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:
Jun. 09, 1981
Filed:
Aug. 09, 1978
Kiyofumi Matsuda, Musashi-Murayama, JP;
Agency of Industrial Science and Technology, Tokyo, JP;
Ministry of International Trade & Industry, Tokyo, JP;
Abstract
A transparent object can be converted into a visible image which is made up of a contrasted image of light and shade and therefore is readily perceivable with a three-dimensional illusion sensation by a method which comprises forming holograms with each of two collimated beams having slightly different angles of incidence and one reference beam, causing the reference beam to impinge upon the first hologram and thereby reproducing first order diffraction beams equivalent to the two collimated beams, then causing the reproduced diffraction beams to be passed through or reflected by the transparent object so as to impinge upon the second hologram and thereby reproducing diffraction beams laterally sheared and equivalent to the reference beam by which the second hologram was formed and imparting a suitable phase difference to these reproduced diffraction beams and thereby causing the beams to interfere with each other, whereby the phenomenon of interference thus produced on the surface of the object image gives rise to the visible image for desired observation.