| 摘要 |
PURPOSE:To produce compact size, read only optical recording discs easily by preparing a transparent plastic sheet coated with a reflecting film as a sheet to be formed, and hot-pressing it using a stamper carrying projection and dents representing signals. CONSTITUTION:A disc 1 consists of a transparent plastics, for example, constituted of PMMA with a thickness of 0.3-2mm. The sheet is coated with a vacuum- deposited aluminum film as the reflecting layer 2 for reading light. The film has a thickness of 400-600Angstrom and a breaking elongation of 300%. The disc substrate 1 is hot-pressed with the stamper to be applied over the aluminum film to give flaws representing signals to the PMMA sheet.
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