Communication System

• US 20100062709A1
• Filed: 01/25/2006
• Published: 03/11/2010
• Est. Priority Date: 02/09/2005
• Status: Active Grant

• Current Assignee: Kaiser Technology Incorporated
• Original Assignee: Kaiser Technology Incorporated
• Inventors: Kato, Yasuo
• Granted Patent: US 8,340,575 B2
• Time in Patent Office: Days
• US Class Current: 455/41.100
• CPC Class Codes: G01R 29/0878 Sensors; antennas; probes; detectors wave guide measuring sections G01R1/24
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H04B 13/005 Transmission systems in which the medium consists of the human body
• CPC Class Codes: H04B 17/23 Indication means, e.g. displays, alarms, audible means
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/28 using the near field of leaky cables, e.g. of leaky coaxial cables
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils

Abstract

Stable receiving action is achieved with a receiver of simpler configuration.

When a human hand is held over the panel unit 201, the electric field in the vicinity of the human body is coupled to the sensor electrode 2122 of the coil sensor 212 from the receiving electrode 211 of the panel unit 201, and alternate current is generated at the sensor electrode 2122. This alternate current then induces a magnetic flux inside the central opening of the coil 2121 in proportion to the strength of the electric field in the vicinity of the human body. Depending on the changes in this magnetic flux, electric current passes through the coil 2121. The electric current passing through the coil 2121 is converted by the electric current detecting circuit 2124 of the coil sensor 212 to voltage signals and transmitted as received signals to the demodulator 22. As a result, the received signals corresponding to the electric field in the vicinity of the human body, namely the transmission signals applied by the transmitter 1 to the human body, are obtained.

Claims

1. A communication system comprises a transmitter, which applies transmission signals produced by modulating communication information to the conductive transmission medium and induces an electric field in the vicinity of the transmission medium, and a receiver, which demodulates the detected strength of electric field into communication information,

wherein the receiver comprises an electric field detecting unit for detecting the strength of the electric field induced by the transmission medium,

wherein the electric field detection unite comprises:

a receiving electrode, which the transmission comes close to or contacts during communication between the transmitter and the receiver,

a coil,

a sensor electrode placed close to the central opening of the coil, and

a conductive wire connecting the receiving electrode and the sensor electrode, and

wherein the coil outputs signals indicating the strength of the electric field acting upon the receiving electrode.

2. The communication system according to claim 1, wherein the electric field detecting unit has a magnetic body core inserted in the central opening of the coil and the sensor electrode is adhered to the end face of the magnetic body core.

3. The communication system according to claim 2, wherein the electric field detecting unit has a sealant with higher magnetic permeability than that of air to seal the entire sensor electrode or the periphery of the sensor electrode onto the magnetic body core.

4. The communication system according to claim 2, wherein the electric field detecting unite is equipped with plural pairs of the magnetic body core and the coil wound around the magnetic body core, and the sensor electrode is adhered to the end face of the magnetic body core of the pairs and is sandwiched between the end face of the magnetic body core of each pair of magnetic body core and the coil wound around the magnetic body core.

7. A communication according to claim 4 wherein the transmission medium is a human body or a living body.

10. A communication according to claim 1 wherein the transmission medium is a human body or a living body.

11. A communication according to claim 2 wherein the transmission medium is a human body or a living body.

12. A communication according to claim 3 wherein the transmission medium is a human body or a living body.

5. (canceled)

6. (canceled)

8. (canceled)

9. (canceled)

13. An electric field detecting device for detecting strength of an electric field, comprising:

a receiving electrode located in the electric field;

a coil;

a sensor electrode located near a central opening of the coil; and

a conductive wire connecting the receiving electrode and the sensor electrode; and

wherein the coil outputs signals indicative of the strength of the electric field acting on the receiving electrode.

14. The electric field detecting device according to claim 13, further comprising:

a magnetic body core inserted in the central opening of the coil; and

wherein the sensor electrode is adhered to an end face of the magnetic body core.

15. The electric field detecting device according to claim 14, further comprising:

a sealant, with a higher magnetic permeability that that of air, sealing the entire sensor electrode or periphery of the sensor electrode onto the magnetic body core.

16. The electric field detecting device according to claim 14, further comprising:

plural pairs of the magnetic body core and the coil wound around the magnetic body core; and

wherein the sensor electrode is adhered to an end face of the magnetic body core of ear pair and is sandwiched between the end face of the magnetic body core and the coil wound around the magnetic body core.