EP0706178A2
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EP
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Optical information medium, method for producing the optical information medium, and unit for producing the optical information medium
Assignee: Panasonic Holdings Corp
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Filing: 1995-10-02
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Granted: —
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Expires: 2015-10-02
Abstract
Abstract The optical information medium of the invention includes: a first substrate having a first information signal layer; a first reflective film formed on the first information signal layer of the first substrate; a second substrate having a second information signal layer; a second reflective film formed on the second information signal layer of the second substrate; and a photopolymer resin film provided between the first reflective film and the second reflective film for bonding the first substrate and the second substrate with each other. Another embodiment comprises a semi-transparant film on the first information signal layer of the first substrate. <IMAGE>
Inventors
- 👤 Michiyoshi Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:25
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/256; G11B7/258; G11B7/2585; B; B29; B29C; B29C65/00; B29C65/02; B29C65/14; B29C65/1403; B29C65/1406; B29C65/1429; B29C65/1435; B29C65/1477; B29C65/1483; B29C65/48; B29C65/4805; B29C65/483; B29C65/4845; B29C65/52; B29C65/521; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/45; B29C66/452; B29C66/70; B29C66/72; B29C66/723; B29C66/7232; B29C66/72321; B32; B32B; B32B37/00; B32B37/12; G11B7/26; B29C65/481; B29C65/4815; B29C66/71; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005; B32B2310/00; B32B2310/08; B32B2310/0806; B32B2310/0831; B32B2429/00; B32B2429/02; G11B7/257; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/25716; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
81 words
An optical information medium comprising: a first substrate having a first information signal layer; a first reflective film formed on the first information signal layer of the first substrate; a second substrate having a second information signal layer; a second reflective film formed on the second information signal layer of the second substrate; and a photopolymer resin film provided between the first reflective film and the second reflective film for bonding the first substrate and the second substrate with each other.
Claim 2
Dependent Claim
26 words
An optical information medium according to claim 1, wherein the first and the second reflective films are made of a metallic material mainly composed of aluminum.
Claim 3
Dependent Claim
28 words
An optical information medium according to claim 1, wherein at least one of the first and the second reflective films has a thickness of 0.1 µm or less.
Claim 4
Dependent Claim
20 words
An optical information medium according to claim 1, wherein the first and the second substrates have a substantially equal thickness.
Claim 5
Dependent Claim
24 words
An optical information medium according to claim 4, wherein the first and the second substrates have a thickness of 0.57 mm to 0.63 mm.
Claim 6
Dependent Claim
30 words
An optical information medium according to claim 1, wherein a pit art is formed on at least one of the first information signal layer and the second information signal layer.
Claim 7
Dependent Claim
38 words
An optical information medium according to claim 1, wherein a recording material film is provided at least one of between the first substrate and the first reflective film and between the second substrate and the second reflective film.
Claim 8
Independent Claim
151 words
A method for producing an optical information medium, comprising the steps of: forming a first substrate having a first information signal layer on one side thereof; forming a first reflective film on the first information signal layer of the first substrate; forming a second substrate having a second information signal layer on one side thereof; forming a second reflective film on the second information signal layer of the second substrate; superposing the first and the second substrates so that the first and the second reflective films are opposed to each other with a photopolymer resin therebetween; and irradiating the photopolymer resin with light at least through the second substrate and the second reflective film so as to perform a multiple reflection of a part of the light between the first and the second reflective films and cure the photopolymer resin, thereby bonding the first and the second substrates with each other.
Claim 9
Dependent Claim
78 words
A method for producing an optical information medium according to claim 8, wherein the step of superposing the first and the second substrates comprises the steps of: applying the photopolymer resin in a donut shape while rotating the first substrate, and superposing the second substrate on the first substrate so that the first and the second reflective films are opposed to each other via the photopolymer resin so as to integrally rotate the first and the second substrates.
Claim 10
Dependent Claim
60 words
A method for producing an optical information medium according to claim 8, further comprising a step of disposing a transparent plate on the second substrate so as to press the second substrate via the transparent plate after performing the step of superposing the second substrate on the first substrate so as to integrally rotate the first and the second substrates.
Claim 11
Dependent Claim
30 words
A method for producing an optical information medium according to claim 8, wherein the first and the second reflective films are made of a metallic material mainly composed of aluminum.
Claim 12
Dependent Claim
116 words
A unit for producing an optical information medium by bonding a first substrate including a first reflective film formed on a first information signal layer of the first substrate and a second substrate including a second reflective film formed on a second information signal layer of the second substrate with each other, comprising: an apparatus for applying a photopolymer resin on the first reflective film while rotating the first substrate; an apparatus for superposing the second substrate on the photopolymer resin so that the first and the second reflective films are opposed to each other; an apparatus for integrally rotating the first and the second substrates; and an apparatus for irradiating the photopolymer resin with light.
Claim 13
Dependent Claim
127 words
A unit for producing an optical information medium by bonding a first substrate including a first reflective film formed on a first information signal layer of the first substrate and a second substrate including a second reflective film formed on a second information signal layer of the second substrate with each other, comprising: an apparatus for applying a photopolymer resin on the first reflective film while rotating the first substrate; an apparatus for superposing the second substrate on the photopolymer resin so that the first and the second reflective films are opposed to each other; an apparatus for integrally rotating the first and the second substrates; an apparatus for pressing the second substrate via a transparent plate; and an apparatus for irradiating the photopolymer resin with light.
Claim 14
Dependent Claim
175 words
A unit for producing an optical information medium comprising: a first production block comprising a first molding machine for forming a first substrate including a first information signal layer thereon, and a first sputtering apparatus for forming a first reflective film on the first information signal layer of the first substrate; a second production block comprising a second molding machine for forming a second substrate including a second information signal layer thereon, and a second sputtering apparatus for forming a second reflective film on the second information signal layer of the second substrate; a third production block for opposing the first reflective film of the first substrate and the second reflective film of the second substrate via a photopolymer resin film and then irradiating the photopolymer resin film with light at least through the second substrate and the second reflective film; and a transporter for moving the first substrate from the first production block to the third production block and moving the second substrate from the second production block to the third production block, respectively.
Claim 15
Dependent Claim
77 words
An optical information medium comprising: a first substrate having a first information signal layer; a semi-transparent film formed on the first information signal layer of the first substrate; a second substrate having a second information signal layer; a reflective film formed on the second information signal layer of the second substrate; and a photopolymer resin film provided between the semi-transparent film and the reflective film for bonding the first substrate and the second substrate with each other.
Claim 16
Dependent Claim
17 words
An optical information medium according to claim 15, wherein the reflective film includes a recording material film.
Claim 17
Dependent Claim
24 words
An optical information medium according to claim 15, wherein a thickness of the first substrate is in a range of 0.55 to 0.61 mm.
Claim 18
Dependent Claim
24 words
An optical information medium according to claim 15, wherein a thickness of the photopolymer resin is in a range of 30 to 60 µm.
Claim 19
Dependent Claim
30 words
An optical information medium according to claim 15, wherein a pit art is formed on at least one of the first information signal layer and the second information signal layer.
Claim 20
Independent Claim
148 words
A method for producing an optical information medium, comprising the steps of: forming a first substrate having a first information signal layer on one side thereof; forming a semi-transparent film on the first information signal layer of the first substrate; forming a second substrate having a second information signal layer on one side thereof; forming a reflective film on the second information signal layer of the second substrate; superposing the first and the second substrates so that the semi-transparent film and the reflective film are opposed to each other with a photopolymer resin therebetween; and irradiating the photopolymer resin with light at least through the first substrate and the semi-transparent film so as to perform a multiple reflection of a part of the light between the semi-transparent film and the reflective film and cure the photopolymer resin, thereby bonding the first and the second substrates with each other.
Claim 21
Dependent Claim
174 words
A unit for producing an optical information medium comprising: a first production block comprising a first molding machine for forming a first substrate including a first information signal layer thereon, and a first sputtering apparatus for forming a semi-transparent film on the first information signal layer of the first substrate; a second production block comprising a second molding machine for forming a second substrate including a second information signal layer thereon, and a second sputtering apparatus for forming a reflective film on the second information signal layer of the second substrate; a third production block for opposing the semi-transparent film on the first substrate and the reflective film on the second substrate with each other with a photopolymer resin film therebetween and then irradiating the photopolymer resin film with light at least through the first substrate and the semi-transparent film; and a transporter for moving the first substrate from the first production block to the third production block and moving the second substrate from the second production block to the third production block, respectively.
References Cited (Backward Citations)
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