Abstract: An ink jet system printer of the charge amplitude controlling type prints a desired symbol in a dot matrix fashion on a recording paper. Dots for forming a column of the dot matrix are formed in an up and down manner in order to increase the distance provided between two adjacent travelling ink droplets. When a first ink droplet is directed to a dot position higher than a dot position to which a following ink droplet is directed, the positions must be separated on the recording paper by at least a first deadzone of a first dimension. When a first ink droplet is directed to a dot position lower than a dot position to which a following ink droplet is directed, the positions must be separated on the recording paper by at least a second deadzone. The second deadzone is shorter than the first deadzone.

Abstract: An ink jet system printer includes a nozzle for emitting an ink liquid under a predetermined pressure, an electro-mechanical transducer secured to the nozzle for vibrating the nozzle in accordance with an excitation signal of a given frequency, thereby forming ink droplets at the given frequency, and a charging tunnel for charging the ink droplets in accordance with print information. A charge condition detection unit is provided for monitoring the charge condition of the ink droplets, the output signal of the charge condition detection unit being indicative of a droplet formation condition. When the output signal of the charge condition detection unit indicates the occurrence of satellite ink droplets in addition to the normal ink droplets, the voltage level of the excitation signal, which is applied to the electrode-mechanical transducer, is varied to eliminate the occurrence of the satellite ink droplets.

Abstract: A magnetic recording medium which comprises a base and a magnetic layer of a magnetic coating composition comprising magnetic particles and a binder provided on said base, characterized in that the magnetic coating composition further comprises a dialkylsulfosuccinate.