Patent ID: 7108358

Claim:
A pressure buffer of an ink-jet recording apparatus, the pressure buffer being placed in a vicinity of or in an ink-jet recording head in an ink supply path connecting an ink container to the ink-jet recording head to alleviate a fluctuation in pressure of ink supplied from the ink container to the ink-jet recording head, the pressure buffer comprising: a body having a concave portion, a flexible film that is attached to the body to tightly close the concave portion, thereby forming a chamber; an ink flow inlet in which ink flows from the ink container to the chamber; and an ink flow outlet through which ink flows from the chamber to the ink-jet recording head, wherein, during use of the ink-jet recording apparatus, in a case where a surface of the flexible film is placed vertically to a horizontal surface, the ink flow outlet is always positioned in an uppermost portion in a vertical direction of the chamber, and the ink flow inlet is formed to be positioned at a same height or on a lower side in a vertical direction with respect to the ink flow outlet.