Device for producing an information recording disk
US4472124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1981 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Sep 4, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A device for producing information recording disks comprises a stamper mount for placing a stamper thereon, a stamper-fixing shaft for fixing the stamper, and a pressing plate for pressing a backing plate toward the stamper after a liquid resin is injected in the space between the backing plate and the stamper. Injection is effected via a passage made at the center of the stamper mount, and the injected resin is stretched outwardly radially by pressing the backing plate. An ultraviolet ray is irradiated to the stretched resin through the backing plate to harden the resin. An injection valve movably received in the stamper-fixing shaft may be used so that uninjected resin is prevented from being hardened. The injection valve may have a center projection as well as a flange portion at its top so that machining for making a center hole of the disk is unnecessary. The periphery of the flange portion may be wetted by the resin before the backing plate is placed on the flange portion. The stretching speed of the resin is controlled so that air bubbles are prevented from being taken into the resin. The stamper may be attracted by magnetic forces to the stamper mount. A stamper having a fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.