An image forming apparatus includes a first medium scanned with a first signal, a second medium scanned with a second signal, a rotary polygon mirror that deflects the first and second signals, a synchronization signal generation circuit that generates a synchronization signal representing a time to start scanning the first medium, and at least one pseudo synchronization signal generation circuit that generates a pseudo synchronization signal with the synchronization signal. The pseudo synchronization signal represents a time to start scanning the second medium. Based on a previously calculated period of the synchronization signal and a period of the synchronization signal counted on a particular surface of the polygon mirror, the pseudo synchronization signal generation circuit generates a particular value for generating the pseudo synchronization signal. Based on the particular value, the pseudo synchronization signal generation circuit starts generating the pseudo synchronization signal when the synchronization signal is enabled.

An image forming apparatus includes a first medium scanned with a first signal, a second medium scanned with a second signal, a rotary polygon mirror that deflects the first and second signals, a synchronization signal generation circuit that generates a synchronization signal representing a time to start scanning the first medium, and at least one pseudo synchronization signal generation circuit that generates a pseudo synchronization signal with the synchronization signal. The pseudo synchronization signal represents a time to start scanning the second medium. Based on a previously calculated period of the synchronization signal and a period of the synchronization signal counted on a particular surface of the polygon mirror, the pseudo synchronization signal generation circuit generates a particular value for generating the pseudo synchronization signal. Based on the particular value, the pseudo synchronization signal generation circuit starts generating the pseudo synchronization signal when the synchronization signal is enabled.

An example device including a laser source for generating a laser pulse, a scanner for mounting the laser source, and a motion detector for detecting a motion of the scanner when the laser pulse scans an object. The motion detector includes an optical sensor for generating an optical signal based on the motion of the scanner, and a controller. The controller determines a movement of the scanner and disables the laser source when the scanner ceases to move.

An example device including a laser source for generating a laser pulse, a scanner for mounting the laser source, and a motion detector for detecting a motion of the scanner when the laser pulse scans an object. The motion detector includes an optical sensor for generating an optical signal based on the motion of the scanner, and a controller. The controller determines a movement of the scanner and disables the laser source when the scanner ceases to move.

An image formation apparatus according to an embodiment may include: a sensor unit provided at a movable part being movable in a main scanning direction; a driver configured to move a medium in a sub-scanning direction; a controller that controls the sensor unit, the movable part, and the driver, wherein the controller controls the sensor unit to detect the medium while controlling the movable part to move in the main scanning direction without driving the driver, and controls the sensor unit to detect the medium while controlling the movable part to move in the main scanning direction with controlling the driver to move the medium in the sub-scanning direction.

An image formation apparatus according to an embodiment may include: a sensor unit provided at a movable part being movable in a main scanning direction; a driver configured to move a medium in a sub-scanning direction; a controller that controls the sensor unit, the movable part, and the driver, wherein the controller controls the sensor unit to detect the medium while controlling the movable part to move in the main scanning direction without driving the driver, and controls the sensor unit to detect the medium while controlling the movable part to move in the main scanning direction with controlling the driver to move the medium in the sub-scanning direction.

A device and a method for deflecting a beam of light. The device is developed together with: an adjustable deflection device; a closed-loop control unit, which is designed to generate an actuating signal by which the deflection device is controlled in a periodic movement for scanning a solid angle region with the aid of a beam of light deflected by the deflection device; and a detector device, which is designed to detect an impingement or a missing impingement of the scanning beam of light on the detector device, and to generate a measuring signal based thereon; the closed-loop control unit furthermore being designed to adapt the actuating signal based on at least the measuring signal.

A device and a method for deflecting a beam of light. The device is developed together with: an adjustable deflection device; a closed-loop control unit, which is designed to generate an actuating signal by which the deflection device is controlled in a periodic movement for scanning a solid angle region with the aid of a beam of light deflected by the deflection device; and a detector device, which is designed to detect an impingement or a missing impingement of the scanning beam of light on the detector device, and to generate a measuring signal based thereon; the closed-loop control unit furthermore being designed to adapt the actuating signal based on at least the measuring signal.

An image reading device includes at least one reference portion that is provided in a reading area of a reading unit provided with a moving mechanism, a memory unit that stores, as an initial value, positional data of the reference portion that is read by the reading unit, an acquisition unit that reads the positional data of the reference portion and acquires a displacement amount of the read positional data from the initial value, and an error handling unit that performs error handling when the displacement amount exceeds a predetermined value.

An image reading device includes at least one reference portion that is provided in a reading area of a reading unit provided with a moving mechanism, a memory unit that stores, as an initial value, positional data of the reference portion that is read by the reading unit, an acquisition unit that reads the positional data of the reference portion and acquires a displacement amount of the read positional data from the initial value, and an error handling unit that performs error handling when the displacement amount exceeds a predetermined value.