Patent ID: 7803433

Claim:
An amorphous carbon film forming method of forming amorphous carbon films on surfaces of conductive plate-like workpieces by a plasma CVD method, comprising the steps of: arranging plural plate-like workpieces on a workpiece fixture, which provided in a film forming furnace to be connected to a negative electrode, in a state that the plate-like workpieces are stacked in parallel and adjoining workpieces have facing surfaces spaced from one another by an interval in the stacking direction of the plate-like workpieces; providing plasma power to the film forming furnace to produce a plasma in the film forming furnace and a sheath formed around each of said plate-like workpieces, wherein the sheath of each of said plate-like workpieces has a sheath width comprising the width of the sheath in the stacking direction; and controlling a processing gas pressure and a plasma power supply so that the sheath width becomes equal to or less than the interval between the facing surfaces of two adjoining plate-like workpieces.