System and method for operating groups of lasers to project a visible line of demarcation within discrete regions of an athletic field
US6751880B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2003 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Mar 10, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63C2203/24
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The surface of an athletic field is divided into multiple regions or zones. A first of these zones is served by a first group of laser sources. A second of the zones is served by a second group of laser sources. Each group includes at least two lasers arranged to project visible light onto the field from opposite lateral sides of the field. The output from each group is focused onto the field so as to form a composite line across the field—anywhere within the associated zone. A controller is operative, in response to receipt of a command from either a keyboard terminal or a wireless, hand held user interface device, to select one of the first group of laser sources and the second group of laser sources to project a composite temporary visible line. The zones may be contiguous or may be separated by one or more intermediate zones, with each intermediate zone having its own associated group of laser sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.