Communication apparatus for performing data communication electrode unit and a living body

1. A communication apparatus, comprising:

a substrate provided with a reference potential electrode;

a communication unit provided on a first principal surface of the substrate;

a first signal line provided on the first principal surface of the substrate and connected at one end to the communication unit;

a terminal provided on the first principal surface of the substrate and connected at one end to the other end of the first signal line;

a second signal line provided on the first principal surface side of the substrate and connected to the first signal line through the terminal, the second signal line having one end connected to the other end of the terminal;

a signal electrode provided on the first principal surface side of the substrate and connected to the other end of the second signal line;

a housing configured to cover and accommodate therein the substrate, the communication unit, the first signal line, the terminal, the second signal line, and the signal electrode; and

a conductive material arranged on an outer side of the housing so as to be opposite to the signal electrode, and including an outer peripheral portion extended outward beyond an outer periphery of the signal electrode, wherein

the communication apparatus carries out data communication via a living body.

2. The communication apparatus according to claim 1 , wherein

capacitive coupling occurs between the living body and the conductive material and between the conductive material and the signal electrode thereby to effect the data communication.

3. The communication apparatus according to claim 1 , wherein

the terminal includes an inner conductive portion and an outer conductive portion,

the second signal line includes an inner signal line and a dielectric layer,

one end of the inner conductive portion is connected to the other end of the first signal line,

the other end of the inner conductive portion is connected to one end of the inner signal line,

the other end of the inner signal line is connected to the signal electrode, and

one end of the outer conductive portion is connected through a via to the reference potential electrode.

4. The communication apparatus according to claim 1 , wherein

the signal electrode is arranged on one side surface of an inner side of the housing, and the conductive material is arranged on at least one side surface of an outer side of the housing.

5. The communication apparatus according to claim 1 , wherein

the conductive material is provided on one end side of the housing, becomes thicker from an outer peripheral side of the housing toward a center side of the housing, and is provided with a mark on a top surface of the conductive material, and

one end portion of the housing has an arcuate shape.

6. The communication apparatus according to claim 5 , wherein

the mark indicates a contact portion for communication.

7. The communication apparatus according to claim 1 , wherein

end portions of the housing are provided with slits, and

the conductive material has a belt shape inserted into the slits and extending along one side surface of the housing and on both sides of the housing.

8. The communication apparatus according to claim 1 , wherein

the conductive material is provided on a bottom surface side of the housing, and

an electrically-conductive belt having a belt shape extending on both sides of the housing is provided.

9. The communication apparatus according to claim 1 , wherein

the conductive material is any one of an electrically-conductive metal sheet, an electrically-conductive ink, and a transparent electrode film.

10. The communication apparatus according to claim 1 , wherein

the signal electrode has a top surface in a quadrangular shape.

11. The communication apparatus according to claim 1 , wherein

during the data communication, the conductive material is in contact with the living body.

12. A communication apparatus, comprising:

a substrate provided with a reference potential electrode;

a first communication unit provided on a first principal surface of the substrate;

a first signal line provided on the first principal surface of the substrate and connected at one end to the first communication unit;

a first terminal provided on the first principal surface of the substrate and connected at one end to the other end of the first signal line;

an antenna provided on the first principal surface side of the substrate and connected to the first signal line through the first terminal, the antenna having one end connected to the other end of the first terminal;

a second communication unit provided on the first principal surface of the substrate;

a second signal line provided on the first principal surface of the substrate and connected at one end to the second communication unit;

a second terminal provided on the first principal surface of the substrate and connected at one end to the other end of the second signal line;

a third signal line provided on the first principal surface side of the substrate and connected to the second signal line through the second terminal, the third signal line having one end connected to the other end of the second terminal;

a signal electrode provided on the first principal surface side of the substrate and connected to the other end of the third signal line;

a first conductive material connected to the third signal line, and having a length equal to one-quarter wavelength of a communication frequency of the antenna;

a housing configured to cover and accommodate therein the first communication unit, the first signal line, the first terminal, the antenna, the second communication unit, the second signal line, the second terminal, the third signal line, the signal electrode, and the first conductive material;

a second conductive material arranged on an outer side of the housing so as to be opposite to the signal electrode, and including an outer peripheral portion extended outward beyond an outer periphery of the signal electrode; and

a third conductive material arranged on the outer side of the housing so as to be opposite to the first conductive material, and including an outer peripheral portion extended outward beyond an outer periphery of the first conductive material, wherein

the second communication unit carries out data communication via a living body.

13. The communication apparatus according to claim 12 , wherein

the antenna functions as a choke element.

14. The communication apparatus according to claim 12 , wherein

the substrate includes a stacked structure of a dielectric portion and the reference potential electrode, and

the dielectric portion is thinner in a portion where the first terminal and the antenna are provided, than in the rest of the dielectric portion.

15. The communication apparatus according to claim 14 , wherein

the reference potential electrode is not provided right under the first terminal and the antenna.

16. The communication apparatus according to claim 12 , wherein

the second conductive material and the third conductive material are each any one of an electrically-conductive metal sheet, an electrically-conductive ink, and a transparent electrode film.

17. The communication apparatus according to claim 12 , wherein

the signal electrode has a top surface in a rectangular shape.

18. The communication apparatus according to claim 12 , wherein

during the data communication, the second conductive material and the third conductive material are in contact with the living body.