| 摘要 |
PROBLEM TO BE SOLVED: To provide a pinhole detector capable of accurately detecting pinholes. SOLUTION: An optical fiber bundle 3 comprises a fiber group 31 including optical fibers 3a-3f, a fiber group 32 including optical fibers 3g-3m, and a fiber group 33 including optical fibers 3n-3s. One end face sides of the fiber groups 31, 32, 33 are arrayed linearly, to be attached to a light-receiving member 2. The other end face sides of the fiber groups 31, 32, 33 are bundled to form a bundled state into a circle 34. The plurality of optical fibers included in the respective fiber groups 31, 32, 33 are bundled regularly to disperse positions of the plurality of optical fibers, without being one-sided intensively within the circle 34, in the other end face sides of the fiber groups 31, 32, 33, i.e. the attaching side of a Frensnel lens. COPYRIGHT: (C)2007,JPO&INPIT
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