Geometrical instruments – Straight-line light ray type – Level
Patent
1990-01-04
1991-02-19
Haroian, Harry N.
Geometrical instruments
Straight-line light ray type
Level
356250, 33DIG21, G01B 1126
Patent
active
049931610
ABSTRACT:
The laser beam level instrument includes a laser diode mounted on a pendulous platform suspended from a frame by gold plated Mylar strips which also serve as conductors for supplying power to the diode. The strips are mounted with a 180 degree twist to overcome resistance to flexing/bending so that the platform moves freely under the influence of gravity to provide automatic self-leveling. The diode operates on low d.c. voltage but if d.c. is applied to the strips the magnetic field around the Mylar strips will have sufficient force relative to the geomagnetic field to interfere with free pendulation. So 4.5 volts d.c. is stepped up and inverted to about 20 volts a.c. to avoid interference with the geomagnetic field and to reduce power loss across the gold plated strips. The a.c. voltage is then stepped down and converted back to d.c. voltage (2-3 volts) on the platform to power the diode. A vertical laser beam emitted from the diode is adjusted by an optical flat and collimated by an adjustable focal length lens which is adjusted to account for the manufacturing variances in the length of the strips. The vertical beam is then deflected 90 degrees by a prism, and rotated through a horizontal plane to provide a precise leveling reference.
REFERENCES:
patent: 3771876 (1973-11-01), Ljungdahl
patent: 4183667 (1980-01-01), Denton
patent: 4221483 (1980-09-01), Rando
patent: 4781457 (1988-11-01), Hirano et al.
David White, Inc.
Haroian Harry N.
Michael Bayard H.
LandOfFree
Laser beam level instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser beam level instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser beam level instrument will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1133298