Patent ID: 7938592

Claim:
A writing implement provided with a housing, a pen tip attached to a front end of the housing, an ink tank formed inside the housing, an ink guide member guiding ink inside the ink tank to the pen tip, and an air passage formed between the ink tank and the pen tip in the housing and having one end connected to an end of the ink tank at the pen tip side and another end connected to the outside of the housing, wherein the inside of the ink tank is divided by partition walls into a plurality of ink chambers arranged in the longitudinal direction, and the ink in these ink chambers is guided from the ink chambers close to the pen tip successively to the pen tip by the ink guide member, a substantially uniform clearance provided around the entire circumference between the outer circumferential surface of each partition wall and the inner circumferential surface of the ink tank, and the ink is held inside the ink chambers by a ring-shaped ink film formed in the clearance, while air is made to flow into the ink chambers through the clearances.