An operating device has a pair of linear members (43, 44) made of a shape memory alloy and contracting axially due to heat generated by electrification and generating tension in the contracting direction, a drive lever (19) supported to pivot about a pivot shaft (19a), a pair of drive rods (33, 34)
An operating device has a pair of linear members (43, 44) made of a shape memory alloy and contracting axially due to heat generated by electrification and generating tension in the contracting direction, a drive lever (19) supported to pivot about a pivot shaft (19a), a pair of drive rods (33, 34) respectively connected to both sides of the drive lever (19) with the pivot shaft (19a) being disposed between the sides of the drive lever (19), and a power supply circuit for selectively electrifying the linear members (43, 44). One end of each of the linear members (43, 44) is fixed to a stationary member, and the other end is connected to each of the drive rods (33, 34).
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The invention claimed is: 1. An operating device, comprising: a pair of linear members made of a shape memory alloy, and contracting axially due to heat generated by electrification and generating tension in the contracting direction; a movable member supported on a fixing member to be rotatable ab
The invention claimed is: 1. An operating device, comprising: a pair of linear members made of a shape memory alloy, and contracting axially due to heat generated by electrification and generating tension in the contracting direction; a movable member supported on a fixing member to be rotatable about a pivot shaft; a pair of drive rods respectively connected to both sides of the movable member with the pivot shaft being disposed between the sides of the movable member; and a power supply circuit for selectively electrifying the linear members, the linear members each having one end connected to the fixing member and the other end connected to the drive rod, the movable member repeatedly operating around the pivot shaft due to selective electrification of the power supply circuit, wherein the movable member comprises a locking unit for locking at rotation stop points in both directions around the pivot shaft, the locking unit including: a cam provided on the movable member, a locking arm having a base end pivotally supported on the fixing member and a leading end provided with a cam following roller which contacts with the cam slidingly, and an elastic member for urging the locking arm in a direction of pressing the cam following roller to the cam, the cam including: a one-side active surface a for applying force received from the cam following roller to the movable member swinging in one direction, and an other-side active surface for applying force received from the cam following roller to the movable member swinging in the other direction. 2. The operating device according to claim 1, wherein a single wire is bent to form the pair of linear members. 3. The operating device according to claim 1, further comprising a pair of lead portions formed in parallel with the linear members on a flexible printed board providing the power supply circuit of the operating device, wherein each of the lead portions has a leading end fixed on the drive rod and a base end fixed on the fixing member so that the lead portions can be distorted with shrinkage of the corresponding linear members, the movable member and the drive rods are connected by inserting connecting pins formed in one of the movable member and the drive rods into oval connecting holes formed in the other of the movable member and the drive rods, the connecting holes and the connecting pins are engaged with each other in a moving direction of the drive rods when the linear members are tensed by contraction and extension thereof, and the connecting holes accept movement of the connecting pins in the moving direction of the drive rods when the linear members are loosened in a non-electrified state. 4. The operating device according to claim 1, wherein the cam further comprises convex portions respectively formed on the one-side active surface and the other-side active surface, the convex portion for contacting with the cam following roller to prevent the movable member from rotating in a non-electrified state. 5. The operating device according to claim 4, wherein in the non-electrified state, initial tension acts in a contracting direction on the linear member not being switched from an electrified state to the non-electrified state, and F0>P0 is satisfied wherein P0 represents force acting on the movable member along a rotation direction thereof based on the initial tension and F0 represents force acting on the convex portions of the cam along a rotation direction of the movable member based on force F acting from the locking arm, and in the electrified state, T>F0 is satisfied wherein T represents force acting on the movable member along a rotation direction thereof based on contractive force of the electrified linear member. 6. The operating device according to claim, wherein even when the linear member naturally contracts due to a high temperature in the non-electrified state of the linear member and the movable member rotates so that the cam following roller moves over a top of the convex portion of the cam from a first tilted surface on a base side of the convex portion, the cam following roller has a second tilted surface formed near a top of the cam on the convex portion so that urging force from the locking arm is larger than rotary force of the movable member on the second tilted surface. 7. The operating device according to claim 5, wherein even when the linear member naturally contracts due to a high temperature in the non-electrified state of the linear member and the movable member rotates so that the cam following roller moves over a top of the convex portion of the cam from a first tilted surface on a base side of the convex portion, the cam following roller has a second tilted surface formed near a top of the cam on the convex portion so that urging force from the locking arm is larger than rotary force of the movable member on the second tilted surface. 8. A position switching device including the operating device according to claim 1, comprising a lifter held by the fixing member to be swingable between an active position and an inactive position, wherein the movable member has a guide surface for urging the lifter in a swinging direction, releases the lifter in the inactive position at a rotation stop point in one direction of the movable member, and swings the lifter to the active position at a rotation stop point in the other direction of the movable member, and the lifter is switched to the active position and the inactive position by the repeated operation of the movable member around the pivot shaft. 9. A magneto-optical recording/reproducing apparatus, comprising: the position switching device according to claim 7; and a magnetic head provided to be swingable between a position at which the magnetic head slidingly contact with an optical disc and a position at which the magnetic head separates from the optical disc, wherein the position switching device has a lifter for holding, in an active position, the magnetic head at the position at which the magnetic head separates from the optical disc, and releasing, in an inactive position, the magnetic head at the position at which the magnetic head slidingly contacts with the optical disc, and a magnetic head placed so as to swing to and from a position making sliding contact with an optical disc and a position separated from the optical disc, wherein the position switching device has a lifter for holding, on an active position, the magnetic head on the position separated from the optical disc and releasing, on an inactive position, the magnetic head to the position making sliding contact with the optical disc.
Nicklos Carl F. ; Thayne Mark S. ; Jones David E. ; Sonderegger Ralph L. ; Moody Reed J., Disk drive apparatus having an improved spindle motor loading mechanism.
Cho Dong-Il (Dept. of Control & Instrumentation Engineering Seoul National University Kwanaku-ku ; Shinlim-dong San 56-1 Seoul 151-742 KRX), Shape memory alloy relays and switches.
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