Data reading and/or writing apparatus of type using optical card
US5179267A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Nov 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for reading and writing a data signal from and on an optical card including an optical head having a semiconductor laser for emitting a writing light beam, a light emitting diode for emitting a reading light beam, a first object lens for projecting the reading light spots onto the optical card, a second objective lens for projecting the reading light beam reflected by the optical beam onto a photodetector and a half mirror arranged in an optical axis of the second objective lens, a driving mechanism for moving the optical card in it lengthwise direction, and a focusing control mechanism for moving the optical head in a direction normal to the surface of the optical card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.