| 摘要 |
Two secondary optical conductor rods are fitted through a radial bore in an optical conductor. A second conductor rod is fitted to the outer circumferential surface of the first conductor to cover the inserted section of one of secondary conductor rods. The opposite end of the latter has an inclined face separated from a correspondingly inclined face of another, movable, secondary conductor rod via a layer of optical oil. A gap between the two inclined surfaces is formed to the side of the second conductor rod, which has an optical axis nearer the light source than that of the first secondary conductor rod.
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