US4564932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabrication of a protected optical disk and a disk obtained by said method
Assignee: Thales SA
•
Filing: 1983-04-26
•
Granted: 1986-01-14
•
Expires: 2003-04-26
Abstract
Abstract A protected optical disk for recording information is fabricated by a method whereby at least one cover is rigidly fixed by a welding to an optical disk having at least one layer of recording material which can be both written and read optically. At least two joints are thus formed by welding, each joint being constituted by at least two weld zones each located respectively within a concentric ring.
Inventors
- 👤 Francois Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; B; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C65/78; B29C65/7802; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/302; B29C66/3022; B29C66/30221; B29C66/30223; B29C66/3024; B29C66/40; B29C66/41; B29C66/43; B29C66/45; B29C66/452; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; G11B7/24015; G11B7/24018; G11B7/24021; B29C65/04; B29C65/06; B29C65/0672; B29C65/14; B29C65/16; B29C65/18; B29C65/20; B29C66/50; B29C66/51; B29C66/54; B29C66/71; B29K; B29K2033/00; B29K2033/04; B29K2033/12; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
A protected optical disk comprising a protective casing of thermoplastic material, annular optically recordable structure enclosed in said casing; said casing being made of at least first and a second disk shaped member delimiting an annular chamber and assembled to each other with welded circular joints; said first disk shaped member having an annular recess in confronting relationship with said recordable structure and two ring shaped raised portions respectively inwardly and outwardly bounding said annular recess; said second disk shaped member mating said raised portions; said welded circular joints extending between said second disk shaped member and said ring shaped raised portions for sealing said casing; at least first and second of said welded circular joints being spaced and concentrically arranged on one side of the inner and outer sides of said annular recess; one of said disk shaped members having an inner flat face supporting said recordable structure; the radial spacing of said first and second welded circular joints lying in a range from 0.4 to 6 millimeters.
Claim 2
Dependent Claim
169 words
A protected optical disk comprising a protective casing of thermoplastic material, annular optically recordable structure enclosed in said casing; said casing being made of at least first and a second disk shaped member delimiting an annular chamber and assembled to each other with welded circular joints; said first disk shaped member having an annular recess in confronting relationship with said recordable structure and two ring shaped raised portions respectively inwardly and outwardly bounding said annular recess; said second disk shaped member mating said raised portions; said welded circular joints extending between said second disk shaped member and said ring shaped raised portions for sealing said casing; at least first and second of said welded circular joints being spaced and concentrically arranged on one side of the inner and outer sides of said annular recess; one of said disk shaped members having an inner flat face supporting said recordable structure; the radial spacing of said first and second welded circular joints lying in a range from 0.4 to 6 millimeters.
Claim 3
Dependent Claim
24 words
A disk as in claim 1 wherein three welded circular joints are spaced and concentrically arranged on said one side of said annular recess.
Claim 4
Dependent Claim
26 words
A disk as in claim 1 wherein said second disk shaped member has raised portions mating with said raised portions of said first disk shaped member.
Claim 5
Dependent Claim
15 words
A disk as in claim 1 wherein said raised portions are formed by spacer rings.
Claim 6
Dependent Claim
18 words
A disk as in claim 1 wherein said first and second welded circular joints extend alternately in sectors.
Claim 7
Dependent Claim
41 words
A disk as in claim 1, wherein a further annular optically recordable structure is enclosed in said casing; said recordable structure and said further recordable structure being respectively supported by inner flat faces of said first and second disk shaped members.
Claim 8
Dependent Claim
19 words
A disk as in claim 1, wherein said first and second disk shaped members are fabricated from polymethyl methacrylate.
Claim 9
Dependent Claim
22 words
A disk as in claim 1, wherein at least one of said disk shaped members is made of a transparent themoplastic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |