Non-contact charging module, electronic apparatus, and non-contact charging apparatus

Abstract

This non-contact charging module can be suitably used by suppressing a change of an L value of a coil that is provided in the non-contact charging module, and achieves size reduction, even in the cases where a magnet that is provided in the other non-contact charging module is used or not used. The module is characterized in that: the module is provided with a primary side coil ( 21 a) wherein a conducting line is wound in a substantially rectangular shape, and a magnetic sheet ( 51 ) that is provided with a surface on which the primary side coil ( 21 a) is placed; and that a substantially rectangular-shaped hollow portion of the primary side coil ( 21 a) has the short side thereof shorter than the diameter of a circular magnet ( 30 a), and the long side thereof longer than the diameter of the circular magnet ( 30 a).

The invention claimed is: 
     
       1. A system comprising:
 a mobile terminal that includes a rectangular-shaped housing; a circuit board and a battery included in the housing, the circuit board controlling operation of the mobile terminal and supplied with power from the battery; and a first non-contact charging module configured to perform power transmission with included in the housing; and 
 a second non-contact charging module by electromagnetic induction including a circular magnet and configured to be positioned with the second relative to the first non-contact charging module using a in reference to the circular magnet or without using the circular magnet for positioning, the circular magnet being provided at the second non-contact charging module, 
 wherein the first non-contact charging module comprisingincludes: 
 a planar coil portion including a conductive wire wound in a rectangular shape; and 
 a magnetic sheet provided with a surface on which the planar coil portion is placed, wherein
 the planar coil portion includes a rectangular-shaped hollow portion that has a plurality of short sides shorter than a diameter of the circular magnet and a plurality of long sides longer than the diameter of the circular magnet, 
 
 the rectangular-shaped hollow portion of the planar coil portion has an outline in which every short side and long side of the outline is longer than the diameter of the circular magnet, the long side of the outline is in parallel to a long side of the rectangular-shaped housing, and a distance from the long side of the outline to the closest long side of the rectangular-shaped hollow portion defines a width of the planar coil portion that is longer than the short side of the rectangular-shaped hollow portion, and
 the circular magnet is positioned on top of the planar coil portion, and 
 
 wherein the first non-contact charging module overlaps with the battery and with the circuit board in the housing. 
 
     
     
       2. A first non-contact charging device comprising the non-contact charging module according to  claim 1 . 
     
     
       3. The first non-contact charging module system according to  claim 1 , wherein the rectangular-shaped hollow portion includes a plurality of corner portions, and the circular magnet does not overlap with either the plurality of short sides of the rectangular-shaped hollow portion or the plurality of corner portions of the rectangular-shaped hollow portion. 
     
     
       4. A system comprising:
 a mobile terminal that includes a rectangular-shaped housing; a circuit board and a battery included in the housing, the circuit board controlling operation of the mobile terminal and supplied with power from the battery; and a first non-contact charging module configured to perform power transmission with included in the housing; and  
 a second non-contact charging module by electromagnetic induction including a circular magnet and configured to be positioned with the second relative to the first non-contact charging module using a in reference to the circular magnet or without using the circular magnet for positioning, the circular magnet having a diameter of 15.5 mm at maximum and being provided at the second non-contact charging module, 
 wherein the first non-contact charging module comprisingincludes: 
 a planar coil portion including a conductive wire wound in a rectangular shape; and 
 a magnetic sheet provided with a surface on which the planar coil portion is placed, wherein
 the planar coil portion includes a rectangular-shaped hollow portion that has a short side shorter than 15.5 mm and a long side longer than 15.5 mm, 
 the rectangular-shaped hollow portion of the planar coil portion has an outline in which every short side and long side of the outline is longer than the diameter of the circular magnet, the long side of the outline is in parallel to a long side of the rectangular-shaped housing, and a distance from the long side of the outline to the closest long side of the rectangular-shaped hollow portion defines a width of the planar coil portion that is longer than the short side of the rectangular-shaped hollow portion, and 
 the circular magnet is positioned on top of the planar coil portion, and 
 
 wherein the first non-contact charging module overlaps with the battery and with the circuit board in the housing. 
 
     
     
       5. The first non-contact charging module system according to  claim 4 , wherein the rectangular-shaped hollow portion includes a plurality of corner portions, and each corner portion of the plurality of corner portions includes a curved shape that starts to curve at a distance equal to 30% or less of a corresponding long side and 30% or less of a corresponding short side of the rectangular-shaped hollow portion. 
     
     
       6. The first non-contact charging module system according to  claim 5 , wherein the diameter of the circular magnet is greater than half a distance of a difference between a length of the long side of the rectangular-shaped hollow portion and the diameter of the circular magnet. 
     
     
       7. The system according to claim 4, wherein a diameter of the conductive wire of the planar coil portion is approximately 0.18 to 0.30 mm. 
     
     
       8. The system according to claim 1, wherein a diameter of the conductive wire of the planar coil portion is approximately 0.18 to 0.30 mm.