| 摘要 |
<p>An engraving head apparatus (figure 1) and method for engraving a gravure cylinder (24). The engraving head apparatus (figure 1) including a magnetostrictive actuator (figures 7A-7D) formed from TERFENOL-D which elongatably drives a diamond-tipped stylus arm (92 in figure 6) in a reciprocal manner in response to a varying magnetic field (Ho in figure 8) created by a bias coil (56) and a drive coil (54). The bias coil (56) establishes a DC biasing magnetic field which causes an initial expansion of the actuator (52) to approximately one-half the total linear expansion limit of the actuator (52). The drive coil (54) is concentrically interposed between the actuator (52) and the bias coil (56) and modulates the magnetic field intensity established by the bias coil (56) to cause additional expansion and contraction of the actuator (52) about the initial expansion point.</p> |
