Coil unit and electronic instrument
A coil unit includes a planar air-core coil that has an air-core section, a printed circuit board that is disposed on a transmission side of the planar air-core coil, and a magnetic sheet that is disposed on a non-transmission side of the planar air-core coil opposite to the transmission side. The planar air-core coil includes a lead line connected to an inner end of the planar air-core coil over the transmission side, and the printed circuit board includes a receiving section that receives the lead line.
1. A coil unit comprising:
a planar air-core coil that has an air-core section;
a printed circuit board that is disposed on a transmission side of the planar air-core coil; and
a magnetic sheet that is disposed on a non-transmission side of the planar air-core coil, the non-transmission side being opposite to the transmission side, the planar air-core coil including a lead line connected to an inner end of the planar air-core coil over the transmission side; and
the printed circuit board including a receiving section that houses the line so that an increase in a thickness of the coil unit due to the lead line is reduced.
2. The coil unit as defined in claim 1 ,
the printed circuit board including a through-hole that faces an air-core section of the planar air-core coil.
3. The coil unit as defined in claim 2 ,
a diameter of the through-hole that is formed in the printed circuit board being smaller than a diameter of the air-core section of the planar air-core coil; and
the coil unit further including a temperature detection section that is provided on a side of the printed circuit board that is placed over the planar air-core coil, the temperature detection section being provided at a position that is near the through-hole and inside an edge of the air-core section.
4. The coil unit as defined in claim 1 ,
the coil unit further including a temperature detection section that is provided on a side of the printed circuit board opposite to a side that is placed over the planar air-core coil, the temperature detection section being provided at a position on a periphery of the through-hole.
5. An electronic instrument comprising a housing that receives the coil unit as defined in claim 1 ,
the housing of the electronic instrument including a coil positioning protrusion that is formed on an inner surface of the housing, the coil positioning protrusion being inserted into the air-core section of the planar air-core coil through the through-hole that is formed in the printed circuit board to position the planar air-core coil.
6. The electronic instrument as defined in claim 5 ,
the housing of the electronic instrument including a positioning target section that determines a position of a charger.
7. The coil unit according to claim 1 ,
the receiving section is defined as an opening in the printed circuit board, and
the lead line is housed along a perimeter of the receiving section.
8. A coil unit comprising:
a planar air-core coil that has an air-core section;
a magnetic sheet that is disposed on a non-transmission side of the planar air-core coil, a first side of the magnetic sheet being placed on the planar air-core coil; and
a printed circuit board that is disposed on a second side of the magnetic sheet,
the planar air-core coil including a lead line connected to an inner end of the planar air-core coil, the lead line being provided on the non-transmission side; and
the printed circuit board including a receiving section that houses the lead line so that an increase in a thickness of the coil unit due to the lead line is reduced.
9. A coil unit comprising:
a planar air-core coil that has an air-core section;
a printed circuit board that is disposed on a transmission side of the planar air-core coil; and
a magnetic sheet that is disposed on a non-transmission side of the planar air-core coil,
the planar air-core coil including a lead line connected to an inner end of the planar air-core coil, the lead line being provided on the transmission side; and
the printed circuit board including a receiving section that houses the lead line so that an increase in a thickness of the coil unit due to the lead line is reduced.
10. An electronic instrument comprising the coil unit as defined in claim 9 .