Patent US6427075B1 successfully refreshed from Google Patents.
US4954380A
Expired / Lapsed
US
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Optical recording medium and process for production thereof
Assignee: Canon Inc
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Filing: 1988-11-28
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Granted: 1990-09-04
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Expires: 2008-11-28
Abstract
Abstract An optical recording medium comprises an optical recording layer on a transparent substrate. The optical recording layer is then selectively irradiated with an energy beam to form therein a tracking region for guiding a laser beam for recording and reproduction. The tracking region is free of unevenness and has an optical characteristic different from that of the portion of the optical recording constituting a data recording region which has not been irradiated with the laser beam.
Inventors
- 👤 Osamu Kanome
- 👤 Takayoshi Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/002; G11B7/0033; G11B7/007; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
60 words
An optical recording medium, comprising a transparent substrate and an optical recording layer disposed on the substrate, wherein said optical recording layer comprises a data recording region and a tracking region having an optic la characteristic different from that of the data recording region for guiding a laser beam for recording and reproduction, said tracking region being free of unevenness.
Claim 2
Dependent Claim
60 words
An optical recording medium, comprising a transparent substrate and an optical recording layer disposed on the substrate, wherein said optical recording layer comprises a data recording region and a tracking region having an optic la characteristic different from that of the data recording region for guiding a laser beam for recording and reproduction, said tracking region being free of unevenness.
Claim 3
Dependent Claim
18 words
A medium according to claim 1, wherein said optical recording layer comprises a film comprising an organic dye.
Claim 4
Dependent Claim
14 words
A medium according to claim 2, wherein the organic dye is a polymethine dye.
Claim 5
Dependent Claim
29 words
A medium according to claim 1, wherein said tracking region shows a reflectivity with respect to a near-infrared wavelength which is higher than that of the data recording region.
Claim 6
Dependent Claim
13 words
A medium according to claim 1, wherein the tracking region has been bleached.
Claim 7
Dependent Claim
90 words
A process for producing an optical recording medium, which comprises the steps of forming an optical recording layer on a transparent substrate, and selectively irradiating the optical recording layer with an energy beam sufficient to form in the optical recording layer a tracking region for guiding a laser beam for recording and reproduction, but insufficient to deform said optical recording layer, said tracking region being free of unevenness and has an optical characteristic different from that of the portion of the optical recording layer not irradiated with the energy beam.
Claim 8
Dependent Claim
90 words
A process for producing an optical recording medium, which comprises the steps of forming an optical recording layer on a transparent substrate, and selectively irradiating the optical recording layer with an energy beam sufficient to form in the optical recording layer a tracking region for guiding a laser beam for recording and reproduction, but insufficient to deform said optical recording layer, said tracking region being free of unevenness and has an optical characteristic different from that of the portion of the optical recording layer not irradiated with the energy beam.
Claim 9
Dependent Claim
20 words
A process according to claim 6, wherein the optical recording layer is irradiated with the energy beam through a mask.
Claim 10
Dependent Claim
21 words
A process according to claim 6, wherein said energy beam is a light having a wavelength of 800 nm or below.
Claim 11
Dependent Claim
28 words
A process according to claim 6, wherein said energy beam has an intensity of 10 mW.h/cm 2 -150 mW.h/cm 2 at the surface of the optical recording layer.
Claim 12
Dependent Claim
28 words
A process according to claim 9, wherein said energy beam has an intensity of 25 mW.h/cm 2 -85 mW.h/cm 2 at the surface of the optical recording layer.
Claim 13
Dependent Claim
15 words
A process according to claim 6, wherein said optical recording layer comprises an organic dye.
Claim 14
Dependent Claim
14 words
A process according to Claim 11, wherein the organic dye is a polymethine dye.
Claim 15
Dependent Claim
27 words
A process according to claim 6, wherein said selective irradiating step comprises the step of irradiating the optical recording layer with the energy beam through a filter.
Claim 16
Dependent Claim
28 words
A process according to claim 6, wherein said selective irradiating step comprises the step of irradiating the optical recording layer with the energy beam through a cold mirror.
Claim 17
Dependent Claim
25 words
A process according to claim 6, wherein said forming step comprises the step of forming the optical recording layer by coating on the transparent substrate.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |