An image forming apparatus includes a unit configured to perform image forming operation, a unit board in the unit, a wiring configured to be connected to the unit board, and a control board configured to be connected to the unit board with the wiring and control the unit. The unit board includes a connector to which the wiring is to be connected. A length of the connector in a longitudinal direction of the connector is longer than a length of the unit board in a widthwise direction of the unit board, and the longitudinal direction of the connector intersects the widthwise direction of the unit board.

An image forming apparatus includes a unit configured to perform image forming operation, a unit board in the unit, a wiring configured to be connected to the unit board, and a control board configured to be connected to the unit board with the wiring and control the unit. The unit board includes a connector to which the wiring is to be connected. A length of the connector in a longitudinal direction of the connector is longer than a length of the unit board in a widthwise direction of the unit board, and the longitudinal direction of the connector intersects the widthwise direction of the unit board.

A light guide device includes: a housing main body; a side member attached to a side portion in the housing main body; a light guide body supported by the housing main body and including a light incident surface to which light enters; a light source substrate held by the side member and including a light element that emits the light toward the light incident surface; and a positioning portion configured to position the light element to a reference position with respect to the light incident surface. The positioning portion includes: an abutting member provided in the housing main body and configured to abut on a mounting surface in the light source substrate on which the light element is mounted; and an elastic member held by the side member and configured to press the light source substrate toward the light guide body to position the light element to the reference position.

An exposure head configured to expose a photosensitive drum includes: a substrate; a plurality of strip-shaped semiconductor chips each including a plurality of light emitting elements that emit light and a drive circuit that drives the light emitting element, the plurality of semiconductor chips being arranged on the substrate; and a lens array configured to collect light from the light emitting elements on the photosensitive drum. The drive circuit operates between a first potential and a second potential, the light emitting element operates between a third potential and a fourth potential, and a potential difference between the third potential and the fourth potential is equal to or larger than a potential difference between the first potential and the second potential.

An image forming apparatus includes: an exposure head including a light emitting portion that includes a first electrode layer including a plurality of electrodes that are two-dimensionally arranged in a rotation direction and a rotational axis direction of a photosensitive member, a light emitting layer stacked on the first electrode layer, and a second electrode layer through which light is transmissible; and a controller configured to control a voltage applied to each of the plurality of electrodes in such a way that one pixel is formed by controlling the voltage applied to the plurality of electrodes arranged at different positions in the rotation direction, in which the plurality of electrodes are arranged in such a way that a pitch of the plurality of electrodes included in the first electrode layer in the rotation direction is an integer multiple of a resolution of an image formed by the image forming apparatus in the rotation direction, excluding an equal multiple.

An image forming apparatus includes a unit configured to perform image forming operation, a unit board in the unit, a wiring configured to be connected to the unit board, and a control board configured to be connected to the unit board with the wiring and control the unit. The unit board includes a connector to which the wiring is to be connected. A length of the connector in a longitudinal direction of the connector is longer than a length of the unit board in a widthwise direction of the unit board, and the longitudinal direction of the connector intersects the widthwise direction of the unit board.

An image forming apparatus includes a unit configured to perform image forming operation, a unit board in the unit, a wiring configured to be connected to the unit board, and a control board configured to be connected to the unit board with the wiring and control the unit. The unit board includes a connector to which the wiring is to be connected. A length of the connector in a longitudinal direction of the connector is longer than a length of the unit board in a widthwise direction of the unit board, and the longitudinal direction of the connector intersects the widthwise direction of the unit board.

A process for making up an area of human keratin materials using a makeup device comprising a deformable substrate bearing a transfer surface intended to come into contact with the keratin materials and configured to receive a coat of cosmetic ink. The process includes the following steps: a. depositing at least one cosmetic ink onto the transfer surface by means of at least one digital printer, b. placing the transfer surface in contact with the area to be made up by mechanical action, especially by exerting a pressure on a surface opposite the transfer surface, and c. moving the transfer surface away from the area of the human keratin materials after the ink has been transferred.

A process for making up an area of human keratin materials using a makeup device comprising a deformable substrate bearing a transfer surface intended to come into contact with the keratin materials and configured to receive a coat of cosmetic ink. The process includes the following steps: a. depositing at least one cosmetic ink onto the transfer surface by means of at least one digital printer, b. placing the transfer surface in contact with the area to be made up by mechanical action, especially by exerting a pressure on a surface opposite the transfer surface, and c. moving the transfer surface away from the area of the human keratin materials after the ink has been transferred.

A process for making up an area of human keratin materials using a makeup device including a deformable substrate bearing a transfer surface intended to come into contact with the keratin materials and configured to receive a coat of cosmetic ink. The process includes the following steps: a. depositing at least one cosmetic ink onto the transfer surface by a digital printer, b. placing the transfer surface in contact with the area to be made up by mechanical action, especially by exerting a pressure on a surface opposite the transfer surface, and c. moving the transfer surface away from the area of the human keratin materials after the ink has been transferred.