Variable hologram element, and optical device using the same

Details Variable hologram element, and optical device using the same Variable hologram element, and optical device using the same

2006-11-07

2006-11-07

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S019000, C349S088000

Reexamination Certificate

active

07133172

ABSTRACT:
The invention relates to an optical element with variable optical properties, which ensures that the amount of light available is increased, and an optical device using the same. In a liquid crystal variable hologram element3, polymer layers18and liquid crystal layers19are alternately arranged between transparent substrates16and17, with liquid crystal particles20lining up in each liquid crystal layer19. When voltages are applied on transparent electrodes21and22, liquid crystal molecules23have their longitudinal directions oriented vertically with respect to the electrodes, so that the refractive index of the polymer layers18is substantially equal to that of the liquid crystal layers19, resulting in no development of hologram. When the voltages are held off, the refractive index of the polymer layers18is different from that of the liquid crystal layers19. This repetition gives rise to an interference fringe action, by which a hologram can be developed. Thus, the variable hologram element3can function as a hologram reflecting mirror.

REFERENCES:
patent: 4850682 (1989-07-01), Gerritsen
patent: 5631754 (1997-05-01), Jannson et al.
patent: 5942157 (1999-08-01), Sutherland et al.
patent: 6064506 (2000-05-01), Koops
patent: 2001/0033400 (2001-10-01), Sutherland et al.
patent: 2004/0009406 (2004-01-01), Hesselink et al.

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