Asahi Kogaku Kogyo Kabushiki Kaisha

Yasuhiro Nishikata

Tetsuya Abe

Moriyasu Kanai

Tetsuo Sekiguchi

A converter for a polar-axis telescope includes an optical system which varies one of the field of view, angle of field, and magnification of the polar-axis telescope. A movable lens barrel is provided which holds the optical system such that the optical system can be moved into or out of the optical path of the polar-axis telescope. The converter may be detachably attached to a front end of the polar-axis telescope, or may be built into the polar-axis telescope. The converter lens system has a negative power and includes a negative lens group and a positive lens group.

Converter for polar-axis telescope

A wedge prism unit is positioned on the optical axes of the objective optical systems of two telescope systems of a binocular. The wedge prism unit includes a front wedge prism element and a rear wedge prism element that are oppositely oriented. When rotated by equal amounts in opposite directions, the wedge prism elements deflect incident light in a direction perpendicular to the rotation axis. The wedge prism unit is placed along the objective optical axes of the binocular, oriented to deflect the visual field to compensate for vibration. A control circuit controls a single motor according to a vibration sensor to deflect the visual field in a direction opposite to the vibration. The rotation axis is either within or outside of an imaginary plane containing both of the optical axes.

Growing community of inventors

Tokyo, Japan

Yasuhiro Nishikata