Patent ID: 8654174
Filing Date: 2014-02-18
Classification: G02B,G03G,H04N

Abstract:
1. An image forming apparatus comprising: a photoconductive drum; an exposure unit including a data processing circuit configured to convert input image data into a serial data signal having a frequency corresponding to a predetermined image formation magnification, a laser unit configured to operate according to the serial data signal converted by the data processing circuit and emit a laser beam for exposure and scanning for the photoconductive drum, and a rotary polygon mirror configured to reflect the laser beam, which is emitted from the laser unit, to the photoconductive drum, the exposure unit main-scanning the photoconductive drum along an axis direction of the photoconductive drum according to the rotation and the reflection of the polygon mirror, performing sub-scanning for repeating the main scanning according to the rotation of the photoconductive drum, and forming a latent image on the photoconductive drum according to the main scanning and the sub-scanning; a processing unit configured to develop the latent image formed on the photoconductive drum and transfer the developed image onto an image formation medium; a control panel for operation; a first control section configured to control, if an adjustment mode is set by operation of the control panel, the photoconductive drum, the exposure unit, and the processing unit to thereby form an image for test on the image formation medium; a second control section configured to finely adjust, if it is designated by operation of the control panel that the image for test formed on the image formation medium is defective, a number of revolutions of the polygon mirror by a predetermined rate and finely adjust the frequency of the serial data signal by the rate and, after the fine adjustment, cause the first control section to perform the formation of the image for test again; and a third control section configured to release the adjustment mode if it is designated by operation of the control panel that the image for test formed on the image formation medium is not defective.