| 摘要 |
<p>PURPOSE:To decrease return distortions by forming double refracting transparent plates having the sepn. distance equal to the pitch in such a manner that the sepn. distance component in the scanning direction is half the pitch and that the sepn. distance component in the opposite direction is also half the pitch. CONSTITUTION:Rays 251, 252 are double refracted in the 2nd crystal plate 22 and are so separated that the sepn. distance component in the u-axis direction attains P22u equal to a/2 and the sepn. distance component in the v-axis direction attains P22v equal to b/2 (=a/2), namely, said rays are separated by the distance P22 (=a/sq. rt. 2) in the direction +45 deg. with respect to the u-axis by which the rays are separated to 251 and 253 as well as 252 and 254. The sepn. directions are in the direction 45 deg. with resepct to the respective polarization directions of the rays 251, 252 and therefore half the respective components of the rays 251, 2524 remain and half the same are separated. The intensities of the rays 251-254 are 1/4 the intensity of the original unit luminous flux and equal to each other. The return components from the carrier are thereby decreased and the components of the return distortion part are decreased.</p> |
