An anamorphic optical element and an adjustment mechanism for selectively rotating the optical element either around an axis substantially in a vertical direction, an axis substantially in an optical axis direction, an axis substantially in a plane formed by the vertical direction and the optical axis direction, or combination of axes thereof is used to vary a vertical separation between two or more spots.

In a laser scanning device, a first light shielding portion and a second light shielding portion respectively shield a first light shielding region and a second light shielding region from a light beam. The first light shielding region is a part of a first region which is on one side of a target intermediate region and the second light shielding region is a part of a second region which is on the other side of the target intermediate region. The target intermediate region is a belt-like intermediate region of a light receiving surface of a light sensor. Widths of the first and second light shielding regions in the main scanning direction gradually expand from first and second base end portions to first and second side edges which are opposite ends of the light receiving surface in the sub scanning direction.

A laser scanning device includes a light source, a rotary polytope, a motor, a bearing, and a detection processing portion. The rotary polytope scans light emitted from the light source. The motor rotates the rotary polytope. The bearing rotatably supports a rotation shaft of the motor. The detection processing portion, in a case where the motor is driven at a first speed that is higher than a predetermined reference speed, performs detection of an abnormal state based on an atmospheric temperature detected at a position located within a predetermined first range from the bearing, and in a case where the motor is driven at a second speed that is lower than the reference speed, does not perform the detection of the abnormal state, wherein the abnormal state is a state where the temperature of the bearing has exceeded a predetermined allowable temperature.

An image forming apparatus including: a light source configured to emit a light beam based on an image signal; a deflector configured to deflect the light beam so that the light beam emitted from the light source is scanned on a surface of a photosensitive member in a main scanning direction; a storage portion configured to store a first magnification of an image with respect to a scanning position in the main scanning direction; and a controller configured to generate a second magnification of the image with respect to a reference color image, wherein the controller generates a third magnification based on the first magnification corrected based on the second magnification and the second magnification to correct the image signal based on the third magnification.

An image forming apparatus has a changing portion configured to change, based on a detection result of a temperature sensor, response sensitivity in starting of power supply by a determination portion based on a detection result of a human body detection sensor in a case where a human body approaches the human body detection sensor. The changing portion increases the sensitivity in a case where a temperature detected by the temperature sensor is a second temperature lower than a first temperature than in a case where the temperature detected by the temperature sensor is the first temperature.

An image forming apparatus includes an image carrier, a charging device, an exposure device, a development device, and a development voltage power supply. The development device includes a development container storing a nonmagnetic one-component developer composed only of a toner, and a developer carrier on which a toner layer is formed on an outer circumferential surface thereof. The development voltage power supply applies a development voltage to the developer carrier. The image forming apparatus alternately forms white regions and exposed regions at a predetermined pitch repeatedly on a surface of the image carrier to form a solid image with an area ratio lower than 100%. Where V0 represents a white-region potential of the image carrier, VL represents an exposed-region potential of the image carrier, Vt represents a toner-layer potential, and Vd represents the development voltage, Vd?0.5*(V0?VL)+VL?Vt is fulfilled.

A light emitting device includes a light emitting unit that generates heat as light is emitted, a support portion that supports the light emitting unit, a heating unit that is disposed close to a surface opposite to the light emitting unit with respect to the support portion and that heats the support portion, an air blowing unit that blows air to the light emitting unit from a heating unit side, and a cover portion that is provided between the heating unit and the air blowing unit and that covers the heating unit against wind caused by the air blowing unit.

An image forming apparatus includes an image bearing member, a transfer member, an acquiring portion, an applying portion, and a controller. When a transfer voltage is subjected to constant-voltage control so that the transfer voltage applied to the transfer member by the applying portion is substantially constant, in a case that the transfer voltage, when a toner amount used for a toner image is a first toner amount, is a first voltage, the controller controls the applying portion so that the transfer voltage is a second voltage smaller lower in absolute value than the first voltage in a case that the toner amount is a second toner amount larger greater than the first toner amount. The acquiring portion acquires toner amount information on the toner amount for each toner image transferred onto a single recording material.

An image forming apparatus includes an image bearing member, a frame member including a support surface and made of metal, an exposure unit disposed such that an emission direction in which the light is emitted to the image bearing member is inclined with respect to the support surface, a support member made of metal and configured to support the exposure unit that is in an inclined posture with respect to the support surface, and a positioning member made of resin and configured to be in contact with the exposure unit and position the exposure unit. The support surface of the frame member is in contact with at least one of the support member or the positioning member, and wherein the exposure unit is configured to be attached to the frame member via the support member and the positioning member.

An optical scanning apparatus includes a deflector configured to deflect a light beam from a light source to cause the light beam to scan a surface to be scanned in a main scanning direction, an incident optical system that includes a single incident optical element and is configured to guide the light beam from the light source to the deflector, and an image-forming optical system configured to condense the light beam having been deflected by the deflector as condensing points on the surface to be scanned. At least one of the incident optical system and the image-forming optical system includes a diffractive surface that corrects displacement amounts of the condensing points in a main scanning section and a sub scanning section when a wavelength of the light beam from the light source varies.