POINTER, POSITION DETECTION APPARATUS AND POSITION DETECTION METHOD

摘要

A position detection apparatus of the electrostatic coupling type is provided, to detect not only a position of a pointer but also information other than the position information such as, for example, pointer pressure or side switch information. The pointer transmits two codes such that a pressure applied to a pen tip is associated with a time difference between the two codes. A position detector carries out a correlation matching operation between signals generated in reception conductors and correlation calculation codes corresponding to the two codes, to thereby detect a position on a sensor section pointed to by the pointer from a result of the correlation matching operation and based on at least one of the codes. The position detector further includes a pressure calculation circuit for detecting pressure applied to the pointer, which is associated with the time difference between the two codes, from the result of the correlation matching operation calculated by the correlation matching operation and based on the two codes.

主权项

1. A pen-shaped position indicator configured to be capacitively coupled with a sensor surface to indicate a position on the sensor surface, the pen-shaped position indicator comprising:
a pen-shaped body; a position indicating tip extending from a distal end of the pen-shaped body; and plural electrode pieces provided near the distal end of the pen-shaped body, the plural electrode pieces being electrically separated from each other and arranged to collectively form a columnar shape that surrounds a central axis of the pen-shaped body; wherein angular information of the pen-shaped position indicator is obtained based on plural capacitive relationships which are respectively formed between the plural electrode pieces and the sensor surface.