EP0195720A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Ventilation arrangement for use in an optical recording disc
Assignee: Maxell Ltd
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Filing: 1986-03-19
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Granted: —
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Expires: 2006-03-19
Abstract
Abstract An optical recording disc comprising two cylindrical disc substrates (1), having a round center hole (1a), at least one recording layer (3) formed on the surface of at least one said disc substrate, and at least one bonding layer (8) is formed at an inner rim (4) and/or an outer rim (5) of the surface of the disc substrate where the recording layer is formed, except for at least one portion (4a,5a) of the rim, wherein the bonding layer is provided to bond the two disc substrates together, so that the surface of the disc substrates face each other, thereby a space gap (6) is formed between the disc substrates, and the portion of the rim where the bonding layer (8) is not formed, can act as a ventilation path, through which air can pass from the air gap (6) into the outside of the optical recording disc, and reversely.
Inventors
- 👤 Toshinori Sugiyama
- 👤 Mitsuru Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24015; G11B7/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
An optical recording disc comprising two disc substrates (1,11), each in a cylindrical shape having a round center hole (la), at least one recording layer (3) formed on the surface of at least one said disc substrate, and at least one bonding material layer (8) is formed at an inner rim portion (4,12) and/or an outer rim portion (5,13) of the surface of the said disc substrate, on the surface of which the recording layer is formed, except for at least one portion (4a,5a,12a,13a) of the said rim portion of the surface of the disc substrate, wherein the bonding material layer (8) is provided to bond the said two disc substrates together, so that the surfaces of the said disc substrates, on the surface of which the recording layer is formed, face each other, thereby a space gap (6) is formed between the said disc substrates, and the said one portion of the said rim portion of the surface of the disc substrate, where the bonding material layer is not formed, can act as a ventilation path, through which the air can pass from the said air gap (16) into the outside of the optical recording disc, and reversely.
Claim 2
Dependent Claim
199 words
An optical recording disc comprising two disc substrates (1,11), each in a cylindrical shape having a round center hole (la), at least one recording layer (3) formed on the surface of at least one said disc substrate, and at least one bonding material layer (8) is formed at an inner rim portion (4,12) and/or an outer rim portion (5,13) of the surface of the said disc substrate, on the surface of which the recording layer is formed, except for at least one portion (4a,5a,12a,13a) of the said rim portion of the surface of the disc substrate, wherein the bonding material layer (8) is provided to bond the said two disc substrates together, so that the surfaces of the said disc substrates, on the surface of which the recording layer is formed, face each other, thereby a space gap (6) is formed between the said disc substrates, and the said one portion of the said rim portion of the surface of the disc substrate, where the bonding material layer is not formed, can act as a ventilation path, through which the air can pass from the said air gap (16) into the outside of the optical recording disc, and reversely.
Claim 3
Dependent Claim
56 words
The optical recording disc as defined in claim I, wherein at least one air space (4a,5a,12a,13a) is arranged in the bonding material layer (8) formed between the inner rim (4,12) portion and/or the outer rim portion (5,13) of the surface of the disc substrate, thereby the said air space can act as the said ventilation path.
Claim 4
Dependent Claim
90 words
The optical recording disc as defined in claim 1, wherein the inner rim portion and/or the outer rim portion of at least one side surface of the disc substrates, or a member bonded on the disc substrate such as a spacer, are made a rough surface (4c,12c), and the bonding material layer is formed on the rough surface except for one portion of the rough surface, thereby the said one portion of the rough surface, where the bonding material layer is not formed, can act as the said ventilation path.
Claim 5
Dependent Claim
100 words
The optical recording disc as defined in claim 1, further comprising at least one cylindrical spacer (4) having a round center hole and at least one rough surface (4c) and having a predetermined inner diameter and a predetermined outer diameter, wherein the bonding material layer is formed on the rough surface of the said spacer except for one portion of the said rough surface, and the said two disc substrates are bonded together through the said spacer, thereby said one portion of the rough surface, where the bonding material layer is not formed, can act as the said ventilation path.
Claim 6
Dependent Claim
132 words
The optical recording disc as defined in claim 1, wherein the said respective disc substrate comprising an inner projected portion (12) in a cylindrical shape formed at the inner rim portion of the surface of the disc substrate, and an outer projected portion (13) in a cylindrical shape formed at the outer rim portion of the surface of the disc substrate, wherein the surface of the inner projected portion and/or the outer projected portion of at least one said disc substrate are made a rough surface (12c), and the bonding material layer (8) is formed on the said rough surface except for one portion of the rough surface, thereby one said portion of the rough surface, where the bonding material layer is not formed, can act as the said ventilation path (12a).
Claim 7
Dependent Claim
46 words
The optical recording disc as defined in any one of claims 3 through 5, wherein the interval between the top points of the said rough surface (12c), corresponding to the roughness of the rough surface, is in the range of 0.5 - 3 / <m( micrometer).
Claim 8
Dependent Claim
106 words
The optical recording disc as defined in claim 1, wherein at least one projected portion (16) for facing is formed on a portion of the inner rim portion (4,12) and/or the outer rim portion (5,13) of at least one side surface of the said disc substrate, the bonding material layer (8) is formed on the inner rim portion and/or the outer rim portion of the surface of the said disc substrate except the said portion where the projected portion (16) for facing is formed, and the two disc substrates are bonded together, thereby the said projected portion for facing can act as the said ventilation path.
Claim 9
Dependent Claim
78 words
- The optical recording disc as defined in claim 4, wherein at least one projected portion (16) for facing is formed on the surface of at least one spacer (4,5), the bonding material layer is formed on the surface of at least one spacer, except the said portion where the projected portion for facing is formed, and the two disc substrates are bonded together, thereby the said projected portion for facing can act as the said ventilation path.
Claim 10
Dependent Claim
71 words
The optical recording disc as defined in claim 7, wherein the surface of the said projected portion (16) for facing is made a rough surface (16c), and a through path is formed so that the through path is extended from the end portion of the projected portion for facing to the inner or outer surface of the said disc substrate, thereby the through path can act as the said ventilation path.
Claim 11
Dependent Claim
70 words
The optical recording disc as defined in claim 8, wherein the surface of the said projected portion (16) for facing is made a rough surface (16c), and a through path is formed so that the through path is extended from the end portion of the projected portion for facing to the inner or outer surface of the said spacer, thereby the through path can act as the said ventilation path.
References Cited (Backward Citations)
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