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:
May. 23, 2006
Filed:
Apr. 01, 2003
Kazuo Iiduka, Yokohama, JP;
Toshiyuki Watanabe, Yokohama, JP;
Noriyuki Ikuta, Yokohama, JP;
Hisanobu Tanigawa, Sibuya-ku, JP;
Takatsuga Yuasa, Sibuya-ku, JP;
Kazuo Iiduka, Yokohama, JP;
Toshiyuki Watanabe, Yokohama, JP;
Noriyuki Ikuta, Yokohama, JP;
Hisanobu Tanigawa, Sibuya-ku, JP;
Takatsuga Yuasa, Sibuya-ku, JP;
Sumiden Opcom, Ltd., Tokyo, JP;
NTT Electronics Corporation, Tokyo, JP;
Abstract
In a temperature control device which maintains an object to be controlled at a preset constant temperature and an arrayed waveguide grating optical wavelength multiplexer/demultiplexer, the adverse effect of the junction temperature of the semiconductor control element is eliminated for the purpose of simplifying the overall structure and improving operation efficiency. The object to be controlled and semiconductor control element are fixed on the soaking plate. A negative feedback control is applied to the conduction condition of the semiconductor control element. Consequently, the junction temperature of the semiconductor control element is effectively used as a heating source not as a loss, thereby reducing the power consumption and stabilizing the performance.