Patent ID: 8256856

Claim:
A liquid droplet jetting apparatus which jets liquid droplets, comprising: a nozzle which jets the liquid droplets in a plurality of types of jetting modes; a liquid droplet jetting head which includes the nozzle; a signal generating section which generates a plurality of types of jetting signals, where each jetting signal; is formed of bit data; has predetermined bits not less than three bits; and corresponds to one of the plurality of types of jetting modes; and a signal supply section which serially outputs the bit data forming one of the jetting signals to the liquid droplet jetting head at each of jetting timings of the nozzle; wherein the jetting signals are set such that the jetting signals corresponding to the jetting modes respectively are subjected to binary switching of the bit data at frequencies decreasing proportional to usage frequencies of the jetting modes when the bit data are outputted serially from the signal supply section to the liquid droplet jetting head; wherein the plurality of types of jetting signals includes: a first jetting signal corresponding to a jetting mode having the highest usage frequency among the jetting modes; a second jetting signal corresponding to a jetting mode having a second highest usage frequency among the jetting modes; and a third jetting signal corresponding to a jetting mode having a third highest usage frequency among the jetting modes; wherein, in the first jetting signal, each bit of the bit data has a same value; wherein, in the second jetting signal, a value of a first serially transmitted bit and a value of a last serially transmitted bit are different, and the binary switching occurs only once when the bit data of the second jetting signal is outputted serially; and wherein, in the third jetting signal, a value of a first serially transmitted bit and a value of a last serially transmitted bit are different, the binary switching occurs only once when the bit data of the third jetting signal is outputted serially, and the value of the first serially transmitted bit coincides with the value of the last serially transmitted bit of the second jetting signal.