Transmitter pen location system
US6414673B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1998 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Nov 10, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/043
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transmitter pen location system is provided, in which a pen is adapted to send a repeated output signal to external receivers at two or more receiver locations, wherein the location of the pointing tip of the pen is determined in relation to the writing surface of a whiteboard. In one embodiment an output element, preferably an ultrasonic transducer, transmits a time dependent output signal from a single signal transmitter pen to two or more external receivers at two or more receiver locations. The direction of arrival of the output signal to each of the receiver locations is determined, and the pointing tip of the single transmitter pen is then determined, as the intersection of direction vectors from the pen to the external receivers. In another embodiment, the transducer transmits a time dependent output signal from the transmitter pen to three or more external receivers, wherein the received signal is processed to determine the time of arrival to each of the receivers, and the location of the pointing tip of the pen is determined as the calculated distance between the receivers. In another alternate embodiment having a dual signal transmitter pen, a third receiver located at …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.