Presentation board digitizers
US6724371B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2001 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Dec 18, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A handheld device (200) includes a housing (202) having a cylindrical bore (204) therein and which terminates at a distal end (206) of the housing with a central orifice communicating therewith. The housing serves for receiving a portion of a body of a drawing implement with its drawing tip extending from the central orifice. The device (200) further includes an ultrasonic receiver or transmitter (220) mounted within the housing, remote from the drawing tip, yet in close proximity with the bore. This device serves for receiving or transmitting an intermittent ultrasound signal through the bore and the plurality of openings, thereby enabling triangulation of the drawing tip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.