EP0329122A2
Expired / Lapsed
EP
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Method for affixing information on read-only optical disks
Assignee: Koninklijke Philips NV
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Filing: 1989-02-16
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Granted: —
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Expires: 2009-02-16
Abstract
Abstract A read-only optical recording disc comprising a substrate (11), a metal reflective layer (13) and an overlying protective layer (15), at least one of the substrate and the protective layer being light-transmissive, is marked by means of a pulsed scanning laser beam which transmits light in a patterned array through a transparent layer of the medium and indelibly marks the reflective layer of the medium without disrupting the surface continuity of the substrate and protective layer.
Inventors
- 👤 Denney Lee Wilson
- 👤 Geoffrey Alan Rhine
- 👤 Thomas Lee Elmquist
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 04:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/241; G11B7/252; G11B7/258; G11B7/2585; G11B23/00; G11B23/38; G11B23/40; G11B7/004; G11B7/0045; G11B7/00451; G11B7/007; G11B7/00736; G11B7/253; G11B7/2533; G11B7/2534; G11B7/254; G11B7/2542
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
A method for affixing an internal pattern of visible information upon the non-information areas of a read-only optical disc where the disc structure is comprised of (a) a continuous substrate layer, (b) a substantially continuous layer of reflective metal, and (c) an overlying continuous polymeric protective layer, at least one of (a) and (c) being substantially light-transmissive, which comprises passing a patterned sequence of pulsed laser light through a transparent layer at a power level sufficient to form a series of holes in the underlying reflective metal layer corresponding to the information pattern without disrupting the surface continuity of either of layers (a) and (c).
Claim 2
Independent Claim
105 words
A method for affixing an internal pattern of visible information upon the non-information areas of a read-only optical disc where the disc structure is comprised of (a) a continuous substrate layer, (b) a substantially continuous layer of reflective metal, and (c) an overlying continuous polymeric protective layer, at least one of (a) and (c) being substantially light-transmissive, which comprises passing a patterned sequence of pulsed laser light through a transparent layer at a power level sufficient to form a series of holes in the underlying reflective metal layer corresponding to the information pattern without disrupting the surface continuity of either of layers (a) and (c).
Claim 3
Dependent Claim
28 words
The method of claim 1 in which both of layers (a) and (c) are light-transmissive and the disc is transparent through its entire thickness in the pattern areas.
Claim 4
Dependent Claim
30 words
The method of claim 2 in which the protective layer is thinner than the substrate layer and the patterned sequence of pulsed laser light is passed through the protective layer.
Claim 5
Independent Claim
14 words
The method of claims 1-3 in which the substrate layer is a polycarbonate resin.
Claim 6
Independent Claim
12 words
The method of claims 1-3 in which the protective layer is nitrocellulose.
Claim 7
Independent Claim
13 words
The method of claims 1-3 in which the reflective metal layer is aluminum.
References Cited (Backward Citations)
No citation records indexed.
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