Wafer transfer method using a serial number detecting device in

Details Wafer transfer method using a serial number detecting device in Wafer transfer method using a serial number detecting device in

1999-10-21

2000-11-21

Werner, Frank E.

Material or article handling

Process

Of emptying portable receptacle

414404, 414416, 414937, 414941, 414273, 118719, 235462, 901 47, 36447803, B65G 104

Patent

active

061493791

ABSTRACT:
A wafer transfer method of semiconductor fabricating equipment is capable of successively arranging a plurality of wafers in a designated order (e.g., an ascending order, a descending order, an odd/even number order or an individual selection order). The wafer transfer method uses a first cassette containing the wafers, and a second cassette for receiving the wafers. A wafer transfer robot having a wafer transfer arm moves the wafers from the first cassette to the second cassette, after the wafer serial numbers have been read and sent to a computer. The computer uses a selected wafer arrangement order to decide where within the second cassette each wafer from the first cassette should be placed and then controls the wafer transfer robot to place each wafer into the desired location. With the wafers arranged in the selected order, it is not necessary to test each wafer after each fabricating process. Instead, several wafers can selectively tested at suspected weak points, while changes in the properties of the fabricating processes can still be detected. Testing time is thereby saved, and productivity is improved.

REFERENCES:
patent: 5308222 (1994-05-01), Bacchi et al.
patent: 5975836 (1999-11-01), Rodriguez

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