Geometrical instruments – Straight-line light ray type
Patent
1996-05-15
1998-02-17
Fulton, Christopher W.
Geometrical instruments
Straight-line light ray type
33282, 33286, 33293, 33DIG21, G01B 1126
Patent
active
057180547
ABSTRACT:
A device for displaying a center position of a laser beam in a vertical-degree measuring system comprises a light receiving device constituted by photosensors and a liquid crystal display panel for displaying a light receiving position. The light receiving device and the liquid crystal display panel are integrally fixed with coordinate axes registered on a vertical line. A center portion of a laser beam is subjected to data processing by an arithmetically processing section from a laser beam receiving position of the light receiving device to display a center point on the liquid crystal display panel. Since the center position displayed on the liquid crystal panel is registered with the center position of the laser beam received by the light receiving device, it is possible to directly access to the display position to utilize it as a reference point for a setting-out.
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patent: 4414749 (1983-11-01), Johannsmeier
patent: 4747454 (1988-05-01), Perryman
patent: 5189484 (1993-02-01), Koschmann et al.
patent: 5606802 (1997-03-01), Ogawa
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