Infrared ray cut filter and methods for manufacturing the same

Details Infrared ray cut filter and methods for manufacturing the same Infrared ray cut filter and methods for manufacturing the same

2007-01-02

2007-01-02

Zimmerman, John J. (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S689000, C428S701000, C428S702000, C428S428000, C428S432000

Reexamination Certificate

active

10773671

ABSTRACT:
A reflective-type infrared ray cut filter and associated manufacturing method wherein the time and cost of manufacture are reduced and manufacturing efficiency is improved are provided. In the infrared ray cut filter10comprising a multilayer membrane200composed of no less than 16 but no more than 32 layers of a high-refractive index thin membrane210and a low-refractive index thin membrane220laminated in an alternating fashion and formed on a glass substrate100, the first layer from the side of the glass substrate100is a high-refractive index thin membrane210and the last layer is a low-refractive index thin membrane220, and where the design wavelength is deemed λ, the first and second layers are formed to have an optical thickness of no less than λ/4, the third layer through a prescribed layer are formed to have an optical thickness of no more than λ/4, the layers between the prescribed layer and the last layer are formed to have an optical thickness of no less than λ/4, and the last layer is formed to have an optical thickness of no more than λ/4.

REFERENCES:
patent: 6391400 (2002-05-01), Russell et al.
patent: 2000-314808 (2000-11-01), None

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