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US 7,700,011 B2Granted
Disk forming method
AssigneeSony Corporation
InventorsTakeshi Gouko, Kenji Echizen, Mikio Sato, Akio Koshita
Life of this patent
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Abstract
A boundary lubricant film 1 is formed on a stamper 22 contact portion of a stationary mirror 21 and/or a stationary mirror 21 contact portion of the stamper 22. The boundary lubricant film 1 contains one of kinds of phosphate esters. A material is injected into a cavity 14. As a result, a disc substrate for an optical disc is molded.
Claims1
A method of molding an optical disc substrate, comprising the steps of:
- forming a lubricant film on a stamper contact portion of a mold and/or a mold contact portion of the stamper, the lubricant film containing a phosphate ester;
- equalizing a thickness of an agent which forms the lubricant film formed at the film forming step;
- mounting the stamper on the mold;
- and
- injecting a material into the mold on which the stamper has been mounted at the mounting step and molding a disc substrate,
- wherein the equalizing step is performed by wiping a front surface of the lubricant film formed at the film forming step with solvent which does not dissolve the phosphate ester.
3 more elements
Dependencies are inferred from the claim text.