Target for laser leveling systems

Details Target for laser leveling systems Target for laser leveling systems

1995-08-30

1998-06-02

Dzierzynski, Paul M.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

356138, 356149, G02B 532, G01B 1126, G01C 110

Patent

active

057609322

ABSTRACT:
The invention provides a passive hand held target for use with a scanning light beam, particularly a laser beam, in which the beam impinged upon (i.e. input to) the target is divided and the resultant beams are directed to a viewing screen witha diffusing function, where an observer can discern equality or inequalities of their images as the target is moved to center its input window with respect to the scanning beam. Adjustment of the target then provides a reference for marking of a surface adjacent the target. The beam divider may include a mask which produces a pair of symmetrical easy to compare beam shapes. An alternative beam divider is an axicon. Holograms can be used as equivalent optical devices for the lens and axicon beam dividing function and for the diffusing viewing function, as well as to direct the beams at convenient angles.

REFERENCES:
patent: 3836258 (1974-09-01), Courten et al.
patent: 4365864 (1982-12-01), Cowley et al.
patent: 5016950 (1991-05-01), Smith
patent: 5541727 (1996-07-01), Rando et al.
patent: 5566024 (1996-10-01), Rauch
patent: 5570189 (1996-10-01), Salmon

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