Dichroic mirror, fluorescence filter set, and fluoroscopy apparatus
US7298550B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2005 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Aug 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/6471
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 λ0 is a design wavelength, and the dichroic mirror has a reflection band located at wavelengths shorter than the design wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.