Patent ID: 6198554
Filing Date: 2001-03-06
Classification: G02B,G03H,H04N

Abstract:
A method for producing a hologram recording an interference fringe formed by an object light which has diffusing and scattering characteristics, and a reference light on a photosensitive dry plate, comprising the steps of:calculating a ratio .eta..sub.RO /.eta..sub.OO of a first diffraction efficiency .eta..sub.OO and a second diffraction efficiency .eta..sub.RO, the first diffraction efficiency .eta..sub.OO being obtained by the interference fringe formed by two object lights, and the second diffraction efficiency .eta..sub.RO being obtained by the interference fringe formed by the object light and the reference light; andadjusting an intensity E.sub.O of the object light and the intensity E.sub.R of the reference light in such a way that the ratio .eta..sub.RO /.eta..sub.OO is set to at least 10, and the first diffraction efficiency .eta..sub.OO does not exceed 5%, so that transparency of the hologram is ensured when no image is projected on the hologram.