| 摘要 |
PROBLEM TO BE SOLVED: To make the propagatable distance of collimating beams longer relating to a collimator array and an optical device provided with this collimator array. SOLUTION: The collimator array is provided with an optical fiber array 6 with a plurality of optical fibers 2 arranged in parallel to each other, a lens array 10 having a plurality of lenses 8 facing the end surfaces of the plurality of the optical fibers and a means 12 for holding the optical fiber array and the lens array so as to separate these arrays at a predetermined distance. The collimator array is characterized in that the respective optical fibers have cores 14A expanding near their end surfaces. According to such configuration, there is no possibility of an increase in loss in spite of an increase in the distances between the lenses and the fiber end surfaces even when there is a restriction on the sizes of the lenses. Even more, the focal length of the lenses can be increased and therefore the propagation distance of the collimating beams can be made longer. COPYRIGHT: (C)2004,JPO
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