Optical material, and, optical element, optical system and...

Details Optical material, and, optical element, optical system and... Optical material, and, optical element, optical system and...

2005-06-28

2005-06-28

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

C359S558000, C359S576000

Reexamination Certificate

active

06912092

ABSTRACT:
An optical element of which diffraction efficiency hardly varies with wavelength is provided by using an optical material satisfying the conditions that nd>−6.667×10−3vd+1.70 and θg,F≦−2×10−3νd+0.59 where ndis a refractive index at d-line, νdis an Abbe number at the d-line, and θg,Fis a second order dispersion at d-line, whereby diffraction efficiency is improved in any working visible wavelength region and more precise chromatic aberration correction is obtained.

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