Scanning devices

Details Scanning devices Scanning devices

1974-12-26

1976-08-10

Corbin, John K.

Telegraphy

Systems

Printing

178 76, G02B 2717, H04N 300

Patent

active

039738264

ABSTRACT:
A mirror drum type of light beam, or other radiation beam, scanning device comprising a rotating mirror drum and an arcuate set of optical, or like, elements arranged coaxially with the mirror drum. An incident beam, directed upon the mirror drum strikes each mirror face in turn as the drum rotates. Each mirror face sweeps the reflected beam across each optical element in turn of the arcuate set. Each optical element is adapted to return the beam to the same mirror face whence it came. The same beam is thereby deflected a second time by the same mirror face to produce an angular rate of rotation of the final reflected beam of four times the angular rate of rotation of the mirror drum.
In a modification, a second mirror drum, with convex mirror faces, sweeps the beam over a concave mirror as a pre-scanner, so that the beam follows the reflecting mirror face of the main mirror drum, in rotation. In this modification, the main and second mirror drums may be coaxial and the arcuate set of discrete optical elements replaced by a single element extending over the beam-acceptance arc.

REFERENCES:
patent: 2070460 (1937-02-01), Traub
patent: 2139869 (1938-12-01), Traub

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