Patent ID: 6485147
Filing Date: 2002-11-26
Classification: G02B,G03B

Abstract:
A projection system capable of automatically adjusting focus, suitable for projecting the image from an image device to a projection plane, comprising:a total reflection element, having a total reflection plane, a first plane and a second plane, for emitting the image from the image device through the total reflection plane and the first plane; an optical projection device, moving from a start focus position to a final focus position to project the emitted image from the first plane to the projection plane at a focus position between the start focus position and the final focus position and emitting the image reflected by the projection plane through the first plane, the total reflection plane and the second plane; an image reader, reading the emitted image from the second plane; a server device, coupled to the optical projection device, driving the optical projection device to move from the start focus position to the final focus position and driving the optical projection device to the next focus position when receiving an adjustment signal; and an analysis system, coupled to the image reader and the server device, analyzing the read image from the image reader and outputting the adjustment signal to the server device according to the focus position resulting from the analysis to drive the optical projection device to the resulting focus position.