US5122313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold for forming substrate having uneven preformat pattern and method of using same
Assignee: Canon Inc
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Filing: 1991-04-11
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Granted: 1992-06-16
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Expires: 2011-04-11
Abstract
Abstract A cast mold and process for casting a substrate for an information recording medium has an uneven preformat pattern formed on the mold surface. The uneven preformat features a pattern corresponding to tracking grooves and information pits, each information pit portion has a size with a length b in the direction parallel to the pattern of the tracking groove of 2 to 15 μm and a width a in the direction perpendicular thereto of 1 to 6 μm and a height c of 300 to 3500 Å. The pit pattern has a pitch which is 1.8-fold or more of pit length b.
Inventors
- 👤 Masataka Yashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:54
CPC Classifications
B; B29; B29D; B29D17/00; B29D17/005; B29C; B29C33/00; B29C33/42; B29C33/424; G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; B29C39/00; B29L; B29L2017/00; B29L2017/001; B29L2017/003; B29L2017/005; G11B7/26; G11B7/263; Y; Y10; Y10S; Y10S425/00; Y10S425/81
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A mold having a mold surface for forming an information recording medium substrate having an uneven preformat pattern, said mold surface comprising said uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to information pits, wherein each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves and said pitch being at least 1.8 (b).
Claim 2
Dependent Claim
115 words
A mold having a mold surface for forming an information recording medium substrate having an uneven preformat pattern, said mold surface comprising said uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to information pits, wherein each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves and said pitch being at least 1.8 (b).
Claim 3
Dependent Claim
42 words
A mold for forming according to claim 1, wherein (b) is from 3 to 12 μm, (a) is from 2 to 4 μm, (c) is from 1000 to 3000 Å and said pit pattern has a pitch of at least 2 (b).
Claim 4
Independent Claim
151 words
A method for preparing an information recording medium substrate comprising the steps of: selecting a mold having a mold surface for forming said substrate, said casting mold surface comprising an uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to tracking grooves and information pit portions corresponding to information pits, wherein: each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves, said pitch being at least 1.8 (b); adding into said mold a substrate-forming composition comprising at least one of monomer or prepolymer; and polymerizing and curing said substrate-forming composition.
Claim 5
Independent Claim
151 words
A method for preparing an information recording medium substrate comprising the steps of: selecting a mold having a mold surface for forming said substrate, said casting mold surface comprising an uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to tracking grooves and information pit portions corresponding to information pits, wherein: each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves, said pitch being at least 1.8 (b); adding into said mold a substrate-forming composition comprising at least one of monomer or prepolymer; and polymerizing and curing said substrate-forming composition.
Claim 6
Dependent Claim
40 words
A method for preparing a substrate according to claim 3, wherein (b) is from 3 to 12 μm, (a) is from 2 to 4 μm, (c) is from 1000 to 3000 Å, and the pitch is at least 2 (b).
Claim 7
Independent Claim
147 words
A method for preparing an information recording medium, comprising the steps: selecting a mold having a mold surface for an information recording medium substrate having an uneven preformat pattern, said mold surface comprising an uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to tracking grooves and information pit portions corresponding to information pits, wherein each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves, said pitch being at least 1.8 (b); forming a substrate using said mold; and forming a recording layer on said substrate.
Claim 8
Independent Claim
147 words
A method for preparing an information recording medium, comprising the steps: selecting a mold having a mold surface for an information recording medium substrate having an uneven preformat pattern, said mold surface comprising an uneven preformat pattern formed thereon, said uneven preformat pattern having tracking groove portions corresponding to tracking grooves and information pit portions corresponding to information pits, wherein each information pit portion has a size with a length (b) of 2 to 15 μm in the direction parallel to the pattern of the tracking groove, a width (a) of 1 to 6 μm in the direction perpendicular thereto and a height (c) of 300 to 3500 Å, said pit pattern having a pitch in the direction parallel to the pattern of the tracking grooves, said pitch being at least 1.8 (b); forming a substrate using said mold; and forming a recording layer on said substrate.
Claim 9
Dependent Claim
42 words
A method for preparing an information recording medium according to claim 5, wherein (b) is from 3 to 12 μm, (a) is from 2 to 4 μm, (c) is from 1000 to 3000 Å, and the pitch is at least 2 (b).
Claim 10
Dependent Claim
20 words
A method for preparing an information recording medium accordint to claim 5, wherein said recording layer is formed by coating.
Claim 11
Dependent Claim
23 words
A method for preparing an information recording medium according to claim 7, wherein the material for said recording layer is an organic dye.
Claim 12
Dependent Claim
21 words
A method for preparing an information recording medium according to claim 5, wherein said information recording medium is an optical card.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |