Invention Grant
- Patent Title: Protected optical disc comprising a flexible closure element
- Patent Title (中): 保护光盘包括柔性封闭元件
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Application No.: US474452Application Date: 1983-03-11
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Publication No.: US4551733APublication Date: 1985-11-05
- Inventor: Jean Cornet , Francois Lange , Francois Le Carvennec , Jean-Claude Lehureau , Roger Rascle
- Applicant: Jean Cornet , Francois Lange , Francois Le Carvennec , Jean-Claude Lehureau , Roger Rascle
- Applicant Address: FRX Paris
- Assignee: Thomson CSF
- Current Assignee: Thomson CSF
- Current Assignee Address: FRX Paris
- Priority: FRX8204913 19820323
- Main IPC: B41M5/24
- IPC: B41M5/24 ; G11B7/00 ; G11B7/004 ; G11B7/24 ; G11C13/04 ; G01D15/32
Abstract:
A protected optical disc adapted for optical recording and playback of information (particularly digital recording) with a rigid element carrying the recording surface, and a flexible element permeable to optical radiation, one of these two elements having the shape of a dish. At least one of the elements is provided with a central hole for receiving a driving shaft, with the joined annular portion or portions of the two elements concentric with the central hole.
Public/Granted literature
- US5051186A Method of processing acidic Fe-containing solutions Public/Granted day:1991-09-24
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