Patent ID: 7259899

Claim:
A narrow angle hologram device comprising: a photosensitive film; and a 3-dimensional holographic image of an object recorded in the photosensitive film without a longitudinal slit in an object beam light path, the 3-dimensional holographic image having a narrow angle of reconstruction with the narrow angle being defined as a predefined angle that falls within a range of −30 degrees to +30 degrees, inclusive, relative to a perpendicular line to a surface of the photosensitive film, a recorded angle of the object in the photosensitive film being less than or equal to 30 degrees wherein the recorded angle is defined as an angle between an optical axis of a reference beam and a line perpendicular to a recording surface of the photosensitive film; wherein: the 3-dimensional holographic image is recreated towards an observer when a light from a white light source illuminates the photosensitive film at the narrow angle; and a recreation angle, between an optical axis of the illumination light that hits a common point on the surface of the photosensitive film and a line from the common point to a center of the recreated image of the object, is less than or equal to 30 degrees.