Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1995-12-18
1998-06-09
Ryan, Patrick
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428 642, 428 643, 428 644, 428 651, 428 652, 428913, 3692751, 3692754, 369277, 369283, B32B 300
Patent
active
057630372
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a base or substrate for an optical recording medium and a stamper for manufacturing such a base for optical recording medium, and more particularly to a base for an optical recording medium having grooves and a stamper used for manufacturing a base of such an optical recording medium having grooves.
BACKGROUND OF THE INVENTION
Optical discs as an optical recording medium use light beams for recording or reproduction of information signals, and have various merits that they permit recording or reproduction of information signals of large information content, and have high reliability in reproduction of recorded information signals and recording of information signals with respect t/o deterioration with age, etc. Optical discs having such merits are widely used as information recording media of an information processing system, an audio disc system or a video disc system.
Such an optical disc consists of a disc base having light transmission property, a recording layer or a reflection layer formed on one surface of the disc base, and a protective layer for protecting the reflection layer or the recording layer. The optical disc thus constituted is manufactured through a process of making a recording original disc including a recording process for information signals, a mastering process of making a stamper including a metal mold making up process, etc., a process of molding a disc base, a film formation process of implementing a film formation onto the disc base, and post-processing process, etc.
In the mastering process, laser beams modulated on the basis of recording information signals are irradiated, by means of an optical head as a laser recording device, onto a glass base subject to rotationally driving on which photoresist is painted or coated, thereby allowing the photoresist layer to be exposed to light in correspondence with the information signal. After processing such as development, etc. is implemented to the glass base which has undergone exposure process, a stamper where uneven portions corresponding to information signals are transferred to the surface of metal material by the electrocasting process which carries out electrocasting of the metal material is formed on the glass base.
The stamper which has been made after undergoing the mastering process and the electrocasting process described above is mounted onto a forming metal mold. By filling resin material into the metal mold on which the stamper has been mounted, a disc base depressions or uneven portions corresponding to information signals have been transferred to the surface is mold ed. In the case of an optical disc where write-once or re-recording of information signals is permitted, film of a recording layer or a reflection layer is formed by vacuum deposition, etc. on the surface of the molded disc base. The disc base to which film formation has be implemented is completed as an optical disc via film coating process for the protective layer, or is completed via such coating process as rewritable optical disc. Hub for clamping the optical disc onto the disc rotational drive mechanism is attached to the optical disc thus completed, and or a label is printed thereon.
The detail of the above-described mastering process will now be described in more detail with reference to the attached drawings.
For the original disc material for making a stamper which will be described later, a glass base 1 which is permitted to ensure high surface accuracy and is formed by inexpensive soda lime glass is used as shown in FIG. 2a. This glass base 1 is caused to undergo regenerative treatment of abrasion polishing of the surface, etc. at the first step S.sub.1, and is sufficiently cleaned by ultrasonic cleaner, etc., at the second step S.sub.2. The glass base is then fitted onto a spinner. At the subsequent third step S.sub.3, as shown in FIG. 2b, photoresist is dropped onto the surface of the glass base 1 in the state where it is mounted on the rotationally operated spinner, whereby a photosensitive layer
REFERENCES:
patent: 4947384 (1990-08-01), Suzuki et al.
patent: 5213859 (1993-05-01), Aoi et al.
patent: 5344683 (1994-09-01), Shimizu
patent: 5431975 (1995-07-01), Honguh et al.
Nomura Hiroshi
Ohtomo Katsuhiko
Evans Elizabeth
Ryan Patrick
Sony Corporation
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