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 capacitive position detection apparatus, comprising:
(i) a sensor surface including a first set of conductors and a second set of conductors that intersect the first set of conductors, wherein the capacitive position detection apparatus, in operation, time-divisionally detects a finger and a pen-shaped position indicator, the capacitive position detection apparatus detecting the finger by supplying signals to the first set of conductors and receiving signals from the second set of conductors, and detecting the pen-shaped position indicator by receiving detection signals from the first and second sets of conductors, the detection signals being generated in the first and second sets of conductors in response to indication signals from the pen-shaped position indicator; and (ii) the pen-shaped position indicator including: a pen-shaped body having a pen-tip portion; a first electrode arranged at a first position of the pen-tip portion; a second electrode arranged at a second position of the pen-tip portion different from the first position; and a signal production circuit configured to supply first and second signals to the first and second electrodes, respectively, wherein the first and second signals are distinguishable from each other, wherein the first and second electrodes are configured to form first and second capacitive relationships with the sensor surface, respectively, to generate detection signals in the sensor surface based on which angle information of the pen-shaped position indicator is obtainable.