Device and method for transporting wafer-shaped articles
An apparatus for treating wafer-shaped articles includes at least one linear arranged array of a plurality of at least two process units wherein in each such process unit one single wafer-shaped article can be treated, a cassette-holding unit for holding at least one cassette storing at least one wafer-shaped article therein and a transport system for picking a wafer-shaped article from a cassette and placing it into one of a process unit. The apparatus has a transport unit movably mounted on a linear track. The transport unit includes at least one holding member for holding a single wafer-shaped article in a substantially vertical plane parallel to the linear track.
1. Apparatus ( 1 ) for treating wafer-shaped articles, comprising:
a linear arranged process unit array of at least two process units ( 31 , 33 ), wherein in each said process unit only and exactly one single wafer-shaped article (Wm) can be treated at one time;
at least one cassette-holding unit ( 15 ), each cassette-holding unit for holding at least one cassette storing at least one wafer-shaped article therein;
a transport system for picking a held wafer-shaped article from the one cassette and placing the thus picked-up wafer-shaped article into one of the process units, the transport system comprising
i) at least one linear track ( 26 ) arranged parallel to the process unit array ( 31 , 33 ), the track for moving the picked-up single wafer-shaped article along a linear path parallel to the process unit array, and
ii) a transport unit ( 46 ) movably mounted on each of said at least one linear track ( 26 ), said transport unit comprising at least one holding means ( 46 a ) for holding the picked-up wafer-shaped article in a substantially vertical plane parallel to the linear track and moving the picked-up wafer-shaped article along a transport path defined by the linear track, wherein the transport unit ( 46 ) has a pivoting ( 66 ) mechanism for pivoting (P) the picked-up wafer-shaped article from a substantially vertical state to a substantially horizontal state to place the picked up wafer-shaped article in one of the process units;
a front unit comprising
i) an array of at least two of the cassette-holding units ( 15 ) for holding cassettes storing a plurality of the wafer-shaped articles, and
ii) a transfer unit ( 84 , 86 ) for transferring the wafer-shaped articles between the cassettes and the transport unit ( 46 ); and
at least one transfer station ( 22 ) for temporarily storing the picked up wafer-shaped article (Wt),
the transfer station being accessible by the transfer unit ( 84 , 86 ) and by the transport unit ( 46 ) movably mounted on the linear track,
wherein said transfer station further comprises a holding unit ( 42 ) with two holding devices ( 42 a , 42 b ) arranged in a back-to-back configuration.
2. Apparatus as claimed in claim 1 , wherein said transfer station ( 22 ) comprises a flip mechanism for flipping (Fv) the picked-up wafer-shaped article.
3. Apparatus as claimed in claim 1 , with a transport system comprising at least two of said at least one linear tracks ( 24 , 26 ).
4. Apparatus as claimed in claim 1 , wherein,
each process units ( 31 , 33 ) treats the only exactly one single wafer-shaped article (Wm) in a horizontal position, and
a transport path of the held wafer is narrower than a diameter of the held wafer.