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Optical disk employing integral substrate, and method for manufacturing the same
| Details |
Inventors: Ro, Myong-do;
Assignee: Samsung Electronics Co., Ltd. (KR)
Primary Examiner: Resan; Stevan A.
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, L.L.P.
An optical disk, which comprises: a common integral substrate having grooves and/or pits formed on its both sides: and a film structure on at least one side of the integral substrate. They are manufactured by preparing two stampers; simultaneously forming grooves and pits on both sides of an integral substrate by use of said two stampers mounted on a respective fixed mold and moving mold; and forming the film structure on at least one side of said integral substrate by depositing material from targets suspended to both sides of said integral substrate. The disks are superior in mechanical properties and reliability. As for reliability, the present optical disk is prepared without using a bonding process, which overcomes the problem of adhesive out-flow. The presence of only one integral substrate brings about an increased data storage density, twice as much per substrate, while contributing to the lightness of disk and accompanied by various effects including reduction in access time, saving of the bonding process and time in the spin coating, and cost reduction. |
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DETAILED DESCRIPTION It is an object of the present invention to overcome the above problems encountered in prior art and to provide an integral substrate the opposite sides of which are molded through an injection molding process, thereby saving the adhesive process using a hot melt adhesive or UV setting resin.
It is another object of the present invention to provide an optical disk which employs the integral substrate.
It is a further object of the present invention to provide a method for manufacturing the optical disk, using the integral substrate.
Intensive research repeated by the present inventors aiming to develop an optical disk, which is significantly improved in reliability and production cost, has resulted in finding that one integral substrate, on both sides of which grooves and/or pits can be formed, is sufficient to design an optical disk structure.
In accordance with an aspect of the present invention, there is provided an integral substrate for an optical disk, possibly having grooves and/or pits on both of its sides, without junction parts at its center.
In accordance with another aspect of the present invention, there is provided an optical disk, comprising an integral substrate possibly having grooves and/or pits formed on both sides, and a stack structure, comprising a reflective film, a first dielectric film, an optical recording film, a second dielectric film and a protective layer which are, in sequence, laminated on at least one side of said integral substrate.
In accordance with still a further aspect of the present invention, there is provided a method for manufacturing an optical disk, comprising the steps of: preparing two stampers; forming grooves and/or pits on one or simulaneouly on both sides of an integral substrate, by use of said two stampers mounted on a fixing mold and a moving mold, respectively; and forming a film structure on at least one side of said integral substrate, by depositing targets suspended on at least one side of said integral substrate
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Manufacturing Materials 
