JP2008183181A - Biological signal detector and sleeping device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a detecting capacity becomes insufficient in the case where vibration is applied to a fixing part because the movement of an uneven member in the fixing part is controlled even if the uneven elastic member is bent to transmit vibration when the uneven member is fixed by a screw or the like in the constitution of a conventional biological signal detector. <P>SOLUTION: The biological signal detector 4 has a pressure-sensitive means 8 having a flexibility and detecting the pressure fluctuations caused in a living body and a plurality of press members 6 having a plurality of uneven parts 5 arranged so as to cross the pressure-sensitive means 8. The press members 6 are layered to hold the pressure-sensitive means 8 in between and the pressure-sensitive means 8 is pressed and deformed by the uneven parts 5 of the press means 6 while a plurality of the press means 6 are connected and supported so as to be made movable to each other to detect a biological signal at any part with high sensitivity. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a biological signal detection apparatus that is installed in a sleeping apparatus such as a bed and detects a signal such as a heartbeat.

  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, refer to Patent Document 1).

FIG. 18 is a configuration diagram of a detection unit of another conventional biological signal detection device described in Patent Document 1. In FIG. In FIG. 18, the conventional biological signal detection apparatus 1 includes an optical fiber 2 (corresponding to the pressure-sensitive means of the present invention) for detecting a signal, and uneven members 3 a and 3 b (corresponding to a pressing member having a plurality of unevennesses of the present invention). In other words, when the vibration from the living body is applied, the optical fiber 2 is deformed to obtain a large signal.
JP-A-8-584

  However, in the conventional configuration, the fixing method is not described. For example, when both ends are fixed with screws or the like via spacers corresponding to the thickness of the optical fiber, the uneven members 3a and 3b have elasticity. Even if the vibration is transmitted by bending, the movement at the fixed portion is restricted. Therefore, when the vibration is applied to the fixed portion, the vibration transmitted to the optical fiber 2 is suppressed, and the detection capability of the detection device is reduced. The problem of decreasing can be considered.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a biological signal detection device that realizes high detection sensitivity no matter which part of the detection device is subjected to vibration.

  In order to solve the above-described conventional problems, a biological signal detection device according to the present invention includes a pressure-sensitive means having flexibility for detecting pressure fluctuations generated by a living body, and a plurality of pressure-sensitive means arranged to intersect the pressure-sensitive means. A plurality of pressing members having unevenness, wherein the pressing members are arranged so as to sandwich the pressure-sensitive means, the pressure-sensitive means is pressed and deformed by the unevenness of the pressing members, and the plurality of pressing members are It was set as the structure supported by a connection member so that it might mutually move. For this reason, the pressing member moves in the same manner near the center of the sleeping device where the biological signal detecting device is installed and at the end portion, and the pressure sensitive means is greatly deformed, so that the biological signal is detected with high sensitivity regardless of the sleeping position.

  The biological signal detection device of the present invention can provide an object capable of detecting a vibration signal generated from a living body with high sensitivity.

According to a first aspect of the present invention, the biological signal detection apparatus of the present invention has a pressure-sensitive means having flexibility for detecting pressure fluctuations generated by a living body, and a plurality of projections and depressions arranged so as to intersect the pressure-sensitive means. It has a plurality of pressing members, the pressing members are arranged so as to sandwich the pressure-sensitive means, the pressure-sensitive means are pressed and deformed by the unevenness of the pressing members, and the plurality of pressing members move relative to each other. Since the connecting member is connected and supported by the connecting member, the pressing member is movable in the same manner near the center and at the end of the sleeping device in which the biological signal detecting device is installed, and the pressure-sensitive means is greatly deformed, so that it is high regardless of the sleeping position. A biological signal detection apparatus that detects a biological signal with sensitivity can be provided.

  In the second invention, particularly in the first invention, since the pressing member is connected and supported by the connecting member so as to move up and down, the same applies to the vicinity and the end of the sleeping device in which the biological signal detecting device is installed. In addition, since the pressing member is movable and the pressure-sensitive means is greatly deformed, it is possible to provide a biological signal detection device that detects a biological signal in the vertical direction with high sensitivity regardless of the sleeping position.

  In the third invention, particularly in the first invention, since the plurality of pressing members are connected and supported by the connecting member so as to be movable in the lateral direction, the end is also provided near the center of the sleeping device in which the biological signal detecting device is installed. Similarly, since the pressing member is movable and the pressure-sensitive means is greatly deformed in the section, it is possible to provide a biological signal detection device that detects a lateral biological signal with high sensitivity regardless of the sleeping position.

  In the fourth aspect of the invention, particularly in the second aspect, since the connecting member for connecting and supporting the plurality of pressing members is constituted by an elastic member, the pressing member can be easily moved up and down. A device can be provided.

  In the fifth aspect of the invention, in particular, in the second aspect of the invention, a part of the pressing member is connected and supported by the connecting member, and is configured to move with the connecting member as a fulcrum. Since the pressure member that moves is largely deformed by the movable pressing member, it is possible to provide a biological signal detection device that detects a biological signal in the vertical direction with high sensitivity.

  In the sixth aspect of the invention, in particular, in the fifth aspect of the invention, one end of the plurality of pressing members is connected and supported by the connecting member and the other end is movable, so that the other end can be easily moved up and down with the connecting member as a fulcrum. Therefore, it is possible to provide a biological signal detection device that detects a biological signal in the vertical direction with high sensitivity regardless of the sleeping position.

  In the seventh aspect of the invention, in particular, in the fifth aspect of the invention, the plurality of pressing members are connected and supported at the center by the connecting member, and both ends are movable. Therefore, the entire other end can be easily moved up and down using the connecting member as a fulcrum. Since it is movable, it is possible to provide a biological signal detection device that detects a biological signal in the vertical direction with high sensitivity regardless of the sleeping position. Moreover, since it becomes an object shape centering on a connection member, a highly sensitive biosignal detection apparatus can be provided irrespective of installation direction.

  In the eighth aspect of the invention, in particular, in the invention according to any one of the fifth to seventh aspects, the portion of the pressing member that is not connected and supported by the connecting member is supported by the elastic member. Since the pressure-sensitive means easily deforms with respect to the pressure due to the pressure and is easily restored to the original shape when the pressure is lost, it is possible to provide a highly sensitive biological signal detection device.

  In a ninth aspect of the invention, in particular, in the invention according to any one of the first to eighth aspects, the plurality of pressing members are made of metal, the connecting member uses a conductive member, and the pressing member and the connecting member are directly connected. Since the contact member is configured to contact, the pressing member and the connecting member serve as an electromagnetic shield and are not easily 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 Can be provided.

  In the tenth aspect of the invention, in particular, in the invention according to any one of the first to ninth aspects, the pressure-sensitive means is supported by the elastic member. Since it easily deforms and is easily restored to its original shape when the pressure is lost, a highly sensitive biological signal detection device can be provided.

In the eleventh aspect of the invention, in particular, in the invention according to any one of the first to tenth aspects, since the pressure-sensitive means is a cable-like piezoelectric sensor, the external electrode is shielded from the central electrode that transmits the detected biological signal. It becomes a thing that is not easily 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 Can be provided.

  In a twelfth aspect of the invention, in particular, in the invention according to any one of the first to eleventh aspects, the biological signal detection device is installed in a sleeping device such as a bed, and the biological leg on the sleeping device is connected to the biological signal. Since the chest is located from the shoulder of the living body to the movable end of the biological signal detection device because the detection device is installed so as to be a movable end, the biological signal detection device with high sensitivity for obtaining a larger piezoelectric sensor output 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 side sectional view of a biological signal detection device when no biological load is applied, FIG. 2 is a partial plan sectional view of the biological signal detection device, and FIG. 3 is a biological signal detection according to the first embodiment of the present invention. FIG. 4 and FIG. 5 are sectional views of the bed in which the biological signal detection device is installed. FIG. 6 is a cross-sectional view of the pressure sensing means, and FIG. 8 is a block diagram of the biological signal detection device.

  1 and 2, the biological signal detection device 4 includes two pressing plates (pressing members) 6a and 6b made of a metal plate having a plurality of projections and depressions 5 arranged in parallel and substantially at equal intervals, and a metal or hard A base member 7 made of resin, a pressure-sensitive means 8 having flexibility, a support body 9 made of an elastic member such as sponge or rubber for holding the pressure-sensitive means 8, and a metal coil for supporting the pressing plate at both ends It consists of a spring 10 (connection member). A plurality of coil springs 10 are installed at the portions of the end portions of the pressing plates 6a and 6b where there are no irregularities 5, and in this example, they are installed at the four corners of the pressing plate as shown in FIG. The base member 7 is disposed at the installation portion of the coil spring 10 of the pressing plate 6b and supports the pressing plate 6b so that the pressing plate 6b does not bend due to a load applied to the pressing plate 6b. When the load or vibration is applied to the pressing plates 6a and 6b due to the elasticity of the coil spring 10, the pressing plates 6a and 6b move up and down. In FIG. 1, since no load is applied to the biological signal detection device 4, the pressure sensing means 8 is not deformed, and the coil spring 10 is not compressed.

  At this time, a single cable-shaped piezoelectric sensor 8 is used as the pressure-sensitive means 8 and is meandered between the pressing plates 6a and 6b as shown in FIG. At this time, a groove is carved in the support 9 so that the piezoelectric sensor 8 does not move, and the piezoelectric sensor 8 is held by being fitted into the groove. The unevenness 5 of the pressing plates 6a and 6b is formed by bending a metal plate by, for example, pressing. Therefore, the unevenness 5 on the lower surface of the pressing plates 6a and 6b has the unevenness 5 when viewed from the upper surface. And the unevenness | corrugation 5 of the press plates 6a and 6b is arrange | positioned so that it may become the same position, when it piles up and installs as the biosignal detection apparatus 4. FIG.

  In this example, the unevenness 5 and the piezoelectric sensor 8 intersect at a plurality of points at an angle of about 90 degrees. Further, the unevenness 5 is formed in a direction that is parallel to the height direction of the living body when the living body goes to sleep.

  A control unit 11 that processes an output signal from the piezoelectric sensor 8 is connected to one end of the piezoelectric sensor 8.

Below, the operation | movement effect | action of the biosignal detection apparatus 4 is demonstrated. 3 and 4, the biological signal detection device 4 is disposed on the floor plate 13 of the bed 12, a mattress 14 is disposed thereon, and a human body 15 that is a living body is sleeping on the mattress 14. At this time, vibration caused by a biological signal such as a heartbeat from the human body 15 is transmitted through the mattress 14 and reaches the biological signal detection device 4. At that time, the coil spring 10 is compressed, and the piezoelectric sensor 8 enters the depression of the unevenness 5 of the pressing plate 6b installed on the lower surface together with the support 9 along the cross-sectional shape of the unevenness 5 of the pressing plate 6a. A large bending action is added to the signal to generate a large signal output. Further, when there is no load or vibration, the original shape is restored together with the piezoelectric sensor 8 due to the restoring force due to the elasticity of the coil spring 10 and the restoring force due to the elasticity of the support 9. Further, since the unevenness 5 is arranged on the plate-like pressing plates 6a and 6b, the plate itself is bent and deformed. For example, due to the load and vibration at the center of the mattress 14, the center portion of the mattress 14 is greatly deformed and is high. Biological signals can be detected with sensitivity.

  Further, even when the human body 15 goes to the end of the mattress 14 as shown in FIG. 4 or moves to the end of the mattress 14 by turning over or the like, the coil spring 10 on the side on which the human body 15 is sleeping contracts due to elasticity. Since a large signal output is generated by applying a bending action to the piezoelectric sensor 8, it is possible to detect a biological signal with high sensitivity in the vicinity of the center and at the end of the mattress 14.

  In the experiment, by using the piezoelectric sensor 8 having a diameter of about 2.5 mm and arranging a plurality of irregularities 5 having a height of about 10 mm on the metal plate having a thickness of 0.8 mm as the pressing plates 6a and 6b, at intervals of 30 to 100 mm, Good results could be obtained.

  Further, the installation area of the biological signal detection device 4 will be described. The dimension in the width direction is set to a value larger than the shoulder width of the human body 15 and smaller than the width of the floor board 13 based on the standard body shape of an adult. The vertical dimension is set so that at least a part of the chest will hang from the head of an adult subject to use, and at a position on the bed where at least a part of the chest will hang from the head. Is done. And by setting it as such a size and installation position, since the biological signal detection apparatus 4 is arrange | positioned in the area | region which can transmit the vibration from the human body 15 even if the sleeping position of the human body 15 shifts by turning over etc. The biological signal generated from the human body 15 can be sufficiently detected regardless of the sleeping position.

  Further, in the biological signal detection device 4 of the present invention, the piezoelectric plates 8 are sandwiched between the pressing plates 6a and 6b and the metallic coil spring 10, so that the pressing plates 6a and 6b and the coil spring 10 serve as an electromagnetic shield. It will be less susceptible to electromagnetic noise. Therefore, the reliability with which noise is not superimposed on the piezoelectric sensor 8 even when an electronic device is used near the bed or a communication device such as a mobile phone is used near the bed to collect and process biological signals. It is possible to provide the biological signal detection device 4 having high characteristics.

  Further, since the biological signal detection device 4 of the present invention is installed between the bed floor plate 13 and the mattress 14, the mattress 14 is interposed between the biological signal detection device 4 and the human body 15, and is not in direct contact with each other. It can be a thing which does not disturb bedtime.

  In addition, regarding the arrangement | positioning location of the biosignal detection apparatus 4, it is not restricted to this Embodiment, It may be between a floor or a tatami mat and a mattress.

  In addition, in this example, the example in which the biological signal detection device 4 is installed in the bedclothing such as a bed has been described, but the present invention is not limited to this, and it may be installed in a chair or a cushion. That is, if it is a household article which receives a human body load continuously, it will become possible to detect a biological signal like this Embodiment. In that case, the biological signal detection device 4 of the present embodiment is installed, for example, between a seat surface of a chair and a cushion, and between a tatami mat and a cushion.

  The support 9 and the piezoelectric sensor 8 are fixed by fitting, but may be fixed by an adhesive or an adhesive tape.

  In addition, the height and the arrangement interval of the unevenness 5 are only one example, and the effect of the invention is not limited thereto. Further, in the present embodiment, the unevenness 5 is arranged in a direction parallel to the height direction of the sleeping living body 15, but may be a direction orthogonal to the height direction, and in this case, the piezoelectric sensor 8 also has the unevenness 5 accordingly. Are arranged so as to be orthogonal to each other.

  In addition, although the example in which the coil spring 10 is used as the supporting member for the pressing members 6a and 6b has been shown, the present invention is not limited to this, and the same effect can be obtained by using a leaf spring, rubber, sponge, or conductive rubber.

  Further, the installation positions of the coil springs 10 are not limited to the four corners of the pressing plates 6a and 6b, and may be installed at the center or the like.

  Moreover, although the example which uses press board 6a, 6b as a press member was shown, it is not restricted to this, Even if it uses block-shaped press block 16a, 16b like FIG. 6, the same effect is obtained.

  Hereinafter, the piezoelectric sensor 8 used in the biological signal detection apparatus 4 of the present invention will be described.

  In FIG. 7, the piezoelectric sensor 8 includes a central electrode 801 made of a conductor as an inner electrode, a piezoelectric layer 802 which is a pressure-sensitive member, an outer electrode 803 made of a conductor, and a coating layer 804 made of an elastic body. For the piezoelectric layer 802, 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 base material can be used. The outer electrode 803 is disposed so as to surround the inner electrode 801 and the piezoelectric layer 802. Since the piezoelectric sensor 8 has a coaxial cable shape, the outer electrode 803 serves as a shield with respect to the center electrode 801 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 cause noise to be superimposed. A high biological signal detection device 4 can be provided. In particular, a greater effect is exhibited when the supporting members such as the pressing members 6a and 6b and the coil spring 10 are made of non-conductive members.

  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 8 and an operation of detecting a biological signal from the human body 15 will be described. FIG. 8 is a block diagram of the biological signal detection device 4 according to the first embodiment of the present invention. In FIG. 6, the control unit 11 includes a detection unit 17, a determination unit 18, and a notification unit 19. The detection means 17 filters the output signal from the piezoelectric sensor 8 with a predetermined filtering characteristic and amplifies the output signal with a predetermined amplification degree. The output signal of the filter section 20 is set to a preset value. And a comparator unit 21 for comparison. As the filtering characteristics of the filter unit 20, for example, commercial power supply frequencies that are likely to be superimposed on a signal as noise are 50 Hz and 60 Hz, but a signal of the living body 15 such as a heartbeat is around 1 Hz, respiration is around 0.1 Hz, body motion Are in the range of several Hz, and the filtering characteristic is, for example, a bandpass filter that passes a signal component of 0.05 Hz to 20 Hz.

  The operation and action of the biosignal detection device 4 configured as described above will be described with reference to FIG. FIG. 9 is a characteristic diagram showing temporal changes of the output signal V of the filter unit 20 and the output signal J of the comparator unit 21 corresponding to the output of the piezoelectric sensor 8 when vibration derived from the heartbeat of the human body 15 is applied to the piezoelectric sensor 8. It is.

First, as shown in FIG. 4, when the human body 15 lies on the bed, pressure such as weight from the human body 15 and vibration such as heartbeat are applied to the piezoelectric sensor 8 via the mattress 14. At this time, the piezoelectric sensor 8 is deformed, and a signal corresponding to the deformation acceleration of the piezoelectric sensor 8 is output by the piezoelectric effect. For this reason, pressure or the like due to body weight without variation is not detected, but only variation components with variation are detected. For example, body movement, respiration, heartbeat signal, and the like are detected. At this time, the bending deformation of the piezoelectric sensor 8 is increased particularly at the uneven portions 5 of the pressing plates 6a and 6b, and a larger output signal is obtained. The output signal of the piezoelectric sensor 8 passes a signal of 0.05 to 20 Hz, which is a frequency band at the time of contact of vibration from the human body 15 such as a heartbeat, by the filter unit 20, and signals in other frequency bands are removed. The When heartbeat vibration is detected, a signal component larger than the reference potential V ₀ appears in V. And the acceleration which is the secondary differential value of the deformation amount also increases, and as a result, the output signal of the piezoelectric sensor also increases. The comparator unit 21 is amplitude from _{V 0} which _V | V-V ₀ | is determined to detect 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 21 is input to the determination means 18, and the heartbeat period, that is, the heart rate is known from the period Δt of the heartbeat signal, for example, and the notification means 19 displays the heart rate or reports it by voice. can do.

(Embodiment 2)
A biological signal detection apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 10 is a side view of the biological signal detection device, FIG. 11 is a plan view, and FIG. 12 is a side sectional view of the bed on which the biological signal detection device is installed.

  The difference from the first embodiment is that the two pressing plates 6a and 6b of the biological signal detection device 4 are connected and supported using a hinge as a connecting member. The thing of the same code | symbol as Embodiment 1 shows the same operation | movement, an effect | action, and an effect, and abbreviate | omits description.

  As shown in FIG. 10, the upper and lower pressing plates 6a and 6b are connected at one end in a U-shape using a hinge 22 and an L-shaped metal fitting 23, so that the other end is as shown by an arrow A with the hinge 22 as a fulcrum. Move freely. In addition, an elastic member such as a coil spring 24 is disposed at the other end to restore the load applied to the pressing plates 6a and 6b and the force compressing the vibration. As shown in FIG. 11, the hinge 22 is arranged at an end portion that intersects the unevenness 5 arranged on the pressing plates 6 a and 6 b, and this biological signal detection device is arranged on the hinge 22 as shown in FIG. 12. The side is arranged on the head side of the human body 15 and the movable end portion is arranged on the leg side. FIG. 11 shows an example in which the hinges 22 are installed at two places on the left and right end portions without the unevenness 5, but the present invention is not limited to this, and the hinges 22 may be installed at two or more places between the unevenness 5 arranged in a row. Good.

  When vibration due to a load, a heartbeat, or the like is applied to the biological signal detection device 4, the pressing plates 6a and 6b vibrate up and down with the hinge 22 as a fulcrum and the piezoelectric sensor 8 sandwiched between the pressing plates 6a and 6b. Deform and output a signal. This is the same at the center and the end of the biological signal detection device 4.

  Therefore, even if the human body 15 sleeps in the center of the bed 12 or sleeps at the end of the bed 12, the same high detection sensitivity can be obtained regardless of the sleeping position.

  Further, since the movable end portion without the hinge 22 is arranged to be on the leg side of the human body 15, the chest portion is located on the movable end surface of the biological signal detection device 4 from the shoulder of the human body 15, so that the larger piezoelectric sensor 8. Output can be obtained.

  If the support 9 of the piezoelectric sensor 8 has sufficient elasticity and restoring force, the structure without the coil spring 10 may be used.

(Embodiment 3)
A biological signal detection apparatus according to the third embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a side view of the biological signal detection device, and FIG. 14 is a side sectional view of the bed on which the biological signal detection device is installed.

  The difference from the first and second embodiments is that two pressing plates are connected and supported at the center of the pressing plate end. Components having the same reference numerals as those in the first and second embodiments show similar operations, functions, and effects, and description thereof is omitted.

  As shown in FIG. 13, the upper and lower two pressing plates 6 a and 6 b are connected to each other by a joint 25 (connecting member) at the center of both right and left ends, and the joint 25 rotates around the shaft 26 and the shaft 26. It consists of two arms 27a and 27b. As a result, the pressing plate 6a moves as shown by the arrow B about the joint 25, and therefore when the vibration due to a load or a heartbeat is applied to the biological signal detection device 4, the pressing plate 6a is sandwiched between the pressing plates 6a and 6b. The piezoelectric sensor 8 is deformed to output a signal. In addition, the elasticity of the support 9 of the piezoelectric sensor 8 restores the load or vibration compressing force.

  In this way, since the joint 25 is arranged so that the center of the pressing plates 6a and 6b serves as a fulcrum, as shown in FIG. It is possible to provide a biological signal detection device 4 that is highly reliable and easy to use without causing a difference in sensitivity.

  In addition, it is good also as a structure which arrange | positions a spring in the four corners of the press plates 6a and 6b, and obtains restoring force with respect to a press.

  Further, as shown in FIG. 15, a columnar member 28 having no shaft may be used as the connecting member. In that case, when the pressing plate 6a is bent, both ends of the pressing plate 6a are moved, and the same effect is obtained.

(Embodiment 4)
A biological signal detection apparatus according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 16 is a cross-sectional view of a main part of the biological signal detection device.

  The difference from the first to third embodiments is that the pressing blocks 29a and 29b (pressing members) are configured to move in the lateral direction.

As shown in FIG. 16A, a bearing 30 and a roller 31 (a connecting member) that rotates within the bearing 30 are fixed to the end of the lower pressing block 29 b, and the upper pressing is performed on the roller 31. A plate 29a is disposed and is movable in the direction of arrow C. A stopper 32 is disposed on the upper pressing block 29a, and the amount of movement is restricted so that the movable upper pressing block 29a does not move excessively and come off. As shown in FIG. 16B, when vibration due to a heartbeat or the like is applied to the biological signal detection device 4, the unevenness 5 of the upper pressing block 29 a that has moved on the roller 31 causes the piezoelectric sensor 8 to move downward. The signal can be output with high sensitivity by being deformed so as to be pressed laterally against the unevenness 5 of the pressing plate 29b. In general, the human body has a vibration component due to a reaction of a blood flow pumped from the heart to an artery together with a vibration component due to the heartbeat, so the mattress and the biological signal detection device 4 have only a vertical direction. In addition, since a lateral vibration component is also added, it is possible to detect a biological signal with such a configuration. In addition, with this configuration, the pressing block 29a moves in the same manner when sleeping at the center of the bed or when sleeping at the end of the bed, so that it is possible to detect a biological signal with high sensitivity regardless of the sleeping position. Can do.

  The size of the biological signal detection device 4 may be the same as that of the first to third embodiments, but as shown in FIG. 17, the size of the biological signal detection device 4 is set to the same size as the mattress 14 and is pressed by friction between the mattress 14 and the floor board 12. The biological signal can be detected with higher sensitivity if the lateral movement of 29a is not suppressed.

  In the present embodiment, the example in which the pressing blocks 29a and 29b are used as the pressing members has been described. However, the same operation and effect can be obtained with the pressing plate as in the first to third embodiments.

  In addition, the shape of the roller 31 may be cylindrical or spherical.

  In addition, instead of the rotating members such as the roller 31 and the bearing 30 as the connecting member, a material having a very low coefficient of friction, for example, a fluororesin block or the like is installed so as to face the pressing blocks 29a and 29b. It is good also as a structure which slides on the press block 29b.

  In the first to fourth embodiments, the cable-shaped piezoelectric sensor 8 is used as the pressure-sensitive means. However, other types of piezoelectric sensors may be used as the pressure-sensitive means, for example, both surfaces of the PVDF thin film used in the fourth embodiment as the pressure-sensitive means. A similar effect can be obtained by using a film-like or ribbon-like piezoelectric sensor having electrodes sandwiched between electrodes.

  In the first to fourth embodiments, the piezoelectric sensor 8 is used as the pressure-sensitive means. However, an optical fiber having a characteristic that the transmitted light is modulated in response to the pressure deformation may be used as the pressure-sensitive means. There is a similar effect.

  As described above, the biological signal detection device according to the present invention has a plate-like member having a plurality of convex portions arranged on the piezoelectric sensor, so that the biological signal can be detected with high sensitivity, and the bed can be simply set as described above. It can be used for acquiring a biosignal by installing it in a relaxation device such as a massage chair, a car seat, a seat in an amusement facility, and the like. Further, the present invention is applicable not only to a human body such as a pet mat, but also to uses for detecting biological signals of animals.

Side surface sectional drawing of the biological signal detection apparatus in Embodiment 1 of this invention. Plan sectional drawing of the biological signal detection apparatus in Embodiment 1 of this invention Configuration diagram of a bed in which a biological signal detection device according to Embodiment 1 of the present invention is arranged Sectional drawing of the bed which has arrange | positioned the biosignal detection apparatus in Embodiment 1 of this invention. Sectional drawing of the bed part edge sleeping state which has arrange | positioned the biological signal detection apparatus in Embodiment 1 of this invention Sectional drawing of another form of the bed which has arrange | positioned the biosignal detection apparatus in Embodiment 1 of this invention. Sectional drawing of the piezoelectric sensor in Embodiment 1 of this invention 1 is a block diagram of a biological signal detection apparatus according to Embodiment 1 of the present invention. FIG. 5 is a characteristic diagram showing temporal changes of the output signal V of the filter unit and the output signal J of the comparator unit when receiving the biological signal from the human body in the biological signal detection device according to the first embodiment of the present invention. Side view of biological signal detection apparatus according to Embodiment 2 of the present invention. Plan sectional drawing of the biological signal detection apparatus in Embodiment 2 of this invention Side surface sectional drawing of the bed which has arrange | positioned the biosignal detection apparatus in Embodiment 2 of this invention. Side view of biological signal detection apparatus according to Embodiment 3 of the present invention. Side surface sectional drawing of the bed which has arrange | positioned the biological signal detection apparatus in Embodiment 3 of this invention. Side view of the biological signal detection apparatus in another form of Embodiment 3 of the present invention. (A) Side view of the biological signal detection device according to the fourth embodiment of the present invention (b) Side view of the biological signal detection device according to the fourth embodiment of the present invention Side surface sectional drawing of the bed which has arrange | positioned the biosignal detection apparatus in Embodiment 4 of this invention. Configuration diagram of conventional biological signal detection device

Explanation of symbols

4 biological signal detection device 5 unevenness (plural unevenness of the pressing member)
6a, 6b pressing plate (pressing member having a plurality of irregularities)
8 Piezoelectric sensor (flexible pressure-sensitive means)
9 Support (elastic member that supports pressure-sensitive means)
10 Coil spring (connection member)
16a, 16b pressing block (pressing member having a plurality of irregularities)
22 Hinge (connecting member)
25 Fitting (connecting member)
28 Cylindrical member (connecting member)
29a, 29b pressing block (pressing member having a plurality of irregularities)
30 Bearing (connecting member)
31 Roller (connection member)

Claims (12)

A pressure-sensitive means having flexibility for detecting pressure fluctuations generated by a living body; and a plurality of pressing members having a plurality of projections and depressions arranged so as to intersect the pressure-sensitive means. A biological signal detection apparatus configured to be arranged so as to sandwich the means, wherein the pressure-sensitive means is pressed and deformed by the unevenness of the pressing member, and the plurality of pressing members are connected and supported by a connecting member so as to move relative to each other. The biological signal detection device according to claim 1, wherein the pressing member is connected and supported by a connecting member so as to move up and down. The biological signal detection device according to claim 1, wherein the plurality of pressing members are connected and supported by a connecting member so as to move in a lateral direction. The biological signal detection device according to claim 2, wherein the connecting member that connects and supports the plurality of pressing members is formed of an elastic member. The biological signal detection device according to claim 2, wherein a part of the pressing member is connected and supported by a connecting member, and is movable with the connecting member as a fulcrum. The biological signal detection device according to claim 5, wherein one end of the plurality of pressing members is connected and supported by a connecting member, and the other end is movable. The biological signal detection device according to claim 5, wherein a plurality of pressing members are connected and supported at the center by a connecting member, and both ends are movable. The biological signal detection device according to claim 5, wherein a portion of the pressing member that is not connected and supported by the connecting member is supported by an elastic member. The biological signal detection device according to claim 1, wherein the plurality of pressing members are made of metal, the connecting member is a conductive member, and the pressing member and the connecting member are in direct contact with each other. . The biological signal detection apparatus according to claim 1, wherein the pressure sensitive means is configured to be supported by an elastic member. The biological signal detection device according to any one of claims 1 to 10, wherein the pressure-sensitive means is a cable-shaped piezoelectric sensor. The biological signal detection device according to any one of claims 1 to 11 is installed in a sleeping device such as a bed, and a leg side of the biological body on the sleeping device is a movable end of the biological signal detection device. A sleeping device installed.

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