JP4022330B2 - Biological signal detection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a biological signal detection apparatus, and in particular, a biological signal detection in which a minute movement of a human body such as a heartbeat (pulse) of a measurement subject in a natural state is detected by a magnetic sensor as a change in a static magnetic field accompanying the movement. Relates to the device.
[0002]
[Prior art]
Conventionally, a biological signal detection device disclosed in Japanese Patent Laid-Open No. 10-80410 is known as a device for detecting and measuring a biological signal composed of respiration, heartbeat (pulse), etc. of a human body without using an electrocardiograph. Yes.
[0003]
The proposed biological signal detection apparatus mainly uses a bed, and an amorphous alloy such as an iron-based, iron / nickel-based, or cobalt-based alloy is formed on the lower portion of the measured person on the bed on which the measured person lies. A sheet-like deformable high permeability member, and a magnetic sensor that is disposed close to the high permeability member and detects deformation of the high permeability member due to the fine movement of the subject as a change in the static magnetic field. A change in a static magnetic field detected by a magnetic sensor is extracted as an electrical signal, and a biological signal is obtained by processing and analyzing the electrical signal.
[0004]
According to the proposed biological signal detection device, when detecting and measuring a biological signal, it is not necessary to attach an electrode to the body of the subject before measurement and to remove an electrode attached to the body after measurement. When a biological signal is detected, a large burden is not given to the measurement subject.
[0005]
[Problems to be solved by the invention]
The proposed biological signal detection apparatus mainly uses a measurement bed when detecting a biological signal, and thus has various problems as described below.
[0006]
That is, the first is that since the measurement bed is large, the biological signal detection apparatus becomes large-scale, and it is necessary to separately secure an arrangement location of the biological signal detection apparatus, which increases the cost. End up.
[0007]
Secondly, since it is difficult to move the large measurement bed, it is necessary to go to the place where the measurement bed is placed every time the measurement subject detects a biological signal. It is not possible to easily detect a biological signal.
[0008]
Third, when the measurement subject lies on the measurement bed, detection of the biological signal becomes difficult depending on the position of the measurement subject, and accurate detection of the biological signal cannot always be performed.
[0009]
The present invention solves these problems, and the purpose of the present invention is to reduce the cost of the apparatus without making it large-scale, and it is not necessary to separately secure the installation location of the apparatus. An object of the present invention is to provide a biological signal detection apparatus that can accurately detect and measure biological signals without being aware of detection.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the biological signal detection apparatus of the present invention is a pillow-like object on which the head of a person to be measured is placed, and is a horizontally long cushion part and a seat under the cushion part. A deformable high permeability member, a spacer member provided with a plurality of holes on the lower side of the high permeability member, and a magnetic sensor disposed in at least one hole of the spacer member. Means for detecting, by a magnetic sensor, deformation of the high magnetic permeability member due to a person's fine movement.
[0011]
According to the above means, when the person to be measured lies with the head placed on the cushion part, the fine movement of the person to be measured is transmitted to the high permeability member provided below the cushion part. Since the high-permeability member is slightly deformed, the change in the static magnetic field accompanying the minute deformation is detected by a magnetic sensor disposed close to the high-permeability member below the same cushion part. The fine movement of the measurer can be easily detected in a natural state, and since the biological signal detection device is in a pillow shape, the biological signal detection device can be easily transported to a favorite place. it can.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In an embodiment of the present invention, the biological signal detection device is a pillow-like device that is placed in a static magnetic field and on which the head of the person to be measured can be placed, and the cushion on which the head of the person to be measured is placed Part, a sheet-like deformable high permeability member arranged under the cushion part, and a plurality of holes arranged under the high permeability member to assist the deformation of the high permeability member The spacer member includes a spacer and a magnetic sensor disposed in at least one hole of the spacer member, and detects fine movement of the measurement subject by deformation of the high permeability member.
[0013]
In one embodiment of the present invention, in the biological signal detection device, at least the cushion portion is horizontally long, and the magnetic sensor is disposed along the longitudinal direction of the cushion portion of the plurality of holes of the spacer member. These are respectively disposed in the two holes. Here, the meaning along the longitudinal direction is that the magnetic sensor is arranged on a straight line along the longitudinal direction, and the straight line connecting the two magnetic sensors is parallel to the straight line along the longitudinal direction of the cushion portion. In addition, it includes a form excluding the orthogonal state.
[0014]
In another embodiment of the present invention, the biological signal detection device is arranged so that the high permeability member and the magnetic sensor have a small gap when the head of the person to be measured is not placed on the cushion portion. It is what has been.
[0015]
In still another embodiment of the present invention, in the biological signal detection device, the magnetic sensor is disposed on the lower side of the spacer member, and is supported by a fixed plate made of a nonmagnetic material harder than the spacer member. Is.
[0016]
In another one of the embodiments of the present invention, the biological signal detection apparatus is one in which a high permeability member, a spacer member, and a magnetic sensor are integrally joined.
[0017]
In another one of the embodiments of the present invention, the biological signal detection device is configured such that the fixed plate is integrally joined together with the high permeability member, the spacer member, and the magnetic sensor.
[0018]
In these embodiments of the present invention, when the person to be measured lies with the head placed on the horizontally long cushion part, the fine movement obtained by the breathing and heartbeat of the person to be measured is previously placed on the lower side of the cushion part. The high permeability member is transmitted to the installed high permeability member, and the high permeability member is minutely deformed, and the change of the static magnetic field due to this minute deformation is arranged close to the high permeability member under the same cushion part. It is detected by a magnetic sensor.
[0019]
As described above, according to the embodiments of the present invention, the fine movement (biological body) obtained by the measurement subject's breathing or heartbeat can be obtained only by lying down with the head placed on the horizontally long cushion portion. Signal) can be easily detected without placing a psychological burden on the person being measured, and the device is pillow-shaped and can be easily transported. There is no need for a large-scale device, high manufacturing costs, or a separate location for installing the device, and there is a measurement bed when the person to be measured detects a biological signal. There is no need to go to a place, and detection of a biological signal is not disabled depending on the position of the person to be measured.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
1 (a) and 1 (b) are configuration diagrams showing an embodiment of a biological signal detection device according to the present invention, wherein the biological signal detection device has a pillow shape, and FIG. (B) is a top view seen through the inside.
[0022]
As shown in FIGS. 1 (a) and 1 (b), the biological signal detection device of the present embodiment is entirely made of a pillow-like material, and includes a cushion part 1 and a sheet-like high-permeability member. 2, the spacer member 3, and three holes 3 provided in the spacer member 3 ₁ 3 ₂ 3 _Three And three wiring through grooves 3 provided in the spacer member 3 _Four 3 _Five 3 ₆ And the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ And the fixing plate 5 and the two wires 6 ₁ , 6 ₂ It is made up of.
[0023]
And the cushion part 1 is a rectangular thing like a normal pillow, and the inside is filled with the buckwheat shell, cotton, etc. which consist of nonmagnetic materials. The sheet-like high magnetic permeability member 2 is a substantially rectangular member made of an amorphous alloy such as an iron-based, iron / nickel-based, or cobalt-based alloy, and is disposed below the cushion portion 1. The spacer member 3 is made of a foamed material made of a nonmagnetic material such as foamed polystyrene or foamed urethane called foamed polystyrene, or an elastic cushion material such as an elastomer material such as silicon rubber, preferably made of foamed polystyrene that is moderately hard, A high-permeability member 2 having a rectangular shape with a thickness of about 2 to 4 cm and slightly smaller than the cushion portion 1, with a side of about 3 to 5 cm, or a square shape or Three circular holes 3 with a diameter of about 3 to 5 cm ₁ 3 ₂ 3 _Three Are opened side by side in the longitudinal direction, and three holes 3 are formed on the lower surface side. ₁ 3 ₂ 3 _Three Three wiring through grooves 3 respectively communicating with each other _Four 3 _Five 3 ₆ Is provided. First magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ 3 holes 3 provided in the cushion part 1 ₁ 3 ₂ 3 _Three Two holes 3 at both ends inside ₁ 3 _Three The first magnetic sensor 4 is mounted on a fixed plate 5 disposed on the lower side of the spacer member 3. ₁ And the second magnetic sensor 4 ₂ The first magnetic sensor 4 has a narrow gap of about 1 to 5 mm, preferably a narrow gap g of about 1 to 2 mm. ₁ And the second magnetic sensor 4 ₂ And the thickness of the spacer member 3 are selected. The fixing plate 5 is made of a non-magnetic material made of aluminum or synthetic resin that is harder than the spacer member 3 and has a rectangular shape that is slightly smaller than the cushion portion 1 and slightly larger than the spacer member 3. 4 ₁ And the second magnetic sensor 4 ₂ A double-sided pressure-sensitive adhesive tape or an adhesive is used for adhesion between the fixing plate 5 and the fixing plate 5. Two wires 6 ₁ , 6 ₂ Is one end of the first magnetic sensor 4 ₁ And the second magnetic sensor 5 ₂ Is connected to the wiring groove 3 of the spacer member 3. _Four 3 ₆ Connected to an external circuit. In this case, the lower surface of the sheet-like high magnetic permeability member 2 and the upper surface of the spacer member 3 are partially joined by an adhesive or the like so that the high magnetic permeability member 2 can be deformed, and the lower surface of the spacer member 3 The upper surface of the fixing plate 5 is similarly joined by an adhesive or the like.
[0024]
In this case, the sheet-like high magnetic permeability member 2 is a high magnetic permeability material having a higher magnetic permeability than that of pure iron, such as an iron-based, iron / nickel-based, cobalt-based alloy having a relative magnetic permeability of about 8000 or more. A material such as permalloy having a nickel content (weight ratio) of 35 to 80% is selected. The amorphous alloy includes a commercially available alloy containing iron, nickel and cobalt as main components and containing a small amount of boron (B), chromium (Cr), molybdenum (Mo), carbon (C) and the like. Such an amorphous alloy has a high magnetic permeability and can be relatively thin when formed into a sheet shape, so that it is easily deformed by an external force. Permalloy, on the other hand, has a higher magnetic permeability than pure iron, but is limited in thinning when formed into a sheet. Therefore, the degree of deformation due to flexibility and external force is slightly inferior to amorphous alloys. However, this is advantageous in terms of cost.
[0025]
Further, the thickness of the high magnetic permeability member 2 needs to be deformed in response to the subject's breathing, heartbeat and other fine movements when the head of the subject is placed on the cushion part 1. Therefore, the thickness may be 0.2 mm or less practically.
[0026]
The first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Have the same characteristics and detect a weak static magnetic field such as the geomagnetism that becomes a static magnetic field. Therefore, a highly sensitive magnetic sensor, for example, a primary coil (toroidal coil) and a secondary coil (toroidal core) A fluxgate type magnetic sensor (hereinafter referred to as FGS) in which an output coil is wound is used. The FGS forms a toroidal core by laminating a plurality of permalloy rings, winds a primary coil (toroidal coil) almost uniformly along the toroidal core, and gives a directivity in the radial direction of the toroidal core. This is a structure in which a coil (output coil) is wound. The operation of FGS increases when the amount of current supplied to the primary coil increases when the geomagnetism passes through the toroidal core until the toroidal core becomes magnetically saturated. One region is magnetically saturated for a moment faster than the other region. At this point, the balance between the upward magnetic flux and the downward magnetic flux in the secondary coil is lost, apparently the magnetic flux passing through the secondary coil changes, and a pulse voltage is output from the secondary coil. Since the magnitude of the pulse voltage depends on the strength of the geomagnetism passing through the toroidal core, the geomagnetism can be detected by detecting the magnitude of the pulse voltage.
[0027]
The first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Are not limited to those using FGS, and for example, a magneto-impedance effect element (MI element) as disclosed in JP-A-7-181239 may be used.
[0028]
Here, FIG. 2 shows a deformation state of the sheet-like high permeability member 2 when the head of the person to be measured is placed on the cushion portion 1 in the biological signal detection apparatus shown in FIG. It is sectional drawing which shows an example.
[0029]
In FIG. 2, the same components as those shown in FIG.
[0030]
As shown in FIG. 2, when the head of the person to be measured is placed on the cushion part 1, the cushion part 1 partially sinks due to the weight of the head of the person to be measured. The sheet-like high magnetic permeability member 2 on the side also partially sinks and deforms. The degree of the subsidence deformation is determined by the three holes 3 of the spacer member 3. ₁ 3 ₂ 3 _Three It is slightly larger in the part where is provided, and smaller in other parts. Therefore, the sheet-like high permeability member 2 and the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ As shown in FIG. 1 (a), the narrow gap provided between the head and the head is slightly narrower than the gap g when the head of the person to be measured is not placed on the cushion portion 1. The gap g ′ (g> g ′) is obtained. At this time, the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Detects a minute displacement of the sheet-like high-permeability member 2 that accompanies the subject's breathing, heartbeat, and other fine movements as a change in the static magnetic field, extracts the detected fine movement in the form of an electric signal, A respiration signal and a heartbeat signal are obtained by processing by a processing circuit as described below.
[0031]
Here, FIG. 3 shows the first magnetic sensor 4 made of FGS. ₁ And the second magnetic sensor 4 ₂ 4 is a block configuration diagram showing an example of a processing circuit that performs analog processing on the fine movement obtained in FIG. 4, and FIG. 4 is a signal waveform diagram schematically showing signal states of respective parts in the processing circuit shown in FIG.
[0032]
As shown in FIG. 3, the processing circuit includes a first magnetic sensor 4 made of FGS. ₁ And the second magnetic sensor 4 made of FGS. ₂ And the first amplifier circuit 7 ₁ And the second amplifier circuit 7 ₂ And the first detection circuit 8 ₁ And the second detection circuit 8 ₂ And the first integrating circuit 9 ₁ And the second integrating circuit 9 ₂ And the first low-pass filter 10 ₁ And the second low-pass filter 10 ₂ A resistor distribution circuit 11, an FGS drive circuit 12, a clock generation circuit 13, and a selection circuit 14, and these components 4 ₁ 10 ₁ 4 ₂ 10 ₂ , 12-14 are interconnected as shown in FIG. In this case, the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Have the same characteristics, and as shown in FIG. 1B, the two holes 3 at both ends of the spacer member 3 ₁ 3 _Three Each is mounted on a fixed plate 5.
[0033]
The processing circuit having the above configuration operates as follows.
[0034]
The clock generation circuit 13 includes a 3.8 KHz square wave drive timing signal as shown in the first stage signal waveform a in FIG. 4 and a 7.6 KHz square as shown in the second stage signal waveform b in FIG. A wave detection timing signal is generated, the drive timing signal is sent to the FGS drive circuit 12, and the detection timing signal is sent to the two detection circuits 8 ₁ , 8 ₂ To supply each. The FGS drive circuit 12 generates a rectangular wave drive signal in response to the supplied drive timing signal. The resistance distribution circuit 11 distributes the rectangular wave drive signal, and the first magnetic sensor 4 ₁ Primary coil (toroidal coil) and second magnetic sensor 4 ₂ To the primary coil (toroidal coil).
[0035]
First magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ The toroidal core reaches a magnetic saturation state in one direction of the magnetic flux from the magnetic non-saturation state by the supplied driving current, and then the other of the magnetic flux passes through the magnetic saturation state to the magnetic non-saturation state by reversing the polarity of the driving current. Direction of magnetic saturation. Thus, the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ The toroidal core sequentially repeats the states of magnetic non-saturation, magnetic saturation in one direction, magnetic non-saturation, magnetic saturation in the other direction, and magnetic non-saturation. ₁ And the second magnetic sensor 4 ₂ The inter-terminal voltage of the primary coil (toroidal coil) shows a large value from when the current polarity is reversed until the toroidal core is magnetically saturated, as shown in the signal waveform c in the third stage of FIG. A small value is shown at the moment when the toroidal core is magnetically saturated.
[0036]
First magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Is affected by the geomagnetism existing in the ground space. At this time, as described above, there is a slight difference between the time from magnetic unsaturation to magnetic saturation and the time from magnetic saturation to magnetic unsaturation between the one region and the other region of the toroidal core. Magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ In each of the secondary coils (output coils), the balance between the increase or decrease of the magnetic flux in one axial direction (for example, upward in FIG. 3) and the magnetic flux in the other direction (for example, downward in FIG. 3). The magnetic flux passing through the secondary coil (output coil) changes and the pulse voltage as shown in the signal waveform d in the fourth stage in FIG. 4 is output from the secondary coil (output coil). . In other words, a pulse voltage is generated at the moment when the polarity of the drive current is reversed (shift from core saturation to non-saturation) and at the moment when the drive current continues to be applied in the same direction, thereby shifting from saturation to saturation.
[0037]
First amplifier circuit 7 ₁ Is the first magnetic sensor 4 ₁ Output pulse voltage from the secondary coil (output coil) of the second amplification circuit 7 ₂ Is the second magnetic sensor 4 ₂ The output pulse voltage from the secondary coil (output coil) is amplified.
[0038]
First detection circuit 8 ₁ Is an analog buffer that functions as a gain 1 inverting amplifier or gain 1 non-inverting amplifier, and the polarity of the amplified pulse voltage is inverted or not corresponding to the binary polarity (high, low) of the supplied detection timing signal. The inversion is controlled and converted into a pulse voltage of one polarity as shown in the signal waveform e at the fifth stage in FIG. The second detection circuit 8 ₂ The first detection circuit 8 ₁ The amplified pulse voltage is converted into a single polarity pulse voltage.
[0039]
First integrating circuit 9 ₁ The first detection circuit 8 ₁ 1 is integrated to remove the drive timing signal and detection timing signal components contained in the one polarity pulse voltage. The second integrating circuit 9 ₂ The first integrating circuit 9 ₁ The drive timing signal and the detection timing signal component included in the pulse voltage of one polarity are removed.
[0040]
First low-pass filter 10 ₁ Has a cutoff frequency of about 20 Hz and the first integrating circuit 9 ₁ The commercial power supply frequency component contained in the output is removed. Incidentally, since the heart rate of the person to be measured is about 1 to 2 Hz, the first low-pass filter 10 ₁ The first low-pass filter 10 is not removed by ₁ As shown in the signal waveform f at the sixth stage in FIG. 4, a signal including the respiration and heartbeat of the subject is obtained. The second low-pass filter 10 ₂ The first low-pass filter 10 ₁ And the same function as the second low-pass filter 10. ₂ In the output, a signal including the respiration and heartbeat of the measurement subject as shown in the signal waveform f in the sixth stage of FIG. 4 is obtained. The signal waveform f is shown with a reduced time axis (horizontal axis) than the other signal waveforms a to e.
[0041]
The selection circuit 14 includes the first low-pass filter 10 ₁ Output signal and the second low-pass filter 10 ₂ A good signal is selected from the output signals, and the obtained signal is used as a biological signal.
[0042]
Next, FIGS. 5 (a), (b), and (c) are characteristic diagrams showing an example of a specific waveform of the biological signal detected by the biological signal detection apparatus of the present embodiment, where (a) is a selection. A total signal waveform including respiration and heartbeat output from the circuit 14, (b) a respiration signal waveform obtained by extracting a respiration signal from the total signal waveform, and (c) a heartbeat signal waveform obtained by extracting a heartbeat signal from the total signal waveform. is there.
[0043]
In this case, the total signal waveform output from the selection circuit 14 is obtained by superimposing the respiratory signal and the heartbeat signal as shown in FIG.
[0044]
Further, by adding the total signal waveform to the low-pass filter and removing the heartbeat signal, it is possible to extract only the respiration signal as shown in FIG.
[0045]
Furthermore, by adding the total signal waveform to the high-pass filter and removing the respiratory signal, only the heartbeat signal as shown in FIG.
[0046]
As described above, according to the biological signal detection apparatus of the present embodiment, the person to be measured lies down and only the head is placed on the cushion part 1, so that the minute movement (biological signal) based on the person's breathing, heartbeat, etc. Can be detected in a natural state without being strained by the person being measured, and since the device is a pillow-like device, the device becomes large-scale and the manufacturing cost increases. There is no need to secure a separate place for installing the device, and it is no longer necessary to go to the place where the measurement bed is located when the measurement subject detects a biological signal, The detection of vital signs is not disabled by the position of the person being measured, and it is not necessary to attach electrodes to the body of the person to be measured. Can Nor to apply the psychological burden on the person to be measured at the time of detection of the body signal. The first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ Since the fixed plate 5 is supported by the rigid fixed plate 5 and the fixed plate 5 is not easily deformed even when the head is placed on the cushion portion 1, the change in the magnetic field due to the deformation of the high permeability member 2 is accurate. Can be detected well.
[0047]
In the above embodiment, the spacer member 3 has three holes 3. ₁ Thru 3 _Three With two holes 3 at both ends in it ₁ 3 _Three Inside the first magnetic sensor 4 ₁ And the second magnetic sensor 4 ₂ However, the configuration of the spacer member 3 and the arrangement state of each magnetic sensor in the present invention are not limited to such an example, and in order to make the high permeability member 2 more flexible. The spacer member 3 may be provided with four or more holes, or may be provided with two or one hole. Further, three or more magnetic sensors may be provided. It may be arranged.
[0048]
For example, as shown in FIG. 6, the spacer member 3 has three rows of two holes, three holes, and two holes 3 in total. ₁ Thru 3 _Three 3 ₇ Thru 3 _Ten And provide those holes 3 ₁ Thru 3 _Three 3 ₇ Thru 3 _Ten 3 holes 3 in the middle row of ₁ Thru 3 _Three 1st magnetic sensor 4 respectively ₁ The third magnetic sensor 4 _Three Second magnetic sensor 4 ₂ Each magnetic sensor 4 ₁ 4 ₂ 4 _Three From 6 each ₁ , 6 ₂ , 6 _Three May be derived. In addition, each magnetic sensor 4 ₁ 4 ₂ 4 _Three Are not necessarily arranged in a line. For example, the holes 3 are spaced apart in both the longitudinal direction and the short direction of the cushion portion 1. ₈ 3 ₉ Magnetic sensors may be arranged only at the two locations.
[0049]
In addition, in the said Example, although the sheet-like high magnetic permeability member 2, the spacer member 3, and the fixing plate 5 were joined and demonstrated, the example which integrated these substantially was demonstrated, but in this invention These integrated structures are not limited to the above-described example, and the sheet-like high magnetic permeability member 2, the spacer member 3, and the fixing plate 5 are accommodated in the bag-like portion and substantially integrated. Good.
[0050]
Further, although not shown, the first embodiment includes the integrated high permeability member 2, the spacer member 3, the magnetic sensor, and the cushion portion 1 placed on the fixed plate 5. It is stored in a bag-like item such as a pillow cover.
[0051]
【The invention's effect】
As described above, according to the present invention, microtremors (biological signals) obtained by breathing or heartbeat of a subject can be measured only by the subject to lie with the head placed on a horizontally long cushion portion. It can be easily detected without placing a psychological burden on the measurer, and the device is made of a pillow and can be easily transported, resulting in a large-scale device. There is no need to increase the manufacturing cost, or to separately secure a place for installing the device, and when the person to be measured detects a biological signal, he / she goes to the place where the measurement bed is located. Thus, there is an effect that the detection of the biological signal is not disabled by the position where the person to be measured lies.
[0052]
In addition, since the magnetic sensor is disposed in the two holes that are spaced apart in the longitudinal direction of the cushion portion, a biological signal can be detected regardless of the position of the head.
[0053]
Furthermore, since a gap is provided between the high permeability member and the magnetic sensor, the high permeability member can be greatly deformed, the change in the magnetic field due to the fine movement of the measurement subject increases, and a large biological signal is generated. can get.
[0054]
In addition, since the magnetic sensor is supported by a hard fixed plate, the magnetic sensor can be firmly supported, the change in the magnetic field due to the deformation of the high permeability member can be detected more accurately, and the biological signal is measured. Accuracy is increased.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a biological signal detection apparatus according to the present invention.
2 is a cross-sectional view showing an example of a deformed state of a sheet-like high permeability member when the head of a person to be measured is placed on a cushion portion in the embodiment shown in FIG.
FIG. 3 is a block configuration diagram illustrating an example of a processing circuit that performs analog processing on fine movement obtained by a first magnetic sensor and a second magnetic sensor.
4 is a signal waveform diagram schematically showing signal states of respective parts in the processing circuit shown in FIG. 3. FIG.
FIG. 5 is a characteristic diagram showing an example of a specific waveform of a biological signal detected by the biological signal detection apparatus of the present embodiment.
FIG. 6 is a configuration diagram showing another example of the arrangement state of the holes of the spacer member and the arrangement state of the magnetic sensor.
[Explanation of symbols]
1 Cushion part
2 Sheet-like high permeability member
3 Spacer member
3 ₁ 3 ₂ 3 _Three 3 ₇ 3 ₈ 3 ₉ 3 _Ten Hole
3 _Four 3 _Five 3 ₆ Wiring through groove
4 ₁ 1st magnetic sensor
4 ₂ Second magnetic sensor
4 _Three Third magnetic sensor
5 fixed plate
6 ₁ , 6 ₂ , 6 _Three wiring
7 ₁ First amplifier circuit
7 ₂ Second amplifier circuit
8 ₁ First detection circuit
8 ₂ Second detector circuit
9 ₁ First integration circuit
9 ₂ Second integration circuit
10 ₁ First low-pass filter
10 ₂ Second low-pass filter
11 Resistance distribution circuit
12 FGS drive circuit
13 Clock generation circuit
14 Selection circuit

Claims (6)

A pillow that is placed in a static magnetic field and on which the head of the person to be measured can be placed. The cushion part on which the head of the person to be measured is placed, and the cushion part. A sheet-like deformable high magnetic permeability member, a spacer member disposed below the high magnetic permeability member and provided with a plurality of holes for assisting deformation of the high magnetic permeability member; and at least one of the spacer members A biological signal detection apparatus comprising: a magnetic sensor disposed in one hole and detecting fine movement of the measurement subject by deformation of the high permeability member. The cushion portion is horizontally long, and the magnetic sensor is disposed in at least two holes spaced apart in the longitudinal direction of the cushion portion of the plurality of holes of the spacer member. The biological signal detection device according to claim 1. The said high-permeability member and the said magnetic sensor are arrange | positioned through the small gap when the to-be-measured person's head is not mounted in the said cushion part, The Claim 1 or 2 characterized by the above-mentioned. Biological signal detection device. The biological signal detection device according to claim 1, wherein the magnetic sensor is disposed on a lower side of the spacer member and supported by a fixing plate made of a nonmagnetic material harder than the spacer member. . The biological signal detection device according to claim 1, wherein the high permeability member, the spacer member, and the magnetic sensor are integrally joined. The biological signal detection device according to claim 4, wherein the fixing plate is integrally joined together with the high permeability member, the spacer member, and the magnetic sensor.

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