Condenser and the production method thereof

An apparatus for producing a condenser element by rolling up a condenser element material including a positive foil sheet, a negative foil sheet and an isolating sheet placed one on another in combination, each of said positive foil sheet and said negative foil sheet having a plurality of preattached lead terminals with a predetermined space provided therebetween, said apparatus comprising:

• a rolling up shaft rotated in one direction to run said condenser element material supplied thereto at a predetermined constant speed;
• a servo-motor rotated in a direction opposite to the rotating direction of said rolling up shaft, said servo-motor being controlled to rotate with a predetermined constant torque;
• and
• a drive roller operatively connected to said servo-motor, said servo-motor applying said predetermined constant torque to said drive roller, causing the drive roller to be rotated thereby in the direction opposite to the rotating direction of said rolling up shaft, said drive roller being pressed against the outer surface of said condenser element material to cooperate with said rolling up shaft to substantially eliminate a tension applied to a preceding wrap of rolled up condenser element material as said condenser element material is rolled up, thereby to prevent said condenser element material from being irregularly tightened, so that said plurality of lead terminals may be arranged circumferentially in a same phase and diametrically in alignment.

A condenser element, comprising:

• a condenser element material including a positive foil sheet, a negative foil sheet, and an isolating sheet placed one on another in combination;
• and
• a plurality of lead terminals preattached on said positive foil sheet and on said negative foil sheet with a predetermined space provided between said lead terminals,
• said condenser element material rolled up at a constant speed in a plurality of wraps of said condenser element material, said wraps being substantially tension free so that said condenser element material, which is tensioned prior to being rolled up, is prevented from being irregularly tightened as it is rolled up and said plurality of lead terminals are substantially arranged circumferentially in a same phase and diametrically in alignment.