CN210961985U

CN210961985U - High-precision flexible electronic skin for gesture recognition

Info

Publication number: CN210961985U
Application number: CN201920896484.0U
Authority: CN
Inventors: 马加冀; 张树昌; 任君晖
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-07-10
Anticipated expiration: 2029-06-14

Abstract

The utility model belongs to flexible electron skin field to a flexible electron skin of high accuracy towards gesture recognition is disclosed. The flexible electronic skin comprises two electrodes, a lead and a port, wherein: the two electrodes have the same structure and are used for detecting electromyographic signals; the lead transmits the electromyographic signals collected by the electrodes to the port; the port is connected with the outside; the electrode comprises a three-layer structure, and is sequentially provided with a functional layer, a connecting layer and a basal layer from top to bottom, wherein the functional layer is used for sensing electromyographic signals, the connecting layer is used for connecting the functional layer and the basal layer, and the basal layer is used as a carrier of the functional layer and the connecting layer. The lead wire parts of the two electrodes are arranged in parallel or all the lead wires are arranged in parallel, and the distance between the two lead wires is not more than 1mm, so that the electric potential generated by the two lead wires is offset, and the compensation of the electric potential generated by the lead wires is realized. Through the utility model discloses, realize the high accuracy of the object gesture of awaiting measuring, nimble changeable and high travelling comfort's discernment.

Description

High-precision flexible electronic skin for gesture recognition

Technical Field

The utility model belongs to flexible electron skin field, more specifically relates to a flexible electron skin of high accuracy towards gesture recognition.

Background

In the world, due to the development requirement of the human-computer interaction industry, gesture recognition equipment becomes the key point of research and development of each organization, and is applied to each field. The human body controls the movement process of the human body through the combined action of the nervous system and skeletal muscles and generates myoelectricity as follows: the central nervous system performs corresponding actions by controlling corresponding muscles to excite or contract, at the moment, the electric potential on the muscle fiber can regularly fluctuate to generate myoelectric signals, and a large amount of body fluid exists in an animal body, and the body fluid can be used as a volume conductor to transmit bioelectricity change generated by muscle activity to the body surface, so that a guide electrode is arranged at any part of the body, the electric activity of the muscle can be guided through an amplifier, and the electric activity can reflect the motion state of the muscle to a certain degree.

Other mechanisms have also developed devices for gesture recognition. For example, CN201620485119.7 develops an arm ring for realizing gesture recognition by an electromyographic sensor, CN201821283234.1 discloses an infrared gesture recognition device, which recognizes each decomposition action by infrared light reflection, and finally achieves the effect of gesture recognition, and CN201821214366.9 proposes a finger stall for realizing gesture recognition by a pressure sensor; however, the gesture recognition devices proposed in these patents have one or more of the following disadvantages: 1) the measurement area is small, and the electromyographic signals of the whole arm cannot be measured. 2) The volume is great, and it is lower to wear the comfort level, and user experience is not good. 3) The equipment is complex and inconvenient to carry; therefore, for these existing problems, a new type of flexible electronic skin facing gesture recognition needs to be developed.

SUMMERY OF THE UTILITY MODEL

To the above defect of prior art or improve the demand, the utility model provides a flexible electron skin of high accuracy towards gesture recognition, it is through adopting two electrode collections when the await measuring object gesture changes, and the electric potential change that the muscle contraction that arouses produces is flesh electrical signal, realizes the high accuracy of the await measuring object gesture, nimble changeable and high travelling comfort's discernment.

In order to achieve the above object, according to the utility model discloses, a flexible electron skin of high accuracy towards gesture recognition is provided, this flexible electron skin includes two electrodes, lead wire and port, wherein:

the structure of the two electrodes is the same, the two electrodes are used for being attached to the surface of an object to be detected to detect myoelectric signals generated by muscle contraction, the lead is arranged below each electrode and is used for being connected with the electrode and a port, the myoelectric signals collected by the electrodes are transmitted to the port, and the port is connected with an external acquisition card or an upper computer and is used for transmitting the myoelectric signals collected by the electrodes to the acquisition card or the upper computer;

the electrode comprises a solid part and a hole part, the hole part is used for improving the ductility of the electrode and the fitting degree of an object to be measured, the electrode comprises a three-layer structure, and a functional layer, a connecting layer and a basal layer are sequentially arranged from top to bottom, the functional layer is used for sensing the myoelectric signals, the connecting layer is used for connecting the functional layer and the basal layer, and the basal layer is used as a carrier of the functional layer and the connecting layer.

Further preferably, the leads of the two electrodes are partially or completely arranged in parallel, and the distance between the two leads is not more than 1mm, so that the electric potentials generated by the two leads are offset, and the electric potential generated by the leads is compensated.

Further preferably, the coverage rate of the hole part is less than or equal to 66%, so as to satisfy the stretching rate of the object to be measured.

Further preferably, the thickness of the flexible electronic skin is 1 micron to 2 microns.

Further preferably, the thickness of the functional layer is 100nm to 300nm, the thickness of the connection layer is 10nm to 50nm, and the thickness of the base layer is 1 micrometer to 1.7 micrometers.

Further preferably, the functional layer is made of a conductive metal such as gold or silver, and the connection layer is made of chromium or molybdenum.

Further preferably, the material adopted by the substrate layer is PET or PI.

Further preferably, when the flexible electronic skin recognizes gestures, the flexible electronic skin is simultaneously attached to the surface of the object to be detected, and different gestures are recognized by detecting myoelectric signals at different positions.

Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:

1. the utility model adopts one or more flexible electronic skins to identify the gesture of the object to be measured, sets the number of the flexible electronic skins according to the complexity of the gesture, realizes the multi-mode switching, and can identify 24 gestures at most when eight flexible electronic skins are adopted to be attached to eight muscle surfaces on the arm; the electronic skin realizes preparation of an ultra-large area through process improvement, so that multi-channel recognition is realized, and up to 24 gesture modes can be recognized. Thereby completely meeting the requirements of users.

2. The utility model discloses an adopt flexible electrode's structure for when the electrode was on laminating skin, can laminate skin completely, it still possesses fine ductility simultaneously, can also keep the laminating with the object to be measured when the object to be measured moves, accords with the mechanical properties of skin, does not produce the foreign matter and feels, thereby makes the user obtain higher use and experiences, in addition, because flexible electrode's the entity part's coverage is high, detection object to be measured that can be more comprehensive realizes that multichannel discernment improves the detection precision:

3. the utility model discloses a mode to lead wire adoption parallel arrangement carries out the circuit compensation, compares in traditional mode, has reduced the potential error that the lead wire brought, has improved measurement accuracy for final gesture on-line recognition rate reaches 93%, and off-line recognition rate can reach 97%.

4. The utility model provides a flexible electron skin has solved the inconvenience that traditional wired connection measured and used through being connected with wireless module to can realize carrying out wireless gesture recognition's function.

Drawings

Fig. 1 is a schematic structural view of a flexible electronic skin constructed in accordance with a preferred embodiment of the present invention;

fig. 2 is a schematic diagram of an electrode structure constructed in accordance with a preferred embodiment of the present invention;

fig. 3 is a schematic diagram of a cross-sectional structure of an electrode constructed in accordance with a preferred embodiment of the present invention;

fig. 4 is a schematic diagram of a flexible electronic skin recognition gesture constructed in accordance with a preferred embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:

1-electrode, 2-lead, 3-port, 4-functional layer, 5-connecting layer and 6-basal layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, a high-precision flexible electronic skin facing gesture recognition comprises two electrodes 1, a lead 2 and a port 3, wherein:

the two electrodes 1 have the same structure and are used for being attached to the surface of skin to detect myoelectric signals generated by muscle contraction; the lead 2 is arranged below each electrode, is used for connecting the electrode 1 and the port 3, and transmits the electromyographic signals collected by the electrodes to the port 3; the port 3 is connected with an external acquisition card or an upper computer and is used for transmitting the electromyographic signals acquired by the electrodes 1 to the acquisition card or the upper computer;

as shown in fig. 2 and 3, the electrode 1 includes a solid portion and a hole portion, the hole portion is used for improving the ductility of the electrode and the degree of attachment to an object to be measured, the electrode includes a three-layer structure, which includes a functional layer 4, a connection layer 5 and a substrate layer 6 from top to bottom, the functional layer 4 is used for sensing the myoelectric signal, the connection layer 5 is used for connecting the functional layer and the substrate layer, and the substrate layer 6 is used as a carrier of the functional layer and the connection layer. The shape of the electrode is not limited, and can be rectangular, square, round or irregular, and the double electrodes are adopted because the length and the size of each muscle of the human body are different, and the electrodes are required to be customized according to the muscle.

Further preferably, the two electrodes 1 are rectangular hollow structures, the diameters of the hollow round holes are 0.2mm, and the distance between the circle centers is 1mm, so that the effect of improving the stretchability of the electrodes is realized.

Further preferably, the leads 2 of the two electrodes 1 are partially or completely arranged in parallel, and the distance between the two leads is not more than 1mm, so as to offset the electric potential generated by the two leads, and compensate the electric potential generated by the leads, the more the parallel parts of the lead parts are, the better the compensation effect on the electric potential is, therefore, in practice, the two leads are arranged in parallel as much as possible, but because a certain height difference may exist between the two electrodes, it is difficult to completely parallel the two leads.

Further preferably, the thickness of the flexible electronic skin is 1 micrometer to 2 micrometers, in this embodiment, 1.2 micrometers, wherein the thickness of the functional layer 4 is 100nm to 300nm, in this embodiment, 100nm, the thickness of the connection layer 5 is 10nm to 50nm, in this embodiment, 10nm, and the thickness of the substrate layer 6 is 1 micrometer to 1.7 micrometers, in this embodiment, 1.1 micrometer. The coverage rate of the solid part on a single electrode is more than 44%, the hole part is less than or equal to 66%, the stretching performance can meet the stretching rate of 20% of the skin, the thin and wide same-line snake-shaped structure improves the conformal capability of the electrode and the skin, the electrode coverage rate is ensured, the stretching performance is good, and the motion artifact caused by the relative displacement of the electrode and the skin can be reduced. The design of the substrate can enhance the durability of the electrode and prevent the electrode from being damaged.

Further preferably, the functional layer 4 is made of gold or silver, and since the flexible electronic skin is attached to the surface of the object to be measured, a non-toxic and highly sensitive material, for example, copper, is not used, and is toxic to the skin.

Further preferably, the base layer 5 is made of a PET film, and the base layer needs to have certain flexibility and extensibility so as to be better attached to an object to be measured.

Further preferably, the material used for the connecting layer 6 is chromium, and the connecting layer is used for connecting the substrate layer and the functional layer, and the material thereof depends on the material of the selected functional layer.

Further preferably, as shown in fig. 4, when recognizing a gesture, the flexible electronic skin is attached to the surface of the object to be detected at the same time, and different gestures are recognized by detecting the electromyographic signals at different positions. In this embodiment, when measuring human gesture, adopt eight flexible electron skins to attach respectively on eight muscles on the arm, can gather the flesh electrical signal on the arm comprehensively like this, the more simple the gesture, the flexible electron skin that adopts can be less, and the more complicated the gesture, can adopt more flexible electron skin.

The circuit compensation mode of the lead part is as follows:

the potentials of the two leads are approximately equal:

assuming uniform electrodermal properties:

wherein, V_eIs required to obtain a voltage value, V₁Is the uncompensated voltage value, V, acquired by the signal acquisition electrode₂Is the partial compensation voltage value, S, obtained by the compensation branch₁Is the area of the signal-collecting electrode, S₂To compensate for the acquisition area of the electrode, Z (ω) is the skin impedance. E₁Single point potentials collected for signal collection electrodes, E₂To compensate for the single point potentials acquired by the electrodes.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. High-precision flexible electronic skin facing gesture recognition, characterized in that it comprises two electrodes (1), a lead (2) and a port (3), wherein:

the two electrodes (1) are identical in structure and used for being attached to the surface of an object to be detected to detect myoelectric signals generated by muscle contraction, the lead (2) is arranged below each electrode and used for being connected with the electrodes (1) and the port (3) and transmitting the myoelectric signals acquired by the electrodes to the port, and the port (3) is connected with an external acquisition card or an upper computer and used for transmitting the myoelectric signals acquired by the electrodes to the acquisition card or the upper computer;

the electrode (1) comprises a solid part and a hole part, the hole part is used for improving the ductility of the electrode and the fitting degree of the electrode with an object to be measured, the electrode comprises a three-layer structure which sequentially comprises a functional layer (4), a connecting layer (5) and a basal layer (6) from top to bottom, the functional layer (4) is used for sensing the myoelectric signals, the connecting layer (5) is used for connecting the functional layer and the basal layer, and the basal layer (6) is used as a carrier of the functional layer and the connecting layer;

the lead parts of the two electrodes (1) are arranged in parallel, and the distance between the two leads (2) is not more than 1mm, so that the electric potentials generated by the two leads are offset, and the compensation of the electric potentials generated by the leads is realized.

2. The high-precision flexible electronic skin for gesture recognition according to claim 1, wherein the coverage rate of the hole part is less than or equal to 66%, so as to satisfy the stretching rate of the object to be detected.

3. The high-precision flexible electronic skin for gesture recognition according to claim 1, wherein the thickness of the flexible electronic skin is 1-2 microns.

4. The high-precision flexible electronic skin facing gesture recognition is characterized in that the thickness of the functional layer (4) is 100 nm-300 nm, the thickness of the connecting layer (5) is 10 nm-50 nm, and the thickness of the base layer (6) is 1 micrometer-1.7 micrometers.

5. The high-precision flexible electronic skin facing gesture recognition is characterized in that the functional layer (4) is made of gold or silver, and the connecting layer (5) is made of chromium or molybdenum.

6. The high-precision flexible electronic skin facing gesture recognition is characterized in that the base layer (6) is made of PET or PI.

7. The high-precision flexible electronic skin for gesture recognition according to claim 1, wherein when recognizing a gesture, the flexible electronic skin is simultaneously attached to the surface of an object to be detected by a plurality of flexible electronic skins, and different gestures are recognized by detecting electromyographic signals at different positions.