Motor-driven focusing apparatus of a sighting telescope
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorShinichi Suzuki
Life of this patent
Estimating the term…
Abstract
A motor-driven focusing apparatus of a telescope, includes a telescopic optical system which includes a focusing lens group guided along an optical axis; a motor-driven lens moving device which drives the focusing lens group along the optical axis; a manual operating switch for actuating the motor-driven lens moving device; and a lens-control device for controlling the motor-driven lens moving device when the manual operating switch is turned ON, so that the moving amount per unit time of a focal point of the telescopic optical system, that is caused by a movement of the focusing lens group, is kept substantially at a constant speed regardless of the position of the focusing lens group on the optical axis, the constant speed being selected from one or more constant speeds.
Claims12
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.
A sighting telescope incorporated in a surveying instrument, comprising:
- a telescopic optical system which comprises a focusing lens group guided along an optical axis;
- an autofocusing system which starts moving said focusing lens group along said optical axis to bring a sighting object into focus upon an AF start switch being turned ON;
- a motor-driven auxiliary focusing apparatus that moves said focusing lens group along said optical axis to finely adjust the position of said focusing lens group on said optical axis, said motor-driven auxiliary focusing apparatus comprising an manual operating switch that is operated to actuate said motor-driven auxiliary focusing apparatus;
- and
- a lens-control device for controlling said motor-driven auxiliary focusing apparatus, 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.
Dependencies are inferred from the claim text.