| 摘要 |
A confocal optical system includes a pinhole aperture for creating a point light source from light that is transmitted through an optical fiber, an optical scanning system for scanning the light that emerges from the pinhole aperture, and an optical focusing system. The optical focusing system focuses light from the pinhole aperture via the optical scanning system onto or within an object such that the pinhole aperture and the focused light region at the object are at conjugate positions of the confocal optical system. Thus, light reflected by the object is returned to the optical fiber via the pinhole aperture. At least one of the optical scanning system and the optical focusing system includes a reflective surface region and a region that has a different reflectivity than the reflective surface region. The region that has a different reflectivity may be an aperture, a region of lower reflectance factor, or even a region that reflects light well, but in a direction which prevents light which does not illuminate the object via the optical scanning system from being returned to the optical fiber core region. Thus, the purpose of the region having a different reflectivity is to reduce optical noise that is returned to the optical fiber.
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