One step rainbow holography
Patent 4925260 Issued on May 15, 1990. Estimated Expiration Date: 
November 18, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 18, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMulti-color holograms with white-light illumination Patent #: 4235505 InventorsApplicationNo. 122360 filed on 11/18/1987US Classes:359/10, Using modulated or plural reference beams359/31, Focused image holography359/35Hardware for producing a hologramExaminersPrimary: Arnold, Bruce Y.Attorney, Agent or FirmInternational ClassG03H 001/10AbstractImproved optical holographic apparatuses are disclosed for making white light viewable rainbow holograms in one step utilizing concave mirror optics. On-axis and off-axis configurations are presented for holography of real objects and for reduced image holography of a real image projection from a laser transmission hologram. An optical apparatus and curved recording device are devised to reduce and/or eliminate certain aberrations introudced by the concave mirror. To yield a wide holographic field of view at low cost, small diameter mirrors are employed in two alternative devices for replacing a single concave mirror in the various embodiments. Two methods are then presented to obtain reduced image size one-step rainbow holograms from a full size object or holographic image. Finally, a method is given for specifying the radius of curvature and minimum effective aperture of a concave mirror system in one step rainbow holography that maintains image aberrations at acceptable levels and yield the desired field of view.Other References
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