LINEAR ACTUATOR
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United States of America Patent
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app pub date -
Apr 21, 2011
filing date -
Oct 22, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A linear actuator, wherein a permanent magnet is reliably prevented from being damaged. In a first linear actuator, the width of a gap between a first contact section and a second contact section in a radial direction or the width of a gap between the first contact section and the second contact section in a rotating direction is less than the width of a gap between a permanent magnet and a magnetic pole section. In a second linear actuator, a flat plate-like permanent magnet is provided in that one of a movable section and a stationary section which is provided with a coil for generating a magnetic flux for reciprocating the movable section, and that surface of the other which is opposed to the permanent magnet and functions as a magnetic pole surface is formed flat. In a third linear actuator, each of an engaging projection and a cutout is provided so as to be oriented in the direction in which the magnetic force of the permanent magnet acts on the magnetic pole section. At least a portion of the cutout is notched in the direction in which the magnetic force of the permanent magnet acts on the magnetic pole section.
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