The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1998
Filed:
Aug. 30, 1995
Robert M Perchak, Dayton, OH (US);
Other;
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.