| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanning optical device constituted to prevent the occurrence of such trouble as to give rise to deformation and distortion in optical element parts of laser optical devices by the nonuniformity of the temperature in the device. SOLUTION: The optical scanning optical devices a1 to d1 of the image forming device having plural image carrying members a1 to d1 in order to form the images and the plural optical scanning optical devices a6 to d6 for irradiating the image carrying members a1 to d1 with scanning light in accordance with the image data consist of divided units and these units comprise first optical units au1 to du1 composed of the independent units and second optical units au2 to du2 provided with part of the optical element parts within a common housing 34.
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