Hologram duplicating device and method

2 The hologram duplicating apparatus as set forth in claim 1, wherein a light introduction block consisting of transparent optical material is attached on the surface of the third hologram recording medium where the third reference light is incident.

4 The hologram duplicating method as set forth in claim 3, wherein a light introduction block consisting of transparent optical material is attached on the surface of the third hologram recording medium where the third reference light is incident.

6 The hologram producing apparatus as set forth in claim 5, wherein the intermediate hologram producing means and the hologram producing means share a reproduction optical system for reproducing image and an exposure recording optical system for carrying out exposure recording of the reproduced image.

7 A hologram producing apparatus adapted for reproducing image using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction to produce hologram by using intermediate hologram produced by carrying out exposure recording of the reproduced image on a first hologram recording medium, the hologram producing apparatus comprising:

• hologram producing means for reproducing image of the intermediate hologram to carry out exposure recording of the reproduced image on a second hologram recording medium to thereby produce hologram,
• wherein the hologram producing means comprises, at the surface of the second hologram recording medium, diffusing means for diffusing image reproduced from the intermediate hologram in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original.

8 A hologram producing apparatus adapted for reproducing image using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction to produce hologram by using intermediate hologram produced by carrying out exposure recording of the reproduced image on a first hologram recording medium, the hologram producing apparatus comprising:

• hologram producing means for reproducing image of the intermediate hologram to carry out exposure recording of the reproduced image on a second hologram recording medium to thereby produce hologram,
• wherein hologram produced by the hologram producing means is such that angle of visibility in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original is greater than angle of visibility of holographic stereogram of the original.

9 The hologram producing apparatus as set forth in any one of claims 5 to 8, wherein the hologram is edge lit hologram.

11 The hologram producing method as set forth in claim 10,

• wherein, at the intermediate hologram producing step and the hologram producing step, a reproduction optical system for reproducing image and an exposure recording optical system for carrying out exposure recording of the reproduced image are shared.

12 A hologram producing method of reproducing image using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction to produce hologram by using intermediate hologram produced by carrying out exposure recording of the reproduced image on a first hologram recording medium, the hologram producing method including:

• a hologram producing step of reproducing image of the intermediate hologram to carry out exposure recording of the reproduced image on a second hologram recording medium to thereby produce hologram,
• wherein, at the hologram producing step, image reproduced from the intermediate hologram is diffused in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original by diffusing means disposed at the surface of the second hologram recording medium.

13 A hologram producing method of reproducing image using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction to produce hologram by using intermediate hologram produced by carrying out exposure recording of the reproduced image on a first hologram recording medium,

• the hologram producing method including
• a hologram producing step of reproducing image of the intermediate hologram to carry out exposure recording of the reproduced image on a second hologram recording medium to thereby produce hologram,
• wherein hologram produced at the hologram producing step is such that angle of visibility in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original is greater than angle of visibility of holographic stereogram of the original.

14 The hologram producing method as set forth in any one of claims 10 to 13, wherein the hologram is edge lit hologram.

15 An intermediate hologram producing apparatus adapted for producing intermediate hologram used for producing hologram using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction, the intermediate hologram producing apparatus comprising:

• intermediate hologram producing means for reproducing image of the original to carry out exposure recording of the reproduced image on a recording medium for hologram to thereby produce the intermediate hologram,
• wherein intermediate hologram produced by the intermediate hologram producing means is such that angle of visibility in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original is substantially the same as angle of visibility of holographic stereogram of the original.

16 An intermediate hologram producing method of producing intermediate hologram used for producing hologram using an original holographic stereogram having the configuration in which plural element holograms are successively arranged along parallax direction, the intermediate hologram producing method including:

• an intermediate hologram producing step of reproducing image of the original to carry out exposure recording of the reproduced image on a recording medium for hologram to thereby produce the intermediate hologram,
• wherein intermediate hologram produced at the intermediate hologram producing step is such that angle of visibility in a direction corresponding to a direction perpendicular to the parallax direction at the surface of the original is substantially the same as angle of visibility of holographic stereogram of the original.