Abstract: A binocular includes two parallel telescope systems. First and second lens units belong to one of the telescope systems, so that the optical axis of the first lens unit is in line with the optical axis of the second lens unit. The first and second lens units are supported by first and second movable frames, respectively, which are supported by a common guide shaft extending in the direction of the optical axes.

Abstract: A binocular includes two telescope systems with parallel axes, eyepiece frames having a concave surface facing a user, adjustable eye cups with a secure locking mechanism, operation controls placed between the telescope systems, a focus adjustment mechanism, a diopter correction mechanism, and a magnifying-power-varying mechanism. The magnifying-power-varying mechanism includes rotatable cam rings and guide rings connected by a single connecting belt that moves perpendicular to the optical axes to rotate the cam rings. The connecting belt is supported and held in position so that it does not bind. The position of magnifying-power-varying lenses can be adjusted. The positions of the guide rings with respect to the telescope systems can also be adjusted.

Abstract: A binocular includes two telescope systems. Each telescope system includes an objective system, an erecting system, and an eyepiece system. The binocular also includes a focus adjusting actuator and a focus adjusting knob, as well as a diopter correction actuator and a diopter correction knob. A guide member guides the focus adjusting actuator and the diopter correction actuator to be aligned along an optical axis of one of the telescope systems.

Abstract: A binocular includes two telescope systems with parallel axes, eyepiece frames, adjustable eye cups, operation controls positioned between the telescope systems, a focus adjustment mechanism, a diopter correction mechanism, and a magnifying-power-varying mechanism. The focus adjustment mechanism and diopter correction mechanism are arranged coaxially. The magnifying-power-varying mechanism includes rotatable cam rings and guide rings connected by a single connecting belt that moves perpendicular to the optical axes to rotate the cam rings. The connecting belt is supported and held in position so that it does not bind. The position of magnifying-power-varying lenses can be adjusted. During assembly, the magnifying-power-varying lenses can be mounted in the guide rings in a number of positions by rotating the lens frames holding the lenses about the optical axis and inserting sliders in linear guide grooves.

Abstract: A binocular including two telescope systems with parallel axes, eyepiece frames having a concave surface facing a user, adjustable eye cups with a secure locking mechanism, operation controls placed between the telescope systems, a focus adjustment mechanism, a diopter correction mechanism, and a magnifying-power-varying mechanism. The focus adjustment mechanism and diopter correction mechanism are arranged coaxially. The magnifying-power-varying mechanism includes rotatable cam rings and guide rings connected by a single connecting belt that moves perpendicular to the optical axes to rotate the cam rings. The connecting belt is supported and held in position so that it does not bind. The position of magnifying-power-varying lenses can be adjusted. During assembly, the magnifying-power-varying lenses can be mounted in the guide rings in a number of positions by rotating the lens frames holding the lenses about the optical axis and inserting sliders in linear guide grooves.

Abstract: A binocular includes two telescope systems with parallel axes, eyepiece frames, adjustable eye cups, operation controls placed between the telescope systems, a focus adjustment mechanism, a diopter correction mechanism, and a magnifying-power-varying mechanism. The magnifying-power-varying mechanism includes rotatable cam rings and guide rings connected by a single connecting belt that moves perpendicular to the optical axes to rotate the cam rings. The frame of the rearmost lens of each eyepiece optical system includes an end surface facing a user that has a predetermined concave curvature. An eye cup locking mechanism is provided that securely locks each eye cup to a respective barrel of the binocular.

Abstract: A binocular includes two parallel telescope systems. Each telescope system includes an objective system, an erecting system and an eyepiece system. The erecting system and the eyepiece system of each telescope system are part of a movable unit which is movable toward and away from a front-most lens of the objective system. The movable unit can be moved towards the front-most lens to a position in which an object cannot be viewed through the telescope system.

Abstract: A binocular includes two parallel telescope systems, two slide frames on which the telescope systems are respectively supported, and two shells, one fixed to each of the slide frames covering the telescope systems. The slide frames are supported by an I-shaped frame consisting of top and bottom members and a center block is provided between the top and bottom members. The slide frames between the top and bottom members so that the slide frames are slidable.

Abstract: A binocular incorporates a focusing and diopter correction mechanism having a common shaft, whereby the diopter adjustment is performed by rotation of the shaft and the focusing operation is performed by axial movement of the shaft. The lens-moving portions of the focusing/diopter adjustment mechanism are in a cavity having an access hole, in which the shaft enters the access hole through a water-tight seal to control the lens-moving portions of the adjustment mechanism. The binocular also incorporates a strap attaching mechanism having a spring-loaded clip and groove, wherein a flanged pin provided to a strap end is pushed past the clip into the groove, and the clip returns under the bias of the spring to hold the flanged pin in the groove. Also included is an eyecup adjustment mechanism having two positions defined by click-stops, wherein the eyecups are not rotatable, but are longitudinally slidable relative to corresponding support barrels.

Abstract: A binocular incorporates a focusing and diopter correction mechanism having a common shaft, whereby the diopter adjustment is performed by rotation of the shaft and the focusing operation is performed by axial movement of the shaft. The lens-moving portions of the focusing/diopter adjustment mechanism are in a cavity having an access hole, in which the shaft enters the access hole through a water-tight seal to control the lens-moving portions of the adjustment mechanism. The binocular also incorporates a strap attaching mechanism having a spring-loaded clip and groove, wherein a flanged pin provided to a strap end is pushed past the clip into the groove, and the clip returns under the bias of the spring to hold the flanged pin in the groove. Also included is an eyecup adjustment mechanism having two positions defined by click-stops, wherein the eyecups are not rotatable, but are longitudinally slidable relative to corresponding support barrels.

Abstract: Telescopic optical systems of a binocular have respective objectives movable along respective optical axes for focusing on an object, and respective power-varying lens assemblies movable along respective optical axes for varying magnifications. One of the objectives is manually movable independent of the other objectives for diopter difference adjustment. The binocular has a manually operable mechanism for actuating the power-varying lens assemblies to adjust the magnifications independently of each other, to equalize the magnifications regardless of angular movement of the telescopic optical systems about the optical axes of the objectives for interpupillary adjustment. Electric motors for moving the objectives into an in-focus condition and moving the power-varying lens assemblies to vary the magnifications synchronously, are disposed on one side of a plane interconnecting the optical axes of the objectives. Batteries for energizing the electric motors are disposed on the other side of the plane.

Abstract: Telescopic optical systems of a binocular have respective objectives movable along respective optical axes for focusing on an object, and respective power-varying lens assemblies movable along respective optical axes for varying magnifications. One of the objectives is manually movable independent of the other objectives for diopter difference adjustment. The binocular has a manually operable mechanism for actuating the power-varying lens assemblies to adjust the magnifications independently of each other, to equalize the magnifications regardless of angular movement of the telescopic optical systems about the optical axes of the objectives for interpupillary adjustment. Electric motors for moving the objectives into an in-focus condition and moving the power-varying lens assemblies to vary the magnifications synchronously, are disposed on one side of a plane interconnecting the optical axes of the objectives. Batteries for energizing the electric motors are disposed on the other side of the plane.