(19)
(11) EP 4 339 709 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.05.2024 Bulletin 2024/22

(43) Date of publication A2:
20.03.2024 Bulletin 2024/12

(21) Application number: 23218622.1

(22) Date of filing: 21.12.2018
(51) International Patent Classification (IPC): 
G03G 15/20(2006.01)
(52) Cooperative Patent Classification (CPC):
G03G 15/2042; G03G 15/2053; G03G 2215/2019; G03G 2215/2035; G03G 21/00; H05B 1/0241
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 26.12.2017 JP 2017249230
19.12.2018 JP 2018237465

(62) Application number of the earlier application in accordance with Art. 76 EPC:
18215082.1 / 3570114

(71) Applicant: Ricoh Company, Ltd.
Tokyo 143-8555 (JP)

(72) Inventors:
  • ADACHI, Tomoya
    Tokyo, 143-8555 (JP)
  • FURUICHI, Yuusuke
    Tokyo, 143-8555 (JP)
  • SOMEYA, Yukimichi
    Tokyo, 143-8555 (JP)

(74) Representative: SSM Sandmair 
Patentanwälte Rechtsanwalt Partnerschaft mbB Joseph-Wild-Straße 20
81829 München
81829 München (DE)

   


(54) HEATING DEVICE, FIXING DEVICE, AND IMAGE FORMING APPARATUS


(57) A heating device (3000) includes a base (350), resistance heating elements (361 to 368), a power controller (450), a first temperature detector (TH1), a second temperature detector (TH2), a power interrupter (CO), and a controller (400). The resistance heating elements (361 to 368) are arranged in a longitudinal direction of the base (350) and electrically connected in parallel. The first detector (TH1) detects a temperature of a first resistance heating element (364). The second detector (TH2) detects a temperature of a second resistance heating element (368). The interrupter interrupts power to the elements when the temperature of the second element becomes a predetermined temperature or more. The controller controls the power controller such that a temperature of each element becomes a predetermined temperature, based on a result of detection of the first detector, and interrupts the power when the second detector detects predetermined temperature information regarding the second element.










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