Patent ID: 7673961
Filing Date: 2010-03-09
Classification: B41J

Abstract:
1. A method for inspecting a recording head including a plurality of electrothermal conversion elements and a temperature detection element disposed above or below each of the plurality of electrothermal conversion elements, the method comprising: driving the electrothermal conversion element; performing a second-order differentiation based on information on temperature detected by the temperature detection element; obtaining a timing at which a calculation result of the second-order differentiation changes from a positive value to a negative value; determining whether there is a change in slope of a temperature fall process in temperature detected by the temperature detection element during a predetermined time based on the timing; if it is determined that there is a change in slope of the temperature fall process, obtaining a timing of the change in slope; and determining whether ink is discharged normally based on the obtained timing of the change in slope and a predetermined timing of a change in slope of the temperature fall process.