Optical card
US5111033A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2033/30
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
In an optical card, a card substrate has its rigidity which is sufficient to handle the card substrate independently. The card substrate has a first side which serves as a reading side upon which reading light is incident. An optical-data recording section includes a light-reflective pattern. The optical-data recording section is arranged on one of the first and second sides of the card substrate. Optical data incident upon the optical-data recording section toward the reading side of the card substrate is recorded by the optical-data recording section. A shielding layer is arranged on one of the first and second sides of the card substrate, for shielding the optical-data recording section from a viewer's field of view. The shielding layer has its transmission characteristic with respect to the reading light, which is sufficient to shield light within a visual range and to enable reading of the optical-data recording section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.