Optical: systems and elements – Holographic system or element – Copying by holographic means
Reexamination Certificate
2007-05-08
2007-05-08
Chang, Audrey (Department: 2872)
Optical: systems and elements
Holographic system or element
Copying by holographic means
C359S015000, C359S022000, C359S024000, C359S032000
Reexamination Certificate
active
09116589
ABSTRACT:
A method of fabricating a hologram having a pattern made up of pixels in which a photosensitive material for forming a hologram is stacked on either a reflection-type hologram or a transmission type hologram. According to one aspect of the invention, the photosensitive material is stacked on a reflection-type relief hologram and reconstructing illumination light of a given wavelength is struck on the reflection-type relief hologram through the photosensitive material, so that interference fringes produced by interference of the light diffracted from the reflection type relief hologram and the incident light are recorded in the photosensitive material. According to another aspect of the invention, the photosensitive material is stacked on a transmission-type hologram, and reconstructing illumination light of a given wavelength is struck on a side of the transmission type hologram that is not opposite to the volume hologram photosensitive material, so that interference fringes produced by interference of light diffracted from the transmission type hologram and reference light incident on the photosensitive material are recorded in the photosensitive material. According to a third aspect of the invention, the photosensitive material is stacked on a transmission type hologram, and reconstructing illumination light of a given wavelength is struck on a side of the transmission type hologram that is not opposite to the photosensitive material, so that interference fringes produced by interference of light diffracted from the transmission type hologram and zero-order transmitted light are recorded in the photosensitive material, and a reflecting layer is provided on a back side of the photosensitive material.
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Hotta Tsuyoshi
Kuwabara Yuko
Nishikawa Shingo
Segawa Toshikazu
Ueda Kenji
Chang Audrey
Dai Nippon Printing Co. Ltd.
Sughrue & Mion, PLLC
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