Patent ID: 8871027

Claim:
A vacuum deposition source comprising: a base flange configured to mount the vacuum deposition source to a vacuum chamber, the base flange comprising an electrical power feed-through; a crucible operatively supported relative to the base flange and configured to hold vacuum deposition material, the crucible comprising a body portion and an effusion orifice; a heater operatively supported relative to the base flange and at least partially surrounding the crucible, the heater comprising a cylindrically curving electrical contact surface; and an electrical contact assembly comprising a power strap electrically connected to the electrical power feed-through at a first end of the power strap, electrically connected to the electrical contact surface of the heater at a second end of the power strap, and comprising a conductive washer in contact with the cylindrically curving electrical contact surface, the power strap positioned between a contact washer and the conductive washer, a pressure pin in contact with the contact washer, a first surface of a pyrolytic boron nitride spring in contact with the pressure pin, and at least one loading pin in contact with a second surface of the pyrolytic boron nitride spring thereby providing a compressive load on the conductive washer.