Target for laser leveling systems

Abstract

A number of embodiments of targets, for use with scanning light beam leveling/marking devices, are constructed with their elements incorporated as target structure. The lens and beam divider functions are formed into optical quality parts such as a polycarbonate block, these parts thus are made essentially as an integral element, or the function of those elements can be provided by a first hologram which is optically equivalent of the input lens and beam dividing axicon, and the viewing screen diffuser function provided by a second hologram, and these holograms may be made on a single substrate, to improve and maintain alignment. The optical path for the impinging light beam (after it is divided) may be transmitted and reflected from the input to the view window through one or more reflector surfaces, with the body of the target functioning as a waveguide. Utilizing such integral constructions, and using input and output holograms, provides advantages of minimized space for the optical elements, and built-in permanent alignment of these elements. They also are small in size, sturdy, have no external protuberances, and will withstand rough handling in a construction environment.

Dependencies are inferred from the claim text.