Patent ID: 7247874

Claim:
Device for detecting information which is contained in a phosphor layer, comprising: multiple individual radiation sources for emitting stimulation light incident upon the phosphor layer along a stimulation line and suitable for stimulating emission light in the phosphor layer, a detector for detecting the emission light which is stimulated in the phosphor layer, and an elongated concave mirror for focusing the stimulation light emitted by the individual radiation sources onto the phosphor layer, wherein the concave mirror has an optical axis in a plane of a cross-section of the concave mirror and said optical axis cuts the concave mirror in a vertex (S), wherein the radiation sources are tilted by a tilt angle (ω) around the vertex (S) relative to the optical axis of the concave mirror, and wherein there is a distance (d) between the radiation sources and/or the stimulation line on the one hand and the vertex (S) on the other hand, said distance (d) running along said optical axis in the plane of the cross-section of the concave mirror and satisfying the relationship d=R cos 2 ω, where R designates a radius of curvature of the concave mirror.