Abstract: A positioning apparatus for a printer. The positioning apparatus includes at least one encoder, an OPC belt, and a code strip consisting of a reference bar code region, a blank region and a normal bar code region. The OPC belt is moved relative to the encoder and has a joint region. The code strip is mounted on the OPC belt and has multiple of bar codes. The encoder is used for detecting the bar codes and generating a displacement signal representing a displacement of the OPC belt moved relative to the encoder. The blank region may adjoin the joint region. Therefore, a home position can be located precisely by the displacement signal due to the existence of the reference bar code region and blank region.

Abstract: An encoder signal compensation method and the apparatus thereof are described. The encoder signal compensation method includes the following steps. First, encoder output signals are read to calculate compensation parameters. Subsequent encoder output signals are compensated according to the calculated compensation parameters and the compensated encoder output signals are utilized to control a printing process. The encoder signal compensation method is effective in eliminating width errors and phase errors of the encoder output signals. Another embodiment of the invention is to provide a printing apparatus utilizing the encoder signal compensation method to reduce high frequency banding, effectively improving the printing quality.

Abstract: An encoder signal compensation method and the apparatus thereof are described. The encoder signal compensation method includes the following steps. First, encoder output signals are read to calculate compensation parameters. Subsequent encoder output signals are compensated according to the calculated compensation parameters and the compensated encoder output signals are utilized to control a printing process. The encoder signal compensation method is effective in eliminating width errors and phase errors of the encoder output signals. Another embodiment of the invention is to provide a printing apparatus utilizing the encoder signal compensation method to reduce high frequency banding, effectively improving the printing quality.