Laser beam projection survey apparatus with automatic grade corr

Details Laser beam projection survey apparatus with automatic grade corr Laser beam projection survey apparatus with automatic grade corr

1998-08-24

1999-08-03

O'Shea, Sandra

Horology: time measuring systems or devices

Signalling means

Repeat

3561391, 33276, 33279, F21V 2900

Patent

active

059333936

ABSTRACT:
A laser beam projection apparatus includes a light source, a vessel containing a transparent liquid which transmits a light beam from the light source and has a free liquid surface, a condensing optical member for condensing the light beam transmitted through the vessel and the liquid to form a secondary source of the light source, and a first optical member for collimating the light beam from the secondary source into a parallel beam. The focal lengths of the condensing optical member and the first optical member are set in accordance with the refractive index of the liquid. Preferably, the focal lengths are set in accordance with the refractive index of the liquid such that the parallel beam from the first optical member emerges in the vertical direction.

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