CPC G02B 13/14 (2013.01) [G01J 1/00 (2013.01); G01M 11/00 (2013.01); H04N 23/55 (2023.01)] | 12 Claims |
1. An ultraviolet optical system comprising:
an objective lens group that captures ultraviolet light for each angle from an ultraviolet light source and forms an intermediate image; and
an imaging lens group that re-images the intermediate image,
wherein neither the objective lens group nor the imaging lens group has a cemented surface, and all lenses included in the objective lens group and in the imaging lens group are single lenses that transmit ultraviolet light having a wavelength of 300 nm or shorter, and
the ultraviolet optical system satisfies a following conditional expression (1):
wherein
φ1 is an effective diameter of a lens surface positioned closest to an object side in an objective lens group, and
φ is a maximum effective diameter of lens surfaces in an entire system.
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