Abstract: A composite system includes first and second devices, each operated using its own power source device as a driving source. The system comprises a signal line connecting loads of the first and second devices so that the first and second devices operate in cooperation with each other; and a power source line connecting a first line connecting the first power source device and the load of the first device via a diode and a second line connecting the second power source device and the load of the second device via a diode so that the first and second devices can operate using the power source device of the counterpart device as the drive source.

Abstract: In an ink jet printer, ink ejection beyond the printing medium is reduced when performing printing without leaving a space along at least one of the edges of the printing medium. For this purpose, performance of data processing in the process of image processing relating to the image data of the marginless edge portion reduces a printing density of the area to lessen an ink application amount to the edge portion. For example, data processing is performed in such manner that a predetermined coefficient smaller than 1 is multiplied by the image data of the area.

Abstract: In an ink jet printer, an ink ejection beyond the printing medium is reduced when performing a printing without leaving a space along at least one of edges of the printing medium. For this purpose, a performance of data processing in the process of an image processing relating to the image data on the edge portion without leaving the space and reduces a printing density of the area to lessen an ink application amount to the edge portion. For example, data processing is performed in such manner that a predetermined coefficient smaller than 1 is multiplied by the image data of the area.

Abstract: A composite system includes a first and a second devices operated with taking an own power source device as a driving source. The system comprises a signal line connecting loads of the first and second devices so that the first and second devices operate in cooperation with each other; and a power source line connecting a first line connecting the first power source device and the load of the first device via a diode and a second line connecting the second power source device and the load of the second device via a diode so that the first and second devices can operate with taking the power source device of the counterpart device as the drive source.

Abstract: The present invention provides a printing apparatus and a method of controlling the same which can minimize power consumption and improve operability by performing a control according to a setting circumstance of a printing medium. To realize this, the printing apparatus comprises a detection means for detecting whether the printing medium is set and a control means for setting and/or canceling the print mode according to a result of detection by the detection means.