A forming roll for a substrate used for an optical recording medium comprises a roll for continuously forming substrates used for optical recording mediums having preformatting information. Said roll comprises a roll substrate having on its surface a stamper on which a pattern corresponding with the preformatting information has been formed, and, assuming the radius of said roll substrate as \"r\" mm, the length of said pattern in the peripheral direction of said roll substrate as \"t\" mm, they satisfy the relationship of: l.times.t.ltoreq.0.1.times.r (provided that r.gtoreq.l/2.pi.).

Claims

9 · 1 independent · depth 3

9 granted claims

›1.independentA forming roll for producing an optical recording medium substrate, comprising a roll for continuously forming optical recording media substrates havi…+8

›2.↳ 1A forming roll for a substrate used for an optical recording medium according to claim 1, wherein the length l, of the pattern formed on said stamper,…d2+1

›4.↳ 1A forming roll for a substrate used for an optical recording medium according to claim 1, wherein the radius "r" of said roll substrate ranges from 40…d2+1

›6.↳ 1A forming roll for a substrate used for an optical recording medium according to claim 1, wherein the thickness "t" of said stamper is not less than 0…d2+1

›8.↳ 1A forming roll for a substrate used for an optical recording medium according to claim 1, wherein said stamper has a pattern corresponding with an opt…d2

›9.↳ 1A forming roll for a substrate used for an optical recording medium according to claim 1, wherein said stamper is fixed on said roll substrate through…d2

Classifications

2 codes

USPC · US Patent Classification

425/385425/810

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1.9 y

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Willard E. Hoag

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