Light scanner

Abstract

Abstract PURPOSE: To enable to scan linearly with high accuracy, without using an external correction optical system, by making the wavelength of a cpherent light beam at the time of preparing a hologram disk, different from the wavelength of a coherent light beam at the time of reproduction. CONSTITUTION: A hologram 2 having a shaded portion is formed on the circumference of a disk 1 of a center axis Z. A spherical wave 4 is made to interfere with the coordinates F, R made by a plane wave 3 and a focus by meeting at right angles with the disck surface of the axis Z, and when a hologram is photographed by rotating this disk by a prescribed angle each centering around the axis, it is possible to obtain a hologram disk 1 where a hologram has been arrayed in the shape of a ring on the circumference of the disk surface. When the wavelength of a coherent light beam at the time of preparing this hologram disk 1 is made different from the wavelength of a coherent light beam at the time of reproduction, a locus of a scanning line can be varied, linearity can be improved in a prescribed plane, and a long scanning line can be obtained. COPYRIGHT: (C)1982,JPO&Japio

Inventors

• 👤 Seikichi Matsumoto
• 👤 Hiroyuki Ikeda

Bibliographic Details