Claims
- 1. A method of manufacturing a mold for use in providing an information disc with an optically readable structure, said disc comprising an annular substrate, a reproduction layer adhered to said substrate, and a hub attached to the center of said substrate, said hub having a central through-hole with a wall of circular cross-section, said method comprising
- providing a base having a central recess with a wall of circular cross section,
- providing an auxiliary tool having a central recess with a wall of circular cross section,
- detachably connecting a structure carrier provided with a mold structure to an auxiliary substrate identical to the substrate used for said disc,
- centering the mold structure relative to the central recess of the auxiliary tool,
- centering a disc hub relative to the mold structure by using first centering means which is inserted into the through-hole of the hub and into the central recess of the auxiliary tool,
- fixing the hub thus centered to the auxiliary substrate,
- centering the assembly comprising the structure carrier, the auxiliary substrate, and the hub on the base by using second centering means which is inserted into the through-hole of the hub and into the central recess of the base,
- fixing the structure carrier to the base, and
- detaching the auxiliary substrate from the mold structure.
- 2. A method as in claim 1 wherein the auxiliary substrate is transparent and is detachably connected to the structure carrier by means of a substance which is applied in the liquid phase and is cured by radiation.
- 3. The method of claim 1 wherein the first centering means is identical to the second centering means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8501148 |
Apr 1985 |
NLX |
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Parent Case Info
This application is a division of U.S. application Ser. No. 057,885, filed 6-1-87, now U.S. Pat. No. 4,827,469, which is a division of U.S. application Ser. No. 778,659, filed 9-23-85, now U.S. Pat. No. 4,670,077, hereby incorporated by reference.
US Referenced Citations (8)
Divisions (2)
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Number |
Date |
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Parent |
57885 |
Jun 1987 |
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Parent |
778659 |
Sep 1985 |
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