Radiant energy – Irradiation of objects or material – Irradiation of semiconductor devices
Patent
1989-06-09
1990-02-06
Berman, Jack I.
Radiant energy
Irradiation of objects or material
Irradiation of semiconductor devices
2504531, H01J 3720
Patent
active
048990590
ABSTRACT:
A mechanical scanning system for a batch ion implanter includes a disk for mounting wafers at sites near its periphery and a disk drive assembly for rotating the disk. The disk and the disk drive assembly are supported in an end station vacuum chamber by a scan arm which extends through a sealed opening in an access door. A scan drive assembly attached to the access door scans the scan arm and the disk in an arc-shaped path. Simultaneous rotation and scanning of the disk cause the ion beam to be distributed over the surfaces of the wafers mounted on the disk. A pivot drive assembly rotates the scan arm and the disk about a pivot axis between an implant position and a load/unload position. The implant angle can be changed without opening or venting the vacuum chamber by loosening the attachment of the scan drive assembly to the access door and rotating the scan drive assembly, the scan arm and the disk about the pivot axis. The access door can be moved on rails to an open position for access to the disk.
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Freytsis Avrum
Hertel Richard J.
Mears Eric L.
Berman Jack I.
Cole Stanley Z.
Dooher Terrence E.
Fisher Gerald M.
Varian Associates Inc.
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