| 摘要 |
A binocular with a multiple-helicoid focus-adjusting mechanism, in which the internal helicoid is integrally mounted on an ocular-lens bridge member and in mesh with the external helicoid provided in the rear portion of a center shaft. The center shaft is coaxially supported in an objective-lens hinge member and integrally connected through the intermediary of a connecting pin to a knob, which is rotatably mounted on the hinge member. By the help of the multiple-helicoid mechanism, the ocular-lens bridge member is smoothly moved and steadily supported, and the most protrusible position of the ocular-lenses is easy to be adjusted without an addition such as a washer.
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