Flat bed scanning type image reader.

摘要

An apparatus for reading an image by using a CCD line sensor (18), including a half mirror (19) or the like disposed on an optical path extending from an input optical system to the CCD line sensor, and a linear light source (22) disposed on an optical path branched out by the half mirror. The linear light source is located at a position equivalent to the CCD line sensor with respect to a document table (11), and is equal in length to an effective pixel region of the CCD line sensor. Light emitted from the light source is projected back to the document table. An effective image reading area is displayed on the document table by relatively moving the document table and linear projected image in a sub-scanning direction. The linear light source is rotatable in accordance with a setting angle of an original. Consequently, an inclined image is projected back to the document table to serve as a guideline for setting the original. Where a spot light source is substituted for the linear light source, a spot image projected back to the document table is moved along a trimming area of an original. The trimming area is automatically determined by detecting distances of movement of the spot image.