Abstract: An exposure apparatus includes: a substrate that has a light emitting element mounted on a front surface of the substrate; a casing to which the substrate and an optical element are fixed so as to allow the substrate to face the optical element that focuses light emitted from the light emitting element; a sealing material that seals a fitting portion between the substrate and the casing from a rear surface side of the substrate; and a conductive component that is mounted on a ground terminal formed an the rear surface of the substrate and has a height from the rear surface higher than a height of the sealing material at an end portion on a central portion side of the substrate.

Abstract: An exposure apparatus includes: a substrate that has a light emitting element mounted on a front surface of the substrate; a casing to which the substrate and an optical element are fixed so as to allow the substrate to face the optical element that focuses light emitted from the light emitting element; a sealing material that seals a fitting portion between the substrate and the casing from a rear surface side of the substrate; and a conductive component that is mounted on a ground terminal formed on the rear surface of the substrate and has a height from the rear surface higher than a height of the sealing material at an end portion on a central portion side of the substrate.

Abstract: An exposure device includes: a board; a plurality of light emitting elements that are disposed on the board along a longitudinal direction of the board, each of the light emitting elements having a plurality of light emitting points arrayed along the longitudinal direction; a housing that the board and an optical element are fixed to so that the light emitting points are opposed to the optical element; and a control portion that makes control to disable, from emitting light, light emitting points at opposite ends of the board in the longitudinal direction, of all the light emitting points in the plurality of light emitting elements disposed on the board.

Abstract: An exposure device includes a long board, plural light emitting elements arranged along a longitudinal direction of the board on one face of the board, plural inspection electrodes arranged along the longitudinal direction of the board on the other face of the board, and plural electrical wirings each electrically connects between one of the plural light emitting elements and one of the plural inspection electrodes that is not positioned nearest to the one of the plural light emitting elements.

Abstract: A light-emitting device includes: a circuit board including at least two of signal interconnection layers each having plural signal interconnections, at least adjacent two of the signal interconnection layers including signal interconnections provided so that center positions of the respective signal interconnections in a direction intersecting with a longitudinal direction are displaced from each other in portions of the signal interconnections provided in the longitudinal direction; and plural light-emitting chips each having plural light-emitting elements, the light-emitting chips being arrayed in line in the longitudinal direction on a surface of the circuit board.

Abstract: A light-emitting device includes: a board; plural light-emitting chips that are one-dimensionally arrayed in a longitudinal direction of the board and that are connected to a first potential and a second potential; and plural capacitors that each include a first electrode and a second electrode arranged in a short-side direction of the board, and that are arrayed in the longitudinal direction of the board so that the first electrode and the second electrode are alternately positioned between each adjacent two of the capacitors. The first electrode is connected to the first potential for the light-emitting chips, and the second electrode is connected to the second potential for the light-emitting chips.

Abstract: An exposure device includes a long board, plural light emitting elements arranged along a longitudinal direction of the board on one face of the board, plural inspection electrodes arranged along the longitudinal direction of the board on the other face of the board, and plural electrical wirings each electrically connects between one of the plural light emitting elements and one of the plural inspection electrodes that is not positioned nearest to the one of the plural light emitting elements.

Abstract: A light-emitting device includes: a circuit board including at least two of signal interconnection layers each having plural signal interconnections, at least adjacent two of the signal interconnection layers including signal interconnections provided so that center positions of the respective signal interconnections in a direction intersecting with a longitudinal direction are displaced from each other in portions of the signal interconnections provided in the longitudinal direction; and plural light-emitting chips each having plural light-emitting elements, the light-emitting chips being arrayed in line in the longitudinal direction on a surface of the circuit board.

Abstract: A light-emitting device includes: a board; plural light-emitting chips that are one-dimensionally arrayed in a longitudinal direction of the board and that are connected to a first potential and a second potential; and plural capacitors that each include a first electrode and a second electrode arranged in a short-side direction of the board, and that are arrayed in the longitudinal direction of the board so that the first electrode and the second electrode are alternately positioned between each adjacent two of the capacitors. The first electrode is connected to the first potential for the light-emitting chips, and the second electrode is connected to the second potential for the light-emitting chips.