Patent US1255464A successfully refreshed from Google Patents.
EP0241372A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical reading device for an optical-recording medium
Assignee: Vantiva SA
•
Filing: 1987-04-07
•
Granted: —
•
Expires: 2007-04-07
Abstract
Abstract A device for optically reading a recording medium is provided, in which a polarization beam separator includes a transparent plate having a phase network associated with a birefringent material, the refraction index of this material having a first refraction index for the polarization of an incident beam and a second refraction index for the polarization of a reflected beam. Thus, in accordance with the embodiment, the detection devices are placed substantially along the emission axis of the optical source.
Inventors
- 👤 Jean-Claude Lehureau
- 👤 Bruno Mourey
- 👤 Henriette Magna
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:02
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1365; G02; G02B; G02B5/00; G02B5/18; G02B5/1833; G02B27/00; G02B27/28; G02B27/283; G02B5/30; G02B5/3083; G11B7/08; G11B7/09; G11B7/0908; G11B7/0909; G11B7/123; G11B7/1353; G11B7/1381
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.