An image forming apparatus includes: a plurality of photoreceptors; a plurality of exposure heads provided so as to correspond to the plurality of photoreceptors, respectively, each of the plurality of exposure heads including a plurality of light emitting units configured to emit light for exposing the corresponding photoreceptor, the plurality of light emitting units being arranged along a rotation axis line of the corresponding photoreceptor; and a generation unit configured to generate a line synchronization signal for each of the plurality of exposure heads to control a light emission timing in a rotating direction of the corresponding photoreceptor, the generation unit being configured to adjust a cycle of the line synchronization signal in accordance with each of the plurality of exposure heads.

When mounting a plurality of light emitting chips on a substrate, there is a risk that adhesive protruding from a light emitting chip comes into contact with an adjacent light emitting chip and affects mounting position accuracy of the light emitting chip with respect to the substrate. The adhesive that bonds the substrate and the light emitting chip includes a protruding area that does not overlap with the light emitting chip, viewed from a direction perpendicular to a surface of the substrate. The protruding area includes a first protruding area located on one side and a second protruding area located on the other side with respect to the light emitting chip in a transverse direction of the substrate. The first protruding area may be larger than the second protruding area.

An exposure device includes a substrate on which a plurality of light emitting elements is mounted, a lens array that condenses light emitted from the light emitting elements onto a photoconductor, a holding member that holds the substrate and the lens array, a support member that supports the holding member from a side opposite to the lens array via the substrate, and forms a duct forming a flow path of an air flow on a back surface side of the substrate held by the holding member, a protrusion that separates the duct into a duct portion forming a flow path of an air flow from one side to a second side of the substrate and a non-duct portion located further toward the one side than the duct portion, and an elastic member that seals a gap between the duct portion and the non-duct portion.

An image forming apparatus includes a photoconductor, an exposure head that includes a substrate on which a plurality of light emitting elements is mounted in a longitudinal direction that is an axial direction of the photoconductor, and a lens array including a plurality of lenses that condenses light emitted from the light emitting elements onto the photoconductor, and exposes the photoconductor, a longitudinal-shaped cleaning rod that is inserted from outside of the image forming apparatus and cleans emission surfaces of the lenses by rubbing the lenses in the longitudinal direction, and a guide member that guides the cleaning rod inserted from the outside of the image forming apparatus, in which the cleaning rod includes a cleaning member that abuts on the emission surfaces of the lenses and cleans off attached matter attached to the emission surfaces of the lenses, a first portion whose cross-sectional shape in a direction orthogonal to the longitudinal direction is a first cross-sectional shape, and a second portion that is provided at a position different from a position of the first portion in the longitudinal direction and has a second cross-sectional shape different from the first cross-sectional shape of the first portion.

An image forming apparatus includes: a rotatable photoconductor; an exposure portion including a substrate on which a plurality of chips each including a plurality of light emitting portions that emit light for exposing the photoconductor is mounted, and a support portion configured to support the substrate; a fan configured to generate an airflow for cooling the exposure portion; and a duct configured to communicate with the fan and to communicate with the support portion to guide the airflow generated by the fan to the substrate.

An image forming apparatus includes: a photoconductor; a charging portion that charges a surface of the photoconductor; an exposure portion including a substrate including a plurality of light emitting portions for exposing the photoconductor; a developing portion that develops a latent image formed on the surface of the photoconductor with toner; a fan that generates an airflow for cooling the exposure portion; and a duct that communicates with the fan and communicates with the support portion, the duct guiding the airflow generated by the fan to the substrate; in which a part of the duct is formed by a charging support portion that supports the charging portion, a developing support portion that supports the development, and a duct portion, and a space between the duct portion and the charging support portion and a space between the duct portion and the developing support portion are sealed by a sealing member.

An image forming apparatus includes a panel member that opposes a photoreceptor and has plural light-emitting elements. The panel member has plural element groups, in which the light-emitting elements are arranged in a main scanning direction along a rotation axis of the photoreceptor. Each of the element groups includes: forward order arrangement in which the plural light-emitting elements are arranged such that positions thereof in a sub-scanning direction orthogonal to the main scanning direction are shifted from one end side to the other end side toward one side in the main scanning direction; and reverse order arrangement in which the plural light-emitting elements are arranged such that positions thereof in the sub-scanning direction are shifted from the other end side to the one end side toward the one side in the main scanning direction.

A print head 3 includes: a light-emitting element substrate 311 having a plurality of light-emitting elements 31-31 arranged in a line; a lens array 32 that focuses light emitted from the plurality of light-emitting elements 31-31 onto an image carrier (1); and a support member 316 that supports the light-emitting element substrate 311, and a film-like protruding portion 317 protrudes from the support member 316. The support member 316 is provided with a space SP having an opening SPa opened to the outside. The protruding portion 317 is disposed in a state of being bent from the opening SPa of the space SP into the space SP.

An image forming apparatus includes a photosensitive member, light-emitting chips, and a controller integrated circuit (IC). Provided in each of the light-emitting chips are a plurality of light-emitting units that emit light for exposing the photosensitive member, a circuit unit that turns on and off the plurality of light-emitting units based on image data, and a storage unit that stores control data indicating a target amount of light of the plurality of light-emitting units. The light-emitting chips are arranged along a rotational axis direction of the photosensitive member. Each of the light-emitting chips is connected to the controller IC by a different one of a plurality of signal lines. In a case where the output control data is transmitted from the controller IC to each of the light-emitting chips via the different one of the plurality of signal lines, the transmitted control data is stored in the storage unit.

An image forming device includes a panel member that faces a photoreceptor and includes a plurality of light-emitting elements. An exposure device includes a signal output unit that outputs drive signals having different phases, and a driver that causes each of the plurality of light-emitting elements to emit light individually, based on the drive signals. In the panel member, element arrays including the plurality of light-emitting elements arranged in a main scanning direction are arranged in a plurality of stages arranged in a sub-scanning direction. The signal output unit outputs the drive signals having a phase difference to the element arrays, respectively. A distance in the sub-scanning direction between the element arrays adjacent to each other is set based on a phase correction value obtained by multiplying a circumferential speed of the front surface of the photoreceptor by the phase difference.