| 摘要 |
An optical information readout apparatus is disclosed having an image forming optical section 4 operative to shift first and second lenses 24, 25 along an optical axis "O" at areas in front of a photodetector 3 . A cylindrical body 23 incorporates a lens holder means, including permanent magnets 26 to 28 , by which the first lens 24 is halted and held in any of positions a 1 , a 2 and the second lens 24 is halted and held in any of positions b 1 , b 2 . Coils 31, 32, 75, 76 and a control circuit 16 drivingly shift the lenses. The control circuit is operative to independently move the lenses to change a focusing range of the image forming optical section in four different stages in the occurrence of a failure in reading out a two-dimensional code.
|
