JP2008284001A - Biological signal detection device and sleeping apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact biological signal detection device capable of being set or moved without labors and capable of being easily stored. <P>SOLUTION: The biological signal detection device 4 includes a flexible pressure sensitive means 2, a single or a plurality of flexible cord-like members 3 overlapping and crossing the pressure sensitive means 2, and a flexible film-like member 1. The pressure sensitive means 1 and the cord-like member 3 are integrally disposed on the film-like member 1. Since the cord-like members 3 are flexible, the biological signal detection device 4 can be bent in any directions, and therefore, the device can be carried to be set in a desired place, or can be stored by taking up or folding the device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a biological signal detection device that detects a signal such as a heartbeat and a sleeping device such as a bed using the biological signal detection device.

  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. .

  Specifically, as shown in FIGS. 18 and 19, pressure-sensitive means 103 is installed in a meandering manner on a hard member 102 having a plurality of parallel holes 101 a to 101 d, and the pressure-sensitive means 103 is placed on a bed floor board 104 and a mattress 105. It is installed between.

  A large signal is obtained because a large bending deformation is applied to the pressure-sensitive means 103 at the edges of the holes 101a to 101d (for example, the point 106) due to vibration from a living body sleeping on the bed (see, for example, Patent Document 1). .

In addition, as shown in FIG. 20, an optical fiber 107 for detecting a signal is sandwiched between a pair of concavo-convex members 108a and 108b, and when the vibration from a living body is applied, the optical fiber 107 is largely bent to obtain a large signal. (For example, see Patent Document 2).
JP 2005-13259 A JP-A-8-584

  However, in the conventional configuration, the hard member 102 is about the same size as a bedding and is bulky, so it takes time to install and move, and the hard member 2 or the uneven members 107a and 107b are hard. For this reason, there has been a problem that it is difficult to store small.

  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 apparatus of the present invention includes a flexible pressure-sensitive means, and a single or a plurality of flexible strings that overlap the pressure-sensitive means and intersect the pressure-sensitive means. And a flexible film member, and the pressure-sensitive means and the string-like member are integrally arranged on the film member.

  Accordingly, the biological signal detection device can be bent in any direction, and can be carried, for example, wound up or folded, installed in a desired place, or stored.

  The biological signal detection device of the present invention can be wound or folded, and can provide a product with good installation and storage.

  The first invention includes a pressure-sensitive means having flexibility, a single or a plurality of flexible string-like members that overlap the pressure-sensitive means and intersect the pressure-sensitive means, and a flexible film member, The pressure-sensitive means and the string-like member are configured to be integrated with the film member.

  By this, since the detection means with flexibility and each of the single or plural string-like members are installed on the flexible film member, the biological signal detection device can be bent in any direction, For example, it can be rolled up and folded and carried at the desired location. In addition, it is possible to provide a biological signal detection device that can be wound and folded and stored and has good installation property and storage property.

  The second invention is the first invention, particularly in the first invention, the string-like members are arranged in a lattice shape, the intersection of the pressure-sensitive means and the string-like member can be made at a larger number of points, and high sensitivity without impairing flexibility. A biological signal detection apparatus can be provided.

  According to a third aspect of the invention, in particular, in any one of the first and second aspects, the elastic member is provided, and the film member is integrally disposed so as to sandwich the pressure-sensitive means between the string-like member and the elastic member. Therefore, it is possible to bend it in any direction, so that it can be taken up and carried around, installed and stored in a desired place, and a biosignal detection device with good installation property and storage property is provided. Can do. Even if the pressure sensing device is disposed upside down, the pressure sensing means is subjected to a bending action along the cross-sectional shape of the rod-like member and a large signal output is generated, so that a biological signal can be detected with high sensitivity. Therefore, it is possible to provide an easy-to-use biological signal detection device that does not need to consider the front and back sides.

  In a fourth aspect of the invention, particularly in the third aspect of the invention, the elastic member has a plurality of elastic members, and is arranged integrally with the film member so that the pressure-sensitive means is sandwiched between the string-like member and the elastic member. Since the pressure-sensitive means is flexible and the plurality of rod-shaped elastic members are separated, the living body is oriented in a direction perpendicular to the elastic member and the string-shaped member. It becomes easy to bend or round the signal detection device, and the installation property and the storage property are improved.

  According to a fifth aspect of the present invention, there is provided a pressure-sensitive means having flexibility, a first single or a plurality of string-like members that overlap the pressure-sensitive means and intersect the pressure-sensitive means, and the first plurality of string-like members. A second single or a plurality of string-like members sandwiching the pressure-sensitive means together with the member, and the first string-like member and the second string-like member are arranged so as not to overlap each other Therefore, since it can be bent in any direction, it can be taken up, folded and carried, installed and stored in a desired place, and a biosignal detection device with good installation and storage can be provided. . In addition, it is possible to provide an easy-to-use biological signal detection device that does not need to consider the front and back sides.

  In the sixth aspect of the invention, in particular, in the fifth aspect of the invention, the string-like members are arranged in a lattice shape to form a net-like shape, so that the intersection of the pressure-sensitive means and the string-like member can be made at a larger number of points. It is possible to provide a biological signal detection device with high sensitivity without impairing the above.

  In a seventh aspect of the invention, in particular, in the invention according to any one of the first to sixth aspects, the pressure sensitive means having flexibility includes an inner electrode, a pressure sensitive member, and an outer electrode surrounding the inner electrode. Since the cable-shaped piezoelectric sensor is used, the external electrode serves as a shield with respect to the central electrode for transmitting a signal and is not easily influenced by external electromagnetic noise.

  Therefore, a highly reliable biological signal detection apparatus is provided that is less likely to cause noise superimposition 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 do.

  Since the eighth invention is arranged between the flexible member arranged under the living body and the structure supporting the flexible member, particularly in the invention according to any one of the first to seventh aspects, from the human body When the vibration is transmitted through the flexible member and reaches the biological signal detection device, the pressure-sensitive means is bent along the cross-sectional shape of the rod-like member and a large signal output is generated, so the biological signal is detected with high sensitivity. can do. In addition, since the flexible member is interposed between the human body and the biological signal detection device, the rod-shaped member or the like does not directly contact the human body, so that the sleeping can be prevented.

  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)
In FIG. 1 (a), pressure-sensitive means 2 composed of a flexible cable-like piezoelectric sensor is meandered and sewn on the surface of a flexible film-like member 1 such as cloth. In b), on the back side, a plurality of flexible string-like members 3 made of cotton string are sewn in parallel with each other at substantially equal intervals to form the biological signal detection device 4.

  By arranging as in this example, the string-like member 3 and the pressure-sensitive means 2 intersect at a plurality of points at an angle of about 90 degrees. A control unit 5 for processing an output signal from the output terminal of the pressure sensing means 2 is connected to the output terminal.

  FIG. 2 shows an example of a sleeping apparatus, in which a biological signal detection device 4 is arranged on a floor plate 6 of a bed with the pressure-sensitive means 2 sewn on the upper surface, and a mattress 7 is set thereon. . The figure shows a state in which a human body 8, which is a living body, is sleeping.

  At this time, vibration from the human body 8 is transmitted through the mattress 7 and reaches the biological signal detection device 4. At that time, a bending action is applied to the pressure-sensitive means 2 to generate a large signal output.

  In the experiment, good results could be obtained by using a pressure-sensitive means 2 composed of a piezoelectric sensor having a diameter of about 2.5 mm and arranging a plurality of string-like members 3 having a diameter of 6 mm at intervals of 50 to 100 mm. Further, the installation length A of the pressure-sensitive means 2 is set to a value larger than the shoulder width of the human body 8 and smaller than the width of the floor board 6. Thereby, the pressure-sensitive means 2 can receive vibration from the human body 8 even when the sleeping position of the human body 8 is shifted.

  As shown in FIGS. 3A and 3B, the pressure-sensitive means 2 has flexibility, and the string-like member 3 also has flexibility. The detection device 4 can be bent or rounded.

  For example, since it can be bent in a direction perpendicular to the pressure-sensitive means 2 as shown in (a) and in a direction perpendicular to the string-like member 3 as shown in (b), installation and storage are facilitated.

  In addition, since the mattress 7 is interposed between the biological signal detection device 4 and the human body 8 because it is installed between the bed floor 6 and the mattress 7, the pressure-sensitive means 2 and the string-like member 3 are directly attached to the human body 8. There is no contact and it can be a thing which does not disturb bedtime.

  In addition, regarding the arrangement | positioning location to the sleeping apparatus 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 this example, the example in which the biological signal detection device 4 is installed in a sleeping device such as a bed has been described. However, the present invention is not limited to this, and it may be installed in a chair or a cushion. In that case, for example, it is installed between the seat surface of the chair and the cushion, and between the tatami mat and the cushion.

  Further, the film-like member 1 is not limited to cloth, and a resin sheet or the like may be used, and the string-like member 3 may be a synthetic fiber or chemical fiber string in addition to a natural fiber string such as cotton.

  The attachment of the pressure-sensitive means 2, the piezoelectric sensor 1, and the string-like member 3 to the film-like member 1 is not limited to sewing, and a method such as adhesion may be considered.

  The diameter and arrangement interval of the string-like members 3 are examples, and are not limited thereto.

  Moreover, although the example using multiple string-like members 3 was shown, as shown in FIG. 4, you may arrange | position the one string-like member 3 meandering.

  Hereinafter, the piezoelectric sensor 9 used for the pressure-sensitive means 2 of the biological signal detection device 4 will be described.

  In FIG. 5, the piezoelectric sensor 9 includes a central electrode 10 made of a conductor as an inner electrode, a piezoelectric layer 11 that is a pressure-sensitive member, an outer electrode 12 made of a conductor, and a coating layer 13 made of an elastic body.

  The piezoelectric layer 11 may be a resin-based polymer piezoelectric material such as polyvinylidene fluoride, or a composite piezoelectric material in which a piezoelectric resin powder is mixed in a specific resin base material. The outer electrode 12 is disposed so as to surround the center electrode 10 and the piezoelectric layer 11.

  Since the piezoelectric sensor 9 has a coaxial cable shape, the external electrode 12 serves as a shield with respect to the center electrode 10 that transmits a signal, and is hardly affected by 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 9 is less likely to be superimposed on noise. A high biological signal detection device 4 can be provided.

  In addition, although the coaxial cable-shaped piezoelectric sensor 9 having the center electrode 10 and the outer electrode 12 is shown as an example, a cable having a plurality of center conductors, a cable in which the center conductor is eccentric from the center of the outer electrode, and a cross-sectional shape are shown. The same effect can be obtained by using a non-circular cable.

  Next, an example of processing of the output signal of the pressure-sensitive means 2 and the action of detecting a biological signal from the human body 8 will be described. In FIG. 5, the control unit 14 includes a detection unit 15, a determination unit 16, and a notification unit 17. The detection means 15 filters the output signal from the pressure sensing means 2 with a predetermined filtering characteristic and amplifies the output signal with a predetermined amplification degree, and the output signal of the filter section 18 is set in advance. A comparator unit 19 for comparing the values is provided.

  As for the filtering characteristics of the filter unit 18, 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 8, 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 biological signal detection apparatus 4 configured as described above will be described with reference to FIGS.

  FIG. 8 shows temporal changes in the output signal V of the filter unit 18 and the output signal J of the comparator unit 17 corresponding to the output when vibration derived from the heartbeat of the human body 8 is applied to the pressure-sensitive means 2.

  First, as shown in FIG. 7, when the human body 8 lies on the bed, pressure such as weight and vibration such as heartbeat are applied to the pressure-sensitive means 2 via the mattress 7. At this time, when the pressure-sensitive means 2 is a piezoelectric sensor, the piezoelectric sensor is deformed, and a signal corresponding to the deformation acceleration of the piezoelectric sensor 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 pressure-sensitive means 2 is increased particularly in the portion of the string-like member 3, and a larger output signal is obtained.

  Then, the output signal of the pressure sensing means 2 passes a signal of 0.05 to 20 Hz, which is a frequency band at the time of contact of vibration from a human body such as a heartbeat, by the filter unit 18, and signals of other frequency bands are removed. The

FIG. 8 shows the output signal V of the filter unit 18. 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 pressure sensitive means 2 also increases. Comparator unit 19 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 19 is input to the determination unit 16. 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 17 displays the heart rate or reports it by voice. You can.

(Embodiment 2)
FIG. 9 shows the second embodiment, which is different from the first embodiment in that the string-like members 3 are arranged in a lattice shape.

  By doing so, the pressure-sensitive means 2 and the string-like member 3 arranged in a meandering manner intersect not only at the intersections B1 and B2 in the vertical direction but also at the intersections C1 and C2 in the horizontal direction, thereby impairing flexibility. Higher detection sensitivity.

  As an example of the arrangement of the string-like members 3 in a lattice shape, a structure in which the pressure-sensitive means 2 and the string-like members 3 intersect obliquely as shown in FIG.

(Embodiment 3)
11 and 12 show the third embodiment. The difference from the first and second embodiments is that the elastic member 20 such as a sponge is arranged on the biological signal detection device 4 and the pressure sensitive means 2 is replaced with the sponge 20. And are arranged so as to be sandwiched between the string-like members 3.

  That is, in the example shown in FIG. 11, the sponge 20 is placed on the floor 6 side and the string-like member 3 is placed on the mattress 7 side. The operation will be described below.

  Vibration from the human body 8 is transmitted to the pressure-sensitive means 2 through the mattress 7, the string-like member 3, and the film-like member 1.

  At this time, since the sponge 20 is distorted and the string-like member 3 is not distorted at the body weight of the human body 8, the pressure-sensitive means 2 is recessed into the sponge 20 together with the string-like member 3. As a result, the pressure-sensitive means 2 is string-like. A bending action is applied along the cross-sectional shape of the member 3 to generate a large signal output.

  The hardness of the sponge 20 is preferably such that it is deformed by the weight of the human body 8 and the weight of the mattress 7 but does not collapse. For example, a material having a hardness of about the mattress 7 can be used.

  Moreover, as shown in FIG. 12, you may arrange | position upside down. That is, the string-like member 3 is arranged on the floor plate 6 side and the sponge 20 is arranged on the mattress 7 side. However, since the string-like member 3 is not distorted at the body weight of the human body 8, the sponge 20 is caused by vibration from the human body 8. Distortion occurs, and the pressure-sensitive means 2 and the sponge 20 are depressed by pressing together with the string-like member 3. Therefore, the pressure-sensitive means 2 is bent along the cross-sectional shape of the string-like member 3, and a large signal output is generated.

  As described above, unlike the second and third embodiments, the biological signal detection device 40 can be easily used because it can detect the signal from the human body 8 with high sensitivity even if it is arranged without taking the front and back sides into consideration. it can.

  And since the pressure sensitive means 2, the sponge 20, and the string-like member 3 have flexibility, the biological signal detection apparatus 4 can be bent or rounded, and installation and storage are facilitated.

(Embodiment 4)
13 and 14 show the fourth embodiment, and the difference from the first to third embodiments is that the elastic member 21 such as a bar-like sponge having a plurality of square cross sections is opposed to the string-like member 3 in the biological signal detection device 4. It is a point arranged to do. That is, the pressure-sensitive means 2 is arranged so as to be sandwiched between the elastic member 21 and the string-like member 3. In this example, the elastic member 21 is placed on the floor plate 6 side, and the string-like member 3 is placed on the mattress 7 side.

  Since the pressure-sensitive means 2 has flexibility and the elastic member 21 is separated, the biological signal detection device 4 is bent or rounded in a direction perpendicular to the elastic member 21 and the string-like member 3. This makes it easier to install and improves the installation and storage.

  Of course, you may arrange | position upside down in this structure.

(Embodiment 5)
FIG. 15 shows the fifth embodiment, and the difference from the first to fourth embodiments is that the first string-like member 3a and the second string-like member 3b are arranged in the biological signal detection device 4 to provide the pressure-sensitive means 2. The first and second string-like members 3a and 3b are arranged so as not to overlap each other because they are sandwiched. That is, the first and second string-like members 3a and 3b are arranged in parallel with each other so that the first string-like member 3a is located between the second string-like members 3b.

  Here, the pressure-sensitive means 2 sandwiched between the first and second string-like members 3a and 3b by vibration from the human body 8 bends along the cross-sectional shape of the first and second string-like members 3a and 3b. To generate a large signal output.

  Further, even if the biological signal processing device 4 is used on the back side, since the bending action is applied along the cross-sectional shapes of the first and second string-like members 3a and 3b and a large signal output is generated, the front and back sides are considered. It is possible to provide a biosignal processing device 4 that is easy to use and can be arranged without being included in the storage.

  Here, the 2nd string-like member 3b is arrange | positioned in the intermediate position of the adjacent 1st string-like member 3a. By doing so, the pressure-sensitive means 2 is bent both between the first string-like member 3a adjacent to the right side of the second string-like member 3b and between the first string-like member 3a adjacent to the left side. Since the action occurs, the biological signal can be detected efficiently.

  However, the present invention is not limited to this, and even if the second string-like member is arranged at a position shifted from the intermediate position of the adjacent first string-like member, the biological signal is detected even if there is a slight decrease in efficiency. Is possible.

  Furthermore, the biological signal detection device 4 can be bent or rolled in any direction, and installation and storage are facilitated.

  Moreover, the same effect is acquired even if it makes the 1st, 2nd string-like members 3a and 3b net shape like FIG.

  In the first to fifth embodiments, the same effect can be obtained by using a film-like or ribbon-like piezoelectric sensor in which both sides of a PVDF thin film are sandwiched between electrodes in addition to a cable-like piezoelectric sensor. . However, electromagnetic noise countermeasures such as wrapping and shielding the sensor itself with a conductive sheet are taken as appropriate. Further, the same effect can be obtained by using an optical fiber having a characteristic that the transmitted light is modulated in response to the pressure deformation.

  Further, in addition to the sleeping device, for example, as shown in FIG. 17, the biological signal detection device 4 can be easily installed on the seat surface 23 of the chair 22, for example, a relaxation device such as a chair or a massage chair, a car seat, It can also be applied as a system for detecting a biological signal by installing it in a seat of an amusement facility.

  As described above, the biological signal detection device according to the present invention can be easily bent by including a plurality of string-like members for increasing sensitivity so as to intersect the pressure-sensitive means. There is no need for installation, and as described above, it can be easily installed on a bed and used to acquire a biological signal, and can also be placed on a member having a phase. Moreover, it is applicable also to the use which detects the biological signal of an animal, such as a mat for pets.

(A) is a block diagram of the surface of the biological signal detection apparatus in Embodiment 1 of this invention, (b) is a block diagram of the back surface of the biological signal detection apparatus. Configuration diagram of a bed in which a biological signal detection device according to Embodiment 1 of the present invention is arranged (A) is the perspective view of the bent biological signal detection apparatus in Embodiment 1 of this invention, (b) is the perspective view which bent the biological signal detection apparatus to another direction. Configuration diagram of another form of biological signal detection apparatus according to Embodiment 1 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. Sectional drawing of the principal part when the biological signal detection apparatus in Embodiment 1 of this invention is arrange | positioned to the bed. 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. Configuration diagram of biological signal detection apparatus according to Embodiment 2 The block diagram of the biosignal detection apparatus of another form in Embodiment 2. FIG. Sectional drawing of the principal part when the biological signal detection apparatus in Embodiment 3 of this invention is arrange | positioned on the bed. Sectional drawing of the principal part when the biological signal detection apparatus in Embodiment 3 of this invention is arrange | positioned on the bed. Sectional drawing of the principal part when the biological signal detection apparatus in Embodiment 4 of this invention is arrange | positioned on the bed. The block diagram of the biosignal detection apparatus of another form in Embodiment 4. FIG. Sectional drawing of the principal part when the biological signal detection apparatus in Embodiment 5 of this invention is arrange | positioned on the bed. Configuration diagram of another form of biological signal detection apparatus according to Embodiment 5 The block diagram of the chair which has arrange | positioned the biosignal detection apparatus of the form which shows the availability of this invention 1 is a configuration diagram of a biological signal detection apparatus according to a first conventional example. Sectional drawing of the principal part when the biological signal detection device of the first conventional example is arranged on the bed Configuration diagram of biological signal detection apparatus of second conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Film-like member 2 Pressure sensitive means 3, 3a, 3b String-like member 4 Biosignal detection apparatus 9 Piezoelectric sensor

Claims (8)

A pressure-sensitive means having flexibility; a single or a plurality of flexible string-like members that overlap the pressure-sensitive means and intersect the pressure-sensitive means; and a flexible film-like member; The biological signal detection apparatus which comprised the said string-like member integrally to the said film-like member. The biological signal detection device according to claim 1, wherein the string-like members are arranged in a lattice shape. The biological signal detection device according to claim 1, wherein the biosignal detection device is integrally disposed on the film member so as to sandwich the pressure-sensitive means between the string-like member and the elastic member. A structure having a plurality of elastic members, arranged integrally with the film-like member so as to sandwich the pressure-sensitive means between the string-like member and the elastic member, and the elastic member being arranged at a position overlapping the string-like member. Item 4. The biological signal detection device according to Item 3. The biological signal detection device according to claim 1, comprising a plurality of string-like members that overlap with the pressure-sensitive means and intersect with the pressure-sensitive means, and are arranged so that the plurality of string-like members do not overlap. The biological signal detection device according to claim 5, wherein the string-like member has a net shape. The biological signal according to any one of claims 1 to 6, wherein a cable-shaped piezoelectric sensor configured by an inner electrode, a pressure-sensitive member, and an outer electrode surrounding the inner electrode is used as the pressure-sensitive means having flexibility. Detection device. A sleeping device using the biological signal detection device according to claim 1.

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