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US 5,691,965 AGranted
Actuator comprising a rotatable magnet body; actuator unit comprising the actuator and a control system; magneto-optical device comprising the actuator, and scanner comprising the actuator
AssigneeU.S. Philips Corporation
InventorsGerardus L. M. Jansen, Antonius T. A. Peijnenburg
Life of this patent
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Abstract
An actuator comprises a permanent magnet body (1) and coil means for cooperation with the magnet body. The magnet body is rotatable about an axis of rotation (7) between, for example two, stop positions. The coil means exclusively comprise at least one active coil section (9a, 11a) of an electrical coil, which coil section extends parallel to the axis of rotation of the magnet body and substantially faces a magnet pole in a stop position of the magnet body.
Claims9
A actuator unit comprising:
- a) a permanent magnet body which is rotatable between stop positions about an axis of rotation, the magnet body having at least two magnet poles situated diametrically at opposite sides of the axis of rotation;
- b) coil means for cooperation with the magnet body to move said body from one stop position to another stop position, the coil means exclusively comprised of two active coil sections extending substantially parallel to the axis of rotation of the magnet body and substantially facing one and the same of said magnet poles in the stop positions of the magnet body;
- c) ferromagnetic element means substantially facing one of the magnet poles in the stop positions of the magnet body;
- and
- d) a control system, which control system comprises two Hall sensors, the Hall sensors of the control system, in the stop positions of the magnet body, being disposed at opposite sides of a plane which is oriented transversely of the magnet poles and passes through the axis of rotation, the control system having a matrix unit having a first input and a second input for signals issuing from the Hall sensors.
2 more elements
A scanner comprising:
- a) a radiation source;
- and
- b) an actuator unit comprising:
- i) a permanent magnet body which is rotatable between stop positions about an axis of rotation and which has magnet poles situated diametrically at opposite sides of the axis of rotation;
- ii) coil means for cooperation with the magnet body to move said body from one stop position to another stop position, wherein the coil means is exclusively comprised of two active coil sections, the coil sections extending substantially parallel to the axis of rotation of the magnet body and substantially facing one of the magnet poles in the stop positions of the magnet body;
- and
- iii) a lateral reflecting surface adjacent the magnet body, the surface extending parallel to the axis of rotation of the magnet body, the surface positionable for reflecting a radiation beam issuing from the radiation source.
4 more elements
Dependencies are inferred from the claim text.