Patent ID: 7967961

Claim:
A film forming apparatus comprising: a circular or polygonal cylindrical rotating body which is rotatably around a horizontal axis provided in a film forming chamber the pressure of which can be controlled; a rotating body driving means for rotationally driving the cylindrical rotating body; a first sputter film forming means provided so as to face the outer surface side of the cylindrical rotating body; a second sputter film forming means provided so as to face the inner surface side of the cylindrical rotating body; a substrate tray on which a substrate is placed so that the edge portions of the substrate are held and the top surface and the back surface of the substrate are exposed; a substrate holder which is provided in an opening formed in the peripheral surface of the cylindrical rotating body to detachably hold the substrate tray so that the top surface and the back surface of the substrate are exposed; and means for securing releasably holding the substrate holder magnetically which encounters the inner circumferential surface of the cylindrical rotating body and which holds the substrate onto the inner circumferential surface of the cylindrical rotating body; wherein a film is formed on the top surface of the substrate on the substrate tray held on the substrate holder by using the first sputter film forming means, and a film is formed on the back surface of the substrate on the substrate tray held on the substrate holder by using the second sputter film forming means, in the film forming chamber the pressure of which is controlled, while the cylindrical rotating body is rotated by the driving of the rotating body driving means.