Method for producing light scattering elements

Details Method for producing light scattering elements Method for producing light scattering elements

2005-06-07

2005-06-07

Assaf, Fayez (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S900000, C359S012000, C359S028000, C359S030000

Reexamination Certificate

active

06903851

ABSTRACT:
The present invention relates to a method for producing light-scattering elements by holographic illumination of a layer (10) of a photo-sensitive material on a support plate (1) and subsequent development of the layer (10) in order to generating a surface structure. The method is distinguished in that the illumination occurs using at least two mutually coherent luminous beams (2,3) which have passed through one or a plurality of primary diffusers (8,9) respectively were reflected at one or a plurality of primary diffusers, the luminous beams (2,3) being irradiated from different directions and being at least partially superimposed on the layer (10) while forming an interference pattern. This method permits producing diffusers having a leveled scatter profile in a simple manner.

REFERENCES:
patent: 3708217 (1973-01-01), McMahon
patent: 4602843 (1986-07-01), Glaser-Inbari
patent: 5071208 (1991-12-01), Chang
patent: 5365354 (1994-11-01), Jannson et al.
patent: 2000-214311 (2000-08-01), None
patent: 2000-241888 (2000-09-01), None
Takashi Mizobuchi, Light Diffusing Sheet And Reflection Liquid Crystal Device Using The Same, Patent Abstracts of Japan, vol. 2000, No. 11, Jan. 3, 2001 and JP 2000-214311A, Aug. 4, 2000, Toppan Printing Co. Ltd.
Masahiro Shiozawa et al, Hologram Screen And Its Production, Patent Abstracts of Japan, vol. 2000, No. 12, Jan. 3, 2001 and JP 2000-241888 A, Sep. 8, 2000, Denso Corp.; Nippon Soken Inc.

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