Pen input device having malfunction prevention function and method of preventing malfunction thereof

摘要

A pen input device having malfunction prevention function and method of preventing malfunction thereof are disclosed. The pen input device includes: a housing having a bar form and having one end relatively narrowly opened to form a housing space; a resonant circuit housed within the housing; a tip that protrudes from an open end of the housing to the outside, the tip comprising a dielectric material and being configured to be movable within a predetermined range in a direction of a longitudinal axis of the housing, the tip being further configured to be self-centering; and a ground shielding portion formed in a portion of the housing in which electromagnetic induction occurs, the ground shielding portion not including the tip.