Living-body monitoring device

1 . A living-body monitoring device comprising:

an electronic device including a circuit board; and

a living-body wearing instrument enclosing the electronic device,

wherein a control unit, a battery, and an antenna are mounted on the circuit board,

wherein the circuit board has a length in a longitudinal direction and a length in a transverse direction and includes one or more copper-foil pattern layers,

wherein the antenna is disposed at one end in the longitudinal direction of the circuit board,

wherein the circuit board includes a first area which is an area in which the antenna is disposed and a second area which is an area other than the first area, and

wherein at least one copper-foil pattern layer of the one or more copper-foil pattern layers that is disposed in the second area is grounded.

2 . The living-body monitoring device according to claim 1 , wherein a sensor is mounted on the circuit board,

wherein the living-body wearing instrument is an intraoral instrument, and

wherein the living-body monitoring device is disposed in an oral cavity such that the longitudinal direction of the circuit board is aligned with a row of teeth.

3 . The living-body monitoring device according to claim 2 , wherein the intraoral instrument is an orthodontic appliance, a denture, or an implant.

4 . The living-body monitoring device according to claim 2 , wherein the control unit sets a first radiated radio wave intensity which is an intensity of radio waves radiated from the antenna when the living-body monitoring device is disposed inside of the oral cavity and a second radiated radio wave intensity which is an intensity of radio waves radiated from the antenna when the living-body monitoring device is disposed outside of the oral cavity to be different, and

wherein a ratio of the second radiated radio wave intensity to the first radiated radio wave intensity is equal to or greater than 0.1 and equal to or less than 0.2.

5 . The living-body monitoring device according to claim 2 , wherein the antenna is located on a lip side in the oral cavity when the living-body monitoring device is disposed in the oral cavity.

6 . The living-body monitoring device according to claim 2 , wherein a main lobe of a radiation pattern of the antenna is directed outside of the oral cavity via the lips when the living-body monitoring device is disposed in the oral cavity.

7 . The living-body monitoring device according to claim 1 , wherein the antenna is a monopole antenna.

8 . The living-body monitoring device according to claim 1 , wherein the battery is disposed on a side opposite to the antenna with the control unit interposed therebetween.

9 . The living-body monitoring device according to claim 1 , wherein the circuit board includes a long side and a short side, and

wherein a ratio of a length of the long side to a length of the short side is equal to or greater than 2.

10 . The living-body monitoring device according to claim 9 , wherein the short side is less than 15 mm the long side is less than 30 mm and the ratio of the length of the long side to the length of the short side is equal to or greater than 3.5 and equal to or less than 7.

11 . The living-body monitoring device according to claim 1 , wherein the living-body monitoring device is disposed on a palate side in the oral cavity.

12 . The living-body monitoring device according to claim 1 , wherein a sensor is mounted on the circuit board,

wherein the living-body wearing instrument is an intraoral instrument,

wherein the sensor detects an open/closed state of the lips of a wearer of the living-body monitoring device, and

wherein the control unit switches a communication status according to the open/closed state of the lips of the wearer of the living-body monitoring device detected by the sensor.