JP2007089676A - Myoelectric potential detector and input interface apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily mount a myoelectric potential detector to a human body and to stably detect myoelectric potential occurring with muscle contraction. <P>SOLUTION: On a contacting surface to the skin of a sheet part 20 formed of flexible and extensible material having two conductive layers 22 and 24 inserting an insulator 26 therebetween, a plurality of myoelectric potential measurement elements 30 are arranged and connected with external signal obtaining parts through a coaxial cable electrically connected with the two conductive layers 22 and 24. The signal obtaining part obtains a myoelectric potential signal measured by each of the plurality of myoelectric potential measurement elements 30 by communicating individually with the plurality of myoelectric potential measurement elements 30 by using element IDs imparted respectively to the plurality of myoelectric potential measurement elements 30. Thus, by winding the flexible and extensible sheet 20 on the human body, the detector is mounted easily, so that the myoelectric potential is stably detected while sufficient contact pressure is kept. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a myoelectric potential detection device that detects a myoelectric potential generated with muscle contraction and an input interface device including the same.

Conventionally, as this kind of myoelectric potential detection device, an electrode for measuring myoelectric potential attached to a human skin in contact with a human skin (see, for example, Patent Document 1), or a surface electrode that can be attached to a hand The one provided on the inner surface of the band (for example, see Patent Document 2) has been proposed. In the former apparatus, by using a flexible material for the electrode or using a flexible substrate in which the electrode is formed of a conductive pattern, the myoelectric potential can be stably measured by bringing the electrode into close contact with the skin. In the latter apparatus, the surface electrode is provided on the inner surface of the band so that the surface electrode can be easily attached to the human body.
JP 2003-169781 A JP-A-8-229015

  However, in the above-described myoelectric potential detection device, when it is intended to measure myoelectric potential by arranging a large number of electrodes (for example, arranged in a two-dimensional array), it is necessary to individually wire each electrode. As the number of electrodes increases, the number of wirings increases, and as a result, the movable range is limited when worn on a person's arm, hand, foot, or the like. Like the former myoelectric potential detection device described above, even when considering wiring to be printed on a flexible substrate, the elasticity of the wiring is not sufficient so that the curvature of human arms, hands, feet, etc. is large. When mounting, it may not be possible to mount with sufficient contact pressure, or the wiring may be disconnected due to repeated mounting.

  The myoelectric potential detection device of the present invention and the input interface device including the same solve such problems, and even when a plurality of myoelectric potential measuring elements are arranged, the contact state of each myoelectric potential measuring element with the skin is more appropriate. One of the purposes is to enable stable detection of myoelectric potential. One of the objects of the myoelectric potential detection device of the present invention and the input interface device including the same is to make it easier to wear even if a plurality of myoelectric potential measuring elements are arranged.

  In order to achieve at least a part of the above-described object, the myoelectric potential detection device and the input interface device including the same of the present invention employ the following means.

The first myoelectric potential detection apparatus of the present invention comprises:
A myoelectric potential detecting device for detecting a myoelectric potential generated with muscle contraction,
A flexible sheet member having a first conductive layer and a second conductive layer disposed to face each other at a predetermined interval;
A plurality of myoelectric potential measuring elements attached to the sheet member in a state of being electrically connected to the first conductive layer and the second conductive layer and capable of measuring a myoelectric potential signal in a state of being in contact with the skin When,
The myoelectric potential signals that are electrically connected to the plurality of myoelectric potential measuring elements through the first conductive layer and the second conductive layer and measured by each of the plurality of myoelectric potential measuring elements through communication are obtained. Myoelectric potential acquisition means for acquiring;
It is a summary to provide.

  In the first myoelectric potential detection device of the present invention, a plurality of myoelectric potential measuring elements capable of measuring a myoelectric potential signal in contact with the skin are arranged with a first conductive layer arranged to face each other at a predetermined interval. A flexible sheet member having a second conductive layer is attached in a state of being electrically connected to the first conductive layer and the second conductive layer, and the myoelectric potential acquisition means is connected to the first conductive layer and the second conductive layer. Are electrically connected to the plurality of myoelectric potential measuring elements via the conductive layer, and the myoelectric potential measured by each of the plurality of myoelectric potential measuring elements is acquired by communication. Therefore, since it is not necessary to individually wire each of the plurality of myoelectric potential measuring elements, it is possible to avoid a problem caused by individually wiring each of the plurality of myoelectric potential measuring elements. As a result, even when a plurality of myoelectric potential measuring elements are arranged, myoelectric potential can be stably detected with the contact state of each myoelectric potential measuring element with the skin being more appropriate.

The second myoelectric potential detection device of the present invention comprises:
A myoelectric potential detecting device for detecting a myoelectric potential generated with muscle contraction,
A flexible sheet member having a first conductive layer and a second conductive layer disposed to face each other at a predetermined interval;
With the region between the first conductive layer and the second conductive layer as a signal transmission region, it is attached to the sheet member so that signals can be transmitted and received using electromagnetic waves of a predetermined frequency band, and in contact with the skin A myoelectric potential measuring element capable of measuring a myoelectric potential signal;
A myoelectric potential acquisition means capable of transmitting and receiving signals using the electromagnetic waves of the predetermined frequency band in the signal transmission region, and acquiring a myoelectric potential signal measured by each of the plurality of myoelectric potential measuring elements by communication;
It is a summary to provide.

  In the second myoelectric potential detection device of the present invention, a plurality of myoelectric potential measuring elements capable of measuring a myoelectric potential signal in contact with the skin are arranged with a first conductive layer opposed to each other at a predetermined interval. A flexible sheet member having a second conductive layer is attached so that a signal can be transmitted and received using an electromagnetic wave of a predetermined frequency band with a region between the first conductive layer and the second conductive layer as a signal transmission region. The myoelectric potential measured by each of the plurality of myoelectric potential measuring elements is acquired by communication by the myoelectric potential acquiring means capable of transmitting and receiving signals using electromagnetic waves of a predetermined frequency band in the transmission region. Therefore, since it is not necessary to individually wire each of the plurality of myoelectric potential measuring elements, it is possible to avoid a problem caused by individually wiring each of the plurality of myoelectric potential measuring elements. As a result, even when a plurality of myoelectric potential measuring elements are arranged, myoelectric potential can be stably detected with the contact state of each myoelectric potential measuring element with the skin being more appropriate.

  In the first or second myoelectric potential detection apparatus of the present invention, identification information is stored in each of the plurality of myoelectric potential measuring elements, and the myoelectric potential acquisition means performs the communication using the identification information. Thus, it may be a means for detecting a myoelectric potential measured by each of the plurality of myoelectric potential measuring elements. In this way, the myoelectric potential measured by each of the plurality of myoelectric potential measuring elements can be detected by a simple method.

  In the first or second myoelectric potential detection device of the present invention, the sheet member may be a stretchable member. In this way, the contact state of the myoelectric potential measuring element with the skin can be improved, and the myoelectric potential can be detected more stably.

  Furthermore, in the first or second myoelectric potential detection device of the present invention, the sheet member may be formed in a band shape that can be wound around a predetermined part of a person. In this way, it is possible to make the attachment to the predetermined part easier. In this aspect of the first or second myoelectric potential detection device of the present invention, the plurality of myoelectric potential measuring elements are arranged so that myoelectric potential signals are measured over the entire circumference around the predetermined site. It can also be. In this way, the myoelectric potential can be detected without depending on the shift in the rotation direction of the band, and the alignment when detecting the myoelectric potential of a predetermined part of the person can be made unnecessary or easy.

  In the first or second myoelectric potential detection device of the present invention, each of the plurality of myoelectric potential measuring elements may include amplification means for amplifying the measured myoelectric potential signal. By doing so, it is possible to make it less susceptible to external noise. In this aspect of the first or second myoelectric potential detection device of the present invention, each of the plurality of myoelectric potential measuring elements includes an A / D converter that converts myoelectric potential signals amplified by the amplifying means into digital signals. It can also be. In this way, it is possible to make it less susceptible to external noise.

  In the present invention, in addition to the above-described myoelectric potential detection device, an input interface device including the myoelectric potential detection device may be used.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is an explanatory view showing a state in which a myoelectric potential detection device 10 according to an embodiment of the present invention is worn on a person's forearm, and FIG. 2 shows the seat 20 from the side of the contact surface with the skin. FIG. 3 is a perspective view of the sheet portion 20 viewed from the side opposite to the contact surface with the skin, and FIG. 4 is a circuit configuration of the myoelectric potential detection device 10 of the embodiment. It is a circuit block diagram which shows an example.

  As shown in the figure, the myoelectric potential detection device 10 of the first embodiment is disposed over the entire circumference of the forearm on the contact surface between the seat 20 that can be wound around a person's forearm and the skin in the seat 20. A plurality (n) of myoelectric potential measuring elements 30 that measure myoelectric potentials generated as a result of muscle contraction, and n myoelectric potential measuring elements 30 that are electrically connected to the n myoelectric potential measuring elements 30 through a coaxial cable 42, are communicated. And a signal acquisition unit 50 that can individually acquire the myoelectric potential signal measured by each of the potential measuring elements 30.

  As shown in FIGS. 2 and 3, the sheet portion 20 is configured as a three-layered sheet body in which an insulator (dielectric material) 26 is sandwiched between two conductive layers 22 and 24. The two conductive layers 22 and 24 are both made of a flexible and shrinkable conductive material (for example, conductive cloth or rubber), and the insulator 26 is a flexible and shrinkable insulating material. Made of an insulating material (for example, an insulating cloth or rubber). In the conductive layer 22 on the contact surface side with the skin in the sheet portion 20, n openings 22a are formed in a two-dimensional array, and each of the n myoelectric potential measuring elements 30 is formed in each of the openings 22a. Each is attached. A hook surface 28a of a hook-and-loop fastener is formed at an end portion of the conductive layer 22 on the contact surface side of the sheet portion 20 with the skin, and an end of the conductive layer 24 on the surface side opposite to the contact surface of the sheet portion 20 with the skin. A loop surface 28b of a hook-and-loop fastener is formed on the portion, so that the seat portion 20 can be attached to the forearm by pressing the hook surface 28a against the loop surface 28b while the seat portion 20 is wound around the forearm. It has become. In addition, a connector 40 for electrically connecting the two conductive layers 22, 24 and the signal acquisition unit 50 (coaxial cable 42) is attached to the sheet unit 20. FIG. 5 shows an example of the internal structure of the connector 40. As shown in the figure, the connector 40 is attached to an opening 24 a formed in the conductive layer 24 to make electrical connection between the two conductive layers 22 and 24 and the coaxial cable 42.

  Further, as shown in FIG. 4, the myoelectric potential detection apparatus 10 of the first embodiment is electrically connected to each of the n myoelectric potential measuring elements 30 with respect to the signal acquisition unit 50 via a coaxial cable 42. The signal acquisition unit 50 is connected, and can communicate with the n myoelectric potential measuring elements 30 between the two conductive layers 22 and 24 by a signal potential of a low bit rate (for example, several tens of kbps). Yes. A DC power supply 29a is connected to the signal lines of the two conductive layers 22 and 24 via a coil 29b. Therefore, the potential of the signal line can be easily changed at an angular frequency ω where Lω is a predetermined value (for example, 1 kΩ) or more when the inductance of the coil 29b is L. For this reason, only one of the terminals connected to the signal line (terminal of the myoelectric potential measuring element 30 or the signal acquisition unit 50) transmits an AC signal having an angular frequency ω, and the other terminals are in a high input impedance state. In the reception state, the transmission signal is detected at all terminals. Therefore, for example, the signal code can be transmitted by a standard method such as ASK (Amplitude Shift Keying) by changing the amplitude of the AC signal having the angular frequency ω. Further, since the n myoelectric potential measuring elements 30 are connected to the DC power supply 29a, they can operate upon receiving power from the DC power supply 29a. The signal acquisition unit 50 is connected to the computer 60 by a cable 62 so that signals can be exchanged as necessary.

  FIG. 6 is a configuration diagram showing an outline of the configuration of the myoelectric potential measuring element 30. As shown in the figure, each of the n myoelectric potential measuring elements 30 includes an electrode part 32 including two measurement electrodes 32a and 32b and one reference electrode 32c, and the measurement electrode 32a and the reference electrode 32c. The common-mode noise added in common to both potential differences by amplifying the difference between the potential difference generated between and the measurement electrode 32b and the reference electrode 32c (around hum noise or the like that fluctuates the reference potential of the apparatus) A differential amplifier 34 that amplifies a myoelectric potential signal that enters in opposite phase with respect to both potential differences, and a filter that cuts unnecessary frequency components from the myoelectric potential signal amplified by the differential amplifier 34. (A high-pass filter, a low-pass filter, a band-pass filter, a notch filter, etc.) An A / D converter 38 for converting to a digital signal having a wave number (for example, a sampling frequency of 10 kHz for a myoelectric signal appearing as a signal of several tens kHz to several kHz), and storing the stored digital signal And a communication unit 39 that transmits a signal from the two electrodes 39a and 39b to the signal acquisition unit 50 via the conductive layers 22 and 24 as required. The communication unit 39 stores element IDs necessary for identifying each individual when communicating with the signal acquisition unit 50.

  The operation of the myoelectric potential detection apparatus 10 of the first embodiment configured as described above, particularly the operation when the signal acquisition unit 50 acquires the myoelectric signal measured by each of the n myoelectric potential measuring elements 30 will be described. . FIG. 7 is a flowchart illustrating an example of a signal acquisition process executed by the signal acquisition unit 50 of the myoelectric potential detection apparatus 10 according to the first embodiment. This routine is repeatedly executed every predetermined time.

  In the signal acquisition process, first, a process for simultaneously transmitting (broadcasting) a response request to all the n myoelectric potential measuring elements 30 by designating an element ID is performed (step S100). The response request command includes an element ID, and the ID is a value of 1 (here, the myoelectric potential signal among the n myoelectric potential measuring elements 30 when the execution of this process is started). Is set to a value indicating the first element to acquire). The n myoelectric potential measuring elements 30 that have received the response request by simultaneous transmission collate the element ID related to the response request with their own element ID, and ignore the response request as it is when the element IDs do not match. When they match, a process of transmitting the measured myoelectric potential signal (digital signal) to the signal acquisition unit 50 is performed. When a myoelectric potential signal is received from the myoelectric potential measuring element 30 having an element ID that matches the specified element ID (step S110), the element ID is incremented by 1 (step S120), and the incremented element ID and the value n + 1 are (Step S130), and if it is determined that the element ID is less than the value n + 1, the process returns to step S100 in order to acquire the myoelectric potential signal from the next myoelectric potential measuring element 30, and the processes of steps S100 to S120 are repeated. If the element ID is determined to be the value n + 1, a process of outputting the acquired myoelectric potential signal to the computer 60 assuming that all the myoelectric potential signals of the n myoelectric potential measuring elements 30 have been acquired is performed (step S140). The acquisition process ends.

  Thus, the computer 60 that has input the myoelectric potential signal from the signal acquisition unit 50 analyzes the input myoelectric potential signal. In the embodiment, since the myoelectric potential measuring element 30 is arranged on the contact surface of the sheet portion 20 with the skin over the entire circumference of the forearm, it can be analyzed cyclically as a two-dimensional pattern around the forearm. By using such myoelectric potential signals, for example, it is possible to examine which muscle is active and how much it is used for motion analysis of athletes, etc., and when this device is wrapped around the forearm It can be used as an input device for inputting data to an information terminal such as a mobile phone or PDA because it knows whether the finger is moving, or as a nerve pulse to muscles when a myoelectric signal tries to cause a person to move It can be used as an input device for operating devices that support human movements such as prosthetic hands and prosthetic legs by using what happens, and since a myoelectric potential signal is generated before the actual movement starts, operation delays in the remote operation system As various input interface devices such as use as an input device that can be solved, and use as an input device that involves operations such as games It is possible to use.

  According to the myoelectric potential detection device 10 of the first embodiment described above, the n myoelectric potential measuring elements 30 are provided on the flexible and stretchable sheet portion 20 having the two conductive layers 22 and 24 sandwiching the insulator 26. And a myoelectric potential signal measured by each of the n myoelectric potential measuring elements 30 via the two conductive layers 22 and 24 of the sheet portion 20 is acquired by communication, so that the sheet is flexible and stretchable. The myoelectric potential can be detected in a state where a sufficient contact pressure is maintained by mounting the part 20 around the human body (forearm). As a result, the myoelectric potential can be detected more stably. In addition, since wiring is not performed individually for the n myoelectric potential measuring elements 30, defects due to wiring individually for the n myoelectric potential measuring elements 30, for example, the risk of disconnection or myoelectric potential are detected. In addition, it is possible to avoid problems such as restricting the movement of the human body, and to detect the myoelectric potential signal more stably. Further, since the myoelectric potential measuring element 30 is arranged over the entire circumference of the forearm, the two-dimensional pattern of the detected myoelectric potential signal is analyzed by a computer, and the location where each muscle exists is identified by calculation. It is possible to detect a myoelectric potential signal that does not depend on a shift in the rotation direction, and it is possible to eliminate the necessity of alignment of the sheet portion 20 or to facilitate alignment. As a result, the myoelectric potential detection device 10 can be more easily mounted.

  Here, the sheet portion 20 having the two conductive layers 22 and 24 sandwiching the insulator 26 of the embodiment corresponds to a sheet member, and the n myoelectric potential measuring elements 30 correspond to a plurality of myoelectric potential measuring elements. The signal acquisition unit 50 that executes the signal acquisition process 7 corresponds to myoelectric potential acquisition means.

  Next, the myoelectric potential detection apparatus according to the second embodiment will be described. The myoelectric potential detection apparatus of the second embodiment mainly has the same configuration as the myoelectric potential detection apparatus 10 of the first embodiment except that the myoelectric potential measuring element 130, the connector 140, and the signal acquisition unit 150 are different. Yes. Therefore, the same components as those of the myoelectric potential detection device 10 of the first embodiment are denoted by the same reference numerals among the components of the myoelectric potential detection device of the second embodiment, and detailed description thereof will be omitted because it is duplicated.

  FIG. 8 is a perspective view of the sheet part 20 of the myoelectric potential detection device of the second embodiment as seen from the side of the contact surface with the skin, and FIG. 9 is a sheet part 20 of the myoelectric potential detection device of the second example. FIG. 10 is a configuration diagram showing an outline of the configuration of a plurality of myoelectric potential measuring elements 130 arranged on the sheet portion 20, as viewed from the side opposite to the contact surface with the skin. FIG. 11 is an explanatory diagram showing an example of the shape of the connector 140 that is brought close to the seat portion 20.

  As shown in FIG. 8, n myoelectric potential measuring elements 130 are attached to the sheet portion 20 so that the two electrodes 139 a and 139 b are close to the opening 22 a formed in the conductive layer 22. The n myoelectric potential measuring elements 130 are attached to n openings 22a formed in a two-dimensional array on the conductive layer 22 on the contact surface side of the sheet portion 20 with the skin, as shown in FIG. In addition, each of them includes an electrode unit 32, a differential amplifier 34, a filter 36, and an A / D converter 38, which are the same as those of the myoelectric potential measuring element 30 of the first embodiment, and the communication of the first embodiment. Instead of the unit 39, a wireless communication unit 139 capable of applying a high-frequency electric field (for example, 2.4 GHz microwave) from the two electrodes 139a and 139b to the opening 22a is provided.

  In addition, as shown in FIG. 9, a connector 140 for enabling communication between the myoelectric potential measuring element 130 and the signal acquisition unit 150 is disposed on the seat unit 20 in a state of being close to each other. As shown in FIG. 11, the connector 140 is used in a state of being close to the opening 24a formed in the conductive layer 24 on the surface opposite to the contact surface with the skin, and spreads in a direction close to the opening 24a. The inner electrode 140a having a triangular cross section and the outer electrode 140b disposed at a predetermined interval with respect to the inner electrode 140a and having an inner cross section having a triangular shape and a convex outer cross section. It is configured by shape. The connector 140 is connected to the signal acquisition unit 150 by a coaxial cable 142 via an impedance matching unit (not shown), and wirelessly transmits and receives microwaves from the signal acquisition unit 150 with the connector 140 being close to the opening 24a. It can communicate with the communication unit 139. Such a communication method utilizes the fact that it is shown that when a high frequency electric field is applied between the two conductive layers 22 and 24, the electromagnetic wave propagates isotropically. Therefore, if an element ID for identifying each individual is stored in the wireless communication unit 139, the signal acquisition unit 150 performs communication by designating the element ID in the same manner as in the signal acquisition process of FIG. A myoelectric potential signal measured by each of the myoelectric potential measuring elements 30 can be acquired. Also in this case, as in the first embodiment, the signal code is transmitted by a standard method such as ASK. The n myoelectric potential measuring elements 30 can be driven by receiving power supplied from the signal acquisition unit 150 by microwave power transmission. Of course, the present invention is not limited to this, and power sources may be mounted on the n myoelectric potential measuring elements 30.

  According to the myoelectric potential detection device of the second embodiment described above, the conductive layer 22 of the flexible and stretchable sheet portion 20 having the two conductive layers 22 and 24 sandwiching the insulator (dielectric) 26 is formed. N myoelectric potential measuring elements 30 are arranged in the n openings 22a formed, and between the two conductive layers 22 and 24 via a connector 140 close to the opening 24a formed in the conductive layer 24. Since a myoelectric potential signal measured by each of the n myoelectric potential measuring elements 30 is acquired by applying a high frequency electric field (microwave) to the same, the same as the myoelectric potential detecting apparatus 10 of the first embodiment. The effect of can be produced. Moreover, since electromagnetic waves are exchanged between the two conductive layers 22 and 24, leakage of electromagnetic waves can be suppressed.

  In the myoelectric potential detection apparatus of the second embodiment, the shape of the connector 140 shown in FIG. 11 is adopted. However, the shape is not limited to the shape of FIG. 11, and for example, FIG. 12 and FIG. As shown in FIG. 13, in place of the inner electrode 140a, a thin conductive wire 240a forms a loop and can transmit and receive electromagnetic waves even in a shape where it is connected to one point of a circularly symmetric outer electrode 240b. Any shape may be adopted as long as the shape is suitable for the above. Further, the shapes of the connectors 140 and 240 illustrated in FIGS. 11 and 12 may be used as the shapes of the electrodes 139a and 139b of the myoelectric potential measuring element 130. In this case, in order to further reduce the size of the myoelectric potential measuring element 130, it is desirable to perform communication using a high frequency such as a 5 GHz band.

  In the myoelectric potential detection device of the second embodiment, the electrodes 139a and 139b of the myoelectric potential measuring element 130 are arranged apart from the two conductive layers 22 and 24. However, in the myoelectric potential detection device 10 of the first embodiment, Similar to the electrodes 39a and 39b of the myoelectric potential measuring element 30, the electrodes 139a and 139b of the myoelectric potential measuring element 130 are arranged in electrical connection with the two conductive layers 22 and 24, respectively, and electromagnetic waves are transmitted and received in this state. It may be a thing. Further, in the myoelectric potential detection device of the second embodiment, it is arranged close to the seat portion 20 like the connectors 140 and 240 of FIG. 11 and FIG. 12, but as shown in FIG. 14 and FIG. The width of the corner of the sheet portion 20 is smoothly changed so that impedance matching is performed at the joint portion 340 with the coaxial cable 142, and the inner conductor and the outer conductor of the coaxial cable 142 are respectively connected to the two conductive layers 22 and 24 at the joint portion 340. It is good also as what is directly connected to and transmits / receives electromagnetic waves in this state.

  In the myoelectric potential detection device of the second embodiment, the myoelectric potential signals measured by each of the n myoelectric potential measuring elements 130 are directly communicated between the n myoelectric potential measuring elements 130 and the signal acquisition unit 150. Although it was supposed to be acquired, measurement was performed by each of the n myoelectric potential measuring elements 130 while relaying some of the n myoelectric potential measuring elements 30 depending on the communicable range of the individual myoelectric potential measuring elements 30. A myoelectric potential signal may be acquired. At this time, a unit may be configured for each of a plurality of elements, and transfer may be performed while performing information compression for each unit every time signal is transferred.

  In the myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment, the signal acquisition units 50 and 150 are connected to the seat unit 20 via the coaxial cables 42 and 142. The units 50 and 150 may be integrally attached to the seat unit 20, or conversely, the computer 60 may be integrated with the functions of the signal acquisition units 50 and 150 and directly controlled from there. Alternatively, the signal acquisition units 50 and 150 may be integrally attached to the seat unit 20 and the data may be wirelessly transmitted by a standard wireless unit. This eliminates the cable and makes it easier to install.

  In the myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment, the two conductive layers 22 and 24 are formed as continuous layers. However, the present invention is not limited to this. One or both of the two conductive layers 22 and 24 may be formed in a mesh shape.

  In the myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment, the opening 22a of the sheet portion 20 is formed in a circular shape, but it is formed in any shape such as a rectangle or a square. Also good.

  In the myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment, the band-type device that is wound around the forearm is formed, but is not limited to the band-type device. It is good also as what is affixed on the site | part which measures myoelectric potential by adhesion | attachment.

  In the myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment, the myoelectric potential measuring element 30 is arranged over the entire circumference of the forearm, but it is not necessarily arranged over the entire circumference. It is not necessary, and it may be arranged only in a part of the area.

  The myoelectric potential detection device 10 of the first embodiment and the myoelectric potential detection device of the second embodiment have been described as applied to those worn on the forearm. However, the present invention is not limited to this, and other things such as legs, thighs, girth, hands, etc. It may be attached to any part. For example, it is possible to speed up braking by mounting the present device on the foot of a driver of an automobile and operating an electronically controlled brake by predicting the braking operation of the automobile from a myoelectric potential.

  In the embodiment, the sheet portion 20 on which the n myoelectric potential measuring elements 30 are arranged is wound around the human body and described as the form of the myoelectric potential detection device that detects the myoelectric potential signal generated along with the muscle contraction. It is good also as a form of an input interface provided with an electric potential detection apparatus.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention can be used in the manufacturing industry of myoelectric potential detection devices.

It is explanatory drawing which shows a mode that the myoelectric potential detection apparatus 10 as one Example of this invention is mounted | worn with a person's forearm. It is the perspective view which looked at the sheet | seat part 20 from the contact surface with skin. It is the perspective view which looked at the sheet | seat part 20 from the surface on the opposite side to a contact surface with skin. It is a circuit block diagram which shows an example of a circuit structure of the myoelectric potential detection apparatus 10 of an Example. 2 is an internal configuration diagram showing an outline of an internal configuration of a connector 40. FIG. 2 is a configuration diagram showing an outline of the configuration of a myoelectric potential measuring element 30. FIG. It is a flowchart which shows an example of a signal acquisition process. It is the perspective view which looked at the sheet | seat part 20 of the myoelectric battery detection apparatus 110 of 2nd Example from the contact surface with skin. It is the perspective view which looked at the sheet | seat part 20 of the myoelectric potential detection apparatus of 2nd Example from the surface opposite to the contact surface with skin. 3 is a configuration diagram showing an outline of a configuration of a myoelectric potential measuring element 130. FIG. It is explanatory drawing which shows an example of the shape of the connector. It is explanatory drawing which shows the shape of the connector 240 of a modification. It is explanatory drawing which shows the shape of the connector 240 seen from the A direction of FIG. It is explanatory drawing which shows the junction part 340 of a modification. It is an internal block diagram which shows the outline of the internal structure of the junction part 340 of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Myoelectric potential detection apparatus, 20 Sheet | seat part, 22, 24 Conductive layer, 22a, 24a Opening part, 26 Insulator (dielectric), 28a Hook surface, 28b Loop surface, 29a DC power supply, 29b Coil, 30, 130 Myoelectric potential Measuring element, 32 electrode part, 32a, 32b Measuring electrode, 32c Reference electrode, 34 Differential amplifier, 36 Filter, 38 A / D converter, 39 Communication part, 139 Wireless communication part, 39a, 39b, 139a, 139b Electrode, 40 , 140, 240 connector, 140a inner electrode, 240a thin conductor, 140b, 240b outer electrode, 42, 142 coaxial cable, 50, 150 signal acquisition unit, 60 computer, 62 cable.

Claims (9)

A myoelectric potential detecting device for detecting a myoelectric potential generated with muscle contraction,
A flexible sheet member having a first conductive layer and a second conductive layer disposed to face each other at a predetermined interval;
A plurality of myoelectric potential measuring elements attached to the sheet member in a state of being electrically connected to the first conductive layer and the second conductive layer and capable of measuring a myoelectric potential signal in a state of being in contact with the skin When,
The myoelectric potential signals that are electrically connected to the plurality of myoelectric potential measuring elements through the first conductive layer and the second conductive layer and measured by each of the plurality of myoelectric potential measuring elements through communication are obtained. Myoelectric potential acquisition means for acquiring;
A myoelectric potential detection apparatus comprising: A myoelectric potential detecting device for detecting a myoelectric potential generated with muscle contraction,
A flexible sheet member having a first conductive layer and a second conductive layer disposed to face each other at a predetermined interval;
With the region between the first conductive layer and the second conductive layer as a signal transmission region, it is attached to the sheet member so that signals can be transmitted and received using electromagnetic waves of a predetermined frequency band, and in contact with the skin A myoelectric potential measuring element capable of measuring a myoelectric potential signal;
A myoelectric potential acquisition means capable of transmitting and receiving signals using the electromagnetic waves of the predetermined frequency band in the signal transmission region, and acquiring a myoelectric potential signal measured by each of the plurality of myoelectric potential measuring elements by communication;
A myoelectric potential detection apparatus comprising: The myoelectric potential detection device according to claim 1 or 2,
Each of the plurality of myoelectric potential measuring elements stores identification information,
The myoelectric potential acquisition means is means for acquiring a myoelectric potential signal measured by each of the plurality of myoelectric potential measuring elements by performing the communication using the identification information.   The myoelectric potential detection apparatus according to claim 1, wherein the sheet member is a member having elasticity.   The myoelectric potential detection device according to any one of claims 1 to 4, wherein the sheet member is formed in a band shape that can be wound around a predetermined part of a person.   6. The myoelectric potential detection device according to claim 5, wherein the plurality of myoelectric potential measuring elements are arranged so that myoelectric potential signals are measured over the entire circumference around the predetermined part.   The myoelectric potential detection device according to any one of claims 1 to 6, wherein each of the plurality of myoelectric potential measuring elements includes an amplifying unit that amplifies the measured myoelectric potential signal.   8. The myoelectric potential detection device according to claim 7, wherein each of the plurality of myoelectric potential measuring elements includes an A / D converter that converts a myoelectric potential signal amplified by the amplifying unit into a digital signal. An input interface device comprising the myoelectric potential detection device according to claim 1.

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