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:
Sep. 02, 1997
Filed:
Aug. 11, 1995
Yukio Akashi, Hirakata, JP;
Yoshinori Tanabe, Hirakata, JP;
Izumi Akashi, Hirakata, JP;
Kenji Mukai, Kobe, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A luminaire used in a room is provided with a brightness effect to avoid giving glare directly to people in the room, to give a desired illuminance on a working surface, and to give a high brightness sensation in the overall room. One or more sparkling regions are provided in which the luminance L (cd/m.sup.2) is in a range of 3.3.ltoreq.log L.ltoreq.-0.3 log w+2.63, when seen from any position in the room between a perpendicular angle of 60 degrees to less than 90 degrees, with the direction immediately beneath the center of the luminaire being 0 degrees. The apparent size of the sparkling region is the solid angle w (steradian (sr)).