Fixing base and projection device

A projection device, comprising an illumination system, a light combining element, a light valve and a projection lens, and the light combining element comprising at least one optical element, at least two elastic members and a fixing base, wherein:

• the fixing base is used for fixing the at least one optical element comprising an optical axis and for disposing the at least two elastic members, and the fixing base comprises a fixing groove and an elastic member fixing groove, wherein:
• the fixing groove is configured to dispose the optical element, the fixing groove comprises a first end, a second end, and an abutting surface, and the fixing groove is formed by extending from the first end to the second end;
• and
• the elastic member fixing groove is formed by extending from a first fixing end to a second fixing end;
• and
• wherein each of the at least two elastic members comprises an urging part and a supporting part, the supporting part abuts against an inner surface of the elastic member fixing groove to provide the urging part with a push force toward the optical element, so that the optical element abuts against the abutting surface,
• wherein an opening direction of the fixing groove and an opening direction of the elastic member fixing groove are nonparallel to a direction of the optical axis, and the at least two elastic members and the optical element are respectively disposed in the elastic member fixing groove and the fixing groove along a direction nonparallel to the direction of the optical axis,
• wherein the illumination system is used for providing an illumination beam, the light combining element is disposed on a transmission path of the illumination beam so that the illumination beam passes through the light combining element, the light valve is used for forming an image beam, and the projection lens is disposed on a transmission path of the image beam.