Patent ID: 8350559
Filing Date: 2013-01-08
Classification: G06F

Abstract:
1. A position detection apparatus, comprising: a position pointer having at least one coil; and a sensor unit comprising: (a) a sensor board including a plurality of loop coils juxtaposed and extending in a predetermined direction, the sensor unit being configured to detect a signal generated in said loop coils by electromagnetic induction between said coil of said position pointer and said loop coils to detect the position of said position pointer relative to the sensor board; (b) a shield member disposed on the side of the sensor board opposite to that of said position pointer for reducing noise, and (c) a magnetic path sheet formed from a plurality of magnetic path members of a substantially rectangular shape having a higher magnetic permeability than that of said shield member and disposed between said sensor board and said shield member; said magnetic path members having contacting portions at which said magnetic path members contact with each other; said contacting portions being disposed in an inclined relationship relative to said extending direction of the loop coils such that the contacting portions cross said extending direction at a predetermined angle.