发明名称 |
Method and apparatus for coding heat sensitive media |
摘要 |
A method of coding an optically-readable medium comprises: applying to the medium at least one coating of a heat-sensitive material to produce a specified combination of at least two optical changes as a function of time when heated to a predetermined temperature above ambient; heating the medium to the predetermined temperature; and sensing the optical changes undergone by the medium to determine whether the sensed changes match the specified combination. The method and apparatus are described particularly to an optically-readable medium wherein the heat-sensitive coating is in a plurality of windows formed in the medium, each window signifying a value element.
|
申请公布号 |
US4958065(A) |
申请公布日期 |
1990.09.18 |
申请号 |
US19880227468 |
申请日期 |
1988.08.01 |
申请人 |
PREPAID CARD SERVICES, INC. |
发明人 |
WEINBERGER, ZVI |
分类号 |
B41M5/26;B41M5/28;B41M5/30;G06K1/12;G06K19/14;G07F7/02;G07F7/08 |
主分类号 |
B41M5/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|