JP7698279B2 - Brainwave measuring device - Google Patents

Description

The present invention relates to an electroencephalogram measuring device.

Conventionally, overnight polysomnography (PSG) has been known as a method for scientifically measuring human sleep. In PSG, sleep stages and breathing and circulation information during sleep are determined (a sleep progression diagram is created) based on measurement data from more than 20 electrodes and sensors, including parameters such as breathing and circulation.

The inventors of the present invention have conducted intensive research to discover new technology for scientifically measuring human sleep. As a result, they have obtained the following findings. Note that the findings below are merely the impetus for the invention, and do not limit the invention.

In other words, PSG requires the subject to be fitted with 20 or more electrodes and sensors, and the fitting process alone can take up to an hour. In addition, because the subject is admitted to hospital for the test under supervision, which is different from their everyday state, the burden on the subject is large, and this can affect the results of the assessment. In addition, because sleep stages and each parameter during sleep are assessed (a sleep progression chart is created) based on measurement data from 20 or more electrodes and sensors, analysis takes time.

The present invention has been made in consideration of the above points. The object of the present invention is to provide a technology that can solve at least one of the above problems that PSG has.

The electroencephalogram measuring device according to the first aspect of the present invention comprises:
an electrode unit; and a device body unit that acquires an electrical signal from the electrode unit;
The electrode portion is
a sheet-like horizontally elongated portion on which at least two forehead electrodes are provided side by side;
a vertically elongated portion extending vertically from the horizontally elongated portion and having a connection portion at a tip end for connection to the device main body;
a left arm portion and a right arm portion which are branched to the left and right from the vertically long portion, and then bent and extend in the vertical direction, and have a left ear electrode and a right ear electrode provided at their tips, respectively;
has.

According to this embodiment, the electrode unit has a very simple and unique shape, which includes a horizontal portion on which the forehead electrode is provided, a vertical portion extending vertically from the horizontal portion, and a left arm portion and a right arm portion branching out from the vertical portion and having a left ear electrode and a right ear electrode at their tips. Therefore, the electrode unit can be easily worn by a single subject in a short time, and can be used at low cost. The shape is also designed to be comfortable to wear and not disturb sleep. This allows the subject to use the device at home with ease, and enables sleep to be determined in everyday conditions. At least two forehead electrodes are provided integrally with the sheet-like horizontal portion, and their relative positions are fixed, so that the electrodes can be arranged in the same positional relationship each time simply by attaching the sheet-like horizontal portion to the forehead. The forehead electrode can be attached to the forehead of the subject to detect eye movements in addition to brain waves. The left ear electrode and the right ear electrode can be attached behind the left and right ears of the subject to detect myoelectricity of the neck in addition to brain waves. Therefore, in addition to brain waves, eye movement and neck electromyographic signals can be used, improving the accuracy of sleep determination.

The electroencephalogram measuring device according to a second aspect of the present invention is the electroencephalogram measuring device according to the first aspect,
The horizontally elongated portion is further provided with a reference electrode.

The electroencephalogram measuring device according to a third aspect of the present invention is the electroencephalogram measuring device according to the second aspect,
The reference electrode is provided between the left and right forehead electrodes.

According to this aspect, at least two forehead electrodes and a reference electrode are integrally provided on the sheet-like horizontal portion, and their relative positions are fixed. Therefore, by simply attaching the sheet-like horizontal portion to the forehead, it is possible to position each electrode in the same positional relationship each time, and it is possible to suppress variation in the assessment results due to changes in the relative positions of each electrode.

The electroencephalogram measuring device according to a fourth aspect of the present invention is the electroencephalogram measuring device according to any one of the first to third aspects,
The length between the base end of the left arm and the right arm and the horizontally elongated portion is 5 to 10 cm.

As a result of extensive research by the inventors, this embodiment can reduce ear pain felt by the subject and more effectively prevent sleep disturbance.

An electroencephalogram measuring device according to a fifth aspect of the present invention is the electroencephalogram measuring device according to the fourth aspect,
The length between the base end of the left arm and the right arm and the horizontally elongated portion is 6 to 9 cm.

As a result of extensive research by the inventors, this embodiment can further reduce ear pain felt by the subject and more effectively prevent sleep disturbance.

A sixth aspect of the present invention relates to an electroencephalogram measuring device, comprising:
The length between the base end portions of the left arm and right arm and the horizontally long portion is shorter than the length between the base end portions of the left arm and right arm and the connecting portion.

A seventh aspect of the present invention relates to an electroencephalogram measuring device, comprising:
It has a symmetrical shape.

The electrode portion according to the eighth aspect of the present invention comprises:
An electrode unit that is detachable from a device main body of an electroencephalogram measuring device,
a sheet-like horizontally elongated portion on which forehead electrodes are provided side by side;
a vertically elongated portion extending vertically from the horizontally elongated portion and having a connection portion at a tip end for connection to the device main body;
a left arm portion and a right arm portion which branch out in opposite directions from the vertically long portion, and then extend in a bent or curved manner in the vertical direction, and have a left ear electrode and a right ear electrode provided at their tips, respectively;
has.

According to this embodiment, the electrode unit has a very simple and unique shape, which includes a horizontal portion on which the forehead electrode is provided, a vertical portion extending vertically from the horizontal portion, and a left arm portion and a right arm portion branching out from the vertical portion and having a left ear electrode and a right ear electrode at their tips. Therefore, the electrode unit can be easily worn by a single subject in a short time, and can be used at low cost. The shape is also designed to be comfortable to wear and not disturb sleep. This allows the subject to use the device at home with ease, and enables sleep to be determined in everyday conditions. At least two forehead electrodes are provided on the sheet-like horizontal portion, and the relative positions of the electrodes are fixed, so that the electrodes can be accurately positioned at the same position every time by simply attaching the sheet-like horizontal portion to the forehead. The forehead electrode can be attached to the forehead of the subject to detect eye movements in addition to brain waves. The left ear electrode and the right ear electrode can be attached behind the left and right ears of the subject to detect myoelectricity of the neck in addition to brain waves. Therefore, in addition to brain waves, eye movement and neck electromyographic signals can be used, improving the accuracy of sleep determination.

FIG. 1 is a diagram showing a schematic configuration of an electroencephalogram measuring device according to one embodiment. FIG. 2 is a plan view showing a schematic configuration of an electrode portion according to an embodiment. FIG. 3 is a cross-sectional view of the electrode portion according to the embodiment taken along line AA. FIG. 4 is a cross-sectional view of the electrode portion according to the embodiment taken along line BB. FIG. 5 is a front view showing a state in which the electrode unit according to the embodiment is attached to the head of a subject. FIG. 6 is a right side view (as seen from the left side from the subject's perspective) showing a state in which the electrode section according to one embodiment is attached to the subject's head. FIG. 7 is a left side view (as seen from the right side from the subject's perspective) showing a state in which an electrode section according to one embodiment is attached to the subject's head. FIG. 8 is a perspective view of an electrode unit according to one embodiment attached to the head of a subject, as viewed obliquely from the front. FIG. 9 is a perspective view of an electrode unit according to an embodiment attached to a subject's head, as viewed obliquely from behind. FIG. 10 is a block diagram showing a schematic configuration of a device main body according to one embodiment. FIG. 11 is a plan view showing a schematic configuration of an electrode portion according to a first modified example. FIG. 12 is a plan view showing a schematic configuration of an electrode portion according to a second modified example.

Below, an embodiment of the present invention will be described in detail with reference to the attached drawings. Note that in each drawing, components having equivalent functions are given the same reference numerals, and detailed descriptions of components with the same reference numerals will not be repeated.

Figure 1 is a diagram showing the general configuration of an electroencephalogram measuring device 1 according to one embodiment.

As shown in FIG. 1, the EEG measuring device 1 includes an electrode unit 10 and a device main body unit 20 that acquires electrical signals from the electrode unit 10.

This EEG measuring device 1 is, for example, loaned to a subject (user) for a certain period of time (e.g., one week) by an EEG analysis service provider, and the subject is asked to return the device after measuring the EEG over several nights and storing the data in the device main body 20. The service provider then uploads all of the data stored in the device main body 20 to an external EEG analysis system (e.g., on the cloud) to perform sleep analysis. The device main body 20 may be charged by a charger (not shown) and run on a built-in battery 26 (see FIG. 10).

As shown in FIG. 1, the electrode unit 10 may be detachable from the device main body 20. As shown in FIGS. 5 to 9, the electrode unit 10 is a part that is worn on the subject's head when in use, and is prone to becoming dirty or scratched during use. However, by being configured to be detachable from the device main body 20, even if the electrode unit 10 becomes dirty or scratched, it is possible to easily replace just the electrode unit 10.

The electrode unit 10 may be disposable after a predetermined period (for example, one week) or number of uses. In this case, it is possible to lower the level of mechanical durability required of the electrode unit 10 compared to a non-disposable type (for example, a type designed on the premise of repeated use by cleaning or replacing only consumable parts), and it is possible to provide it at a lower cost. In addition, by being disposable and being able to perform measurements continuously for multiple days, troublesome maintenance work is not necessary, and the subject can easily use it at home.

Figure 2 is a diagram showing the schematic configuration of the electrode unit 10. Figure 5 is a front view showing the electrode unit 10 attached to the subject's head. Figure 6 is a right side view (viewed from the left side from the subject's perspective) showing the electrode unit 10 attached to the subject's head. Figure 7 is a left side view (viewed from the right side from the subject's perspective) showing the electrode unit 10 attached to the subject's head. Figure 8 is a perspective view of the electrode unit 10 attached to the subject's head, viewed from diagonally forward. Figure 9 is a perspective view of the electrode unit 10 attached to the subject's head, viewed from diagonally rear.

As shown in FIG. 2, the electrode unit 10 has a sheet-like horizontal portion 11, a vertical portion 12 extending vertically from the horizontal portion 11, and a left arm portion 13 and a right arm portion 14 that branch off to the left and right from the vertical portion 12 and then bend and extend vertically. The electrode unit 10 may have a symmetrical shape.

At least two forehead electrodes 31, 32 are provided side by side on the horizontal portion 11. The distance between the left and right forehead electrodes 31, 32 is set to a length that allows the forehead electrodes 31, 32 to be attached at the positions of the frontal poles Fp1 and Fp2 in the 10/20 method. A reference electrode 35 may also be provided on the horizontal portion 11. As shown in FIG. 2, the reference electrode 35 may be provided between the left and right forehead electrodes 31, 32. The forehead electrodes 31, 32 and the reference electrode 35 may be removably attached to a mount 41 to prevent the conductive gel from drying out.

At least two forehead electrodes 31, 32 and a reference electrode 35 are integrally provided on the sheet-like horizontal portion 11, and their relative positions are fixed. As shown in Figures 5 to 9, by simply attaching the sheet-like horizontal portion 11 to the subject's forehead, it is possible to position each electrode 31, 32, 35 in the same positional relationship each time, and it is possible to suppress variation in the assessment results caused by changes in the relative positions of the electrodes 31, 32, 35.

Figure 3 shows an example of a cross section of the horizontally elongated portion 11 of the electrode portion 10 taken along line A-A in Figure 2.

As shown in FIG. 3, the horizontally elongated portion 11 may have a sheet-like electrode holding material 51, an insulating base material 54 laminated on the electrode holding material 51 via an adhesive 51a, electrodes and signal conductors 55 laminated on the insulating base material 54, and a conductive gel 56 laminated on the electrodes 55. A backing 41 is detachably attached to the conductive gel 56.

The electrode holding material 51 may be, for example, a nonwoven fabric or a foamed resin. In this case, the comfort of the lateral portion 11 is improved, and sleep disturbance can be prevented.

As shown in FIG. 2, the left and right ends of the horizontal portion 11 may be provided with protrusions 11a and 11b for the subject to pinch with his or her fingers when peeling the forehead electrodes 31, 32 and the reference electrode 35 from the mount 41 (or the subject's forehead). This makes it easier to peel the forehead electrodes 31, 32 and the reference electrode 35 from the mount 41 (or the subject's forehead).

As shown in FIG. 2, a left ear electrode 33 is provided at the tip of the left arm 13, and a right ear electrode 34 is provided at the tip of the right arm 14. The lengths of the left arm 13 and right arm 14 are set so that the left ear electrode 33 and right ear electrode 34 can be attached to the earlobes A1 and A2 (behind the ears in the examples shown in FIG. 6 and FIG. 7) in the 10/20 method. The left ear electrode 33 and right ear electrode 34 may be removably attached to a mount 42 to prevent the conductive gel from drying out.

As shown in FIG. 2, the tips of the left arm 13 and the right arm 14 may be provided with display units 13a and 14a that indicate whether the electrodes are for the left or right ear. In the illustrated example, the display units 13a and 14a are the characters "Left" and "Right", but as long as it is possible to distinguish between the left and right ears, the display units are not limited to characters and may be symbols, or may be colors or shapes. Providing the display units 13a and 14a at the tips of the left arm 13 and the right arm 14 can prevent the subject from erroneously attaching the left ear electrode 33 and the right ear electrode 34 in the wrong direction, thereby improving the accuracy of the determination.

As shown in FIG. 2, the display units 13a, 14a of the left arm 13 and the right arm 14 may be provided at an angle inclined in the opposite directions (outward) with respect to the vertical direction (i.e., the direction in which the arms 13, 14 extend). In this case, as shown in FIG. 6, FIG. 7, and FIG. 9, when the left ear electrode 33 and the right ear electrode 34 are attached behind the ears with the display units 13a, 14a of the left arm 13 and the right arm 14 oriented so that they are straight, the left arm 13 and the right arm 14 extend at an angle behind the head (rather than extending straight upward), so that the left arm 13 and the right arm 14 do not hit the back of the ear, which effectively prevents disturbance of sleep.

As shown in FIG. 2, the tips of the left arm 13 and the right arm 14 may be provided with protrusions 13b, 14b, respectively, for the subject to pinch with his/her fingers when peeling the left ear electrode 33 or the right ear electrode 34 from the backing 42 (or the area behind the subject's ears). This makes it easier to peel the left ear electrode 33 or the right ear electrode 34 from the backing 42 (or the area behind the subject's ears).

As shown in FIG. 2, the protrusions 13b, 14b of the left arm 13 and the right arm 14 may be provided at an angle inclined in the opposite direction (inward) to the vertical direction (the direction in which the arms 13, 14 extend). In this case, as shown in FIG. 6, FIG. 7, and FIG. 9, when the left ear electrode 33 and the right ear electrode 34 are attached behind the ears with the protrusions 13b, 14b of the left arm 13 and the right arm 14 oriented so that they are straight, the left arm 13 and the right arm 14 extend at an angle behind the head (rather than extending straight upward), so that the left arm 13 and the right arm 14 do not hit the back of the ears, which effectively prevents disturbance of sleep.

As shown in FIG. 2, the vertically elongated portion 12 includes signal lines extending from each of the electrodes 31 to 35, and a connection portion 12a for connecting to the device main body portion 20 is provided at the tip of the vertically elongated portion 12. The connection portion 12a includes output terminals (not shown) for the signal lines extending from each of the electrodes 31 to 35.

Figure 4 shows an example of a cross section of the vertically long portion 12, left arm portion 13, and right arm portion 14 of the electrode portion 10 taken along line B-B in Figure 2. The layered structure of the left arm portion 13 and right arm portion 14 is similar to the layered structure of the vertically long portion 12, and the layered structure of the vertically long portion 12 will be described below as a representative example.

As shown in FIG. 4, the vertically elongated portion 12 may have a sheet-like first reinforcing material 611, a first insulating substrate 631 laminated on the first reinforcing material 611, a signal conductor 64 (i.e., a signal line extending from each electrode 31 to 35) laminated on the first insulating substrate 631, a second insulating substrate 632 laminated on the signal conductor 64, and a sheet-like second reinforcing material 612 laminated on the second insulating substrate 632.

The first reinforcing material 611 and the second reinforcing material 612 may be, for example, a nonwoven fabric or a foamed resin. In this case, the vertically elongated portion is lightweight and comfortable to the touch, preventing sleep disturbance.

As shown in FIG. 2, the backing 42 on which the left ear electrode 33 and the right ear electrode 34 are attached may have a slit 42a formed therein for inserting the tip of the vertically elongated portion 12 for temporary fixation. In this case, when the device is not in use, the tip of the vertically elongated portion 12 can be inserted into the slit 42a for temporary fixation, making it easy to store the device.

As shown in FIG. 2, cut lines are drawn between the portion of the backing 42 where the left ear electrode 33 is attached, the portion where the right ear electrode 34 is attached, and the portion where the slit 42a is formed, and the portions may be separated from each other at the cut lines.

Referring to FIG. 2, the lengths L1 and L2 from the base ends of the left arm 13 and right arm 14 to the bent portions may be shorter than the length L3 between the base ends of the left arm 13 and right arm 14 and the horizontally elongated portion 11 (i.e., L1<L3 and L2<L3). As a result of extensive research by the present inventors, such a length relationship can reduce the subject's concern (awareness) of the electrode unit 10 attached to the head, and can prevent disturbance to sleep.

The inventors of the present invention have conducted extensive research and found that, in order to reduce the pain felt by the subject in the ears, the length L3 between the base end of the left arm 13 and right arm 14 and the horizontally elongated portion 11 may preferably be 5 to 10 cm, and more preferably be 6 to 9 cm.

As shown in FIG. 2, the length L3 between the base end of the left arm 13 and the right arm 14 and the horizontally long portion 11 may be shorter than the length between the base end of the left arm 13 and the right arm 14 and the connecting portion 12a. Also, as shown in FIG. 2, the length from the bent portion to the tip of the left arm 13 and the right arm 14 may be the same as the length between the base end of the left arm 13 and the right arm 14 and the connecting portion 12a.

Next, the configuration of the device main body 20 will be described with reference to Figures 1 and 10. Figure 10 is a block diagram showing the general configuration of the device main body 20.

As shown in Figures 1 and 10, the device main body 20 has a control unit 21, the connector unit 22 described above, an operation unit 23, a display unit 24, a memory unit 25, and a battery 26.

Of these, the display unit 24 is an interface that displays various information from the device main body 20 to the user, and is, for example, an indicator lamp such as an LED. In the example shown in FIG. 1, the display unit 24 has five indicator lamps 241-245 corresponding to the five electrodes 31-35, respectively. As shown in FIG. 1, in order to allow the user to intuitively grasp the correspondence between the five indicator lamps 241-245 and the five electrodes 31-35, the first indicator lamp 241 corresponding to the left forehead electrode 31, the fifth indicator lamp 245 corresponding to the reference electrode 35, and the second indicator lamp 242 corresponding to the right forehead electrode 32 may be arranged in a row from side to side, and the third indicator lamp 243 corresponding to the left ear electrode 33 may be arranged below the first indicator lamp 241 corresponding to the left forehead electrode 31, and the fourth indicator lamp 244 corresponding to the right ear electrode 34 may be arranged below the second indicator lamp 242 corresponding to the right forehead electrode 32. Also, as shown in FIG. 1, the first indicator lamp 241, the fifth indicator lamp 245, and the second indicator lamp 242 may be surrounded by a figure (contour) having a shape similar to the planar shape of the horizontally elongated portion 11, and the third indicator lamp 243 and the fourth indicator lamp 244 may be surrounded by a figure (contour) having a shape similar to the planar shape of the tip of the left arm portion 13 and the right arm portion 14, respectively. In this case, the correspondence between the five indicator lamps 241 to 245 and the five electrodes 31 to 35 can be more intuitively understood. Each indicator lamp 241 to 245 may be configured to display the quality of the contact state between the corresponding electrode 31 to 35 and the subject's skin, for example, in a different color (blue for good contact, yellow for poor contact, etc.).

The operation unit 23 is an interface for the user to operate the device main body 20, and is, for example, a push button. When the user presses the operation unit 23 (push button), the indicator lamps 241 to 245 are turned off and EEG measurement in the device main body 20 may be started. The operation unit 23 may be recessed to prevent it from being pressed inadvertently when not required.

The memory unit 25 is a non-volatile data storage such as a flash memory. The memory unit 25 stores various data handled by the control unit 21.

The control unit 21 is a control means that performs various processes of the device main body unit 20. The control unit 21 may be realized by a processor in the device main body unit 20 executing a predetermined program, or may be implemented in hardware.

For example, the control unit 21 may acquire 4-channel (i.e., left and right forehead electrodes 31, 32, left ear electrode 33, and right ear electrode 34) EEG signals based on the reference electrode 35 by A/D conversion using an analog front end, and then perform filtering and thinning processing. The control unit 21 may then write the data converted to EDF (European Data Format) format to the memory unit 25. The control unit 21 may be capable of continuous measurement for up to 12 hours in one measurement.

The control unit 21 may also monitor the contact state between the electrodes 31-35 and the subject's skin at the same time as the EEG measurement. For example, the control unit 21 may measure the contact impedance of each of the five electrodes 31-35. The control unit 21 may determine whether the contact state is good or bad based on the measured contact impedance, and may display the good or bad of the contact state on the display unit 24 (indicator lamps 241-245), for example, in different colors. For example, if the control unit 21 determines that the contact state of the left forehead electrode 31 is poor based on the contact impedance of the left forehead electrode 31, the control unit 21 may change the display of the first indicator lamp 241 from blue to yellow to intuitively inform the user that the contact state of the left forehead electrode 31 is poor (error), and encourage the user to attach the error electrode 31 firmly so that the indicator lamp 241 turns blue.

According to the present embodiment described above, the electrode unit 10 has a horizontal section 11 on which the forehead electrodes 31, 32 are provided, a vertical section 12 extending vertically from the horizontal section 11, and a left arm section 13 and a right arm section 14 which branch out and extend to the left and right from the vertical section 12 and have a left ear electrode 33 and a right ear electrode 34 at their tips. This is a very simple and unique shape, so that the subject can easily wear it in a short time by himself and can be used at low cost. In addition, the shape is designed to be comfortable to wear and not disturb sleep. This allows the subject to use it easily at home and makes it possible to judge sleep in everyday conditions.

In addition, according to this embodiment, at least two forehead electrodes 31, 32 are integrally provided on the sheet-like horizontal portion 11, and their relative positions are fixed, so that by simply attaching the sheet-like horizontal portion 11 to the subject's forehead, it is possible to arrange each electrode 31, 32 in the same positional relationship every time. Furthermore, by attaching the forehead electrodes 31, 32 to the subject's forehead, it is possible to detect eye movements in addition to brain waves. Furthermore, by attaching the left ear electrode 33 and the right ear electrode 34 behind the left and right ears of the subject, it is possible to detect neck myoelectricity in addition to brain waves. Therefore, since eye movements and neck myoelectricity signals can be used in addition to brain waves, it is possible to improve the accuracy of sleep determination.

In the above-described embodiment, the left arm 13 and the right arm 14 of the electrode unit 10 branch off to the left and right from the vertically long portion 12 and then extend vertically while bending, but this is not limited to the above. For example, as shown in FIG. 11, the left arm 13 and the right arm 14 may branch off diagonally upward to the left and right from the vertically long portion 12 and then extend vertically while bending. Alternatively, as shown in FIG. 12, the left arm 13 and the right arm 14 may branch off to the left and right from the vertically long portion 12 and then extend vertically while bending (curving).

In the above-described embodiment, the EEG measuring device 1 is lent to the subject (user) by the EEG analysis service provider for a certain period (for example, one week), and the subject (user) is asked to return the device after measuring the EEG over several nights and storing it in the device main body 20. The service provider then uploads all the data stored in the device main body 20 to an external EEG analysis system (for example, on the cloud) to perform sleep analysis. However, this is not limited to this, and for example, the device main body 20 may have a communication unit such as an LTE module, and when the nightly measurement is completed, the data may be automatically uploaded to an external EEG analysis system (for example, on the cloud) via a network such as an LTE line, and sleep analysis may be performed. This significantly reduces the time lag until the EEG analysis results are returned to the subject.

The above description of the embodiment and the disclosure of the drawings are merely examples for explaining the invention described in the claims, and the above description of the embodiment or the disclosure of the drawings do not limit the invention described in the claims. The components of the above embodiment can be combined in any manner without departing from the spirit of the invention.

1 Electroencephalogram measuring device 10 Electrode section 11 Horizontally elongated section 11a, 11b Protrusion section 12 Vertically elongated section 12a Connection section 13 Left arm section 14 Right arm section 13a, 14a Display section 13b, 14b Protrusion section 20 Device main body section 21 Control section 22 Connector section 23 Operation section 24 Display section 241 to 245 Indicator lamp 25 Memory section 26 Battery 31, 32 Forehead electrode 33 Left ear electrode 34 Right ear electrode 35 Reference electrode 41, 42 Mounting paper 42a Slit 51 Electrode holding material 51a Adhesive 54 Insulating substrate 55 Electrode and signal conductor 56 Conductive gel 611 First reinforcing material 612 Second reinforcing material 631 First insulating substrate 632 Second insulating substrate 64 Signal conductor

Claims (7)

an electrode unit; and a device body unit that acquires an electrical signal from the electrode unit;
The electrode portion is
a sheet-like horizontally elongated portion on which at least two forehead electrodes are provided side by side;
a vertically elongated portion extending vertically from the horizontally elongated portion and having a connection portion at a tip end for connection to the device main body;
a left arm portion and a right arm portion which are branched to the left and right from the vertically long portion, and then extend in a bent or curved manner in the vertical direction, and have a left ear electrode and a right ear electrode provided at their tips, respectively;
having
The length between the base end of the left arm and the right arm and the horizontally long portion is 5 to 10 cm.
Brain wave measuring device. A reference electrode is further provided on the horizontally elongated portion.
The electroencephalogram measuring device according to claim 1 . The reference electrode is provided between the left and right forehead electrodes.
The electroencephalogram measuring device according to claim 2 . The length between the base end of the left arm and the right arm and the horizontal portion is 6 to 9 cm.
The electroencephalogram measuring device according to any one of claims 1 to 3 . A length between the base end portion of the left arm portion and the right arm portion and the horizontally long portion is shorter than a length between the base end portion of the left arm portion and the right arm portion and the connecting portion.
The electroencephalogram measuring device according to any one of claims 1 to 4 . The electrode portion has a symmetrical shape.
The electroencephalogram measuring device according to any one of claims 1 to 5. An electrode unit that is detachable from a device main body of an electroencephalogram measuring device,
a sheet-like horizontally elongated portion on which at least two forehead electrodes are provided side by side;
a vertically elongated portion extending vertically from the horizontally elongated portion and having a connection portion at a tip end for connection to the device main body;
a left arm portion and a right arm portion which are branched to the left and right from the vertically long portion, and then extend in a bent or curved manner in the vertical direction, and have a left ear electrode and a right ear electrode provided at their tips, respectively;
having
The length between the base end of the left arm and the right arm and the horizontally elongated portion is 5 to 10 cm .