Print head of a printer, printer and printing method

The invention relates to a microfluid print head (6) of a printer (1) characterised in that the head (6) comprises a distal face (19) and: - at least one first channel referred to as injection channel(14) for injecting an ink onto a substrate (40), the injection channel (14) leading onto the distal surface (19) by a first opening referred to as injection opening; - at least one second channel referred to as suction channel (15) for sucking up the ink, among others, the suction channel (15) leading onto the distal face (19) by a second opening referred to as suction opening; - a groove definedon the distal face (19) and into which the suction opening leads; and - at least one light source (9) or optical waveguide (17) for transmitting the light emitted by a light source (9). 本发明涉及印刷机(1)的微流体印刷头部(6)，其特征在于，该头部(6)包括远端面(19)以及：-被称为注射通道的至少一个第一通道(14)，该至少一个第一通道用于将墨水注射到基板(40)上，注射通道(14)通过被称为注射开口的第一开口通至远端表面(19)上；-被称为抽吸通道的至少一个第二通道(15)，该至少一个第二通道用于抽吸墨水，其中，抽吸通道(15)通过被称为抽吸开口的第二开口通至远端面(19)上；-凹槽，该凹槽被限定在远端面(19)上，并且抽吸开口通至该凹槽中；以及-至