Remote indicator for a laser alignment system
US4653910A · kind A · utility
20Cited by
6References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1985 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Oct 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A laser alignment system includes a remote indicator to display the alignment data when the main receiver is out of sight. The remote indicator receives both operating power and alignment data through a connecting cable to the main receiver. A Liquid Crystal Display (LCD) is used in the remote indicator because of its inherently low power consumption. To make the LCD visible under conditions of reduced ambient lighting, a light source illuminates the LCD from behind. A lighting control circuit turns the light source on only when alignment data is present in order to limit battery drain on the main receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.