<p>The present invention relates to an optical mouse using photosensitive IC, and more particular, relates to an optical mouse which has a penholder and can input characters by hand writing. The present invention provides a hand writing mouse pen according to the custom in writing Chinese characters or drawing paintings by ordinary people, it allows the penholder's up-down, left-right or forward-backward movement. It catches the penholder's moving track accurately. It suits with different people's writing habit and can be used in several software platform.</p>
