Light ray cut filter

Details Light ray cut filter Light ray cut filter

2008-06-17

2008-06-17

Blackwell, Gwendolyn (Department: 1794)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S428000

Reexamination Certificate

active

07387840

ABSTRACT:
An IR-cut filter comprises a crystal plate and a multilayer film formed on one side of the crystal plate. The multilayer film is composed of first thin films made of a high refractive index material and second thin films made of a low refractive index material, which are alternately layered. The multilayer film is composed of a first layer, a second layer and a third layer sequentially from one side of the crystal plate. Film thicknesses of the layered first and second thin films differ from layer to layer so that the layers have different thicknesses. The layers have thicknesses which are sequentially increased. The multilayer film is provided with a sharpness prevention means for preventing a sharp change in transmittance within a visible region. The sharpness prevention means provides an inflection point at a wavelength band in which transmittance changes sharply.

REFERENCES:
patent: 5644124 (1997-07-01), Hamada et al.
patent: 8-275182 (1996-10-01), None
patent: 2000-314808 (2000-11-01), None
patent: 2003-29027 (2003-01-01), None

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