Olympus Optical Company, Ltd.

Yoshihiro Matsumoto

Masashi Hankawa

Fumio Tomikawa

Tetsuhisa Asai

A binocular telescope provided with a pair of left and right lens-barrels respectively containing optical systems, a first guide shaft for supporting these lens-barrels in such a manner that the lens-barrels can slide in a direction perpendicular to the optical axes of the optical systems and can rotate, a second guide shaft for restraining the relative tilt of the lens-barrels around this first guide shaft in such a manner that the optical axes of the left and right optical systems become parallel to each other, a first rib for holding both ends of the first guide shaft by fitting upper and lower covers to each other, and a second rib for restraining the tilt of the optical axes of the entire lens-barrels around the first guide shaft.

Binocular telescope

A prism optical system provided with: a first prism on which a light ray coming from an objective lens is incident; a second prism on which the light ray coming from this first prism is incident, and from which this incident light ray is emitted; and a plate-like member which is interposed between the aforesaid prisms so as to provide a predetermined air space therebetween and which has a diaphragm opening and a light blocking portion. Further, an uneven portion, which consists of depressions and projections and has a serrate section, for preventing light rays, which have been reflected from the surface of the light blocking portion of this plate-like member, from entering a field stop is provided in the light blocking portion thereof. Thereby, occurrences of ghosts and flares due to stray light are prevented. Moreover, ghosts and flares are reduced.

Optical system having compound prism design to reduce ghosts and plares

An interpupillary distance adjusting mechanism for use in a binocular telescope, having a pair of lens-barrels which contain lens optical systems, respectively, and are placed in parallel with each other. The interpupillary distance adjusting mechanism further has first and second guide shafts, which slidably guide the pair of lens-barrels in a direction substantially perpendicular to the direction of the optical axes of the lens optical systems, interpupillary distance adjusting springs for pushing the pair of lens-barrels in a sliding direction, and an interpupillary distance adjusting cam which can adjust an interpupillary distance by sliding the pair of lens-barrels along the guide shafts as the result of undergoing a pushing force from the interpupillary distance adjusting spring, of converting a part of the pushing force in a direction which intersects the sliding direction, and of moving the pair of lens-barrels by pushing the pair of lens-barrels against the first guide.

Growing community of inventors

Inagi, Japan

Yoshihiro Matsumoto