Optical: systems and elements – Diffraction – From grating
Patent
1997-01-16
1998-07-21
Phan, James
Optical: systems and elements
Diffraction
From grating
359569, 359 2, G02B 518, G03H 100
Patent
active
057842000
ABSTRACT:
A hologram seal for security is prepared in pseudo manner by using a diffraction grating pattern. A picture data of a plurality of motifs is inputted to a computer. Within the computer, there are prepared in advance plural kinds of pixel patterns in which grating lines are arranged within one pixel at a predetermined line width, a pitch and an arrangement angle. These pixel patterns are arranged in a matrix form like tiles by making reference to the inputted picture data to represent respective motifs. The picture data in which the motifs are represented is given to an electron beam picture drawing apparatus to prepare a diffraction grating original block. This original block is used to mass-produce pseudo hologram seals by press device. By varying an arrangement angle of grating lines, it is possible to carry out gradation representation, or to record a plurality of motifs in an overlapping manner.
REFERENCES:
patent: 4568141 (1986-02-01), Antes
patent: 4604329 (1986-08-01), Reber
patent: 5032003 (1991-07-01), Antes
patent: 5301062 (1994-04-01), Takahashi et al.
patent: 5335113 (1994-08-01), Jackson et al.
Chang Audrey
Dai Nippon Printing Co. Ltd.
Phan James
LandOfFree
Difraction grating recording medium, and method and apparatus fo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Difraction grating recording medium, and method and apparatus fo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Difraction grating recording medium, and method and apparatus fo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1652258