Tilt angle automatic compensator in all directions
US5513001A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Jul 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/64
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tilt angle automatic compensator used for a device requiring verticality or horizontality is disclosed. The automatic compensator comprises a container 4 where a transparent liquid to form free liquid surface 1 is sealed, a light projection system for projecting light beam toward the free liquid surface at a predetermined angle so that it is totally reflected on the free liquid surface, and an optical system arranged at a predetermined position along optical path of the totally reflected light beam after passing through the container with sealed liquid and for equalizing change of reflection angle of optical axis corresponding to change of incident angle of optical axis in all directions. When the liquid container is tilted and incident angle of the light beam is relatively changed with respect to the free liquid surface, sensitivity varying according to the direction of change of reflection angle is optically compensated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.