Patent ID: 7942489

Claim:
A liquid emitting apparatus including a plurality of liquid chambers for storing liquid arrayed in a line print head wherein each liquid chamber includes two or more pressure generating elements provided in said liquid chamber for pressurizing the liquid stored in said liquid chamber, an emitting port for emitting the liquid pressurized by said pressure generating elements in the form of liquid droplets, and an emission control circuit for varying a current value supplied to at least one of said pressure generating elements relative to one of the other pressure generating elements to thereby control an angle of emission of said liquid droplets from said emitting ports; wherein with a non-zero current supplied to one of said pressure generating elements as a reference current, said emission control circuit supplies a current substantially equal to said reference current or a current having a current value difference less than ±10% from said reference current, to one or more of the pressure generating elements other than the pressure generating element supplied with said reference current, and further wherein none of the liquid chambers in the line print head has a pressure generating element that receives a current having a current value difference that is greater than 10% from the corresponding reference current, and further comprising circuitry for limiting a current value difference to less than 10% for all ejecting elements of the liquid emitting apparatus for all ink ejection operations.