| 摘要 |
<P>PROBLEM TO BE SOLVED: To radiate marker light matching an actual reading sight when a focal length in an image formation optical part is varied. <P>SOLUTION: An image forming optical part 14 positioned in the front part of a light receiving sensor 13 is provided with a focal point variation mechanism moving a part of a lens for changing a focal length (an angle of view) in three steps. Based on a distance measuring sensor measuring a distance to a read object R with an information code, a control circuit controls the focal point variation mechanism. A marker light radiation part 16 is provided with an LED and a marker image formation lens to radiate marker light M for showing a reading point (reading view V) to the read object R. A marker light regulation mechanism is arranged for moving the LED backward/forward for changing the dimension of the marker light M in three steps according to the dimension of a view (a distance to the read object R) of the image forming optical part 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
