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:
Mar. 24, 2020
Filed:
Jul. 20, 2018
Varian Semiconductor Equipment Associates, Inc., Gloucester, MA (US);
Paul E. Pergande, Austin, TX (US);
Varian Semiconductor Equipment Associates, Inc., Gloucester, MA (US);
Abstract
A system and method for heating silicon carbide substrates is disclosed. The system includes a heating element that utilizes LEDs that emit light at wavelengths between 600 nm and 650 nm. This wavelength is better absorbed by silicon carbide. In certain embodiments, collimating optics are disposed between the LEDs and the silicon carbide substrate. The collimating optics may increase the allowable distance between the LEDs and the substrate. In other embodiments, a diffuser is disposed between the LEDs and the substrate. In addition, a method of heating a substrate is disclosed. The relationship between absorption coefficient and wavelength is determined for the substrate. Based on this relationship, an optimal wavelength or range of wavelengths is selected. The substrate is then heated using an LED emitting light at the optimal wavelengths.