초록 ▼

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-d

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.

대표청구항 ▼

[ What is claimed is:] [1.]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

[ What is claimed is:] [1.]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; anda 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.