DRIVE MECHANISM AND IMAGING DEVICE USING SAME
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Abstract
A drive mechanism and an imaging device according to the present invention each include: an ultrasonic linear actuator 4 provided with a rod 42 that moves reciprocally in response to expansion/contraction of a piezoelectric element 41 and a first group unit 2 serving as an example of a moving body that engages with the rod 42 with a prescribed frictional force. The moving body (first group unit 2) is provided with a holding member 24, a pressing member 30 or other member that engages with the rod 42 in such a way that fluctuation in the frictional force is suppressed, and drive performance is stabilized. As a consequence, the drive mechanism and the imaging device according to the present invention can suppress fluctuation in the frictional force (gripping force) of the moving body in the ultrasonic linear actuator 4, making it possible to stabilize drive performance.
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Citations
36 Claims
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1-14. -14. (canceled)
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15. A drive mechanism comprising:
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an ultrasonic linear actuator including a piezoelectric element and a rod which is connected to one end of the piezoelectric element and which moves reciprocally with expansion and contraction of the piezoelectric element in an axial direction thereof; and a moving body that engages with the rod with a prescribed frictional force so as to move in the axis direction of the rod, wherein the moving body includes a moving body main portion, and a pressing member which faces the moving body main portion and grips the rod between the pressing member and the moving body main portion, and the pressing member is an oscillatable plate spring member including;
one end which is a pressing portion to press the rod;
a substantially middle portion which engages with the moving body main portion; and
the other end serving as a receive portion which receives a reactive force generated by the pressing portion pressing the rod after contacting the moving body main portion. - View Dependent Claims (16, 17, 18, 19, 28, 29)
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20. A drive mechanism, comprising:
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an ultrasonic linear actuator including a piezoelectric element and a rod which is connected to one end of the piezoelectric element and which moves reciprocally with expansion and contraction of the piezoelectric element in an axial direction thereof; and a moving body that engages with the rod with a prescribed frictional force so as to move in the axis direction of the rod, wherein the moving body includes a moving body main portion, and a pressing member which faces the moving body main portion and grips the rod between the pressing member and the moving body main portion, and a contact portion of the moving body main portion with respect to the rod includes two sets of a pair of contact pieces which are disposed with an interval in a circumferential direction of the rod, these sets being disposed with an interval in the axis direction of the rod. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 36)
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Specification