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:
Dec. 11, 2012
Filed:
Jan. 28, 2010
Minoru Maehara, Matsubara, JP;
Kazuyoshi Kadotani, Hirakata, JP;
Kenichiro Tanaka, Neyagawa, JP;
Ichirou Tanimura, Shijounawate, JP;
Takuya Nobuta, Ikoma, JP;
Minoru Maehara, Matsubara, JP;
Kazuyoshi Kadotani, Hirakata, JP;
Kenichiro Tanaka, Neyagawa, JP;
Ichirou Tanimura, Shijounawate, JP;
Takuya Nobuta, Ikoma, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An illumination device is provided for controlling a color temperature of light irradiated from a light source having a plurality of light-emitting elements of different light colors. A control setting module provides a control signal associated with a desired color temperature for the irradiated light. A light quantity determination circuit determines light quantities for each of the light-emitting elements based on a relationship between the control signal from the control setting module and an inverse color temperature. A plurality of driver circuits provide driver signals to the light-emitting elements corresponding to the determined light quantities. In this manner the color temperature for light irradiated from the light source coincides with the desired color temperature.