Touch pad

A touch pad, comprising:

• a printed circuit board having an upper surface and a lower surface;
• a plurality of column-conductor groups including plural first column-conductors provided on the upper surface and plural second column-conductors provided on one of the upper surface and the lower surface and electrically connected to the first column-conductors;
• and
• a plurality of row-conductor groups including plural first row-conductors provided on the upper surface and plural second row-conductors provided on the other of the upper surface and the lower surface and electrically connected to the first row-conductors;
• wherein a portion of the second column-conductors are provided on the upper surface, the rest of the second column-conductors are provided on the lower surface, a portion of the second row-conductors are provided on the upper surface, the rest of the second row-conductors are provided on the lower surface, so that the second column-conductors and the second row-conductors are each arranged on both sides of the printed circuit board in a crisscross manner.