Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1992-07-20
1995-02-07
Ben, Loha
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359219, 250236, G02B 2608
Patent
active
053879961
ABSTRACT:
Disclosed is a scanning device (10) having a very fast raster scan and a small angle field of view. The scanning device (10) incorporates a rotating polygon scanning wheel (12) in which a beam of light (24) is reflected off of a first facet (14') of the wheel (12). A reflected beam (32) from the first facet (14') is directed through an optical subsystem that reverses the scanning direction of the beam and redirects the beam onto a second facet (14") of the scanning wheel (12). Since the subsystem optics reverses the scan of the beam, the second facet (14") scans the beam in an opposite direction to that of the first facet (14') and only the difference between the two scans remains. In a first embodiment, the optical subsystem magnifies or demagnifies the beam such that the angle of scan is enlarged or reduced, and thus the second scan will not completely cancel the first scan. Consequently, a very narrow field of view of a particular scene can be scanned very quickly. In an alternate embodiment, the size of the scan is altered by either altering the convergence or divergence of the beam between the two scanning reflections to achieve the small angle scan. In yet another embodiment, the small angle scan is achieved by substantially, but not entirely, reversing the scan direction.
REFERENCES:
patent: 3813140 (1974-05-01), Knockeart
patent: 4030806 (1977-06-01), Goshima et al.
patent: 4213157 (1980-07-01), DeBenedictis et al.
patent: 4230394 (1980-10-01), Brueggemann et al.
patent: 4388651 (1983-06-01), Sherman
patent: 5044710 (1991-09-01), Iwai et al.
"A New Type Of Infrared Scanning System", Lars Karisson, AGEMA Infrared Systems AB, Proceedings of the SPIE, vol. 805, Optical Components and Systems (1987), The Hague, Netherlands.
Fink David
Palombo Mario P.
Ben Loha
Denson-Low Wanda K.
Hughes Aircraft Company
Robbins Thomas
Sales Michael W.
LandOfFree
Method of obtaining a narrow field of view scan does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of obtaining a narrow field of view scan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of obtaining a narrow field of view scan will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1114142