An upper cover attached to an optical box included in an optical scanning device includes a flow path in which a sealing member is injection-molded. The flow path includes a first bottom portion, a second bottom portion, and a step. The step is formed between the first bottom portion and the second bottom portion, and the area where the sealing member and the upper cover adhere to each other increases by an amount corresponding to the provided step so that adhesiveness between the sealing member and the upper cover is enhanced.

A lens-mirror array includes a second optical element arranged adjacent to a first optical element in a main-scan direction. The first optical element has an incident surface, a first reflection surface, and an exit surface. The incident surface is shaped to transmit and focus a light incident on the incident surface. The first reflection surface has positive optical power and is configured to reflect and focus the light entering through the incident surface. The exit surface outputs the light reflected by the first reflection surface. The second optical element includes a second reflection surface. A travel blocking portion is provided between the first reflection surface and the second reflection surface. A reflectance reduction layer is provided in the travel blocking portion to set light reflectance in the travel blocking portion to be lower than that of the first reflection surface.

To perform appropriate printing on a workpiece moving along a three-dimensional movement path. A laser marking apparatus includes: a laser light output section; a laser light scanning section; a print data generation section; a marking control section; and a print pattern correction section that corrects a print pattern received by an input interface based on movement path information related to a movement path of a workpiece moving with a change in a posture in a three-dimensional space. The print data generation section generates print data based on the print pattern corrected by the print pattern correction section.

A scanning optical apparatus is configured such that a first entrance surface that is an entrance surface of the first scanning lens is symmetrical in the main scanning direction, a first exit surface that is an exit surface of the first scanning lens is symmetrical in the main scanning direction, a second entrance surface that is an entrance surface of the second scanning lens is symmetrical in the main scanning direction, a second exit surface that is an exit surface of the second scanning lens is symmetrical in the main scanning direction, an optical axis of the second exit surface is shifted with respect to an optical axis of the second entrance surface in the main scanning direction, and an optical axis of the second exit surface is tilted around an axis that is perpendicular to both the main scanning direction and the optical axis of the second exit surface.

An image forming apparatus configured to scan laser light on a photoconductive body with a polygon mirror rotated by a polygon mirror motor includes a first determining unit, a second determining unit, and a storage unit. After the polygon mirror motor is started and shifts to steady rotation in a target rotating speed range, the first determining unit determines, repeatedly at a regular interval, whether rotating speed of the polygon mirror motor is within the target rotating speed range. If the rotating speed is outside the target rotating speed range a specified continuous number of times, the second determining unit determines that failure of the polygon mirror motor occurred. If the rotating speed returns from the outside to within the target rotating speed range a number of times less than the specified continuous number of times, the storage unit stores the number of times.

An image forming device includes a controller and a laser scanning unit. The laser scanning unit includes a light source for generating a laser beam for discharging a photoconductive member to create an electrostatic latent image. A first memory is housed on the laser scanning unit and stores data unique to the laser scanning unit and laser beam as characterized during production. A second memory in communication with the controller, and separate from the first memory, stores data characterizing a family of similar laser scanning units of a same type. The controller is configured to read both the first and second memories to generate data to compensate for energy variations along a scan path of the laser beam on the photoconductive member during use. The data substantially reduces energy variation from one scan path to a next.

An incidence angle of laser light with respect to a photosensitive member in a main-scanning direction is different depending on an exposure position. Hence, the spot shape of the laser light on the photosensitive member is different in the main-scanning direction. A filter coefficient is changed in the main-scanning direction, and image data is corrected with the filter coefficient.

An optical scanning device includes a light source unit, a polygonal mirror, a scanning lens, a casing, and a temperature sensor. The light source unit is configured to emit a laser beam. The polygonal mirror is configured to reflect the emitted laser beam from the light source unit by being rotated about a rotation axis extending in an upper-and-lower direction, whereby a peripheral surface of an image bearing member is scanned in a main scanning direction. The scanning lens is configured to form the laser beam reflected by the polygonal mirror into an image on the peripheral surface of the image bearing member. The casing is configured to house the light source unit, the polygonal mirror, and the scanning lens. The temperature sensor is configured to detect a temperature in the casing. The temperature sensor is configured to detect a temperature of the developing device.

An optical scanning device (11) in the image forming apparatus (1) of the present invention includes a deflector (35, 37) deflecting a laser light scanning an image carrier (13) outputted from a light source (32Y, 32C, 32M, 32K); a first reflection mirror part (43Y, 43C, 43M, 43K) adjusting scanning curve of the laser light deflected by the deflector (35, 37); and a second reflection mirror part (44Y, 44C, 44M, 44K) arranged at a downstream side from the first reflection mirror part (43Y, 43C, 43M, 43K) in an optical path of the laser light to adjust scanning inclination of the laser light.

An incidence angle of laser light with respect to a photosensitive member in a main-scanning direction is different depending on an exposure position. Hence, the spot shape of the laser light on the photosensitive member is different in the main-scanning direction. A filter coefficient is changed in the main-scanning direction, and image data is corrected with the filter coefficient.