EP0136041A1
Expired / Lapsed
EP
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Optical memory disc
Assignee: Sharp Corp
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Filing: 1984-08-17
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Granted: —
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Expires: 2004-08-17
Abstract
Abstract A recording medium is disposed on a glass substrate having concentric guide grooves. A centering device is secured to the glass substrate at the center of the guide grooves. In a preferred form, photopolymer is disposed between the centering device and the glass substrate as adhesive. The centering device is provided with an aperture through which ultraviolet rays are applied to the photo-polymer to cure it.
Inventors
- 👤 Kenji Ohta
- 👤 Akira Takahashi
- 👤 Tetsuya Inui
- 👤 Takao Hyuga
- 👤 Hideyoshi Yamaoka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 03:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
An optical memory disc comprising: a substrate; a plurality of concentric circular grooves formed on said substrate; recording medium disposed on said substrate having said grooves; and a centering device secured to said substrate in a manner that the center of said centering device is positioned at the center of said concentric circular grooves.
Claim 2
Dependent Claim
54 words
An optical memory disc comprising: a substrate; a plurality of concentric circular grooves formed on said substrate; recording medium disposed on said substrate having said grooves; and a centering device secured to said substrate in a manner that the center of said centering device is positioned at the center of said concentric circular grooves.
Claim 3
Dependent Claim
46 words
The optical memory disc of claim 1, wherein said centering device is provided with an aperture transmitting ultraviolet rays, and said centering device is secured to said glass substrate by photo-polymer which is cured by ultraviolet rays applied through said aperture formed in said centering device.
Claim 4
Dependent Claim
72 words
An optical memory disc comprising: a glass substrate; a spiral guide groove formed on said glass substrate; optical memory recording medium disposed on said glass substrate having said spiral guide groove formed thereon; a centering device secured to said glass substrate in a manner that the center of said centering device is positioned at the center of said spiral guide groove; and adhesive disposed between said centering device and said glass substrate.
Claim 5
Dependent Claim
72 words
An optical memory disc comprising: a glass substrate; a spiral guide groove formed on said glass substrate; optical memory recording medium disposed on said glass substrate having said spiral guide groove formed thereon; a centering device secured to said glass substrate in a manner that the center of said centering device is positioned at the center of said spiral guide groove; and adhesive disposed between said centering device and said glass substrate.
Claim 6
Dependent Claim
33 words
The optical memory disc of claim 3, wherein: said adhesive is photo-polymer; and said centering device is provided with aperture means for applying ultraviolet rays to said photo- polymer through said centering device.
Claim 7
Dependent Claim
18 words
The optical memory disc of claim 4, wherein said aperture means is shaped in a desired symbol pattern.
Claim 8
Dependent Claim
93 words
An optical memory disc in which a track which can be used in a tracking operation during the recording or reproduction of data extends around the center of the disc, and in which means are provided at the center of the disc for defining an axis of rotation of the disc, characterised in that the defining means have been positioned in accordance with the location of the track in such a manner that the distance of the track from the axis is constant, or varies in a consistent manner, around the ) axis.
Claim 9
Dependent Claim
93 words
An optical memory disc in which a track which can be used in a tracking operation during the recording or reproduction of data extends around the center of the disc, and in which means are provided at the center of the disc for defining an axis of rotation of the disc, characterised in that the defining means have been positioned in accordance with the location of the track in such a manner that the distance of the track from the axis is constant, or varies in a consistent manner, around the ) axis.
Claim 10
Dependent Claim
14 words
A disc as claimed in claim 6, wherein the track is a guide groove.
Claim 11
Dependent Claim
15 words
A disc as claimed in claim 6 or claim 7, wherein the track is spiral.
Claim 12
Dependent Claim
19 words
A disc as claimed in claim 6 or claim 7, having a plurality of concentric tracks around said axis.
References Cited (Backward Citations)
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