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US 4,297,312 AGranted
Method for preparing stylus lapping discs
AssigneeRCA Corporation
InventorsCharles B. Carroll, Howard G. Scheible
Life of this patent
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Abstract
An improved method of reproducing a spiral groove pattern in the surface of a plastic disc wherein the intersections of the surface of a metal article generated during the replication process are filled in to form concave junctions.
Claims4
In a method of replicating a groove pattern in the formation of a lapping disc comprising the steps of:
- 1. recording the pattern in a photoresist layer,
- 2. developing the photoresist layer to form a photoresist master,
- 3. transferring the pattern of the photoresist master to a metal matrix master pattern by coating the photoresist master with a metal to form an electroform, and separating the electroform from the photoresist master to produce the said metal matrix master pattern, and
- 4. replicating the metal matrix master pattern in the surface of a plastic article;
- the improvement which comprises the step of forming concave junctions on the metal matrix master by filling in material at the intersections of the walls and base portions of the metal matrix master.
2 more elements
Dependencies are inferred from the claim text.