Patent ID: 8443985
Filing Date: 2013-05-21
Classification: B41J,Y10T

Abstract:
1. A recording apparatus comprising: a recording head configured to discharge an ink; a negative pressure unit configured to store the ink which is supplied to the recording head and collect the ink which is not discharged from the recording head; a tube configured to transport the ink from the recording head to the negative pressure unit, wherein (i) an inner wall surface of the tube is made of a material which does not have a hydrophobic group, and (ii) three-dimensional mountain and valley portions are formed on the inner wall surface of the tube, along a moving direction of the ink in a periodically repeated manner at a predetermined spatial frequency; and a filter provided at an end portion on a recording head side of the tube, wherein an opening diameter of the filter is R, and one period of the spatial frequency is within a range from R to √{square root over (2)}·R and a minimum height of the mountain portions is equal to or greater than √{square root over (2)}·R/2.