公开(公告)号：EP3612000A1

公开(公告)日：2020-02-19

申请号：EP18785237.1

申请日：2018-04-03

Applicant: NHK Spring Co., Ltd.

Inventor： HANAMACHI, Toshihiko ,  SEKIYA, Kenji ,  TAKAHARA, Go ,  AIKAWA, Naoya ,  KISARA, Yuta ,  TATSUMI, Arata

IPC: H05B3/72 ,  H05B3/20 ,  H05B3/30 ,  H05B3/48

Abstract: A heater unit including a small diameter sheath heater with improved reliability is provided. The heater unit includes a first substrate and a second substrate joined together, a groove arranged on at least one join surface of the first substrate and the second substrate, and a sheath heater arranged inside the groove. The sheath heater includes a metal sheath, a heating wire having a band shape, the heating wire arranged with a space within the metal sheath so as to rotate with respect to an axis direction of the metal sheath, an insulating material arranged in the space, and connection terminals arranged at one end of the metal sheath, connection terminals electrically connected with both ends of the heating wire respectively.