US 11,809,108 B2
Image forming apparatus and image fixing method
Yohei Doi, Mishima Shizuoka (JP)
Assigned to Toshiba Tec Kabushiki Kaisha, Tokyo (JP)
Filed by TOSHIBA TEC KABUSHIKI KAISHA, Tokyo (JP)
Filed on Aug. 31, 2021, as Appl. No. 17/463,462.
Application 17/463,462 is a continuation of application No. 17/003,880, filed on Aug. 26, 2020, granted, now 11,150,582.
Claims priority of application No. 2019-228869 (JP), filed on Dec. 19, 2019.
Prior Publication US 2021/0389700 A1, Dec. 16, 2021
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/205 (2013.01) [G03G 15/2053 (2013.01); G03G 2215/00734 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An image forming apparatus, comprising:
a fixing device configured to fix an image to a sheet and including a first heating source and a second heating source, the second heating source having a heating width greater than a heating width of the first heating source, the first heating source and the second heating source being spaced from each other in a conveyance direction of the sheet through the fixing device, the second heating source having a heating output power that decreases with increases in temperature, the first heating source having a heating output power that decreases with increases in temperature less than the second heating source; and
a controller to select one of the first heating source or the second heating source in accordance with a size of a sheet to be supplied to the fixing device for fixing, wherein
if one of the first heating source and the second heating source fails, the controller is configured to select the other one of the first heating source and the second heating source irrespective of the size of the sheet.