Acoustic contact sensor for handwritten computer input
US4845684A · kind A · utility
17Cited by
9References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1986 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Dec 9, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/907
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An acoustic contact sensor for handwritten computer input is disclosed herein. The contact sensor comprises ultrasonic sending transducer means, receiving transducer means and circuit means for providing a logic signal to a computer when contact is made. The sending and receiver transducer means can either individually be coupled to a pen stylus or writing and/or display surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.