The present invention relates to an
optical fiber magnetic scanning arrangement for a miniature
optical fiber probe and can be applied for
optical beam delivery in various
optical imaging techniques. The arrangement is of the type where an
optical fiber is rigidly fixed to a current conductor and serving as a flexible
cantilever with a capability for the distal part of the optical
fiber of being deflected in a direction substantially orthogonal to its own axis. New designs of the magnetic
system are less critical to the shape and dimensional tolerances of
scanner elements and
assembly. These designs provide a potential for a less difficult
assembly process and for further
miniaturization. According to one aspect of the invention the permanent
magnet system includes at least a first permanent
magnet with a
magnetization direction that is substantially aligned with the own axis of the optical
fiber. The current conductor loop is placed adjacent to the one of the end faces of the first permanent
magnet. According to another aspect of the invention the permanent magnet
system includes at least a first permanent magnet piece with a
magnetization direction that is substantially orthogonal to the own axis of the optical
fiber. The permanent magnet piece extends in a direction substantially aligned with the own axis of the optical fiber and has an inner surface, the current conductor loop being adjacent to at least a part of the inner surface of the first permanent magnet piece. According to another aspect of the invention the permanent magnet system includes a permanent magnet of a
hollow cylinder type with a substantially radial
magnetization direction. The permanent magnet cylinder extends in a direction substantially aligned with the own axis of the optical fiber. The current conductor loop is placed inside the permanent magnet cylinder. A miniature
optical fiber probe, which incorporates the optical fiber lateral
scanner of the invention, will inherit all its benefits.