Dichroic mirror, fluorescence filter set, and fluoroscopy...

Details Dichroic mirror, fluorescence filter set, and fluoroscopy... Dichroic mirror, fluorescence filter set, and fluoroscopy...

2007-11-20

2007-11-20

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Compound lens system

Microscope

C359S634000, C359S580000, C359S588000, C359S589000, C359S584000, C359S585000, C359S586000, C359S587000

Reexamination Certificate

active

11184814

ABSTRACT:
The invention provides a dichroic mirror having a transmission characteristic in which a step due to splitting of P-polarized and S-polarized light can be reduced and having a fluorescence-transmitting band extending to long wavelengths. The invention also provides a fluorescence filter set that can be constructed of environmentally conscious glass materials that do no use harmful substances, such as lead, and a fluoroscopy apparatus including such a fluorescence filter set. The dichroic mirror comprises a transparent substrate and a dielectric multilayer film formed by alternately laminating high-refractive-index layers and low-refractive-index layers on the transparent substrate. The dielectric multilayer film includes from 50 to 150 alternately laminated high-refractive-index layers and low-refractive-index layers each having an optical film thickness from 1.5λ0/4 to 2.5λ0/4, where λ0is a design wavelength, and the dichroic mirror has a reflection band located at wavelengths shorter than the design wavelength.

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