Patent ID: 7387354
Filing Date: 2008-06-17
Classification: B41J

Abstract:
1. A waveform determining device comprising: a measuring unit that measures a viscosity and a mass of a droplet ejected from an ejecting head for ejecting a droplet in accordance with a drive waveform; a table memory that stores a table, the table including a plurality of voltage drop amounts and a plurality of waveform types, each waveform type identifying a duration of a voltage drop and corresponding to a viscosity, each voltage drop amount corresponding to a mass of a droplet; and a waveform determining unit that determines a drive waveform to be supplied to the ejecting head, the drive waveform having a voltage drop, the voltage drop amount being determined on the basis of the table in response to the mass of the droplet measured by the measuring unit, the duration of the voltage drop being determined on the basis of the table in response to the viscosity of the droplet measured by the measuring unit, the drive waveform causing ejection of a droplet of an approximately constant volume from the ejecting head.