Ultraviolet optical system and light distribution measuring apparatus
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United States of America Patent
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Feb 27, 2024
Grant Date -
Jul 14, 2022
app pub date -
Feb 3, 2020
filing date -
May 23, 2019
priority date (Note) -
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status (Latency Note)
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Abstract
An ultraviolet optical system includes 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. A light distribution measuring apparatus includes the ultraviolet optical system and a sensor, and outputs light distribution of the ultraviolet light source by using a signal obtained by the sensor. The ultraviolet optical system is positioned such that the intermediate image is re-imaged on a light receiving sensor surface, and the sensor has light receiving sensitivity to ultraviolet light having a wavelength of 300 nm or shorter.
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