| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner capable of enhancing the quality of a formed image by improving the vibration proof ability of a reflection mirror. SOLUTION: This optical scanner has a condensing lens condensing a luminous flux emitted from a light source, a first image forming system condensing the luminous flux from the condensing lens and forming a linear image in the vicinity of the deflecting and reflecting surface of a deflector, a second image forming system performing scanning with the deflected luminous flux by the deflector on the surface to be scanned of an image carrier at a constant speed and condensing the luminous flux as a light spot, and the reflection mirror guiding the deflected luminous flux to the surface to be scanned; and is positioned and supported inside a housing. A scanning positional fluctuation preventing means 20 by vibration is provided for the mirror 7. A pressing member 9 having a resin long lens or a long mirror is arranged in a direction where the mirror 7 is smoothly curved. The supporting parts 10 and 14 of the mirror 7 are provided for the housing, receiving parts 16 and 18 are provided on both ends of the reflecting surface of the mirror 7 and the central part in a length direction, and the receiving parts are supported by the parts 10 and 14.
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