Optical: systems and elements – Single channel simultaneously to or from plural channels
Reexamination Certificate
2000-05-16
2003-04-01
Mai, Huy (Department: 2873)
Optical: systems and elements
Single channel simultaneously to or from plural channels
C359S629000, C356S138000
Reexamination Certificate
active
06542304
ABSTRACT:
Reference is made to U.S. Pat. No. 5,680,208, issued Oct. 21, 1997, entitled GRAVITY ORIENTED LASER SCANNER, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
In many instances it is desired to establish reference lines. This is particularly useful for construction, grading, and “do it yourself” activities. Traditional tools for these tasks include straight edges, rulers, protractors, squares, levels, and plumb bobs. More modern tools include laser alignment devices.
Laser alignment devices include simple pointers, pointers with a bubble vial, self-leveling pointers, multiple beam pointers, and devices that produce a sheet of light. It is highly desirable to have multiple beams that are mutually orthogonal. This is typically achieved by several partially silvered mirrors at 45 degrees to the laser beam. This method requires placing the mirrors in precise alignment and securing them with glue. Further, the mirrors should be extremely stable over time and temperature. More beams require more mirrors at added expense and complexity.
SUMMARY OF THE INVENTION
The present invention relates to improvements to this field rendering simpler, more stable and cost effective laser devices which can generate one or more laser beams for measuring, aligning, leveling and other purposes.
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Butler Andrew G.
Carlsen, Jr. William F.
Duval Eugene F.
Tacklind Christopher A.
Zimmerman Thomas
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