Back to results
US 4,784,487 AGranted
Flat band optical relay using apertures and simple lenses
AssigneeHewlett-Packard Company
InventorsGeorge W. Hopkins, II, Barry G. Willis
Life of this patent
Estimating the term…
Abstract
An optical relay having a pair of simple lenses and an opaque barrier defining an aperture. In a spectrometer, the optical relay is positioned between a light source and an opaque barrier defining a slit to focus light of a reference wavelength w.sub.r onto the slit. The location of the aperture and the choice of w.sub.r are selected so that the flux of light through the slit is substantially flat as a function of wavelength.
Claims11
An optical apparatus for focussing light from a light source onto a slit, said optical relay comprising:
- a first simple lens;
- a second simple lens through which light from the light source passes, after passing through the first lens;
- and
- a first opaque barrier defining a first aperture through which light from the light source passes after passing through the first lens, the distance of the first opaque barrier from the first lens being selected to produce through the slit a flux of light that is substantially flat as a function of wavelength over a range of wavelengths of interest.
1 more element
Dependencies are inferred from the claim text.