US 11,914,119 B2
Ultraviolet optical system and light distribution measuring apparatus
Yusuke Hirao, Takatsuki (JP); and Takashi Kawasaki, Sakai (JP)
Assigned to KONICA MINOLTA, INC., Tokyo (JP)
Appl. No. 17/613,344
Filed by Konica Minolta, Inc., Tokyo (JP)
PCT Filed Feb. 3, 2020, PCT No. PCT/JP2020/003948
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2020/235145, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2019-096586 (JP), filed on May 23, 2019.
Prior Publication US 2022/0221697 A1, Jul. 14, 2022
Int. Cl. G02B 13/14 (2006.01); G01J 1/00 (2006.01); G01M 11/00 (2006.01); H04N 23/55 (2023.01)
CPC G02B 13/14 (2013.01) [G01J 1/00 (2013.01); G01M 11/00 (2013.01); H04N 23/55 (2023.01)] 12 Claims
OG exemplary drawing
 
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):

OG Complex Work Unit Math
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.