| 摘要 |
An optical beam scanning device and an image forming apparatus are capable of suppressing adverse effect due to ambient temperature change on plural optical elements. The optical beam scanning device includes a single light deflector, a pre-deflection optical system which is entered a beam from a light source into the light deflector, and a post-deflection optical system which images a reflection beam from the light deflector on a scanned surface, and integrates at least one optical element of the pre-deflection optical system and at least one optical element of the post-deflection optical system. For example, the integrated optical element of the post-deflection optical system is an ftheta lens, and the optical element of the pre-deflection optical system is a correction lens which alleviates an influence by temperature change of the post-deflection optical system.
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