| 摘要 |
PURPOSE:To regulate a distance between mirrors and a rotary position of the mirrors by composing of a second mirror energized at a first mirror side, and a position regulating mechanism for regulating an axial position in contact with the second mirror support externally. CONSTITUTION:A pair of cylinders 11, 12 split axially and coupled relatively rotatably, a first mirror 23 mounted on the end of one cylinder 11, a second mirror 23 axially slidably supported to the end of the other cylinder 12 oppositely to the first mirror and energized to the first mirror side, and a position regulating mechanism 14 mounted on the cylinder mounted with the first mirror are provided for the construction. A rotating mechanism of the mechanism 14 is mounted with an annular worm wheel 27 having a large diameter larger than an end cylinder 16 at the other end of a rotary cylinder 18, a worm 28 engaged with the wheel 27 is supported to a supporting plate 29 formed at the lower end of the cylinder 16 to be operated by a handle. Thus, a distance between the mirrors and a relative rotary position of the mirrors can be regulated to be set to the most excellent characteristic state. |
