| 摘要 |
The image forming apparatus includes: a reflection LED for emitting light to a surface of a recording medium on which an image is not yet fixed; a transmission LED for emitting light to the back face of the surface of a recording medium on which an image is not yet fixed; a CMOS area sensor for reading, as image, a light irradiation region of the recording medium by the reflection LED or the transmission LED to output the image; and a condition setting mechanism for providing a control by which, in accordance with an output value from the CMOS sensor, a fixing processing condition of a fixing apparatus is set. The image forming apparatus transforms a waveform of the output from the CMOS area sensor to a frequency component to determine, based on the feature quantity of the frequency component, the type of the recording medium.
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