LIGHT SCANNING APPARATUS

摘要

A laser source provides a reconstruction beam (H) of a selectable wavelength which may be different from that of object and reference light beams used in construction of the hologram disc (1). As the hologram disc (1) rotates a scanning locus (6) is provided on a screen (51). By changing the wavelength of the reconstruction beam (H) the form of the locus can be changed, so that a desired curved scanning locus or a straight line scanning locus can be provided.