High-density optical disk and method of producing the same

Inactive Publication Date: 2002-06-11
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

An object of the present invention is to provide a high-density optical disk which can increase recording capacity and ensure durability.
Another object of the present invention is to provide a high-density optical disk which can simplify work and raise yield.

Problems solved by technology

However, if there is dust or a contaminant in the incident direction of a light beam, the above optical disk substrate may generate an error during reproduction since a spot of the light beam is scattered.
Moreover, since an information surface is exposed to the exterior, the information surface may be damaged when using the disk and it is necessary to supplement the durability of the optical disk.

Method used

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  • High-density optical disk and method of producing the same
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  • High-density optical disk and method of producing the same

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Embodiment Construction

In the following description, well known functions and constructions which may obscure the present invention are not described in detail.

To fabricate a typical optical disk, there is needed a series of processes, that is, a mastering process, a stamper making process, a disk molding process, reflective layer and protective layer forming processes, a post process, etc. The mastering process is to make a glass master by forming minute pits on a photoresist covered on a glass platter by a photolithography process. The stamper making process is to transfer the minute pits formed on the glass master onto a stamper by a nickel plating process. The disk molding process is to reproduce optical disk substrates in large quantities by using the stamper. Various disk molding processes are compression molding, injection molding, photopolymerization (2P), etc. An example of a conventional molding machine is shown in FIG. 3 A substrate 20 is supported by a fixed mold 22. A moving mold 24 moves a s...

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Abstract

A high-density optical disk includes reflective layers respectively formed at both information-recorded surfaces of a first substrate, and semitransparent layers respectively formed at one information-recorded surface of each of second and third substrates. The second and third substrates are respectively bonded at both sides of the first substrate.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to an optical recording medium from which recorded information is reproduced by using a laser and method of producing the same and, more particularly, to a high-density recording medium which can densely record the information and from which the information is reproduced.2. Description of the Related ArtRecently, a study of a high-density optical disk which is spotlighted as audio and video recording media has actively been made. A digital video disk (DVD) system which is a representative example of an information transmission medium of high picture quality and high sound quality has brought about the concept of a multimedia age combining digital video information with audio information. The birth of the DVD system includes prospects for a vast commercial market as a substitute demand for video cassette recorders and laser disks which are analog video systems, in addition to achieving technical innovat...

Claims

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Application Information

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IPC IPC(8): G11B7/26G11B7/253G11B7/24G11B7/257G11B7/258
CPCG11B7/24G11B7/253G11B7/258G11B7/26G11B7/2585Y10T428/21G11B7/263Y10S428/913Y10S430/146G11B7/2595Y10T428/31678G11B7/2403
InventorRO, MYONG-DOGILL, BYEUNG-LYONG
OwnerSAMSUNG ELECTRONICS CO LTD