| 摘要 |
PURPOSE:To easily make an eye width adjustment by allowing a turning part to turn when a rotating shaft is rotated by an operation member such as a knob outside a casing and then letting an arm contact and leave a couple of lens tubes according to said turn. CONSTITUTION:When the operation knob 14 is rotated, the turning shaft 13 and turning member 15 turns in the rotating direction of the knob. When the turning member 15 turns clockwise, nonturning member ends of the arms 16 and 17 move leaving each other and the lens tubes 3 and 4 are moved in leaving directions together with support plates 7 and 8 to widen the eye width. In this case, the lens tubes 3 and 4 turn on their optical axes to shift support shafts 9 and 10 down in position, so a coupling plate 11 and a pressure plate 12 move down along the turning shaft 13. When the turning member 15 turns counterclockwise, the lens tubes 3 and 4 move approaching to each other to narrow down the eye width. In this case, the coupling plate 11 and pressure plate 12 move up along the turning shaft 13. |
