Light collecting device with chamber including ellipsoidal surface and spherical surface
First Claim
1. A light collecting device comprising an internally reflecting chamber for collecting light from a point source within the chamber over a solid angle of substantially 4 pi and directing all the collected light through an exit point at or adjacent the wall of the chamber, said chamber being in the form of an ellipsoidal surface extending over a solid angle of substantially 2 pi and a spherical surface extending over a solid angle of substantially 2 pi, the first conjugate focus of the ellipsoidal surface being coincident with the centre of curvature of the spherical surface and the second conjugate focus of the ellipsoidal surface being located at or adjacent the spherical surface at the centre point of the curved surface area thereof, whereby in use light from a point source located at the said first conjugate focus is directed through the said second conjugate focus, some by virtue of a single reflection at the ellipsoidal surface and the rest by virtue of an initial reflection at the spherical surface followed by a reflection at the ellipsoidal surface.
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Accused Products
Abstract
A light collecting device for flow cytometry comprises an internally reflecting chamber for collecting light from a point source within the chamber over a solid angle of substantially 4 pi and directing all the collected light through an exit point at or adjacent the wall of the chamber. The chamber comprises an ellipsoidal surface extending over a solid angle of substantially 2 pi and a spherical surface extending over a solid angle of substantially 2 pi, the firsts conjugate focus of the ellipsoidal surface being coincident with the center of curvature of the spherical surface and the second conjugate focus of the ellipsoidal surface being at the center point of the spherical surface. A capillary bore passes through the first conjugate focus to accommodate a sample stream which is illuminated by laser light to produce fluorescence at the first conjugate focus.
62 Citations
8 Claims
- 1. A light collecting device comprising an internally reflecting chamber for collecting light from a point source within the chamber over a solid angle of substantially 4 pi and directing all the collected light through an exit point at or adjacent the wall of the chamber, said chamber being in the form of an ellipsoidal surface extending over a solid angle of substantially 2 pi and a spherical surface extending over a solid angle of substantially 2 pi, the first conjugate focus of the ellipsoidal surface being coincident with the centre of curvature of the spherical surface and the second conjugate focus of the ellipsoidal surface being located at or adjacent the spherical surface at the centre point of the curved surface area thereof, whereby in use light from a point source located at the said first conjugate focus is directed through the said second conjugate focus, some by virtue of a single reflection at the ellipsoidal surface and the rest by virtue of an initial reflection at the spherical surface followed by a reflection at the ellipsoidal surface.
Specification