| 摘要 |
An optical scanner for imaging lines in an object plane (10) onto a linear array (18) in a focal plane (16) either continuously or discretely and comprising a set of four mutually perpendicularly oriented plane corner mirrors (28, 30, 32, 34) providing a reflecting path (L1, L2, L3, L4, L5) describing a parallelogram and a plane parallel scanning mirror (22) with a front and back reflecting surface (Mo, Moo) located mid-way between the first and fourth corner mirrors (28, 34) and oriented so that in the mid scan position (45 DEG ) it is parallel to the first corner mirror (28) and therefore perpendicular to the fourth corner mirror (34). As the scan mirror (22) rotates, rays (Lo, Li) incident from a plurality of lines (15, 17) in the object plane (10) are selectively directed through the optical system arriving at a common intersection (Poo) on the back surface (Moo) of the scanning mirror where the rays are colinearly directed (Li) toward a lens (14) and then imaged onto the linear array (18) in the focal plane (16). A set of compensating mirrors (M5, M6, M7, M8) may be introduced just before the imaging lens (14) to compensate for a small and generally negligible path difference DELTA l between the axial (Lo) and marginal (Li) rays.
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