Holographic recording apparatus having a liquid crystal modulator including a diffuser with plural phase shift regions
February 10, 2013. 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 References 3736047 Liquid crystal display device with reflection preventive function Light-passive display device and method of manufacturing same Optical reconstruction filter for color mosaic displays Method for forming holographic optical elements free of secondary fringes Optical modulation element having two-dimensional phase type diffraction grating Liquid crystal modulator including a diffuser with plural phase shifting regions Patent #: 5225920 InventorsAssigneeApplicationNo. 015936 filed on 02/10/1993US Classes:349/2, Liquid crystal for recording or imaging on photosensitive medium349/64, Diffuser between light source and liquid crystal349/117, Compensator or retarder (i.e., not using liquid crystal cell)349/137, Antireflection layer359/9, For synthetically generating a hologram359/35Hardware for producing a hologramExaminersPrimary: Sikes, William L.Assistant: Trice, Ron Attorney, Agent or FirmForeign Patent References
International ClassG02F 001/133.5Foreign Application Priority Data1990-04-06 JPAbstractLight emitted from a coherent light source undergoes fine adjustment of its polarizing direction by a polarizing device and is directed to a liquid crystal device through a collimating optical system. The polarizing device is capable of fine-adjusting the polarizing direction in accordance with the wavelength of the incident light, thereby providing a high contrast ratio. When an image is recorded by holography using such a liquid crystal spacial light modulator, it is possible to obtain an image of high quality.Other References
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