Keyboard having infrared position detection apparatus and input method using same
US8982054B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | Oct 30, 2012 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | May 1, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0423
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A keyboard includes an input interface, a rotatable infrared emitter, a first counter, a second counter, an infrared receiver, and a processor. The rotatable infrared emitter emits infrared light across the input interface which represents a keyboard. The first counter starts a count at each beginning of the infrared light emission. The second counter starts a count when the infrared emitter rotates to reach a reference direction in each rotating period. The infrared receiver stops the counts of the first counter and the second counter when the infrared receiver receives infrared light reflected from an obstacle. The first counter defines a transmission time of the infrared light. The second counter defines a rotating time. The processor calculates a position of the obstacle on the input interface according to the transmission time, the rotating time, a rotating speed of the infrared emitter, and positions of the infrared emitter and infrared receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.