Focusing mechanism for binoculars
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorGouzi Funathu
Life of this patent
Estimating the term…
Abstract
In binoculars employing a pair of telephotographic optical systems with their respective optical axes being arranged in parallel to each other, the telephotographic optical systems having a lens group for focusing, respectively, and at least one of the telephotographic optical systems having a lens group for diopter-adjusting; first shaft member for simultaneously moving each lens group for focusing in an optical axis direction; and second shaft member for moving the lens group for diopter-adjusting in the optical direction; wherein the first shaft member and the second shaft member are arranged coaxially. Thus, it becomes possible to adjust a diopter-difference and a difference of eye contact positions by means of a single mechanism and to easily adjust focusing with a simple arrangement.
Claims21
A binocular comprising:
- a pair of telephotographic optical systems with their respective optical axes being arranged in parallel to each other, each of said telephotographic optical systems has a lens group for focusing, and at least one of said lens groups being used for diopter-adjusting;
- first shaft means for simultaneously moving each said lens group for focusing in an optical axis direction, said first shaft means including a first operating member located at an end portion thereof;
- and
- second shaft means for moving said at least one of said lens groups for diopter-adjusting in said optical axis direction, said second shaft means including a second operating member located at an end portion thereof;
- wherein said first shaft means and said second shaft means are arranged coaxially, and said end portion of said first shaft means being located adjacent said end portion of said second shaft means;
- and
- said first shaft means being arranged to be movable by means of a focus adjustment screw arranged to be movable by means of one of said operation members, said one of said operation members being threaded with inner circumferential screw threads attached to the binocular, and a slidable member arranged to be slidable along an axis parallel to said optical axes for moving said pair of telephotographic optical systems when said one of said operation member is operated, whereby said pair of telephotographic optical systems are moved along said optical axes as said first shaft means is moved.
A binocular comprising:
- a pair of telephotographic optical systems with their respective optical axes being arranged in parallel to each other, each of said telephotographic optical systems has a lens group for focusing, and at least one of said lens groups being used for diopter-adjusting;
- first shaft means for simultaneously moving each said lens group for focusing in an optical axis direction;
- second shaft means for moving said at least one of said lens groups for diopter-adjusting in said optical axis direction;
- and
- wherein said first shaft means and said second shaft means are arranged concentrically, and said first shaft means includes an opening along an axis thereof, said second shaft means extending through said opening.
A binocular comprising:
- a pair of telephotographic optical systems with their respective optical axes being arranged in parallel to each other, each of said telephotographic optical systems has a lens group for focusing, and at least one of said lens groups being used for diopter-adjusting;
- first shaft means for simultaneously moving each said lens group for focusing in an optical axis direction;
- second shaft means for moving said at least one of said lens groups for diopter-adjusting in said optical axis direction;
- said first shaft means and said second shaft means being operated by respective operation members;
- and
- wherein said first shaft means and said second shaft means are arranged coaxially, and wherein said first shaft means is arranged to be movable by means of a focus adjustment screw arranged to be movable by means of one of said operation members, said one of said operation members being threaded with inner circumferential screw threads attached to the binocular, and a slidable member arranged to be slidable along an axis parallel to said optical axes for moving said pair of telephotographic optical systems when said one of said operation members is operated, whereby said pair of telephotographic optical systems are moved along said optical axes as said first shaft means is moved.
Dependencies are inferred from the claim text.