The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2013
Filed:
Jul. 12, 2011
Takashi Saito, Hirakata, JP;
Hiroki Noguchi, Sanda, JP;
Naohiro Toda, Osaka, JP;
Ayako Tsukitani, Kyoto, JP;
Kouji Nishioka, Kurayoshi, JP;
Akira Takasima, Kobe, JP;
Kaoru Ibara, Osaka, JP;
Kensuke Yamazoe, Kadoma, JP;
Hiroe Kubo, Neyagawa, JP;
Yoshinori Karasawa, Minoh, JP;
Takashi Saito, Hirakata, JP;
Hiroki Noguchi, Sanda, JP;
Naohiro Toda, Osaka, JP;
Ayako Tsukitani, Kyoto, JP;
Kouji Nishioka, Kurayoshi, JP;
Akira Takasima, Kobe, JP;
Kaoru Ibara, Osaka, JP;
Kensuke Yamazoe, Kadoma, JP;
Hiroe Kubo, Neyagawa, JP;
Yoshinori Karasawa, Minoh, JP;
Panasonic Corporation, Osaka, JP;
Abstract
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.