Apparatus for removing the scanning error due to an error in par

Details Apparatus for removing the scanning error due to an error in par Apparatus for removing the scanning error due to an error in par

1976-01-29

1977-10-18

Henry, Jon W.

350285, G02B 2717

Patent

active

040543609

ABSTRACT:
An improved method and apparatus for removing the scanning error due to imperfect parallelism of a rotary polyhedral mirror is disclosed. An incident beam of light initially deflected by the rotary polyhedral mirror is directed along an optical path which brings it back into incidence on the same deflection point on the mirror. The double deflection causes the second reflected beam to travel a path which is vertically independent of the error in parallelism, while at the same time not interfering with the horizontal scanning of the second reflected beam.

REFERENCES:
patent: 3212100 (1965-10-01), Buck
patent: 3750189 (1973-07-01), Fleischer
patent: 3771850 (1973-11-01), Casler
patent: 3865465 (1975-02-01), Tatuoka et al.
patent: 3897132 (1975-07-01), Meeussen et al.

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