Endblock for rotatable target with electrical connection between collector and rotor at pressure less than atmospheric pressure
An endblock for a rotatable sputtering target, such as a rotatable magnetron sputtering target, is provided. A sputtering apparatus, including one or more such endblock(s), includes locating the electrical contact(s) (e.g., brush(es)) between the collector and rotor in the endblock(s) in an area under vacuum (as opposed to in an area at atmospheric pressure).
1. A sputtering apparatus comprising:
at least one endblock for supporting an end of a cylindrical rotatable sputtering target, the endblock including a fixed conductive collector and a rotatable conductive rotor for rotating with the cylindrical sputtering target during sputtering operations;
the endblock further including an electrical power transfer structure located between the fixed conductive collector and the rotatable rotor for allowing electrical power to be transferred from the collector to the rotor;
a first cooling area through which liquid flows for cooling the fixed conductive collector, the first cooling area being located around at least a portion of the fixed conductive collector and being substantially concentric with the fixed conductive collector;
a second cooling area, separate from the first cooling area, through which liquid flows for cooling the rotor and target, the second cooling area being at least partially surrounded by the rotor, and wherein the liquid in the second cooling area flows in at least a direction that is substantially parallel to an axis about which the target and rotor are to rotate;
wherein the electrical power transfer structure comprises a conductive brush that when viewed in cross section from a point of view perpendicular to the axis is located between at least the first and second cooling areas along a line drawn perpendicular to the axis, and wherein the brush is located closer to the axis than is the first cooling area;
wherein the liquid in the first cooling area flows around the axis about which the target and rotor are to rotate; and
wherein the electrical power transfer structure, the rotor, and the collector are each located in an area under vacuum having pressure less than atmospheric pressure during sputtering operations.
2. The sputtering apparatus of claim 1 , wherein the electrical power transfer structure is made up of one or more conductive brush(es).
3. The sputtering apparatus of claim 1 , where the entirety of the electrical power transfer structure and the entirety of the rotor are each located in the area under vacuum having pressure less than atmospheric pressure.
4. The sputtering apparatus of claim 1 , wherein the target is also to be located entirely in the area under vacuum having pressure less than atmospheric pressure.
5. The sputtering apparatus of claim 1 , wherein the entirety of the collector is located in the area under vacuum having pressure less than atmospheric pressure.
6. The sputtering apparatus of claim 1 , wherein an endblock support supports the endblock from a ceiling of a sputtering chamber of the sputtering apparatus.
7. The sputtering apparatus of claim 1 , wherein the liquid in the first cooling area does not mix with the liquid in the second cooling area.
8. The sputtering apparatus of claim 1 , wherein the liquid in the first cooling area comprises water.
9. The sputtering apparatus of claim 1 , wherein the liquid in the second cooling area comprises water.
10. The sputtering apparatus of claim 1 , wherein the endblock and target are mounted on a cathode revolver for selective movement and use in sputtering operations in the sputtering apparatus.
11. The sputtering apparatus of claim 1 , wherein a cooling liquid inlet and a cooling liquid outlet for the first cooling area are provided in or proximate said endblock, and wherein a cooling liquid inlet and a cooling liquid outlet for the second cooling area are provided in or proximate another endblock that is provided at an end of the target opposite the end at which said endblock including the collector is located.
12. The sputtering apparatus of claim 1 , wherein bearings rotatably supporting the rotor are located inboard of the brush and the first cooling area, so that when viewed from above the bearings are located between the brush and the sputtering target.
13. The sputtering apparatus of claim 1 , wherein the conductive brush is concentric with the first and second cooling areas.