Abstract: An auto-focus projection system includes a light valve, a projecting lens, a camera module, a processing circuitry, and a focusing adjustment assembly. The light valve converts an illumination beam into an image beam, and the projection lens projects the image beam. The projection lens forms different images with respective sharpness values at different focusing positions The camera module captures the different images and converting the different images into electrical signals. The processing circuitry receives the electrical signals and compares the sharpness values to generate a control signal. The focus adjustment assembly receives the control signal and moves the projection lens according to the control signal.

Abstract: A position adjusting device includes a base unit with spaced-apart first and second lateral plates. A bracket is elongated and interposed between the first and second lateral plates for mounting an integration rod, and includes opposite first and second open ends. A connecting mechanism includes two resilient pins connected respectively between the bracket and the first lateral plate and between the bracket and the second lateral plate. The resilient pins are proximate to the first open end of the bracket. An adjusting member extends through the first lateral plate, and abuts against one side of the bracket proximate to the second open end. The adjusting member drives the bracket to move along a first axis and a second axis perpendicular to the first axis. The first and second axes are perpendicular to an extension direction of the bracket.

Abstract: A position adjusting device includes a base unit with spaced-apart first and second lateral plates. A bracket is elongated and interposed between the first and second lateral plates for mounting an integration rod, and includes opposite first and second open ends. A connecting mechanism includes two resilient pins connected respectively between the bracket and the first lateral plate and between the bracket and the second lateral plate. The resilient pins are proximate to the first open end of the bracket. An adjusting member extends through the first lateral plate, and abuts against one side of the bracket proximate to the second open end. The adjusting member drives the bracket to move along a first axis and a second axis perpendicular to the first axis. The first and second axes are perpendicular to an extension direction of the bracket.

Abstract: A lamp receptacle assembly includes a receptacle body including first and second body parts having confronting peripheral edges fastened together to define a lamp chamber for receiving a lamp unit therein. The receptacle body is formed with a vent unit for ventilation of the lamp unit. At least one net unit covers the vent unit to prevent the broken pieces from scattering within the projection apparatus.