Thermographic print head
Thermographic print heads have a layer giving protection against abrasion which is conventionally 10 to 15 mu m thick. According to the invention, the protective layer (6) consists of a rigid material with a much longer service life than the layers hitherto conventional. As a result, the layer thick...
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Main Authors | , |
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Format | Patent |
Language | English German |
Published |
05.02.1987
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Edition | 4 |
Subjects | |
Online Access | Get full text |
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Summary: | Thermographic print heads have a layer giving protection against abrasion which is conventionally 10 to 15 mu m thick. According to the invention, the protective layer (6) consists of a rigid material with a much longer service life than the layers hitherto conventional. As a result, the layer thickness can be reduced to a fraction of the previous thickness. The protective layers are in many cases sensitive to temperatures above 400 DEG C. With the pulsed driving of the heating elements (9) over a predetermined duration which has hitherto been conventional, unnecessarily high peak temperatures arise. The pulsed driving is thus replaced by driving with a sequence of pulses, as a result of which the peak temperatures that have arisen hitherto are avoided. |
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Bibliography: | Application Number: DE19853527040 |