Electronic imaging apparatus

Details Electronic imaging apparatus Electronic imaging apparatus

2008-07-22

2008-07-22

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

C359S350000, C359S360000

Reexamination Certificate

active

10776590

ABSTRACT:
The electronic imaging apparatus comprises a first optical element A having a flat surface and a surface with refracting power, chemical substance which enables to change light transmittance by chemical change according to electric quantity, a second optical element having a transparent surface and a flat surface, and an optical system having an optical component arranged so as to sandwich the chemical substance by a surface of the first optical element and a surface of the second optical element. Here the spectrum transmittance at whole range of τmin≦τ520≦τmax satisfies the following conditions when the whole transmittance of the first optical element, the chemical substance and the second optical element at the wavelength of 520 nm is τ520,in-line-formulae description="In-line Formulae" end="lead"?0.70<τ440/τ520<1.20in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.80<τ600/τ520<1.30in-line-formulae description="In-line Formulae" end="tail"?where τx (x is a number) is the transmittance at the wavelength of x nm.

REFERENCES:
patent: 4749262 (1988-06-01), Langer et al.
patent: 5231534 (1993-07-01), Kato
patent: 590113421 (1984-06-01), None
patent: 05-27093 (1993-04-01), None
patent: 11-160739 (1999-06-01), None

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