EP0729142A1
Expired / Lapsed
EP
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Optical recording medium and method of manufacturing same
Assignee: Sony Corp
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Filing: 1996-02-27
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Granted: —
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Expires: 2016-02-27
Abstract
Abstract An optical recording medium includes a first recording member (31) having a first light-transmissive substrate (31S) and a first semi-light-transmissive information area (31M) disposed on a surface of the first light-transmissive substrate, and a second recording member (32) having a second substrate (32S) and a second reflective information area (32M) disposed on a surface of the second substrate. The first recording member (31) and the second recording member (32) are joined to each other with the transparent layer (33) interposed therebetween with the first and second information areas facing each other.
Inventors
- 👤 Hiroshi Ohki
- 👤 Toshiyuki Kashiwagi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:53
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2403; G11B7/24062; G11B7/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
An optical recording medium comprising: a first recording member (31) having a first light-transmissive substrate (31S) and a first semi-light-transmissive information area (31M) disposed on a surface of said first light-transmissive substrate; a second recording member (32) having a second substrate (32S) and a second reflective information area (32M) disposed on a surface of said second substrate; and a transparent layer (33), said first recording member (31) and said second recording member (32) being joined to each other with said transparent layer interposed therebetween with the first and second information areas facing each other.
Claim 2
Dependent Claim
35 words
An optical recording medium according to claim 1, wherein light is applied to the optical recording medium from a surface of said first recording member (31) which is opposite to the first information area (31M).
Claim 3
Dependent Claim
48 words
An optical recording medium according to claim 1, wherein the first information area (31M) has a reflectance ranging from 20 % to 50 % and a transmittance ranging from 30 % to 80 %, and the second information area (32M) has a reflectance of at least 60 %.
Claim 4
Dependent Claim
65 words
An optical recording medium according to claim 2, wherein the first and second information areas (31M, 32M) have respective recording tracks (31T, 32T) arranged coaxially with each other, such that recording progresses in the same direction along the recording tracks as the first and second information areas rotate, as viewed from said surface of said first recording member (31) from which the light is applied.
Claim 5
Dependent Claim
80 words
An optical recording medium according to claim 2, wherein the first and second information areas (31M, 32M) have respective recording tracks (31T, 32T) arranged coaxially with each other, such that the recording track of one (31T) of the first and second information areas extends progressively radially outwardly along the direction in which recording progresses, and the recording track of the other (32T) of the first and second information areas extends progressively radially inwardly along the direction in which recording progresses.
Claim 6
Dependent Claim
23 words
An optical recording medium according to claim 1, wherein the first and second substrates (31S, 32S) have the same thickness as each other.
Claim 7
Independent Claim
98 words
A method of manufacturing an optical recording medium, comprising the steps of: separately fabricating a first recording member (31) having a first light-transmissive substrate (31S) and a first semi-light-transmissive information area (31M) disposed on a surface of said first light-transmissive substrate, and a second recording member (32) having a second substrate (32S) and a second reflective information area (32M) disposed on a surface of said second substrate; and joining said first recording member and said second recording member to each other with a transparent layer (33) interposed therebetween with the first and second information areas facing each other.
Claim 8
Independent Claim
85 words
A method of manufacturing an optical recording medium, comprising the steps of: fabricating a first substrate (31S) having a first information area (31M) and a second substrate (32S) having a second information area (32M) by respective injection-molding processes; forming a reflecting surface (35) on said second information area of said second substrate; and joining said first recording member (31) and said second recording member (32) to each other with a transparent layer (33) interposed therebetween with the first and second information areas facing each other.
References Cited (Backward Citations)
GB2017379A
Cited
EP0437223A2
Cited
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