Three dimensional digitizer with electromagnetic coupling
US4613866A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1983 |
| Grant date | Sep 23, 1986 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/37073
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A three dimensional digitizer is provided for determining and digitizing the coordinates of a three dimensional object. A hand-held stylus is used for tracing and determining points of interest on the surface of the object. A plurality of antennas for radiating electromagnetic energy are provided, the antennas being embedded in a table having a work surface upon which the object is placed. The radiating antennas have independent components which define a reference coordinate frame. A transmitter applies electrical signals to the radiating antennas which generate a plurality of distinguishable radio frequency electromagnetic fields. The stylus is provided with a projection for defining a point of contact between the stylus and the surface of the object of interest. A plurality of receiving antennas are disposed in the stylus. The receiving antennas have a known relationship with the projection and the point of contact on the object. The receiving antennas are provided with a plurality of independent components for detecting each of the transmitted electromagnetic fields. The output of the receiving antennas is supplied to an analyzer which converts the components of the electromagne…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.