Abstract: An exposure device includes an exposure member, a positioning member, and a movement restricting member. The exposure member includes multiple light-emitting devices arranged along a first direction, which is an axial direction of an image carrier that rotates. The exposure member exposes the image carrier to light by emitting light in a second direction, which is a direction from the multiple light-emitting devices to the image carrier. The positioning member determines a position of the exposure member in the second direction relative to the image carrier by causing the exposure member to abut against the image carrier in the second direction. The movement restricting member is disposed on an end portion of the exposure member in the first direction and restricts movement of the exposure member relative to the positioning member.

Abstract: An exposure device includes an exposure member, a positioning member, and a movement restricting member. The exposure member includes multiple light-emitting devices arranged along a first direction, which is an axial direction of an image carrier that rotates. The exposure member exposes the image carrier to light by emitting light in a second direction, which is a direction from the multiple light-emitting devices to the image carrier. The positioning member determines a position of the exposure member in the second direction relative to the image carrier by causing the exposure member to abut against the image carrier in the second direction. The movement restricting member is disposed on an end portion of the exposure member in the first direction and restricts movement of the exposure member relative to the positioning member.

Abstract: An optical scanning device includes a rotating body having a rotating polygon mirror that deflects a light beam; a circuit board having a supporting member that supports the rotating member and a driving unit that drives the rotating body; a container containing the rotating body and the circuit board and having a positioning portion that positions a positioned portion of the rotating body, the positioned portion projecting from the circuit board; first and second fastening portions that fasten the circuit board to the container; and an adjusting portion that adjusts an angle of a rotating shaft of the rotating body with respect to the container. A virtual straight line connecting the first and second fastening portions passes through the rotating body when seen in an axial direction of the rotating shaft. The adjusting portion resides on a side of the virtual straight line opposite the rotating shaft.

Abstract: An optical scanning device includes a rotating body having a rotating polygon mirror that deflects a light beam; a circuit board having a supporting member that supports the rotating member and a driving unit that drives the rotating body; a container containing the rotating body and the circuit board and having a positioning portion that positions a positioned portion of the rotating body, the positioned portion projecting from the circuit board; first and second fastening portions that fasten the circuit board to the container; and an adjusting portion that adjusts an angle of a rotating shaft of the rotating body with respect to the container. A virtual straight line connecting the first and second fastening portions passes through the rotating body when seen in an axial direction of the rotating shaft. The adjusting portion resides on a side of the virtual straight line opposite the rotating shaft.

Abstract: Disclosed a multicolor image forming apparatus that facilitates correction operations to correct skews of a plurality of images. Turing a dial of an adjusting apparatus tilts a cylindrical mirror and thereby changes an irradiation position of a light beam to be irradiated onto a photoreceptor. Since the rotation of the dial and the movement of the cylindrical mirror correspond, an operator can know the state of the cylindrical mirror by visually checking a mark of the dial and a scale plate. When a color skew of images occurs, the operator can perform easily adjustment operations by the adjusting apparatus while checking a color skew amount and the state of a corresponding cylindrical mirror by the mark and the scale plate.

Abstract: An optical scanning apparatus for simultaneously scanning a plurality of light beams. In the apparatus, four light beams emitted from two light emitting portions are allowed to sequentially pass through collimator lenses and cylindrical lenses. Then, a beam splitter synthesizes the light beams so as to be emitted to a mirror surface of a polygonal mirror. Then, the light beams are deflected when the polygonal mirror is rotated so as to be allowed to pass through an imaging lens. Then, the light beams scan and expose (main-scan) the surface of a photosensitive member. When the photosensitive member is rotated by a predetermined quantity, sub-scanning is performed. When the above-mentioned main and sub-scanning are repeated, a latent image for one page is formed on the photosensitive member. When the above-mentioned sequential processes are performed, interlaced scanning is performed under predetermined conditions.

Abstract: An optical scanning apparatus for simultaneously scanning a plurality of light beams. In the apparatus, four light beams emitted from two light emitting portions are allowed to sequentially pass through collimator lenses and cylindrical lenses. Then, a beam splitter synthesizes the light beams so as to be emitted to a mirror surface of a polygonal mirror. Then, the light beams are deflected when the polygonal mirror is rotated so as to be allowed to pass through an imaging lens. Then, the light beams scan and expose (main-scan) the surface of a photosensitive member. When the photosensitive member is rotated by a predetermined quantity, sub-scanning is performed. When the above-mentioned main and sub-scanning are repeated, a latent image for one page is formed on the photosensitive member. When the above-mentioned sequential processes are performed, interlaced scanning is performed under predetermined conditions.

Abstract: A pneumatic and magnetic bearing type motor provides a hollow rotary member fitted rotatably on a stationary shaft, radial pneumatic bearings having dynamic pressure generating grooves formed on one of the stationary shaft and hollow rotary member, supporting the hollow rotary member in a radial direction with the aid of dynamic pressures generated, and a thrust magnetic bearing supporting the hollow rotary member in a thrust direction thereof. In the motor, the position where the hollow rotary member is supported by the thrust magnetic bearing is substantially coincident with the equilibrium point where moments of the pressures are equal, whereby the motor is substantially free from vibration during operation, and the bearings are substantially prevented from being damaged when the motor is started or stopped.