A semiconductor device includes a base material and light emitting elements (or LEE) aligned in a first direction on the base material. Among the LEEs, a first LEE is provided with a first semiconductor multilayer structure and a first organic insulating film. Among the LEEs, a second LEE is provided with a second semiconductor multilayer structure and a second organic insulating film. A first multilayer structure width is smaller than a second multilayer structure width that is the first direction width of the second semiconductor multilayer structure, a first multilayer structure thickness is narrower than a second multilayer structure thickness, and a first film thickness is greater than a second film thickness wherein the first film thickness is a thickness of a portion of the first organic insulating film and a second film thickness is a thickness of a portion of the second organic insulating film.

An image forming apparatus includes an exposure head having an odd number of chips in each of which a plurality of light emitting elements configured to expose a photosensitive member are arrayed at intervals corresponding to a first resolution in an intersecting direction intersecting with a rotation direction of the photosensitive member. An even number of chips of the odd number of chips are arranged on one side of the printed circuit board in the rotation direction, and a remaining odd number of chips of the odd number of chips are arranged on another side of the printed circuit board. A center of an intensity of a light amount of the odd number of chips in the rotation direction is shifted to a side of the even number of chips with respect to a center of the printed circuit board in the rotation direction.

Provided is a semiconductor light-emitting device including a plurality of nodes and a plurality of transfer diodes connecting the nodes, and gates of a shift thyristor and a light-emitting thyristor are connected to each of the nodes. Each of the transfer diodes includes a stacked structure including a first semiconductor layer of a first conductivity type provided over a semiconductor substrate, a second semiconductor layer of a second conductivity type, which is different from the first conductivity type, provided over the first semiconductor layer, a third semiconductor layer of the first conductivity type provided over the second semiconductor layer, a fourth semiconductor layer of the second conductivity type provided over the third semiconductor layer, and a fifth semiconductor layer of the first conductivity type provided over the fourth semiconductor layer, and a diode is formed by a p-n junction between the fourth and fifth semiconductor layers.

An image forming apparatus includes a port to permit a imaging unit to be installed. A solid head unit has a base, a lifting mechanism, a print head, and a first guide. The lifting mechanism moves the print head up and down. The first guide includes a first guide rail facing the print head that limits the movement of the print head to a first range when the print head and a second, greater range when the print head is raised. The imaging unit includes a photoconductive drum in a drum case that includes a projection facing the solid head unit. The projection is configured to insert into a hole in the print head when the print head is raised.

An image forming apparatus includes a photoconductive body, a light source, a lens, a light housing, a first fulcrum, a second fulcrum, a stay, and a repositioning mechanism. The lens is positioned to focus light emitted from the light source at a focal position. The light housing holds the light source and the lens. The fulcrums are positioned such that a surface of the photoconductive body is positioned at the focal position when the light housing engages the first fulcrum and the second fulcrum. The stay is positioned to support the light housing at two or more points between the fulcrums. The repositioning mechanism is coupled to the stay. The light housing presses against the fulcrums when the repositioning mechanism is in a first orientation and is spaced from the fulcrums when the repositioning mechanism is in a second orientation.

An image forming apparatus includes a drum unit, an optical print head, a moving mechanism, a moving mechanism supporting member, a main assembly, a flexible flat cable, a first cover portion made of a resin material and provided in the supporting member so as to cover a first portion of a cutting plane of the opening, the first portion opposing one surface of the flexible flat cable, and a second cover portion made of a resin material and provided in the supporting member so as to cover a second portion of the cutting plane of the opening, the second portion opposing the other surface of the flexible flat cable.

An image forming apparatus includes a port to permit a imaging unit to be installed. A solid head unit has a base, a lifting mechanism, a print head, and a first guide. The lifting mechanism moves the print head up and down. The first guide includes a first guide rail facing the print head that limits the movement of the print head to a first range when the print head and a second, greater range when the print head is raised. The imaging unit includes a photoconductive drum in a drum case that includes a projection facing the solid head unit. The projection is configured to insert into a hole in the print head when the print head is raised.

An exposure head for forming an image of a first resolution corresponding to an arrangement interval of a plurality of lower electrodes in a crossing direction or an image of a second resolution lower than the first resolution. A circuit portion 602 includes an image data storage portion 804 which is arranged on the substrate together with a plurality of lower electrodes and converts input image data into image data according to the resolution. By this, the same exposure head can be used for both high resolution images and low resolution images without degrading the image quality.

According to one embodiment, an image forming apparatus includes a light emitting element array, a photosensitive member, a transparent member, a gap spacer, and a biasing member. The light emitting element array includes a plurality of light emitting elements. The photosensitive member forms a latent image by being exposed by light emitted from the light emitting element array. The transparent member is positioned between the photosensitive member and the light emitting element array. The transparent member has a relative position fixed with respect to the light emitting element array, and transmits the light emitted from the light emitting element array. The gap spacer keeps a distance between the photosensitive member and the transparent member constant. The biasing member biases the transparent member toward the photosensitive member.

According to one embodiment, an image forming apparatus includes a light emitting element array, a photosensitive member, a transparent member, a gap spacer, and a biasing member. The light emitting element array includes a plurality of light emitting elements. The photosensitive member forms a latent image by being exposed by light emitted from the light emitting element array. The transparent member is positioned between the photosensitive member and the light emitting element array. The transparent member has a relative position fixed with respect to the light emitting element array, and transmits the light emitted from the light emitting element array. The gap spacer keeps a distance between the photosensitive member and the transparent member constant. The biasing member biases the transparent member toward the photosensitive member.