| 摘要 |
PURPOSE:To obtain an unexpensive light scanning device free from the generation of uneven scanning line pitches by arranging a cylindrical lens between a convex lens and a scanning surface in the light scanning device for scanning the reproduced light of a hologram disk on its scanning surface through the convex mirror. CONSTITUTION:Out of two beams 10, 11 divided by a light divider, one beam 10 is vertically penetrated into a disk-like hologram recording material 13 as reference light. The other beam 11 is collected at a pin hole PO through a lens L1 and penetrated into the disk 13 through a cylindrical lens 9 and a convex mirror 7 having its spherical center on a rotational axis 12 to form a hologram. The reproduced light obtained by irradiating the reference light from the lower part of a hologram disk 3' obtained by repeating said exposure is reflected by the convex mirror 7 and collected on a scanning surface P through a ftheta lens 14 and the cylindrical lens 9. Consequently the unevenness of scanning pitches is reduced by the cylindrical lens 9 and the light path length is shortened by the ftheta lens 14. |
