor 1 is disposed so as to intersect the bent portion AA, a bending deformation with a small curvature occurs at one point of the bent portion, so that the load on the piezoelectric sensor 1 is locally increased, resulting in reliability. May decrease. However, a highly reliable biological signal detection device can be provided by adopting the configuration of the present invention.

  In addition, when a signal with high sensitivity is not required and signal detection in a wide area is necessary, the biological signal detection device 9 of the present invention may be unfolded and installed on a bed or the like for signal detection. In this case, for example, even if signals such as respiration and heartbeat cannot be accurately detected, it can be used for the purpose of detecting the presence or absence of a person sleeping on the bed. As described above, the biological signal detection device 9 can be used by being bent, spread, or used depending on the purpose.

  In this example, the angle of the piezoelectric sensor 1 other than the bent portion AA is 45 degrees with respect to AA. However, the angle is not limited to this, and other angles may be used. . In that case, when the cloth 8 is bent, the angle at which the piezoelectric sensor 1 intersects is not 90 degrees, but even if it is not 90 degrees, a bending action at the point where the piezoelectric sensor 1 intersects can be expected.

In the present embodiment, this configuration is preferable when the intersection is approximately the center of the member and the signal detection area is the center. When the other detection areas are mainly used, the intersection is within the corresponding area. If it is configured to enter, signal detection can be performed efficiently.

(Embodiment 3)
A biological signal detection apparatus according to a third embodiment of the present invention will be described with reference to FIGS. 8 (a), 8 (b), and 9. FIG. FIGS. 8A and 8B are configuration diagrams of the biological signal detection device according to the present embodiment, and FIG. 9 is a cross-sectional view of the biological signal detection device taken along line CC in FIG. 8B.

  The difference from the first and second embodiments is that the sponge 17 is placed on the cloth 8 on which the piezoelectric sensor 1 is placed.

  The vibration from the living body 11 is transmitted to the piezoelectric sensor 1 through the mattress 5 to explain the operation and action at this time. At that time, as shown in FIG. The piezoelectric sensor 1 is bent, and a bending action is applied along the cross-sectional shape of the overlapping piezoelectric sensors 1 to generate a large signal output. The hardness of the sponge 18 is preferably such that it has a hardness that does not collapse although it deforms depending on the body weight of the living body 12 and the weight of the mattress 5. For example, a material having a hardness of about the mattress 5 can be used. By setting it as such a structure, a biosignal can be detected more sensitively.

  In the present embodiment, the piezoelectric sensor 1 is disposed meandering on the cloth 8. As shown in FIG. 8A, the lower half of the bent portion B-B is arranged to meander the piezoelectric sensor 1 in the horizontal direction, and the upper half is meandered in the vertical direction. By arranging in this way, the piezoelectric sensor 1 intersects at a plurality of points as shown in FIG. This makes it possible to detect a biosignal with a higher sensitivity in a wider area than when intersecting at one point.

  Even if an airbag is used as the elastic member such as the sponge 18, the same effect can be obtained.

  Of course, the biological signal detection apparatus may be configured without an elastic member as a sensor arrangement as in the present embodiment.

(Embodiment 4)
A biological signal detection apparatus according to the fourth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a configuration diagram of the biological signal detection device of the present embodiment, FIG. 11 is a diagram when the biological signal detection device is folded, and FIG. 12 is a cross-sectional view of the biological signal detection device taken along line FF in FIG.

  The difference from the first to third embodiments is that the cloth 8 provided with the piezoelectric sensor 1 is bent twice. As shown in FIG. 10, the cloth 8 is bent at approximately two equal locations at DD and EE, and the biological signal is detected in a bent form as shown in FIG. The piezoelectric sensor 1 is arranged to meander in the horizontal direction in the portion above the bent portion DD, and is arranged to meander in the vertical direction in the portion sandwiched between the bent portions DD and EE, The portion below the bent portion EE is meandering in the lateral direction. Moreover, although the part above DD and the part below EE are both meandering in the horizontal direction, the positional relationship is such that the piezoelectric sensors 1 do not overlap each other when the cloth 8 is bent. It is desirable to arrange the piezoelectric sensor 1 in such a manner. That is, as shown in FIG. 12, the uppermost piezoelectric sensor 1 (piezoelectric sensor 1 provided with a portion above DD) is arranged at the lowermost piezoelectric sensor 1 (the portion below EE). The piezoelectric sensor 1) is arranged so as to be staggered.

By arranging in this way, the piezoelectric sensor 1 sandwiched between the uppermost piezoelectric sensor 1 and the lowermost piezoelectric sensor 1 is mutually aligned along the sectional shape of the piezoelectric sensor 1 due to a load or vibration from a living body. A large signal output is generated due to the bending action. Further, even when the vibration detection device 9 is used on the back side, the bending action is applied to each other along the cross-sectional shape of the piezoelectric sensor 1 and a large signal output is generated, so that it can be installed without taking the front and back sides into consideration. The biological signal detection device 9 with good quality can be obtained.

  Moreover, as shown in FIG. 13, it is sealed in a bag 19 made of a resin film having no water permeability so as to cover the bent biological signal detection device 9 so as to prevent dust and water from entering, thereby providing dustproof and waterproof means. . Therefore, even if a drink or food is spilled on the bed and it is applied to the biological signal detection device 9, it can be detected with high reliability without affecting the detection of the biological signal. Note that the biological signal detection device 9 may be bent after being enclosed in the resin bag 19 in a state before being bent. In this case, since the deformation amount of the piezoelectric sensor 1 is slightly restricted by the resin bag 19, it is preferable to enclose it in the bag 19 in a folded state, but it is folded by selecting a film having an appropriate thickness and flexibility. Even if sealed in the previous state, the desired sensitivity can be sold. In addition, the biological signal detection device 9 may be sealed with a plurality of resin films from above and below by heat welding or the like. In addition, the piezoelectric sensor 1 is bonded to a resin film having no water permeability instead of the cloth 8 on which the piezoelectric sensor 1 is disposed, and the piezoelectric sensor is formed by a resin film having no water permeability so as to sandwich the piezoelectric sensor 1 from above. 1 may be adhered and arranged so as to cover 1 to provide a waterproof and dustproof means.

In addition, the resin film forming the bag 19 has conductivity, serves as a shield, and is hardly affected by external electromagnetic noise. Therefore, a highly reliable biological signal detection apparatus with little noise superimposed even when electronic devices are used nearby for the collection and processing of biological signals or when communication devices such as mobile phones are used nearby (Embodiment 5)
A biological signal detection apparatus according to a fifth embodiment of the present invention will be described with reference to FIGS. 14 (a) and 14 (b). FIG. 14A is a configuration diagram of the biological signal detection device of the present embodiment, and FIG. 14B is a diagram when the biological signal detection device is bent.

  The difference from the first to fourth embodiments is that two piezoelectric sensors 1a and 1b are respectively disposed at the upper and lower portions of the bent portion GG of the cloth 8, and they are, for example, a coaxial cable 20 for television. A dead cable having no piezoelectric action as described above is used to connect by a connector 21 and a biological signal is detected using a single control unit 10.

  With this configuration, the coaxial cable 20 is linearly disposed along the bent portion GG at the bent portion GG, and when the biological signal detecting device 9 is bent and used, the coaxial cable 20 is twisted by about 180 degrees. Will be applied to the entire straight portion. And since the cable deformation | transformation with respect to this bending is not applied to the piezoelectric sensor 1, a bending part can be disregarded with respect to detection performance, and the biological signal detection apparatus 9 with higher reliability can be provided.

  In this embodiment, the coaxial cable 20 is used as the dead cable. However, the present invention is not limited to this, and the unpolarized piezoelectric sensor 1 may be used. Since the piezoelectric sensor 1 before polarization does not generate a signal even if it is deformed, a bent portion can be ignored for detection performance.

As shown in FIGS. 15A and 15B, the piezoelectric sensor 1a is disposed on the surface of the cloth 8, the piezoelectric sensor 1b is disposed on the back surface, and the piezoelectric sensor 1a on the front surface and the piezoelectric sensor on the back surface are disposed. The sensor 1b may be connected by the coaxial cable 20. At this time, the coaxial cable 20 is subjected to bending deformation instead of torsion, but this curvature is designed to be within an allowable range of strength of the piezoelectric cable 20. At this time, the cable deformation against bending is applied to the piezoelectric sensor 1. Therefore, the bent portion can be ignored with respect to the detection performance, and the biological signal detection device 9 with higher reliability can be provided.

  In addition, since the coaxial cable 20 is connected to the piezoelectric sensor 1 by the connector 21, the coaxial cable 20 may be replaced with a new coaxial cable 20 when the coaxial cable 20 deteriorates due to a bending action.

  In this embodiment, an example of using a coaxial cable for television, for example, 3C-2V, is shown as the coaxial cable 20 used as a dead cable. However, the present invention is not limited to this. For example, if 1.5C-2V or the like having the same outer diameter as that of the piezoelectric sensor 1 is used, the biological signal detection device 9 may be more compact. The connector 21 for connecting the coaxial cable 20 and the piezoelectric sensor 1 can be an F connector or BNC connector, which is a general coaxial connector. However, if a more compact SMA connector, SMB connector or the like is used. The biological signal detection device 9 may be more compact.

(Embodiment 6)
A biological signal detection apparatus according to the sixth embodiment of the present invention will be described with reference to FIGS. FIG. 16 is a configuration diagram of the biological signal detection device of the present embodiment, and FIG. 17 is a configuration diagram when the biological signal detection device is bent. FIG. 18 is a configuration diagram of a bed (sleeping apparatus) in which a biological signal detection device is installed. The difference from the first to fifth embodiments is that the cloth 8 provided with the piezoelectric sensor 1 is folded twice, and the difference from the fourth embodiment where the cloth 8 is folded twice is different. The folding position is such that only a part of the piezoelectric sensor 1 overlaps.

  The configuration will be described below. The cloth 8 provided with the piezoelectric sensor 1 is bent at two locations H-H and II as shown in FIG. 16, and a biological signal is detected in the form as shown in FIG. The region sandwiched between the bent portions HH and the bent portions II is narrower than the upper and lower regions. As a result, when the biological signal detection device 9 is bent, only the region J which is a part of the biological signal detection device 9 becomes a portion where the piezoelectric sensor 1 overlaps as shown in FIG. Therefore, the portion where the sensitivity is increased by the intersection of the piezoelectric sensors 1 is only the region J, and the biological signal detection device 9 is partially different in sensitivity.

  This biological signal detection device 9 is incorporated in the bed as shown in FIG. 18, for example, by placing the biological signal detection device 9 so that the region J of the biological signal detection device 9 is located under the shoulder rib, which is loaded when the living body 11 lies on the bed. There is a usage method in which heartbeat vibration is efficiently detected and the presence / absence of the living body 11 on the bed is determined in a portion other than the region J, and a biological signal can be detected more efficiently.

  Note that the position of the region J is not limited to the position of the present embodiment, that is, the vicinity of the center of the biological signal detection device, and the signal from the vicinity of the head of the living body 11 is detected with higher sensitivity using the upper portion of the biological signal detection device as the region J Alternatively, the signal from the vicinity of the buttocks of the living body 11 may be detected with higher sensitivity using the lower part of the living body signal detection device as the region J.

(Embodiment 7)
A biological signal detection apparatus according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 19 is a configuration diagram of the biological signal detection apparatus of the present embodiment. The difference from the first to sixth embodiments is how the piezoelectric sensor 1 disposed on the cloth 8 is disposed. As shown in FIG. 19, in the region L, the piezoelectric sensors 1 are arranged in a meandering manner more than other portions so as to increase the density of the piezoelectric sensors 1 in particular. Then, since the cloth 8 is bent by KK, a larger number of intersections are generated in the region L than in other portions, and as a result, the sensitivity of the region L can be made higher than that in the other portions.

  In the first to sixth embodiments, the piezoelectric sensor 8 is used as the pressure sensing means. However, as the pressure sensing means, an optical fiber having a characteristic that the transmitted light is modulated in response to pressure deformation is sensed as a cable. Even if it is used as the pressure means, the same effect is obtained.

  As described above, the biological signal detection device according to the present invention can be easily bent to arrange the flexible signal so that single or plural piezoelectric sensors intersect to increase sensitivity. It can be installed in a bed as described above and used to acquire biosignals, and can be used for relaxation devices such as massage chairs, car seats, and entertainment facilities. It can also be applied as a system for detecting a biological signal by installing it on a seating surface such as a seat. Further, the present invention is applicable not only to living organisms such as being placed under a pet mat, but also to uses for detecting animal biological signals.

The block diagram of the biosignal detection apparatus in the 1st Embodiment of this invention The block diagram in which the biological signal detection apparatus in the 1st Embodiment of this invention was installed Sectional drawing of the pressure-sensitive means in the 1st Embodiment of this invention The block diagram of the biological signal detection apparatus in the 1st Embodiment of this invention The characteristic view which shows the time-dependent change of the output signal V of the filter part and the output signal J of the comparator part when receiving a human vibration in the biological signal detection apparatus according to the first embodiment of the present invention. (A) Configuration diagram of the biological signal detection device in the second embodiment of the present invention (b) Configuration diagram when the biological signal detection device in the embodiment is bent The block diagram when the biological signal detection apparatus in the 2nd Embodiment of this invention is folded. (A) Configuration diagram of the biological signal detection device according to the third embodiment of the present invention (b) Configuration diagram when the biological signal detection device according to the embodiment is bent CC sectional drawing of the biosignal detection apparatus in the 3rd Embodiment of this invention. The block diagram of the biological signal detection apparatus in the 4th Embodiment of this invention The block diagram when the biological signal detection apparatus in the 4th Embodiment of this invention is bent. FF sectional drawing of the biosignal detection apparatus in the 4th Embodiment of this invention. FF sectional drawing of the biosignal detection apparatus in another example of the 4th Embodiment of this invention. (A) Configuration diagram of the biological signal detection device in the fifth embodiment of the present invention (b) Configuration diagram when the biological signal detection device in the same embodiment is bent (A) Configuration diagram of the front surface of the biological signal detection device in another example of the fifth embodiment of the present invention (b) Configuration diagram of the back surface of the biological signal detection device in the same embodiment The block diagram of the biological signal detection apparatus in the 6th Embodiment of this invention The block diagram when the biological signal detection apparatus in the 6th Embodiment of this invention is bent. The block diagram in which the biological signal detection apparatus in the 6th Embodiment of this invention was installed The block diagram of the biosignal detection apparatus in the 7th Embodiment of this invention 1 is a configuration diagram of a conventional biosignal detection device according to a first example. Sectional drawing of the principal part at the time of arrange | positioning the biological signal detection apparatus of the conventional 1st example to a bed Configuration diagram of conventional biological signal detection device of second example

Explanation of symbols

1 Piezoelectric sensor (pressure sensitive means)
8 Cloth (Flexible material)
9 Biosignal detector Piezoelectric 18 Sponge (elastic member)
19 Resin film bag (dustproof and waterproof)
20 Coaxial cable (dead cable)
101 Center electrode (inner electrode)
102 Piezoelectric layer (pressure-sensitive member)
103 outer electrode

Claims (9)

A structure having a flexible single or plural cable-like pressure sensing means for detecting pressure fluctuations generated from a living body, and arranged on a flexible member so that the pressure sensing means intersects at least at one point; Biological signal detection device. The biological signal detection device according to claim 1, wherein the biological signal detection device has an elastic member and is arranged so as to overlap the pressure-sensitive means. 3. The pressure sensitive means according to claim 1 or 2, wherein the pressure sensitive means intersects each other by bending a single or plural cable-like pressure sensitive means and a flexible member provided with the pressure sensitive means at least at a single location. The biological signal detection apparatus of any one of Claims. 4. The biosignal detection device according to claim 3, wherein the cable-like pressure sensing means is linearly arranged in the bent portion of the flexible member. The biological signal detection device according to claim 3, wherein a dead cable is disposed in a bent portion of the flexible member. The biological signal detection device according to claim 1, wherein the distribution of the intersecting points of the pressure-sensitive means is different for each region. The biological signal detection device according to any one of claims 1 to 6, wherein at least a cable-like pressure sensing means is enclosed in a dustproof waterproofing means comprising a single or a plurality of film-like members. The biological signal detection device according to claim 7, wherein the single or plural film-like members as the waterproof and dustproof means have conductivity. 9. The pressure sensing means according to claim 1, wherein the pressure sensing means comprises a coaxial cable including an inner electrode, a pressure sensitive member provided around the inner electrode, and an outer electrode provided around the pressure sensitive member. The biological signal detection device according to claim 1.

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