Image forming apparatus

An image forming apparatus for ejecting a recording fluid constituted by a plurality of inks from a common ink ejection port while a mixing ratio of the plurality of inks is changed with respect to one pixel based on an image signal, and transporting the recording fluid to an image receiving medium which is moved with respect to the ink ejection port to form an image;

• said image forming apparatus comprising:
• an ink ejection port for ejecting the recording fluid to the image receiving medium;
• a first ink channel for supplying an image non-forming ink to said ink ejection port, the image non-forming ink being an ink for forming no image after dried out;
• a second ink channel for supplying an image forming ink to said ink ejection port, the image forming ink being an ink for forming the image after dried out;
• and
• a mixing section disposed upstream of said ink ejection port, for mixing the image non-forming ink supplied from said first ink channel and the image forming ink supplied from said second ink channel;
• wherein an opening area Ai of said second ink channel is smaller than the opening area of said first ink channel in said mixing section;
• and the opening area Ai of said second ink channel has the following relationship with a minimum ejection volume Vi of the image forming ink:ps
• Ai≦1.2×Vi(⅔).