Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1997-04-16
1999-04-13
Bennett, G. Bradley
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33390, 356249, G01C 906
Patent
active
058932151
ABSTRACT:
The present invention relates to an inclination sensor capable of detecting inclinations in two X- and Y- axis directions with use of only a single linear sensor. In this inclination sensor, a first optical system collimates the light emitted from a light source, a dark field pattern allows the light from the first optical system to pass therethrough, a half mirror changes the direction of the light which has passed through the dark field pattern, a first liquid member reflects the light which has been changed its direction by the half mirror, a second optical system focuses the light reflected by the first liquid member, the light receiving means receives a light image formed by the second optical system, and the processing means calculates an inclination on the basis of a reception signal provided from the light receiving means. The dark field pattern is constituted by a plurality of slits in such a manner that central lines of the pattern are arranged at equal pitches in one direction and that the pattern width varies in a direction orthogonal to the one direction.
REFERENCES:
patent: 3009255 (1961-11-01), Robillard
patent: 4993162 (1991-02-01), Scholian
patent: 5392112 (1995-02-01), Nakamura
patent: 5513001 (1996-04-01), Ohtomo et al.
patent: 5625955 (1997-05-01), Han
Kumagai Kaoru
Ohtomo Fumio
Bennett G. Bradley
Kabushiki Kaisha Topcon
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