US 11,841,656 B2
Image forming apparatus
Ryota Ogura, Numazu (JP); and Yasuhiro Shimura, Yokohama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by Canon Kabushiki Kaisha, Tokyo (JP)
Filed on Sep. 20, 2021, as Appl. No. 17/479,187.
Application 17/479,187 is a continuation of application No. 16/843,269, filed on Apr. 8, 2020, granted, now 11,156,946.
Application 16/843,269 is a continuation of application No. 16/451,711, filed on Jun. 25, 2019, granted, now 10,649,377, issued on May 12, 2020.
Application 16/451,711 is a continuation of application No. PCT/JP2017/046105, filed on Dec. 22, 2017.
Claims priority of application No. 2016-251541 (JP), filed on Dec. 26, 2016.
Prior Publication US 2022/0004131 A1, Jan. 6, 2022
Int. Cl. G03G 15/20 (2006.01); G03G 15/00 (2006.01); H05B 3/00 (2006.01)
CPC G03G 15/2053 (2013.01) [G03G 15/205 (2013.01); G03G 15/2042 (2013.01); G03G 15/5062 (2013.01); G03G 2215/2035 (2013.01); H05B 3/00 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a fixing portion that includes a heater having a substrate, a plurality of heating elements arranged on a first surface of the substrate along a longitudinal direction of the substrate, and a plurality of temperature detection elements arranged along the longitudinal direction of the substrate on a second surface of the substrate opposite to the first surface, and that heats an image formed on a recording material so as to fix the image on the recording material using heat from the heater; and
a power control portion that controls power to be supplied to the plurality of heating elements on the basis of temperature signals output by the temperature detection elements,
wherein
the plurality of temperature detection elements include:
a plurality of first temperature detection elements that are arranged at predetermined intervals in a longitudinal direction of the substrate and respectively output temperature signals individually; and
a plurality of second temperature detection elements that are arranged at predetermined intervals in positions that differ from the positions of the first temperature detection elements in a lateral direction that is orthogonal to the longitudinal direction but correspond to the positions of at least some of the plurality of first temperature detection elements in the longitudinal direction, and that output a single temperature signal obtained by adding individual temperature signals together,
each of the first temperature detection elements is respectively provided at a position corresponding to each of the plurality of heating elements in the longitudinal direction of the substrate,
each of the second temperature detection elements is respectively provided at a position corresponding to each of the plurality of heating elements in the longitudinal direction of the substrate, and
the apparatus further comprises a temperature acquisition portion that acquires the individual temperature signals included in the single temperature signal on the basis of the plurality of temperature signals output by the plurality of first temperature detection elements and the single temperature signal.