Patent attributes
A projection device, having an optical engine device and an adjusting device is provided. The optical engine device has an optical engine and a fixing device coupled to the optical engine. A first thread hole is formed in the optical engine along a Z-axis direction. An image is projected parallel to the Z-axis. The adjusting device further has an adjusting frame in which a second thread hole is formed along the Z-axis direction and an adjusting bolt screws through the second thread hole and the first thread hole. The operation of the adjusting bolt, the fixing device as well as the optical engine is moved relatively to the adjusting frame along the Z-axis. Thereby, the optical engine has a built-in adjustment mechanism to ensure the focal length maintained as the design value after assembly, such that the image quality of the projection device is enhanced.
