Patent US1925459A successfully refreshed from Google Patents.
EP0233644A2
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EP
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An optical recording disc
Assignee: Sony Corp
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Filing: 1987-02-18
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Granted: —
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Expires: 2007-02-18
Abstract
Abstract An optical recording disc in which a disc substrate made of a synthetic resin having a light transmittance and a hub made of a synthetic resin, fixed to a center part of the disc substrate by means of a predetermined technique such as a supersonic wave expansion molding and on which a circular magnetic metal plate is installed by means of an insert molding and so on are provided and a circular groove which is continuous at an outer peripheral side of a fixing part between the disc substrate and hub is furthermore installed on at feast either of the disc substrate or hub. The groove is provided for absorbing a stress generated due to a difference in thermal expansion rates between the disc substrate made of the synthetic resin and magnetic metal plate.
Inventors
- 👤 Yasuaki C/O Sony Corporation Nakane
- 👤 Kazumine C/O Sony Corporation Ito
- 👤 Sanae C/O Sony Corporation Abe
- 👤 Takashi C/O Sony Corporation Naito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 20:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; B; B29; B29C; B29C66/00; B29C66/40; B29C66/47; B29C66/474; B29C65/00; B29C65/02; B29C65/08; B29C66/01; B29C66/05; B29C66/302; B29C66/3022; B29C66/30223; B29C66/32; B29C66/322; B29C66/70; B29C66/73; B29C66/731; B29C66/7311; B29C66/73111; B29C66/73112; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/832; B29C66/8322; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B7/26; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
122 words
An optical recording disc on which information is optically recorded or reproduced, the optical recording disc comprising: (a) a disc substrate made of a synthetic resin and having a light transmittance; (b) a hub fixed to a substantially center part of the disc substrate and having a magnetic metal plate; and (c) a groove for absorbing a stress imposed on the optical recording disc and generated due to a difference in thermal expansion rates between the disc substrate made of the synthetic resin and magnetic metal plate, which is located at least at a periphery outside of a part at which the disc substrate and hub are fixed together and is extended on at least either of the disc substrate or hub.
Claim 2
Dependent Claim
122 words
An optical recording disc on which information is optically recorded or reproduced, the optical recording disc comprising: (a) a disc substrate made of a synthetic resin and having a light transmittance; (b) a hub fixed to a substantially center part of the disc substrate and having a magnetic metal plate; and (c) a groove for absorbing a stress imposed on the optical recording disc and generated due to a difference in thermal expansion rates between the disc substrate made of the synthetic resin and magnetic metal plate, which is located at least at a periphery outside of a part at which the disc substrate and hub are fixed together and is extended on at least either of the disc substrate or hub.
Claim 3
Dependent Claim
33 words
The optical recording disc as set forth in claim 1, wherein the hub is made of a synthetic resin material at least having the substantially same thermal expansion rate as the disc substrate.
Claim 4
Dependent Claim
24 words
The optical recording disc as set forth in claim 1, wherein the hub is made of the same synthetic resin as the disc substrate.
Claim 5
Dependent Claim
20 words
The optical recording disc as set forth in claim 3, wherein both magnetic metal plate and hub are substantially circular.
Claim 6
Dependent Claim
16 words
The optical recording disc as set forth in claim 4, wherein the groove is formed continuously.
Claim 7
Dependent Claim
19 words
The optical recording disc as set forth in claim 5, wherein the groove is mounted on the disc substrate.
Claim 8
Dependent Claim
32 words
The optical recording disc as set forth in claim 6, wherein the groove is installed on both sides of the outer and inner peripheries of the fixing part of the disc substrate.
Claim 9
Dependent Claim
18 words
The optical recording disc as set forth in claim 5, wherein the groove is installed on the hub.
Claim 10
Dependent Claim
32 words
The optical recording disc as set forth in claim 8, wherein the groove is installed on both sides of the outer and inner peripheries of the fixing part of the disc substrate.
Claim 11
Dependent Claim
16 words
The optical recording disc as set forth in claim 3, wherein the groove is formed intermittently.
Claim 12
Dependent Claim
23 words
The optical recording disc as set forth in claim 3, wherein teh groove is installed on both of the disc substrate and hub.
Claim 13
Dependent Claim
28 words
The optical recording disc as set forth in claim 11, wherein the groove is installed on both sides of the outer and inner peripheries of the fixing part.
Claim 14
Dependent Claim
25 words
The optical recording disc as set forth in claim 12, wherein the magnetic metal plate is installed on the hub by an insert molding method.
Claim 15
Dependent Claim
52 words
The optical recording disc as set forth in claim 13, wherein a plurality of holes are installed through the magnetic metal plate, a projection is installed on the hub and is inserted into the holes, and the projection is then staked so that the magnetic metal plate is attached to the hub.
Claim 16
Dependent Claim
26 words
The optical recording disc as set forth in claim 13, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 17
Dependent Claim
27 words
The optical recording disc as set forth in claim 13, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 18
Dependent Claim
26 words
The optical recording disc as set forth in claim 14, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 19
Dependent Claim
26 words
The optical recording disc as set forth in claim 14, wherein the hub is fixed to the disc substrate by means of a supersonic expansion molding.
Claim 20
Dependent Claim
107 words
A magneto-optical disc, comprising: (a) a disc substrate made of a synthetic resin material and having a light transmittance; (b) a magnetic metal plate in a ring shape installed on the disc substrate; (c) a hub made of a synthetic resin having the similar characteristic as the disc substrate and fixed to the center part of the disc substrate by means of a thermal expansion molding; and (d) grooves each in a ring shape provided on both peripheral sides inside and outside of a part at which the disc substrate and hub are fixed together and provided on both opposing surfaces of the disc substrate and hub.
Claim 21
Dependent Claim
107 words
A magneto-optical disc, comprising: (a) a disc substrate made of a synthetic resin material and having a light transmittance; (b) a magnetic metal plate in a ring shape installed on the disc substrate; (c) a hub made of a synthetic resin having the similar characteristic as the disc substrate and fixed to the center part of the disc substrate by means of a thermal expansion molding; and (d) grooves each in a ring shape provided on both peripheral sides inside and outside of a part at which the disc substrate and hub are fixed together and provided on both opposing surfaces of the disc substrate and hub.
Claim 22
Dependent Claim
25 words
The optical recording disc as set forth in claim 8, wherein the magnetic metal plate is installed on the hub in an insert molding method.
Claim 23
Dependent Claim
52 words
The optical recording disc as set forth in claim 8, wherein a plurality of holes are installed on the magnetic metal plate, a projection is installed on the hub, the projection being inserted in the holes and the projection being staked so that the magnetic metal plate is attached to the hub.
Claim 24
Dependent Claim
26 words
The optical recording disc as set forth in claim 20, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 25
Dependent Claim
27 words
The optical recording disc as set forth in claim 20, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 26
Dependent Claim
26 words
The optical recording disc as set forth in claim 21, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 27
Dependent Claim
26 words
The optical recording disc as set forth in claim 21, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion.
Claim 28
Dependent Claim
26 words
The optical recording disc as set forth in claim 9, wherein the magnetic metal plate is installed on the hub by means of an insert molding.
Claim 29
Dependent Claim
53 words
The optical recording disc as set forth in claim 9, wherein a plurality of holes are installed through the magnetic metal plate and a projection is installed on the hub, the projection being inserted through the holes and the projection being staked so that the magnetic metal plate is mounted on the hub.
Claim 30
Dependent Claim
25 words
The optical recording disc as set forth in claim 26, wherein the hub is fixed to the disc substrate by means of a thermal expansion.
Claim 31
Dependent Claim
27 words
The optical recording disc as set forth in claim 26, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 32
Dependent Claim
26 words
The optical recording disc as set forth in claim 27, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 33
Dependent Claim
27 words
The optical recording disc as set forth in claim 27, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 34
Dependent Claim
26 words
The optical recording disc as set forth in claim 6, wherein the magnetic metal plate is installed on the hub by means of an insert molding.
Claim 35
Dependent Claim
45 words
The optical recording disc as set forth in claim 6, wherein a plurality of holes are installed through the magnetic metal plate and the projection is inserted through the holes, the projection being staked so that the magnetic metal plate is attached to the hub.
Claim 36
Dependent Claim
26 words
The optical recording disc as set forth in claim 32, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 37
Dependent Claim
27 words
The optical recording disc as set forth in claim 32, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 38
Dependent Claim
26 words
The optical recording disc as set forth in claim 33, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 39
Dependent Claim
27 words
The optical recording disc as set forth in claim 33, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 40
Dependent Claim
26 words
The optical recording disc as set forth in calim 7, wherein the magnetic metal plate is installed on the hub by means of an insert molding.
Claim 41
Dependent Claim
26 words
The optical recording disc as set forth in calim 7, wherein the magnetic metal plate is installed on the hub by means of an insert molding.
Claim 42
Dependent Claim
53 words
The optical recording disc as set forth in claim 7, wherein a plurality of holes are installed on the magnetic metal plate and a projection is installed on the hub, the projection being installed through the holes and the projection being staked so that the magnetic metal plate is attached to the hub.
Claim 43
Dependent Claim
26 words
The optical recording disc as set forth in claim 38, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 44
Dependent Claim
27 words
The optical recording disc as set forth in claim 38. Wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
Claim 45
Dependent Claim
26 words
The optical recording disc as set forth in claim 39, wherein the hub is fixed to the disc substrate by means of a thermal expansion molding.
Claim 46
Dependent Claim
27 words
The optical recording disc as set forth in claim 39, wherein the hub is fixed to the disc substrate by means of a supersonic wave expansion molding.
References Cited (Backward Citations)
No citation records indexed.
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