Polar co-ordinate digitizer
US5004870A · kind A · utility
8Cited by
2References
7Claims
0Family size
Inventor
Key dates
| Filing date | Apr 11, 1990 |
| Grant date | Apr 2, 1991 |
| Priority date | — |
| Expiry date | Apr 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved polar co-ordinate digitizer where a cord is extensible from a base unit and moves a cord guide to provide an angle measurement and is also wrapped on a drum whose movement reflects a length measurement. The winding drum is mounted on a common center or shaft with the angle arm on which the cord guide is located. Both rotate separate disks which have their peripheries a bar-code pattern. These are above the drum and cord guide so as to allow unrestricted angular movement of the cord. Light-emitting diode and photo detector means sense the bar-patterns to provide length and angle parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.