| 摘要 |
A process for encoding data and apparatus for recording and retrieving the same. The encoding is accomplished by depositing, on an area for each datum of said data, a first plurality of binarily-weighted ink components, whose presence or absence defines the significant value of a digit, and a second plurality of binarily-weighted ink components, whose presence or absence defines the order of the digit. The inks used photoluminesce in distinct narrow wavebands when subjected to ultraviolet radiation. The apparatus for retrieving the data includes a source of ultraviolet radiation for periodically illuminating a scanning zone to where the data to be read is moved. A scanning device is used to scan the scanning zone during the period when the ultraviolet radiation is on, so as to detect the fluoresence of those ink components which are present. Each datum may also be so shaped as to be human-readable. An optical system is used to direct the detected fluoresence to an array of light-responsive members. Each member of the array is responsive to the fluorescence of only one ink component, thereby registering the presence or absence of that particular ink component in the data. Successive passes by the scanning device repeatedly scan the data, which may be randomly oriented relative to the scanning zone. Conventional logic circuitry may be used to interpret the output of the array of light-responsive members.
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