A cut alignment device for a rotary saw having a motor which spins a cutting unit which includes a rotary shaft driven by the motor, a circular blade having a central aperture through which the shaft fits, and a blade mounting device for holding the blade on the shaft. A film deposition process is then performed to form a dichroic film on the patterned material layer and the substrate. By using the data buses 17, 18, it is possible to attain, at a high rate of speed, such calculation processing that requires data supplied from outside. After the candle hardens sufficiently, the candle with the tube mounted therein is removed from the mold.