Hologram optical element, fabrication method thereof, and...

Details Hologram optical element, fabrication method thereof, and... Hologram optical element, fabrication method thereof, and...

2011-08-16

2011-08-16

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Holographic system or element

Head up display

C359S015000, C345S007000

Reexamination Certificate

active

07999982

ABSTRACT:
A volume-phase reflection hologram optical element is fabricated by exposing a hologram photosensitive material to two coherent light beams. One exposure light beam has an axis-asymmetric wavefront, and the other exposure light beam has focus points different in the optical axis direction (Z-direction) between on a plane (ZX-plane) including one of two directions (X- and Y-directions) mutually perpendicular on a sectional plane perpendicular to that light beam and on a plane (YZ-plane) including the other of those two directions. Thus, an image display apparatus is realized in which at the time of reproduction, the component of a predetermined wavelength of the image light diffraction-reflected by the hologram optical element is focused at positions different in the optical axis direction between on the ZX-plane and on the YZ-plane, offering different image viewing characteristics between in the X- and Y-directions.

REFERENCES:
patent: 5847878 (1998-12-01), Togino
patent: 7072085 (2006-07-01), Ouchi
patent: 2006/0120247 (2006-06-01), Noda et al.
patent: 2007/0019264 (2007-01-01), Tanijiri et al.
patent: 2001-264682 (2001-09-01), None
patent: 2004-61731 (2004-02-01), None

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