Provided is an image forming apparatus including an image forming section that periodically forms a color calibration image which is used for color adjustment along with an image on a recording material, a color information obtaining section that periodically obtains color information of the color calibration image which is formed on the recording material before color adjustment which is periodically performed, and a color adjusting section that, based on plural pieces of the color information that is obtained by the color information obtaining section, performs color adjustment on an image formed by the image forming section such that a difference between a color of an image which is supposed to be output and a color of an image which is output is reduced by a next color adjustment.

A lens unit according to one or more embodiments includes a lens plate member including a plurality of lenses arranged in a first direction; and a light block member provided facing the lens plate member and including a plurality of opening portions arranged in the first direction, the opening portions being provided in one-to-one correspondence with the lenses. A first positioning portion is formed at a first position in first direction of each of the lens plate member and the light block member. The first positioning portion of the lens plate member and the first positioning portion of the light block member align with each other and continuously extend in a second direction along an optical axis direction of the lenses.

A lens unit according to one or more embodiments includes a lens plate member including a plurality of lenses arranged in a first direction; and a light block member provided facing the lens plate member and including a plurality of opening portions arranged in the first direction, the opening portions being provided in one-to-one correspondence with the lenses. A first positioning portion is formed at a first position in first direction of each of the lens plate member and the light block member. The first positioning portion of the lens plate member and the first positioning portion of the light block member align with each other and continuously extend in a second direction along an optical axis direction of the lenses.

Provided is an optical scanning apparatus, including: a deflector which deflects light beams with first and second deflection surfaces to scan first and second scanned surfaces in a main scanning direction; first and second imaging optical systems which guide the deflected light beams to the first and second scanned surfaces; and an incident optical system which allows the light beam to obliquely enter the first deflection surface in a sub-scanning section, in which the first imaging optical system includes a first optical element having an absolute value of curvature radius of incident surface smaller than an absolute value of curvature radius of exit surface in the sub-scanning section including an optical axis, and the incident surface of the first optical element reflects the light beam entering the incident surface toward a direction of separating from a main scanning section including the deflector in the sub-scanning section including the optical axis.

Provided is an optical scanning apparatus, including: a deflector which deflects light beams with first and second deflection surfaces to scan first and second scanned surfaces in a main scanning direction; first and second imaging optical systems which guide the deflected light beams to the first and second scanned surfaces; and an incident optical system which allows the light beam to obliquely enter the first deflection surface in a sub-scanning section, in which the first imaging optical system includes a first optical element having an absolute value of curvature radius of incident surface smaller than an absolute value of curvature radius of exit surface in the sub-scanning section including an optical axis, and the incident surface of the first optical element reflects the light beam entering the incident surface toward a direction of separating from a main scanning section including the deflector in the sub-scanning section including the optical axis.

A roller support device includes a roller including a cylindrical portion having a through hole, a support member attached to a portion of an outer peripheral surface of the roller adjacent to the through hole to support the roller so that the roller is rotatable, and a restricting member including a bent hook and a contact portion. The restricting member restrains the support member from moving in a first direction of a rotation axis of the roller by contacting the support member at the contact portion. The bent hook is bent so as to extend to an inside of the cylindrical portion through the through hole and oppose a portion of the inner peripheral surface surrounding the through hole. The contact portion is disposed so as to extend in a circumferential direction of an outer peripheral surface of the roller and being capable of contacting the support member.

A roller support device includes a roller including a cylindrical portion having a through hole, a support member attached to a portion of an outer peripheral surface of the roller adjacent to the through hole to support the roller so that the roller is rotatable, and a restricting member including a bent hook and a contact portion. The restricting member restrains the support member from moving in a first direction of a rotation axis of the roller by contacting the support member at the contact portion. The bent hook is bent so as to extend to an inside of the cylindrical portion through the through hole and oppose a portion of the inner peripheral surface surrounding the through hole. The contact portion is disposed so as to extend in a circumferential direction of an outer peripheral surface of the roller and being capable of contacting the support member.

A light guide body that extends in a rod shape and guides light incident from an end surface thereof to emit the light from a circumferential surface thereof, the light guide body having a shape such that according to an angle of a circumferential direction around the light guide body, an amount of emitting light in a direction of the angle is different. Additionally, a static elimination device and an image forming apparatus include the light guide body.

A light guide body that extends in a rod shape and guides light incident from an end surface thereof to emit the light from a circumferential surface thereof, the light guide body having a shape such that according to an angle of a circumferential direction around the light guide body, an amount of emitting light in a direction of the angle is different. Additionally, a static elimination device and an image forming apparatus include the light guide body.

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.