Method for manufacturing optical disk with address and guide grooves
AssigneePioneer Electronic Corporation
InventorsMinemasa Ota, Osamu Kumasaka
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Abstract
A method for manufacturing an optical disk having both address pits and guide grooves having accurately controlled depths and widths. Two different types of sensitive materials of different characteristics are applied to a recording original board to form inner and outer layers thereon. The inner and outer layers are exposed and partially removed independently of each other so that the depth and width of the guide grooves and address pits can be set to desired values with high accuracy.
Claims5
A method for manufacturing an optical disk with address pits and guide grooves comprising the steps of:
- applying to one planar surface of a recording board a first photoresist layer and applying to said first photoresist layer a second photosensitive layer, said first photoresist layer comprising a material sensitive only to recording light having a first wavelength spectrum and said second photoresist layer comprising a material sensitive only to recording light having a second wavelength spectrum different from said first wavelength spectrum;
- selectively subjecting said second photoresist layer to light within said second wavelength spectrum and at an intensity such that the entire thickness of said second layer in selected first areas is exposed;
- selectively subjecting said first photoresist layer in selected second areas, located relative to said selected first areas, to light within said first wavelength spectrum and at an intensity such that the entire thickness of said first layer in said selected second areas is exposed;
- and
- developing said exposed second layer to create a pattern shaped in accordance with said first area and developing said first layer using the remaining photosensitive material of said second layer as a mask.
Dependencies are inferred from the claim text.