Patent ID: 9639047
Date: 2017-05-02
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image forming device configured to form a pattern image, in which unit images are arranged, on a photosensitive member; a sensor to irradiate the pattern image with light and to detect reflected light; and a controller to control the image forming device to form a pattern image for printing and a pattern image for detection on the photosensitive member, the pattern image for printing being a pattern image to be used when printing, and the pattern image for detection being a pattern image to be detected by the sensor, wherein a first pattern image for printing comprises a predetermined number of first unit images, the first unit images being arranged to be spaced from each other per a predetermined area, each of the first unit images being smaller than a predetermined size, and wherein a first pattern image for detection, which directly corresponds to the first pattern image for printing, comprises a predetermined number of the first unit images greater than the predetermined number of the first unit images of the first pattern image for printing, the first unit images being arranged to be spaced from each other per the predetermined area.