Patent ID: 7438377

Claim:
An ink jet recording apparatus, comprising: a plurality of nozzles each of which ejects a droplet of at least one sort of ink toward a recording medium and which are arranged in at least one array in a first direction; a plurality of pressure changing devices which correspond to the nozzles, respectively, and each of which changes a pressure of said at last one sort of ink to be supplied to a corresponding one of the nozzles so that said one nozzle ejects the droplet of said at least one sort of ink, wherein the pressure changing devices are grouped into two groups which are arranged in a second direction substantially perpendicular to the first direction; two flexible wiring cables which are electrically connected to the two groups of pressure changing devices, respectively, and which extend from the two groups of pressure changing devices in opposite directions, respectively, that are parallel to the second direction and away from each other; two driver circuits which are provided on, and electrically connected to, the two wiring cables, respectively, and each of which outputs respective drive signals to drive the respective pressure changing devices of a corresponding one of the two groups; and a heat sink including two heat-conducting side walls which are opposite to each other in the second direction, a portion of each one of the two side walls contacting a corresponding one of the two driver circuits, and a heat-conducting connection portion which extends in the second direction and connects between the two side walls.