Hologram for hologram scanner and its production

Abstract

Abstract PURPOSE: To prevent the occurrence of shading at the reconstructing by performing hologram recording by the use of the object light and reference light of which the light intensity distributions become stronger from the optical axis thereof toward the outer side thereby producing a hologram. CONSTITUTION: The beam from a laser 21 is divided to object light 23 and reference light 24 by a beam splitter 22. The object light 23 is converged by a mirror 25 and a lens 26 to a pinhole 27, from which it again diverges, passed through an ND filter 28 and is irradiated to a photosensitive film 30 provided on the side face of a cylindrical recording body 29. On the other hand, the reference light 24 passes through a mirror 31, a lens 32, a stop 33, is made into parallel luminous fluxes by a lens 34, passes through an ND filter 35, is converged by a lens 35 and is irradiated to the photosensitive film 30. The ND filters 28, 35 are made higher in density of the central part and lower toward the periphery. By using this hologram, the shading at the reconstructing may be prevented. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Yutaka Kaneko

Bibliographic Details