Patent ID: 7956318

Claim:
An optical scanning device, comprising: a light source; a light deflector for deflecting and scanning a light beam from the light source; a scanning imaging optical system for imaging the light beam via the light deflector onto a scanned face; a light beam detecting device for detecting a position of the light beam; a separation optical system provided in the light beam detecting device for separating the light beam into a plurality of separation light beams in a sub-scanning direction; a plurality of light detectors provided in the light beam detecting device to be disposed in different positions in the sub-scanning direction, each of the light detectors detecting a separation light beam; and a plurality of light receiving sections separated in the sub-scanning direction and provided in the light detectors, respectively, wherein an inclination of one side of the light receiving section that the light beam cuts across in at least one of the plurality of light detectors relative to the sub-scanning direction is different from an inclination of one side of the light receiving section that the light beam cuts across in the other light detector relative to the sub-scanning direction; and wherein the plurality of light detectors has the same shape and the same structure, the one side of the light receiving section of the other light detector is disposed parallel to the sub-scanning direction, and at least one light detector is tilted to the sub-scanning direction such that the one side of the light receiving section has a predetermined angle to the one side of the light receiving section of the other light detector.