US 11,747,757 B2
Image forming apparatus
Yasuhiro Shimura, Yokohama (JP); Yusuke Saito, Susono (JP); and Ryota Ogura, Numazu (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 28, 2022, as Appl. No. 17/682,217.
Application 17/682,217 is a continuation of application No. 16/928,258, filed on Jul. 14, 2020, granted, now 11,294,310.
Application 16/928,258 is a continuation of application No. 16/680,926, filed on Nov. 12, 2019, granted, now 10,747,151, issued on Aug. 18, 2020.
Application 16/680,926 is a continuation of application No. PCT/JP2018/017376, filed on May 1, 2018.
Claims priority of application No. 2017-098262 (JP), filed on May 17, 2017; and application No. 2018-080851 (JP), filed on Apr. 19, 2018.
Prior Publication US 2022/0179341 A1, Jun. 9, 2022
Int. Cl. G03G 15/20 (2006.01); H05B 1/02 (2006.01); H05B 3/00 (2006.01); H05B 3/03 (2006.01); H05B 3/10 (2006.01)
CPC G03G 15/2039 (2013.01) [G03G 15/20 (2013.01); H05B 1/0241 (2013.01); H05B 3/00 (2013.01); H05B 3/03 (2013.01); H05B 3/10 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming portion for forming an image on a recording material; and
a fixing portion including
a tubular film and
a heater including a substrate, a heating element provided on the substrate, and a temperature sensing element provided on a surface of the substrate opposite to a surface on which the heating element is provided, wherein
the fixing portion fixes the image formed on the recording material to the recording material with heat from the heater which is controlled according to a sensed temperature by the temperature sensing element, wherein
the image forming apparatus includes a temperature sensing circuit to which the temperature sensing element is electrically connected,
a surface of the heater on a side where the temperature sensing element is provided is in contact with an inner surface of the film,
the heating element is provided in a primary side circuit which is electrically connected to a commercial power supply, and
between the primary side circuit and the temperature sensing circuit, basic insulation or reinforced insulation or double insulation in which additional insulation is added to the basic insulation is provided, and between a secondary side circuit which is reinforced insulated or double insulated with respect to the primary side circuit and the temperature sensing circuit, the basic insulation or the reinforced insulation or the double insulation is provided.