Fixing device and image forming apparatus using the same

A fixing device comprising:

• a first irradiation unit that irradiates a laser beam in a first irradiation region toward a recording medium in which unfixed image is formed on both sides thereof using an image forming material capable of being heated and fixed;
• a second irradiation unit that irradiates a laser beam toward a second irradiation region disposed in rear side of the first irradiation region of the recording medium;
• an image information acquiring unit that acquires image information of the first irradiation region and image information of the second irradiation region;
• a coating information acquiring unit that divides the first irradiation region and the second irradiation region into one or a plurality of divided regions, acquires coating information that relates to the coating level by the image forming material within the divided region on the basis of the image information acquired by the image information acquiring unit, and determines quantity of the coating information in the first irradiation region and the second irradiation region;
• a transmission information acquiring unit that acquires transmission information that relates to the laser beam which is irradiated from the first irradiation unit or second irradiation unit to the irradiation region and passes through the recording medium on the basis of the coating information acquired by the coating information acquiring unit regarding the first irradiation region or the second irradiation region whichever is determined to have smaller coating information;
• an irradiation control unit that sets the irradiation energy to a value obtained by subtracting the irradiation energy based on the transmission information from a predetermined irradiation energy level regarding the first irradiation region or the second irradiation region whichever is determined to have larger coating information.