Transparent rotating device and projection device

A projection device, comprising:

• an illumination system adapted to provide an illumination beam;
• at least one light valve disposed on the transmission path of the illumination beam for converting the illumination beam into an image beam;
• a projection lens having an incident end and disposed on the transmission path of the image beam;
• and
• a transparent rotating device comprising a shaft, a transparent rotating assembly and a motor, wherein
• the transparent rotating assembly is disposed on the transmission path of the image beam and is connected to the shaft, and the transparent rotating assembly comprises at least one first transparent sheet and at least one second transparent sheet that are annularly and alternatively arranged around the shaft;
• and
• the motor is connected to the shaft and is adapted for driving the shaft to rotate the transparent rotating assembly, wherein the at least one first transparent sheet and the at least one second transparent sheet sequentially enter the transmission path of the image beam, an angle at which the at least one first transparent sheet is inclined with respect to the shaft is different from an angle at which the at least one second transparent sheet is inclined with respect to the shaft, the image beam penetrates the at least one first transparent sheet to be deflected and transmitted to a first position on the incident end, and the image beam penetrates the at least one second transparent sheet to be deflected and transmitted to a second position on the incident end.