Method of producing stamper for optical recording medium, method of producing substrate, and method of producing optical recording medium

Abstract

A method of producing a stamper for roughening a substrate of an optical recording medium contains the steps of placing a conductive ring having a hole at the center thereof on a major surface of an original metal plate, electroforming a metal layer over a portion of the metal plate exposed in the hole of the conductive ring, an inner end-face of the conductive ring, and a portion of a major surface of the conductive ring, and entirely or partly roughening a major surface of the metal layer by a blasting treatment to obtain an original stamper.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method of producing a stamper for an optical recording medium, a method of producing a substrate, and a method of producing an optical recording medium, particularly a method of producing a stamper for an optical recording medium containing a substrate having an entirely or partly roughened major surface, a method of producing such a substrate, and a method of producing such an optical recording medium.[0003]2. Description of the Related Art[0004]In several known optical recording media such as CD-Rs and DVD-Rs, electronic information is recorded on a recording surface, and a label is attached to the reverse surface. Visible information of the contents of the electronic information, such as a song title of music data or a title of recorded data, is printed on the label, and the reverse surface is called a label surface.[0005]Such optical recording media are produced by printing a title...

AI Technical Summary

Benefits of technology

[0023]An optical recording medium excellent in the visibility of an image on a label surface can be produced by the method of the third aspect.

[0024]As described above, by using the stamper producing method, or the substrate producing method of the present invention, the optical recording medium excellent in the visibility of an image on a label surface can be obtained.

[0025]Further, by using the optical recording medium producing method of the present invention, the visibility of an image on a label surface can be improved.

Problems solved by technology

Therefore, complicated operations are required for producing the optical recording media.

Thus, additional printers are not needed, and also the complicated operations of attaching the label sheet are not required.

In this case, the grooves on the other substrate act as a diffraction grating for external lights to cause strong interference, thereby resulting in poor visibility of a recorded visible image.

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