COORDINATE INPUT DEVICE, CONTROL METHOD OF THE SAME AND PROGRAM THEREOF

PROBLEM TO BE SOLVED: To provide a coordinate input device that can calculate a highly accurate coordinate without being affected by a change in a surrounding environment state.SOLUTION: A coordinate input device is configured to: acquire non-light projection data indicative of a light-amount distribution to be obtained by light reception means in a state where the coordinate input device is not projected by light projection means, and light projection data indicative of a light-amount distribution to be obtained by the light reception means in a state where the coordinate input device is projected by the light projection means; store the non-light projection data and the light projection data in a memory as reference non-light projection data and reference light projection data, respectively, and manage the reference non-light projection data and the reference light projection data; and detect a coordinate of a position instructed in an input area, using the reference non-light projection data and the reference light projection data, and acquired light projection data. The coordinate input device is configured to update the reference non-light projection data and the reference light projection data stored in the memory, using the acquired non-light projection data.SELECTED DRAWING: Figure 7 【課題】周囲の環境状態の変化に影響を受けることなく、高精度の座標を算出する事が出来る座標入力装置を提供する。【解決手段】座標入力装置は投光手段により投光されていない状態で受光手段により得られる光量分布を示す非投光データと、投光手段により投光されている状態で受光手段により得られる光量分布を示す投光データとを取得し、それぞれを基準非投光データと基準投光データとしてメモリに記憶して管理し、基準非投光データおよび基準投光データと、取得された投光データを用いて、入力領域において指示された位置の座標を検出する。座標入力装置は、取得した非投光データを用いて、メモリに記憶されている基準非投光データと基準投光データを更新する。【選択図】 図７