Method for manufacturing disc-shaped optical recording medium and disc-shaped substrate for optical recording medium
AssigneeTDK Corporation
InventorsHiroshi Takasaki, Hideki Ishizaki, Mamoru Usami
Life of this patent
Estimating the term…
Abstract
A disc-shaped substrate for a disc-shaped optical recording medium is accurately and stably positioned and held during a sputtering process. A non-sputtering surface of the disc-shaped substrate opposite to a sputtering surface has a circular recess formed at a center thereof. A carrier, on which the disc-shaped substrate is supported during the sputtering process, has a projective member for fitting into the circular recess to accurately position and hold the disc-shaped substrate during the sputtering process.
Claims24
A method for manufacturing a disc-shaped optical recording medium comprising:
- a step of forming a disc-shaped substrate without a central hole for optical medium chucking, so that said disc-shaped substrate has a positioning guide formed in a non-sputtering surface being one surface of said disc-shaped substrate;
- at least one sputtering step of forming a film on a sputtering surface with sputtering of said disc-shaped substrate positioned by a carrier, while said positioning guide positions said disc-shaped substrate in place.
A disc-shaped substrate for a disc-shaped optical recording medium, on a surface of which at least one film is formed by sputtering, the substrate comprising:
- a sputtering surface being one surface of said disc-shaped substrate, said sputtering surface being a continuous surface from a periphery to a vicinity of the center thereof without a central hole;
- a non-sputtering surface being the other surface of said disc-shaped substrate, having a circular recess formed at a center of said non-sputtering surface.
Dependencies are inferred from the claim text.