| 摘要 |
<p>PURPOSE:To prevent the positional shift of the condensing points on a photosensitive drum and to enhance resolving power by parallelly arranging a microlens array in the vicinity of the photosensitive drum so that the arranging direction of microlenses is made to coincide with a luminous flux arranging direction and refracting incident luminous flux in the optical axis direction of the microlenses. CONSTITUTION:Linearly continued condensing points are formed on an image forming surface by many luminous fluxes radially incident on the image forming surface from light sources 4, 7 through condensing lenses 1,8. In this optical system, a microlens array 10 wherein many microlenses 9 are linearly and continuously formed is parallelly arranged in the vicinity of the image forming surface so that the arranging direction of the microlenses 9 is allowed to coincide with the arranging direction of luminous fluxes 2 and the respective luminous fluxes 2 incident through the condensing lenses 1,8 are refracted in the optical axis direction of the microlenses 9. As a result, the positional shift of the condensing points on the photosensitive drum can be prevented and resolving power can be enhanced and a dimensional common difference is taken wide to achieve mass production.</p> |
