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Motor-driven focusing apparatus of a sighting telescope

  • US 6,269,580 B1
  • Filed: 10/14/1999
  • Issued: 08/07/2001
  • Est. Priority Date: 10/14/1998
  • Status: Expired due to Fees
First Claim
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1. A motor-driven focusing apparatus of a telescope, comprising:

  • a telescopic optical system which comprises a focusing lens group guided along an optical axis;

    a motor-driven lens moving device which drives said focusing lens group along the optical axis;

    a manual operating switch for actuating said motor-driven lens moving device; and

    a lens-control device for controlling said motor-driven lens moving device when said manual operating switch is turned ON, so that the moving amount per unit time of a focal point of said telescopic optical system, that is caused by a movement of said focusing lens group, is kept substantially at a constant speed regardless of the position of said focusing lens group on the optical axis, said constant speed being selected from one or more constant speeds.

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