| 摘要 |
<p>This heater unit includes a power supply, which has a first terminal and a second terminal, a plurality of heaters, which are connected in series to the power supply, and a power supply position switching apparatus. The heater unit is characterized in that: among the heaters, a first heater connected to the first terminal of the power supply has a first terminal and a second terminal, and a second heater connected to the second terminal of the power supply has a third terminal and a fourth terminal; and the power supply position switching apparatus performs switching between a first state, wherein the first terminal of the power supply and the first terminal of the first heater are connected to each other, the second terminal of the power supply and the third terminal of the second heater are connected to each other, and the second terminal of the first heater and the fourth terminal of the second heater are connected to each other, and a second state, wherein the first terminal of the power supply and the second terminal of the first heater are connected to each other, the second terminal of the power supply and the fourth terminal of the second heater are connected to each other, and the first terminal of the first heater and the third terminal of the second heater are connected to each other.</p> |
