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:
Apr. 24, 2007
Filed:
Feb. 28, 2005
Sundar Natarajan Yoganandan, 11700 Gelugor, Pulau Penang, MY;
Fakhrul Arifin Mohd. Afif, Permatang Pauh 13700 Prai, Pensang, MY;
Klan Shin Lee, S.P.U., Penang, MY;
Slew IT Pang, Bayan Lepas, 11900 Penang, MY;
Kheng Leng Tan, 11950 Penang, MY;
Yew Cheong Kuan, 11700 Penang, MY;
Su Lin Oon, 11900 Penang, MY;
Wen Ya Ou, 10470 Penang, MY;
Norfidathul Aizar Abdul Karim, Simpang Ampat 14120 Seberang Perai, MY;
Thye Linn Mok, 14000 Bukit Mertajam, Penang, MY;
Sundar Natarajan Yoganandan, 11700 Gelugor, Pulau Penang, MY;
Fakhrul Arifin Mohd. Afif, Permatang Pauh 13700 Prai, Pensang, MY;
Klan Shin Lee, S.P.U., Penang, MY;
Slew It Pang, Bayan Lepas, 11900 Penang, MY;
Kheng Leng Tan, 11950 Penang, MY;
Yew Cheong Kuan, 11700 Penang, MY;
Su Lin Oon, 11900 Penang, MY;
Wen Ya Ou, 10470 Penang, MY;
Norfidathul Aizar Abdul Karim, Simpang Ampat 14120 Seberang Perai, MY;
Thye Linn Mok, 14000 Bukit Mertajam, Penang, MY;
Other;
Abstract
A light source is disclosed. The light source has a light-emitting chip that includes an LED that generates light in an active region thereof. The LED emits a light signal in a forward direction, and infrared radiation generated in the active region is emitted in a side direction in the form of a first infrared signal. The first light signal is determined by a first drive signal coupled to the LED. The light source also includes an infrared detector positioned to collect a portion of the infrared signal. The infrared detector generates a heat signal indicative of the amount of infrared radiation detected. A controller generates the drive signal so as to maintain the heat signal at a first target value. In light sources having LEDs that emit in different spectral ranges, the infrared detectors can all detect heat in the same spectral range.