Patent ID: 7911691

Claim:
Binoculars including first and second lens barrels, a bridge for interconnecting said first and second lens barrels, and first and second optical systems accommodated in respectively said first and second lens barrels, said binoculars comprising: first and second focus lenses, included in respectively said first and second optical systems, and movable in an optical axis direction; an operation device, secured to said bridge, movable in said optical axis direction between a focus adjusting position and a diopter adjusting position, and rotatable in each of said focus adjusting position and said diopter adjusting position; a focus adjuster for moving said first and second focus lenses simultaneously in said optical axis direction for focus adjustment when said operation device is rotated in said focus adjusting position; and a diopter adjuster for moving said second focus lens in said optical axis direction for diopter adjustment when said operation device is rotated in said diopter adjusting position, wherein said operation device includes: a double barrel structure having a barrel body and a middle sleeve portion, said barrel body being operated externally for focus adjustment and diopter adjustment, said middle sleeve portion receiving insertion of a support shaft of said bridge in a rotatable and movable manner; a first gear, formed inside said barrel body, for transmitting rotation of said double barrel structure to said focus adjuster when said double barrel structure is set in said focus adjusting position; and a second gear, formed inside said barrel body, offset from said first gear with an interval, for transmitting rotation of said double barrel structure to said diopter adjuster when said double barrel structure is set in said diopter adjusting position.