Actuating apparatus and projector

A projector comprising an illumination system, an optical engine assembly, a projection lens, and an actuating apparatus, wherein:

• the illumination system is configured to provide an illumination light beam;
• the optical engine assembly is configured to convert the illumination light beam into an image light beam;
• the projection lens is configured to project the image light beam outside the projector;
• and
• the actuating apparatus is disposed between the optical engine assembly and the projection lens to allow the image light beam to pass through, and the actuating apparatus comprises a frame body, an optical element, a light-transmitting element, and a drive assembly, wherein:
• the frame body comprises a first frame portion, a second frame portion, and a shaft portion, the first frame portion is connected to the second frame portion through the shaft portion, the second frame portion has a through hole, the through hole has a first opening and a second opening, and the first frame portion is located in the first opening;
• the optical element is disposed on the first frame portion and is located in the first opening;
• the light-transmitting element is disposed on the second frame portion and is located in the second opening to seal the second opening, wherein the image light beam sequentially passes through the optical element located in the first opening and the light-transmitting element located in the second opening, wherein the second frame portion and the light-transmitting element seal an opening at a light-emitting side of the optical engine assembly;
• and
• the drive assembly is disposed on the frame body, and the drive assembly drives the first frame portion to rotate with the shaft portion as an axis of rotation, such that the first frame portion drives the optical element to oscillate back and forth relative to the second frame portion.