Provided is a liquid crystal compound having general physical properties necessary for a compound, stability to heat, light or the like, a wide liquid crystal phase temperature range, a high clearing point, an excellent compatibility with other liquid crystal compounds, a large refractive index anisotropy and a large dielectric anisotropy. During activation of the fixing device, a maximum power is supplied to the first heater, and only the first heater heats the fixing belt. In addition, a flag that represents whether the beginning of each decode unit is an angle switchable point is described.