| 摘要 |
An assembly comprising a plurality of thermal heads (10), each thermal head comprising a linear array of resistor elements mounted on a flat substrate (17), and a drum (15) of diameter D mm for supporting a thermographic recording material, said thermal heads being mounted in a staggered fashion in at least two parallel rows (11,12) in which the linear arrays of resistor elements are parallel to one another, characterized in that: i) said resistor arrays of adjacent rows of thermal heads are separated by a spacing, d, greater than 0.2 mm; and ii) said substrates of thermal heads in adjacent rows (17', 17'') include an angle THETA comprised between arc sine (d/2D) and arc sine (2d/D); and a direct thermal printing process therewith.
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