Press system for nano-imprinting of recording media with a two step pressing method
Recording media press systems and methods of operating such press systems. Embodiments of a press system include a first and second die at least one of which is configured to be coupled to an embossing foil. A stopper may be used to space the embossing foil apart from a magnetic recording disk disposed within the press system by a predetermined gap when the die set is in a closed position. In an embodiment, a piston disposed within at least one of the first and second die is moved relative to the first and second die to press the embossing foil against the magnetic recording disk after the die set stopped in the closed position by the stopper.
1. A press system, comprising:
a first die of a die set;
a second die of the die set, wherein at least one of the first and second die is configured to be coupled to an embossing foil;
a stopper, disposed beyond an outer diameter of the embossing foil, to space the embossing foil apart from a magnetic recording disk disposed within the press system by a predetermined gap when the die set is in a closed position; and
a piston disposed within at least one of the first and second die, the piston to move relative to the first and second die to press the embossing foil against the magnetic recording disk after the die set is in the closed position.
2. The press system as in claim 1 , wherein the piston is to be activated by pressurizing a volume chamber with a gas or liquid after the die set is in the closed position.
3. The press system as in claim 1 , wherein the piston is to travel at least a distance equal to the predetermined gap, the predetermined gap defining an amount of doming in the embossing foil remaining when the press system is in the closed position.
4. The press system as in claim 1 , wherein the stopper comprises a mechanical hard stop.
5. The press system as in claim 4 , wherein the stopper comprises a mechanical hard stop including a first standoff disposed in the first die and a second standoff disposed in the second die, wherein the first standoff is to physically contact the second standoff when the die set is in a closed position.
6. The press system as in claim 5 , wherein the first and second standoffs are machined into the first and second dies to be in substantial alignment with each other and proximate to an outer edge of the magnetic recording disk when the die set in a closed position.
7. The press system as in claim 1 , wherein the predetermined gap is between approximately 0.1 to 0.3 mm.
8. The press system as in claim 1 , wherein the magnetic recording disk has an annular shape and the embossing foil is to imprint a discrete track pattern into the magnetic recording disk.
9. The press system as in claim 8 , wherein each of the first die is coupled to the embossing foil and the second die is coupled to a second embossing foil to imprint a double-sided discrete track pattern into the magnetic recording disk.
10. The press system as in claim 9 , wherein the piston is disposed in the first die and a second piston is disposed in the second die.
11. A press system, comprising:
means for receiving a magnetic recording disk on a first die of a die set while the die set is in an open state;
means for aligning the first die to a second die by closing the die set;
means for stopping the closing of the die set when an embossing foil coupled to the first die is spaced apart from the magnetic recording disk by a predetermined gap, wherein the means for stopping is disposed beyond an outer diameter of the embossing foil;
means for displacing a piston, disposed within at least one of the dies, relative to the first and second die to press the embossing foil against the magnetic recording disk while the die set is in a closed state.
12. The press system as in claim 11 , wherein the means for stopping the closing of the die set further comprises a first standoff on the first die and a second standoff on the second die to stop the closing in response to the first standoff making mechanical contact with the second standoff.
13. The press system as in claim 1 , wherein the stopper comprises a die displacement controller reactive to an optical sensor, electrical sensor, or a mechanical sensor.