NON-AXIAL AND CONFOCAL ZOOM REFLECTION OPTICAL SYSTEM

摘要

PURPOSE: To continuously vary the focal distance of an entire optical system by attaining the combination of a large number of reflection surfaces, introducing a large number of variable parameters, using the combination of secondary curved surfaces with point focuses, and changing an angle made by the symmetric axes of the front and rear surfaces with confocal relation. ;CONSTITUTION: A first surface S1 as an incident plane is constituted of a rotational parabolic surface, second surface S2 is constituted of the outside reflection surface of a rotational elliptic surface, and third surface S3 is constituted of the inside reflection surface of the rotational elliptic surface. The positions of a light exit focus F1' of the first surface S1 and an incident focus F2 of the second surface S2, and the positions of a light exit focus F2' of the second surface S2 and an incident focus F3 of the third surface S3 are in the confocal relation in the same positions. Moreover, rotational symmetric axes F1-F1', F2-F2', and F3-F3' of each surface S1, S2, and S3 are arranged so as not be co-axial but be non-axial. Angles β21 and β32 made by each rotational symmetric axes F1-F1', F2-F2', and F3-F3', and an angle Bi made by the F3-F3' and an image surface are changed, so that the focal distance of the optical system can be continuously changed.;COPYRIGHT: (C)1995,JPO