| 摘要 |
An illumination apparatus includes a light guide fiber receiving illumination light, which is generated by first to third light sources, with first to third entrances and emitting at least part of the illumination light received by each entrance from a common exit. A second illumination relay optical system optically relays the illumination light from the second light source to form a first light beam having a first angle of incidence and sends the first light beam to the second entrance. First and third illumination relay optical systems optically relay the illumination light from the first and third light sources to form a second light beam having a second angle of incidence differing from the first angle of incidence and send the second light beam to the first and third entrances.
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