Patent ID: 9539836
Date: 2017-01-10
CPC Classifications: B41J,C09D

Claim:
1. An image forming apparatus comprising: a head unit that ejects a droplet of ink toward a base member; and a movement mechanism for moving said base member relative to said head unit, wherein said head unit includes: a first ink ejection part that ejects a first ink, a droplet of which when deposited on said base member has a dynamic surface tension that decreases with time; and a second ink ejection part that ejects a second ink, a droplet of which when deposited on said base member has a dynamic surface tension that decreases with time, said second ink ejection part being provided downstream of said first ink ejection part in a conveyance direction in which said base member is conveyed relative to said head unit, said first ink and said second ink having different colors, wherein an absolute value of a difference between a dynamic surface tension of a droplet of said second ink when deposited on said base member and a dynamic surface tension of a droplet of said first ink that has been deposited on a position adjacent to said droplet of said second ink when said droplet of said second ink is deposited on said base member is smaller than an absolute value of a difference between the dynamic surface tension of the droplet of said first ink that has been deposited on the position adjacent to said droplet of said second ink when said droplet of said second ink is deposited on said base member and the dynamic surface tension of the droplet of said first ink when deposited on said base member, the droplet of said first ink that has been deposited on the position adjacent to said droplet of said second ink when said droplet of said second ink is deposited on said base member remains in the form of a liquid, and said first ink and said second ink have approximately a same static surface tension.