PURPOSE: To observe a direct image and a reflected image of an optical fiber simultaneously by single-time focusing by putting a transparent medium which is larger than air in refractive index and has a specific length along an optical path in the optical path.
CONSTITUTION: The direct image 10a when the abutting part of the optical fiber 10 is seen directly from above and the reflected image 10b when it is viewed horizontally through a mirror 14 are observed simultaneously through a microscope 11, and the transparent medium 20 which is larger in refractive index than air and has the specific length along the optical path is put in the optical path extending from the optical fiber 10 to an objective lens 12 through the mirror 14. Then, the optical path length from the optical fiber 10 directly to the objective lens 12 is equalized substantially to the optical path length from the optical fiber 10 to the objective 12 through the mirror 14, and the direct image 10 and reflected image 10b are observed simultaneously by putting in focus once.
WATANABE KOU
OOSATO KAZUKUNI
SUZUKI MASAO
IMON KENGO
MATSUMOTO MICHITO
NIPPON TELEGRAPH & TELEPHONE
| JP59101213B |
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