| 摘要 |
<p>A pen type coordinate indicator for a position input device is provided, which is capable of widening a detection range of a pressing pressure (pen pressure) and which is capable of appropriately detecting a change in the pressing pressure without erroneous (false) detection. A coil spring (i.e., a first elastic body) and a silicon rubber (i.e., a second elastic body) are interposed between the two facing end surfaces of a first ferrite core, around which a coil connected to a resonance circuit is wound, and a second ferrite core. The coil spring and the silicon rubber operate in accordance with a pressing pressure applied to a core body, and thus a distance between the two facing end surfaces of the first ferrite core and the second ferrite core is controllably changed (narrowed) depending on the pressing pressure. As a result, an inductance value of the coil wound around the first ferrite core is controllably changed and thus a phase (frequency) of an electric wave transmitted from the resonance circuit to a position detector is controllably changed.</p> |
