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AssigneeNippon Electric Co., Ltd.
InventorYuzo Ono
Estimating the term…
A hologram is manufactured by making a plurality of coherent spherical-wave beams, N (.gtoreq.3) in number, interfere with one after another to provide a multiplicity of interference fringe configurations. A phase subtract aspheric-wave is produced by an auxiliary hologram manufactured by the use of two of the spherical-waves. The aspheric-wave is made to interfere with a third spherical-wave or a similar aspheric-wave. Phase distribution .phi..sub.N on the interference fringes is defined by: ##EQU1## where r represents a distance on the hologram between a predetermined point and an optional point, f.sub.k is the distance between the principal surface and the point of convergence or divergence of the particular wave and ##EQU2## is the focal power of the hologram for a coherent beam of the common wavelength. In a laser beam scanner, a coherent beam of a longer wavelength is preferably used in illuminating a hologram, which may or may not be a hologram manufactured as above.
A hologram comprising a hologram recording medium having a principal surface on which interference fringes are recorded in accordance with a phase distribution .phi..sub.N defined by:
A method of manufacturing a hologram by recording interference fringes on a principal surface of a hologram recording medium, said interference fringes being formed by making a spherical-wave interfere with a phase subtract aspheric-wave produced by phase subtraction of a plurality of coherent spherical-waves, N in number, where N represents an integer of two or more.
A method of manufacturing a hologram by recording interference fringes on a principal surface of a hologram recording medium, said interference fringes being formed by making a first phase subtract aspheric-wave produced by phase subtraction of a plurality of coherent spherical-waves, N.sub.1 in number, interfere with a second phase subtract aspheric-wave produced by phase subtraction of a plurality of coherent spherical-waves, N.sub.2 in number.
A coherent beam scanner comprising a source of a coherent beam having a coherent beam axis and means for carrying at least one hologram and for moving the carried hologram relative to said coherent beam axis, said hologram comprising a hologram recording medium having a principal surface on which interference fringes are recorded in accordance with a phase distribution .phi..sub.N defined by:
A coherent beam scanner for use in combination with at least one hologram having interference fringes in accordance with a phase distribution .phi..sub.N defined by:
Dependencies are inferred from the claim text.