Heater, heating device, and image forming apparatus
A heater includes: a substrate; an insulating layer that is provided on the substrate; and a heat generating element that is provided on the insulating layer, and in a case where a region including a center of the substrate is defined as a first region, a region on a side closer to one end portion than the first region is defined as a second region, and a region on a side closer to the other end portion than the first region is defined as a third region in a transverse direction that is orthogonal to a longitudinal direction of a surface of the substrate on which the insulating layer is provided, the first region is a plane, and the second region and the third region are bent from the first region in a thickness direction of the substrate that is orthogonal to the longitudinal direction and the transverse direction.
1 . A heating device that heats a recording material with a nip portion,
the heating device comprising:
a tubular film that is rotatable;
a heater that is provided in an internal space of the film and heats the film;
a support member that holds the heater, comes into contact with an inner circumferential surface of the film, and guides rotation of the film; and
a rotating body that forms the nip portion between the rotating body and the film, wherein the heater includes:
an elongated plate-shaped substrate;
a heating generating element provided on the substrate;
a protective layer that covers the heat generating element;
an engaging portion that is formed by folding the substrate and is located in a sheet passing area in a width direction of the recording material that is orthogonal to a conveying direction of the recording material,
wherein the support member includes an engaged portion that is engaged with the engaging portion,
wherein a position of heater in the conveying direction with respect to the support member is determined by the engaging portion engaging the engaged portion, and
wherein the engaging portion and the engaged portion are located on a side further downstream than an inlet of the nip portion and on a side further upstream than an outlet of the nip portion in the conveying direction.
2 . The heating device according to claim 1 , further comprising:
a holding member that is located outside the sheet passing area and holds both end portions of the heater in the width direction such that relative movement of the heater with respect to the support member is restricted.
3 . The heating device according to claim 1 , wherein:
the engaging portion is a projecting portion,
the engaged portion is a recessed portion, and
the projecting portion projects in a direction that is orthogonal to the conveying direction such that the projecting portion overlaps the recessed portion as viewed in the conveying direction.
4 . The heating device according to claim 1 , wherein the engaging portion is provided at a center of the sheet passing area in the width direction.
5 . The heating device according to claim 1 , wherein a plurality of ones of the engaging portion are provided in the sheet passing area.
6 . The heating device according to claim 1 , further comprising a heat conducting member that comes into contact with an inner circumferential surface of the film and transmits heat of the heater to the film.
7 . The heating device according to claim 6 , wherein the heat conducting member is joined to the heater to cover the entire region of the heater in a transverse direction as viewed in a pressurizing direction that is orthogonal to the conveying direction and the width direction.
8 . The heating device according to claim 6 , wherein the engaging portion is provided at an end portion of the substrate on an upstream side in the conveying direction and extends away from the rotating body in a direction that is orthogonal to a surface of a conveyed recording material.
9 . The heating device according to claim 6 , wherein the heat conducting member is a thin and long plate member.
10 . The heating device according to claim 9 , wherein the substrate is made of metal.
11 . The heating device according to claim 1 , wherein the engaging portion extends toward the rotating body, in a direction that is orthogonal to a surface of a conveyed recording material.
12 . The heating device according to claim 1 , wherein the engaging portion is provided at an end portion of the substrate on an upstream side in the conveying direction and extends away from the rotating body in a direction that is orthogonal to a surface of the conveyed recording material.
13 . An image forming apparatus comprising:
an image forming portion that forms an image on a recording material; and
the heating device according to claim 1 that fixes, on the recording material, the image formed on the recording material.