DIGITAL PEN SYSTEM, TRANSMITTER DEVICES, RECEIVING DEVICES, AND METHODS OF MANUFACTURING AND USING THE SAME

摘要

A system (5) for tracking the position of a digital (100) pen including a (i) pen-fixed ultrasound device (210) (i.e. transmitter or receiver) and (ii) a plurality of writing-surface fixed ultrasound devices (150) (i.e. transmitters or receivers) is disclosed. In some embodiments, a measurement is made of the time that it takes for ultra-sound to travel between the pen-fixed ultrasound device (210) and the writing-surface fixed ultrasound devices (150) via a path that includes a writing surface sub-path (170) between the 'given point' (175) on the writing surface and the writing-surface fixed ultrasound devices (150). In some embodiments, the position of the digital pen (100) or a component thereof (for example, pen-fixed ultrasound device (210)) may be determined in accordance with (i) the aforementioned measured times of ultra-sound travel; and (ii) the speed of sound within the writing surface (140). Related methods for tracking the position of the digital pen (100) are disclosed. Related methods for manufacturing any presently-disclosed system are also provided. Furthermore, apparatus and methods for transmitting ultra-sound from a pen-fixed ultrasound transmitter (210), and for detecting ultra-sound that propagates in a board or writing surface (140) are disclosed.