EP0560318A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical card and device to read same
Assignee: Omron Corp
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Filing: 1993-03-10
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Granted: —
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Expires: 2013-03-10
Abstract
Abstract An optical card (1) having visible data (9) marked on a base layer (2) and a substantially transparent optical data recording layer (5) formed over the base layer (2). A protective layer (8) is laminated over the optical data recording layer (5). The visible data (9) marked on the base (2) 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.
Inventors
- 👤 Kazuo Tsuboi
- 👤 Koji Iguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 09:57
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/06; G06K19/06009; G06K19/06046; G06K19/08; G06K19/10; G06K19/14; G11; G11B; G11B7/00; G11B7/002; G11B7/0033; G11B7/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
An optical card to record and reproduce optical data, comprising: a base layer (2; 51) having means (4) for holding printed data (9; 92, 93); and a substantially transparent recording layer (5; 72) having means for storing optical data, formed on top of said base layer (2; 51).
Claim 2
Dependent Claim
39 words
An optical card according to claim 1, wherein said means for holding printed data (9; 92, 93) comprises a light-absorbing layer (4) coated on said base layer (2; 51), on which said printed data (9; 92, 93) is marked.
Claim 3
Dependent Claim
18 words
An optical card according to claim 1 or 2, wherein said printed data (9; 92, 93) is visible.
Claim 4
Dependent Claim
80 words
An optical card according to claim 1 or 2, wherein said printed data (9; 92, 93) is marked by an invisible ink having a reflectivity virtually identical to a reflectivity of said light-absorbing layer (4) in a visible wavelength light, and wherein said invisible ink has reflective characteristics differing from the reflectivity of said light-absorbing layer (4) in an invisible wavelength light, so that said printed data (9; 92, 93) can be detected by a light within said invisible wavelength.
Claim 5
Dependent Claim
76 words
An optical card system comprising: an optical card (1; 82) including - a base layer (2; 51) having means for holding printed data (9; 92, 93); and - a substantially transparent recording layer (5; 72), having means for storing optical data, formed on top of said base layer (2; 51); and an optical card reader (21; 41), having - means (22) for scanning said printed data (9; 92, 93) and generating a binary data corresponding thereof.
References Cited (Backward Citations)
No citation records indexed.
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