Optical card with printing visible below the optical recording
First Claim
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1. An optical card to record and reproduce optical data, comprising:
- a base layer having means for holding printed data; and
a substantially transparent recording layer having means for storing optical data, formed on said base layer, said means for storing optical data comprising a plurality of pits formed in said recording layer for diffraction of a light beam.
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Abstract
An optical card having visible data marked on a base layer and a substantially transparent optical data recording layer formed over the base layer. A protective layer is laminated over the optical data recording layer. The visible data marked on the base may be marked in an ink visible only at a nonvisual wavelength, such as infrared. A reader scans the visible data marked on the base layer, since the optical recording layer covering the base layer is substantially transparent.
79 Citations
5 Claims
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1. An optical card to record and reproduce optical data, comprising:
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a base layer having means for holding printed data; and a substantially transparent recording layer having means for storing optical data, formed on said base layer, said means for storing optical data comprising a plurality of pits formed in said recording layer for diffraction of a light beam. - View Dependent Claims (2)
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3. An optical card to record and reproduce optical data claimed 2, wherein said printed data is marked by an ink having a reflectivity virtually identical to a reflectivity of said light-absorbing layer in a visible wavelength light, and wherein said ink has reflective characteristics differing from the reflectivity of said light-absorbing layer in an invisible wavelength light, so that said printed data can be detected by a light within said invisible wavelength.
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4. An optical card to record and reproduce optical data claimed 1, wherein said printed data is visible.
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5. An optical card system comprising:
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an optical card including; a base layer having means for holding printed data; a substantially transparent recording layer having means for storing optical data, formed on said base layer, said means for storing optical data comprising a plurality of pits formed in said recording layer for diffraction of a light beam; and an optical card reader, having means for scanning said printed data and generating a binary data corresponding thereto.
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Specification