Patent ID: 8403471

Claim:
A defoaming mechanism that is used for eliminating air bubbles from a liquid, the defoaming mechanism comprising: a liquid supply path which supplies the liquid; a defoaming chamber that has a side wall extending in the vertical direction and is used for capturing the air bubbles contained in the liquid; and a communication portion that allows the defoaming chamber and the liquid supply path to be communicated with each other, the communication portion connected to the side wall or a bottom face of the defoaming chamber, the communication portion having a first slope extending upward toward the side wall or the bottom face from a bottom face of the liquid supply path and a second slope extending upward toward the side wall or the bottom face from a top face of the liquid supply path opposed to the bottom face of the liquid supply path, the communication portion having a first portion that is connected to the defoaming chamber and a second portion that is connected to the liquid supply path, wherein a cross-section of the first portion is smaller than a cross-section of the second portion.