Patent ID: 6366383
Filing Date: 2002-04-02
Classification: G02B

Abstract:
Relay optics for a deflection system in which two scanning devices are provided, each of which changes the angle of a light bundle from a location predetermined separately for each scanning device in a predetermined deflection plane within a predetermined deflection area, said relay optics comprising:a first optical system which focuses a parallel light bundle proceeding from the predetermined location for the first scanning device onto a focal surface; and a second optical system which parallelizes the light bundle coming from said focal surface and deflects it to the predetermined location of the second scanning device; said first optical system as well as the second optical system being formed by one individual optical system; a mirror surface being provided which directs at least once the light bundle traveling from the predetermined location of the first scanning device through said individual optical system which initially acts as a first optical system, said mirror surface then directing said light bundle back to said individual optical system which then acts as a second optical system; said individual optical system having an optical axis which coincides with respect to position and direction with the central normal of a connecting straight line between the predetermined locations of the first scanning device and second scanning device; the shape and position of the mirror surface being realized in accordance with conditions that two vectors, the direction vector of the light bundle and the surface normal of the mirror surface, each projected in the deflection plane of the first scanning device, are identical with respect to direction for every point of incidence of the light bundle on the mirror surface given by the deflection of the first scanning device; the path of the light bundle running toward the focal surface, with the optical axis of the individual optical system as axis of symmetry, being mirror-symmetric to the path of the light bundle running back from said focal surface.