Abstract: The invention relates to a printing chip for a printing head working according to the ink-jet printing principle, having at least one recess forming a medium chamber in the printing chip, a deflectable diaphragm forming one wall of the medium chamber, a duct opening in the medium chamber for feeding a liquid medium that is to be squirted out hot, and having a squirting-out opening connected to the medium chamber, which printing chip is distinguished by the fact that the printing chip (2) is produced exclusively from monocrystalline silicon.

Abstract: In a serial recording device (10) with a recording head (12), movable back and forth perpendicular to the feed direction (17) of a recording substrate (18), the recording head (12) performs a recording both during the forward motion (28) as well as during the return motion (32) in a bidirectional printing. For obtaining a good recording result, it is is required that the relative position of the grid pattern, generated during the forward motion (28), coincides with and matches the grid pattern, generated during the return motion (32) of the recording head. During a test recording process, a first test pattern (31) is recorded initially at least once during the forward motion (28), and then a second test pattern (33) is recorded at least once during the return motion (32) for a balancing of the relative position.

Abstract: An improved electrothermal ink print head has a sandwich-type construction in which the propagating direction of the electrothermally-produced steam bubble is opposite to the direction of ink discharge onto a print medium or substrate. To improve efficiency and reduce the reciprocal influence of adjacent ink ducts, the side of the chip 11 facing the ink supply vessel 12 is provided with a cover plate 1. At the points of intersection of the ink ducts 16 and supply conduits 15, the cover plate 1 includes openings 2 whose cross-sectional extents or areas are predeterminately related to the intersecting ducts and conduits. In a first variation, the cover plate 1 is formed of glass or ceramic and is anodically bonded on the chip. In a second variation, the cover plate 1 is fabricated of a plastic foil that is laminated on the chip 11 and is adhesive on both its opposite surfaces. In a third variation, the cover plate 1 is formed of a metal foil that is anodically bonded to the chip 11.

Abstract: A replaceable ink reservoir for an ink printer [means comprises a means to] prevent unauthorized refilling and includes[. This means can be composed of] a magnetic contact element [(13)] arranged in the ink reservoir or [can be composed of] a clack valve arranged in the delivery region of the ink reservoir.