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:
Mar. 29, 1983
Filed:
Jun. 23, 1980
Yuzo Ono, Tokyo, JP;
Nippon Electric Co., Ltd, Tokyo, JP;
Abstract
A hologram is manufactured by making a plurality of coherent spherical-wave beams, N (.gtoreq.3) in number, interfere with one after another to provide a multiplicity of interference fringe configurations. A phase subtract aspheric-wave is produced by an auxiliary hologram manufactured by the use of two of the spherical-waves. The aspheric-wave is made to interfere with a third spherical-wave or a similar aspheric-wave. Phase distribution .phi..sub.N on the interference fringes is defined by: ##EQU1## where r represents a distance on the hologram between a predetermined point and an optional point, f.sub.k is the distance between the principal surface and the point of convergence or divergence of the particular wave and ##EQU2## is the focal power of the hologram for a coherent beam of the common wavelength. In a laser beam scanner, a coherent beam of a longer wavelength is preferably used in illuminating a hologram, which may or may not be a hologram manufactured as above.