An optical scanning device includes a scanning optical system, a housing, a skew adjustment mechanism, and a control unit. The skew adjustment mechanism rotates a skew adjustment motor in a fixed direction, so as to periodically change position of an optical element. When rotating the skew adjustment motor by a rotation amount corresponding to a half period of position change of the optical element, average value of the position change of the optical element is substantially the same as average value of the position change of the optical element per one period. The control unit calculates rotation amount of the skew adjustment motor necessary for returning the optical element to the reference position, on the basis of rotation amounts of the skew adjustment motor at three points obtained by equally dividing the position change of the optical element per half period into two, and skew amounts.

A light scanning apparatus includes a deflecting unit deflecting a light flux from a light source to scan a scanned surface with light flux in a main scanning direction, and an optical system including a first optical element. The first optical element includes a transmissive surface transmitting a first light flux deflected by deflecting unit at a first timing to guide first light flux to scanned surface, and a reflective surface totally reflecting a second light flux deflected by deflecting unit at a second timing different from first timing to guide second light flux to a light receiving element. The reflective surface is arranged on the same side as light source with respect to a sub-scanning cross section including an optical axis of optical system, and the following inequality is satisfied:

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where ? represents an incident angle of a principal ray of second light flux to reflective surface.

The present disclosure is directed to suppressing image defects due to variations in the values of currents flowing through respective photosensitive drums during image formation, and reducing the absolute value of a voltage applied when a primary transfer power supply unit applies a voltage of polarity opposite to that during image formation, to primary transfer members. There is provided an image forming apparatus including a transfer member configured to make contact with an inner peripheral surface of a transfer belt, a first power supply unit configured to apply a voltage to the transfer member, a resistance element connected between the first power supply unit and the transfer member, and a diode connected in parallel with the resistance element in a direction in which a current flowing in a first direction is blocked and a current flowing in a second direction is passed.

Provided are a light scanning apparatus and an image forming apparatus including the same. The light scanning apparatus includes a housing, which includes a space therein; a light source module, which is installed at the housing and emits a light beam; a light deflector, which is installed on the bottom surface of the housing and deflects the light beam emitted by the light source module; an image forming optical system, which is installed in the space inside the housing and forms an image of the light beam deflected by the light deflector on a surface to be scanned; a flow restricting unit, which is arranged in the space inside the housing and restricts air flows formed as the light deflector is driven; and a cover, which covers the housing.

A supporting member supports an image reading device. The image reading device is movable between a first position at which a front side of the image reading device is close to an image forming unit and a second position at which a front side of the image reading device is spaced apart from the image forming unit. A first end portion of an operation unit protrudes outward of the image forming unit from one side surface. A second end portion of the operation unit that opposes the first end portion is positioned on an inner side of the image forming unit relative to one side surface of the image forming unit.

The present invention provides an inspection apparatus that compares a reference image with a printed material that has been printed to perform inspection of the printed material, and a method of controlling the same. The inspection apparatus exclusively controls, as an inspection mode of the inspection, an inspection mode between a mode for switching a discharge destination of a printed material in which a defect is recognized, and an inspection job of inspecting a printed material printed by a print job in which one copy includes a plurality of printed materials or an inspection type of inspecting printed materials having a sequential order.

The present invention provides an inspection apparatus that compares a reference image with a printed material that has been printed to perform inspection of the printed material, and a method of controlling the same. The inspection apparatus exclusively controls, as an inspection mode of the inspection, an inspection mode between a mode for switching a discharge destination of a printed material in which a defect is recognized, and an inspection job of inspecting a printed material printed by a print job in which one copy includes a plurality of printed materials or an inspection type of inspecting printed materials having a sequential order.