Magnetically actuated endoscope coupler
An endoscopic coupler by which the rotary and/or linear motion of an external ring is transferred via magnetic interaction of specially configured continuous plastic magnets to a lens resident in a hermetically sealed housing to effect focusing and/or zooming action of the lens without mechanically breaching the integrity of the hermetic seal thereby making the coupler particularly suitable for withstanding the rigors of autoclaving.
1. An endoscopic coupler for relaying an image formed at the distal end of an endoscope to a detector located downstream of the coupler, said coupler comprising:
a hermetically sealed housing having transparent entrance and exit windows arranged along an optical axis;
a lens cell slidably mounted for translation in said hermetically sealed housing along said optical axis;
a lens mounted within said lens cell for receiving light through said entrance window and imaging it through said exit window and onto the detector;
a focusing ring mounted outside of said hermetically sealed housing for relative rotation with respect thereto;
a mechanical arrangement located within said hermetically sealed housing and adapted to translate said lens cell to move said lens along its axis;
a first continuous plastic cylindrical tubular magnet fixedly mounted to said focusing ring for movement therewith as said focusing ring is rotated, said first continuous plastic cylindrical tubular magnet comprising a plastic binder having magnetic powder distributed throughout and aligned as continuous magnetic poles that alter in polarity around the circumference of said first continuous plastic cylindrical tubular magnet but do not alter in polarity along its axial length; and
a second continuous plastic cylindrical tubular magnet mounted inside of said hermetically sealed housing for relative rotation with respect thereto, said second continuous plastic cylindrical tubular magnet also comprising a plastic binder having magnetic powder distributed throughout and aligned as continuous magnetic poles that alter in polarity around the circumference said second continuous plastic cylindrical tubular magnet but do not alter in polarity along its axial length, said second continuous plastic cylindrical tubular magnet being configured and arranged to rotate as said focusing ring is rotated and being coupled to said mechanical arrangement so that the rotary motion thereof causes said lens cell to translate along the axis of said lens to focus it.
2. The endoscopic coupler of claim 1 wherein both said first and second continuous plastic cylindrical tubular magnets have a magnetic pole arrangement such that relative rotation of one with respect to the other causes the other to rotate and relative translation of one with respect to the other causes the other to translate so that both focusing and zooming action may be effected.
3. The endoscopic coupler of claim 1 comprising at least two pairs of continuous plastic cylindrical tubular magnets such that relative rotation of one magnet of the first pair with respect to the other magnet of the first pair causes the other to rotate and move at least one element of said lens to effect focusing action and relative rotation of the second pair with respect to the other magnet of the second pair causes the other to rotate and move at least one other element of said lens to effect zooming action.
4. The endoscopic coupler of claim 1 wherein said lens comprises a reversed telephoto lens.
5. The endoscopic coupler of claim 4 wherein said reversed telephoto lens is configured to form high definition (HD) images on said detector.
6. The endoscopic coupler of claim 1 wherein said continuous plastic cylindrical tubular magnets are molded as thin walled hollow cylinders having an axial length substantially greater than their thickness.