| 摘要 |
A plurality of optical fibers each having a core of high refractive index light-transmitting material, a cladding of lower refractive index material and a number of longitudinal acid-soluble rods fused to the exterior of the cladding are formed into a bundle with the rods spacing the fibers apart and leaving voids between them. The bundle is elongated by drawing and the drawn bundle having voids between its fibers is potted at each end with an acid resistant material whereupon it is leached to remove lengths of the rods between the end coatings for producing a flexible image-transmitting conduit.
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