Patent ID: 9417458
Filing Date: 2016-08-16
CPC Classification: G02B,H02K

Claim Text:
1. An image stabilizing device for a binocular telescope having a pair of telescopic optical systems which are installed in parallel in a binocular housing and each of which is made up of an objective lens, an erecting prism and an eyepiece lens coaxially arranged in this order, each said erecting prism being capable of rotating on horizontal first and vertical second axes of rotation which intersect at right angles in a plane perpendicular to an optical axis of said telescopic optical system so as thereby to compensate for deteriorations of a telescopic optical image caused due to external vibrations, said image stabilizing device comprising: gimbal structure for mounting thereon both of said erecting prisms, said gimbal structure comprising: an angular velocity detector for detecting an angular displacement of at least one of said internal gimbal frames; an external frame drive voice coil motor disposed between said gimbal casing and said external gimbal frame for rotating said external gimbal frame on said horizontal first axis of rotation; and an internal frame drive voice coil motor disposed between said external gimbal frame and each of said internal gimbal frames for rotating each of said internal gimbal frames on said vertical second axis of rotation; each of said external frame drive voice coil motor and said internal frame drive voice coil motors comprises a first yoke member having a permanent magnet mounted thereon and a second yoke member having a looped coil with an empty space therein and a position detection device disposed in said empty space of said looped coil for providing a position signal indicating a position of said looped coil relative to said permanent magnet.