| 摘要 |
PROBLEM TO BE SOLVED: To provide a smoothness detector configured to compensate temporal reduction in output of detection means due to paper dust, and an image forming apparatus.SOLUTION: A smoothness detector includes: a sensor having a light source, and a photo detector which irradiates a recording medium with light emitted from the light source, to detect the quantity of light reflected by the recording medium; and a calculation section which calculates smoothness of the recording medium by means of a sensor output of the sensor. The calculation section includes a first memory which stores an initial value in the sensor output with respect to the recording medium, and a second memory which stores a ratio of reduction in sensor output per detection quantity which is set for the initial value. The calculation section calculates the amount of reduction in sensor output from the ratio of reduction in sensor output per detection quantity, according to the number of recording media detected, and adjusts the quantity of light emitted from the sensor on the basis of the calculation result, to calculate smoothness of the recording medium on the basis of the adjusted sensor output. |
