| 摘要 |
PURPOSE:To enable to read in color information less in color shear, by installing a detector which can detects corresponding a wave length respectively for a laser beam mixed with two kinds of wave lengths. CONSTITUTION:The laser light having the basic wave length l is illuminated from a laser light source 1, it is fed to the 2nd harmonic generating element 2 to produce 1/2omega wave length, and the laser light from the element 2 is the beam mixed with two kinds of wave length of omega and 1/2omega, and it is a parallel light with the collimator lens 3. After the parallel light from the lens 3 is made to required beam diameter at the beam diameter adjusting element 4, the light flux of the beam diameter is radiated to the rotary mirror 5, the light flux is scanned in synchronizing with the rotary mirror 5 and it is radiated on the parabola mirror 6 located in the plane to be scanned. Further, the reflection light of the mirror 6 is radiated on the plane reflection mirror 7, and the medium 8 is scanned with the reflection mirror 7. The reflection light from the medium 8 is detected at the detectors 9, 9' detecting the wave lengths omega and 1/2omega, and the color information is read in without color shear from the information of the timing detector 11 through the input to the control circuit 10. |
