Optical scanning device

Details Optical scanning device Optical scanning device

1985-04-18

1986-12-30

Corbin, John K.

G02B 2610

Patent

active

046325034

ABSTRACT:
In an optical scanning device in which the active scanning means comprises a rotating polygon provided with a plurality of reflecting facets, the so-called optical invariant ##EQU1## wherein .phi. is the aperture of the scanning device, .alpha. is the field angle of the scan, the NETD is the so-called Noise Equivalent Difference Temperature, is increased by passing the beam path against the polygon so as to be reflected therefrom a multiple of times, and therein with substantially complete tracking of the facets while substantially filling the same completely over the full extension of the facets, with the exception of that facet located nearest the beam detector. This is effected with the aid of stationary beam-deflecting optical means which cause the mutual reproductions between facets with reflection of substantially full extension in the rotary direction of the polygon to take place against diametrically opposed facets at a magnification of approximately -1.

REFERENCES:
patent: 3973826 (1976-08-01), Lobb
patent: 4030806 (1977-06-01), Goshima et al.
patent: 4478482 (1984-10-01), Koester

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