Patent EP0549488A1 successfully refreshed from Google Patents.
EP0549488A1
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EP
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A storage media for an optical information system having an identification code embedded therein
Assignee: Eastman Kodak Co
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Filing: 1992-12-14
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Granted: —
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Expires: 2012-12-14
Abstract
Abstract A optical storage disc for use in an optical storage system includes a storage layer which is capable of being disrupted when a laser beam of sufficient intensity is focused thereon. The optical storage disc has a transparent substrate layer on one side of the storage layer and a lacquer layer on the other side of the storage layer. The disruptions provided by the laser beam are selected to provide human readable and/or machine readable patterns. To reduce the damage to portions of the optical disc other than the storage layer, the storage layer is exposed to the laser beam prior to curing, or prior to applying and curing the lacquer layer. The optical disc can be of the type with data written thereon during fabrication, or the disc can be of the type in which data can be impressed thereon after fabrication of the optical disc. The patterns on the optical disc can be in the form of optical bar codes. In one application of the present invention involving the type of disc on which data can be written after fabrication, the pattern resulting from application of the laser beam to the disc is read by an optical reading device and transferred to the disc in the data format.
Inventors
- 👤 Joseph Paul c/o EASTMAN KODAK COMPANY Lentz
- 👤 Thomas Richard c/o EASTMAN KODAK COMPANY Cushman
- 👤 Patrick Joseph c/o EASTMAN KODAK COMPANY Kline
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 12:53
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/38; G11B19/00; G11B19/02; G11B19/04; G11B20/00; G11B20/00086; G11B20/0021; G11B20/00217; G11B20/00253; G11B20/0026; G11B20/00268; G11B20/00876; G11B20/0092; G11B20/00927; G11B23/28; G11B23/283; G11B23/284; G11B7/00; G11B7/007; G11B7/00736; G11B7/24; G11B7/26
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
85 words
A optical storage disc capable of having identifiable marking stored thereon, said markings resulting from an interaction of a laser beam with said optical storage disc, said optical storage disc comprising: a support substrate layer, said support substrate layer being transparent; a storage layer proximate said support substrate layer and capable of having data stored thereon, said storage layer having a preselected pattern of disruptions in a selected region resulting from irradiation by said laser beam; a protective layer covering said proximate said storage layer.
Claim 2
Dependent Claim
35 words
The optical storage disc of Claim 1 wherein said protective layer is applied prior to fabrication of said preselected pattern of disruptions, said protective layer being cured after fabrication of said preselected pattern of disruptions.
Claim 3
Dependent Claim
25 words
The optical storage disc of Claim 1 wherein said protective layer is applied to said selected region after fabrication of said preselected pattern of disruptions.
Claim 4
Dependent Claim
23 words
The optical storage disc of Claim 3 wherein said pattern of disruptions in said storage layer can be human readable or machine readable.
Claim 5
Dependent Claim
20 words
The optical disc of Claim 3 wherein said pattern of disruptions can be read by an optical bar code reader.
Claim 6
Dependent Claim
34 words
The optical storage disc of Claim 5 wherein said pattern of disruptions is structured such that a position of said optical bar code reader with respect to said field is independent of radial position.
Claim 7
Dependent Claim
48 words
The optical storage disc of Claim 3 wherein said storage disc is selected from the group of optical discs comprised of write-once optical discs, writable optical discs and erasable optical discs data identified by said pattern of disruptions being written on a mirror region of said optical disc.
Claim 8
Dependent Claim
16 words
The optical storage disc of Claim 3 wherein said storage layer includes a dye polymer layer.
Claim 9
Dependent Claim
22 words
The optical storage disc of Claim 1 wherein said pattern of disruptions includes information with respect to the fabrication of said disc.
Claim 10
Independent Claim
57 words
A method of permanently marking an optical storage disc, said method comprising the steps of: assembling an optical disc having a storage layer and a polycarbonate layer; applying a pattern of disruptions on a selected region of said storage layer with a laser beam; and protecting said selected region of said storage layer with a lacquer layer.
Claim 11
Dependent Claim
33 words
The method of Claim 10 wherein said optical disc can be a write-once optical disc or a writable optical disc, a writable optical disc having a recording layer associated with said reflecting layer.
Claim 12
Dependent Claim
35 words
The method of Claim 11 wherein said protecting step includes a step of covering said selected region with a lacquer overcoat prior to said applying step and curing said lacquer overcoat after said applying step.
Claim 13
Dependent Claim
25 words
The method of Claim 11 wherein said protecting step includes a step of covering said selected region with a protective overcoat following said applying step.
Claim 14
Dependent Claim
42 words
The method of Claim 13 further comprising a step of selecting said pattern of disruptions to provide an optical bar code, wherein a thickness of each bar code character is a linear function of distance from a center of said optical disc.
Claim 15
Dependent Claim
53 words
The method of Claim 13 further comprising the steps of: during a write operation for a writable or erasable optical disc, reading by a optical bar code reader said pattern of disruptions, and writing information identified by said optical bar code reader in a data format on said writable or erasable optical disc.
Claim 16
Dependent Claim
64 words
An optical disc of a type having a polycarbonate substrate layer and a storage layer, said storage layer having a pattern of disruptions providing identifying markings, wherein the improvement is characterized by: protecting said pattern of disruptions in a selected region by a protective layer consisting of a material requiring a curing operation, wherein said protective layer is cured after providing said identifying markings.
Claim 17
Dependent Claim
34 words
The optical disc of Claim 16 wherein said protective layer requires a curing operation, said optical disc further characterized by applying said protective layer to said selected region prior to providing said identifying markings.
Claim 18
Dependent Claim
22 words
The optical disc of Claim 16 further characterized by applying said protective overcoat to said selected region after providing said identifying markings.
Claim 19
Dependent Claim
21 words
The optical disc of Claim 18 further characterized by selecting said pattern of disruptions to represent data in bar code format.
Claim 20
Dependent Claim
49 words
The optical disc of Claim 18 wherein said optical storage disc is a writable optical storage disc having a recording layer associated with said storage layer, said optical storage disc further characterized by said data in bar code format replicated on said recording layer in an storage layer format.
Claim 21
Dependent Claim
44 words
The optical storage disc of Claim 18 further characterized by optical bar code characters positioned to be read by scanning the characters during rotation of the disc, said optical bar code characters having an angular width that is a linear function of radial position.
References Cited (Backward Citations)
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