Method of reading pattern and optical signal reader
First Claim
Patent Images
1. A method of reading a pattern, comprising the steps of:
- heating a substrate on which an invisible pattern is formed, said pattern containing a polymer selected from a group consisting of polyacrylonitrile and an acrylonitrile-based copolymer; and
detecting infrared light radiated from said pattern.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of reading a pattern including steps of heating or irradiating with infrared light a substrate on which a transparent pattern is formed, the pattern containing a material capable of absorbing infrared light of specific wavelength such as polyacrylonitrile, and detecting infrared light which is radiated or reflected from the pattern.
-
Citations
10 Claims
-
1. A method of reading a pattern, comprising the steps of:
-
heating a substrate on which an invisible pattern is formed, said pattern containing a polymer selected from a group consisting of polyacrylonitrile and an acrylonitrile-based copolymer; and detecting infrared light radiated from said pattern. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of preventing counterfeiting of a prepaid card in which magnetic information is recorded comprising the steps of:
-
forming a plurality of invisible patterns corresponding to remaining sums on said prepaid card; punching a hole in one of said patterns corresponding to a remaining sum available for use at the time when said prepaid card is used; heating a region of said patterns on said prepaid card; detecting infrared light radiated from said patterns; and comparing information detected from said patterns with the magnetic information recorded in said prepaid card.
-
-
7. An optical signal reader, comprising:
-
a means for conveying a substrate on which an invisible pattern is formed, said pattern containing a material capable of radiating infrared light of specific wavelength by heating; a means for heating a region of said pattern formed on said substrate; and a means for detecting infrared light with a wavelength region of 3 to 5.3 μ
m radiated from said pattern. - View Dependent Claims (8, 9, 10)
-
Specification