| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a positional shift of a focus even in the presence of a temperature change, an irregularity in integration accuracy, an irregularity in part accuracy, vibrations, etc. SOLUTION: A plurality of laser lights projected from a semiconductor laser array 1 are condensed within a space area limited by a field lens 2. An optical element 3 obtained by integrating an image formation lens and a Fourier transform element is arranged in the space area. An image by the plurality of laser lights having a Bessel-Gaussian type intensity distribution is formed on a photosensitive drum 6.</p> |
