EP0056920A1
Expired / Lapsed
EP
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Optical system for enregistration and restitution from an information carrier comprising two laser sources with different wavelengths
Assignee: Thales SA
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Filing: 1981-12-22
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Granted: —
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Expires: 2001-12-22
Abstract
Abstract System comprising means of transmitting two radiations polarised in the same direction and of different wavelengths lambda 1 and lambda 2). This system also comprises optical means comprising at least one splitter element (20), a quarter wave plate (21) and focusing optics (L3 and L4) making it possible to focus onto two photodetector units (DA and DB) the reading and enregistering components of the composite beam reflected on the information medium (5). <IMAGE>
Inventors
- 👤 Dominique Leterme
- 👤 Jean-Pierre Le Merer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 00:28
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/127; G11B7/1275; G11B7/135; G11B7/1362; G11B7/1365
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References Cited (Backward Citations)
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