Secure and self-verifiable image

Details Secure and self-verifiable image Secure and self-verifiable image

1984-05-08

1986-12-30

Bell, Paul A.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283904, 283 93, 355 77, 430354, B42D 1500

Patent

active

046324305

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), Komiyama
patent: 3675948 (1972-07-01), Wicker
patent: 4143967 (1979-03-01), Wicker
patent: 4389063 (1983-06-01), Ryan

Affiliated with

Also associated with

Rating

Secure and self-verifiable image does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Secure and self-verifiable image, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Secure and self-verifiable image will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1543332