| 摘要 |
PURPOSE:To improve the space utilizing efficiency of an optical path and to make a titled device small-sized by providing an image forming lens of a reflection type having the third intermediate mirror in the inside, and constituting said device so that the light reflected by the third intermediate mirror is passed through between the first and the second intermediate mirrors and is led to the image forming face. CONSTITUTION:A picture of an original 11 on platen glass 10 is made incident to an image forming lens 15 through an objective lens 12, the first intermediate mirror 13 and the second intermediate mirror 14, and the light emitted from an image forming lens 15 is reflected by the third intermediate mirror 16, and thereafter, is made incident to the image forming lens 15 again. Subsequently, it passes through between the first intermediate mirror 13 and the second intermediate mirror 14, passes through a crossing point A with an incident optical path between them, and an image is formed on a photosensitive body 17. According to such constitution, a large space for forming an emitting optical path having necessary optical path length such as a conventional example becomes unnecessary, and a lens optical device can be made small-sized and thin. |
