Projection screen and its manufacturing method

Details Projection screen and its manufacturing method Projection screen and its manufacturing method

2007-01-02

2007-01-02

Perkey, W. B. (Department: 2851)

Optical: systems and elements

Projection screen

Unitary sheet comprising plural reflecting areas

C359S454000, C359S449000

Reexamination Certificate

active

11325929

ABSTRACT:
The invention provides a projection screen, wherein clear images can be obtained without being influenced by projection environments, the flexibility can be obtained, and its manufacturing cost can be reduced and its manufacturing method. An optical multilayer film is formed on a transparent substrate by alternately layering metal films and dielectric films by using spattering. This multilayer film has the high reflection characteristics in relation to three primary colors wavelength bands lights, and has the high absorption characteristics in relation to lights other than the three primary colors wavelength bands lights. Therefore, the white level and the black level of images can be raised. Further, in terms of the optical multilayer film, as the film thickness dependence of the reflectance change becomes smaller and the incidence angle dependence of reflectance change becomes smaller, a wide visual field angle can be obtained.

REFERENCES:
patent: 4006965 (1977-02-01), Takada et al.
patent: 6707605 (2004-03-01), Sekiguchi
patent: 6724529 (2004-04-01), Sinkoff
patent: 2004/0061935 (2004-04-01), Ohsako et al.
patent: 2004/0150883 (2004-08-01), Shimoda et al.
patent: 2005/0078366 (2005-04-01), Takahashi et al.

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