| 摘要 |
1463195 Piezoelectric positioning devices THOMSON-CSF 26 March 1974 [27 March 1973] 13453/74 Heading H2A A piezoelectric positioning component comprises a member 20 made of material of high elastic modulus, e.g. steel, and having two blocklike parts 201, 202 and two thin flat connecting parts 203, 204, and, between the parts 201, 202, both a means for producing and adjusting a prestress tending to force the parts 201, 202 apart, and also a stack of piezoelectric discs 22 which may be energized to either force the parts 201, 202 apart or to allow them to move closer together. In the arrangement shown, the stack 22 is sandwiched between two end pieces 21, 23, the latter having a wedge shaped surface which engages two matching faces of two spacer members 24, 25 contacting the part 202. A pre-stress is applied to the member 20 by adjusting a screw 26 in threaded bore-holes in the members 24, 25, the movement of the members 24, 25 relative to the wedge surface of the end piece 23 causing a greater or lesser axial stress to be produced. The stack 22 may be energized to produce small expansions/contractions, e.g. of the order of microns as in an interferometer, Fig. 3, wherein a positioning component 37 is used to finely adjust a trolley 36 and mirror 363 relative to a trolley 32, the latter being coarsely adjustable relative to a bed 31 via a screw and nut system 34, 341, 35. In the arrangement of Fig. 4 (not shown), a plate (42) moves on a fixed track (43) under the control of a component (37) and a screw and nut system. In the arrangement of Fig. 5 (not shown), a plate (52) is moved coarsely by a screw and nut system, and finely by a piezoelectric positioning component (37).
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