Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1986-05-02
1987-08-04
Schilling, Richard L.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
101211, 101426, 283 91, 283 93, 430 10, 430 22, 430320, B42D 1500, G03F 500, G03F 900
Patent
active
046845933
ABSTRACT:
A secure and self-verifiable image is formed by an array of image dots 30 on one side of a pellucid stratum or film 10 and a corresponding array of light-transmitting apertures 21 in a dark screen 20 on the other side of film 10, with image dots 30 being offset from the axes of apertures 21 so that the image is viewable only by light passing obliquely through film 10 at an angle that intersects arrayed apertures 21 and dots 30. Both apertures 21 and dots 30 occupy up to about 15% of the total area and the array spacing is at least 40 dots per centimeter. The reflective density of the interaperture regions of dark screen 20 is at least 1.6, and pellucid film 10 is at least 0.05 mm thick.
REFERENCES:
patent: 3640009 (1972-02-01), Kamiyama et al.
patent: 3675948 (1972-07-01), Wicker
patent: 4143967 (1979-03-01), Wicker
patent: 4389063 (1983-06-01), Ryan
Schilling Richard L.
Secure Images Inc.
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