LIGHT SOURCE DEVICE

PROBLEM TO BE SOLVED: To attain the small sizing of an optical apparatus in which a plurality of light source parts are arranged side by side on a frame. SOLUTION: A light source device 1 is used for an image forming apparatus. A laser diode emits a beam. A collimator lens rectifies the beam. An optical element holder has a first side surface and a second side surface which are counter to each other in the main scanning direction vertical to the optical axis of the beam and retains the collimator lens. A laser element holder includes a flange part retaining the laser diode, a first arm part joined onto the first side surface and a second arm part joined onto the second side surface. The plurality of light source parts 4 are disposed on the frame 3 so that they are arranged side by side in the main scanning direction and superimposed on the light source parts 4 adjacent to each other and the light axis direction of the beam. COPYRIGHT: (C)2009,JPO&INPIT