| 摘要 |
PURPOSE:To obtain a highly accurate floodlighting system for automatic focus detection having expanded rangefinding limits by constituting a floodlighting lens of plural lens parts of deviated optical axes and thereby enlarging the extent of projection of a pattern image efficiently to the nearest side. CONSTITUTION:A floodlighting lens 2 is provided with a lens part 23 having an optical axes 21 and a lens part 24 having an optical axis 24. A pattern image 3 is projected by the two lens parts 23, 24 of the floodlighting lens 2 in different directions. For instance, the lens part 23 projects the pattern image 3 in an extent shown by solid lines, and the lens part 24 projects the pattern image 3 in an extent shown by dotted lines which is deviated from the extent of projection by the lens part 23. Thus, by expanding the extent of projection of the pattern image 3, projection of the pattern image on the object face is made possible even when the object moves from a long distance to very short distance. |
