Patent ID: 11914119
Assignee: KONICA MINOLTA, INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A light distribution measuring apparatus comprising an ultraviolet optical system and a sensor that converts an optical image formed on a light receiving sensor surface into an electrical signal,
wherein the ultraviolet optical system comprises:
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,

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,
the light distribution measuring apparatus outputs light distribution of the ultraviolet light source by using the signal obtained by the sensor, and
the ultraviolet optical system is positioned such that the intermediate image is re-imaged on the light receiving sensor surface, and the sensor has light receiving sensitivity to ultraviolet light having a wavelength of 300 nm or shorter.