JP2008026410A5 - - Google Patents

Claims (19)

In an optical scanning device that optically scans a surface to be scanned along a main scanning direction with a plurality of light beams emitted from a light source, 2n (where n ≧ 1) light emitting units having m (where m ≧ 1) A light source unit;
An optical deflector in which (m × n) luminous fluxes from the respective light source units are incident to face the rotation center;
2n (where n ≧ 1) number of scanned surfaces corresponding to 2n (where n ≧ 1) light source units and m (where m ≧ 1) light beams of the light emitting unit are subjected to light deflection. A scanning lens system that forms an image on 2n (where n ≧ 1) of the scanned surfaces arranged so as to oppose each other,
2n (where n ≧ 1) writing width centers on the surface to be scanned and rotation centers of the optical polarizer are arranged in a straight line so that the deflected light beam of the optical deflector is written into the scanning light beam. Synchronous light receiving means for receiving light as a synchronous light beam for determining timing ,
The scanning lens system has a special toric surface in which at least one surface connects a center of curvature in the sub-scanning section in the main scanning section to a non-linear line, and the main scanning of the curvature in the sub-scanning section of the special toric surface An optical scanning device comprising a change along a direction as a non-target with respect to the optical axis of the scanning lens surface . The optical scanning device according to claim 1,
The light source unit includes a semiconductor laser array in which a plurality of the light emitting units are arranged in a line. The optical scanning device according to claim 1 or 2,
The scanning optical system of the optical deflector has a function of optically scanning a light spot on a surface to be scanned at a constant speed in the main scanning direction. The optical scanning device according to claim 1, 2, or 3,
The scanning optical system of the optical deflector is provided with a function of correcting surface tilt of the optical deflector in the sub-scanning direction. In the optical scanning device according to any one of claims 1 to 4,
The scanning lens system includes the scanning lenses L1, L2,... Lj (j = 1.2,...) And the light in the order closer to the optical deflector of the scanning lens system including one or more scanning lenses L. Scanning lenses M1, M2,... Mj (j = 1.2,...), The scanning lens Lj and the scanning lens Mj having the same shape. In the optical scanning device according to any one of claims 1 to 5,
The scanning lens system includes an anamorphic surface, and is an optical scanning device. In the optical scanning device according to any one of claims 1 to 6,
The scanning lens system includes the scanning lens constituted by a single lens. In the optical scanning device according to any one of claims 1 to 7,
The scanning lens system includes the scanning lens formed of a resin. In the optical scanning device according to any one of claims 1 to 8,
The scanning lens system includes at least one scanning lens having an optical axis inclined with respect to a normal line of a surface to be scanned. In the optical scanning device according to any one of claims 1 to 9,
The optical scanning device according to claim 1, wherein the synchronous light receiving means includes a synchronous light beam that does not pass through the scanning lens system used for determining the writing timing. In the optical scanning device according to any one of claims 1 to 10,
The optical scanning device according to claim 1, wherein the light beam has an angle in a sub-scanning direction with respect to a normal line of a reflection surface of the optical deflector. In an optical writing device for forming an image by scanning a surface to be scanned along a main scanning direction with a plurality of light beams emitted from a light source,
The optical scanning device according to any one of claims 1 to 11,
An optical writing apparatus comprising image writing means for optically scanning the surface to be scanned by the optical scanning apparatus and writing an image. The optical writing device according to claim 12,
An optical writing device comprising a plurality of the optical scanning devices stacked in the sub-scanning direction. The optical writing device according to claim 13,
Each of the optical scanning devices stacked in the sub-scanning direction includes the optical deflector having a common rotation axis. The optical writing device according to claim 13 or 14,
Each of the optical scanning devices stacked in the sub-scanning direction has different incident angles in the main scanning direction of upper and lower light beams incident on the same phase plane of the optical deflector. The optical writing device according to any one of claims 13 to 15,
Each of the optical scanning devices stacked in the sub-scanning direction includes different reflection points deflected in the main scanning direction of upper and lower light beams incident on the same phase plane of the optical deflector. The optical writing device according to claim 12,
The two optical scanning devices are arranged in parallel so that the main scanning planes are the same. In an image forming apparatus for forming a recorded image on a recording medium,
The optical scanning device according to any one of claims 1 to 11, or the optical writing device according to any one of claims 12 to 17,
An image forming apparatus comprising: an image forming unit that forms a recorded image on a recording medium by the optical scanning device or the optical writing device. In an image forming apparatus for forming a color recording image on a recording medium,
The optical scanning device according to any one of claims 1 to 11, or the optical writing device according to any one of claims 12 to 17,
An image forming apparatus comprising: an image forming unit that forms a color recording image on a recording medium by the optical scanning device or the optical writing device.