Constant force generator

A constant force generator, especially a tubular constant force generator, comprising:

• a stator which has a longitudinal axis and a permanently magnetic stator region, wherein the permanently magnetic stator region has a first longitudinal end and a second longitudinal end which is located axially opposite the first longitudinal end, and
• an armature which is arranged so as to be movable relative to the stator over a stroke in the direction of the longitudinal axis, which armature has a permanently magnetic armature region,
• wherein the permanently magnetic stator region and at least in part also the permanently magnetic armature region are each magnetized in a magnetization direction perpendicular to the direction of the longitudinal axis, and wherein the permanently magnetic stator region and the permanently magnetic armature region are arranged so as to be only partly overlapping in the direction of the longitudinal axis over the entire stroke of the armature, so that a magnetic force acting between the permanently magnetic stator region and the permanently magnetic armature region has a net force component in the direction of the longitudinal axis that is constant over the entire stroke,
• and
• wherein the permanently magnetic armature region has a first sub-region which has a magnetization having a net magnetization component in a direction opposite to the magnetization direction of the permanently magnetic stator region, so that in the case of an only partly overlapping arrangement of the first sub-region and the permanently magnetic stator region such that a longitudinal portion of the first sub-region protrudes from the permanently magnetic stator region in the direction of the longitudinal axis solely at the first longitudinal end of the permanently magnetic stator region, the net force component which is constant over the entire stroke comprises a repulsive constant net force component which repels the armature away from the first longitudinal end of the stator in the direction of the longitudinal axis.