阅读说明：本技术 加热器以及图像形成装置 (Heater and image forming apparatus ) 是由 加藤聡子 木村健太郎 于 2019-08-27 设计创作，主要内容包括：本发明提供一种照顾到环境的加热器以及图像形成装置。加热器包含基板、电阻发热体、热敏电阻。基板具有第一面及位于与第一面相反侧的第二面。电阻发热体配置在第一面。热敏电阻配置在第二面,且不含有铅。(The invention provides a heater and an image forming apparatus which take care of the environment. The heater comprises a substrate, a resistance heating element and a thermistor. The substrate has a first surface and a second surface located on the opposite side of the first surface. The resistance heating element is disposed on the first surface. The thermistor is disposed on the second surface and does not contain lead.)

1. A heater, comprising:

a substrate having a first surface and a second surface located on the opposite side of the first surface;

a resistance heating element disposed on the first surface; and

and a thermistor disposed on the second surface and containing no lead.

2. The heater of claim 1, wherein

The thermistor contains manganese, cobalt, and one or both of copper and nickel.

3. The heater of claim 2, wherein

The mass content of one or both of manganese, cobalt, copper and nickel of the thermistor is increased to decreased in this order.

4. The heater of claim 2, wherein

The thermistor has a mass content ratio of manganese and cobalt that is greater than a mass content ratio of the other components.

5. The heater of claim 2, wherein

The total mass content of the manganese, the cobalt, the copper, and the nickel in the thermistor is 50 to 70[ mass% ].

6. A heater according to claim 3, wherein

The total mass content of the manganese, the cobalt, the copper, and the nickel in the thermistor is 50 to 70[ mass% ].

7. The heater of claim 4, wherein

The total mass content of the manganese, the cobalt, the copper, and the nickel in the thermistor is 50 to 70[ mass% ].

8. A heater according to any one of claims 1 to 5 wherein

The thermistor contains ruthenium of 2 to 15 mass%.

9. An image forming apparatus includes:

the heater of claim 1, heating a medium; and

a pressing roller that presses the medium heated by the heater,

the toner image adhering to the medium is fixed by the heater and the pressure roller.

Technical Field

Embodiments of the present invention relate to a heater (heater) and an image forming apparatus.

Background

For example, a heater is known which is used for toner fixing in a copying machine, a facsimile machine, or the like, print erasing in a rewritable card reader (rewritable reader), or the like. The heater generates heat from a resistance heating element formed on one surface of the substrate by electric power supplied from the power supply electrode. A thermistor (thermistor) is disposed on the other surface of the substrate. The supply of electric power is controlled based on the temperature detected by the thermistor, thereby adjusting the heater to an appropriate temperature.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open No. 2003-240647

Disclosure of Invention

[ problems to be solved by the invention ]

In such a heater, lead is contained as a component constituting the thermistor, and therefore, the design of the thermistor is required in consideration of the environment.

An object of the present invention is to provide a heater and an image forming apparatus that take care of the environment.

[ means for solving problems ]

Drawings

Fig. 1 is a plan view showing a heater according to an embodiment from a first surface side of a substrate.

Fig. 2 is a plan view showing the heater of the embodiment from the second surface side of the substrate.

Fig. 3 is a graph showing the results of a peeling test of the thermistor.

FIG. 4 is a graph showing the relationship between the ruthenium content [ mass% ] in the thermistor and the sheet resistance [ kg/□ ].

Fig. 5 is a sectional view showing a fixing device of an embodiment using a heater of the embodiment.

Fig. 6 is a sectional view showing an image forming apparatus of an embodiment using a heater of the embodiment.

[ description of symbols ]

1: heating device

11: substrate

12: resistance heating body

13: first conductor

14: electrode for power supply

15. 18: coating layer

16: thermal resistor

17: second conductor

The heater of the embodiment includes a substrate, a resistance heating element, and a thermistor. The substrate has a first surface and a second surface located on the opposite side of the first surface. The resistance heating element is disposed on the first surface. The thermistor is disposed on the second surface and does not contain lead.

In the heater, the thermistor contains manganese, cobalt, and one or both of copper and nickel. And, the mass content of one or both of manganese, cobalt, copper and nickel of the thermistor is in this order from large to small. The thermistor has a mass content ratio of manganese and cobalt that is greater than a mass content ratio of the other components. The total mass content of manganese, cobalt, copper, and nickel in the thermistor is 50 to 70 mass%. The thermistor contains ruthenium in a range of 2 to 15 mass%.

An image forming apparatus according to another embodiment includes the heater that heats a medium, and a pressure roller that presses the medium heated by the heater, and fixes a toner image adhering to the medium by the heater and the pressure roller.

[ Effect of the invention ]

According to the present invention, a heater and an image forming apparatus that take care of the environment can be provided.