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:
Nov. 08, 1977
Filed:
Nov. 21, 1975
Juris Upatnieks, Ann Arbor, MI (US);
Environmental Research Institute of Michigan, Ann Arbor, MI (US);
Abstract
A projector for casting the image of a section of an object recorded on a hologram includes a laser for illuminating a section of the hologram and a lens for focusing a section of the reconstructed virtual image on a screen. The hologram is formed as a cylindrical section surrounding the object, on film, and is stored on a pair of parallel spools. A coherent light beam illuminates a section of the hologram arrayed between the spools and an adjustment mechanism which moves an optical element in the reconstructing beam path and the projecting lens allows adjustment of the illuminated section along an axis parallel to the spools. The projecting lens assembly has an adjustable focal length allowing it to project images at varying depths of the resultant virtual image. The projected image of a section of the object may be changed by rotating the reels to give the effect of viewing the object from differing angles or changing the height of the illuminated section to give the illusion of viewing the object from different heights.