| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compact and simple-constitution light scanning optical device that the fluctuation of aberration with respect to environmental fluctuation (specially, temperature change) can be excellently corrected and whose characteristic with respect to environment is excellent. SOLUTION: This light scanning optical device is constituted so that a surface to be scanned 8 is scanned with light by guiding luminous flux optically modulated and emitted from a light source means 1 according to an image signal to a deflection means 5 and guiding the luminous flux deflected by the deflection means 5 to the surface to be scanned 8 through a scanning lens system 11 The lens system 11 is constituted of a single scanning lens 6. The lens 6 is formed so that the first surface thereof on the deflection means 5 side is constituted of the aspherical surface and the second surface thereof on the surface to be scanned 8 side is constituted of the surface whose code of the radius of curvature is fixed within a horizontal scanning cross section surface. Besides, a diffraction grating is formed at the second surface.
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