Laser locus ball apparatus for a wireless keyboard
US7378990B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2006 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Oct 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0317
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A laser locus ball apparatus for a wireless keyboard includes a base, a laser source generator, a locus ball, a light sensing element and a key cover. The base provides a lateral plate with a locating hole to locate the laser source generator and has another two opposite lateral plates with an engaging wedge at the bottom edge thereof to engage with the key cover. The top plate of the base has a supporting bore to receive the locus ball. A containing space is formed in the base to accommodate the optical sensing element. The laser source generator emits laser to the lower surface of the locus ball. The locus ball is movably received in and supported with the supporting bore such that the lower surface thereof extending downward from the supporting bore to reflect interference stripe figure during the lower surface of the locus ball receiving the laser. The light sensing element senses the laser interference stripe figure within every preset unit time. The key cover provides a circular hole at the top thereof for an upper surface of the locus ball extending outward the circular hole. Once the laser locus ball apparatus is in operation and the locus ball is moved, the moving directio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.