Abstract: An optical probe and an optical imaging system include an optical guide, and an actuator having driving coils and a magnet. By supplying a driving current through the driving a magnetic flux is generated which causes a displacement of the distal end of the optical guide. A position measuring device includes a position measuring coil used for monitoring the position of the optical guide, where displacement of the guide distal end causes change in the relative positions of the measuring and driving coils. A power supply supplies a high frequency AC current through the driving coils which causes, an induced voltage in the position measuring coil and thus generates a magnetic coupling between the measuring and driving coils. This induced voltage change is indicative for the position of the distal end.

Abstract: This invention relates to an optical probe (200) and an optical imaging system, including an optical guide (201) having a proximal end and a distal end, an actuation means having driving coils (204) and a magnet, with of which being attached to the optical guide. By supplying a driving current through the driving coils a magnetic flux is generated which interacts with the magnet forming a driving force acting at on the optical guide causing a displacement of the distal end of the optical guide. A position measuring including a position measuring coil (205) is used for monitoring the position of the optical guide, where the internal arrangement of the position measuring coil and the driving coils is such that said displacement of the distal end of the optical guide causes a change in the internal arrangement.

Abstract: A system including a magnetic-tape cassette and a magnetic-tape apparatus for recording and/or reproducing information in digital form on/from a magnetic tape. The information is stored in a plurality of parallel longitudinal tracks on the magnetic tape in successive information blocks in the longitudinal direction of the magnetic tape. The tape apparatus includes an error correction device for correcting read errors in the digital information read from the magnetic tape. The error-correction device is capable of correcting a maximum number of n successive information blocks on the magnetic tape. The magnetic-tape cassette has at least one tape-cleaning element having an active surface in contact with a coating side of the magnetic tape and, in a direction parallel to the longitudinal axis of the magnetic tape, has a dimension smaller than the overall longitudinal dimension of two times n information blocks.