This invention provides a high-resolving-power, compact, lightweight, low-cost coordinate input apparatus which suppresses the influence of disturbance light. Signals in light emission and non-light emission states of a light spot flashed by a designation unit in a predetermined cycle are detected by...http://www.google.es/patents/US6229601?utm_source=gb-gplus-sharePatente US6229601 - Coordinate input apparatus and method, and storage medium
Coordinate input apparatus and method, and storage medium
