| 摘要 |
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.
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