Patent Number: 6,426,812

Title: Hologram color filter, and its fabrication method

Abstract: The present invention provides a hologram color filter having a drasticallydecreased dependence of diffraction efficiency on wavelength and wellcorrected for a color balance among the three colors R, G and B comprisingan array of converging element holograms 5', each of which enables whitelight incident at a given angle .theta. with respect to a normal line of ahologram recorded surface thereof to be spectroscopically separated bywavelength dispersion in a direction substantially along the hologramrecorded surface, wherein the converging element holograms 5' have each aplurality of hologram pieces 51 and 52 superposed on each other ormulti-recorded therein, which, with respect to the white light 3 incidentat the given angle .theta., have substantially identical spatialwavelength distributions of wavelength dispersion and different peakwavelengths of diffraction efficiency.

Inventors: Ichikawa; Nobuhiko (Tokyo, JP), Hotta; Tsuyoshi (Tokyo, JP), Ueda; Kenji (Tokyo, JP)

Assignee:

International Classification: G02B 5/32 (20060101); G02B 27/32 (20060101); G02B 27/62 (20060101); G02B 7/00 (20060101); G03H 1/26 (20060101); G02B 005/32 (); G03H 001/26 (); G03H 001/28 (); G03H 001/30 (); G02F 001/133 ()

Expiration Date: 07/30/2014