Abstract: An image forming apparatus includes a plurality of optical scanning devices, a job receiver, a job executor, an image discriminator for discriminating whether a formation-target image included in an image forming job is a single-color image or a multi-color image, a first condition judger, a second condition judger and a temperature adjuster. In the case of forming a single-color image, the temperature adjuster drives motors of all the optical scanning devices if a predetermined first condition and a predetermined second condition are satisfied and drives the motor of one optical scanning device and does not drive the motors of the other optical scanning devices but the one optical scanning device if the first condition is satisfied, but the second condition is not satisfied.

Abstract: A light source device includes: a light source; a package member that holds the light source; a splitting element that is arranged on an optical path of a light beam output from the light source and splits the light beam into a first light beam and a second light beam; and a cap member that holds the splitting element so that the surface of the splitting element is inclined with respect to a plane orthogonal to a traveling direction of the light beam output from the light source and that is attached to the package member to seal the light source.

Abstract: In a color misalignment detection method, an alignment pattern is obtained by designating a plurality of lines having line width and line intervals formed by superposing a line image of a black color as a reference color and a line image of a color other than the reference color, for example, a cyan line image, as one patch, and continuously forming these patches by shifting the relative position between the line images of the two colors by an optional quantity. An alignment pattern detection sensor has a light emitting diode and a photodiode. These elements are arranged along the scanning direction of the alignment pattern such that the photodiode can only receive diffused reflected light of reflected light from the alignment pattern. A spot shape of the light emitting diode and a spot shape of the photodiode are both formed in a square shape.

Abstract: In an optical discharge apparatus used in an electrographic image forming apparatus, by forming, on a light guiding member, a diffusing reflecting face for reflecting light from an LED lamp towards a photosensitive drum, and by supplementing the amount of light by altering the height of the diffusing reflecting face to the light emitting face and the width of the diffusing reflecting face in accordance with their distance from the light source, the light intensity distribution of the irradiating light that is irradiated onto the photosensitive drum is made uniform. An optical discharge apparatus may include a light guiding member arranged facing a photoreceptor; and a light source, a diffusing reflecting face for reflecting the light from the light source toward the photoreceptor is formed on the light guiding member, and a reflecting member is arranged on an upper face in the vicinity of an end portion of the light guiding member.

Abstract: There is disclosed a lightweight and small liquid crystal display which achieves low power consumption and in which the optical anisotropy of the liquid crystal material is compensated for in order to enhance the viewing angle characteristics and the response speed of the liquid crystal material. Display electrodes and a common electrode are formed on one of the substrates. The orientation of the liquid crystal material is of the HAN (hybrid alignment nematic) type. This compensates for the optical anisotropy of the liquid crystal material and improves the response speed.

Abstract: An image forming apparatus includes a photosensitive member; a charging member for charging the photosensitive member; an exposure device for exposing an image formation area of the photosensitive member charged by the charging member to light in accordance with an image signal to for an electrostatic image, and for exposing non-image-formation area around the image formation area to spots of light; and a developing device, having a developer carrying member for carrying a layer of developer having a thickness smaller than the gap with which the developer carrying member is opposed to the photosensitive member, for effecting reverse development of the electrostatic image.