Double pass optical system for raster scanners

Details Double pass optical system for raster scanners Double pass optical system for raster scanners

1980-09-29

1983-08-09

Corbin, John K.

G02B 2717

Patent

active

043975216

ABSTRACT:
A raster scanner with laser for generating a scanning beam and compact folded optical system for transmitting the beam to the object to be scanned. The optical system includes a first mirror for guiding the laser beam forward along a downwardly inclined slope to the modulator, a second mirror below the modulator for intercepting the beam from the modulator and folding the intercepted beam to guide the beam backwards along a horizontal plane to a third mirror which folds the beam and guides the beam forward along an upwardly inclined slope against the mirrored facets of a rotating polygon, the polygon scanning the beam through a preset scan arc and returning the beam via a focusing lens to the third mirror, the third mirror folding the scan beam and guiding the scan beam forward, and a fourth mirror for intercepting the scan beam and guiding the beam to the object to be scanned.

REFERENCES:
patent: Re29067 (1976-12-01), Watson
patent: 3752558 (1973-08-01), Lloyd
patent: 3898627 (1975-08-01), Hooker et al.
patent: 4054361 (1977-10-01), Noguchi
patent: 4054928 (1977-10-01), Butler et al.
patent: 4058828 (1977-11-01), Ladd
patent: 4179183 (1979-12-01), Tateoka et al.
patent: 4284994 (1981-08-01), Radl

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