Elevation step scanner

Details Elevation step scanner Elevation step scanner

1983-03-03

1985-05-07

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358206, 358285, 350486, 250236, H04N 110, H04N 308, H04N 104

Patent

active

045161593

ABSTRACT:
An optical scanning device, for scanning bundles of parallel rays of light defining a field of view, includes a substantially planar disc, means for rotating the disc on its axis, and a substantially planar reflective member. The disc has a first portion which is reflective and a second portion which is transmissive. The planar reflective member is arranged in a fixed position behind the disc such that the normal to the planar reflective member subtends a nonzero angle with respect to the disc axis. As the disc is rotated, the light rays to be scanned are alternately incident upon the reflective portion of the disc and the transmissive portion of the disc. When the light rays are incident on the transmissive portion, they pass through the disc and are reflected by the fixed reflective member which is arranged behind the disc. Both the reflective portion of the disc and the fixed reflective member reflect the light rays to be scanned onto a fixed detector. Due to the different elevation angles of the disc and the fixed mirror, different bundles of parallel rays of light are scanned onto the detector.

REFERENCES:
patent: 4164753 (1979-08-01), Metcalf
patent: 4306252 (1981-12-01), Fearnside

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