Patent ID: 7651189
Filing Date: 2010-01-26
Classification: B41J

Abstract:
1. A liquid-ejection testing method, comprising: making conductive first detection members and conductive second detection members opposed, in a non-contact state, to a liquid ejecting nozzle that is to be tested; ejecting a charged liquid from the liquid ejecting nozzle; acquiring a first peak value from an induced current generated at the first detection members by the liquid that has been ejected from the liquid ejecting nozzle; acquiring a second peak value from an induced current generated at the second detection members by the liquid that has been ejected from the liquid ejecting nozzle; checking whether or not a difference between the first peak value and the second peak value is within a predetermined tolerance range; judging that ejection of the liquid is properly performed for the liquid ejecting nozzle in case that the difference is within a predetermined tolerance range; and judging that ejection of the liquid is not properly performed for the liquid ejecting nozzle in case that the difference is not within the predetermined tolerance range; wherein the first detection members and the second detection members are disposed in a direction that intersects with a direction in which liquid ejecting nozzles are arranged; wherein the first detection members constitute a first comb and the second detection members constitute a second comb; wherein the first comb and the second comb are meshed with each other; wherein one of the first detection members and one of the second detection members are used to judge whether or not ejection of the liquid is properly performed for a certain liquid ejecting nozzle; and wherein the one of the first detection members and another one of the second detection members are used to judge whether or not ejection of the liquid is properly performed for another liquid ejecting nozzle.