| 摘要 |
There is provided a diffraction grid which is easily produced without reducing a grid size. There is provided an optical scanning device having effects such as a chromatic aberration correction and a temperature compensation even when a short wavelength light source having a wavelength of 500 nm or less is used, and an image forming apparatus using the optical scanning device. In the optical scanning device having the diffraction grid, for which the short wavelength light source having a wavelength of 500 nm or less is used, a design order of the diffraction grid is set to a diffraction order equal to or larger than a second order to obtain a grid shape which is easily formed.
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