Patent ID: 6966641

Claim:
An ink reservoir of an ink jet recording apparatus, the ink jet recording apparatus comprising: an ink jet head; the ink reservoir attached to the head and containing an ink absorbing member which stores an ink supplied to the head; pressure reduction means, connected to the ink reservoir at a specific timing, for reducing an internal pressure of the reservoir; and an ink tank containing the ink replenished into the ink reservoir by a pressure reduced state caused by the pressure reduction means connected to the ink reservoir at the specific timing, the ink jet recording apparatus discharging the ink from the ink jet head by a specified amount and performing an ink filling operation after the ink is replenished into the ink reservoir using the pressure reduction means and the ink tank, the ink reservoir comprising: an absorbing member arrangement area in which the ink absorbing member is arranged; and an absorbing member non-arrangement area that is a space in which the ink absorbing member is not arranged and that temporarily stores the ink, wherein if an ink discharge amount that is the specified amount by which the ink is discharged is V 1 , a volume of the absorbing member non-arrangement area is V 2 , and a volume of the area in the ink reservoir which stores the ink right after the ink is supplied is V 3 , then the volumes V 1 , V 2 , and V 3 fall within ranges of V 3 ≦20V 1 and 0.7V 1 ≦V 2 ≦V 1 .