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US 5,843,296 AGranted
Method for electroforming an optical disk stamper
AssigneeDigital Matrix
InventorAlex Greenspan
Life of this patent
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AssigneeDigital Matrix
InventorAlex Greenspan
Estimating the term…
The present invention includes an apparatus and method for continuously adjusting the anode/cathode distance for controlling uniformity of deposition. The entire cathode head is mounted on a lead screw which, when manually turned, moves the cathode head in or out in relation to the anode basket. Alternatively, the lead screw mechanism is driven by a servo motor and is suitably controlled by a computer which monitors the voltage and current in the electroforming cell and adjusts the screw accordingly. The present invention also includes an apparatus and method for a hinged, coated, metal clamping mechanism for fixturing a master against a backplate. To avoid plating of the metallic clamping ring, the metal is coated with a suitable substantially non-conductive, substantially non-chipping, extremely thin material. A hinge mechanism is incorporated onto the clamping ring to allow rotation of the clamping ring, thereby allowing an operator to quickly load or unload parts because of the ease and quickness in opening and closing of the fixture.
A method for electroforming an optical disk stamper by controlling the uniformity of deposition onto a mandrel, said method comprising the steps of:
A method for securing a mandrel between a clamping ring and a backplate in preparation for electroforming an optical disk stamper, said clamping ring having a locking device, said locking device including a dowel having a first end and a second end and a sphere attached to said second end of said dowel, said first end of said dowel rotatably connected to said clamping ring, said backplate having a base and a notch within said base, said base having a front surface and a rear surface, said method comprising the step of rotating said sphere around said base of said backplate such that said dowel rests within said notch and said sphere rests against said rear surface of said base.
Dependencies are inferred from the claim text.