Panasonic Corporation

Kaoru Ibara

Takashi Saito

Naohiro Toda

Hiroki Noguchi

Ayako Tsukitani

Kensuke Yamazoe

Kouji Nishioka

Yoshinori Karasawa

Hiroe Kubo

Akira Takasima

In a photometry device, photopic vision luminance Lp is measured by a first luminance measuring unit including a first light filterand a first photoelectric converter, and scotopic vision luminance Ls is measured by a second luminance measuring unit including a second light filterand a second photoelectric converter. A calculation partcalculates mesopic vision luminance Lmes based on a measurement value (photopic vision luminance Lp) of the first luminance measuring unit and a ratio of a measurement value (scotopic vision luminance Ls) of the second luminance measuring unit to the measurement value (photopic vision luminance Lp) of the first luminance measuring unit. Consequently, the photometry device can improve measurement accuracy of the brightness (mesopic vision luminance) in mesopic vision.

Photometry device

Growing community of inventors

Osaka, Japan

Kaoru Ibara