US 6,307,673 B1Granted

Focusing device of binocular

AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha

InventorsKen Hirunuma, Shinji Tsukamoto, Atsushi Denpo

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Abstract

A connecting member is provided with a first, a second and a third arm which radially extend. A first hole is formed at an end of the first arm, and a second hole is formed at an end of the second arm. The centers of the first and second holes respectively coincide with optical axes of objective lenses. A pair of eyepiece groups are held by a pair of holders. The holders are rotatably held by the first and second holes, so that an interpupillary adjustment is carried out. A rotation ring axle is threadably engaged with a third hole formed at an end of the third arm. A guide shaft passes through a junction of the first, second and third arms. The connecting member is movable along optical axes of the eyepieces, so that a focusing operation is carried out.

Claims10

Dependent claims

A focusing device for a biaxial type binocular, said biaxial type binocular comprising:

a pair of telescopic optical systems including a pair of objective optical systems and a pair of eyepieces;
and a supporting member which fixedly holds said pair of objective optical systems and rotatably supports a pair of eyepiece unit including a pair of eyepiece holding portions which hold said pair of eyepieces such that eyepiece optical axes of said pair of eyepiece optical systems are parallel to objective optical axes of said pair of objective optical systems and said pair of eyepieces are rotatable around said objective optical axes,
said focusing device comprising:
a connecting member that connects said pair of eyepiece holding portions;
and
a driving assembly that drives said connecting member in a direction parallel to said eyepiece optical axes.

3 more elements

Dependencies are inferred from the claim text.